Switch for breaker test, lead wire connection jig, breaker test system, and breaker test method

Abstract

To provide a circuit breaker test changeover switch, a lead wire connection tool, a circuit breaker test system, and a circuit breaker test method that enables stable circuit breaker testing using a grounding device connected to a main circuit.SOLUTION: A changeover switch 10 includes grounding device connecting means 13 connected to a main circuit and to which a grounding device for grounding the main circuit can be detachably connected, tester connecting means 14 connected to the grounding device connecting means 13 via a lead wire 16 and to which a main circuit lead wire 4a connected to a circuit breaker tester can be detachably connected, a switch body 12 whose primary side terminal is connected to the grounding device connecting means 13 via a lead wire 17 and can be switched between an on state and an open state, and a grounding terminal 15 connected to the secondary side terminal of the switch body 12 via a lead wire 18 and to which a grounding lead wire 3 is detachably connected.SELECTED DRAWING: Figure 3

Description

Technical Field

[0001] The present invention relates to a switching switch for circuit breaker testing, a lead wire connection jig, a circuit breaker test system, and a circuit breaker test method.

Background Art

[0002] In a substation or the like, a circuit breaker (CB: Circuit Breaker) is installed to interrupt the current flowing in the main circuit, and circuit breaker tests (CB tests) such as opening and closing characteristic tests are performed on this circuit breaker. In the CB test, it is necessary to connect a CB tester to a pair of main circuits respectively supported by the bushings of the circuit breaker. For example, an operator climbs on the circuit breaker to connect a lead wire to the main circuit. Such high-altitude work places a burden on the operator, and there is a desire to perform a CB test without performing high-altitude work. For example, Patent Document 1 discloses a method of electrically connecting a main circuit and a CB tester using an earthing hook provided with a hook for hooking on the main circuit at the tip.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] In the method of Patent Document 1, a current transformer in which a winding is wound around an annular core having a gap is arranged so that the grounding lead wire of the grounding device passes through it, and a test current is generated in the grounding lead wire by applying a voltage to this winding. Therefore, a test current cannot be directly supplied to the grounding lead wire of the grounding device, and it is difficult to control the characteristics of the test current supplied to the grounding lead wire. In addition, it is also necessary to hold the current transformer so that it does not shift with respect to the grounding lead wire. For this reason, there is a problem that it is difficult to stably perform the CB test.

[0005] The present invention has been made based on such a background, and an object thereof is to provide a changeover switch for circuit breaker testing, a lead wire connection jig, a circuit breaker testing system, and a circuit breaker testing method that can stably perform a circuit breaker test using a grounding device connected to a main circuit.

Means for Solving the Problems

[0006] In order to achieve the above object, the changeover switch for circuit breaker testing according to the present invention includes: A circuit breaker test changeover switch for switching between a closed state in which the main circuit is grounded and an open state in which the main circuit and the circuit breaker tester are electrically connected, said a grounding device connection means connected to the main circuit and to which a grounding device for grounding the main circuit can be detachably connected; a tester connection means connected to the grounding device connection means via a lead wire and to which a lead wire connected to a circuit breaker tester can be detachably connected; said a switch body having a primary side terminal connected to the grounding device connection means via a lead wire and being in an on state and an off state; said and said a grounding terminal connected to a secondary side terminal of the switch body via a lead wire and to which a grounding lead wire can be detachably connected. to switch It is provided with.

Effects of the Invention

[0007] According to the present invention, it is possible to provide a changeover switch for circuit breaker testing, a lead wire connection jig, a circuit breaker testing system, and a circuit breaker testing method that can stably perform a circuit breaker test using a grounding device connected to a main circuit.

Brief Description of the Drawings

[0008]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Figure 7

Figure 8

Figure 9

Embodiments for Carrying Out the Invention

[0009] Hereinafter, a changeover switch for circuit breaker testing, a lead wire connection jig, a circuit breaker test system, and a circuit breaker test method according to embodiments of the present invention will be described in detail with reference to the drawings. In each drawing, the same or equivalent parts are denoted by the same reference numerals.

[0010] (Embodiment 1) A changeover switch for circuit breaker testing, a circuit breaker test system, and a circuit breaker test method according to Embodiment 1 will be described. In Embodiment 1, a case where grounding devices for grounding the main circuits are respectively attached to the main circuits supported by the bushings of the circuit breaker before the inspection work of the circuit breaker will be described as an example. In the inspection work of the circuit breaker, since it is necessary to perform work on the main circuit to configure the circuit for the CB test, it is necessary to ground the main circuit connected to the circuit breaker as a safety measure in advance.

[0011] The circuit breaker test system according to Embodiment 1 is a system that performs a CB test using a CB tester connected to each of a pair of main circuits supported by the bushings of the circuit breaker. The CB test is a test for checking whether the time required for the circuit breaker to trip and close satisfies the reference value set for each circuit breaker. Separate circuit breakers are electrically connected to the circuit breaker via their respective main circuits, and the CB test is performed by tripping the main circuit current using the circuit breaker and then opening each circuit breaker to divide the circuit between the circuit breakers into a power outage area.

[0012] As shown in FIG. 1, the circuit breaker test system 1 includes a pair of grounding devices 2 attached to a pair of main circuits supported by the bushings of the circuit breaker and grounded respectively, a switching switch 10 connected to the primary grounding device 2 and switching between an energized state in which the main circuit is grounded by the primary grounding device 2 and an open state in which the CB tester 4 and the main circuit are electrically connected to each other, a grounding lead wire 3 connected to the switching switch 10, and a CB tester 4 connected to the switching switch 10 and the secondary grounding device 2 for performing an operation test of the circuit breaker.

[0013] The switching switch 10 and the CB tester 4 are connected via a main circuit lead wire 4a, and the CB tester 4 is connected to a ground wire via a main circuit lead wire 4b. The ground wire is, for example, a ground wire connected to an underground ground grid or a grounding electrode. The main circuit lead wire 4b connected to the CB tester 4 and the lead wire 2c of the grounding device 2 are grounded separately, and the main circuit lead wire 4b and the lead wire 2c are electrically connected to each other via the ground wire. Since the main circuit lead wire 4b and the lead wire 2c are not directly connected, the circuit configuration can be simplified.

[0014] In FIG. 1, each grounding device 2 and each main circuit lead wire 4a, 4b connected to the main circuit supported by the bushings of the circuit breaker are shown with one omitted for each, but since the main circuit is a three-phase circuit through which three-phase alternating current flows, actually three are provided for each.

[0015] The grounding device 2, also called a discharge rod or an earth hook, is a device that is connected to the main circuit by an operator and grounds the main circuit via a lead wire. The grounding device 2 is connected to the main circuit in advance before the inspection of the circuit breaker to reliably discharge the residual charge in the main circuit after a power outage and to protect the operator from high voltage even if high voltage is accidentally applied to the main circuit. Since the grounding device 2 has high safety performance and is heavy, its installation and removal are burdensome for the operator.

[0016] The grounding device 2 includes a rod-shaped member 2a that can be grasped by an operator, a conductive hook 2b provided at the tip of the rod-shaped member 2a and configured to be hooked onto the main circuit, and a lead wire 2c that is electrically connected to the conductive hook 2b and grounds the main circuit via means such as a grounding wire installed on the ground. The rod-shaped member 2a is formed of an insulating material so that the operator does not get an electric shock, and the conductive hook 2b and the lead wire 2c are formed so as not to melt due to heat even when a large current flows. The conductive hook 2b is formed so that it can be tightened with a screw, for example, to prevent it from falling off the main circuit.

[0017] Since bare wires are used in the main circuit of the substation, the operator can hold the rod-shaped member 2a and hook the conductive hook 2b onto the main circuit to obtain an electrical connection between the main circuit and the lead wire 2c, and ground the main circuit via the lead wire 2c.

[0018] The grounding device 2 on the secondary side grounds the main circuit on the secondary side of the circuit breaker and is always used as the common side. On the other hand, when the switch body of the changeover switch 10 is turned on, the grounding device 2 on the primary side grounds the main circuit on the primary side of the circuit breaker. Also, when the switch body of the changeover switch 10 is opened, the grounding device 2 on the primary side electrically connects the main circuit on the primary side and the CB tester 4. At this time, a test circuit is formed among a pair of main circuits, the circuit breaker, and the CB tester 4.

[0019] As shown in FIG. 2, the changeover switch 10 includes a housing 11, a switch body 12 attached to the housing 11, a grounding appliance connecting means 13 attached to the housing 11 and electrically connected to the primary side terminal of the switch body 12 and capable of detachably connecting the lead wire 2c of the grounding appliance 2 connected to the main circuit, a tester connecting means 14 attached to the housing 11 and electrically connected to the grounding appliance connecting means 13 and capable of detachably connecting the main circuit lead wire 4a connected to the CB tester 4, and a grounding terminal 15 attached to the housing 11 and electrically connected to the secondary side terminal of the switch body 12 to which the grounding lead wire 3 is detachably connected. The grounding appliance connecting means 13 and the tester connecting means 14 are electrically connected to each other via a lead wire 16, and the switch body 12, the grounding appliance connecting means 13, and the grounding terminal 15 are electrically connected to each other via lead wires 17 and 18, respectively.

[0020] The housing 11 is configured such that, for example, two box-shaped cases 11a and 11b are connected by a hinge 11c and are arranged side by side in an open state. Inside the housing 11, each component constituting the changeover switch 10 is attached. Specifically, the switch body 12 is attached to one case 11a, and other components are attached to the other case 11b. When the housing 11 is open, each component constituting the changeover switch 10 is exposed to the outside, and when the housing 11 is closed, each component constituting the changeover switch 10 is housed inside.

[0021] The switch body 12 is a device that switches off and grounds a three-phase circuit at once. The switch body 12 is, for example, a knife switch with a cover (3-pole knife switch). The knife switch includes a knife-shaped blade and a blade receiver that receives the knife-shaped blade. The switch body 12 is manually operable and includes a lever 12a for switching off and grounding. Markings may be provided on the front and back surfaces of the lever 12a so that an operator can determine whether it is in the "grounding" or "testing" state when the lever 12a is tilted to each side.

[0022] The grounding appliance connection means 13 includes three terminals 13a, 13b, and 13c for detachably connecting the three lead wires 2c of each grounding appliance 2. Each of the terminals 13a, 13b, and 13c is an L-shaped metal member arranged at positions separated from each other. The tightening fittings provided at the ends of the respective lead wires 2c are tightened on each of the terminals 13a, 13b, and 13c, thereby achieving a detachable connection.

[0023] The tester connection means 14 is, for example, a terminal block in which a plurality of terminals are combined with insulating parts. The tester connection means 14 includes three terminals 14a, 14b, and 14c for detachably connecting the three main circuit lead wires 4a connected to the CB tester 4 respectively. Connectors are provided on each of the three terminals 14a, 14b, and 14c, and each connector is connected to the connector provided on each of the main circuit lead wires 4a.

[0024] The grounding terminal 15 is a terminal to which the grounding lead wire 3 is detachably connected, and the switch body 12 is grounded through the grounding lead wire 3. The tightening fitting provided at the end of the grounding lead wire 3 is tightened on the grounding terminal 15, thereby achieving a detachable connection.

[0025] Hereinafter, with reference to FIG. 3, the circuit arrangement of the changeover switch 10 according to Embodiment 1 will be described. The solid lines in FIG. 3 represent lead wires, and the graphic ● represents terminals. Each of the terminals 13a, 13b, and 13c of the grounding appliance connection means 13 is connected to each of the terminals 14a, 14b, and 14c of the tester connection means 14 via separate lead wires 16. The three terminals 13a, 13b, and 13c are respectively connected to the three primary-side main circuits via the respective lead wires 2c, and the three terminals 14a, 14b, and 14c are respectively connected to the three terminals of the CB tester 4 via the respective main circuit lead wires 4a. Each of the terminals 13a, 13b, and 13c of the grounding appliance connection means 13 and each of the terminals 14a, 14b, and 14c of the tester connection means 14 constitute the primary-side terminals of the changeover switch 10.

[0026] Further, each of the terminals 13a, 13b, and 13c of the grounding appliance connection means 13 is connected to each of the terminals provided on the primary side of the switch body 12 via separate lead wires 17. Each of the terminals provided on the secondary side of the switch body 12 is connected to one grounding terminal 15 via a separate lead wire 18. The grounding terminal 15 is connected to a grounding wire installed on the ground via a grounding lead wire 3 and constitutes the secondary side terminal of the changeover switch 10. Since the changeover switch 10 has the above circuit arrangement, when the switch body 12 is turned on, all three phases of the main circuit are grounded, and when the switch body 12 is opened, all the groundings of the three phases of the main circuit are removed, and all three phases of the main circuit are connected to the CB tester 4.

[0027] Returning to FIG. 1, the CB tester 4 outputs a control signal to the circuit breaker in a state where a test current is supplied to the primary side of the circuit breaker and measures the on / off of a weak current on the secondary side of the circuit breaker. The CB tester 4 is connected to the control unit of the circuit breaker via a lead wire for control signal (not shown) and transmits a control signal for controlling the operation of the circuit breaker to the control unit of the circuit breaker. The above is the configuration of the circuit breaker test system 1.

[0028] Next, referring to FIG. 4, the flow of the circuit breaker test method performed by an operator using the circuit breaker test system 1 according to Embodiment 1 will be described. Hereinafter, it is assumed that power transmission in the main circuit has been stopped in advance.

[0029] First, the primary side terminal and the secondary side terminal of the changeover switch 10 are connected to the primary side grounding appliance 2 and the grounding lead wire 3, respectively, to ground the changeover switch 10 (step S1). Specifically, first, the lead wire 2c of the primary side grounding appliance 2 is connected to the grounding appliance connection means 13 of the changeover switch 10. At this time, the lever 12a of the switch body 12 provided on the changeover switch 10 is tilted to the on position. Next, the grounding lead wire 3 is connected to the grounding terminal 15 and the grounding lead wire 3 is connected to a grounding wire installed on the ground, thereby grounding the changeover switch 10.

[0030] Next, attach the grounding device 2 to each of the primary and secondary main circuits (step S2). At this time, the lead wire 2c of the grounding device 2 on the secondary side is connected to the ground wire in advance before being connected to the secondary main circuit.

[0031] Next, connect the input terminal and output terminal of the CB tester 4 to the ground wire and the changeover switch 10 respectively (step S3). Specifically, first, connect the input terminal of the CB tester 4 to the ground wire via the main-circuit lead wire 4b. Next, connect the output terminal of the CB tester 4 to the tester connection means 14 of the changeover switch 10 via the main-circuit lead wire 4a.

[0032] Next, by tilting the lever 12a of the switch body 12 to the open side, disconnect the primary main circuit and the CB tester 4 from the ground (step S4), and perform a CB test using the CB tester 4 (step S5).

[0033] After the completion of the CB test, by returning the lever 12a of the switch body 12 to the on side, ground the primary main circuit and the CB tester 4 (step S6), and remove the CB tester 4 from the changeover switch 10 (step S7). The above is the flow of the circuit breaker test method.

[0034] As described above, the changeover switch 10 according to Embodiment 1 is connected to the main circuit, and includes a grounding device connection means 13 to which the grounding device 2 for grounding the main circuit can be detachably connected, a tester connection means 14 to which the main-circuit lead wire 4a connected to the CB tester 4 via the lead wire 16 can be detachably connected, a switch body 12 whose primary-side terminal is connected to the grounding device connection means 13 via the lead wire 17 and whose on state and open state can be switched, and a grounding terminal 15 connected to the secondary-side terminal of the switch body 12 via the lead wire 18 and to which the grounding lead wire 3 can be detachably connected. Thereby, a closed test circuit can be configured using the grounding device 2, and thus the CB test can be easily and stably performed using the grounding device 2 connected to the main circuit.

[0035] (Embodiment 2) Next, a switching switch for circuit breaker testing, a lead wire connection jig, a circuit breaker test system, and a circuit breaker test method according to Embodiment 2 will be described. In Embodiment 1, each grounding device 2 was attached to each main circuit supported by the bushing of the circuit breaker during the inspection work. In contrast, in Embodiment 2, a case where the grounding device 2 is attached to the primary-side main circuit of the circuit breaker and not attached to the secondary-side main circuit during the inspection work will be described as an example. Hereinafter, the description will focus on the differences between the two.

[0036] As shown in FIG. 5, in the circuit breaker test system 1 according to Embodiment 2, after the inspection of the circuit breaker starts and before the CB test is performed, the lead wire connection jig 20 is connected to the secondary-side main circuit of the circuit breaker. The lead wire connection jig 20 is electrically connected to the wire in a state of being hooked on the wire without insulation coating, and is a jig for connecting the wire to other equipment, such as a ground wire or a switching switch 10, via a lead wire. Since the lead wire connection jig 20 does not assume that a high voltage is applied like the grounding device 2, high insulation performance and the like are not required, and each part can be configured with lightweight parts. As a result, the burden on the operator during attachment and detachment is reduced. Hereinafter, the configuration of the lead wire connection jig 20 will be described.

[0037] As shown in FIG. 6, the lead wire connection jig 20 includes a rod-shaped member 21 that can be gripped by an operator, a cap member 22 supported at the tip of the rod-shaped member 21, and a gripping means 23 that is supported so as to be swingable with respect to the cap member 22 and grips the main circuit from both sides by elastic force in a state of being hooked on the main circuit and is electrically conductive so as to be electrically connected to the main circuit, and a lead wire 24 electrically connected to the gripping means 23.

[0038] The rod-shaped member 21 includes a shaft 21a and a handle 21b provided on the base end side of the shaft 21a that can be gripped by an operator. The shaft 21a and the handle 21b are integrally formed, for example. The shaft 21a is stretchable in the longitudinal direction, for example.

[0039] As shown in FIG. 7, the cap member 22 is formed in a cylindrical shape and includes a base end member 22a that is attached to the tip end side of the shaft 21a, and a tip end member 22b that extends from the base end member 22a toward the tip end side and is formed in a plate shape. The base end member 22a and the tip end member 22b are integrally formed, for example. The cap member 22 may be a part integrally formed of plastic. The rod-shaped member 21 and the cap member 22 may be commercially available products used as they are.

[0040] The gripping means 23 is formed of a conductive material, for example, a metal material. The gripping means 23 includes a plate-shaped member 23a rotatably supported by the tip end member 22b, and a curved member 23b supported by the plate-shaped member 23a and sandwiching the main circuit together with the plate-shaped member 23a by an elastic force.

[0041] The plate-shaped member 23a is in contact with the tip end member 22b and is arranged to extend in a direction parallel to each other. A bolt 22c is inserted through a through-hole of the plate-shaped member 23a and an insertion hole of the tip end member 22b, and a nut 22d is tightened from the tip end side of the bolt 22c. The plate-shaped member 23a is rotatably supported around the longitudinal axis L of the bolt 22c. When the nut 22d is tightened with respect to the bolt 22c, the tip end member 22b and the plate-shaped member 23a are pressed against each other, and the inclination of the gripping means 23 with respect to the cap member 22 can be maintained.

[0042] The bolt 22c is inserted through a through-hole of a round terminal 24a to which a lead wire 24 is connected. The plate-shaped member 23a and the bolt 22c are electrically connected to each other, and the bolt 22c and the round terminal 24a of the lead wire 24 are electrically connected to each other. Thereby, the main circuit and the lead wire 24 are electrically connected via the plate-shaped member 23a, the bolt 22c, and the round terminal 24a.

[0043] The bent member 23b is separated from the plate-like member 23a on the free end side, contacts the plate-like member 23a at the intermediate portion, and is bent so as to accommodate the main circuit in the space formed between the intermediate portion and the connection end. When the main circuit guided on the inner surface of the bent member 23b crosses the intermediate portion and moves to the proximal end side, the main circuit is sandwiched between the plate-like member 23a and the bent member 23b while being pressed from both sides. The free end of the bent member 23b is preferably arranged on the proximal end side of the lead wire connecting jig 20 rather than the proximal end of the plate-like member 23a so as to easily catch the main circuit.

[0044] The plate-like member 23a and the bent member 23b are in contact with each other via the hinge 23c on the distal end side of the gripping means 23. Through holes are formed in the plate-like member 23a and the bent member 23b, respectively, and through holes are also formed on both sides of the hinge 23c. A bolt 23d is inserted through the through hole of the plate-like member 23a and one through hole of the hinge 23c, and another bolt 23d is inserted through the through hole of the bent member 23b and the other through hole of the hinge 23c, and they are tightened with nuts 23e, respectively.

[0045] The plate-like member 23a and the bent member 23b are urged toward each other by a coil spring 23f provided on the distal end side of the gripping means 23 and on the proximal end side of the hinge 23c. The coil spring 23f is an example of biasing means for biasing the plate-like member 23a and the bent member 23b toward each other. The coil spring 23f is supported by the plate-like member 23a and the bent member 23b and is guided by a bolt 23g extending in a direction intersecting the plate-like member 23a.

[0046] Specifically, through-holes through which bolts 23g are inserted are formed in the plate-shaped member 23a and the curved member 23b, respectively. The head of the bolt 23g contacts the outer surface of the curved member 23b, and the coil spring 23f contacts the outer surface of the plate-shaped member 23a. When the nut 23h attached to the shaft portion of the bolt 23g is tightened, the coil spring 23f is compressed, and the plate-shaped member 23a and the curved member 23b can be biased in a direction approaching each other. Thereby, the state where the intermediate portions of the plate-shaped member 23a and the curved member 23b are in contact with each other can be maintained, and the main circuit that has overcome the intermediate portion of the curved member 23b can be stably gripped by the plate-shaped member 23a and the curved member 23b.

[0047] Since the lead wire connection jig 20 has the above configuration, it can hold the gripping means 23 in a tilted state with respect to the rod-shaped member 21, and can also connect to the main circuit even when the main circuit stands up in the vertical direction. Further, since the gripping means 23 presses from both sides in a state of sandwiching the main circuit, the influence on the test result of the CB test can be suppressed even if operating vibration occurs in the circuit breaker. The above is the configuration of the lead wire connection jig 20.

[0048] Next, with reference to FIG. 8, the flow of the circuit breaker test method performed by an operator using the lead wire connection jig 20 according to Embodiment 2 will be described. Hereinafter, it is assumed that power transmission in the main circuit has been stopped in advance.

[0049] First, the steps of steps S1 and S2 are executed, and then the lead wire connection jig 20 is connected to the main circuit on the secondary side (step S2A). Specifically, with the lead wire 24 connected to the ground wire, the operator grips the handle 21b, lifts the lead wire connection jig 20, and hooks the gripping means 23 on the main circuit.

[0050] Next, the steps of steps S3 to S6 are performed. Thereafter, the CB tester 4 is removed from the ground wire and the changeover switch 10 (step S7), and the lead wire connection jig 20 is removed from the main circuit on the secondary side (step S8). The above is the flow of the circuit breaker test method.

[0051] As described above, the lead wire connection jig 20 according to the second embodiment includes a rod-shaped member 21 that can be gripped by a user, a gripping means 23 that is provided at the tip of the rod-shaped member 21, is supported so as to be swingable with respect to the rod-shaped member 21, and can grip the main circuit from both sides by an elastic force and has conductivity, and a lead wire 24 electrically connected to the gripping means 23. Therefore, the connection work to the main circuit of the CB tester 4 can be performed regardless of the direction in which the main circuit extends, and the electrical connection between the CB tester 4 and the main circuit can be stabilized, so that the CB test can be stably performed.

[0052] The present invention is not limited to the above-described embodiment, and the following modifications are possible.

[0053] (Modification example) In the above embodiment, the grounding device 2 is used to ground the main circuit, and the lead wire 2c of the grounding device 2 is connected to the changeover switch 10, but the present invention is not limited to this. For example, a grounding device with clips attached to both ends of the lead wire may be used. An operator performs high-altitude work to connect one clip to the main circuit and the other clip to the changeover switch 10, thereby connecting the main circuit and the changeover switch 10 via the lead wire.

[0054] In the above embodiment, the changeover switch 10 is connected to the grounding device 2 on the primary side of the circuit breaker, but the present invention is not limited to this. For example, the changeover switch 10 may be connected to the grounding device 2 on the secondary side of the circuit breaker.

[0055] In the above embodiment, the CB tester 4 is configured in a circuit by connecting it to the ground wire via the main circuit lead wire 4b, but the present invention is not limited to this. For example, the CB tester 4 may be configured in a circuit by connecting it to the lead wire 2c of the grounding device 2 on the secondary side grounded via the ground wire, or may be connected to the lead wire 24 of the lead wire connection jig 20 grounded via the ground wire.

[0056] In the above-described embodiment, each part of the changeover switch 10 was attached to the housing 11, but the present invention is not limited to this. For example, the housing 11 may be omitted, or a plate member may be used instead of the housing 11.

[0057] In the above-described embodiment, the rod-shaped member 21 included the shaft 21a and the handle 21b, but the present invention is not limited to this. For example, the handle 21b may be omitted from the rod-shaped member 21, and an operator may grip the shaft 21a.

[0058] In the above-described second embodiment, the cap member 22 was provided at the tip of the rod-shaped member 21 of the lead wire connection jig 20, but the present invention is not limited to this. For example, the cap member 22 may be omitted, and the gripping means 23 may be rotatably supported directly at the tip of the rod-shaped member 21.

[0059] In the above-described second embodiment, the plate-shaped member 23a and the curved member 23b were connected via the hinge 23c, but the present invention is not limited to this. For example, the plate-shaped member 23a and the curved member 23b may be directly connected, or the plate-shaped member 23a and the curved member 23b may be integrally formed in advance.

[0060] In the above-described second embodiment, the plate-shaped member 23a and the curved member 23b were urged toward each other by the coil spring 23f, but the present invention is not limited to this. When sufficient elastic force is obtained by the plate-shaped member 23a and the curved member 23b, the biasing means such as the coil spring 23f may be omitted.

[0061] In the above-described second embodiment, a circuit breaker is connected to the secondary side of the main circuit, and the secondary side of the circuit breaker is grounded, but the present invention is not limited to this. For example, as shown in FIG. 9, a transformer Tr (transformer) and a cubicle CUB (high-voltage power receiving equipment) may be connected in order to the secondary side of the circuit breaker. In this case, the grounding device 2 may be attached to the secondary side of the cubicle CUB for grounding, and the lead wire connection jig 20 may be connected to the main circuit on the secondary side of the circuit breaker. The CB tester 4 may be connected to the ground wire via the main circuit lead wire 4b, or may be connected to the lead wire connection jig 20.

[0062] In the above-described embodiment, the grounding device 2 was attached to the main circuit supported by the bushing of the circuit breaker. However, the present invention is not limited to this. Depending on the circuit configuration to be inspected, the grounding device 2 may be attached to the main circuit away from the circuit breaker. For example, in the inspection work of the circuit breaker involving the bus stop in a double-bus substation, when two circuit breakers A and B are connected in parallel to the main circuit on the primary side of the circuit breaker, the grounding device 2 may be attached near the circuit breakers A and B. The reason is that it is safer to attach the ground closer to the inflow point of the power supply.

[0063] In the above modification, the changeover switch 10 is connected to the grounding device 2 located at a position away from the circuit breaker, and the CB tester 4 is installed near the circuit breaker, and the changeover switch 10 and the CB tester 4 may be connected by a lead wire 4a for the main circuit having a certain length. This is because in the CB test, the operator needs to operate the CB tester 4 and confirm the operating status of the circuit breaker. Also, when the CB tester 4 is installed near the circuit breaker, there is no need to extend the lead wire for the control signal.

[0064] The above-described embodiment is an example, and the present invention is not limited thereto. Various embodiments are possible without departing from the gist of the invention described in the claims. The constituent elements described in the embodiments and modifications can be freely combined. Also, inventions equivalent to the invention described in the claims are included in the present invention.

Explanation of Reference Numerals

[0065] 1 Circuit breaker test system 2 Grounding device 4 CB tester 10 Changeover switch 11 Housing 12 Switch body 13 Grounding device connection means 14 Tester connection means 15 Grounding terminal 16, 17, 18 Lead wire 20 Lead wire connection jig 21 Rod-shaped member 23 Holding means 24 Lead wire

Claims

1. A circuit breaker test switch for switching between a closed state in which the main circuit is grounded and an open state in which the main circuit and the circuit breaker tester are electrically connected, comprising: Grounding device connection means connected to the main circuit and to which a grounding device for grounding the main circuit can be detachably connected; Tester connection means connected to the grounding device connection means via a lead wire and to which a lead wire connected to the circuit breaker tester can be detachably connected; A switch body having a primary side terminal connected to the grounding device connection means via a lead wire and for switching between the closed state and the open state; A grounding terminal connected to the secondary side terminal of the switch body via a lead wire and to which a grounding lead wire is detachably connected. A circuit breaker test switch comprising the above.

2. The circuit breaker test switch according to claim 1, further comprising a housing to which the grounding device connection means, the tester connection means, the switch body, and the grounding terminal are attached, and which can be opened and closed such that in an open state, the grounding device connection means, the tester connection means, the switch body, and the grounding terminal are exposed to the outside, and in a closed state, they are housed inside. The circuit breaker test switch according to claim 1.

3. The circuit breaker test switch according to claim 1, wherein both the grounding device connection means and the tester connection means each comprise a plurality of terminals to which separate lead wires can be detachably connected. The circuit breaker test switch according to claim 1.

4. A rod-shaped member that can be gripped by a user; Gripping means provided at the tip of the rod-shaped member, supported so as to be swingable with respect to the rod-shaped member, and capable of gripping the main circuit from both sides by elastic force and having conductivity; A lead wire electrically connected to the gripping means. The gripping means comprises a plate-shaped member rotatably supported with respect to the rod-shaped member at the tip of the rod-shaped member, and a curved member connected to the plate-shaped member on the tip side of the gripping means, and sandwiches the main circuit by the elastic force obtained by the plate-shaped member and the curved member. A lead wire connection jig.

5. The plate-shaped member is supported by the rod-shaped member so as to be rotatable around a rotation axis extending in a direction perpendicular to the plate-shaped member. The lead wire connection jig according to claim 4.

6. The curved member is separated from the plate-shaped member at the free end side, contacts the plate-shaped member at the intermediate portion, is located at the intermediate portion and the tip side of the gripping means, and is curved so as to accommodate the main circuit in a space formed between the intermediate portion and a connection end connected to the plate-shaped member. The lead wire connection jig according to claim 5.

7. A bolt is inserted through the through-hole of the plate-like member and the through-hole of the rod-like member, and the plate-like member is rotatably supported around the axis of the bolt. By tightening a nut from the tip side of the bolt, the inclination of the plate-like member with respect to the rod-like member can be held. The lead wire connection jig according to claim 5.

8. The switching switch for circuit breaker test according to any one of claims 1 to 3, An earthing appliance connected to the earthing appliance connection means of the switching switch for circuit breaker test and the primary side of the main circuit, A circuit breaker tester connected to the tester connection means of the switching switch for circuit breaker test, An earthing lead wire connected to the secondary side terminal of the switch body provided on the switching switch for circuit breaker test, A lead wire connection jig having a gripping means connected to the secondary side of the main circuit, and grounding the secondary side of the main circuit through the gripping means and the lead wire of the lead wire connection jig electrically connected to the gripping means. The lead wire connection jig according to any one of claims 4 to 7, A circuit breaker test system comprising:

9. An earthing appliance connected to the main circuit connected to the circuit breaker, A circuit breaker tester that performs a circuit breaker test while being connected to the circuit breaker, A switching switch having a primary side terminal detachably connected to both the earthing appliance and the circuit breaker tester, a secondary side terminal configured to be capable of earthing, and capable of switching between an input state in which the main circuit is earthed and an open state in which the main circuit and the circuit breaker tester are electrically connected. A circuit breaker test system comprising:

10. A step of switching a switching switch having a primary side terminal to which both an earthing appliance connected to the main circuit connected to the circuit breaker and a circuit breaker tester for performing a circuit breaker test on the circuit breaker are detachably connected and a secondary side terminal capable of earthing the main circuit from an input state in which the main circuit is earthed to an open state in which the main circuit and the circuit breaker tester are electrically connected; A step of performing a circuit breaker test using the circuit breaker tester; A step of switching the switching switch from the open state to the input state; A circuit breaker test method including:

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