JP4938066B2 - Wiring route inspection system - Google Patents

Description

  The present invention mainly relates to a wiring route inspection system for inspecting a route of power supply wiring stretched around a building such as an apartment house.

  In buildings such as apartment houses, watt-hour meters for measuring the amount of power used in each house are often installed in one place. In a building such as an apartment house, if the power supply wiring is mistakenly wired, the watt hour meter will measure a value different from the amount of power used, or the power consumption of one residence and that of another residence. , Or measure the amount of power in one residence and the amount of power in another residence in duplicate. As a result, incorrect billing of the power usage fee occurs.

  For this reason, a construction contractor or a power supplier (hereinafter sometimes referred to as an inspector) of a building such as an apartment house has a power supply wiring stretched around the building so as not to cause such an erroneous charge. Is checking the route. That is, the inspector checks whether or not the power supply wiring to be inspected is wired without error. In this inspection, various methods are used. Recently, in order to simplify the inspection, a method using the following system (hereinafter referred to as “wiring route inspection system”) has been developed. A method using this wiring route inspection system has been tried (for example, see Non-Patent Document 1).

<Details of wiring route inspection system>
The wiring route inspection system disclosed in Non-Patent Document 1 is a measuring instrument connection / wiring inspection device. Hereinafter, in the order of “wrong wiring example of power supply wiring”, “configuration of wiring route inspection system”, “first usage example of wiring route inspection system”, and “second usage example of wiring route inspection system”. The details will be described.

(Incorrect power supply wiring example)
Hereinafter, an incorrect wiring example of the power supply wiring will be described with reference to FIGS. 13A and 13B and FIG. FIGS. 13A and 13B are diagrams for explaining a connection error. FIG. 13 (A) shows a state in which the power supply wiring Wi is correctly wired with respect to the watt hour meter Wh of each house, and FIG. 13 (B) shows the state of the watt hour meter Wh of each house. Thus, the power supply wiring Wi is shown in a wrong state.

  The watt hour meter Wh is provided with 1S, 2S, and 3S as connection terminals on the power source side, and 1L, 2L, and 3L as connection terminals on the load side. Further, the power supply wiring Wi on the power supply side and the load side are each composed of A line, C line, and B line. When there is no connection error, as shown in FIG. 13A, the power supply side connection terminals 1S, 2S, and 3S are connected to the power supply side A line, C line, and B line, respectively, and the load The connection terminals 1L, 2L, and 3L on the side are connected to the A line, the C line, and the B line on the load side, respectively. On the other hand, when there is a connection error, as shown in FIG. 13B, the connection terminals 1S, 2S, and 3S to be connected to the A line, C line, and B line on the power supply side are respectively connected to the load side. The connection terminals 1L, 2L, and 3L that are connected to the A line, the C line, and the B line and that are to be connected to the load side A line, the C line, and the B line are respectively connected to the power source side A line and C. Line and B line. Here, the case where the electrical system is a 100/200 volt (hereinafter referred to as “V”) type single-phase three-wire system is described as an example. In this power supply method, the voltage between the A line and the B line is 200 V, the voltage between the A line and the C line is 100 V, and the voltage between the B line and the C line is The voltage is 100V.

  As shown in FIG. 13B, when there is a connection error, the watt-hour meter Wh measures a value different from the used power amount.

  FIG. 14 is a diagram for explaining a wiring error. FIG. 14 shows that a watt-hour meter Wh101 for room 101, a watt-hour meter Wh102 for room 102, and a watt-hour meter Wh103 for room 103 are installed in one accumulator. The state in which the watt hour meter Wh102 and the watt hour meter Wh103 are mistakenly wired, that is, the watt hour meter Wh102 for the No. 102 room is connected to the power supply wiring Wi for the No. 103 room and A state in which the power supply wiring Wi for the number room is connected is shown.

  As shown in FIG. 14, if there is a wiring error, the power amount of the residence where the watt hour meter Wh is present is measured with the power amount of another residence being misunderstood.

(Configuration of wiring route inspection system)
The inspector uses, for example, the following wiring path inspection system in order to find out such erroneous wiring.

  Hereinafter, the configuration of the wiring path inspection system will be described with reference to FIGS. 15A and 15B, FIGS. 16, 17, 18 </ b> A and 18 </ b> B, and FIG. 19. FIGS. 15A and 15B are diagrams each showing a configuration of a wiring route inspection system. FIG. 15A shows the external configuration of the transmitter used for the wiring path inspection system, and FIG. 15B shows the external configuration of the receiver used for the wiring path inspection system.

  As is well known, the transmitter 10 shown in FIG. 15A includes a power switch 12 that is selected by the operator to turn on or off the power, an input key 14 for inputting an arbitrary code by the operator, and information. A display (LCD) 16 for display and a plug PL inserted into an outlet serving as a terminal end of the power supply wiring Wi are provided. The transmitter 10 includes a dummy load inside. The dummy load is electrically connected to the power supply wiring Wi through a switch such as a triac and a plug PL. The transmitter 10 can also be electrically connected to the power supply wiring Wi via the cable CB including the socket SC into which the plug PL is inserted and the voltage terminal clips cl1 and cl2.

  In a state where the transmitter 10 is electrically connected to the power supply wiring Wi, the operator inputs an arbitrary code (for example, a room number) including a plurality of character strings from the input key 14. At this time, the transmitter 10 synchronizes with the commercial frequency of 50 Hz or 60 Hz, and intermittently switches the internal switch with a switching pattern corresponding to the character of the code input by the operator, thereby causing the dummy flowing through the dummy load. Encode the load current. The oscillator 10 outputs the encoded dummy load current to the power supply wiring Wi as a signal used for inspection (hereinafter referred to as “inspection signal”). This check signal is generated as a current signal of a number of bit sections corresponding to characters, with one period of the current of the check signal as one bit section. Note that one cycle of the current of the inspection signal is given by the reciprocal of the commercial frequency. For example, when the commercial frequency is 50 Hz, one cycle is 20 milliseconds.

  16 and 17 show conventional examples of the current waveform of the inspection signal. FIG. 16 shows an example of the current waveform pattern of the inspection signal representing one character (here, the character “7”). One code of this check signal is a period of one cycle of a current signal supplied from a commercial power source as a 1-bit section, and character “7” is a 1-bit start bit (S) section and an 8-bit section. It is comprised with the combination with the character bit area expressed by the binary number of. FIG. 17 shows an example of a current waveform pattern of an inspection signal representing a 5-digit code “77777” in which each digit of the character string is a character “7”. CH1 shown in FIG. 17 indicates a current waveform pattern of the inspection signal “77777”, and CH2 shown in FIG. Note that CH1 and CH2 below the arrow shown in FIG. 17 indicate waveforms that are enlarged and normalized by one character of CH1 and CH2 above the arrow.

  As is well known, the receiver 60 shown in FIG. 15B includes a power switch 62 that is selected to be turned on or off by the operator, an input key 64 that is operated by the operator, and a display that displays information ( LCD) 66, current transformers CT1 and CT3 as connection terminals electrically connected to the power supply wiring Wi, and voltage terminal clips CL1, CL2, and CL3. The current transformers CT1 and CT3 convert a large current into a small current (for example, 100 amperes into 5 amperes), and measure the current flowing through the power supply wiring Wi. In addition, the structure of current transformer CT1 and CT3 is shown to FIG. 18 (A) and (B) and FIG. As shown in FIGS. 18A and 18B, the current transformers CT1 and CT3 include a push button CTp and a clamp CTc. As is well known, the clamp CTc is formed of a conductor having a certain magnetic permeability, and is opened by the operator pressing the push button CTp as shown in FIG. 18 (A). As shown, the operator releases the push button CTp to close it. The operator closes the clamp CTc while passing the power supply wiring Wi through the clamp CTc. In this way, the current transformers CT1 and CT3 are respectively connected to the A line and the B line of the power supply wiring Wi connected to the power supply side of the watt hour meter Wh. As shown in FIG. 19, the clamp CTc is wound with a wire wi. When a current I1 flows through the power supply wiring Wi passed through the clamp CTc, a voltage E0 is generated at both ends of the wire wi, and the wire wi A current I2 flows. Further, the voltage terminal clips CL1, CL2, and CL3 are respectively connected to the A line, the B line, and the C line of the power supply wiring Wi that is connected to the load side of the watt hour meter Wh. Note that the operator of the transmitter 10 and the operator of the receiver 60 may be the same person or different persons. Here, it is assumed that the operator of the transmitter 10 and the operator of the receiver 60 are the same person.

  The receiver 60 connected to the power supply wiring Wi is in a reception waiting state. The inspection signal output from the transmitter 10 is input to the receiver 60 via the power supply wiring Wi. At this time, based on the current waveform pattern of the inspection signal, the receiver 60 converts the inspection signal into a corresponding code (that is, an arbitrary character string composed of a plurality of character strings input from the input key 14 of the transmitter 10 by the operator). Code (for example, room number)) and displayed on the display 66.

  Such a wiring route inspection system using the transmitter 10 and the receiver 60 transmits an inspection signal including an arbitrary code such as a room number transmitted by the transmitter 10 via a power supply wiring Wi laid around the building. The receiver 60 is made to acquire. At this time, if there is no error in the path of the power supply wiring Wi, the receiver 60 can display the same code as the code output from the transmitter 10 on the display 66. However, if there is an error in the path of the power supply wiring Wi, the receiver 60 displays a code different from the code output from the transmitter 10 on the display 66. Thereby, the wiring route inspection system can detect the presence or absence of incorrect wiring.

(First use example of wiring route inspection system)
Hereinafter, a first usage example of the wiring route inspection system disclosed in Non-Patent Document 1 will be described with reference to FIGS. FIGS. 20A and 20B are diagrams illustrating examples of use when determining the presence or absence of a connection error. FIG. 20A shows an example when the connection is correct, that is, when there is no connection error, and FIG. 20B shows an example when the connection is incorrect, that is, when there is a connection error.

  When determining the presence or absence of a connection error using the wiring path inspection system, the operator takes the receiver 60 and the transmitter 10 and goes to the place where the watt hour meter Wh is installed. In addition, when the building is a collective housing, the watt hour meter Wh of each residence is often installed in one collector.

  The operator connects the current transformers CT1 and CT3 of the receiver 60 to the A line and the B line of the power supply wiring Wi on the power supply side, respectively, and the voltage terminal clips CL1, CL2, and CL3 to the power supply wiring on the load side, respectively. By connecting to the A line, B line, and C line of Wi, the receiver 60 is connected to the power supply wiring Wi connected to the watt hour meter Wh.

  Next, the operator inserts the plug PL of the transmitter 10 into the socket SC of the cable CB, and then connects the voltage terminal clips cl1 and cl2 of the cable CB to the A line and C line of the power supply wiring Wi on the load side, respectively. . Thereby, the transmitter 10 is connected to the power supply wiring Wi connected to the load side of the watt hour meter Wh.

  The operator connects the voltage terminal clips cl1 and cl2 of the cable CB to the A line and C line of the power supply wiring Wi on the load side, respectively, and then selects an arbitrary code consisting of a plurality of character strings from the input key 14 of the transmitter 10 ( For example, the room number) is entered. When a code is input by the operator, the transmitter 10 generates an inspection signal in response to the code as described above. The transmitter 10 sequentially outputs the generated inspection signal one character at a time to the A line and the C line of the power supply wiring Wi on the load side via the voltage terminal clips cl1 and cl2 of the cable CB.

  The receiver 60 connected to the power supply wiring Wi is in a reception waiting state. The receiver 60 receives the inspection signal output from the transmitter 10 via the power supply wiring Wi. The receiver 60 converts the inspection signal into a corresponding code on the display 66 based on the current waveform pattern of the inspection signal.

  As shown in FIG. 20A, when the connection is correct, that is, when there is no connection error, the receiver 60 displays the same code as the code transmitted by the transmitter 10 on the display 66.

  On the other hand, as shown in FIG. 20B, when the connection is incorrect, that is, when there is a connection error, the receiver 60 cannot receive the code transmitted by the transmitter 10. Therefore, nothing is displayed on the display 66.

  Therefore, the operator can determine whether or not there is a connection error by checking whether or not the code transmitted by the transmitter 10 matches the code displayed on the display 66 of the receiver 60. That is, the operator determines that there is no error in the connection when the code transmitted from the transmitter 10 and the code displayed on the display 66 of the receiver 60 match, and in other cases, that is, the transmitter. When the code transmitted from 10 does not match the code displayed on the display 66 of the receiver 60, or when the receiver 60 does not receive the code transmitted from the transmitter 10, it is determined that there is an error in the connection. Can do.

(Second usage example of wiring route inspection system)
Hereinafter, a second usage example of the wiring route inspection system disclosed in Non-Patent Document 1 will be described with reference to FIGS. 21 and 22. FIG. 21 and FIG. 22 are diagrams showing examples of use when determining the presence or absence of a wiring error. FIG. 21 shows an outline of the connection between the transmitter 10 and the power supply wiring Wi and the connection between the receiver 60 and the power supply wiring Wi. FIG. 22 shows the connection between the transmitter 10 and the power supply wiring Wi and the receiver 60. And details of the connection between the power supply wiring Wi.

  When determining the presence or absence of a wiring error using the wiring route inspection system, first, the operator goes to the place where the watt hour meter Wh is installed with the receiver 60. In the following description, it is assumed that the building is a collective housing and the watt-hour meter Wh of each residence is installed in one collector.

  The operator connects the current transformers CT1 and CT3 of the receiver 60 to the A line and the B line of the power supply wiring Wi on the power supply side, respectively, and the voltage terminal clips CL1, CL2, and CL3 to the power supply wiring on the load side, respectively. Connect to Wi A line, C line, and B line. Thereby, the receiver 60 is connected to the power supply wiring Wi connected to the watt-hour meter Wh corresponding to the residence to be inspected. The receiver 60 connected to the power supply wiring Wi is in a reception waiting state.

  Next, the operator takes the transmitter 10 and goes to the place where the outlet CN is installed in the residence to be inspected. Then, the operator inserts the plug PL of the transmitter 10 into the outlet CN. Thereby, the transmitter 10 is connected to the power supply wiring Wi extending around the building. The outlet CN is connected to the load side terminal 1L of the watt hour meter Wh by the power supply wiring Wi through the distribution board B in which the main circuit breaker and the branch wiring circuit breaker are collectively arranged at one place. It is connected to 2L and 3L.

  As a result, as shown in FIGS. 21 and 22, the transmitter 10 is electrically connected to the power supply wiring Wi through the plug PL and the outlet CN, and the receiver 60 includes the current transformers CT1 and CT3. Is connected to the A line and the B line of the power source wiring Wi on the power source side of the watt hour meter Wh, and the power side wiring Wi on the load side of the watt hour meter Wh via the voltage terminal clips CL1, CL2, and CL3. Connected to A line, C line, and B line.

  Next, the operator inputs an arbitrary code (for example, a room number) composed of a plurality of character strings from the input key 14 of the transmitter 10. When the code is input by the operator, the transmitter 10 generates the inspection signal in response to the code as described above, and the generated inspection signal is transmitted to the voltage terminal clips cl1 and cl2 of the cable CB. And sequentially output one character at a time to the A line and C line of the power supply wiring Wi on the load side.

  When there is no wiring error, the watt-hour meter Wh is correctly connected to the corresponding residence. When the receiver 60 receives the inspection signal output from the transmitter 10 via the power supply wiring Wi, the receiver 60 converts the inspection signal into a corresponding code based on the current waveform pattern of the inspection signal, and the transmitter 10 outputs it. The same code as the selected code is displayed on the display 66.

  On the other hand, when there is a wiring error, the watt-hour meter Wh is connected to a residence different from the corresponding residence, or is connected to a plurality of residences. In this case, the receiver 60 displays a code different from the code output from the transmitter 10 on the display 66 or displays the code output from the plurality of transmitters 10 on the display 66 in an overlapping manner. Thus, the operator can select the room in which the transmitter 10 outputs the code based on the code (for example, the room number) displayed on the display 66 of the receiver 60 and the power supply wiring Wi from which the receiver 60 has acquired the code. The correspondence relationship can be grasped.

  Therefore, the operator can easily specify the route of the power supply wiring by checking whether or not the code transmitted from the transmitter 10 matches the code displayed on the display 66 of the receiver 60. The presence or absence of wiring errors can be determined.

  As described above, a construction contractor of a building such as an apartment house or a power supplier checks the route of the power supply wiring.

Toshiyuki Ishizaki and Michio Shido “Development of Inspection and Connection System for Measuring Instruments” (Research Annual Report Vol. 38), Hokkaido Electric Power Co., Inc., October 22, 2007

  The wiring route inspection system disclosed in Non-Patent Document 1 (hereinafter referred to as “conventional wiring route inspection system”) is the inspection output from the transmitter if the general load current does not flow in the power supply wiring. The signal can be easily detected by the receiver. The “general load current” means a current that flows when a general load, that is, a load such as an electric product installed in each residence is applied.

  However, the receiver of the conventional wiring path inspection system cannot distinguish between the general load current and the inspection signal current. Therefore, in the conventional wiring path inspection system, when a general load current flows through the power supply wiring, it is difficult to detect the current of the inspection signal output from the transmitter with the receiver.

  Therefore, in the conventional wiring route inspection system, when a general load current flows through the power supply wiring, there is a wiring error between each watt hour meter in a building such as an apartment house and a residence corresponding to each watt hour meter. There was a problem that there were times when we could not check.

  The object of the present invention is to determine whether or not there is a wiring error between each watt hour meter in a building such as an apartment house and a dwelling corresponding to each watt hour meter even when a general load current flows through the power supply wiring. The receiver can easily and accurately distinguish the current section consisting only of the components of the general load current and the composite current section consisting of both the components of the general load current and the signal current so that it can always be checked. An object of the present invention is to provide a wiring route inspection system that can be used.

In order to solve the above-mentioned problem, the transmitter of the wiring route inspection system according to the present invention is:
(1) An input unit that can input an arbitrary code represented by M digits (where M is an integer);
(2) An inspection signal generation unit having the following configuration is provided.

That is, the inspection signal generation unit is an inspection signal including character signals of M characters that are output to the power supply wiring in response to the input of the code,
The character signal is
(A) Each bit section is composed of N bits (where N is an integer) allocated to a section of one period of the commercial frequency,
(B) It is formed as a signal current including a unit current that flows intermittently in units of one cycle determined by the frequency of the commercial power supply.
The inspection signal is generated.

Moreover, the receiver of the wiring route inspection system according to the present invention is:
(1) a display for displaying necessary information including a code;
(2) An inspection signal detection unit having the following configuration is provided.

That is, when the inspection signal detection unit is connected to the power supply wiring through which the general load current flows,
(A) The current flowing through the power supply wiring is detected as a detection current,
(B) For the detected current detected,
(I) An average value of detected currents and (ii) a waveform pattern of unit current by comparing with a threshold value determined to determine whether or not the detected current is a combined current of a general load current and a unit current. Detect
(C) An operation for identifying the character signal of the character corresponding to the appearance pattern from the appearance pattern of the waveform pattern of the unit current sequentially detected is performed until the identification of the character signal of the M characters is completed. Detect
(D) (i) obtaining a code of M-digit characters from the inspection signal, and (ii) displaying the obtained code on a display, and (e) a general load current every time a waveform pattern of unit current is detected. In order to avoid the occurrence of a waveform pattern detection failure due to the fluctuation of the threshold value, the threshold value is changed to a new threshold value based on the average value of the detected detection currents.

In addition, this wiring route inspection system is preferably
(1) The inspection signal generation unit starts an N-bit section of the next character by leaving a separation section composed of a predetermined number of bit sections from the N-bit section of the preceding character, and (2) the inspection signal detection section
(A) The threshold value is changed on the basis of the average value of the detected currents in the separated section, and (b) the waveform pattern of the unit current of the next character is detected in the bit section of the next character following the separated section. A configuration in which the average value of the detection currents is compared with a new threshold value is preferable.

  In the wiring route inspection system, preferably, the N bit section is represented by a binary value including a start bit section representing the head of the signal current and a binary value “1”, and a predetermined number of bit sections. Is preferably provided with a separation bit interval of “0” and a character bit interval of 6 bits.

  In such a configuration, it is more preferable that the N bit section further includes an odd parity bit section of a predetermined number of bit sections between the start bit section and the separation bit section. .

  The N bit section may further include an inverted parity bit section of a predetermined number of bit sections.

  In such a configuration, more preferably, the N bit period includes a start bit period of the first bit, an odd parity bit period of the second bit, and a separation bit period of the third bit. A 10-bit section composed of a character bit section of the fourth to ninth bits and an inverted parity bit section of the tenth bit may be used.

  In this wiring route inspection system, it is preferable that the inspection signal generator generates an “uninputted” character when the number of characters constituting the M-digit characters of the code is less than a predetermined number of M characters. It is preferable that the character signal associated with the symbol signifying “

  In this wiring route inspection system, preferably, the inspection signal generation unit has a storage unit that stores the number of acquisitions of the code and the acquired code in association with each other, and the number of acquisitions read from the storage unit And a code associated therewith may be displayed on the display.

  According to this wiring path inspection system, the inspection signal detector of the receiver changes the threshold value to a new threshold value based on the average value of the detected currents. As a result, even when the general load current is flowing in the power supply wiring, the receiver can receive the section of the current consisting only of the general load current component and the combined current consisting of both the general load current and the signal current. A section can be easily and accurately divided. Therefore, this wiring route inspection system can improve the reception accuracy of the inspection signal, and the current of the inspection signal output from the transmitter can be easily detected by the receiver. As a result, according to this wiring route inspection system, even when general load current is flowing in the power supply wiring, each watt hour meter in a building such as an apartment house and the dwelling corresponding to each watt hour meter It is possible to obtain an effect that it is possible to check whether there is a wiring error between the two.

  In this wiring route inspection system, (1) the inspection signal generation unit starts an N-bit section of the next character by leaving a separation section composed of a predetermined number of bit sections from the N-bit section of the preceding character, and ( 2) The inspection signal detection unit (a) changes the threshold value based on the current value of the detected current in the separated section, and (b) detects the waveform pattern of the unit current of the next character in the separated section. The receiver is changed to a value suitable for detecting the waveform pattern of the unit current of the next character by making a configuration in which the average value of the detected current in the bit section of the next character is compared with a new threshold value. The waveform pattern of the unit current of the next character is detected using the threshold value. Therefore, this wiring path inspection system can further improve the reception accuracy of the inspection signal. As a result, according to this wiring route inspection system, it is possible to constantly and stably check whether there is a wiring error between each watt-hour meter in a building such as an apartment house and a residence corresponding to each watt-hour meter. The effect of being able to be obtained can be obtained.

  The check signal generation unit of the transmitter is (1) a binary value consisting of an N bit interval, a start bit interval representing the beginning of the signal current and a binary value of “1”, and a predetermined number of bit intervals. Is provided with a separation bit interval having a value of “0” and a character bit interval of 6 bits, so that the receiver can convert the code converted based on the detected current to a number “0-9” or When the code other than the symbol meaning “not input” is used, it can be determined that the detected current is not the inspection signal. Therefore, according to this wiring path inspection system, the reception accuracy of the inspection signal can be increased also by this.

  Further, the reception accuracy of the inspection signal can be improved by adopting a configuration in which the N bit section further includes an odd parity bit section and an inverted parity bit section.

  The N bit period includes a start bit period of the first bit, an odd parity bit period of the second bit, a separation bit period of the third bit, and a character bit period of the fourth to ninth bits. The receiver has a 10-bit section composed of the inverted parity bit section of the 10th bit, so that the receiver converts the code converted based on the detected current to a number of “0-9” and “not input”. In the case of a code other than the symbol that means, it can be determined that the detected current is not an inspection signal. Therefore, according to this wiring path inspection system, the reception accuracy of the inspection signal can be increased also by this.

  In addition, the inspection signal generator corresponds to a symbol that means that the missing character is “not input” when the number of characters constituting the M-digit character of the code is less than the predetermined number of M characters. The transmitter outputs a code with a predetermined number of digits including a character meaning “not input” to the receiver by forming the attached character signal for the number of missing characters and outputting it. Can do. Thereby, according to this wiring route inspection system, a code having a predetermined number of digits can be correctly transmitted from the transmitter to the receiver.

  In addition, the inspection signal generation unit has a storage unit that stores the code acquisition count and the acquired code in association with each other, and the acquisition count read from the storage unit and the code associated therewith With the configuration of displaying on the display, the operator can check the number of acquisitions displayed on the display and the code associated with each acquisition number while comparing them. At this time, if the receiver displays a code output from a room different from the room to be inspected on the display, the power supply wiring is mistakenly wired. At this time, if the receiver displays a code output from a room different from the room to be inspected together with a code output from the room to be inspected, a redundant wiring of power supply wiring has occurred. become. Therefore, according to this wiring route inspection system, it is possible to easily detect a mistaken power supply wiring or an overlapping power supply wiring.

It is a block diagram of the system of an embodiment. It is attachment explanatory drawing to the power supply wiring of the system of embodiment. (A) And (B) is a figure which shows an example of an inspection signal. (A) And (B) is a figure which shows a response | compatibility with the appearance pattern of the character and the waveform of a unit current, respectively. It is a figure which shows the waveform of an electric current. It is an operation | movement flowchart (1) of the system of embodiment. It is an operation | movement flowchart (2) of the system of embodiment. It is explanatory drawing (1) of a threshold value. It is explanatory drawing (2) of a threshold value. It is a figure which shows an example of the display of the display of a receiver. It is a figure (1) showing an example of use of a system of an embodiment. It is FIG. (2) which shows the usage example of the system of embodiment. (A) and (B) are explanatory diagrams of connection errors, respectively. It is explanatory drawing of a wiring error. (A) And (B) is a figure which shows the structure of a wiring path | route inspection system, respectively. It is a figure which shows the prior art example of the current waveform of the inspection signal of one character. It is a figure which shows the conventional example of the check signal of a code | cord | chord, and a timing waveform. (A) And (B) is a figure (1) which shows the structure of a current transformer, respectively. It is a figure (2) which shows the structure of a current transformer. (A) And (B) is a figure which shows the usage example in the case of determining the presence or absence of a connection error, respectively. It is a figure (1) which shows the example of use in determining the presence or absence of a wiring error. It is FIG. (2) which shows the usage example in determining the presence or absence of a wiring error.

  Hereinafter, an embodiment of the present invention will be described with reference to the drawings. In addition, each figure has only shown each component roughly to such an extent that this invention can be understood. Therefore, the present invention is not limited to the illustrated example. Moreover, in each figure, the same code | symbol is attached | subjected about the common component and the same component, and those overlapping description is abbreviate | omitted. The numerical conditions described below are merely examples.

<Details of Wiring Route Inspection System of Embodiment>
"System configuration", "System power supply wiring installation and inspection overview", "Inspection signal details", "Synthetic current details", "System operation", and "System usage examples" The details of the wiring route inspection system of the embodiment will be described in the order of.

(System configuration)
The configuration of the wiring route inspection system according to the embodiment will be described below with reference to FIG. FIG. 1 is a block diagram showing the configuration of the system according to the embodiment.

  The wiring path inspection system 1 includes a transmitter 10 and a receiver 60.

  The transmitter 10 includes an input unit 14 in which an arbitrary code is input by an operator, for example, an input key 14 such as a numeric keypad, and a main component of an inspection signal generation unit 20 that outputs an inspection signal. A power switch 12 that is selected to be turned on or off, a display (LCD) 16 that displays necessary information, and a plug PL that is electrically connected to the power supply wiring Wi by being inserted into an outlet at the end of the power supply wiring Wi. And. The transmitter 10 receives the current input from the commercial power source E by being connected to the load-side power wiring Wi of the watt-hour meter Wh by inserting the plug PL into any outlet CN installed in each residence. By using this, an inspection signal can be sent to the power supply wiring Wi. The transmitter 10 further includes a power supply unit 26 that supplies power to each unit of the transmitter 10 and an input / output unit 28 that inputs and outputs data to and from an external computer.

  The inspection signal generation unit 20 includes a calculation unit 22 that executes various calculations, a storage unit 24 that stores various data, a dummy load that artificially applies a load to the power supply wiring Wi connected via the plug PL and the outlet CN. R, constituted by a triac or the like that intermittently cuts off the connection between the plug PL and the dummy load R to flow or cut off the commercial frequency current from the commercial power source (for example, 100V AC power source) E Switch SW and the like. This disconnection control of the switch SW will be described in the section “Evaluation of Inspection Signal” described later.

  The calculation unit 22 is configured by, for example, a CPU, and by reading a required program, the operation of the main control unit 22a that controls the operation of each unit and the operation of the switch SW are generated to generate an inspection signal as an analog signal Functional means such as a switch circuit control unit 22b for controlling the display and a display control unit 22c for controlling the operation of the display are constructed. The storage unit 24 is composed of, for example, a RAM, and stores a reference data storage unit 24a that stores various data referred to when generating an inspection signal, and an operation data storage that stores data such as an operation history of the transmitter 10. A storage area such as an input code storage unit 24c for storing a code (for example, a room number) input to the transmitter 10 by the operator operating the input key 14 is secured. The calculation unit 22 and the storage unit 24 operate with a digital signal, as is well known.

  The operation history of the transmitter 10 stored in the operation data storage unit 24b and the information such as the code stored in the input code storage unit 24c check, for example, whether or not the transmitter 10 is operating normally. This is utilized when the code output by the transmitter 10 and the code detected by the receiver 60 are compared and verified. For example, when the operator operates the input key 14 of the transmitter 10, in response to this, the display control unit 22c reads the operation history of the transmitter 10 from the operation data storage unit 24b, or the input code storage unit. The code output in the past by the transmitter 10 is read from 24 c and displayed on the display 16.

  On the other hand, the receiver 60 includes a power switch 62 that is selected to be turned on or off by an operator, an input unit 64 for inputting an arbitrary code or instruction by the operator, for example, an input key 64 such as a numeric keypad, and necessary information. Display (LCD) 66, current transformers CT1 and CT3 as connection terminals electrically connected to the power supply wiring Wi, and voltage terminal clips CL1, CL2, and CL3. CT1 and CT3 are respectively connected to the A line and B line of the power supply wiring Wi on the power supply side of the watt hour meter Wh, and the voltage terminal clips CL1, CL2, and CL3 are respectively connected to the load side connection terminals 1L, 2L of the watt hour meter Wh. , And 3L. In addition to the single-phase three-wire system, there are a single-phase two-wire system, a three-phase three-wire system, and the like. Two voltage terminal clips CL are required if the power supply system is a single-phase two-wire system, and three voltage terminal clips CL are required if the power supply system is a single-phase three-wire system or a three-phase three-wire system.

  In addition, the receiver 60 detects a current flowing through the power supply wiring Wi as an analog detection current, detects an inspection signal from the detected current, and a power supply unit that supplies power to each unit of the receiver 60 76 and an input / output unit 78 for inputting / outputting data to / from an external computer. The inspection signal detection unit 70 is a receiver through a calculation unit 72 that executes various calculations, a storage unit 74 that stores various data, current transformers CT1 and CT3, and voltage terminal clips CL1, CL2, and CL3. 60 includes a transformer TE that transforms the current of the commercial voltage input to 60 to an arbitrary voltage, an A / D converter 75 that converts an analog signal into a digital signal, and the like. The calculation unit 72 is configured by, for example, a CPU, and by reading a required program, the main control unit 72a that controls the operation of each unit internally determines whether the detected current detected is an inspection signal, In the case of an inspection signal, functional means such as a determination unit 72b that converts the code represented by the inspection signal and a display control unit 72c that controls the operation of the display are constructed. The storage unit 74 is constituted by, for example, a RAM, and various data referred to when detecting the inspection signal from the detection current input from the power supply wiring Wi to the receiver 60 and when converting the code into the code represented by the inspection signal. A reference data storage unit 74a for storing data, an operation data storage unit 74b for storing data such as an operation history of the receiver 60, and an instruction (for example, arbitrary) input to the receiver 60 by the operator operating the input key 64 A storage area such as a detection code storage unit 74c for storing a display of a code received at the number of times of reception is secured. Of course, since the calculation unit 72 and the storage unit 74 operate with digital signals, the analog signal converted by the transformer unit TE is A / D converted by the A / D conversion unit 75 and stored in the calculation unit 72 and the storage unit 74. Input to the unit 74.

(Outline of installation and inspection of system wiring)
Hereinafter, with reference to FIG. 1 and FIG. 2, an outline of installation and inspection of the system power supply wiring according to the embodiment will be described. FIG. 2 is an explanatory diagram of attachment of the system of the embodiment to the power supply wiring.

  When the plug PL is inserted into the outlet CN of the building by the operator, the transmitter 10 is in a state of being electrically connected to the power supply wiring Wi stretched around the building as shown in FIG.

  In this connection state, the inspection signal generation unit 20 of the transmitter 10 allows the operator to use an arbitrary code (for example, a room number) represented by a plurality of characters, that is, M digits (where M is an integer) from the input key 14. Is input, a signal current is generated as an inspection signal representing a code input by the operator and is output to the power supply wiring Wi. The inspection signal is composed of a series of character signals each representing each character of M digits. Each character signal is made up of N bits (where N is an integer). Each bit section of the N bit section is assigned to a section for one cycle determined by the frequency of the commercial power supply. Therefore, in the following description, the bit interval may be referred to as a periodic interval.

  A unit current is sequentially applied to each of Q bit sections (where Q is an integer) smaller than N in the N bit section. The combination of the bit positions of Q bits through which the unit current flows is different for each character, and the combination of the character and the position of the bit section has a one-to-one relationship. The unit current is a sine wave current having a commercial frequency of 50 Hz or 60 Hz, and flows intermittently in units of one cycle determined by the commercial frequency. The amplitude and waveform of the unit current flowing in each bit section are the same. Therefore, the character signal described above is a signal current including a series of unit currents flowing in Q bit sections, and the appearance pattern of the current waveform of each unit current that sequentially flows in each bit is different for each character. Details of the inspection signal will be described in detail in the section “Details of Inspection Signal”.

  The inspection signal, that is, the signal current output to the power supply wiring Wi is combined with the general load current flowing through the power supply wiring Wi. Hereinafter, the current obtained by combining the signal current and the general load current is referred to as “combined current”. Details of the composite current will be described in detail in the section “Details of Composite Current”.

  On the other hand, the connection terminals of the receiver 60 (specifically, the current transformers CT1 and CT3 and the voltage terminal clips CL1, CL2, and CL3) are connected by the operator to the power supply wiring Wi on the power supply side of the watt-hour meter Wh and the load side. Are electrically connected to the power supply wiring Wi.

  The receiver 60 connected to the power supply wiring Wi is in a reception waiting state for detecting an inspection signal, and a current flowing through the power supply wiring Wi is input as a detection current via the connection terminal. The detected current input from the power supply wiring Wi to the receiver 60 may be a current obtained by superimposing both components of the general load current and the signal current as the inspection signal. In some cases, the current is composed only of the components of the general load current that does not include the components. In the following description, for convenience of explanation, the current in either state input from the power supply wiring Wi to the receiver 60 is also referred to as “detected current”.

  When the detection current is input from the power supply wiring Wi, the inspection signal detection unit 70 (see FIG. 1) of the receiver 60 performs voltage conversion and A / D conversion, and in response to this, calculates an average value of the detection current. calculate. The calculation of the average value of the detection current will be described in detail in the section “Details of Composite Current”. The inspection signal detection unit 70 compares the average value of the detected current with a threshold value (described later “upper limit threshold value”) for each cycle of the commercial power supply, and detects both the general load current and the signal current from the detected current. The section of the combined current and the section of only the general load current component not including the inspection signal component are separated. Here, the upper limit threshold is determined in advance in order to determine whether or not the detected current is a combined current composed of both the general load current and the signal current. Thereby, the inspection signal detection part 70 detects the waveform pattern of the unit current, when the portion of the signal current, that is, the unit current exists every cycle. Hereinafter, the operation of detecting the waveform pattern of the unit current for each cycle by the inspection signal detection unit 70 is referred to as “unit current detection”. The one-cycle section in which the unit current is detected is a section in which the above-described combined current flows, and the one-cycle section in which the unit current is not detected is a section composed only of components of the general load current. Is determined.

  When the detected waveform pattern of the unit current for each period of one period reaches one character, the inspection signal detection unit 70 responds to this and the character corresponding to the appearance pattern of the waveform pattern of the unit current for one character Is converted to a character signal. The inspection signal detection unit 70 performs the conversion operation to the character signal until the converted character reaches the number of characters input by the operator and detects it as an inspection signal. As a result, the inspection signal detection unit 70 acquires the M-digit character code input from the input key 14 of the transmitter 10 by the operator from the detected inspection signal. Then, the inspection signal detection unit 70 displays the acquired code on the display 66.

  The operator confirms a code (for example, a room number) displayed on the display 66 of the receiver 60, so that which power wiring Wi around the watt hour meter Wh is the power wiring Wi wired to which residence. Can be checked.

  In the embodiment, the inspection signal detection unit 70 changes the threshold value to a new value threshold value based on the average value of the detected currents. And the inspection signal detection part 70 compares the average value of detected current with the threshold value changed into the new value with respect to the detected current detected after the change of the threshold value. Thereby, the receiver 60 improves the detection accuracy of the waveform pattern of the unit current for each section of one cycle, that is, the detection accuracy of the inspection signal as compared with the conventional case. This point will be described in detail in the chapter “System Operation”.

(Details of inspection signal)
The details of the inspection signal will be described below with reference to FIGS. 3 (A) and 3 (B) and FIGS. 4 (A) and 4 (B). 3A and 3B are diagrams illustrating an example of the inspection signal. FIGS. 4A and 4B are diagrams showing correspondence between characters and appearance patterns of unit current waveforms, respectively.

  The inspection signal is a current generated when the internal circuit of the transmitter 10 is turned on or off. The inspection signal represents a combination pattern of an energized state and a non-energized state in the internal circuit of the transmitter 10.

  For example, in the electric circuit shown in FIG. 2, the transmitter 10 includes a switch SW configured by a triac or the like. This switch SW is connected to a dummy load R and an AC voltage power supply of 100 volts (corresponding to the power supply E in FIG. 1). The switch SW opens and closes according to the control of the switch circuit control unit 22b (see FIG. 1). Then, the switch circuit control unit 22b synchronizes with the commercial frequency of 50 Hz or 60 Hz, that is, the power supply frequency, that is, synchronizes when the sine wave of the general load current passes through the zero point, and outputs the analog signal serving as the switching signal. The switch SW is sent to open and close the switch SW. As a result, the current flowing through the dummy load R is intermittently disconnected, and as a result, intermittent current is generated in units of one cycle determined by the power supply frequency. Note that the opening / closing pattern of the switch SW is determined in advance corresponding to the characters so that the same characters are the same and the different characters are different. Therefore, the intermittent current appears in a waveform pattern corresponding to the M-digit character representing the code. The intermittent current that appears in the waveform pattern corresponding to the M-digit character is the inspection signal (see FIG. 3). Therefore, the inspection signal is a signal current including a series of unit currents generated in a bit period defined for each character, that is, one period determined by the power supply frequency.

  In this embodiment, the open / close pattern of the switch SW matches the configuration pattern of the signal current of the character signal corresponding to the eleven types of characters described with reference to Table 1 and FIG. The configuration pattern of the signal current of the character signal corresponding to these 11 types of characters, that is, the switch SW open / close pattern, is stored in the reference data storage unit 24a of the storage unit 24, and the switch circuit control unit 22b switches the switch SW. Referenced when opening and closing. Hereinafter, the configuration pattern of the signal current of the character signal corresponding to 11 types of characters, that is, the open / close pattern of the switch SW is referred to as a “reference configuration pattern”. When the switch circuit control unit 22b opens and closes the switch SW, the switch circuit control unit 22b reads each reference configuration pattern from the reference data storage unit 24a, and sends a switching signal to the switch SW based on each read reference configuration pattern. Open and close.

  FIGS. 3A and 3B show examples of inspection signals representing a 5-digit code “66666” in which each digit is the character “6”. CH1 shown in FIGS. 3A and 3B represents the current waveform of the inspection signal, and CH2 shown in FIG. 3B represents the timing for measuring the unit current of the inspection signal. . Note that CH1 and CH2 below the arrow shown in FIG. 3B show waveforms that are further normalized by expanding CH1 and CH2 above the arrow.

  In the embodiment, the types of characters handled are limited to 11 types of numbers “0 to 9” and minus “−”. These 11 types of characters can be represented by 6 bits. In this case, the character signal is represented as a 10-bit signal with N = 10, for example. In this case, the configuration pattern shown in Table 1 below is obtained. .

  Table 1 shows the bit structure of the binary value (bit value) of the character signal for each character. It should be noted that the bit value “1” in Table 1 indicates the “current amplitude” state of the unit current, and the bit value “0” indicates the “no amplitude” state of the unit current. FIG. 4A shows the appearance pattern of the waveform pattern of unit current corresponding to the 11 types of characters in Table 1. For these eleven types of characters, the character “0” has a Q of 5, and a unit current flows in the first, second, fourth, fifth and tenth bits. In the character “1”, Q is 4, and a unit current flows in the first, fourth, fifth and ninth bits. In the character “2”, Q is 5, and a unit current flows in the first, fourth, fifth, eighth and tenth bits. In the character “3”, Q is 6, and a unit current flows in the first, second, fourth, fifth, eighth and ninth bits. In the character “4”, Q is 5, and a unit current flows in the first, fourth, fifth, seventh and tenth bits. In the character “5”, Q is 6, and a unit current flows in the first, second, fourth, fifth, seventh and ninth bits. In the character “6”, Q is 7, and a unit current flows in the first, second, fourth, fifth, seventh, eighth and tenth bits. In the character “7”, Q is 6, and the unit current flows in the first, fourth, fifth, seventh, eighth and ninth bits. In the character “8”, Q is 5, and a unit current flows in the first, fourth, fifth, sixth and tenth bits. In the character “9”, Q is 6, and a unit current flows in the first, second, fourth, fifth, sixth and ninth bits. In the symbol “-”, Q is 6, and a unit current flows in the first, second, fourth, sixth, seventh and ninth bits.

  The signal currents constituting the character signals of these 11 types of characters are represented by binary codes, the first bit being a start bit representing the head of the signal current, and the fourth to ninth bits being characters representing characters. It becomes a bit (see Table 1 and FIG. 4B). The second bit is a parity bit that is assigned so that the Q from the second bit to the ninth bit is an odd number. Therefore, hereinafter, the second bit is referred to as “odd parity bit”.

  For example, for the character signal of the character “7”, when “1” of the eighth bit cannot be received, the Q from the second bit to the ninth bit is 4, that is, an even number. Can be determined. On the other hand, when the odd parity bit is not provided, the character “5” is erroneously displayed. Thus, by providing odd parity bits, the reliability of data reception can be improved.

  The tenth bit is a parity bit that is assigned to be “0” if the ninth bit is “1” and “1” if the ninth bit is “0”. Therefore, hereinafter, the 10th bit is referred to as an “inverted parity bit”.

  For example, when the eighth to tenth bits cannot be received for the character signal of the character “3”, the ninth bit and the tenth bit are both “0”, so that it can be determined as a reception error. On the other hand, if the inverted parity bit is not provided, the character “0” is erroneously displayed. Thus, by providing the inverted parity bit, the reliability of data reception can be improved.

  Further, since the bit value of the third bit is always “0”, it can be used as a bit representing a separation point between the start bit and the character bit. Therefore, the third bit is hereinafter referred to as “separation bit”. In this embodiment, the start bit is included in the character signal bit pattern. However, the start bit may not be included in the bit pattern of the character signal.

  As shown in FIG. 4B, the signal currents of the eleven types of characters described above always have the bit values of the first bit (start bit) and the fourth bit (first bit of the character bits) set to “1”. Therefore, the unit current is present, and the bit value of the third bit (separation bit) is always “0”, and therefore the unit current does not exist. Hereinafter, this regularity is referred to as “regularity of signal current”.

  In the example shown in FIG. 3, one code is composed of a 5-digit character string. Thus, in the embodiment, a description will be given assuming that one code is composed of a character string having a predetermined number of characters. In addition, if the character string key-input by the operator is less than a predetermined number of characters (here, 5 digits), the transmitter 10 is placed before the character string key-input by the operator. Assume that a minus “−” is inserted for the number of missing digits as a character meaning “not entered”. Therefore, in such a case, the transmitter 10 generates a signal current representing the minus “−” corresponding to the number of missing digits and the numbers “0” to “9” keyed by the operator. And output to the power supply wiring Wi. The signal current output to the power supply wiring Wi is combined with the general load current flowing through the power supply wiring Wi and then input to the receiver 60 from the power supply wiring Wi.

  It is preferable that the transmitter 10 and the receiver 60 described above can set the magnitude of the unit signal in accordance with the magnitude of the general load current flowing through the power wiring Wi to be inspected. The reason is that even if the operation status of a general load, that is, an electrical product is constant, the general load current varies somewhat due to fluctuations in the power supply voltage, etc. This is because the unit 60 and thus the signal current cannot be detected by the device 60. The reason for this will be described in detail below.

  For example, when the general load current fluctuates by 5% and the unit current is 1.0 ampere, the case where the general load current is 10 amperes and 50 amperes is compared. . When the magnitude of the general load current is 10 amperes, the fluctuation amount of the general load current is 10 × 0.05 = 0.5 amperes. This variation is smaller than the unit current. Therefore, the receiver 60 can detect the unit current, that is, the signal current from the detected current. On the other hand, when the magnitude of the general load current is 50 amperes, the fluctuation amount of the general load current is 50 × 0.05 = 2.5 amperes. This variation is larger than the unit current. Therefore, the receiver 60 cannot detect the unit current, that is, the signal current from the detected current. Therefore, the transmitter 10 and the receiver 60 have a unit current magnitude and a general load current magnitude that flows through the power wiring Wi to be inspected so that the receiver 60 can always detect the signal current from the detected current. It is preferable to set it accordingly.

(Details of synthesized current)
Hereinafter, the details of the combined current will be described with reference to FIG. FIG. 5 is a diagram showing a current waveform. FIG. 5 shows the waveform of the general load current as “waveform 1”, the waveform of the signal current of the character signal representing the character “6” as “waveform 2”, and the general load current and the signal current are combined. The waveform of the combined current is shown as “waveform 3”.

  For example, in the electric circuit shown in FIG. 2, it is assumed that a general load current (refer to “waveform 1” in FIG. 5) of (average value 5 amperes) flows in the power supply wiring Wi. The “average value” means an area corresponding to a half cycle of a waveform in an alternating current. The “average value” is a current value obtained by dividing the waveform into an arbitrary number, measuring the current value for each divided period, and dividing the sum by the arbitrary number of divisions.

  Here, in the electric circuit shown in FIG. 2, it is assumed that a signal current (refer to “waveform 2” in FIG. 5) representing the character “6” of (average value 2 amperes) is output from the transmitter 10 to the power supply wiring Wi. . The configuration of the signal current representing the character “6” is as shown in Table 2 below.

  In Table 2, the configuration of the signal current is indicated by the presence / absence of a unit current flowing in each bit section. In the example shown in FIG. 5, the transmitter 10 outputs the signal current representing the character “6” shown in Table 2 to the power supply wiring Wi in the 10-bit section of the bit sections 2 to 11. In FIG. 5, the bit interval is indicated by a circled number. The transmitter 10 outputs a signal current for one character consisting of the first 10 bits to the power supply wiring Wi, and then places the next 10 bits at intervals of a predetermined separation interval, that is, a predetermined bit interval. Is output to the power supply wiring Wi. In the example shown in FIG. 5, with respect to a signal current of 10 cycles per character string, a 2-cycle (bit) interval (specifically, a bit) between the preceding character and the following character. 2 periods (bits) of sections 12 and 13). Therefore, when the transmitter 10 outputs a code of a five-digit character string, it outputs in a time corresponding to 10 cycles × 5 + 2 cycles × 4 = 58 cycles. Since the commercial frequency is 50 Hz or 60 Hz, the oscillator 10 outputs a 5-digit character string code in a time of about 1 second.

  The signal current as the character signal output to the power supply wiring Wi is combined with the general load current in which each unit current constituting the signal current flows through the power supply wiring Wi. As a result, a combined current (see “Waveform 3” in FIG. 5) is generated. This combined current has an average value of 5 amperes in the section where the peak value of the unit current is not generated (that is, the bit sections 1, 4, 7, 10, 12, 13, 15). In addition, this combined current is a signal current that is 5 amperes of the average value of the general load current in the section where the unit current is generated (that is, the bit sections 2, 3, 5, 6, 8, 9, 11, 14). By adding 2 amperes of the average value, the average value in these sections is 7 amperes.

(System operation)
The outline of the system operation will be described below.

  The operator operates the transmitter 10 and the receiver 60 as follows in order to cause the system of the embodiment to perform such detection.

  That is, the operator first goes to the place where the watt hour meter Wh is installed with the receiver 60 and the transmitter 10.

  Then, the operator turns on the power of the receiver 60 by turning on the power switch 62 of the receiver 60. When the power is turned on, the receiver 60 displays a menu screen on the display 66 in response thereto. This menu screen includes, for example, a column for inputting an initial code shown in Table 3 below. The operator operates the input key 64 of the receiver 60 to input an arbitrary initial code.

  Here, it is assumed that the operator has input a code (“2”) corresponding to a 100/200 V type single-phase three-wire power supply method as an initial code. As a result, the receiver 60 enters a standby state for receiving a combined signal corresponding to a 100/200 V single-phase three-wire power supply method.

  Next, the operator supplies power to the current transformers CT1 and CT3 of the receiver 60 in a state where only a general load current flows through the power supply wiring Wi, that is, in a state where the transmitter 10 does not output an inspection signal. By connecting the voltage terminal clips CL1, CL2, and CL3 to the A line, the B line, and the C line of the load-side power supply wiring Wi, respectively, As shown in FIG. 1, the receiver 60 is connected to the power supply wiring Wi.

  At this time, the receiver 60 includes a general load current that does not include the component of the unit current of the inspection signal, that is, the current of “waveform 3” flowing in the bit section 1 of FIG. Current consisting only of the component) is input as the detection current.

  When the detection current of “waveform 3” flowing in the bit section 1 of FIG. 5 is input, the pattern detection means 73a of the determination unit 72b of the inspection signal detection unit 70 of the receiver 60 is input in response to the input. An average value of the detected current is acquired, and the average value is stored as digital data in the operation data storage unit 74 b of the storage unit 74. Thereby, the receiver 60 stores the average value of the general load current, that is, the average value of the combined current first measured after the power is turned on, in the operation data storage unit 74 b of the storage unit 74.

  Next, as shown in FIG. 1, the operator connects the transmitter 10 to the power supply wiring Wi stretched around the building. At this time, CT1 and CT3 of the receiver 60 are connected to the A line and the B line of the power supply wiring Wi. Therefore, the operator connects the transmitter 10 to the A line and the B line of the power supply wiring Wi by any one of the following first and second connection methods, and outputs an inspection signal as an analog signal.

  As a first connection method, the operator first takes the transmitter 10, goes to the location of the outlet CN installed in the residence to be inspected, and connects the plug PL of the transmitter 10 to the A line of the power supply wiring Wi. Is inserted into one of the outlets CN in the residence connected to, and an inspection signal is output. Subsequently, the plug PL of the transmitter 10 is inserted into one place of the outlet CN in the residence connected to the B line of the power supply wiring Wi, and an inspection signal is output.

  Alternatively, as a second connection method, the operator takes the transmitter 10 and goes to the place where the distribution board B (see FIG. 22) is installed, and plugs the plug PL of the transmitter 10 into the socket of the cable CB shown in FIG. Then, the voltage terminal clips cl1 and cl2 of the cable CB are connected to the A line of the power supply wiring Wi connected to the terminal 1L of the watt hour meter and the B line of the power supply wiring Wi connected to the terminal 3L. To output an inspection signal.

  In actual work, it is impossible to determine whether the outlet CN installed in a house or the like is connected to the A line or the B line from the appearance. For this reason, the operator often connects the transmitter 10 to the A line and the B line of the power supply wiring Wi by the second connection method.

  Next, the operator inputs an arbitrary code (for example, a room number) composed of a plurality of character strings from the input key 14 of the transmitter 10. Here, the description will be made assuming that the code is composed of predetermined M-digit (for example, five-digit) characters. In response to the input of the code by the operator, the inspection signal generation unit 20 of the transmitter 10 is stored in advance from the reference data storage unit 24a of the storage unit 24 in units of bit patterns of character signals. Read each reference configuration pattern of the signal current of the character signal corresponding to 11 types of characters defined in Table 1, and based on each reference configuration pattern, each character signal corresponding to the input character, one character at a time, It is generated as a signal current in an N-bit section (here, 10-bit section) as described with reference to Table 1 and FIG. When the character string input by the operator is less than the predetermined M digits, for example, (M-2) digits, the inspection signal generation unit 20 of the transmitter 10 performs the key input by the operator. Insert the minus “-” for the two missing digits as a character meaning “not entered” in front of the written character string, and change the signal current, power cycle of 50 Hz or 60 Hz one character at a time. It is generated in a unit cycle, that is, in a cycle synchronized with the commercial frequency.

  When the inspection signal generation unit 20 of the transmitter 10 generates the inspection signal, in response to this, the generated inspection signal is sent to the A line of the power supply wiring Wi on the load side via the voltage terminal clips cl1 and cl2 of the cable CB. , And B are sequentially output one character at a time. Since a 1-bit section is a one-cycle section, a signal current of one character is divided into 10-period sections and output in one unit current mode (in bit sections 2 to 11 in FIG. 5). (Refer to “Waveform 2”). As described above, in the embodiment, a predetermined interval in which no signal current exists between characters (here, a period corresponding to two periods of bit periods 12 and 13 in FIG. 5). Is set. The transmitter 10 outputs the signal current of the second character (the section after the bit section 14 in FIG. 5) following the two periods.

  As already described with reference to FIG. 5, the signal current output to the power supply wiring Wi is combined with the general load current flowing in the power supply wiring Wi, and the “waveform flowing in the bit sections 2 to 11 in FIG. 5. 3 ”, that is, a combined current composed of both components of a general load current and a signal current (specifically, a unit current portion). Here, as an example, the “waveform 3” current flowing in the bit sections 2 to 11 in FIG. 5, that is, the average value of the combined current composed of both the general load current and the signal current is “7 amperes”. It will be explained as a thing.

In the pattern detection means 73a of the determination unit 72b of the inspection signal detection unit 70 of the receiver 60, the detection current of “waveform 3” flowing in the bit sections 2 to 11 in FIG. 5 is A / D converted and input as a digital signal. In response to this, the average value of the detected currents is acquired. In order to determine whether or not the detected current is a combined current composed of both components of the general load current and the signal current, the determination unit 72b of the receiver 60 calculates the average of the detected current for each cycle determined by the power supply frequency. The value is compared with a threshold value (hereinafter referred to as “upper limit threshold value”) as a predetermined digital value. Based on this comparison, when the average value of the detected currents exceeds the threshold value, it is determined that there is a unit current flowing in the section of one cycle compared to “there is a signal current” with respect to the combined current. On the other hand, when the average value of the detected currents is equal to or smaller than the threshold value, it is determined that there is no unit current flowing in the section of one cycle compared with “no signal current” with respect to the detected current. As a result, the receiver 60 has a combined current section (hereinafter referred to as a “section with a signal current”) composed of both components of the detected current, the general load current, the signal current, and thus the unit current, and the signal current and the unit. By separating a section consisting only of the general load current component that does not include a current component (hereinafter referred to as a “no signal current” section), a waveform pattern of a unit current for each cycle is detected.

  The relationship between the threshold value and the general load current and unit current in the bit interval corresponding to one cycle of the signal current is expressed by the following equation (1).

| (Average value of general load current) | ≦ Threshold <| (Average value of general load current + Average value of unit current) | = | (Average value of combined current) | (1)
For example, assume that the threshold is 6 amperes. And the determination part 72b of the receiver 60 shall compare the average value of detection electric current shown in FIG. 5, and a threshold value for every area of 1 period. In this case, the pattern detection unit 73a of the determination unit 72b determines that “there is no signal current because there is no unit current for the detected current when the average value of the detected current, that is, the average value of the combined current is 6 amperes or less. In addition, when the average value of the detected currents, that is, the average value of the combined currents exceeds 6 amperes, it is determined that “there is a signal current” because there is a unit current for the detected current. The pattern detection unit 73a of the determination unit 72b sequentially performs such determination, and temporarily stores the determination result as digital data in the operation data storage unit 74b of the storage unit 74.

  When the pattern detection means 73a of the determination unit 72b stores the determination result in the operation data storage unit 74b, the bit section “with signal current” is set to the bit value “1” and the bit section “without signal current” is set to the bit value. Store in bit pattern set to “0”. This bit pattern corresponds to the appearance pattern of the current waveform of the unit current.

  Next, the character signal of the character corresponding to these appearance patterns is specified from the appearance patterns of the waveform pattern of the unit current obtained by sequentially detecting in this way.

  This specification is performed as follows. In response to storing the determination result, the character signal specifying unit 73b of the determination unit 72b reads a bit pattern representing the appearance pattern of the unit current from the operation data storage unit 74b and refers to the reference data storage unit 74a of the storage unit 74. Each reference configuration pattern of the signal current of the character signal corresponding to the 11 types of characters specified in Table 1 stored in advance in the bit pattern unit of the character signal in the data storage unit 74a is read, and the appearance pattern of the unit current and the 11 types Each reference pattern of each character is sequentially compared between bit patterns.

  In this comparison, if the bit pattern representing the appearance pattern of the unit current matches any of the 11 types of character reference configuration patterns, this bit pattern is the character signal represented by the matching reference configuration pattern. Since the current is determined, the character signal can be specified from the determined signal current. Therefore, in this comparison, when the character signals of all 11 types of characters are sequentially specified, the check signals are obtained by time-arranging the character signals in the specified order, and the check signals are operated as digital data. Once stored in the data storage unit 74b. Thus, the inspection signal can be detected from the detection signal by detecting the appearance pattern of the unit current from the inspection signal and determining the character signal corresponding to each character from the detected appearance pattern of the unit current.

  Next, the code acquisition unit 73c of the determination unit 72b acquires a code from the detected inspection signal. Therefore, the code acquisition means 73c reads the inspection signal from the operation data storage unit 74b, and the character signals constituting each character signal included in the inspection signal have a corresponding relationship with each character. To each character.

  An example of this conversion is shown in Table 4 below.

  In the example of this table, the presence / absence of a unit current is determined in each bit section from the first bit to the tenth bit, and a unit current appearance pattern is formed. It is indicated that the character corresponding to this appearance pattern is “6”.

  The code acquisition unit 73c associates the converted character with the appearance pattern of the signal current of the character signal and stores it as digital data in the detection code storage unit 74c of the storage unit 74. In this manner, a character string having a predetermined number of digits is stored as digital data in the detection code storage unit 74c, thereby acquiring a code key-input by the operator.

  When the character string stored in the detection code storage unit 74c is aligned with a predetermined number of digits (here, 5 digits), the display control unit 72c responds to the 5-digit character from the detection code storage unit 74c. The column is read, and the read five-digit character string is output to the display 66 and displayed on the display 66 as a code key-input by the operator.

  Note that, as already described with reference to FIG. 4B, according to the embodiment, by limiting the types of characters handled to 11 types of numbers “0-9” and minus “−”, The bit values of the first bit (start bit) and the fourth bit (first bit of the character bit) are always “1”, and the bit value of the third bit (separation bit) is always “0”. The regularity of the signal current is obtained. Thus, according to the embodiment, the determination unit 72b of the inspection signal detection unit 70 of the receiver 60 compares the waveform of the combined current in the section for 10 cycles with the regularity of the signal current, thereby obtaining one It can be easily determined whether or not the waveform of the combined current in the section corresponding to 10 periods corresponding to the character signal includes the signal current. As a result, the receiver 60 can easily and accurately detect the signal current corresponding to the character from the combined current.

  Hereinafter, the operation of the receiver 60 will be described in detail with reference to FIG. 6, FIG. 7, FIG. 8, and FIG. 6 and 7 are operation flowcharts of the system according to the embodiment. 8 and 9 are explanatory diagrams of threshold values. 8 and 9 show the waveform of the general load current as “waveform 1”, the waveform of the signal current representing the character “6” as “waveform 2”, and the general load current and the signal current are combined. The waveform of the combined current is shown as “waveform 3”.

  The combined current as the detection current shown as “waveform 3” in FIG. 8 is sequentially and sequentially input to the receiver 60 from the power supply wiring Wi one cycle at a time. The average value of the combined current is temporarily stored in the operation data storage unit 74b of the storage unit 74 as measurement data as needed. And the inspection signal detection part 70 of the receiver 60 performs a series of operation | movement shown by a flow in FIG.6 and FIG.7. As already described, the signal current is formed by unit currents that flow in one period section at a location designated corresponding to the character. Here, it is assumed that the theoretical signal current corresponding to the magnitude of the general load current, that is, the average value b of the unit current is stored in advance in the reference data storage unit 74a as digital reference data. In addition, in the reference data storage unit 74a, equations to be described later are stored in advance, and in the operation described below, the pattern detection unit 73a of the determination unit 72b of the inspection signal detection unit 70 of the receiver 60 performs reference data Each formula is read from the storage unit 74a, and each calculation is performed according to the read formula.

  That is, first, the pattern detection means 73a of the determination unit 72b reads the digital measurement data (see FIG. 8 [Waveform 3]) stored in the operation data storage unit 74b, and measures the detection current in the first cycle. The average value m is calculated (S105). In FIG. 8, each cycle is indicated by a circled number. That is, the waveform of the first period is indicated by a circled number 1.

  As shown in FIG. 8, the detection current in the first cycle is a current composed only of a general load current component that does not include a signal current component. Therefore, the average value m (= a) of the detected current in the first cycle represents the average value of the general load current. In the example shown in FIG. 8, the average value m (= a) of the detection current in the first cycle is 5 amperes. Therefore, in the example shown in FIG. 8, the pattern detection unit 73a of the determination unit 72b calculates 5 amperes as the average value m (= a) of the detection current in the first cycle.

  When the pattern detection means 73a of the determination unit 72b calculates the average value m (= a) of the detection current in the first cycle, it is input to the receiver 60 according to the following equation (2) in response to this. A threshold for detecting the current (hereinafter referred to as “lower limit threshold”) c is calculated as digital data, and the calculated lower limit threshold c is stored in the operation data storage unit 74b (S110).

c = a × 1.0 (2)
Further, the pattern detection means 73a of the determination unit 72b reads the signal current and hence the average value b of the unit current from the reference data storage unit 74a, and sets the threshold value (that is, the “upper threshold value”) e according to the following equation (3). calculate. The upper limit threshold e is used to determine whether or not the detected current is a combined current composed of both the general load current and the signal current. The pattern detection unit 73a stores the calculated upper threshold e as digital data in the operation data storage unit 74b (S110).

e = (m + b × 0.6) (3)
Hereinafter, the operation of calculating or specifying the value and storing it in the operation data storage unit 74b is referred to as “setting”.

  In the example shown in FIG. 8, the average value m (= a) of the detection current in the first cycle is 5 amperes. Therefore, the calculation result of Expression (2) is 5.0. Therefore, in the example illustrated in FIG. 8, the pattern detection unit 73a of the determination unit 72b sets a digital value representing 5.0 amperes as the lower limit threshold c in the operation data storage unit 74b.

  In the example shown in FIG. 8, the average value b of the signal current is 2 amperes. Therefore, the calculation result of Expression (3) is 6.2 amperes. Therefore, in the example shown in FIG. 8, the pattern detection unit 73a of the determination unit 72b sets a digital value representing 6.2 amperes as the upper limit threshold e.

  When the lower limit threshold c and the upper limit threshold e are set, the pattern detection unit 73a of the determination unit 72b reads the measurement data (see FIG. 8 [Waveform 3]) stored in the operation data storage 74b in response to the setting. An average value m (= d) is calculated by measuring the detected current in the second cycle (S115). As shown in FIG. 8, the second cycle (indicated by a circled numeral 2 in FIG. 8) is the first bit, that is, the start bit section. For this reason, the detection current in the second cycle is a combined current composed of both the general load current and the signal current. In the example shown in FIG. 8, the average value m (= d) of the detection current in the second cycle is 7 amperes. Therefore, in the example shown in FIG. 8, the pattern detection unit 73a of the determination unit 72b calculates 7 amperes as the average value d of the detection current in the second period.

  When the pattern detection means 73a of the determination unit 72b calculates the average value d of the detection current in the second cycle, in response to this, the lower limit threshold c is read from the operation data storage unit 74b, and the average of the detection current in the second cycle It is determined whether or not the value d is greater than the lower threshold c (S120).

  When it is determined in S120 that the average value m (= d) of the detection current in the second cycle is greater than the lower limit threshold c (Yes), the process proceeds to S125. On the other hand, when it is determined that the average value d of the detected current in the second cycle is equal to or lower than the lower limit threshold c (No), the process returns to S110 via S130.

  That is, when it is determined in S120 that the average value d of the detection current in the second cycle is larger than the lower limit threshold c, the pattern detection unit 73a of the determination unit 72b sets the upper limit threshold e from the operation data storage unit 74b. It is determined whether or not the average value d of the detection current in the second period is greater than the upper limit threshold e (S125).

  On the other hand, when it is determined in S120 that the average value d of the detected current in the second cycle is equal to or lower than the lower limit threshold c, the pattern detection unit 73a of the determination unit 72b determines the average value of the detected current in the second cycle. Is reset to the average value m of the detected current in the first cycle (S130), and the operations from S110 to S120 are repeated again. In this case, the pattern detection means 73a sets the lower limit threshold c and the upper limit threshold e based on the reset average value m of the detected current in the first cycle (S110), and sets the detected current in the next cycle to two cycles. It is measured as the detected current of the eye, and the average value m is calculated (S115).

  If it is determined in S125 that the average value m (= d) of the detection current in the second cycle is greater than the upper limit threshold e (Yes), the process proceeds to S140. On the other hand, when it is determined that the average value m (= d) of the detection current in the second cycle is equal to or lower than the upper threshold e (No), the process returns to S115.

  That is, when it is determined in S125 that the average value m (= d) of the detection current in the second cycle is larger than the upper limit threshold e, the pattern detection unit 73a of the determination unit 72b performs the first bit of the signal current. The bit value corresponding to the first (start bit period) is set to “1” indicating that there is a unit current, that is, the bit value of the first bit of the signal current is associated with “1” and the operation of the storage unit 74 The data is stored in the data storage unit 74b (S140).

  On the other hand, when it is determined in S125 that the average value d of the detected current in the second period is equal to or less than the upper limit threshold e, the pattern detection unit 73a of the determination unit 72b supplies the detected current in the next period for two periods. It is measured as the detected current of the eye, and the average value m is calculated (S115).

  In S140, when the pattern detection unit 73a of the determination unit 72b sets “1” as the bit value corresponding to the first bit of the signal current, that is, the start bit period, the pattern detection unit 73a operates in response to this. The measurement data stored in the data storage unit 74b (see [Waveform 3] in FIG. 8) is read, the detected current in the third period is measured, and the average value m (= f) is calculated (S150). As shown in FIG. 8, the detection current in the third period is composed of both the general load current and the signal current. In the example shown in FIG. 8, the average value m (= f) of the detected current in the third period is 7 amperes. Therefore, in the example shown in FIG. 8, the pattern detection unit 73a of the determination unit 72b calculates 7 amperes as the average value m (= f) of the detected current in the third period.

  When the pattern detection means 73a of the determination unit 72b calculates the average value m (= f) of the detection current in the third cycle, in response to this, the upper limit threshold e is read from the operation data storage unit 74b. It is determined whether or not the average value m (= f) of the detected current is larger than the upper limit threshold e (S155).

  If it is determined in S155 that the average value m (= f) of the detected current in the third period is greater than the upper limit threshold e (Yes), the process proceeds to S170 via S160. On the other hand, if it is determined in S155 that the average value m (= f) of the detected current in the third period is equal to or less than the upper threshold e (No), the process proceeds to S170 via S165.

  That is, when it is determined in S155 that the average value m (= f) of the detected current in the third period is greater than the upper limit threshold e (Yes), the pattern detecting unit 73a of the determining unit 72b “1” indicating that there is a unit current is set as the bit value corresponding to the second bit (odd parity bit section), that is, “1” is stored in association with the bit value of the second bit of the signal current. The data is stored in the operation data storage unit 74b of the unit 74 (S160).

  On the other hand, if it is determined in S155 that the average value m (= f) of the detected current in the third period is equal to or less than the upper limit threshold e (No), the pattern detecting unit 73a of the determining unit 72b “0” indicating that there is no unit current is set as the bit value corresponding to the second bit (odd parity bit section) of the second bit, that is, “0” is associated with the bit value of the second bit of the signal current. The data is stored in the operation data storage unit 74b of the storage unit 74 (S165).

  In S160 or S165, when the pattern detection means 73a of the determination unit 72b sets a bit value corresponding to the second bit (odd parity bit interval) of the signal current, it is stored in the operation data storage unit 74b in response to this. The measured data (see [waveform 3] in FIG. 8) is read, the detected current in the fourth period is measured, and the average value g is calculated (S170). As shown in FIG. 8, the detection current in the fourth period is the third bit, that is, the separation bit section of the combined current composed of both the general load current and the signal current. In the example shown in FIG. 8, the average value m (= g) of the detection current in the fourth period is 5 amperes. Therefore, in the example shown in FIG. 8, the pattern detection unit 73a of the determination unit 72b calculates 5 amperes as the average value m (= g) of the detection current in the fourth period.

  When the pattern detection means 73a of the determination unit 72b calculates the average value m (= g) of the detection current in the fourth period, in response to this, the upper limit threshold e is read from the operation data storage unit 74b. It is determined whether or not the average value m (= g) of the detected current is larger than the upper limit threshold e (S175).

  If it is determined in S175 that the average value m (= g) of the detected current in the fourth cycle is equal to or less than the upper threshold e (No), the process proceeds to S190 via S180. On the other hand, if it is determined in S175 that the average value m (= g) of the detected current in the fourth period is greater than the upper threshold e (Yes), the process proceeds to S176.

  That is, when it is determined in S175 that the average value m (= g) of the detected current in the fourth cycle is equal to or less than the upper limit threshold e (No), the pattern detecting unit 73a of the determining unit 72b "0" is set as the bit value corresponding to the third bit (separation bit section) of the signal, that is, the operation data storage unit of the storage unit 74 is associated with "0" as the bit value of the third bit of the signal current. 74b is stored (S180).

  On the other hand, if it is determined in S175 that the average value m (= g) of the detected current in the fourth period is larger than the upper limit threshold e (Yes), the pattern detection unit 73a of the determination unit 72b detects the current value. It is determined whether or not the current signal current is the signal current of the first character (S176). This determination is made, for example, by the pattern detection unit 73a referring to a character string stored in the detection code 74c of the storage unit 74.

  If it is determined in step S176 that the first character is not the first character (No), the process proceeds to step S190 via step S177. On the other hand, if it is determined in S176 that the first character is “Yes”, the process returns to S110 via S178.

  That is, if it is determined in S176 that the character is not the first character, “1” is set as the bit value corresponding to the third bit (separation bit section) of the signal current, that is, the third bit of the signal current. “1” is associated with the bit value of the eye and stored in the operation data storage unit 74b of the storage unit 74 (S177).

  On the other hand, if it is determined in S176 that the character is the first character, the pattern detection unit 73a of the determination unit 72b determines the average value of the detected current in the fourth cycle as the average value m of the detected current in the first cycle. (S178), and the operations from S110 to S175 are repeated again.

  In S180 or S177, when the pattern detection means 73a of the determination unit 72b sets “0” or “1” as the bit value corresponding to the third bit of the signal current, that is, the separation bit section, in response to this, The detection means 73a reads the measurement data (see [Waveform 3] in FIG. 8) stored in the operation data storage unit 74b, measures the detected current in the fifth cycle, and calculates the average value m (= h) ( S190). As shown in FIG. 8, the detection current in the fifth cycle is the fourth bit of the combined current composed of both the general load current and the signal current, that is, the first bit section of the character bit. In the example shown in FIG. 8, the average value m (= h) of the detection current in the fifth period is 7 amperes. Therefore, in the example shown in FIG. 8, the pattern detection unit 73a of the determination unit 72b calculates 7 amperes as the average value m (= h) of the detection current in the fifth cycle.

  When the pattern detection means 73a of the determination unit 72b calculates the average value m (= h) of the detection current in the fifth cycle, in response to this, the upper limit threshold e is read from the operation data storage unit 74b. It is determined whether or not the average value m (= h) of the detected current is larger than the upper limit threshold e (S195).

  If it is determined in S195 that the average value m (= h) of the detection current in the fifth cycle is greater than the upper limit threshold e (Yes), the process proceeds to S210 via S200. On the other hand, when it is determined in S195 that the average value m (= h) of the detected current in the fifth cycle is equal to or less than the upper limit threshold e (No), the process proceeds to S196.

  That is, when it is determined in S195 that the average value m (= h) of the detected current in the fifth cycle is larger than the upper limit threshold e (Yes), the pattern detecting unit 73a of the determining unit 72b “1” is set as the bit value corresponding to the fourth bit (first bit section of the character bit), that is, the operation data of the storage unit 74 is associated with “1” as the bit value of the fourth bit of the signal current. Store in the storage unit 74b (S200).

  On the other hand, if it is determined in S195 that the average value m (= h) of the detection current in the fifth cycle is equal to or lower than the upper limit threshold e (No), the pattern detection unit 73a of the determination unit 72b detects the current detection. It is determined whether the current signal current is the signal current of the first character (S196). The determination in S196 is performed in the same manner as in S176.

  If it is determined in step S196 that the first character is not the first character (No), the process proceeds to step S210 via step S197. On the other hand, if it is determined in S196 that the first character is “Yes”, the process returns to S110 via S198.

  That is, if it is determined in S196 that the character is not the first character, “0” is set as the bit value corresponding to the fourth bit of the signal current (the first bit section of the character bit), that is, the signal current The bit value of the fourth bit is associated with “0” and stored in the operation data storage unit 74b of the storage unit 74 (S197).

  On the other hand, if it is determined in S196 that the character is the first character, the pattern detection unit 73a of the determination unit 72b determines the average value of the detection current in the fifth cycle as the average value m of the detection current in the first cycle. (S198), and the operations from S110 to S195 are repeated again.

  In S200 or S197, when “1” or “0” is set as the bit value corresponding to the fourth bit of the signal current, that is, the first bit section of the character bit, the pattern detection unit 73a of the determination unit 72b performs the process of S210. Perform the character conversion process.

  In S210, the pattern detection unit 73a of the determination unit 72b reads out the measurement data (see FIG. 8 [Waveform 3]) stored in the operation data storage unit 74b, and (5 + n) cycles (where n is 1 to 6). The average value x of the detected currents is measured. The character conversion process will be described with reference to FIG.

  In the character conversion step, the pattern detection unit 73a of the determination unit 72b first sets n to 1 (S215). After setting n to 1, the pattern detection means 73a measures the detected current in the 5 + n period, that is, the sixth period, and calculates the average value m (= x) (S220). When the determination unit 72b calculates the average value m of the detection current in the sixth cycle, in response to this, the determination unit 72b reads the upper limit threshold value e from the operation data storage unit 74b, and the average value m of the detection current in the sixth cycle is the upper limit threshold value. It is determined whether it is larger than e (S225).

  If it is determined in S225 that the average value m of the detected current in the sixth cycle is greater than the upper threshold e (Yes), the process proceeds to S240 via S230. On the other hand, if it is determined in S225 that the average value m of the detected current in the sixth cycle is equal to or less than the upper threshold e (No), the process proceeds to S240 via S235.

  That is, when it is determined in S225 that the average value m of the detected current in the sixth cycle is larger than the upper limit threshold e, the pattern detecting unit 73a of the determining unit 72b determines the fourth + nth bit of the signal current, that is, the first “1” indicating that there is a unit current is set as the bit value corresponding to the fifth bit, that is, the operation data storage unit of the storage unit 74 is associated with “1” as the bit value of the fifth bit of the signal current. 74b is stored (S230).

  On the other hand, when it is determined in S225 that the average value m of the detected current in the sixth cycle is equal to or lower than the upper limit threshold e, the pattern detection unit 73a of the determination unit 72b determines the fourth + nth bit of the signal current, that is, “0” indicating that there is no unit current is set as the bit value corresponding to the fifth bit, that is, the operation data stored in the storage unit 74 is associated with “0” as the bit value of the fifth bit of the signal current. The data is stored in the part 74b (S235).

  When a bit value corresponding to the fifth bit of the signal current is set in S230 or S235, in response to this, the pattern detection means 73a of the determination unit 72b adds 1 to n (S240).

  In response to adding 1 to n, the pattern detection unit 73a of the determination unit 72b determines whether the value n after adding 1 is larger than 6 (S245).

  If it is determined in S245 that n is greater than 6 (Yes), the process proceeds to S250. On the other hand, if n is determined to be 6 or less (No), S220 is performed again. S220 to S245 are repeated until n becomes larger than 6.

  As shown in FIG. 8, the detection currents in the sixth to eleventh periods are the fifth to tenth bit intervals of the combined current composed of both the general load current and the signal current. In the example shown in FIG. 8, the detected currents in the sixth, eighth, ninth, and eleventh periods (that is, the combined current including the signal current components in the fifth, seventh, eighth, and tenth bit sections). The average value x is 7 amperes, and the average value x of the detection currents in the 7th and 10th cycles (that is, the combined current including the signal current components in the 6th and 9th bit sections) is 5 amperes. Therefore, in the example shown in FIG. 8, the pattern detection unit 73 a of the determination unit 72 b detects the detected currents in the sixth, eighth, ninth, and eleventh periods (that is, the fifth, seventh, eighth, and tenth bit sections). 7 amperes is measured as the average value x of the combined current including the signal current component), and the detected current in the 7th and 10th cycles (that is, the combined current including the signal current component in the 6th and 9th bit sections) As an average value x, 5 amps are measured.

  When it is determined in S245 that n is larger than 6, the character signal specifying unit 73b of the determination unit 72b performs an odd parity check in response to this (S250).

  In S250, the character signal specifying unit 73b determines whether or not the number of Qs from the second bit to the ninth bit is an odd number. If Q is an odd number, that is, if the odd parity is correct (Yes), the process proceeds to S255. On the other hand, if Q is an even number, that is, if the odd parity is not correct (No), the process proceeds to S270.

  If it is determined in S250 that the odd parity is correct, the character signal specifying unit 73b of the determination unit 72b performs an inverted parity check in response to this (S255).

  In S255, the character signal specifying unit 73b determines whether the values of the ninth bit and the tenth bit are inverted, that is, one of them is “1” and the other is “0”. Determine. If the value is inverted, that is, if the inverted parity is correct (Yes), the process proceeds to step S260. On the other hand, if the ninth bit and the tenth bit have the same value, that is, if the inverted parity is incorrect (No), the process proceeds to S270.

  In step S260, the character signal specifying unit 73b reads the bit value of the signal current in the third to ninth bits from the operation data storage unit 74b, and converts the bit pattern composed of the read bit values into the reference data. It is compared with the reference configuration pattern in the section from the third bit to the ninth bit read from the storage unit 74a and converted into corresponding character data (hereinafter simply referred to as “character”). By this collation, it is determined whether or not the bit pattern of the signal current matches any of the numbers “0 to 9” and minus “−”, and the character associated with the bit pattern is specified. The character signal specifying unit 73b of the determination unit 72b associates the converted character and the bit pattern and stores them in the operation data storage unit 74b as digital data (S265).

  If it is determined in the above-described determination of S265 that the converted character matches any of the numbers “0-9” and minus “−” (Yes), the process proceeds to S275, and the converted character is If it is determined that neither the number “0-9” nor the minus “−” is met, the process proceeds to S275 via S270.

  In other words, when it is determined in S265 that the converted character matches any of the numbers “0-9” and minus “−”, the character signal specifying unit 73b of the determination unit 72b converts the converted character. Is stored in the detection code storage unit 74c of the storage unit 74 as digital data (S275). On the other hand, if it is determined in S265 that the converted character does not match any of the numbers “0-9” and minus “−”, the character signal specifying unit 73b of the determination unit 72b converts the converted character. A character “?” Representing an unknown character is associated with the character (S270). Thereafter, the code “?” Representing the unknown character is stored as digital data in the detection code storage unit 74c of the storage unit 74 (S275).

  In the conversion process to the character, the character signal is specified for all of the M characters constituting the above-described inspection signal, and the detection code storage unit 74c is formed as a character string including the M converted characters. Stored in At this time, if there is a previously converted character string, the converted character is the second and subsequent character strings of the code, so the converted character is added after the previously converted character string. And stored in the detection code storage unit 74c of the storage unit 74. Thereafter, the process proceeds to S280. In this way, the accumulated character string is detected as digital data corresponding to the already-described inspection signal from the above-described unit current appearance pattern.

  After the character conversion is performed in S210 (S215 to S275), the code acquisition means 73c of the determination unit 72b is a bit of the inspection signal made up of M N-bit character signals stored in the detection code storage unit 74c. While reading the pattern, the character reference bit pattern corresponding to the M-digit character constituting the input code is read from the reference data storage unit 74a, and the M-digit code is obtained by collating both bit patterns.

  When the converted character is stored in the detection code storage unit 74c of the storage unit 74, the code acquisition unit 73c of the determination unit 72b reads and reads the character string stored from the detection code storage unit 74c. It is determined by checking the bit pattern whether or not the obtained character string has 5 (M = 5) digits (S280).

  If it is determined in S280 that the read character string is 5 digits (Yes), the process returns to S105 via S290, and it is determined that the read character string is not 5 digits (No). If so, the process returns directly to S105.

  That is, when it is determined in S280 that the read character string is 5 digits, the display control unit 72c reads the character string stored from the detection code storage unit 74c in response to this. The read character string is output to the display 66 together with the number of inspection signal receptions. As a result, the display 66 displays a character string corresponding to the number of inspection signal receptions (S290). Thereafter, the process proceeds to S105.

  After S280 or S290, the determination unit 72b resets the detection current in the 12th cycle, which is the next cycle, to the detection current in the 1st cycle, and repeats the same operation, that is, the operations in S105 to S290 again. .

  If it is determined in S280 that the read character string is not five digits, the following steps S281 to S283 may be performed.

  After the determination of S280, one cycle, that is, the section of the 12th cycle that is the next cycle is delayed, and the detection current of the 13th cycle that is the next cycle is measured as the detection current of the first cycle, The average value m is calculated (S281). When the pattern detection means 73a of the determination unit 72b calculates the average value m of the detection current in the first cycle, in response to this, the lower limit threshold c and the upper limit threshold e according to the above equations (2) and (3). Is set (S282).

  The pattern detection unit 73a of the determination unit 72b reads the measurement data stored in the operation data storage unit 74b in response to the setting of the lower limit threshold c and the upper limit threshold e, and calculates the average value m of the detection current in the second cycle. calculate. The detection current in the second cycle is a section corresponding to the start bit, and includes both general load current and signal current components. Therefore, the pattern detecting unit 73a searches for the zero cross at the end of the second period and finely adjusts the measurement timing (S283). In S283, after fine adjustment of the measurement timing, the process proceeds to S150.

  In this way, the receiver 60 acquires the code from the combined current flowing through the power supply wiring Wi and displays it on the display 66.

  By the way, a receiver according to a conventional wiring path inspection system (hereinafter referred to as “conventional receiver”) has a “signal” with respect to the combined current, even though the combined current is a current including a signal current component. There was an inconvenience that sometimes it was determined that there was no current. Hereinafter, this inconvenience will be described with reference to FIG.

  That is, the general load current may decrease in a section between characters. For example, in the example shown in FIG. 9, the general load current shown as “waveform 1” has an average value of 5 amperes in the bit sections 1 to 11, whereas the average value in the bit section 12 and later is the average value. It is 3 amps. For this reason, the combined current shown as “waveform 3” has an average value of 5 amperes in the bit period 14 and thereafter, even though it is a current including a signal current component. In such a case, in the case of a conventional receiver, since the average value of 5 amperes of the combined current is equal to or less than the threshold value of 6.2 amperes, it is determined that there is no signal current with respect to the combined current. . Therefore, in such a case, the conventional receiver determines that “there is no signal current” with respect to the combined current even though the combined current is a current including a signal current component.

  Therefore, in the embodiment of the present invention, the following measures are taken so that such a determination is not made, thereby improving the reception accuracy of the receiver 60.

  That is, in the embodiment, the pattern detection unit 73a of the determination unit 72b is generally measured in a section between characters (in the example shown in FIG. 9, a section corresponding to two periods of the bit sections 12 and 13). The threshold value (upper limit threshold value) is reset or changed to a new value (here, “4 amps”) in units of characters with reference to the average value of the load current (here “3 amps”). .

  Specifically, in the embodiment, the reference data storage unit 74a of the storage unit 74 stores a virtual average value (here, “2 amps”) of the signal current in advance, and the pattern of the determination unit 72b. The detecting means 73a calculates an average value (in this case, “3 amperes”) of the general load current in a section between characters (in the example shown in FIG. 9, two periods of the bit sections 12 and 13). When measuring, the virtual average value of the signal current (“2 amps”) is read from the reference data storage unit 74a, and the virtual average of the signal currents read to 3 amps of the measured average value of the general load current Add 2 amperes of value. Thereby, the pattern detection means 73a calculates a value of “5 amperes” as a virtual average value of the combined current including both the components of the general load current and the signal current, and both the components of the general load current and the signal current are calculated. When the virtual average value (here, “5 amperes”) of the combined current including the current is calculated, the average value of the general load current (here, “3 amperes”), the general load current and the signal A new threshold value is determined between the virtual average value (here, “5 amperes”) of the combined current including both components of the current. Specifically, it is an intermediate value between “3 amperes” of the peak value of the general load current and “5 amperes” of the virtual average value of the combined current including both the components of the general load current and the signal current. Ampere "is determined as a new threshold. When the pattern detection unit 73a determines a new threshold value, in response to this, the determined new threshold value is compared with the old threshold value (here, “5 amps”) stored in the reference data storage unit 74a. (Here, “4 amps”) is overwritten. Thereby, the receiver 60 resets and changes the threshold value to a new value.

  Thus, in this embodiment, the average value of the general load current (here, the receiver 60) is measured at a predetermined interval between characters (here, two periods). , “3 amps”) as a reference, the threshold value is reset to a new value (here, “4 amps”) in character units. As a result, the receiver 60 is also able to generate a combined current including a general load current whose average value is smaller than the value of the previous character (here, a combined current after the bit section 14 shown in FIG. 9). It can be determined that “signal current is present”. Therefore, this embodiment can reduce the frequency of occurrence of reception errors, thereby improving the reception accuracy.

  In the above description, the new threshold has been described as 4 amps. However, strictly speaking, the pattern detection unit 73a of the determination unit 72b may set the new threshold as follows.

  That is, the pattern detection means 73a of the determination unit 72b calculates the average value of the detected currents first measured after the power is turned on (here, the current value “5 amperes” of the combined current in the first cycle shown in FIG. 9). The average value a of the general load current is stored in the operation data storage unit 74b of the storage unit 74. The pattern detecting unit 73a calculates the lower threshold c = a × 1.0 = 5.0 amperes, and stores the lower threshold c in the storage unit 74 (specifically, the operation data storage unit 74b). Further, the pattern detection means 73a calculates the upper limit threshold e = (a + b × 0.6) = (5.0 + 2 × 0.6) = 6.2 amperes, and stores the upper limit threshold e in the operation data of the storage unit 74. Stored in section 74b. Further, the pattern detecting means 73a applies a lower limit threshold c with a value of “5.0 amperes” and an upper limit with a value of “6.2 amperes” to the first one-character composite current waveform. By using the threshold value e, the section of the combined current consisting only of the components of the general load current and the section of the combined current consisting of both the components of the general load current and the signal current are distinguished.

  Here, in the section between the characters, the average value of the general load current decreases, and the average value of the combined current composed of only the components of the general load current is less than 5.0 ampere, which is the lower limit threshold c. Suppose. For example, as shown in FIG. 9, it is assumed that the average value of the combined current composed of only the general load current is 3 amperes in the bit section 12 and the bit section 13. In this case, the pattern detection unit 73a of the determination unit 72b recalculates the lower limit threshold c, and a new value (specifically, c = 3 × 1.0) = 3.0 amperes) is stored in the storage unit 74. The data is stored in the operation data storage unit 74b. Similarly, the pattern detection means 73a also recalculates the upper threshold e and sets a new value (specifically, e = (3 + 2 × 0.6) = 4.2 amps) in the operation data storage unit of the storage unit 74. 74b is stored. The pattern detection means 73a applies a lower limit threshold value c having a value of "3.0 amperes" and an upper limit threshold value e having a value of "4.2 amperes" for the waveform of the synthesized current for the next one character. Is used to divide the section of the combined current consisting only of the components of the general load current and the section of the combined current consisting of both the components of the general load current and the signal current.

  Here, in the section between the characters, the average value of the general load current increases, and the average value of the combined current composed of only the components of the general load current is 4.2 ampere or more which is the upper limit threshold e. Suppose that For example, in the bit interval 12 and the bit interval 13, it is assumed that the average value of the combined current composed of only the general load current component is 6 amperes. In this case, the pattern detection unit 73a of the determination unit 72b recalculates the lower limit threshold c, and a new value (specifically, c = 6 × 1.0) = 6.0 amperes) is stored in the storage unit 74. The data is stored in the operation data storage unit 74b. Similarly, the pattern detection means 73a also recalculates the upper threshold e and sets a new value (specifically, e = (6 + 2 × 0.6) = 7.2 amps) in the operation data storage unit of the storage unit 74. 74b is stored. The pattern detection means 73a applies a lower limit threshold value c having a value of "6.0 amperes" and an upper limit threshold value e having a value of "7.2 amperes" for the next synthesized current waveform for one character. Is used to divide the section of the combined current consisting only of the components of the general load current and the section of the combined current consisting of both the components of the general load current and the signal current.

  In this embodiment, in order to acquire a code, the presence / absence of a unit current is determined using an average value of detected currents. Although it is possible to use the peak value (maximum value) of the detected current for the determination of the presence / absence of the unit current, it may not be possible to determine the presence / absence of the unit current, such as when the load current is greatly distorted. On the other hand, if the average value of the detected current is used, the presence or absence of the unit current can be correctly determined even when the load current is greatly distorted.

(Usage example of the wiring route inspection system of the embodiment)
Below, with reference to FIG.10, FIG.11 and FIG.12, it demonstrates per usage method of the power supply wiring inspection system which concerns on embodiment. FIG. 10 is a diagram illustrating an example of display on the display 66 of the receiver 60. FIG. 11 and FIG. 12 are diagrams illustrating examples of using the system according to the embodiment.

  As shown in FIG. 10, the receiver 60 acquires a code as described above from the detected current of the combined current flowing through the power supply wiring Wi, and displays the code and the number of inspection signals received by the display control unit 72c. This is displayed on the display 66. Hereinafter, specific examples will be described.

  For example, in the example illustrated in FIG. 10, when the inspection signal is detected from the detected current for the first time, the receiver 60 receives the number “1” as the first inspection signal reception number in the first row and the first time. “101” is displayed as a code corresponding to the inspection signal. In addition, when the inspection signal is detected for the second time, the receiver 60 is “1”, which is the number of times the first inspection signal is received in the first row, and “101”, which is a code corresponding to the first inspection signal. "," 2 "is displayed as the number of times the second inspection signal is received, and" 102 "is displayed as the code corresponding to the second inspection signal. When the inspection signal is received for the third time, the receiver 60 is “1”, which is the number of times the first inspection signal is received, and “101”, which is the code corresponding to the first inspection signal. ”And the number“ 3 ”as the number of times the third inspection signal is received and“ 103 ”as the code corresponding to the third inspection signal are displayed in the second line.

  The operator can check the wiring error of the power supply wiring Wi shown in FIG. 11 or FIG. 12 by confirming such display on the display 66 of the receiver 60.

  FIG. 11 shows an example when a wiring error exists. That is, FIG. 11 shows the case where the watt-hour meter for the 101st room is connected to the power supply wiring Wi for the 102nd room and the watt-hour meter for the 102nd room is wrongly wired to the power wiring for the 101st room. An example is shown. Such an error can be detected by the operator using the transmitter 10 and the receiver 60 as follows.

  First, the operator attaches the receiver 60a to the power supply wiring Wi of the watt-hour meter Wh101 for the 101st room and sets the receiver 60b to a state waiting for reception. Similarly, the operator 60b connects the power supply wiring Wi of the watt-hour meter Wh102 for the 102nd room. Attach to, and set to the state of waiting for reception.

  Next, the operator connects the transmitter 10 to the outlet CN of the room 101 and operates the input key 14 of the transmitter 10 to input, for example, “101” which is a room number. Thereby, the transmitter 10 outputs “--101” as a code. At this time, a combined current including a signal component representing a code “−−101” is input from the power supply wiring Wi to the receiver 60b attached to the power supply wiring Wi of the watt-hour meter Wh102 for the room 102. Therefore, the display 66 of the receiver 60b displays “1”, which is the number of receptions of the first inspection signal, and “101”, which is a code corresponding to the first inspection signal, in the first line. Note that the combined current including the signal component is not input to the receiver 60a attached to the power supply wiring Wi of the watt-hour meter Wh101 for the 101st room. Therefore, the display 66 of the receiver 60a displays nothing.

  Next, the operator connects the transmitter 10 to the outlet CN of the room 102 and operates the input key 14 of the transmitter 10 to input, for example, “102” which is a room number. Thereby, the transmitter 10 outputs “--102” as a code. At this time, a combined current including a signal component representing a code “−−102” is input from the power supply wiring Wi to the receiver 60a attached to the power supply wiring Wi of the watt-hour meter Wh101 for the 101st room. Accordingly, the display 66 of the receiver 60a displays “1”, which is the number of receptions of the first inspection signal, and “102”, which is a code corresponding to the first inspection signal, in the first line. Note that the combined current including the signal component is not input to the receiver 60b attached to the power supply wiring Wi of the watt-hour meter for the room 102. For this reason, the display 66 of the receiver 60b still displays “1”, which is the number of times the first inspection signal is received, and “101”, which is a code corresponding to the first inspection signal.

  Next, the operator checks the display on the display 66 of the receivers 60a and 60b attached to the watt-hour meters Wh101 and Wh102. In the example shown in FIG. 11, the codes, that is, the room numbers, displayed on the displays 66 of the receivers 60a and 60b are different. Therefore, the operator can detect the presence of a wiring mistake (here, a mistake in wiring).

  FIG. 12 shows an example where there is a duplicate metric. That is, FIG. 12 shows an example in which the power supply wiring Wi on the power source side of the watt-hour meter Wh102 for the 102nd room is mistakenly connected to the power supply wiring Wi on the load side of the watt-hour meter Wh101 for the 101st room. Such an error can be detected by the operator using the transmitter 10 and the receiver 60 as follows.

  First, the operator attaches the receiver 60a to the power supply wiring Wi of the watt-hour meter Wh101 for the 101st room and sets the receiver 60b to a state waiting for reception. Similarly, the operator 60b connects the power supply wiring Wi of the watt-hour meter Wh102 for the 102nd room. Attach to, and set to the state of waiting for reception.

  Next, the operator connects the transmitter 10 to the outlet CN of the room 101 and operates the input key 14 of the transmitter 10 to input, for example, “101” which is a room number. Thereby, the transmitter 10 outputs “--101” as a code. At this time, a combined current including a signal component representing a code “−−101” is input from the power supply wiring Wi to the receiver 60a attached to the power supply wiring Wi of the watt-hour meter Wh101 for the 101st room. Therefore, the display 66 of the receiver 60a displays “1”, which is the number of receptions of the first inspection signal, and “101”, which is a code corresponding to the first inspection signal, in the first line. Note that the combined current including the signal component is not input to the receiver 60b attached to the power supply wiring Wi of the watt-hour meter for the room 102. Therefore, the display 66 of the receiver 60b displays nothing.

  Next, the operator connects the transmitter 10 to the outlet CN of the room 102 and operates the input key 14 of the transmitter 10 to input, for example, “102” which is a room number. Thereby, the transmitter 10 outputs “--102” as a code. At this time, the receiver 60a attached to the power supply wiring Wi of the watt-hour meter Wh101 for the 101st room and the receiver 60b attached to the power supply wiring Wi of the watt-hour meter Wh102 for the 102nd room are connected to the “− A combined current including a signal component representing a code “−102” is input. Accordingly, the display 66 of the receiver 60a displays “1”, which is the number of times the first inspection signal is received, and “101”, which is a code corresponding to the first inspection signal, on the first line. In addition, “2” that is the number of times the second inspection signal is received and “102” that is the code corresponding to the second inspection signal are displayed. On the other hand, the display 66 of the receiver 60b displays “1”, which is the number of receptions of the first inspection signal, and “102”, which is a code corresponding to the first inspection signal, in the first line.

  Next, the operator checks the display on the display 66 of the receivers 60a and 60b attached to the watt-hour meters Wh101 and Wh102. In the example shown in FIG. 12, the display 66 of the receiver 60a displays a plurality of codes, that is, room numbers. Therefore, the operator can detect that there is a wiring mistake (here, wiring overlapping connection).

  The present invention is not limited to the above-described embodiment, and various changes and modifications can be made without departing from the gist of the present invention.

  For example, the receiver 60 is preferably configured to be able to continuously receive a predetermined number of times (for example, six times) and display the information on the display 66 as appropriate. For example, the display 66 of the receiver 60 displays the code received for the first time in the first line, and the code received for the second time or later in the second line. Then, when the operator wants to check the code of the number of times of reception, the input key 64 of the receiver 60 is operated (for example, the feed button is pressed), so that the display 66 of the receiver 60 is displayed on the second line. It is assumed that the codes received from the second time to the last are repeatedly displayed. The display 66 of the receiver 60 displays the end of data such as “Data_End”, for example, by pressing the send button after the last received code is displayed. Further, the display 66 of the receiver 60 displays the code received in the first state, that is, the first received code in the first line by pressing the send button after the end of data is displayed, The code received for the second time and thereafter shall be displayed. Further, it is assumed that the display 66 of the receiver 60 erases the displayed reception count and the code corresponding to the reception count when the power switch 62 of the receiver 60 is disconnected.

  Further, the data stored in the detection code storage unit 74c of the receiver 60, that is, the code corresponding to the number of receptions, is preferably externally connected to an input / output unit 78 (not shown) such as a personal computer. It may be possible to output to the device.

  The inspection signal detection unit of the receiver according to this embodiment preferably has a signal current for changing the threshold value between the characters for a predetermined period (for example, two periods). It is recommended to provide a section that does not. Thereby, the wiring route inspection system according to this embodiment can reduce the reception error due to the change in the general load current by changing the threshold value for each character. Therefore, according to the wiring path inspection system according to this embodiment, the signal current reception accuracy can be further improved.

DESCRIPTION OF SYMBOLS 1 ... Wiring route inspection system 10 ... Transmitter 12 ... Power switch 14 ... Input key 16 ... Display (LCD)
20 ... Inspection signal generation unit 22 ... Calculation unit (CPU)
22a ... main control unit 22b ... switch circuit control unit 22c ... display control unit 24 ... storage unit (RAM)
Reference data storage unit 24b Operation data storage unit 24c Input code storage unit 26 Power source unit 28 Input / output unit R Dummy load SW Switch (triac)
60 ... Receiver 62 ... Power switch 64 ... Input key 66 ... Display (LCD)
70 ... Inspection signal detection unit 72 ... Calculation unit (CPU)
72a ... main control unit 72b ... determination unit 72c ... display control unit 74 ... storage unit (RAM)
74a ... Reference data storage section 74b ... Operation data storage section 74c ... Detection code storage section 75 ... A / D conversion section 76 ... Power supply section 78 ... Input / output section CL1, CL2, CL3 ... Voltage terminal clip (connection terminal)
CT1, CT3 ... Current transformer (connection terminal)
CN ... Outlet E ... Commercial power supply Wh ... Energy meter Wi ... Power supply wiring

Claims (8)

In a wiring route inspection system that includes a transmitter and a receiver, and inspects the route of the power supply wiring stretched around the building,
The transmitter is
(1) An input unit that can input an arbitrary code represented by M digits (where M is an integer);
(2) An inspection signal comprising character signals of M characters that are output to the power supply wiring in response to the input of the code,
The character signal is
(A) Each bit section is composed of N bits (where N is an integer) allocated to a section of one period of the commercial frequency,
(B) It is formed as a signal current including a unit current that flows intermittently in units of one cycle determined by the frequency of the commercial power source.
An inspection signal generation unit for generating the inspection signal,
The receiver is
(1) a display for displaying necessary information including the code;
(2) an inspection signal detector;
When the inspection signal detection unit is connected to the power supply wiring through which a general load current flows,
(A) detecting a current flowing through the power supply wiring as a detection current;
(B) For the detected current detected,
(I) comparing the average value of the detected currents with (ii) a threshold value determined to determine whether the detected current is a combined current of the general load current and the unit current; Detect the waveform pattern of unit current,
(C) The operation of specifying the character signal of the character corresponding to the appearance pattern from the appearance pattern of the waveform pattern of the unit current detected sequentially is performed until the specification of the character signal of the M characters is completed. Detecting the inspection signal,
(D) (i) acquiring the code of the M-digit character from the inspection signal; and (ii) displaying the acquired code on the display; and (e) detecting the waveform pattern of the unit current. Each time, the threshold value is changed to a new threshold value based on the average value of the detected currents to avoid occurrence of a waveform pattern detection failure due to fluctuations in the general load current. Wiring route inspection system. In the wiring route inspection system according to claim 1,
(1) The inspection signal generation unit starts an N-bit section of the next character by leaving a separation section composed of a predetermined number of bit sections from the N-bit section of the preceding character, and (2) the inspection signal detection section ,
(A) The threshold value is changed with reference to the average value of the detected currents in the separated section, and (b) the waveform pattern of the unit current of the next character is detected following the separated section. A wiring path inspection system characterized by comparing an average value of detected currents in a character bit section with the new threshold value. In the wiring route inspection system according to claim 1 or 2,
(1) When the character is represented by a binary code, the N bit section is composed of a start bit section representing the head of the signal current and a binary value of “1”, and a predetermined number of bit sections. A wiring route inspection system comprising: a separation bit section whose binary value is “0” and a character bit section representing a bit string corresponding to the character in a 6-bit section. In the wiring route inspection system according to claim 3,
The N-bit section further includes an odd parity bit section of a predetermined number of bit sections between the start bit section and the separation bit section. In the wiring route inspection system according to claim 3 or 4,
The N-bit section further includes an inverted parity bit section of a predetermined number of bit sections. In the wiring route inspection system according to claim 4 ,
The N bit interval further includes an inverted parity bit interval of a predetermined number of bit intervals,
The N bit section includes the start bit section of the first bit, the odd parity bit section of the second bit, the separation bit section of the third bit, and the characters of the fourth to ninth bits. A wiring path inspection system comprising a bit section and a 10-bit section consisting of the inverted parity bit section of the 10th bit. In the wiring route inspection system according to any one of claims 1 to 6,
The inspection signal generation unit corresponds to a symbol meaning that the missing character is “not input” when the number of characters constituting the M-digit character of the code is less than a predetermined number of M characters. A wiring path inspection system characterized by forming and outputting attached character signals for the number of missing characters. In the wiring route inspection system according to any one of claims 1 to 6,
The inspection signal generation unit includes a storage unit that stores the number of acquisitions of the code in association with the acquired code, and the number of acquisitions read from the storage unit and the code associated therewith Is displayed on the display.