JP2014209058A - Laying inspection device using dc pulse - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a laying inspection device using a DC pulse capable of reliably and simply performing a laying inspection at a low cost without letting a protection device such as an ELCB and a GFCI execute a shut-down operation for an incorrect wiring and the like accompanied with a new laying construction and an extension construction.SOLUTION: A wiring tester 1 inspects whether or not active rays L of a power line, a neutral line N, and a ground line E are correctly connected to a voltage pole 102, a neutral pole 103, and a ground pole 101 of a plug socket 100. The wiring tester applies a DC pulse to the voltage pole 102 of the plug socket 100 at predetermined timing by a DC pulse discharge circuit 17, and at this time, detects a voltage between the neutral pole 103 and a ground pole E by a DC pulse detection circuit 18, and determines by a micro computer 10 whether or not a wiring for the plug socket 100 is a correct laying or an incorrect laying on the basis of the detection result.

Description

  The present invention relates to a laying wiring inspection device using a direct current pulse, and more specifically, to correctly distinguish between a neutral (N) pole and a ground (E) pole of a single-phase AC line with a grounding terminal and a wrong laying. The present invention also relates to a laying tester using DC pulses that can be easily performed.

  In AC100V commercial wiring, if leakage occurs between wiring or grounding, or if leakage occurs in electrical equipment connected to the distribution line, it is difficult not only to ensure safety for human bodies, but also to fire, etc. It also leads to the cause of the occurrence. Therefore, a protection device (Earth Leakage Circuit Breaker: ELCB) is provided on the switchboard to detect leakage and cut off the supplied power. In addition, a ground fault circuit interrupter (GFCI) is actively installed to cut off power supply in conjunction with a circuit breaker.

  A construction contractor or the like usually carries out a completion inspection in order to ascertain the quality of the result of the construction after the construction or laying or expansion in the building from the cubicle as the commercial power supply wiring or after the construction is completed. For example, commercial AC100V "voltage (L) pole", "grounding (E) pole" and "neutral (N) pole" three types of wiring to the distribution board, distribution board and power outlet Is the target. In such construction, there may be a mistake in laying the power supply wiring, such as misplacement between the N pole line and the E pole, or connecting the N pole line and the E pole line together. If such a connection mistake is overlooked and the product is put into use, the circuit board is blocked by ELCB or GFCI provided in the distribution board or distribution board. This interruption immediately eliminates the supply of power to the distribution wiring, and a power outage caused by this will have a great impact on the consumer (for example, stoppage of operation). For this reason, it is an extremely important factor not to block ELCB or GFCI when laying confirmation or completion inspection is performed on commercial power supply wiring.

  As an apparatus used for the above inspection, for example, there is a wiring connection determination apparatus disclosed in Patent Document 1. This device injects a single positive / negative pulse voltage signal from a transmitter into a neutral wire short-circuited to the ground wire G on the base end side of the power supply wiring through a transformer connection, When the signal between the neutral terminal n and the ground terminal g is detected by the determination device and the polarity of the detected signal is the same as the injected signal, the wirings N and G are correctly connected to the terminals n and g, and vice versa. Identifies each connection as reversed.

  Further, the wiring checker disclosed in Patent Document 2 should be connected to the voltage side plug blade to be connected to the live wire electrode L, the neutral electrode plug blade to be connected to the neutral electrode N, and the grounding wire electrode E. A grounding plug blade is provided with three plug blades, and a resistance circuit including a high resistance element RH and a low resistance element RL connected in series is connected between the voltage side plug blade and the neutral electrode plug blade. The voltmeter is connected between both ends of the RL, the ground wire plug blade is connected to the low potential side of the low resistance element RL via the switch SW1, and the measured voltage Von of the voltmeter when the switch SW1 is turned on The presence or absence of miswiring is determined based on the measured voltage Voff of the voltmeter when turned off (that is, depending on whether or not a difference voltage of the ground resistance is generated).

  Further, the wiring checker disclosed in Patent Document 3 includes three plug blades as in the wiring checker of Patent Document 2, and includes a voltmeter, a voltage-side plug blade between the neutral electrode plug blade and the ground wire plug blade. When a resistance circuit composed of a variable resistance element is connected between the ground wire plug blade and the resistance value of the variable resistance element is changed, if the voltmeter value changes, it is determined that the wiring is normal and the voltmeter If the value does not change, it is determined that the wiring is incorrect.

JP-A-6-6916 JP 2012-173023 A JP 2012-173024 A

  However, the above-described wiring connection determination device disclosed in Patent Document 1 needs to find a system wiring and interpose a transformer connection part in the N pole line when applying a pulsed voltage signal to the N pole line. Before and after starting the transformer, it is necessary to attach and detach the transformer connecting portion, which is inconvenient. In addition, it is complicated and expensive in terms of circuit to accurately send and detect a single positive / negative pulsed voltage signal via a CT to a power supply that has a lot of noise.

  Furthermore, since the wiring checker disclosed in Patent Document 2 has a resistance between the voltage side and the ground line, the leakage current is generated through the resistance even when the leakage current is reduced, and the measurement circuit is switched on. There is a possibility that the earth leakage breaker operates.

  In addition, the wiring checker disclosed in Patent Document 3 is a display method in which an operator must determine one from seven types of determination results based on combinations of lighting of three LEDs in the case of normal wiring. There is a disadvantage that it is necessary to refer to the correspondence table, and it takes time to obtain the determination result and the operation is troublesome.

  Accordingly, the present invention has been made in view of such problems, and is reliable, simple, and inexpensive that can perform a laying inspection without interrupting ELCB or GFCI for erroneous wiring associated with new laying work, expansion work, or the like. The object is to provide a laying tester using DC pulses.

  In order to solve the above problem, the invention according to claim 1 inspects whether the active line, neutral line and ground line of the power line are correctly connected to the voltage pole, neutral pole and ground pole of the outlet. In the installed inspection device, the wiring to the outlet is correct based on the DC pulse generating means for applying a DC pulse to the voltage electrode and whether or not a voltage corresponding to the DC pulse is output between the neutral electrode and the ground electrode. And determining means for determining whether it is laying or wrong laying, and applying a DC pulse to the voltage electrode.

  In order to solve the above-mentioned problem, the present invention as claimed in claim 2 is the laying tester using the direct-current pulse according to claim 1, wherein the direct-current pulse generating means is based on a capacitor and a supply voltage to the voltage electrode. A charging circuit for charging the capacitor, and a DC pulse discharging circuit for applying the charging charge of the capacitor as a DC pulse to the voltage electrode, and the judging means detects the DC pulse by taking in the voltage corresponding to the DC pulse through the neutral electrode. Depending on the state of occurrence, when the circuit, the alarm means for displaying and / or sounding warnings of correct laying and / or incorrect laying, and the DC pulse discharge circuit are controlled and the DC pulse detection circuit detects a voltage corresponding to the DC pulse And a determination circuit for driving the notification means.

  In order to solve the above-mentioned problem, the present invention described in claim 3 is the laying inspector using the DC pulse according to claim 1 or 2, wherein the DC pulse discharge circuit has a pulse width of 50 to 200 μS. Is generated on the negative cycle side of the commercial power supply at intervals at which no demagnetization phenomenon occurs.

In order to solve the above-mentioned problem, the present invention described in claim 4 provides a laying tester using the DC pulse according to claim 3, wherein the DC pulse discharge circuit includes two DC pulses applied to the voltage electrodes. When the width of the _first DC pulse is T ₁ , the pause time width of the two DC pulses is T ₂ , and the width of the _second DC pulse is T ₃ , T ₁ , T ₂ , T ₃ are It is characterized in that it is set so as to satisfy the condition of the formula shown below.

  In order to solve the above-mentioned problem, the present invention described in claim 5 is directed to a laying tester using a DC pulse according to any one of claims 1 to 4, wherein the DC pulse detection circuit includes a voltage electrode and a ground. A switching circuit for switching and outputting the polarity is provided on the input side, and the determination means determines whether the laying is correct or incorrect based on the switching operation of the switching circuit.

  In order to solve the above-mentioned problem, the present invention described in claim 6 is the laying tester using the DC pulse according to claim 2, wherein the notification means includes a liquid crystal display that digitally displays the voltage value of the active line; And an LED for displaying correct laying and erroneous laying.

  According to the laying inspector using the DC pulse according to the present invention, the protection device such as ELCB, GFCI, etc. can be reliably and easily operated against an erroneous wiring accompanying a new laying work, an extension work, etc. There is an effect that laying inspection can be performed at low cost.

It is a block diagram which shows one preferable embodiment of the installation tester using the DC pulse which concerns on this invention. It is a circuit diagram which shows the detail of the charging circuit shown in FIG. The external appearance of the installation tester using the direct current | flow pulse which concerns on this invention is shown, (a) is a front view, (b) is a right view. The connection of a power supply wiring and an outlet is shown, (a) is a wiring diagram at the time of normal connection, and (b) is a wiring diagram at the time of incorrect connection. It is a flowchart which shows operation | movement of the installation tester using the direct current | flow pulse which concerns on this invention. As an embodiment according to the present invention, (a) shows a waveform diagram of two DC pulses, (b) is an enlarged waveform diagram showing details of the pulse width of the DC pulse Pd.

[Configuration of laying inspection equipment using DC pulses]
Hereinafter, a laying tester (hereinafter referred to as “laying tester”) using a DC pulse according to the present invention will be described in detail based on a preferred embodiment. FIG. 1 is a block diagram showing an embodiment of a laying tester according to the present invention, and FIG. 2 is a circuit diagram showing details of a charging circuit and a DC pulse detection circuit shown in FIG. The illustrated laying inspector 1 schematically shows a system voltage applied to a microcomputer (hereinafter referred to as “microcomputer”) 10 as a determination circuit for executing various controls and processes, and a liquid crystal display (see FIG. 3). A liquid crystal display circuit 11 for displaying, an LED display circuit 12 for driving three LEDs that light up each color of operation / normal / abnormal, and a plug (plug) connected to an outlet 100 attached to a wall or the like ( A connection terminal 13 to which a power cord 30 (not shown) is connected, a switching circuit 14 connected to the connection terminal 13 and controlled by the microcomputer 10 during a test, and a DC pulse applied to the L pole 102 of the outlet 100 A capacitor 15 serving as a power source, a charging circuit 16 for charging the capacitor 15, and charging energy of the capacitor 15 at a predetermined timing and A DC pulse discharge circuit 17 that discharges with a pulse width, a DC pulse detection circuit 18 that detects a DC pulse Pd applied to the L pole 102 by the DC pulse discharge circuit 17 via the switching circuit 14, a battery, and a predetermined DC voltage And a push button switch 20 that is connected to the microcomputer 10 and starts a laid wiring inspection by an ON operation. The circuit shown in FIG. 1 is mounted on, for example, one printed board.

  Here, the capacitor 15, the charging circuit 16 and the DC pulse discharging circuit 17 form a pulse discharging means, and the liquid crystal display circuit 11, the LED display circuit 12, and the liquid crystal display 22, LED 23, 24, shown in FIG. 25 is a notification means. Further, the DC pulse detection circuit 18 and the microcomputer 10 form a determination means.

  As shown in FIG. 1, the outlet 100 has three poles including a ground (E) pole 101, a voltage (L) pole 102, and a neutral (N) pole 103, and the outlet 100 has a ground pole 101 and a ground N of the system. Between them, there is usually a grounding resistance R of about 10 to 100Ω. Further, as shown in FIG. 2, an impedance Z is interposed between the L pole 102 and the E pole 101 and between the N pole 103 and the E pole 101.

  The microcomputer 10 is a one-chip microcomputer, and for example, a one-chip microcomputer commercially available from each company can be used. Specifically, the H8 series manufactured by Renesas Technology, the PIC series manufactured by Microchip Technology, and the AVR series manufactured by ATMEL are known.

  If the switching circuit 14 is compared with a mechanical switch, it is comprised by the electronic switch which has a function of 2 circuits 2 contacts (= 2 pole double throw type), and if it shows a circuit diagram, it will become like FIG. The a contacts of the SWs (switches) 1 and 2 are connected to the input part of the DC pulse detection circuit 18, and the c contacts of the SWs 1 and 2 are connected to the N pole 103 and the E pole 103. The a contact of SW1 and the b contact of SW2 are connected, and the a contact of SW2 and the b contact of SW1 are connected. The charging circuit 16 rectifies the voltage AC100V of the L pole 102 of the outlet 100 with a diode 161, and charges the capacitor 15 via the preliminary charging resistor 162. The charging voltage Vc of the capacitor 15 is applied to the microcomputer 10 and the emitter of the transistor 171 functioning as a switch, and the charging voltage Vc of the capacitor 15 is applied to the L pole 102 as a pulse waveform as the transistor 171 is turned on for a short time. Note that another semiconductor element or switching element having a similar function can be used instead of the transistor 171, for example, an IC, a semiconductor switching element, a relay, or the like.

  The DC pulse detection circuit 18 is electrically insulated from the connector 100 side by being connected to the microcomputer 100 via an optical device. As shown in FIG. 2, the comparator 180 is provided, the output voltage Vo of the contact a of SW1 of the switching circuit 14 is applied to the (+) input terminal, and the reference voltage Vref for comparison is applied to the (−) input terminal. If the output voltage Vo is larger than the reference voltage Vref, the output voltage Vd is output from the comparator 180.

  3A and 3B show the appearance of the laying inspection apparatus according to the present invention, wherein FIG. 3A is a front view and FIG. 3B is a side view. In addition, illustration of the power cord 30 is omitted in FIG. The laying inspector 1 has a size and a shape that the casing 21 can be held by hand as shown in FIG. 3A, and is driven by the liquid crystal display circuit 11 at the center of the upper surface, so that the line voltage, the battery mark, etc. A liquid crystal display 22 for displaying is provided. Further, a push button switch 20 is disposed on the upper surface, and LEDs 23, 24 and 25 driven by the LED display circuit 12 are disposed on the upper surface of the liquid crystal display 22. In the present embodiment, the LED 23 is lit in green when the power is turned on, the LED 24 is lit in blue when a normal connection is detected, and the LED 25 is lit in red when erroneous laying is detected. Instead of providing the LEDs 23, 24, 25, the liquid crystal display 22 may be displayed with characters or illustrations instead.

  As shown in FIG. 3B, a rocker type power switch 26 and a push button type illumination switch 27 are provided on the right side surface. The LED 23 is turned on by pressing the ON side of the power switch 26, and the LED light 28 provided on the upper side surface of the housing 21 is turned on by pressing the illumination switch 27. This LED light 28 is for illuminating the connector 100 to facilitate the inspection work even when the installation location of the outlet 100 is dark. Furthermore, it is possible to generate a warning sound together with (or without) the light emission of the LED 25 in the event of an abnormality. For this purpose, a dial tone or a melody sound is generated based on a speaker, an amplifier circuit that drives the speaker, and a different determination signal. A circuit for generating an alarm signal such as the above may be provided. With a similar configuration, a warning sound can be emitted even during normal operation.

[How to use the laying tester 1]
Next, a method of using the laying inspection device 1 will be described. 4A and 4B show the connection between the power supply wiring and the outlet, where FIG. 4A is a wiring diagram for normal connection, and FIG. 4B is a wiring diagram for incorrect connection. FIG. 5 is a flowchart showing the operation of the laying tester 1, and the program is written in a ROM (not shown) of the microcomputer 10. First, when the power supply wiring and the outlet are normally connected (normally laid), as shown in FIG. The L pole 102 of the outlet 100 is connected to one of the secondary feeders u and v (active wires) of the transformer), the secondary feeder o of the transformer T is grounded to the basement near the transformer T, and the secondary feeder The N pole 103 is connected to the o line, and the E pole 101 is grounded near the outlet 100. On the other hand, when the connection between the N pole 103 and the E pole 101 is incorrect, the connection of the L pole 102 is the same as that of FIG. 4A as shown in FIG. The pole 101 is connected to the secondary winding o (neutral line) of the transformer T, and the N pole 103 is grounded.

  In the above state, the operator first inserts the plug of the power cord 30 of the laying tester 1 into the outlet 100. Next, the power switch 26 shown in FIG. 3B is turned on (step S201: Yes). When the power switch 26 is turned on, charging of the capacitor 15 is started by the charging circuit 16 of the laying tester 1, and the charging state is monitored by the microcomputer 10 (step S202). When it is necessary to select the number of poles, the operator selects 2P (2 poles) or 3P (3 poles) by briefly pressing the button switch 20 with a finger while watching the liquid crystal display 22 (for example, 2 seconds or less). (Step S203). Next, the operator presses the button switch 20 with a finger for a long time (for example, 2 seconds or more) (step S204: Yes). In response to this operation, when the microcomputer 10 confirms that the capacitor 15 is charged to a desired voltage value or more (step S202), the microcomputer 10 activates the DC pulse discharge circuit 17 and the transistor of the DC pulse discharge circuit 17 shown in FIG. 171 is made conductive, and the charge of the capacitor 15 is sent to the L pole 102 of the outlet 100 as a DC pulse Pd through the DC pulse discharge limiting resistor 172 connected to the collector at the timing t1 shown in FIG. (Step S205). As a result, current flows in the direction indicated by arrow A.

FIG. 6A is a waveform diagram showing the transmission timing of the DC pulse Pd by the DC pulse discharge circuit 17, and FIG. 6B is an enlarged waveform diagram showing details of the pulse width of the DC pulse Pd. Although FIG. 6 shows the case of 50 Hz, the same applies to 60 Hz. However, in the case of 60 Hz, the half cycle time becomes 8.3 mS with respect to 10 mS of 50 Hz. As shown in FIG. 6A, the DC pulse transmission timing is in the middle of the negative potential section of AC 100V. Then, in order to ensure the detection operation, DC pulse Pd to be sent is, FIG. 6 (a), the provided downtime T ₂ two in the forward direction in the same cycle as shown in (b) (2 shots) The DC pulse Pd is transmitted on the negative cycle side of the commercial power source of the active line. The reason is that the direct current pulse Pd is added to the active line, so that the voltage peak value becomes excessive when it is transmitted on the positive cycle side. However, as shown in FIGS. 6 (a) and 6 (b), if it is sent on the negative cycle side of the commercial power supply, problems such as the occurrence of overvoltage do not occur to the extent that the voltage peak value decreases.

On the other hand, a wider DC pulse Pd is easier to detect, but there is a possibility that a demagnetization phenomenon or the like may occur as an influence on the commercial power supply. Therefore, the width of the DC pulse Pd is set to about 50 to 200 μS. For example, when the width of the direct current pulse Pd is reduced to 1 μS or less, although there is a merit that the part shape can be reduced, detection is difficult due to the response speed and the like, which is not practical. For this reason, the width of the DC pulse Pd is set to a value that does not adversely affect the commercial power supply. Specifically, as shown in FIG. 6B, the width of the _first DC pulse Pd is T ₁ , the pause time width of the two DC pulses is T ₂ , and the width of the _second DC pulse Pd is When T ₃ is set, T ₁ , T ₂ , and T ₃ are set so as to satisfy the expression shown in Equation 1.

  The circuit configuration employs a capacitor input configuration in order to reduce the cost, and the voltage of the DC pulse Pd is limited to about 120V. The delivery current is determined by the DC pulse discharge limiting resistor 172. In the case of D-type grounding (equipment grounding), the grounding resistance is determined to be 100Ω or less by the standard, so that it is preferable to set the pulse voltage to about 50 V and the pulse width to 50 to 200 μS. The voltage of the direct current pulse Pd is preferably less than or equal to the peak value of the supplied voltage, and the current of the direct current pulse Pd also preferably does not exceed the peak value of the received voltage by the voltage multiplied by the power supply impedance. If the voltage exceeds the peak value, there is a possibility that the device, components, circuits, etc. connected to the power supply will have an effect on the withstand voltage.

  It is determined that the DC pulse Pd is normally laid while one of the conditions is a case where both of the DC pulses Pd can be detected. That is, when neither of the two direct-current pulses Pd transmitted is detected, this is notified as “NE reverse”, for example. However, if only one pulse is detected even if two direct current pulses Pd are sent out, the liquid crystal display 22 can notify the operator of a display prompting re-examination. Furthermore, when three or more DC pulses Pd are sent, the result of the pulse is determined by the majority circuit. As the number of DC pulses Pd generated increases, the accuracy of determination improves. However, since the circuit configuration becomes complicated and the cost increases, a pulse number of 2 to 3 is preferable.

  When two DC pulses Pd are sent in step S205, SW1 and SW2 of the switching circuit 14 are in a state where the c contact and the a contact are connected as shown in FIG. 2, which is the initial state. At this time, the voltage Vo1 (voltage between the N pole 103 and the E pole 101) output from the contact a of SW1 is taken into the DC pulse detection circuit 18, and the output signal Vd is generated from the comparator 180 shown in FIG. (Step S206).

  Next, the microcomputer 10 controls the switching circuit 14 when a predetermined time has elapsed from the generation of the DC pulse Pd, and switches the SW1 and SW2 in the initial state so that the c contact and the b contact are connected. Then, similarly to the connection of the c-a contacts, the microcomputer 10 sends out two DC pulses Pd at the timing t2 as shown in FIG. At this time, the voltage Vo2 output from the b-contact is taken into the DC pulse detection circuit 18 (step S206). However, no voltage is detected from the b-contact during normal connection. As a result, the microcomputer 10 determines normal connection (= normal laying) (step S207: normal laying), and controls the LED display circuit 12 to turn on (normal) the LED 24 (step S208).

  Next, the case of incorrect connection in which the connection between the N pole 103 and the E pole 101 is replaced as shown in FIG. 4B will be described. In addition, since the process of step S201-S206 is the same as the case of normal laying, description is abbreviate | omitted. In step S205, when the DC pulse Pd is sent to the outlet 100 at the timing T1 as shown in FIG. 6, current flows from the L pole 102 to the N pole 103 as shown by the arrow B in FIG. In addition, the SW contact 1 and SW 2 of the switching circuit 14 are both selected as the initial state, and no current flows through the E pole 101. As a result, no voltage is generated between the N pole 103 and the E pole 101, and no detection signal is applied to the DC pulse detection circuit 18. Next, when a predetermined time elapses from the generation of the direct current pulse Pd, the microcomputer 10 automatically switches the contacts of SW1 and SW2 from the contact a to the contact b, and then sends the direct current pulse Pd at the timing t2. Generates a voltage. Therefore, the microcomputer 10 determines incorrect installation (= incorrect connection) (step S207: incorrect installation), and controls the LED display circuit 12 to turn on (abnormal) the LED 25 (step S209).

  The above results are summarized in Table 1. As is clear from Table 1, the microcomputer 10 determines whether it is correctly installed or incorrectly installed according to the operation order of SW1 and SW2 and the order of generation of H and L of the output voltage of the comparator 180. In addition, the microcomputer 10 also determines that two Pd detections can be detected. Then, the worker who sees the "abnormal" lighting by the LED 25 recognizes the erroneous connection (= erroneous laying), and implements the construction for changing to the wiring of FIG.

[Effect of the embodiment]
According to the installation inspection device using the DC pulse according to the present embodiment, the DC pulse Pd is sent between the L pole 102 and the E pole 101 of the outlet 100 at a predetermined timing, and the voltage associated therewith is N pole 103. Whether it is generated between the E pole 101 and the E pole 101, whether it is immediately laid (= normal connection) or incorrect (= misconnection) with a simple configuration, without being blocked by a protective device such as ELCB or GFCI. There is an effect that it can be determined.

  In addition, the generation of the DC pulse Pd has an effect that the circuit configuration is simplified because the DC power source for the DC pulse Pd can be easily secured by using the charge of the capacitor as a power source.

  Further, by setting the width of the direct current pulse Pd to 50 to 200 μS, there is an effect that it is possible to avoid the phenomenon of magnetic bias on the commercial power source. Further, by making the DC pulse Pd two or more times, there is an effect that the inspection can be surely performed without being affected by noise or the like.

Further, the DC pulse discharge circuit 17 sends two DC pulses, the width of the _first DC pulse is T ₁ , the pause time width of the two DC pulses is T ₂ , and the width of the second DC pulse. When T ₃ is set to T ₃ , setting T ₁ , T ₂ , and T ₃ so as to satisfy the expression shown in Equation 1 has an effect of not affecting the commercial power supply.

  In addition, by providing the switching circuit 14, there is a normal connection (normal laying) or an incorrect laying (= erroneous connection) depending on whether or not a voltage corresponding to the DC pulse Pd is generated when switching from the a contact to the b contact. There is an effect that can be easily and reliably identified.

  Further, since the liquid crystal display 22 is provided, the system voltage can be measured without preparing a circuit tester (also referred to as a tester) or the like, so that it is known whether or not the system power is supplied to the connector 100. It is possible to reduce the number of measuring instruments brought into the field. Furthermore, normality and abnormality can be immediately grasped by the LED.

  As described above, the preferred embodiment of the present invention has been described in detail. However, the present invention is not limited to the specific embodiment, and within the scope of the gist of the present invention described in the claims, Needless to say, various modifications and changes are possible.

1 Laying tester using DC pulse (laying tester)
10 Microcomputer (judgment circuit)
DESCRIPTION OF SYMBOLS 11 Liquid crystal display circuit 12 LED display circuit 13 Connection terminal 14 Switching circuit 15 Capacitor 16 Charging circuit 17 DC pulse discharge circuit 18 DC pulse detection circuit 19 Power supply part 20 Pushbutton switch 21 Case 22 Liquid crystal display 23, 24, 25 LED
26 Power Switch 27 Lighting Switch 28 LED Light 30 Power Cord 100 Outlet 101 Ground (E) Electrode 102 Voltage (L) Electrode 103 Neutral (N) Electrode 161 Diode 162 Precharge Resistor 171 Transistor 172 DC Pulse Discharge Limiting Resistor 180 Comparator

In order to solve the above-mentioned problem, the present invention described in claim 3 is the laying tester using the DC pulse according to claim 2 , wherein the DC pulse discharge circuit includes a plurality of DC pulses with a pulse width of 50 to 200 μS. The unit is generated on the negative cycle side of the commercial power supply by an interval at which no demagnetization phenomenon occurs.

In order to solve the above-mentioned problem, the present invention described in claim 5 is directed to a laying tester using a DC pulse according to any one of claims 2 to 4, wherein the DC pulse detection circuit includes a voltage electrode and a ground. A switching circuit for switching and outputting the polarity is provided on the input side, and the determination means determines whether the laying is correct or incorrect based on the switching operation of the switching circuit.

Claims (6)

In the laying tester that checks whether the active line, neutral line and ground line of the power line are correctly connected to the voltage pole, neutral pole and ground pole of the outlet,
DC pulse generating means for applying a DC pulse to the voltage electrode;
Determination means for determining whether the wiring to the outlet is a correct laying or a false laying based on whether or not a voltage corresponding to the DC pulse is output between the neutral electrode and the ground electrode;
A laying inspection device using a direct current pulse characterized by comprising: In the installation inspection device using the DC pulse according to claim 1,
The DC pulse generating means includes a capacitor, a charging circuit for charging the capacitor based on a supply voltage to the voltage electrode, and a DC pulse discharging circuit for applying a charging charge of the capacitor to the voltage electrode as a DC pulse. With
The determination means controls a direct current pulse detection circuit that takes in a voltage corresponding to the direct current pulse through the neutral pole, an informing means that displays a correct laying and / or an incorrect laying and warns by sound, and the direct current pulse discharge circuit In addition, when the DC pulse detection circuit detects a voltage corresponding to the DC pulse, the laying inspection using the DC pulse is provided with a determination circuit that drives the notification means according to the occurrence state of the voltage vessel. In the installation inspection device using the direct current pulse according to claim 1 or 2,
The DC pulse discharge circuit generates a plurality of DC pulses with a pulse width of 50 to 200 μS on the negative cycle side of a commercial power supply at intervals that do not cause a demagnetization phenomenon. vessel. In the installation inspection device using the DC pulse according to claim 3,
The DC pulse discharge circuit has two DC pulses applied to the voltage electrode, the first DC pulse width is T ₁ , the pause time width of the two DC pulses is T ₂ , and the _second DC pulse is A laying tester using a DC pulse, wherein T ₁ , T ₂ , T ₃ are set so as to satisfy the condition of the following expression ₁ when the pulse width is T ₃ .

In the installation tester using the DC pulse according to any one of claims 1 to 4,
The DC pulse detection circuit includes a switching circuit for switching and outputting the voltage electrode and the ground electrode on the input side, and the determination unit determines whether the laying is correct or incorrect based on the switching operation of the switching circuit. A laying inspector using DC pulses characterized by this. In the installation inspection device using the DC pulse according to claim 2,
The laying inspector using DC pulses, wherein the notification means includes a liquid crystal display that digitally displays the voltage value of the active line, and an LED that displays the normal laying and incorrect laying.

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