JP3128286U - Wiring tester - Google Patents

Abstract

A wiring tester having a simple structure for testing a wiring circuit to an outlet is provided.
A wiring tester includes a power supply voltage insertion blade Lt that can be connected to a power supply voltage electrode of an outlet, a grounding insertion blade Et that can be connected to a grounding electrode, and a power supply ground that can be connected to a power supply grounding electrode. Including the insertion blade Nt. Furthermore, a first rectifying element R1 connected to the power supply voltage inserting blade, a second rectifying element R2 connected to the grounding inserting blade, the first rectifying element, and the second rectifying element, A first display circuit L1 connected to the power supply ground, a second display circuit L2 connected to the power grounding plug and the second rectifier, a power ground plug and the first rectifier. And a third display circuit L3 connected to the.
[Selection] Figure 3

Description

  The present invention relates to a wiring tester for inspecting a wiring system that supplies power to an outlet.

  In factories, offices, and the like, a large number of outlets for connecting power supply plugs of electrical devices are provided. Some single-phase power outlets have three plug outlets including a ground circuit, and each outlet is configured in various shapes and arrangements depending on the voltage and capacity used. . In the present specification, the electrodes of the three outlets of the outlet are referred to as a power supply voltage electrode, a power supply ground electrode, and a ground electrode, respectively. The power supply voltage electrode is connected to a power supply voltage terminal of a transformer provided in the substation, and the power supply ground electrode is connected to a power supply ground terminal of the transformer. The ground electrode is connected to a ground plate or the like embedded in the ground through another wiring independent of the power supply voltage terminal and the wiring connected to the power ground terminal.

  The electrical equipment cannot be used safely unless the electrodes provided at the three outlets of the outlet are properly connected to the power supply voltage terminal, power supply ground terminal, and ground plate of the transformer. After the construction is completed, various wiring confirmation inspections are performed. The wiring confirmation inspection includes inspection of the circuit system to confirm that the outlet is correctly connected to each circuit breaker of the distribution board, wiring connection inspection to confirm the connection state of the wiring to each electrode of the outlet, Includes measurement of insulation resistance for circuits with batched outlets. Conventionally, the inspection of the circuit system and the wiring connection inspection are performed by inserting the circuit breaker of the distribution board after the wiring work is completed, energizing each outlet, and inserting the tester probe into the outlet and checking the voltage. Was doing a lot of work.

  FIG. 1 of Patent Document 1 discloses a circuit diagram of an embodiment according to a wiring tester for a single-phase power outlet. The tester 1 is provided with three lamps L1, L2, and L3 and a voltmeter 5. When the wiring to the outlet is normal, only L1 and L2 are lit. If the voltage terminal connections are reversed, only L2 and L3 are lit. When the ground terminal is not grounded, all the lamps are turned on, and when the voltage terminal is not connected, all the lamps are turned off. Thus, the wiring state can be checked by the lighting state of the lamp of the wiring tester.

Patent Document 2 discloses an outlet checker that can be connected to an outlet and perform an outlet polarity check and an earth leakage circuit breaker operation test at the same place using the same device. In FIG. 2 of the publication, it can be confirmed that the terminal L is connected to the power supply voltage electrode of the outlet 4 when the light emitting diode LED1 is lit, and the terminal E is grounded when the light emitting diode LED2 is lit. Can be confirmed.
Japanese Patent Application Laid-Open No. 6-213952 JP 2000-180496 A

  In the wiring confirmation inspection performed after installing many outlets, much labor has been expended and the appearance of a wiring tester that enhances work efficiency at the construction site has been desired. On the other hand, the wiring confirmation inspection is one of the important steps for safely using the electrical equipment, and must be performed reliably. Therefore, the wiring tester used for the wiring confirmation inspection needs to realize a safe, quick and reliable inspection in harmony with the inspection procedure at the construction site. Accordingly, an object of the present invention is to provide a wiring tester capable of quickly and surely performing a wiring confirmation inspection to an outlet of an AC power supply system. A further object of the present invention is to make such a wiring tester lightweight, compact and inexpensive.

  The present invention is a wiring tester including an insertion blade that can be inserted into an outlet provided with a power supply voltage electrode, a power supply grounding electrode, and a grounding electrode, the power supply voltage insertion blade being connectable to the power supply voltage electrode, A grounding insertion blade connectable to the grounding electrode, a power supply grounding insertion blade connectable to the power supply grounding electrode, and a first rectifier having one terminal connected to the power supply voltage insertion blade An element, one terminal connected to the grounding blade, the other terminal of the first rectifier element, and the other terminal of the second rectifier element. A first display circuit; a second display circuit connected to the power grounding plug and the other terminal of the second rectifying element; the power ground plug and the first rectification A wiring tester having a third display circuit connected to the other terminal of the element is provided.

  The wiring tester according to the present invention is provided with an insertion blade that can be inserted into an outlet and a display circuit. By inserting the insertion blade into the outlet of the outlet, the electrode of the outlet depends on the operating state of the display circuit. The wiring state can be easily confirmed through the voltage of. In addition, by providing a first rectifying element connected to the power supply voltage insertion blade and a second rectifying element connected to the grounding insertion blade, the power distribution can be performed while the wiring tester is coupled to the outlet. Even if the insulation resistance test is performed for the outlet and wiring from the panel side, the impedance inside the wiring tester is not affected. Therefore, the wiring confirmation inspection at the construction site can be carried out with good procedure. The rectifier element does not interfere with the display of the display circuit that is lit with an AC voltage, but exhibits a high resistance value for an insulation resistance test performed with a DC voltage, so the impedance of the display circuit is insulated from the insulation resistance test. Does not act to reduce resistance.

  According to the present invention, it has been possible to provide a wiring tester capable of quickly and surely performing a wiring confirmation inspection of an outlet connected to an AC power supply system. Furthermore, the present invention makes it possible to make such a wiring tester lightweight, small and inexpensive.

[Description of wiring to outlet]
FIG. 1 is a diagram illustrating an example of connection of a transformer that supplies power to an outlet. FIG. 1A shows two power supply voltage lines L connected to the power supply voltage terminal on the secondary side of the three-phase transformer connected in delta connection, a power supply ground line N connected to the power supply ground terminal, A ground line E connected to the ground plane is shown. A nominal AC voltage of 200 V is generated between the two power supply voltage lines L, and a nominal AC voltage of 100 V is generated between each power supply voltage line L and the power supply ground line N. The power supply ground line N and the ground line E are at the same potential if the voltage drop due to the current flowing through the ground resistor is ignored, and a nominal 100V AC voltage is also present between each power supply voltage line L and the ground line E. It has occurred.

  FIG. 1B shows three power supply voltage lines L connected to the power supply voltage terminal on the secondary side of the star-connected three-phase transformer, a power supply ground line N connected to the power supply ground terminal, A ground line E connected to the ground plane is shown. An AC voltage of nominal 100 V is generated between each power supply voltage line L and power supply ground line N. Between each power supply voltage line L, an AC voltage of nominally 173 V is generated. As in FIG. 1A, the power supply ground line N and the ground line E are at the same potential if the voltage drop due to the current flowing through the ground resistor is ignored, and between the power supply voltage line L and the ground line E. In addition, a nominal AC voltage of 100V is generated. In FIG. 1C, two power supply voltage lines L connected to the power supply voltage terminal on the secondary side of the single phase transformer, a power supply ground line N connected to the power supply ground terminal, and a ground plate are connected. A ground line E is shown. A nominal voltage of 200V is generated between the two power supply voltage lines, and an AC voltage of 100V is generated between each power supply voltage line L and the power supply ground line N. 1A and 1B, the power supply ground line N and the ground line E have the same potential if the voltage drop due to the current flowing through the ground resistance is ignored. An AC voltage having a nominal value of 100 V is also generated with E.

  In this way, multiple lines are wired from the substation to the distribution board, and the voltage between the lines is different, so if you do not check the wiring, dangerous voltage may be generated at the outlet due to incorrect wiring There is sex. Further, the same voltage as that between the power supply voltage line L and the power supply ground line N is generated between the power supply voltage line L and the ground line E, but between the power supply voltage line L and the ground line E. When a load is connected, a load current flows through the ground line E and the voltage rises through the ground resistance, which may be dangerous, so the power supply ground line N and the ground line E should be wired correctly so that they do not cross each other. It must be.

  FIG. 2 is a system diagram of a distribution board that supplies power to an outlet. The distribution board 10 is provided in the factory or office near the place where electricity is used. For example, the power distribution line 10 and the ground line E as the power voltage line L and the power ground line N from any of the transformers shown in FIG. The electric wire 33 is wired. The electric wire 31 is composed of 2 to 4 wires and is connected to the primary side of the main wiring breaker 11, and the secondary side of the main wiring breaker 11 has four branch wiring breakers 13, 15, 17, 19. Connected to the primary side. Electric wires 23, 25, 27, and 29 are wired to the outside from the secondary side of each branch wiring breaker. A plurality of single-phase outlets 33, 35, 37, and 39 are connected to the electric wires 23, 25, 27, and 29, and one circuit system is configured for each branch wiring breaker.

  In the present embodiment, the wirings 23, 25, 27, 29 constituting the circuit system are formed by two or three lines of one or two power supply voltage lines L and one power supply ground line N. Are connected to the power supply voltage electrode and the power supply ground electrode of each outlet by an electric wire branched from a connection box. The electric wires 33 are connected to the connection bar 21, branched from the connection bar 21 into four electric wires, and wired to an outlet of each circuit system. In this way, the three lines of the power supply voltage line L, the power supply ground line N, and the ground line E are connected to each outlet.

[Description of circuit of wiring tester]
FIG. 3 is a block diagram for explaining the function of the power supply tester 100 according to the present embodiment. The power supply voltage terminal Lt corresponds to a power supply voltage insertion blade that can be coupled to the power supply voltage electrode of the outlet. The power ground terminal Nt corresponds to a power grounding insertion blade that can be coupled to the power ground electrode of the outlet. The ground terminal Et corresponds to a grounding insertion blade that can be coupled to the grounding electrode of the outlet. One terminal of the rectifying element R1 is connected to the power supply voltage terminal Lt in an arrangement in which the direction of the power supply voltage terminal Lt is a forward direction. One terminal of the rectifier element R2 is connected to the ground terminal Et in an arrangement in which the direction opposite to the ground terminal Et is the forward direction. A display circuit L1 is connected to the other terminal of the rectifying element R1 and the other terminal of the rectifying element R2. A display circuit L2 is connected to the other terminal of the rectifying element R2 and the power supply ground terminal Nt. Display circuits L3 and L4 are connected to the other terminal of the rectifying element R1 and the power supply ground terminal Nt.

  The rectifying element R1 has a high resistance value with respect to direct current from the power supply voltage terminal Lt toward the internal circuit of the power supply tester 100, and the rectifying element R2 has a high resistance value from the internal circuit of the test apparatus 100 toward the ground terminal Et. Indicates. In the present embodiment, the display start and stop conditions of the display circuits L1, L2, L3, and L4 are governed only by the applied voltage values, and are displayed by certain voltage values V1, V2, V3, and V4, respectively. After the display is started, the display is stopped at the voltage values Vx1, Vx2, Vx3, and Vx4 that are equal to or lower than the voltage values V1, V2, V3, and V4. A display circuit having such display characteristics can be easily realized by using a neon lamp or a light emitting diode, which is convenient for manufacturing a simple wiring tester.

  The wiring tester 100 according to the present embodiment is created for the purpose of efficiently performing an actual wiring confirmation inspection in the field, and the display circuits L1, L2, L3, and L4. No high accuracy is required for the voltage at which the display starts or stops. As is clear from the description with reference to FIG. 1, even if the wiring system that supplies power to the outlet has an incorrect wiring and a voltage abnormality occurs, the abnormal voltage is sufficiently distinguished from the normal voltage. Because it is as big as possible. Moreover, the wiring confirmation inspection does not include inspection of voltage abnormality due to a transformer or other causes. On the other hand, the display circuits L1, L2, L3, and L4 may be configured by combining a light emitting element and an active semiconductor element such as a transistor that operates the light emitting element. On the other hand, the performance may be higher than necessary. However, since the accuracy of the voltage values for starting and stopping the display can be improved and controlled freely, they may be employed when performing a precise voltage inspection.

[Explanation of wiring tester operation]
FIG. 4 is a diagram illustrating the display start and stop characteristics of each display circuit constituting the wiring tester 100. The wiring tester 100 according to the present embodiment is configured for a nominal 100V AC circuit outlet, but the idea of the present invention is applied to a wiring tester for other AC voltage outlets such as a nominal 200V circuit. It also includes. In the outlet of the 100V circuit, a lower limit voltage value VL and an upper limit voltage value VH, which are threshold values for determining that the voltage between the power supply voltage electrode and the power supply ground electrode in the outlet in the wiring confirmation inspection is normal, are set. The lower limit voltage value VL is 90V, for example, and the upper limit voltage value VH is 120V, for example. Since the purpose of the wiring confirmation inspection is to inspect the appropriateness of the wiring work, the lower limit voltage value VL and the upper limit voltage value VH do not necessarily coincide with the voltage range in which the electrical equipment used by connecting to the outlet can be used. You don't have to.

  The display circuits L1, L2, L3, and L4 have a characteristic that the display start voltage is higher than the display stop voltage so that the display circuits L1, L2, L3, and L4 can be easily configured using a discharge tube. Here, the display stop voltage refers to a voltage at which display is stopped when the voltage applied to the display circuit that has once started display is gradually reduced. Now, the nominal voltage of the outlet circuit for performing the wiring check is 100 V, and if the voltage at the outlet is substantially within the range between the lower limit voltage value VL and the upper limit voltage value VH, the voltage is determined to be normal. The display circuit L1 and the display circuit L2 are configured to start display with a voltage value applied to both ends thereof that is lower than the lower limit voltage value VL. The voltage values at which the display circuit L1 and the display circuit L2 start displaying need not be the same voltage value. The display circuit L3 is configured so that display is started when the voltage applied to both ends thereof is substantially the lower limit voltage value VL (90 V). The display circuit L4 is configured so that display is started when the voltage applied to both ends thereof is substantially the upper limit voltage value VH (120V).

  FIG. 5 is a diagram illustrating a state in which each display circuit of the wiring tester 100 coupled to the outlet displays information corresponding to the state and voltage of the wiring system up to the outlet. From No. 1 to No. 20 in FIG. 5, it is assumed that the voltage supplied to the outlet is between the lower limit voltage value VL and the upper limit voltage value VH (hereinafter, this voltage is referred to as a normal voltage value). If the wiring tester 100 is coupled to the outlet, the power supply voltage terminal Lt is coupled to the power supply voltage pole of the outlet, the power supply ground terminal Nt is coupled to the power supply grounding pole of the outlet, and the ground terminal Et is coupled to the grounding pole of the outlet. The Therefore, if the power supply voltage line L is wired to the power supply voltage electrode of the outlet, the power supply ground line N is wired to the power supply grounding electrode of the outlet, and the grounding line E is wired to the grounding electrode of the outlet, the wiring tester 100 The power supply voltage line L is connected to the power supply voltage terminal Lt, the ground line E is connected to the ground terminal Et, and the power supply ground line N is correctly connected to the power supply ground terminal Nt.

  Since the wiring in this case is normal, normal voltage values are applied between the power supply voltage terminal Lt and the ground terminal Et and between the power supply voltage terminal Lt and the power supply ground terminal Nt. Only the circuit L3 displays (number 1). At this time, a half-wave rectified current flows through the display circuit L1 by the action of the rectifying element R1 and the rectifying element R3. The display circuit L4 does not display because the voltage value between the power supply voltage terminal Lt and the power supply ground terminal Nt is less than the display start voltage. The display circuit L2 is not displayed because the potential between the power supply ground terminal Nt and the ground terminal Et is substantially the same. When the power supply voltage line L is not connected to the power supply voltage terminal Lt in the state of number 1, no display circuit is displayed (number 2) because no voltage is generated. Further, when the ground line E is not connected to the ground terminal Et in the state of number 1, only the display circuit L3 displays (number 3). The display circuit L1 and the display circuit L2 are not displayed because the voltages applied to the power supply voltage terminal Lt and the power supply ground terminal Nt are divided by the respective impedances and are not applied to start the display. Further, when the power supply ground line N is not connected to the terminal Nt in the state of number 1, only the display circuit L1 displays (number 4). The display circuit L3 and the display circuit L2 are not displayed because the voltages applied to the power supply voltage terminal Lt and the ground terminal Et are divided by the respective impedances and do not reach the voltage for starting display.

  When the power supply ground line N and the ground line E are connected reversely to the electrode of the outlet, only the display circuit L1 and the display circuit L3 are displayed and the display state is the same as the number 1 (number 5). This is because the power supply ground line N and the ground line E are substantially at the same potential, and cannot be distinguished from the normal state (number 1), which will be described later. Further, when the power supply voltage line L is not connected to the power supply voltage terminal Lt in the state of number 5, none of the display circuits is displayed (number 6). Further, when the power supply ground line N is not connected to the ground terminal Et in the state of number 5, only the display circuit L3 displays (number 7). Further, when the ground line E is not connected to the power ground terminal Nt in the state of number 5, only the display circuit L1 displays (number 8).

  When the power supply voltage line L and the power supply ground line N are connected to the electrodes of the outlet in reverse, only the display circuit L2 and the display circuit L3 display (No. 9). At this time, the current half-rectified by the rectifying element R2 flows through the display circuit L2. Further, when the power supply voltage line L is not connected to the terminal Nt in the state of No. 9, neither display circuit is displayed (No. 10). When the ground line E is not connected to the ground terminal Et in the state of number 9, only the display circuit L3 displays (number 11). When the power supply ground line N is not connected to the power supply voltage terminal Lt in the state of No. 9, only the display circuit L2 displays (No. 12).

  When the power supply voltage line L and the ground line E are connected in reverse, only the display circuit L1 and the display circuit L2 display (number 13). Since the power supply voltage terminal Lt and the power supply ground terminal Nt have substantially the same potential, the display circuit L3 does not display. When the power supply voltage line L is not connected to the ground terminal Et in the state of No. 13, no display circuit is displayed (No. 14). In the state of No. 13, when the ground line E is not connected to the power supply voltage terminal Lt, only the display circuit L2 displays (No. 15). When the power ground line N is not connected to the power ground terminal Nt in the state of No. 13, only the display circuit L1 displays (No. 16).

  When the power supply voltage line L is connected to the ground terminal Et, the power supply ground line N is connected to the power supply voltage terminal Lt, and the ground line E is connected to the power supply ground terminal Nt, only the display circuit L1 and the display circuit L2 are connected. Display (No. 17). When the power supply voltage line L is connected to the power supply ground terminal Nt, the power supply ground line N is connected to the ground terminal Et, and the ground line E is connected to the power supply voltage terminal Lt, only the display circuit L2 and the display circuit L3 are connected. Display (number 18). When any two lines are not connected to any terminal and when three lines are not connected to any terminal, neither display circuit is displayed (number 19 and number 20).

  Reference numerals 21 and 22 indicate the operation of the display circuit when the wiring to the outlet is normal (the state of number 1) but the voltage is abnormal. When the voltage between the power supply voltage line L and the power supply ground line N is higher than the upper limit voltage value VH shown in FIG. 4, the display circuits L1, L3, and L4 display (No. 21). Since both ends of the display circuit L2 have substantially the same potential, they are not displayed. When the voltage value between the power supply voltage line L and the power supply ground line N is lower than the lower limit voltage value VL, the display circuit L3 does not display (number 22), and the voltage is higher than the display start voltage of the display circuit L1. When it is low, the display circuit L1 is not displayed.

  Although the operation state of the wiring tester 100 has been described above, the number 5 performs the same display operation as the normal wiring state of the number 1 in spite of erroneous wiring, and cannot be distinguished. Since the wiring tester according to the present embodiment tests the wiring state only with the voltage value applied between the terminals Lt, Nt, and Et, between the power supply ground line N and the ground line E at the same potential. Incorrect wiring connections cannot be distinguished only by the operation of the display circuit. However, since it operates to clearly distinguish the normal state from the pattern of abnormal states of many other wirings, it is sufficiently practical. In order to distinguish the number 5 state from the number 1 state, for example, the ground wire 33 is removed from the connection bar 21 of the distribution board 10 shown in FIG. Or open the power supply ground line N on the secondary side of the branch circuit breaker to form the state of No. 4 and compare it with the state of No. 8.

  The wiring tester 100 according to the present embodiment is further characterized in that it includes a rectifying element R1 and a rectifying element R2. That is, in the wiring confirmation inspection at the construction site, first, the wiring tester 100 is inserted into all outlets to be inspected, and the branch wiring breaker is opened in the distribution board shown in FIG. It is convenient in terms of procedure to measure the insulation resistance of the entire circuit system using an insulation resistance tester. At this time, the voltage terminal of the insulation resistance measuring instrument is connected to the power supply voltage line L, the ground terminal of the insulation resistance measuring instrument is connected to the ground line E, and the insulation resistance between the power supply voltage line L and the ground line E is measured. In this case, since the rectifying element R1 exhibits a high resistance to the DC voltage for measurement, the influence of the resistance of the display circuit of the wiring tester on the insulation resistance can be eliminated. The same applies to the measurement of the insulation resistance between the power supply voltage line L and the power supply ground line N.

  When measuring the insulation resistance between the power supply ground line N and the ground line E by connecting the voltage terminal of the insulation resistance tester to the power supply ground line N and connecting the ground terminal of the insulation resistance tester to the ground line E Since the rectifying element R2 exhibits a high resistance to the DC voltage for measurement, the influence of the resistance of the display circuit of the wiring tester on the insulation resistance can be eliminated. The characteristic that the insulation resistance can be measured with the wiring tester inserted into the outlet in this way will be described later.

[Circuit example and structure of wiring tester]
FIG. 6 is a diagram showing a circuit example of the wiring tester 200 according to the embodiment of the present invention. Each display circuit is composed of a neon lamp (discharge tube indicator lamp). The neon lamps 205, 209, 215, and 223 correspond to the display circuits L1, L2, L3, and L4 shown in the block diagram of FIG. 3, respectively. It can be obtained by specifying as LMH-5M type. Neon lamps 205, 209, 215, and 223 are selected as green, yellow, red, and yellow, respectively, so that they can be easily discriminated between normal and abnormal when applied to the wiring tester 200. Yes.

  A neon lamp is a glow discharge tube in which a metal electrode is provided in a transparent glass sphere and an inert gas such as neon or a mixed gas thereof is enclosed. Neon lamps have characteristics of a discharge start voltage and a discharge sustain voltage, which are determined by the electrode shape, the distance between electrodes, the type of sealed gas, and the pressure thereof. The discharge start voltage is a voltage at which glow discharge starts when the voltage applied to the neon lamp is gradually increased, and the discharge sustain voltage is a voltage at which the neon lamp that has once started discharge can maintain discharge. In a 100 V rated neon lamp, the discharge sustaining voltage is about 15 V lower than the discharge starting voltage. In addition, even with the same model number of neon lamp, the discharge start voltage is slightly different depending on the emission color, but the wiring tester according to the present embodiment is not intended to confirm the precise voltage value. It can fully function.

  In FIG. 6, resistors 207, 211, 217, and 227 are for preventing inductive noise, and a voltage equal to or lower than the discharge start voltage is applied to each neon lamp, or no voltage is applied at all. This prevents the phenomenon that the light is occasionally lit by the induced voltage. Moreover, the resistance which exists in a dashed-dotted line is a series stable resistance, and it functions to suppress the discharge current after discharge start to below a rated current. Series resistors 213 and 219 are connected to the neon lamp 215, and series resistors 221 and 229 are connected to the neon lamp 223.

  Between the power supply voltage terminal Lt and one terminal of the neon lamp 205, the semiconductor rectifier diode 201 is connected in a forward direction toward the power supply voltage terminal Lt. Further, the semiconductor rectifier diode 203 is connected between the ground terminal Et and the other terminal of the neon lamp 205 so as to be in the forward direction toward the other terminal of the neon lamp 205. The semiconductor rectifier diodes 201 and 203 correspond to the rectifier elements R1 and R2 in FIG. The power supply voltage terminal Lt, the ground terminal Et, and the power supply ground terminal Nt have the shape and arrangement of an insertion blade that can be inserted into the outlet of the outlet.

  Neon lamps 207, 211, 217, and 223 according to the present embodiment are all of the same model number, and the discharge start voltage and the discharge sustain voltage are slightly different due to the difference in emission color. In the tester 200, the timing at which each neon lamp is turned on or off with respect to the voltage applied between the terminals Lt, Et, and Nt is further different due to the action of the resistors 213, 219, 221 and 229.

  Neon lamps 205 and 209 are applied with half-wave rectified voltages between terminals Lt and Et and between terminals Nt and Et, respectively. A voltage between terminals Lt and Nt is divided by resistors 213 and 219 and applied to the neon lamp 215 after half-end rectification. The neon lamp 223 is applied with a voltage between terminals Lt and Nt divided by resistors 221 and 229 and half-rectified. Therefore, the terminal voltage between the terminals Lt and Et or the voltage between the terminals Nt and Et is directly applied to the neon lamp 205 or 209. Further, a higher voltage than that of the neon lamp 223 is applied to the neon lamp 215 with respect to the same voltage between the terminals Lt and Nt. When the voltage between the terminals Lt and Et is compared with the voltage between the terminals Lt and Nt, the neon lamp 205 is lit at the lowest voltage, the neon lamp 215 is lit at the next highest voltage, and the highest voltage. Neon lamp 223 is lit. If the voltage between the terminals Lt and Nt when the neon lamp 223 is lit is set to the upper limit voltage value (VH), the state where the voltage between Lt and Nt is abnormally high due to the lighting of the neon lamp 223 is displayed. can do. If the voltage between the terminals Lt and Nt when the neon lamp 215 is lit is set to the lower limit voltage value (VL), the voltage between the terminals Lt and Nt is abnormal because the neon lamp 215 is not lit. Can display a low state.

  FIG. 7 is a diagram showing a schematic structure of the wiring tester 200. The outer shape formed by the body 231, the insertion blades 233 and 235, and the neon lamp 230 is configured as a plug of an electric device coupled to an outlet. The neon lamp 230 corresponds to the neon lamps 205, 209, 215, and 223 shown in FIG. The fixing portion 237 is provided with a power supply voltage insertion blade 235, a grounding insertion blade 233, and a power supply grounding insertion blade. The power supply grounding insertion blade is a shadow of the power supply voltage insertion blade 235. And is not shown in the figure. Each insertion blade is arranged so that it can be inserted into the insertion port of each electrode of the outlet, and is configured so that the corresponding relationship of the insertion blade with respect to the electrode of the outlet is not erroneously inserted. The substrate assembly 239 is provided with resistors and rectifying elements, which are connected to each plug and neon lamp.

[Explanation of wiring confirmation inspection method using wiring tester]
The wiring test according to the present embodiment when the four branch circuit breakers provided in the distribution board 10 shown in FIG. A method of wiring confirmation inspection using the container 200 will be described. The wiring confirmation inspection consists of measurement of insulation resistance, circuit system test, and polarity test.

(1) Insertion of wiring tester First, the total number of wiring testers 200 is counted, and the wiring tester 200 is inserted into all outlets of the office involved in the test. The wiring tester 200 is small and manufactured at low cost, and a large number can be prepared even at a construction site. By inserting all the wiring testers 200 corresponding to the number of outlets scheduled in the design drawing into the outlet, the total amount of outlets installed can be confirmed.

(2) Measurement of insulation resistance Next, with the branch wiring circuit breaker 13 opened, a connection for forming the ground line E by applying the voltage terminal of the insulation resistance measuring instrument to the power supply voltage line L of the secondary wiring 23 The insulation terminal between the power supply voltage line L and the ground line E is measured by applying a ground terminal of the insulation resistance measuring instrument to the bar 21. The reason why the branch circuit breaker related to the measurement is opened is to prevent the occurrence of a sneak path on the transformer side. At this time, the wiring tester 200 does not affect the measurement result of the insulation resistance due to the action of the rectifier diode 201. Next, the ground terminal of the insulation resistance measuring instrument is applied to the power supply ground line N, and the insulation resistance between the power supply voltage line L and the power supply ground line N is measured. At this time, the wiring tester 200 does not affect the measurement result of the insulation resistance by the action of the rectifier diode 201. Next, the voltage terminal of the insulation resistance measuring instrument is applied to the power supply ground line N, and the ground terminal of the insulation resistance measuring instrument is applied to the ground line E. At this time, the wiring tester 200 does not affect the measurement result of the insulation resistance by the action of the rectifier diode 203. Similarly, the insulation resistance is measured in order for the circuit system including the other branch wiring breakers 15, 17, and 19.

(3) Circuit system test The circuit system test is a confirmation of whether or not a predetermined outlet is correctly connected to the branch circuit breaker system. Since insulation resistance has already been measured, voltage can be applied to the wiring to the outlet. First, only the branch wiring breaker 13 is turned on, and the light emission state of the neon lamp of the wiring tester 200 is confirmed. It can be confirmed that power is being sent from the branch circuit breaker 13 to the outlet into which the wiring tester emitting one of the neon lamps is inserted.

(4) Polarity test The polarity test is a test to check whether the power supply wiring is correctly connected to the outlet electrode and whether the voltage at the outlet electrode is normal. As described with reference to FIGS. 4 to 5, the inspection using the wiring tester 201 is determined to be normal when the neon lamp 205 (L1) and the neon lamp 215 (L3) display. When the display state is other than that or when no display circuit is displayed, it is determined that there is an error in the wiring or the supply voltage is abnormal. Therefore, the polarity test can be easily performed by confirming the display state of the display circuit.

  Similarly, a wiring test is performed on the circuit system of other branch wiring breakers. In this way, by preparing a large number of wiring testers 200 according to the present embodiment, after first inserting them into all outlets, an operator measures the insulation resistance from the distribution board, and then continues. , Circuit system test, polarity test can be performed. Therefore, if the outlet is in a position where it can be confirmed from the distribution board, the worker does not have to move from the place of the distribution board during the inspection. Even if it is necessary for the worker to move from the distribution board to check the display status of the wiring tester, it is only necessary to check the display status of the wiring tester that has been plugged into the outlet beforehand. Good. As a result of the wiring confirmation inspection actually using the wiring tester 200, the required time is reduced to about 1/3 compared with the inspection using the conventional tester.

It is a figure which shows the example of a connection of the transformer which supplies a power supply to an outlet socket. It is a distribution diagram of a distribution board which supplies power to an outlet. It is a block diagram for demonstrating the function of a wiring tester. It is a figure which shows the display start voltage of a display circuit. It is a figure which shows the display state of each display circuit of the wiring tester shown in FIG. It is a figure which shows the circuit example of a wiring tester. It is a figure which shows the structure of a wiring tester.

Explanation of symbols

200 Wiring tester 207, 211, 217, 227 Neon lamp 230 Neon lamp 231 Body 233 Grounding insertion blade 235 Power supply voltage insertion blade 237 Fixing part 239 Substrate assembly

Claims (3)

A wiring tester including a power supply voltage electrode, a power supply ground electrode, and a ground electrode, and an insertion blade that can be inserted into an outlet connected to an AC voltage source,
A power supply voltage insertion blade connectable to the power supply voltage electrode;
An insertion blade for grounding that can be coupled to the grounding electrode;
A power grounding insertion blade that can be coupled to the power grounding pole;
A first rectifying element having a cathode connected to the power supply voltage plug;
A second rectifying element having an anode connected to the grounding plug;
A first display circuit connected to the anode of the first rectifying element and the cathode of the second rectifying element;
A second display circuit connected to the power grounding plug and the cathode of the second rectifying element;
A wiring tester comprising: a third display circuit connected to the power grounding plug and the anode of the first rectifying element.   And a fourth display circuit connected to the power grounding insertion blade and an anode of the first rectifying element, wherein the third display circuit includes the power supply voltage insertion blade and the power grounding difference. Display is started at the lower limit voltage value applied between the insertion blade and the first display circuit is applied with the lower limit voltage applied between the power supply voltage insertion blade and the power supply ground insertion blade. Display is started at a voltage value lower than the value, and the second display circuit displays a voltage value lower than the lower limit voltage value applied between the power supply grounding insertion blade and the grounding insertion blade. 2. The display according to claim 1, wherein the fourth display circuit starts display at a voltage value higher than the lower limit voltage value applied between the power supply voltage insertion blade and the power supply ground insertion blade. Wiring tester.   The first rectifier element and the second rectifier element are semiconductor rectifier diodes, and the first display circuit, the second display circuit, the third display circuit, and the fourth display circuit are neon The wiring tester according to claim 2, comprising a lamp or a light emitting diode.

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