JPH10256953A - Device for inspecting power line - Google Patents

Abstract

PROBLEM TO BE SOLVED: To surely and easily attain the inspection of a power line installation situation by detecting a signal for test by a contactless connecting means, and displaying the possibility of signal transmission when the detected signal is more than signal intensity decided is advance. SOLUTION: A signal generating device 1 is connected with a power line 3 in an arbitrary system in a distribution board 7 of an electric chamber, and the connection is defined as C. Also, a detecting device 4 is connected with either a connection candidate (a) point or (b) point or both points with the power line 3 installed in the neighborhood of an equipment by using a coupler 6. Then, a signal for test is detected by this coupler 6, and when the detected detection signal is more than prelimiarily decided signal intensity, the detecting device 4 displays the possibility of signal transmission. Thus, at the time of setting an equipment using power line carriage, the inspection of the power line installation situation can be surely and easily retrieved without reconstructing a drawing or the like. Moreover, non-contact retrieval can be attained without directly connecting a meter or the like with the power line to which a power source is impressed, and danger such as electric shock can be avoided.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus for examining the communication quality of a power line when constructing a terminal or the like in a power line carrier system using a power line as a medium, and examining whether or not it can be used for information transmission.

[0002]

2. Description of the Related Art In general, there is a control device described in Japanese Patent Application Laid-Open No. 60-200736 as a control device which superimposes a control signal on an indoor power line and controls a load connected to the power line with the control signal. This will be described with reference to FIG. 71 is an AC power supply, 3 is a power line laid indoors, 7
3 is a central control unit, and 74 is a power line 3 connected to the central control unit.
A current detection unit for inputting a load current signal flowing to the central control unit 73. Reference numerals 75 and 76 denote indoor load control devices having loads 77 and 78, respectively.

[0003] Next, the operation of the control device configured as described above will be described. The current flowing through the loads 77 and 78 of the indoor load controllers 75 and 76 is obtained by detecting the current flowing through the power line 3 by the current detector 74.
The central control unit 73 controls the indoor load control device 75 or the indoor load control device 7 according to the current detected by the current detector 74.
A control signal is superimposed on the power line 3 and transmitted to 6 to control the operating states of the loads 77 and 78.

[0004]

In the conventional control device as described above, the central control unit 73 and the indoor load control device 75,
As shown in the figure, the laying state of the power line 3 connecting the devices 76 is clear, and the operation of the device is performed without any problem. However, the actual laying state of the indoor power line 3 may vary depending on whether various loads are connected or in some cases. It was often complicated, for example, a circuit breaker was inserted and branched on the way.
Especially when superimposing the control signal on the power line, the control signal may not be transmitted if the state of the load connected to the power line is unclear, and the power line is physically disconnected due to branching by a circuit breaker etc. In some cases, the control signal cannot be transmitted smoothly, and the operation of the device may be disabled.

[0005] Also, the actual power line laying status is investigated,
After confirming that control signals can be transmitted reliably, it is necessary to install the device. Such a survey can be performed by confirming signal injection and reception between transmission points. However, in practice, a measuring instrument or the like is directly connected to the power line 3 to which the AC power is applied. It involves dangers such as electric shock. As a risk avoidance measure, it is conceivable to measure by turning off the power supply.However, it is difficult due to a power failure in a building in operation, and the transmission characteristics of the power line may be different from the actual because the load does not operate. Transmission could not be evaluated.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-described problems. When installing equipment using power line carrier, an available indoor power line is reliably and easily searched.
An object of the present invention is to obtain a power line exploration device for grasping a laying state of an indoor power line.

[0007]

SUMMARY OF THE INVENTION A power line exploration apparatus according to the present invention generates a test signal of a predetermined format and injects the signal into a power line, and non-contact coupling means for non-contact coupling with the power line. And a detection device for detecting the test signal by the non-contact coupling means, and displaying that signal transmission is possible if the detected detection signal is equal to or higher than a predetermined signal strength.

A signal generator for intermittently generating a test signal of a predetermined format according to a predetermined time and injecting the test signal into a power line, non-contact coupling means for non-contact coupling with the power line, When the predetermined time is reached, the non-contact coupling means detects the test signal, stores the detected time and the strength of the detected detection signal, and the strength of the detection signal is predetermined. And a detection device that displays that the signal can be transmitted if the signal strength is equal to or higher than the detected signal strength and displays the strength of the detection signal in accordance with the time.

In addition, a test signal of a predetermined format is generated intermittently according to a predetermined time, injected into a power line, and a predetermined switching signal is generated when the test signal is intermittently generated. Causes
A signal generating device to be injected into a power line, a non-contact coupling unit that non-contact-couples with the power line, and when the switching signal is detected from the non-contact coupling unit, the test signal is detected, and the detected time. A detection device that stores the strength of the detected detection signal, displays that the signal can be transmitted if the strength of the detection signal is equal to or higher than a predetermined signal strength, and displays the detection signal corresponding to the time. Is provided.

The test signal generated by the signal generator can be selected according to the signal system used for power line carrier.

Further, the signal generating device includes a non-contact coupling means for coupling to the power line in a non-contact manner and injecting a signal into the power line.

A transmission control means for controlling the transmission of the signal; a signal generation means for generating a test signal of a format predetermined by the signal selection means in accordance with a command from the transmission control means; and a signal for injecting the test signal into a power line. A signal generator having an injection means, a non-contact coupling means for non-contact coupling with the power line, and converting the test signal detected by the non-contact coupling means into a signal strength, wherein the signal strength is predetermined. A measurement control unit that outputs a signal indicating whether signal transmission is possible in comparison with the signal intensity, a transmission determination display unit that displays whether signal transmission is possible by the signal indicating whether signal transmission is possible, and a detection device that includes a level meter that indicates the signal intensity. Is provided.

Transmission control means for controlling signal transmission based on the output signals of the timer operation switch and the clock means;
In accordance with a command from the transmission control means, there are provided signal generation means for generating a test signal of a format predetermined by the signal selection means intermittently according to a predetermined time, and signal injection means for injecting the test signal into a power line. Having a signal generation device, non-contact coupling means for non-contact coupling with the power line, after turning on a timer measurement switch, when the time by the signal generation clock means has reached the predetermined time, The non-contact coupling means detects a test signal, converts the detected test signal into a signal strength, and outputs a signal indicating whether or not signal transmission is possible by comparing the signal strength with a predetermined signal strength. After performing the measurement for the predetermined time, the measurement control means for stopping the measurement operation, and the signal intensity and the time of detection are recorded. Storage means for performing, a display for displaying the signal strength corresponding to the detected time, a transmission determination display means for displaying whether or not signal transmission is possible based on the signal for signal transmission permission, and a level meter for displaying the signal strength. Device.

Transmission control means for controlling signal transmission based on the output signals of the timer operation switch and the clock means;
In accordance with a command from the transmission control means, a signal generation means for intermittently generating a test signal of a format predetermined by the signal selection means according to a predetermined time, and a switching signal indicating test start or stop are generated. A signal generator having a switching signal generating means and a signal injecting means for injecting the test signal and the switching signal into a power line, a non-contact coupling means for non-contact coupling with the power line, and a timer measurement for turning on / off a timer measurement A switch, a detection clock means for outputting time information, a switching signal detection means for detecting the switching signal, and the detection signal when the switching signal indicating the start of the test is detected by the switching signal detection means. A test start time is set in a clock means, the test signal is detected by the non-contact coupling means, and the detected test signal is Signal control, the signal strength is compared with a predetermined signal strength, a signal indicating whether or not signal transmission is possible is output, and measurement is performed for the predetermined time, and then measurement control is stopped. Means, storage means for storing the signal strength and the time of detection,
A display device for displaying the signal strength corresponding to the detected time, a transmission determination display means for displaying whether or not signal transmission is possible by the signal for signal transmission availability, and a detection device having a level meter for displaying the signal strength. .

Further, the signal injection means includes a non-contact coupling means which is connected to the power line in a non-contact manner and injects a signal into the power line.

[0016]

BEST MODE FOR CARRYING OUT THE INVENTION

Embodiment 1 FIG. Generally, the central control unit of the equipment is often installed near a power distribution board such as an indoor electric room. Therefore, it is relatively easy to connect a signal generator directly to a power line in an electric room. However, in the vicinity of the equipment to be monitored, there is no equipment for easily making electrical connections such as a distribution board, and the communication quality is the best even if a number of candidate points for connecting the power line communication device are selected. It is difficult to directly connect and select parts.
The first embodiment has a configuration in which an investigation is performed with the point where communication is performed from a point near the distribution board to a place where equipment is installed.

Hereinafter, a first embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a configuration diagram of a first embodiment of the present invention when an indoor wiring survey is performed using a power line exploration apparatus. Reference numeral 7 denotes a distribution board, and reference numeral 3 denotes a branch in the distribution board by a circuit breaker 2. The power line is connected to the monitoring target facility 2, lighting, a general outlet, and the like to supply power. Reference numeral 1 denotes a signal generator, which is connected to the power line 3. The power line 3 runs along the indoor ceiling, wall, etc.
The power supply is laid as a power supply for the monitoring target facility 5 and a power supply for electric devices in the vicinity thereof. The power line 3 may be the same or different from the power supply system to which the signal generator 1 is connected. Reference numeral 4 denotes a detection device that detects a signal generated by the signal generation device 1 from the power line 3 via the coupler 6.

FIG. 2 is a diagram showing an example of the external appearance of the signal generator 1. Reference numeral 1a denotes a signal generation switch for turning on and off the generation of a test signal.
A test signal is output. Turn off the signal generation switch 1a
When the test signal is tilted to the f side, the test signal stops. Reference numeral 1c denotes a signal generation indicating lamp indicating that the test signal is being output to the power line connection terminal 1e. Reference numeral 11a denotes a signal selection unit that selects a test signal format according to a signal format used for data communication.

FIG. 3 is a block diagram showing the configuration of the signal generator. Reference numeral 10 denotes a transmission control means for controlling transmission of a signal, to which a signal generation switch 1a is connected. 11 is a signal generating means for generating a signal having the same frequency distribution as a signal used in power line carrier, and 11a is a signal generating means 1
1 selects the type of signal generated. Numeral 12 is a signal injection means such as a transformer and a power amplifier having an impedance matching with the power line 3 and a signal amplification function.

FIG. 4 is an external view of the detecting device 4. 44 is a level meter for displaying the level of the detected test signal.
0 determines the level of the currently received test signal,
An LED (a) and an LED (b) for displaying the determination result are provided. Reference numeral 6 denotes a coupler that performs electromagnetic or electrostatic coupling with the power line 3 and performs non-contact coupling. It is connected to a strong electric part such as an exposed part in a non-contact manner, and the first embodiment shows a clip type.

FIG. 5 is a diagram showing the configuration of the detection device 4.
Is a measurement control means, and a signal detected by the coupler 6 is input via the amplifier 41. A level meter 44 indicates the level of the detected test signal. 49, 50
Reference numeral denotes a display which is transmission determination display means such as an LED which indicates the result of the transmission availability determination by comparing the test signal level currently being measured with a predetermined value.

Next, the operation will be described with reference to FIGS. Two power lines 3 are laid near the equipment 5 to be monitored.
A method of power line exploration when points a and b are candidates for connection will be described. Here, it is assumed that a control device is installed in an electric room and a control signal is communicated with a remote place indoors, for example, an air conditioner installed on a rooftop.

First, as shown in FIG. 1, the signal generator 1 is connected to an arbitrary system power line 3 in a distribution board 7 in an electric room. This connection point is referred to as point c. On the other hand, the detector 4 is coupled to one or both of the power line connection candidates a and b of the power line 3 laid in the vicinity of the facility by using the coupler 6. At this time, the state of laying the power line 3 between the point c and the points a and b is unknown, and it is not possible to determine which power line should be used to monitor the monitored facility.
Since the coupler 6 performs electromagnetic or electrostatic coupling, it may be connected to only one of the power lines 3.

Next, the signal generating switch 1a of the signal generating apparatus 1 shown in FIG.
Inject into The injected test signal is transmitted via the power line 3,
It is transmitted to each indoor system.

Next, the operation of the signal generator 1 will be described with reference to FIG. First, the signal selection unit 11a is set in advance so that a test signal of a predetermined format is output according to a signal format used for data communication. When the signal generation switch 1a is turned on, the transmission control means 10 instructs the signal generation means 11 to generate a signal, and outputs a signal transmission display LED.
1c is turned on. From signal generating means 11 to signal selecting means 1
The test signal generated in a predetermined format by 1a is amplified to a predetermined intensity by the signal injection means 12 and injected into the power line 3 via the power line connection terminal 1e.

When a signal injected between any two wires is transmitted, the impedance coupled to each wire, for example, the capacitance between the ground and the like, is not always the same depending on the surrounding environment.
In particular, in a cable such as a power cable that is not intended to be used for communication, impedance non-parallelism occurs, and as a result, signal leakage occurs outside the power line cable.

A connection candidate point a or b on the power line 3
If the test signal is transmitted also at the point, signal leakage has occurred. The leakage signal is detected by the detecting device 4 via the coupler 6 from the points a and b. Specifically, a test signal received as leakage of a test signal that is electromagnetically induced or electrostatically coupled by the coupler 6 shown in FIG. 5 is amplified at a predetermined magnification by the amplifier 41 and input to the measurement control means 40. You.

Hereinafter, the operation of the detection device 4 will be described with reference to the flowchart shown in FIG. In the measurement control means 40, the detected test signal is referred to a pre-established conversion table of the strength of the leak signal corresponding to the signal strength on the power line (step S1), and converted into signal strength data (step S2). . The measurement control means 40 displays the signal strength on the level meter 44 based on the signal strength data (step S3), and also compares the signal strength data with comparison data predetermined in a communicable range (step S4). LED (a) when data is more than
49 is turned on, and the LED (b) 50 is turned off (step S).
5) Display that transmission is possible. If the signal strength is lower than the comparison data, the LED (b) 50 is turned on and the LED (a) 49 is turned off (step S6) to indicate that transmission is not possible.

According to the above procedure, the points a and b of the power line 3 near the equipment shown in FIG. 1 are investigated, and connection work of the power line carrier equipment is performed at any of the transmittable points.

As described above, when installing the equipment using the power line carrier, it is possible to reliably and easily search for the power line laying state without reconstructing the drawings and the like. It is possible to conduct a non-contact search without directly connecting an instrument or the like to the power line to which the signal is applied, and to avoid danger such as electric shock. Therefore, it is possible to grasp the communication state while the electric equipment is operating without disconnecting the AC power supply applied to the power line, so that the installation work of the equipment can be performed with high reliability. Adjustment period can be shortened.

Embodiment 2 In the second embodiment, a timer function is provided in the power line search device described in the first embodiment, and a trend is measured by a timer operation. Less than,
Embodiment 2 of the present invention will be described with reference to the drawings. In addition,
In the figure, the same reference numerals as those in the first embodiment denote the same or corresponding components, and a description thereof will be omitted. 7 is an external view of a signal generating device according to Embodiment 2 of the present invention, FIG. 8 is a structural diagram of the signal generating device, FIG. 9 is an external view of the detecting device, and 10 is a structural diagram of the detecting device.

In FIG. 7, reference numeral 1b denotes a timer switch for turning on and off the timer operation. When the switch is turned on, the signal is stopped at a predetermined time for a predetermined period, the test signal is continuously stopped for a predetermined time, and then the test signal is turned on again. An operation such as outputting is repeated. 1d is a time display.

In FIG. 8, reference numeral 14 denotes time measuring means for notifying the time to the sending control means and displaying the current time on the time display means 1d.

In FIG. 9, reference numeral 45 denotes a display device for displaying a test signal level at the time of automatic measurement by a timer; 46, a start switch for starting timer measurement; and 47, a time series of test signal levels stored by timer measurement. This is a clear switch for erasing change (hereinafter abbreviated as trend) information.

In FIG. 10, reference numeral 43 denotes a time measuring means, which gives time information to the measurement control means 40. 45 is a display means for trend display of the detected signal strength, 46 is a start switch for timer measurement, 47 is a switch for clearing trend data of the test signal level, and 48 is a storage means for holding time series data of the test signal. .

Next, the operation will be described with reference to FIGS. 7 to 10 and FIG. 11 showing the operation of the signaling device 1 and FIG. First, after the timer operation switch 1b of the signal generator 1 is turned on, the signal generation switch 1a is turned on. The signal generator 1 starts operating in the timer operation mode. In this mode, a test signal is intermittently injected into the power line 3 according to a predetermined schedule.

Hereinafter, the detailed operation will be described with reference to the flowcharts showing the timer operation of the signal generator 1 shown in FIG. 9 and FIG. The timer operation switch 1b is turned on, and then the signal generation switch 1a is turned on. The transmission control means 10 reads the timer operation switch 1b and the signal generation switch 1a (step S11), and confirms that each switch is on (steps S12 and S1).
3). Further, time information is read from the time counting means 14 (step S14), and waits until a predetermined time is reached (step S15). When confirming that the predetermined time has come, the transmission control means 10 instructs the signal generation means 11 to generate a signal (step S16), and turns on the signal transmission display LED 1c (step S17). The test signal generated from the signal generation means 11 is amplified to a predetermined intensity by the signal injection means 12 and injected into the power line 3 via the power line connection terminal 1e.

When the time further advances and the transmission control means 10 detects the elapse of a predetermined time (steps S18 and S19), the signal generation means 11 is instructed to stop signal generation (step S20), and the signal transmission display LED 1c is turned on. The light is turned off (step S21). As described above, the test signal is injected from the signal generator 1 onto the power line 3 at a predetermined time and for a predetermined time by the timer switch 1b.

When a test signal is transmitted at the connection candidate point a or b on the power line 3 as in the first embodiment, signal leakage occurs. This leakage signal is detected by the detection device 4 installed at the points a and b. In the present embodiment, the detection device 4 sets the timer measurement start switch 46 to o
At a predetermined time, test signal detection and storage are performed, measurement is performed for a predetermined time, and then the measurement operation is stopped.

FIG. 10 and FIG.
The operation will be described based on a flowchart showing the timer operation of the measurement control means 40 of the detection device 4 shown in FIG. First, the measurement control means 40 sets the timer measurement start switch 4
6 is turned on (step S30), and the time information is read from the timer 43 (step S3).
1) It is determined that a predetermined time synchronized with the signal generator 1 has come (step S32). At this time, the test signal received by the coupler 6 as a leak of the test signal which is electromagnetically induced or electrostatically coupled is amplified by the amplifier 41 at a predetermined magnification and input to the measurement control means 40.

The measurement control means 40 refers to the conversion table of the strength of the leak signal corresponding to the signal strength on the power line, which is constructed in advance, based on the detected test signal (step S3).
3) This is converted into signal strength data (step S3)
4). The measurement control means 40 displays the signal strength on the level meter 44 based on the signal strength data (step S35).
At the same time, it is stored in the storage means 48 (step S3
6). Further, comparison is performed with comparison data determined in advance in a communicable range (step S37). If the signal strength data is equal to or greater than the comparison data, the LED (a)
49 is turned on, and the LED (b) 50 is turned off (step S3).
8) Display that transmission is possible.

Next, when the signal strength is less than the data value for comparison, the LED (a) 49 is turned off and the LED (b) 50 is turned on (step S39) to indicate that transmission is impossible. In addition, as shown in FIG.
The signal level trends are sequentially displayed (Step S4)
0).

Next, the measurement control means 40 reads the time information from the time measurement means (step S41), and confirms that a predetermined time has elapsed (step S42).
Then, the operation of displaying the data in the storage unit 48 and storing the data in the storage unit 48 is stopped (step S43).

Thereafter, each time a predetermined time elapses, the above operation is repeated, and a signal strength trend on the power line is measured.

Since the electric characteristics of the power line change in a time-series manner according to the operating conditions of the connected electric equipment, the intensity of the control signal transmitted through the power line changes with time. Can be measured,
It becomes possible to know the transmission stability, and it is possible to select a connection point with higher accuracy.

Embodiment 3 In the third embodiment, a switching signal function is provided in the signal generator 1 of the power line exploration apparatus described in the first embodiment, and trend measurement is performed using the switching signal. Hereinafter, a third embodiment of the present invention will be described with reference to the drawings. In the drawings, the same reference numerals as in the second embodiment denote the same or corresponding components, and a description thereof will be omitted. FIG. 13 is a configuration diagram of a signal generation device according to Embodiment 3 of the present invention, and FIG. 14 is a configuration diagram of a detection device.

In FIG. 13, reference numeral 13 denotes a switching signal generating means for switching the test signal transmission in response to a signal from the transmission control means 10, ie, generating a control signal indicating the start of the test signal transmission and the stop of the test signal transmission. It is.

In FIG. 14, reference numeral 42 denotes switching signal detection means for detecting a signal indicating switching of the test signal output from the signals detected by the coupler 6 and amplified by the amplifier 41.

Next, the operation will be described with reference to FIGS. 13 and 14 and FIG. 15 showing the operation of the signal device 1 and FIG. 16 showing the operation of the inspection device 4. First, after the timer operation switch 1b of the signal generator 1 is turned on, the signal generation switch 1a is turned on. The signal generator starts operating in the timer operation mode. In this mode, a test signal is intermittently injected into the power line 3 according to a predetermined schedule, and a switch signal having a meaning of a test signal transmission signal is generated before the test signal is generated and a switch signal having a meaning of a test signal stop signal is generated after the test signal is generated. Send out.

Hereinafter, the detailed operation will be described with reference to the flowchart showing the timer operation of the signal generator 1 shown in FIG. 13 and FIG. Turn on timer operation switch 1b
(Steps S50 and S51) Then, when the signal generation switch 1a is turned on (Step S52), the transmission control means 10 reads out the time information from the time keeping means 14 (Step S53) and waits until a predetermined time is reached. . When confirming that the predetermined time has come (step S54), the transmission control means 10 instructs the switching signal generation means 13 to output a control signal for generating a test signal (hereinafter simply referred to as a test start signal). (Step S55), the test start signal is amplified to a predetermined strength by the signal injection means 12, and is output to the power line 3 via the power line connection terminal 1e.

Next, after the generation of the test start signal, the transmission control means 10 instructs the signal generation means 11 to generate a signal (step S56) and turns on the signal transmission display LED 1c (step S57). The test signal generated from the signal generation means 11 is amplified to a predetermined intensity by the signal injection means 12 and injected into the power line 3 via the power line connection terminal 1e. Thereafter, the sending control means 10 sequentially reads out the time information from the time keeping means 14 (step S58) and monitors the elapse of a predetermined time (step S59).

When the time further advances and the transmission control means 10 detects the elapse of a predetermined time, it instructs the signal generation means 11 to stop signal generation (step S60) and turns off the signal transmission display LED 1c (step S61). next,
The switching signal generator 13 is instructed to output a control signal indicating that the test signal has been stopped (hereinafter simply referred to as a test stop signal) (step S62), and the test stop signal is amplified to a predetermined intensity by the signal injector 12. Then, it is output to the power line 3 via the power line connection terminal 1e.

As described above, the test signal is injected from the signal generator 1 onto the power line 3 at a predetermined time and for a predetermined time by the timer switch 1b, and before and after the transmission of the test signal, a test stop signal and a test start signal are transmitted. Are output on the power line 3 respectively.

Next, when a test signal is transmitted at the connection candidate point a or b on the power line 3, signal leakage occurs. This leakage signal is detected by the detection device 4 installed at the points a and b. In the present embodiment, the detection device 4 is installed with the timer measurement start switch 46 turned on, detects and stores a test signal, performs measurement for a predetermined time, and then stops the measurement operation. . At this time, the timing means 43 of the detection device 4 operates so as to synchronize with the test start signal or the test stop signal.

Hereinafter, the operation will be described based on the flowchart of the timer operation of the measurement control means shown in FIG. 14 and FIG. First, the timer measurement start switch 46 of the detection device 4 is turned on. (Step S70). Next, the test signal received by the coupler 6 as leakage of the test signal which is electromagnetically induced or electrostatically coupled is converted into an amplifier 41.
Is amplified at a predetermined magnification and input to the measurement control means 40. When the switching signal detecting means 42 detects the test start signal from the received signals (step S71), the timer 43 is set to a predetermined measurement start time (step S72).
At the same time, the detected test signal is converted into signal strength data by referring to a conversion table of the strength of the leak signal corresponding to the signal strength on the power line, which is constructed in advance (Step S73).

Next, the measurement control means 40 displays the signal strength on the level meter 44 based on the signal strength data (step S74) and stores it in the storage means 48 (step S75). Further, comparison is performed with comparison data set in advance in a communicable range, and when the signal strength data is equal to or greater than the comparison data value, the LED (a) 49 is turned on.
The ED (b) 50 is turned off (step S77), and an indication that transmission is possible is performed. When the signal intensity is less than the comparison data value, the LED (b) 50 is turned on, and the LED (a) 4
9 is turned off (step S78) to indicate that transmission is not possible. Also, the signal level trend is sequentially displayed on the display means 45 as shown in FIG.
79).

Next, the measurement control means 40 detects a test stop signal from the received signals (step S80), stops the display on the level meter 44, and stops the data storage operation on the storage means 41 (step S81). ).

The above operation is repeated every time the test start and test stop signals are detected, and the signal strength trend on the power line is measured.

Since the electric characteristics of the power line change in a time-series manner depending on the operating conditions of the connected electric equipment, the intensity of the control signal transmitted through the power line changes with time. Can be measured,
It becomes possible to know the transmission stability, and it is possible to select a connection point with higher accuracy. In addition, the timer operation of the signal generating device and the timer operation of the detecting device can be automatically synchronized, so that the operation can be facilitated.

The test signals used in the tests in the first to third embodiments can be changed according to the signal format used by the equipment using the power line carrier.
Is changed by the signal selecting means 11a according to the equipment using power line carrier, and the power line is evaluated by the search procedure of the above embodiment.

In the first to third embodiments, the signal generator 1 is directly connected to the power line 3 of the distribution board 7. However, as a means for connecting the signal generator 1 to the power line 3, FIG. As described above, the power line laying state can be searched using the same procedure as in the first to third embodiments using the coupler 6 that is connected in a non-contact manner. At this time, the conversion table of the measurement control means 40 in the detection device 4 needs to be changed according to the signal injection method.

In the first to third embodiments, a method of searching for a power line has been described with respect to a pair of power lines. However, a signal can be obtained by using an arbitrary pair of the three power lines or between the power line and the ground. Even in the case of a device that performs transmission, a power line search can be performed in a similar procedure by changing the connection of the signal generator 1 according to the use state of the power line.

[0063]

Since the present invention is configured as described above, it has the following effects.

A signal generator for generating a test signal of a predetermined format and injecting the test signal into a power line, and non-contact coupling means for non-contact coupling with the power line are provided. A detection device that detects and detects that the detected signal is equal to or higher than a predetermined signal strength and indicates that the signal can be transmitted is provided. Can be surely and easily performed, and furthermore, a non-contact search can be performed.

A signal generator for intermittently generating a test signal of a predetermined format according to a predetermined time and injecting the test signal into a power line, non-contact coupling means for non-contact coupling with the power line, When the predetermined time is reached, the non-contact coupling means detects the test signal, stores the detected time and the strength of the detected detection signal, and the strength of the detection signal is predetermined. If the signal strength is equal to or higher than the signal strength, a signal transmission is displayed, and a detection device that displays the strength of the detection signal in accordance with the time is provided. It is possible to know the connection point of the equipment used for power line transfer with higher accuracy.

In addition, a test signal of a predetermined format is generated intermittently according to a predetermined time, injected into a power line, and when the test signal is interrupted, a predetermined switching signal is generated. Causes
A signal generating device to be injected into a power line, a non-contact coupling unit that non-contact-couples with the power line, and when the switching signal is detected from the non-contact coupling unit, the test signal is detected, and the detected time. A detection device that stores the strength of the detected detection signal, displays that the signal can be transmitted if the strength of the detection signal is equal to or higher than a predetermined signal strength, and displays the detection signal corresponding to the time. Is provided, it is possible to perform measurement using time as a parameter, it is possible to know the stability of transmission, and it is possible to select connection points of devices used for power line carrier with higher accuracy.
In addition, the timer operation of the signal generating device and the timer operation of the detecting device can be automatically synchronized, so that the operation can be facilitated.

Further, since the test signal generated by the signal generator can be selected according to the signal system used for power line carrier, a wide range of devices for power line carrier can be supported. .

Further, since the signal generating device is provided with non-contact coupling means for non-contact coupling with the power line and injecting a signal into the power line, coupling between the signal device and the power line can be facilitated.

Transmission control means for controlling signal transmission, signal generation means for generating a test signal of a format predetermined by signal selection means in accordance with a command from the transmission control means, and signal for injecting the test signal into a power line. A signal generator having an injection means, a non-contact coupling means for non-contact coupling with the power line, and converting the test signal detected by the non-contact coupling means into a signal strength, wherein the signal strength is predetermined. A measurement control unit that outputs a signal indicating whether signal transmission is possible in comparison with the signal intensity, a transmission determination display unit that displays whether signal transmission is possible by the signal indicating whether signal transmission is possible, and a detection device that includes a level meter that indicates the signal intensity. When installing equipment that uses power line transport, it is necessary to ensure that the investigation of the power line laying situation is assured and easy. It can be.

Transmission control means for controlling signal transmission based on the output signals of the timer operation switch and the clock means;
In accordance with a command from the transmission control means, there are provided signal generation means for generating a test signal of a format predetermined by the signal selection means intermittently according to a predetermined time, and signal injection means for injecting the test signal into a power line. Having a signal generation device, non-contact coupling means for non-contact coupling with the power line, after turning on a timer measurement switch, when the time by the signal generation clock means has reached the predetermined time, The non-contact coupling means detects a test signal, converts the detected test signal into a signal strength, and outputs a signal indicating whether or not signal transmission is possible by comparing the signal strength with a predetermined signal strength. After performing the measurement for the predetermined time, the measurement control means for stopping the measurement operation, and the signal intensity and the time of detection are recorded. Storage means for performing, a display for displaying the signal strength corresponding to the detected time, a transmission determination display means for displaying whether or not signal transmission is possible based on the signal for signal transmission permission, and a level meter for displaying the signal strength. With the equipment, it is possible to investigate with time as a parameter, and to know the stability of transmission,
It is possible to select connection points of devices used for power line transfer with higher accuracy.

Transmission control means for controlling signal transmission based on the output signals of the timer operation switch and the clock means;
In accordance with a command from the transmission control means, a signal generation means for intermittently generating a test signal of a format predetermined by the signal selection means according to a predetermined time, and a switching signal indicating test start or stop are generated. A signal generator having a switching signal generating means and a signal injecting means for injecting the test signal and the switching signal into a power line, a non-contact coupling means for non-contact coupling with the power line, and a timer measurement for turning on / off a timer measurement A switch, a detection clock means for outputting time information, a switching signal detection means for detecting the switching signal, and the detection signal when the switching signal indicating the start of the test is detected by the switching signal detection means. A test start time is set in a clock means, the test signal is detected by the non-contact coupling means, and the detected test signal is Signal control, the signal strength is compared with a predetermined signal strength, a signal indicating whether or not signal transmission is possible is output, and measurement is performed for the predetermined time, and then measurement control is stopped. Means, storage means for storing the signal strength and the time of detection,
A display device for displaying the signal strength corresponding to the detected time, a transmission determination display means for displaying whether or not signal transmission is possible by the signal for signal transmission availability, and a detection device having a level meter for displaying the signal strength. Therefore, it is possible to perform measurement using time as a parameter, to know the stability of transmission, and to select connection points of devices used for power line carrier with higher accuracy. In addition, the timer operation of the signal generating device and the timer operation of the detecting device can be automatically synchronized, so that the operation can be facilitated.

Further, since the signal injection means is provided with the non-contact coupling means for non-contact coupling with the power line and injecting a signal into the power line, coupling between the signal device and the power line can be facilitated.

[Brief description of the drawings]

FIG. 1 is a configuration diagram when an indoor wiring survey is performed using the power line surveying device according to the first embodiment of the present invention.

FIG. 2 is an external view showing the external appearance of the signal generator according to Embodiment 1 of the present invention.

FIG. 3 is a block diagram showing a configuration of a signal generation device according to Embodiment 1 of the present invention.

FIG. 4 is an external view showing the external appearance of the detection device according to Embodiment 1 of the present invention.

FIG. 5 is a block diagram showing a configuration of a detection device according to Embodiment 1 of the present invention.

FIG. 6 is a flowchart showing a signal measuring operation of the detection device according to the first embodiment of the present invention.

FIG. 7 is an external view showing an external appearance of a signal generator according to Embodiment 2 of the present invention.

FIG. 8 is a block diagram showing a configuration of a signal generator according to Embodiment 2 of the present invention.

FIG. 9 is an external view showing an external appearance of a detection device according to Embodiment 2 of the present invention.

FIG. 10 is a block diagram showing a configuration of a detection device according to Embodiment 2 of the present invention.

FIG. 11 is a flowchart showing a timer operation of the signal generator according to the second embodiment of the present invention.

FIG. 12 is a flowchart showing a timer operation of a measurement control unit of the detection device according to the second embodiment of the present invention.

FIG. 13 is a block diagram showing a configuration of a signal generator according to Embodiment 3 of the present invention.

FIG. 14 is a block diagram showing a configuration of a detection device according to Embodiment 3 of the present invention.

FIG. 15 is a flowchart showing a timer operation of the signal generator according to the third embodiment of the present invention.

FIG. 16 is a flowchart showing a timer operation of a measurement control unit according to Embodiment 3 of the present invention.

FIG. 17 is a configuration diagram when an indoor wiring survey is performed using a power line surveying device according to another embodiment of the present invention.

FIG. 18 is a configuration diagram of a conventional control device using power line carrier.

[Explanation of symbols]

1 signal generator, 1a signal generation switch, 1b timer operation start switch, 1c test signal generation display LE
D, 3 power line, 4 detector, 5 monitored equipment, 6
Coupler, 11a signal selecting means, 14 timing means,
13 switching signal generation means, 40 measurement control means, 4
2 Switching signal detecting means, 43 Time measuring means, 48 Storage means 1, 46 Timer measurement start switch, 47 Timer measurement data clear switch, 49, 50 Transmission judgment display LED.

Continuation of the front page (72) Ryoichi Ito 2-6-1, Otemachi, Chiyoda-ku, Tokyo Mitsui Electric Building Techno Service Co., Ltd. (72) Masaaki Kotake 2-6-1, Otemachi, Chiyoda-ku, Tokyo No. Mitsubishi Electric Building Techno Service Co., Ltd.

Claims (9)

[Claims] 1. A signal generator for generating a test signal of a predetermined format and injecting it into a power line, and non-contact coupling means for non-contact coupling with the power line. A power line exploration device, comprising: a detection device for detecting a signal, and displaying that the signal can be transmitted if the detected detection signal is equal to or higher than a predetermined signal strength. 2. A signal generator for intermittently generating a test signal of a predetermined format according to a predetermined time and injecting the test signal into a power line; non-contact coupling means for non-contact coupling with the power line; When the predetermined time is reached, the non-contact coupling means detects the test signal, stores the detected time and the strength of the detected detection signal, and the strength of the detection signal is predetermined. A power line exploration device, comprising: a display device that indicates that signal transmission is possible if the signal strength is equal to or higher than the detected signal intensity, and that displays the intensity of the detection signal corresponding to the time. 3. A test signal of a predetermined format is intermittently generated according to a predetermined time, and is injected into a power line and a predetermined switching signal is output when the test signal is intermittent. And a signal generator for injecting into the power line, non-contact coupling means for non-contact coupling with the power line, and detecting the test signal when detecting the switching signal from the non-contact coupling means, The detected time and the strength of the detected detection signal are stored, and if the strength of the detection signal is equal to or higher than a predetermined signal strength, it is displayed that the signal can be transmitted, and the detection signal is displayed corresponding to the time. A power line exploration apparatus, comprising: 4. The test signal generated by the signal generator is:
The power line search device according to any one of claims 1 to 3, wherein the power line search device can be selected according to a signal system used for power line carrier. 5. The signal generating device according to claim 1, further comprising: a non-contact coupling unit that couples with the power line in a non-contact manner and injects a signal into the power line. Power line exploration equipment. 6. A transmission control means for controlling transmission of a signal, a signal generation means for generating a test signal of a format predetermined by a signal selection means in accordance with a command from the transmission control means, and a signal for injecting the test signal into a power line. A signal generator having an injection means, a non-contact coupling means for non-contact coupling with the power line, and converting the test signal detected by the non-contact coupling means into a signal strength, wherein the signal strength is predetermined. A measurement control unit that outputs a signal indicating whether signal transmission is possible in comparison with the signal intensity, a transmission determination display unit that displays whether signal transmission is possible by the signal indicating whether signal transmission is possible, and a detection device that includes a level meter that indicates the signal intensity. A power line exploration device comprising: 7. A transmission control means for controlling transmission of a signal based on an output signal of a timer operation switch and a clock means, and a test signal of a format predetermined by the signal selection means is determined in advance by a command of the transmission control means. A signal generating device having a signal generating means intermittently generated according to a set time and a signal injecting means for injecting the test signal into a power line, a non-contact coupling means for non-contact coupling with the power line, and a timer measurement switch. After turning on, when the time by the signal generation clock means reaches the predetermined time, a test signal is detected by the non-contact coupling means, and the detected test signal is signaled. While converting into signal strength, the signal strength is compared with a predetermined signal strength and outputs a signal indicating whether or not signal transmission is possible. After performing the measurement for the set time, measurement control means for stopping the measurement operation, storage means for storing the signal strength and the detected time, a display for displaying the signal strength corresponding to the detected time, A power line exploration apparatus comprising: transmission determination display means for displaying whether or not signal transmission is possible by a signal indicating whether or not signal transmission is possible; and a detection device having a level meter for displaying the signal strength. 8. Transmission control means for controlling signal transmission based on an output signal of a timer operation switch and a clock means, and a test signal of a format predetermined by a signal selection means is determined in advance by a command of the transmission control means. Signal generating means for generating a switching signal indicating test start or stop, and signal injecting means for injecting the test signal and the switching signal into a power line. Non-contact coupling means for non-contact coupling with the power line, a timer measurement switch for turning on / off timer measurement, a detection clock means for outputting time information, and a switching signal for detecting the switching signal Detecting means, when a switching signal indicating the start of the test is detected by the switching signal detecting means, Setting, detecting the test signal by the non-contact coupling means, converting the detected test signal into signal strength, and comparing the signal strength with a predetermined signal strength to determine whether signal transmission is possible. After measuring the signal for the predetermined time, measurement control means for stopping the measurement operation, storage means for storing the signal intensity and the detected time, the signal corresponding to the detected time A power line exploration apparatus comprising: a display for displaying the intensity; a transmission determination display unit for displaying whether or not the signal can be transmitted based on the signal indicating whether or not the signal can be transmitted; and a detection device having a level meter for displaying the signal strength. . 9. The signal injection means according to claim 6, further comprising a non-contact coupling means for coupling to the power line in a non-contact manner and for injecting a signal into the power line. Power line exploration equipment.