JP5678253B2 - Inspection device for switch for distribution line - Google Patents

Description

  The present invention relates to an inspection device for inspecting a distribution line switch used as a section switch or the like.

  In the power distribution system, for example, as shown in Patent Document 1, in order to reduce the power outage range at the time of an accident or work, or to disconnect the accident section from the healthy section, a section switch is connected to the distribution line. Thus, the distribution line is divided into a plurality of sections. In addition, in order to perform control of each division switch and communication with a master station installed in a substation or the like, a switch slave station is provided for each switch, and each switch and switch The station is connected with a cable. The switch slave station controls the switching on and off of the switch according to instructions given by a higher-level station, such as a master station installed at a power company sales office, as well as the system information at the switch installation location. Transmitting to a station, or relaying communication performed between the master station and other switch slave stations.

  A distribution switch is basically a switch that includes an electromagnetic switch connected in series to a distribution line and an operation circuit that supplies an excitation current to a closing coil of the electromagnetic switch. In order to give an accident detection function to a switch for distribution lines, various sensors are often built in.

  For example, in the section switch shown in Patent Document 1, in addition to the electromagnetic switch connected in series to the distribution line to open and close the load current, the zero phase that detects the zero phase current that flows when a ground fault occurs is detected. A current transformer (ZCT), a zero-phase voltage transformer (ZPD) that detects a zero-phase voltage generated in the event of a ground fault, and a current transformer that detects an overcurrent as sensors for detecting the state of the distribution line Housed in a case.

  In the distribution system, based on communication between the upper station such as the master station installed in the sales office of the electric power company installed in the substation and the location where each switch is installed, and instructions from the upper station In order to control each switch, a switch slave station is provided for each switch for distribution, and each switch is connected to the switch slave station by a connection cable. The switch slave station controls the switching on and off of the switch according to the command given by the host station, transmits the system information at the switch installation location to the host station, The relay of the communication performed between the switch slave stations is performed.

  In order to control the distribution line switch, the distribution voltage between the two phases on both sides of the installation point is obtained in order to obtain the power supply voltage of the switch slave station and the distribution line voltage information on both sides of the installation point (segmentation point). The 1st and 2nd power supply transformer which takes in an electric wire voltage is required. In the section switch shown in Patent Document 1, these power transformers are provided outside the switch case, but these power transformers may be built in the switch case.

  In order to connect a switch slave station to each section switch, the output of various sensors such as a zero-phase current transformer and a zero-phase voltage transformer housed in the case is taken out from the case of the distribution line switch A metal outlet for measurement having a plurality of terminals and a metal outlet for operation having a plurality of terminals connected to the operation circuit of the electromagnetic switch were attached as a switch-side metal outlet, and one end was connected to the switch slave station. The plugs attached to the other ends of the measurement cable and the operation cable are connected to the operation metal outlet and the measurement metal outlet, thereby connecting the switch and the switch slave station. .

JP-A-8-223788

  In distribution line switches, the output of sensors such as zero-phase current transformers and zero-phase voltage transformers housed in cases together with electromagnetic switches is measured on the slave station side to detect the presence or absence of abnormalities in the switches. Like to do. There is no particular problem when the switch is operating normally, but if the switch operates abnormally with no abnormalities in the distribution line, the cause is on the switch side. It is necessary to identify what is on the side. Moreover, it is necessary to inspect the state of the components of the switch during maintenance inspection.

  Conventionally, when inspecting whether there is an abnormality inside the switch for distribution, after removing the slave station from the switch, the operator holds the pair of measuring terminals of the tester by hand and holds both measuring terminals. The sensor output check, component resistance measurement, or continuity test is performed by contacting a predetermined terminal selected from the group of terminals on the metal outlet attached to the switch case. It was. However, since the metal outlet provided in the switch incorporating various sensors has a very large number of terminals, when the switch is inspected by the above method, the measurement terminal of the tester There was a risk that the test could not be performed correctly due to the wrong location. Also, if the tester's measurement terminal is held by hand and brought into contact with the metal outlet's terminal, the contact resistance is unstable, and there is a risk that the resistance value or voltage cannot be measured accurately. It was.

  Furthermore, the work of applying the pair of measurement terminals of the tester to the pair of terminals selected from a large number of terminals of the metal outlet needs to be performed with both hands, which may be difficult depending on the location of the switch. there were. In particular, when a switch is mounted, it is dangerous to handle the measuring terminal of the tester with two-handed work because it is a work at a high place.

  The switch slave station has a function to measure the output of the sensor in the switch and a function to send the measured data to the outside by communication, and the measured value measured by the slave station by communication. If it can be taken out to the outside, use a personal computer to communicate with the slave station and obtain the measured value data to determine whether the abnormality is on the switch side or the slave station side. It is possible to analyze. However, when the slave station does not have a function of transmitting measurement data to the outside, such a method cannot be taken, and the switch inspection must be performed directly through a metal outlet.

  The purpose of the present invention is to check the output of sensors such as current transformers and voltage transformers, measure resistance values, check continuity, etc. It is an object of the present invention to provide an inspection device for a distribution line switch which can be performed without causing a risk of erroneous inspection locations.

  The present invention relates to an inspection apparatus for inspecting a distribution line switch used as a section switch or the like. A switch for inspection by an inspection apparatus according to the present invention includes a plurality of components including an electromagnetic switch inserted in series with respect to a distribution line and at least one sensor for measuring the voltage or current of the distribution line in a case. It has the structure accommodated in. The case has a switch-side metal outlet having a terminal group including terminals connected to both ends of each of the plurality of components in order to connect a cable that connects between the internal components and the switch slave station. Is attached. The inspection apparatus according to the present invention uses a plurality of components in the case of the distribution line switch as described above as inspection objects, and performs inspection of these inspection objects by a tester from the outside of the case. This is done through an outlet.

  In the present invention, the inspection side having a terminal group consisting of terminals corresponding to each terminal of the switch side metal outlet and connected to the switch side metal outlet through the inspection cable in a state where the switch slave station is removed. A tester that has a metal outlet and a pair of measurement terminals and can switch the measurement mode to at least the voltage measurement mode and the resistance value measurement mode, and is provided between the tester and the terminal group of the inspection side metal outlet. The pair of test terminals of the tester and the metal outlet on the inspection side are switched and connected to both ends of the plurality of inspection objects through the inspection side metal outlet, the inspection cable, and the switch side metal outlet. A switch for switching the connection between the terminal group and the inspection side metal outlet, tester, and switching Switch was supported by a common frame.

  With the above configuration, a current transformer or voltage can be used without holding the tester measurement terminal by hand and making contact with the metal contact terminals of the switch, and without causing the possibility of erroneous inspection locations. It is possible to perform tests such as checking the output of a sensor such as a transformer, measuring resistance, and checking continuity.

  In addition, when configured as described above, the test terminal of the tester is securely connected to each inspection object of the switch through a metal outlet, so that when holding the measurement terminal by hand and contacting the terminal of the metal outlet, The electrical connection between the measuring terminal and the test object becomes unstable, which can prevent resistance measurement errors and voltage measurement errors from increasing, allowing accurate testing. be able to.

In the present invention, the changeover switch is provided between the tester and the terminal group of the inspection side metal outlet, and a plurality of inspection objects are passed through one of the measurement terminals of the tester through the inspection cable and the switch side metal outlet. The first changeover switch element for switching and connecting to a plurality of terminals of the inspection side metal outlet to be connected to one end of each of the tester and the other side of the tester provided between the tester and the terminal group of the inspection side metal outlet Second switching element for switching and connecting the measurement terminal to the plurality of terminals of the inspection side metal outlet to be connected to the other end of each of the plurality of inspection objects through the inspection cable and the switch side metal outlet It is constituted by the. The first changeover switch element and the second changeover switch element are provided so as to operate in conjunction with each other, and when in the same changeover position, the pair of measurement terminals of the tester are opened and closed with the inspection side metal outlet and the inspection cable. It is configured to be electrically connected to one end and the other end of the same inspection object through the container side metal outlet.

  In a preferred aspect of the present invention, when the switch to be inspected includes a zero-phase current transformer, a zero-phase voltage transformer, and an overcurrent detection current transformer as sensors, the zero-phase current transformer When the zero-phase voltage transformer and the overcurrent detection current transformer are to be inspected, the burden resistance connected between the pair of measurement terminals is between the changeover switch and the terminal group of the inspection side metal outlet. Is provided.

  If the burden resistance is provided as described above, the output voltage of the zero-phase current transformer, the zero-phase voltage transformer, and the overcurrent detection current transformer can be accurately checked.

  In a preferred aspect of the present invention, a display indicating the type of the inspection object to be connected to the measurement terminal of the tester when the changeover switch is in each changeover position is provided in the vicinity of the operation unit for changing over the changeover switch. It has been.

  If the display as described above is provided, it is possible to inform the operator what the inspection object is connected to the tester, and therefore it is possible to eliminate the possibility of erroneous inspection items for each inspection object.

  In another preferred aspect of the present invention, the tester is detachably attached to the frame.

  If the tester is detachably attached to the frame, the tester can be detached from the frame and used alone. In addition, when a plurality of types of testers having different measurement ranges are required at the time of inspection, the testers can be easily replaced. A general-purpose tester (multimeter) having a predetermined accuracy can be used as the tester.

  The switch side metal outlet attached to the case side of the switch to be inspected by the present invention may consist of a single metal outlet or a plurality of metal outlets.

  In many cases, the switch-side metal outlet provided for connecting the switch slave station to the switch is a switch-side measurement metal outlet having a terminal group for taking out the sensor output and giving it to the slave station, It is composed of two metal outlets, a switch-side operation metal outlet and a terminal group connected to the operation circuit of the electromagnetic switch. When the power transformer that takes in the voltage between the two phases of the distribution line is built in the case of the switch, the terminal connected to the output terminal of the power transformer along with the terminal connected to the operation circuit in the metal outlet for operation on the switch side A group is provided. As mentioned above, when the switch-side metal outlet is composed of two metal outlets, the switch-side measurement metal outlet and the switch-side operation metal outlet, the switch-side measurement metal outlet and the switch side It is preferable that the inspection side metal outlet is constituted by the inspection side measurement metal outlet and the inspection side operation metal outlet corresponding to the operation metal outlets.

  Also, in order to be able to handle both cases where the power transformer is built in the switch case and when it is not built in, the switch case is a metal outlet for inspection side operation provided on the inspection device side. Two inspections, a first inspection-side operation metal outlet corresponding to the case where the power transformer is built in, and a second inspection-side operation metal outlet corresponding to the case where the power transformer is not built in the switch case. It is preferable to provide a side operation metal outlet. With this configuration, the same inspection device should be used to inspect both types of switches that have a built-in power transformer in the case and switches that do not have a power transformer in the case. Therefore, the versatility of the inspection apparatus can be improved.

  According to the present invention, inspection of sensor outputs such as current transformers and voltage transformers, inspection of resistance values, continuity check, and the like can be performed without the work of bringing the measurement terminals of the tester into contact with the metal contacts one by one. In addition, the inspection can be performed without causing the possibility of erroneous inspection locations or erroneous inspection items.

  Further, according to the present invention, since the measurement terminal of the tester can be securely connected to each inspection object of the switch through the metal outlet, the measurement terminal is held by hand and brought into contact with the terminal of the metal outlet. , The electrical connection between the measuring terminal and the object to be inspected becomes unstable, which prevents errors in resistance measurement and increases in voltage measurement error. Can be done.

It is the front view which showed an example of the state which connected the test | inspection apparatus concerning one Embodiment of this invention to the switch. It is a side view of the inspection apparatus shown in FIG. It is a top view of the inspection apparatus. It is the circuit diagram which showed the circuit structure of the test | inspection apparatus concerning one Embodiment of this invention with the circuit structure of the switch made into the test object.

  1 to 3 show an appearance of an inspection apparatus according to an embodiment of the present invention and an example of an appearance of a switch for a distribution line that is inspected by the inspection apparatus. In FIG. 1, reference numeral 1 is a distribution line switch configured to be used as a section switch, and 2 is an inspection apparatus according to the present invention. The switch 1 includes an electromagnetic switch that opens and closes a load current flowing through the distribution line, an operation circuit of the electromagnetic switch, sensors such as a zero-phase current transformer, a zero-phase voltage transformer, and an overcurrent detection current transformer, It has a structure in which components including a power transformer that takes in the distribution line voltage are housed in a metal case 101. The case 101 is composed of an upper case 101A having an open lower end and a lower case 101B having an open upper end. The upper case 101A is fitted to the lower end of the upper case 101A so that both cases 101A and 101B are bolted. And it has the structure connected by the connection part 103 fastened by the fastening means 102 which consists of nuts. When the internal pressure of the case 101 rises excessively, the connecting portion 103 between the upper case and the lower case is deformed to form a gap between the two cases without dropping the lower case, Has the function of releasing the internal pressure.

  Three-phase bushing terminals 104u to 104w and 105u to 105w to which distribution lines on both sides of the dividing point are connected are attached to opposing side walls of the upper case 101A. The bushing terminals 104u to 104w and 105u to 105w are arranged in such a manner that their respective axes are oriented in the horizontal direction in the mounted state, and the respective base portions penetrate through the opposite side walls of the upper case 101A. 101 is attached. The center conductors of the bushing terminals 104u to 104w and 105u to 105w are connected to each other in the case 101 through an electromagnetic switch not shown in FIG.

  A switch-side measurement metal outlet 111 and a switch-side operation metal outlet 112 are attached as switch-side metal outlets to the lower part of the front side wall of the upper case 101A. Each of these metal outlets is made of a receptacle, and includes a terminal group consisting of a large number of terminals (male terminals or female terminals) connected to the components housed in the case 101 in a metal outlet housing. It has a structure. A measuring cable and an operating cable having one end connected to a switch slave station (not shown) mounted in the vicinity of the switch 1 are respectively connected to the switch-side measurement metal outlet 111 and the switch-side operation metal outlet 112. A plug of a metal outlet connected to the other end of the switch is connected, and the switch 1 and a switch slave station (not shown) are connected through the measurement cable and the operation cable. The measurement cable is a cable with a shield coating suitable for transmitting sensor signals, and the operation cable is supplied from the power transformer to the switch slave station or from the switch slave station to the operation circuit. It is a cable that can flow the current that flows without loss.

  The switch-side measurement metal outlet 111 is provided to take out the output of the sensor housed in the case 101 and give it to the switch slave station. In the terminal group provided in the metal outlet 111, the output terminals of the zero-phase current transformer, the zero-phase voltage transformer, and the overcurrent detection current transformer housed in the case 101 are connected through predetermined wirings. It is connected.

  The switch-side operation metal outlet 112 connects an operation circuit that controls the supply of excitation current to the coil of the electromagnetic switch to the switch slave station, and steps down the voltage between the two phases of the distribution lines on both sides of the division point. Provided to connect the output terminals of the single-phase first and second power transformers that supply the slave station with the power supply voltage and the distribution line voltage information on both sides of the dividing point to the switch slave station. Thus, the terminal group provided in the metal outlet 112 is connected to the operation circuit accommodated in the case 101 and the output terminals of the first and second power transformers.

  In the present embodiment, the first and second power transformers are housed in the case 101 of the switch. However, depending on the switch, these power transformers may be disposed outside the case 101. When the power transformer is disposed outside the case 101, a switch-side operation metal outlet 112 having only a terminal group to which an electromagnetic switch operation circuit is connected is used. That is, the number of terminals of the switch-side operation metal outlet 112 is different depending on whether the power transformer is accommodated in the case of the switch or not.

  As described above, the measurement cable and the operation cable connected to the switch slave station are connected to the metal outlets 111 and 112 attached to the case 101 of the switch 1 at the normal time. When performing, the inspection apparatus 2 according to the present invention is connected to the metal outlets 111 and 112 of the switch 1 through the first and second inspection cables 3 and 4 instead of the switch slave station.

  The first inspection cable 3 is a cable suitable for transmitting a sensor signal in the same manner as the measurement cable used for connecting between the sensor in the switch 1 and the switch slave station. The second inspection cable 4 is supplied from the power transformer to the switch slave station in the same manner as the operation transformer used for connecting the power transformer and the operation circuit in the switch 1 to the switch slave station. The cable is suitable for flowing current and current supplied from the switch slave station to the operation circuit without causing a large loss. As the first and second inspection cables 3 and 4 used when the inspection device 2 is connected to the switch 1, the measurement cable and the operation cable connected between the switch 1 and the switch slave station are used. The cable may be used as it is, or a dedicated cable prepared for connecting the inspection apparatus 2 may be used.

  The inspection apparatus 2 shown in FIGS. 1 to 3 has a terminal group consisting of terminals corresponding to the terminals of the switch-side metal outlets 111 and 112, and the switch with the switch slave station removed. It has inspection side metal outlets 201 and 202 connected to the side metal outlets 111 and 112 through the inspection cables 3 and 4 and a pair of pin-like measurement terminals 211 and 212, and the measurement mode is at least the voltage measurement mode and the resistance. The tester 210 that can be switched to the value measurement mode, the pair of measurement terminals 211 and 212 of the tester 210, and the terminal group of the inspection side metal outlets 201 and 202, and the pair of measurement terminals of the tester 210 211, 212, inspection side metal outlets 201, 202, inspection cables 3, 4, and switch side metal outlets 111, 112; Switching for switching the connection between the pair of measurement terminals 211 and 212 and the terminal group of the inspection side metal outlets 201 and 202 so as to switch and connect to both ends of each of the plurality of inspection objects in the case of the switch 1 The switch 220 is supported by a common frame 230.

  Of the inspection side metal outlets 201 and 202 provided in the inspection apparatus 2, 201 is an inspection side measurement metal outlet corresponding to the switch side measurement metal outlet 111, and 202 is a switch side operation metal outlet 112. This is a metal outlet for inspection and operation. In this embodiment, when the power transformer for taking in the voltage between the two phases of the distribution line is incorporated in the case 101 of the switch 1 to be inspected as the inspection-side operation metal outlet 202, the case of the switch 1 The first inspection-side operation metal outlet 202A corresponding to the switch-side operation metal outlet 112 attached to the power supply and the power source for taking in the voltage between the two phases of the distribution line into the case 101 of the switch 1 to be inspected Two inspection-side operation metal outlets are provided, which are a second inspection-side operation metal outlet 202B corresponding to the switch-side operation metal outlet 112 that is attached to the case 101 of the switch 1 when a transformer is not incorporated. Yes. One of the first and second inspection-side operation metal outlets 202A and 202B is used depending on whether or not the switch 1 has a built-in power transformer. In the present embodiment, since the power transformer is built in the case 101 of the switch 1, the first inspection side operation metal outlet 202A is used. A cover 205 that protects the terminal group is attached to the inspection-side operation metal outlet 202B that is not used.

  The tester 210 is a general-purpose tester in which a measurement circuit is accommodated in a rectangular parallelepiped housing 213. On the surface of the housing 213, a rotary switching lever 214 that is operated when switching the measurement mode, and a measured value are digitally displayed. A liquid crystal display panel 215 is provided, and a pair of measurement terminals 211 and 212 are led out from one end in the longitudinal direction of the housing 213 through cords 216 and 217.

  The illustrated frame 230 is formed at a position adjacent to the first box-shaped portion 230a having a rectangular parallelepiped shape and a thickness greater than that of the first box-shaped portion. The second box-shaped portion 230b is integrally formed and a hollow box body is formed in which a step 230c is formed between the first box-shaped portion 230a and the second box-shaped portion 230b. In the illustrated frame 230, a recess for accommodating the tester 210 is formed between the first box-shaped portion 230a and the second box-shaped portion 230b, and the tester 210 is disposed in this recess. Both ends of the U-shaped fixing fitting 231 fitted on 210 are fastened to the frame 230 by screws 232, so that the tester 210 is fixed to the frame 230 in a detachable state. With the tester 210 attached to the frame in this manner, the surface of the housing of the tester 210 and the surface 230b1 of the second portion 230b of the frame 230 are substantially flush with the first portion 230a of the frame 230. The height of the step 230c between the second portion 230b is set.

  A pair of female connectors (not specifically shown) to which a pair of measurement terminals (pin-shaped terminals) 211 and 212 of the tester 210 are connected are attached to the end of the first box-shaped portion 230a of the frame 230. A pair of measurement terminals 211 and 212 of the tester are attached and are connected to the changeover switch 220 in the frame 230 through these connectors.

  An inspection-side metal outlet 201 is attached to the surface 230b1 side of the second box-shaped portion 230b of the frame 230, and an inspection-side operation is performed on the end surface of the second box-shaped portion 230b opposite to the first box-shaped portion 230a. Metal outlets 202A and 202B are attached.

  When performing an inspection operation at a high place such as on a power pole, it is preferable to suspend the inspection device 2 from the operator's neck in order to open both hands of the operator. Therefore, in the illustrated example, a hanging strap 240 that is used when an operator suspends the inspection device 2 from the neck is attached to the end of the frame 230 on the second box-shaped portion 230b side.

  The changeover switch 220 is a manually operated cam switch that opens and closes a large number of contacts as the cam rotates, and causes the cam operating shaft to protrude outward from the surface of the second box-shaped portion 230b of the frame 230. In this state, it is attached to the frame 230, and an operation lever 221 is attached to its operation shaft. In the vicinity of the operation lever (operation unit) 221 of the changeover switch 220, a display indicating the type of the inspection object to be connected to the measurement terminal of the tester 210 when the changeover switch 220 is in each changeover position is provided. ing. In the illustrated example, the display panel 222 is attached to the surface of the second box-shaped portion 230b of the frame 230, and the operation lever 221 is positioned at the position indicated by the tip of the operation lever 221 when the operation lever 221 is in each switching position. On the display panel 222, a display (display such as ZCT, ZPD, CT, etc.) indicating the type of the inspection object to be connected to the measurement terminal of the tester at each switching position is printed.

  As will be described later, in the present embodiment, the changeover switch 220 includes a first changeover switch element for switching and connecting one measurement terminal 211 of the tester to the terminal group of the inspection side metal outlets 201 and 202A, and the other measurement of the tester. A second switching switch element that switches and connects the terminal 212 to the terminal group of the inspection side metal outlets 201 and 202A, and these switch elements perform a switching operation in conjunction with each other, whereby a pair of measurement of the tester 210 is performed. The terminals 211 and 212 are switched and connected to both ends of a plurality of inspection objects in the switch case through the inspection side metal outlets 201 and 202, the inspection cables 3 and 4, and the switch side metal outlets 111 and 112, respectively. Therefore, a pair of measuring terminals 211, 212 and an inspection side metal socket Switching the connection between the terminal groups of bets 201,202.

  Next, referring to FIG. 4, the electrical configuration of the switch 1, the changeover switch 220, the contact of the changeover switch, the connector to which the measurement terminals 211 and 212 of the tester 210 are connected, and the terminal of the inspection side metal outlet The configuration of the switching circuit configured inside the frame 230 by the wiring connected to the group will be described.

  The switch 1 shown in FIG. 4 includes three-phase electromagnetic switches 10u, 10v, and 10w as switches that open and close the load current. These switches are arranged in the case 101, and one end of each switch is connected to one of the distribution lines on both sides of the dividing point through the wirings 11u, 11v and 11w and the bushing terminals 104u, 104v and 104w. Is done. The other ends of the electromagnetic switches 10u, 10v and 10w are connected to the other distribution line among the distribution lines on both sides of the dividing point through the wirings 12u, 12v and 12w and the bushing terminals 105u, 105v and 105w.

  A zero-phase current transformer ZCT is attached to the wires 11u to 11w, and one end of the ZCT is connected to the earth line 13 provided in the case 101. Further, a zero-phase voltage transformer ZPD is connected to the wirings 12u to 12w. The ZPD has capacitors Cu, Cv, Cw having one end connected to the wirings 12u to 12w and the other end commonly connected, and a capacitor C1 connected between the common connection point of the capacitors Cu to Cw and the earth line 13. And a voltage transformer PT for an instrument having a primary coil connected to both ends of the capacitor C 1. One end of the secondary coil is connected to the earth line 13.

  In order to detect overcurrent, overcurrent detection current transformers CTu and CTw for detecting current flowing in the U-phase and W-phase distribution lines are mounted on the wirings 12u and 12w, and one end of each of these current transformers is grounded. Connected to line 13.

  In the case 101, the first power transformer TR1 and the second power transformer TR2 that take in the voltage between the two phases of the distribution lines and the electromagnetic switches 10u to 10w are turned on on both sides of the electromagnetic switches 10u to 10w. The energizing coil 42C to be excited, the holding coil 42H to be energized when the electromagnetic switches 10u to 10w are completely energized, and mechanical when the electromagnetic switches 10u to 10w are turned on and off, respectively. When the electromagnetic switches 10u to 10w are turned on and turned off, they are mechanically turned off and turned on, respectively. A normally closed auxiliary contact 42b is accommodated. The auxiliary contact 42a is a contact that always takes the same state as the electromagnetic switches 10u to 10w, and is provided to detect the state of the electromagnetic switches 10u to 10w.

  The primary coil of the first power supply transformer TR1 is connected to wirings 11u and 11w connected to the U-phase and W-phase distribution lines, and the primary coil of the second power supply transformer TR2 is connected to the U-phase and W-phase distribution lines. It is connected to the wirings 12u and 12w. One ends of the secondary coils of the first power supply transformer TR1 and the second power supply transformer TR2 are connected to the earth line 13.

  In the illustrated example, a lightning arrester LA connected between the wirings 11 u to 11 w and the earth line 13 and between the wirings 12 u to 12 w and the earth line 13 is accommodated in the case 101. The earth line 13 is grounded through the earth line 14.

  A switch-side measurement metal outlet 111 and a switch-side operation metal outlet 112 are attached to the case 101 of the switch. The switch-side measuring metal outlet 111 is provided with a terminal group consisting of seven terminals from No. 1 to No. 7 indicated by terminal numbers with round numbers 1 to 7, and this switch side measurement The first terminal of the metal outlet 111 is connected to the earth line 13, and the second and third terminals are connected to the non-grounded terminal of the current transformer CTw and the non-grounded terminal of the current transformer CTu, respectively. Has been. The 4th and 5th terminals of the switch-side measurement metal outlet 111 are connected to the non-ground side terminal of ZCT and the non-ground side output terminal of ZPT, respectively. The terminal No. and the terminal No. 7 are connected to the earth line 13.

  The switch-side operation metal outlet 112 is provided with a terminal group consisting of seven terminals from No. 1 to No. 7 indicated by terminal numbers indicated by 1 to 7 of the round numbers. One terminal of a parallel circuit of the holding coil 42H and the contact 42b is connected to the number terminal, and one end of the contact 42a is connected to the second terminal. The third terminal of the metal outlet 112 is connected to the terminal opposite to the holding coil 42H of the closing coil 42C, and the other terminal of the contact 42a is connected to the fourth terminal. That is, the operation circuit of the electromagnetic switch is connected to the first terminal to the fourth terminal.

  The 5th and 6th terminals of the switch-side operation metal outlet 112 are connected to the non-ground side terminal of the secondary coil of the power transformer TR1 and the non-ground side terminal of the secondary coil of the power transformer TR2, respectively. The seventh terminal is connected to the earth line 13.

  The metal outlet 112 ′ shown in FIG. 4 is a switch-side operation metal outlet that is attached to the case 101 instead of the metal outlet 112 when the power transformers TR 1 and TR 2 are not provided in the case 101. Since this metal outlet 112 'does not require the 5th to 7th terminals connected to the power transformers TR1 and TR2, it has only the 1st terminal to the 4th terminal. When the metal outlet 112 ′ is attached to the case 101 instead of the metal outlet 112, the first to fourth terminals of the metal outlet 112 ′ are the first to fourth terminals of the metal outlet 112 in FIG. 4. Is connected to the same location where is connected.

  An inspection-side measurement metal outlet 201, an inspection-side operation metal outlet 202A, and a second inspection-side operation metal outlet 202B are attached to the frame 230 of the inspection apparatus 2. The inspection-side measurement metal outlet 201 has first to sixth terminals corresponding to the first to sixth terminals of the switch-side measurement metal outlet 111, respectively. The metal outlet 202A has first to seventh terminals corresponding to the first to seventh terminals of the switch-side operation metal outlet 112, respectively. In addition, the second inspection-side operation metal outlet 202B used when the power transformers TR1 and TR2 are not built in the switch scale does not require a terminal group connected to the power transformers TR1 and TR2. Only terminals No. 4 to No. 4 are provided.

  The changeover switch 220 includes a first changeover switch element 220A that performs a changeover operation in conjunction with each other, and a second changeover switch element 220B. Each changeover switch element has a movable contact numbered 1 in the figure and a fixed contact numbered 2-9, numbered 2-9, and rotates the operating lever 221. Thus, the movable contact can be brought into contact with the second to ninth fixed contacts, and when the operation lever 221 is in each switching position, the pair of measurement terminals 211 and 212 of the tester are inspected. Through the side metal outlets 201 and 202, the inspection cables 3 and 4, and the switch side metal outlets 111 and 112, they are electrically connected to one end and the other end of the same inspection object.

  The movable contacts of the first and second changeover switch elements 220A and 220B are connected to measurement terminals 211 and 212 of the tester, respectively. The second to fourth fixed contacts of the first changeover switch element 220A are commonly connected to the first terminal of the inspection-side measuring metal outlet 201, and the fifth fixed contact of the first changeover switch element 220A is connected to the inspection side. It is connected to the 6th terminal of the measurement metal outlet 201. The 6th and 7th fixed contacts of the first changeover switch element 220A are connected to the 3rd and 4th terminals of the first inspection-side operation metal outlet 202A, respectively. The ninth fixed contact is commonly connected to the seventh terminal of the first inspection-side operation metal outlet 202A.

  The fixed contacts No. 2 to No. 5 of the second changeover switch element 220B are connected to the No. 2 to No. 5 terminals of the inspection-side measuring metal outlet 201, respectively, and the No. 6 No. of the second changeover switch element 220B is connected. The fixed contact and the seventh fixed contact are connected to the first terminal and the second terminal of the first inspection side operation metal outlet 202A, respectively. The 8th and 9th fixed contacts of the second changeover switch element 202A are connected to the 5th and 6th terminals of the first inspection-side operation metal outlet 202A, respectively.

  The first through fourth terminals of the second inspection side metal outlet 202B are connected to the first through fourth terminals of the first inspection side metal outlet 202A, respectively.

  The inspection cable 3 for connecting between the switch-side measurement metal outlet 111 and the inspection-side measurement metal outlet 201 is composed of a cable in which six insulation-coated cores are shield-coated. Plugs 301 and 302 connected to the switch-side measurement metal outlet 111 and the inspection-side measurement metal outlet 201 are connected to one end and the other end of the cable 3, respectively. The plug 301 has first to seventh terminals corresponding to the first to seventh terminals of the switch-side measurement metal outlet 111, and the plug 302 is the first to seventh terminals of the inspection-side measurement metal outlet 201. The first to sixth terminals corresponding to the sixth terminal are provided. The 1st to 6th terminals of the plug 301 are connected to the 1st to 6th terminals of the plug 302 through the 6 wire cores of the inspection cable 3, respectively, and the 7th terminal of the plug 301 is the shield covering of the cable 3. It is connected to the.

  The inspection cable 4 connecting the switch-side operation metal outlet 112 and the first inspection-side operation metal outlet 202A is composed of a cable having seven insulation-coated cores. Plugs 401 and 402 connected to the switch-side operation metal outlet 112 and the first inspection-side operation metal outlet 202A are connected to one end and the other end of the cable 4 respectively. The plug 401 has terminals 1 to 7 corresponding to the terminals 1 to 7 of the switch-side operation metal outlet 112, respectively, and the plug 402 is Nos. 1 to 7 of the inspection-side operation metal outlet 202A. No. 1 to No. 7 terminals respectively corresponding to the No. terminals are provided. The first through seventh terminals of the plug 401 are connected to the first through seventh terminals of the plug 402 through the seven wire cores of the inspection cable 4, respectively.

  Since the switch to be inspected does not incorporate the power transformers TR1 and TR2, the first to fourth terminals are used instead of the switch-side operation metal outlet 112 having the first to seventh terminals. When the switch-side operation metal outlet 112 ′ is attached to the switch case 101, it has the first to fourth terminals corresponding to the first to fourth terminals of the metal outlet 112 ′, respectively. A plug 401 ′ is connected to one end, and a plug 402 ′ having terminals 1 to 4 corresponding to the terminals 1 to 4 of the second inspection-side operation metal outlet 202B is connected to the other end 4 By connecting the plugs 401 'and 402' to the metal outlets 112 'and 202B, respectively, using the test cable 4' for the heart, Connecting the work circuit to the inspection device 2.

  The switch-side metal outlet 111 and the inspection-side measurement metal outlet 201 are provided between the first and second terminals of the inspection-side measurement metal outlet 201 and between the first and third terminals, respectively. Are connected to the output terminals of the current transformers CTw and CTu, respectively, and connected to the first terminal of the inspection-side measuring metal outlet 201. Between the No. 4 terminal, there is a burden resistor R3 connected between the output terminals of the ZCT when the switch side metal outlet 111 and the inspection side measurement metal outlet 201 are connected by the inspection cable 3. It is connected. In addition, when the switch-side metal outlet 111 and the inspection-side measurement metal outlet 201 are connected by the inspection cable 3 between the fifth and sixth terminals of the inspection-side measurement metal outlet 201. The load resistor R4 connected between the secondary coils of the zero-phase voltage transformer ZPD is connected to the second coil. An example of the resistance values of the burden resistors R1 to R4 is R1 = R2 = 5Ω, R3 = 100Ω, and R4 = 630Ω.

  In the present embodiment, among the components housed in the case 101 of the switch 1, the zero-phase current transformer ZCT, the zero-phase voltage transformer ZPD, the current transformers CTu and CTw, the first and second The power transformers TR1 and TR2 and the operation circuit composed of the contacts 42a and 42b, the closing coil 42C and the holding coil 42H are used as inspection objects, and these inspection objects are changed over to the measuring terminals 211, Inspection is performed by connecting between 212.

  When the current transformer CTw is an inspection object, the movable contact of the changeover switch elements 220A and 220B is brought into contact with the second fixed contact, and the output terminal of the current transformer CTw is connected between the measurement terminals of the tester 210. Then, using the tester measurement mode as the voltage measurement mode, the output voltage of the current transformer CTw (voltage across the load resistor R1) is measured. When the current transformer CTu is an inspection object, the movable contact of the changeover switch elements 220A and 220B is brought into contact with the third fixed contact, and the output terminal of the current transformer CTu is connected between the measurement terminals of the tester 210. Connected, and the tester measurement mode is set to the voltage measurement mode, and the output voltage of the current transformer CTu (voltage across the load resistor R2) is measured.

  When the zero-phase current transformer ZCT is an inspection object, the movable contact of the changeover switch elements 220A and 220B is brought into contact with the fourth fixed contact, and the output terminal of the zero-phase current transformer is the measurement terminal of the tester 210. The output voltage of the zero-phase current transformer (the voltage at both ends of the load resistor R3) is measured with the measurement mode of the tester as the voltage measurement mode.

  When the zero phase voltage transformer ZPD is an inspection object, the movable contact of the changeover switch elements 220A and 220B is brought into contact with the fixed contact No. 5, and the output terminal of the zero phase voltage transformer is connected between the measurement terminals of the tester. And measuring the output voltage of the zero-phase voltage transformer (the voltage across the load resistor R4) with the tester measurement mode as the voltage measurement mode.

  When the distribution line is in a power failure state, when inspecting the current transformers CTu, CTw, the zero-phase current transformer ZCT, and the zero-phase voltage transformer ZPD, the tester measurement mode is set as the resistance measurement mode. The winding resistance can also be measured as a combined resistance with each burden resistance.

  When the operation circuit is inspected, the movable contact of the changeover switch elements 220A and 220B is brought into contact with the sixth fixed contact at the time of a power failure of the distribution line, and the parallel circuit of the holding coil 42H and the contact 42b and the closing coil 42C are connected. A series circuit is connected between the measurement terminals of the tester, and the state of the contact 42b, the closing coil 42C and the holding coil 42H is checked by measuring the resistance value with the contact 42b closed and opened. Further, the state of the contact 42a is checked by measuring the resistance value in a state where the movable contact of the changeover switch elements 220A and 220B is brought into contact with the 7th fixed contact and the contact 42a is connected between the measurement terminals of the tester. Even when a voltage is applied to the distribution line, the state of the contact 42a can be checked by measuring the voltage across the contact 42a, and the voltage across the closing coil 42C and the holding coil 42H can be measured. Thus, the state of these coils can be checked. Note that the contacts 42a and 42b can be forcibly turned on and off by operating the manual operation handle 106 provided in the switch if the distribution line is in a power failure state.

  When inspecting the first power supply transformer TR1, the movable contact of the changeover switch elements 220A and 220B is brought into contact with the fixed contact No. 8, and the secondary winding of the transformer TR1 is connected between the measurement terminals of the tester, The tester measurement mode is set to the voltage measurement mode, and the output voltage of the transformer TR1 is checked. When inspecting the second power transformer TR2, the movable contact of the changeover switch elements 220A and 220B is brought into contact with the fixed contact No. 9, and the secondary winding of the transformer TR2 is connected between the measurement terminals of the tester, The tester measurement mode is set to the voltage measurement mode, and the output voltage of the transformer TR2 is checked.

  When inspecting a switch that does not have a built-in power transformer, the switch-side measurement metal outlet 301 and the switch-side operation metal outlet 112 ′ attached to the switch case are respectively connected to the inspection device 2. Are connected to the inspection-side measurement metal outlet 201 and the inspection-side operation metal outlet 202B through the inspection cables 3 and 4 'to perform inspections other than the check of the power transformer.

  As described above, as the inspection-side operation metal outlet 202, it is preferable to provide the first and second inspection-side operation metal outlets 202A and 202B. The present invention is not limited to the case where both the first and second inspection-side operation metal outlets 202A and 202B are provided, and the first inspection-side operation metal outlet 202A or the second inspection-side operation metal outlet 202B. Only one of them may be provided.

  In the above embodiment, the inspection-side metal outlet is directly supported by the frame 230, but the inspection-side metal outlet is supported by the frame 230 via a cable (inspected at the end of the cable drawn from the circuit in the frame 230). A side metal outlet may be attached).

  In the above embodiment, a rotary operation type switch is used as the changeover switch. However, a pushbutton type changeover switch having a pushbutton corresponding to each inspection object may be used.

1 Switch for distribution line 2 Inspection device 3 Inspection cable (Inspection side measurement cable)
4 Inspection cable (Inspection side operation cable)
101 Switch case 111 Switch-side measurement metal outlet (switch-side metal outlet)
112 Metal outlet for switch side operation (metal outlet for switch side)
201 Inspection-side metal outlet (inspection-side metal outlet)
202 Metal outlet for inspection side operation (metal outlet for inspection side)
202A First metal outlet for inspection operation (metal outlet for inspection side)
202B Second operation side metal outlet (inspection side metal outlet)
210 Tester 211 One measurement terminal of the tester 212 Other measurement terminal of the tester 220 Changeover switch 220A First changeover switch element 220B Second changeover switch element 230 Frame of the inspection apparatus

Claims (6)

A plurality of components including an electromagnetic switch inserted in series with respect to the distribution line and at least one sensor for measuring the voltage or current of the distribution line are accommodated in the case, and the component in the case and the switch element A switch-side metal outlet having a terminal group including terminals connected to both ends of each of the plurality of components is provided to connect a cable connecting between the station and the station. An inspection device for a distribution line switch that performs inspection through the switch-side metal outlet from the outside of the case as an inspection object for the plurality of components of the switch for electric wire,
An inspection-side metal outlet having a terminal group consisting of terminals corresponding to each terminal of the switch-side metal outlet and connected to the switch-side metal outlet through an inspection cable in a state where the switch slave station is removed. When,
A tester having a pair of measurement terminals and capable of switching the measurement mode to at least a voltage measurement mode and a resistance value measurement mode;
Provided between a pair of measurement terminals of the tester and a terminal group of the inspection-side metal outlet, and the pair of measurement terminals of the tester includes the inspection-side metal outlet, the inspection cable, and the switch-side metal outlet; A switching switch for switching the connection between the pair of measurement terminals and the terminal group of the inspection side metal outlet so as to switch and connect to both ends of each of the plurality of inspection objects through,
A common frame that supports the inspection side metal outlet, the tester, and the changeover switch;
Comprising
The changeover switch is provided between the tester and a terminal group of the inspection side metal outlet, and passes through one of the measurement terminals of the tester through the inspection cable and the switch side metal outlet . a first changeover switch element for each switching connected to a plurality of terminals of the testing side Metall outlet will be connected to one end, is provided between the terminal groups of the tester and the test-side metal outlet The other measurement terminal of the tester is connected to the plurality of terminals of the inspection side metal outlet to be connected to the other end of each of the plurality of inspection objects through the inspection cable and the switch side metal outlet. Comprising a second changeover switch element to be connected,
The first changeover switch element and the second changeover switch element are provided so as to operate in conjunction with each other, and the pair of measurement terminals of the tester are connected to the inspection side metal outlet and the inspection when in the same switching position . It is configured to be electrically connected to one end and the other end of the same inspection object through the cable and the switch side metal outlet ,
Inspection device for distribution line switch. The switch includes a zero-phase current transformer, a zero-phase voltage transformer, and an overcurrent detection current transformer as the sensors, and the zero-phase current transformer, zero-phase voltage transformer, and overcurrent detection transformer. the burden resistor connected between the pair of measuring terminals flow device a in the respective inspection Target material is provided between the terminal groups of the test-side metal outlet and said changeover switch,
The inspection device for a switch for a distribution line according to claim 1 . In the vicinity of the operation unit for operating the switching of the changeover switch, the changeover switch is the item displayed is provided indicating the type of the test object to be connected is that the measuring terminals of the tester when in the respective switching position location The inspection device for a distribution line switch according to claim 1 or 2, characterized in that The inspection device for a distribution line switch according to claim 1 , wherein the tester is detachably attached to the frame . The test-side metal outlet, switch to the object of inspection, and switch-side measuring metal outlet having a terminal group to give the slave stations take the output of the sensor, the operating circuit of the electromagnetic switch two Metall outlet with switch-side operation for metal outlet with a lead terminal in case that provided as the switch-side metal outlet, the test-side measuring metal corresponding to the switch-side measuring metal outlet The distribution line switch according to any one of claims 1 to 4 , further comprising: an outlet and an inspection-side operation metal outlet corresponding to the switch-side operation metal outlet as the inspection-side metal outlet . Inspection device. As the inspection-side operation for metal outlet, the switch takes the case with is switch-side operation when the power transformer to incorporate two phases of the voltage of the distribution line in the switch case to be inspected is incorporated the first and the test-side operation for metal outlets corresponding to use metal outlet, of the switch when the power supply transformer for taking a voltage between two phases of the distribution line in the switch case to be inspected is not built distribution according to claim 5, characterized in that the two test-side operations for metal outlet and the second test-side operations for metal outlet corresponding to switch-side operation Metaruko outlet attached to the case is provided Inspection device for electric wire switch.

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