JP5208992B2 - Test plug - Google Patents

Description

  The present invention relates to a test plug that is installed on a panel surface of a switchboard and is inserted into a test terminal connected to each terminal of the protective relay in order to perform an operation test or the like of the protective relay that protects the power system. The present invention relates to a test plug capable of giving an operation instruction to a protective relay while confirming a live state.

The power system is provided with a protective relay (relay circuit) for protecting electrical equipment from short circuit accidents and ground faults. FIG. 17 is a circuit diagram showing a power system protection system.
FIG. 17 shows a three-phase three-wire AC power system, and a current transformer (CT) 302 (into each phase of a line 300 (300B, 300W, 300R) having a B phase, a W phase, and an R phase. 302B, 302W, 302R) are connected, and the protection relay 304 is driven by the current transformed by the current transformer (CT) 302. Note that one end of the current transformer 302 is a neutral point N. The protective relay 304 is set to operate using the abnormal current in the line 300 as a threshold value. When the current is abnormal, the protective relay 304 is operated by a current exceeding the threshold value, and the signal S of the contact is generated. The interruption control of the line 300 is performed.

Between the current transformer 302 and the protective relay 304, a test terminal 310 for performing an operation test of the protective relay 304 is arranged. The test terminal 310 includes a first conductor 312 (312B, 312W, 312R, 312N) electrically connected to the power supply side of the protective relay 304, and a second conductor 314 (314B, 314W, 314R, electrically connected to the load side of the line 300). 314N) and a test plug insertion port 316 for inserting the test plug 320, and each first conductor 312 is electrically connected to each second conductor 314 at all times.
The test plug 320 includes a first plug conductor 322 (322B, 322W, 322R, 322N) connected to each first conductor 312, and a second plug conductor 324 (324B, 324) connected to each second conductor 314. 324W, 324R, 324N), each first plug conductor 322, and a test terminal 326 drawn from each second plug conductor 324. When the test plug 320 is inserted into the test terminal 310, the contact between the first conductor 312 and the second conductor 314 is opened, the first conductor 312 and the first plug conductor 322 are connected, and the second conductor 314 and the second plug conductor 324 are connected. Therefore, by inserting the test plug 320 into the test terminal 310, the circuit between the current transformer 302 and the protective relay 304 can be disconnected and another circuit connected to the test plug 320 can be connected.

For example, in order to test the protective relay 304, a test device 330 is connected to the test terminal 326 to form a test circuit, and then whether or not the test circuit is correctly connected is confirmed by an ammeter or the like. When it is confirmed that the test circuit is correctly connected, the test plug 320 is inserted into the test terminal 310 to test whether the protective relay 304 operates normally using the test device 330. it can.
The power system protection system is provided not only for the current element but also for the voltage element. That is, the voltage protective relay incorporates a voltage element having a voltage lower than that of the line 300 by a transformer, and generates a signal so that the circuit breaker disconnects the line 300 when a voltage abnormality occurs. A test terminal is also arranged between the transformer and the protective relay for connecting the test apparatus.

The test terminals described above are divided into lines and current / voltage elements and arranged on the switchboard, and a name plate for indicating which test terminal is provided on the panel surface. The worker confirms the name plate and inserts the test plug, but there is a case where the test plug is inserted into a test terminal that is different from the place to be inserted by mistake. If a test plug is inserted into the wrong test terminal, an accident will occur in which the protective relay is activated and the line is interrupted.
In order to prevent such an accident, Patent Document 1 describes a trip lock circuit that prevents a circuit breaker disconnection signal generated when a protective relay is activated from reaching the circuit breaker. This circuit includes a test terminal short-circuit piece for mechanically opening and closing the signal line on the signal line connecting the protective relay and the circuit breaker. The test terminal short-circuit piece is arranged across the test terminal insertion slot, and the test plug cannot be inserted unless the test terminal short-circuit piece is removed. Therefore, even if the protective relay is activated when the test plug is inserted, the circuit breaker does not operate, so that it is possible to prevent an accident such as a power failure of the line.
However, in the invention of Patent Document 1, when an attempt is made to insert a test plug into a test terminal that is in a non-energized state and the operation is accidentally continued while the test plug is inserted into a test terminal that is in a live state, a protective relay May cause accidents that may cause electric shock to workers.

  In order to solve the above-mentioned problem, Patent Document 2 describes a test plug that can display the active state of a plug conductor. According to the present invention, since the active state of the plug conductor is known, it is possible to prevent erroneous insertion of the test plug.

JP-A-60-170415 JP 2008-190949 A

However, in the invention of Patent Document 2, since the protective relay is disconnected from the current transformer and connected to the test circuit at the same time as the test plug connected to the test device is inserted into the test terminal, May be interrupted or the protective circuit may be burned out. Moreover, when using only for confirming an active state, it is necessary to repeat insertion / extraction of the test plug of patent document 2, and the test plug which comprised the test circuit, and there exists a problem that work becomes complicated.
The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a test plug that can confirm the live state of a line and can be easily connected to a test apparatus.

In order to solve the above problems, the invention according to claim 1 includes a first conductor that is electrically connected to the power supply side of the protective relay and a second conductor that is electrically connected to the load side of the protective relay for each phase. A test plug comprising a plug portion to be inserted into a test plug insertion port and a test terminal to which a test apparatus is connected, the fixed side plug unit having the plug portion protruding forward, and the fixed side plug unit A movable side plug unit assembled so as to be capable of reciprocating along a predetermined movement locus, and a detection circuit for detecting a live state of the protective relay, and the fixed side plug unit is insulated. A fixed-side support made of a material, and a first plug conductor and a second plug that are formed to protrude from the front surface of the fixed-side support for each phase and are connected to the first conductor and the second conductor, respectively. With conductor A first fixed-side contactor and a second one that are exposed and arranged on the back surface of the fixed-side support and are electrically connected to the first plug conductor and the second plug conductor for each phase; The movable-side plug unit is made of an insulating material and is supported so as to be reciprocally movable with respect to the back surface of the fixed-side support, and the movable-side support of the movable-side support. The first movable contact and the first movable contact that are arranged on the front surface and switched to the conductive and non-conductive states with the first fixed contact and the second fixed contact in the process of reciprocating the movable support. Two movable contactors, and the first fixed contact and the second fixed contact in a process in which the movable support is reciprocated while being exposed at another part of the front surface of the movable support. Switched to a non-conductive state and connected to the detection circuit. The first detection circuit side contactor, the second detection circuit side contactor, and the first movable side contactor and the second movable side contactor, which are arranged to be exposed on the back surface of the movable side support, are electrically connected to each other. First test terminals connected to each other, and the test terminals comprising second test terminals, and when the movable support is in the first position, the first fixed contact and The second fixed contact, the first movable contact and the second movable contact are in a non-conductive state, and the first fixed contact and the second fixed contact And when the first detection circuit side contact and the second detection circuit side contact are in a conductive state, and the movable support is in the second position, the first fixed side contact and The second stationary contact, the first movable contact and the second movable contact are in a conductive state, and the A test plug configured such that the first fixed contact and the second fixed contact and the first detection circuit side contact and the second detection circuit side contact are in a non-conductive state; Features.
According to the first aspect of the present invention, the detection circuit and the circuit of the test apparatus connected to the test terminal can be switched in a state where the plug portion is inserted into the test plug insertion port.

According to a second aspect of the present invention, in the intermediate position between the first position and the second position, the first stationary contact and the second stationary contact are the first The test plug according to claim 1, wherein the test circuit side contact and the second detection circuit side contact are simultaneously in contact with the first movable contact and the second movable contact. .
According to the second aspect of the present invention, the stationary contact is not in contact with any contact, and the circuit is not opened.
The invention according to claim 3 is characterized in that the test plug according to claim 1 or 2 is configured such that the movable side support is pivotally moved with respect to the fixed side support.
According to the third aspect of the present invention, the detection circuit and the circuit of the test apparatus connected to the test terminal can be switched by a simple operation of rotating the movable support relative to the fixed support.
According to a fourth aspect of the present invention, the test plug according to the first or second aspect is configured such that the movable side support is linearly moved with respect to the fixed side support.
The invention according to claim 4 can switch between the detection circuit and the circuit of the test apparatus connected to the test terminal by a simple operation of linearly moving the movable support relative to the fixed support. .

The invention according to claim 5 is provided with a misinsertion preventing protrusion that protrudes and departs from the plug portion in response to the reciprocating movement of the movable support and prevents the plug portion from entering the test plug insertion port, The test plug according to any one of claims 1 to 4, wherein the erroneous insertion preventing protrusion protrudes from the plug portion when at least the movable support is in the second position.
According to the fifth aspect of the present invention, when the movable support is in the second position, that is, the fixed contact and the movable contact are electrically connected, and the fixed contact and the detection circuit contact are electrically connected. If not, since the test plug cannot be inserted into the plug insertion slot, the circuit is prevented from being opened or connected to the circuit of the test apparatus at the same time as the test plug is inserted.
When the detection circuit detects that the protective relay is in an active state, the invention according to claim 6 protrudes between the fixed side support and the movable side support, and The test plug according to any one of claims 1 to 5, further comprising a projecting member that prevents movement of the movable support.
According to the sixth aspect of the present invention, when the detection circuit detects that the movable support is in the first position and the protective relay is in an active state, the movable support is moved to the second position. This prevents the circuit from being opened or connected to the circuit of the test equipment when the protective relay is live.

  According to the present invention, since it is possible to connect to the test circuit after confirming the live state of the line, it is possible to prevent an unexpected accident such as a power failure accident or an electric shock accident. Moreover, since the state electrically connected to the detection circuit and the state electrically connected to the test terminal can be switched only by rotating the movable support, work efficiency can be improved.

1 is a perspective view of a test plug and a test terminal according to a first embodiment of the present invention. It is sectional drawing which showed the state which inserted the test plug which concerns on 1st embodiment of this invention in the test terminal. 1 is an exploded perspective view of a test plug according to a first embodiment of the present invention. It is a figure which shows arrangement | positioning of a contact, (a) is a figure which shows the back surface of a fixed side support body, (b) is a figure which shows the front surface of a movable side support body. (A) thru | or (c) are the perspective views which observed the contact relationship between rotation of a movable side support body and each contact from the back side of a test plug. It is typical sectional drawing for demonstrating the connection state of a plug conductor and a detection circuit, (a) shows the detection circuit for electric current, (b) is a figure which shows the detection circuit for voltage. It is sectional drawing for demonstrating an incorrect insertion prevention protrusion, (a) shows the state which the protrusion for incorrect insertion prevention was immersed, (b) is a figure which shows the state from which the protrusion for incorrect insertion prevention protruded. It is a figure which shows arrangement | positioning of the contactor which concerns on 2nd embodiment of this invention, (a) is a figure which shows the back surface of a fixed side support body, (b) is a figure which shows the front surface of a movable side support body. is there. (A) thru | or (c) are the perspective views which observed the contact relationship with rotation of the movable side support body which concerns on 2nd embodiment of this invention, and each contactor from the back side of a test plug. It is a perspective view of the test plug which concerns on 3rd embodiment of this invention. It is a disassembled perspective view of the test plug which concerns on 3rd embodiment of this invention. It is a figure which shows arrangement | positioning of the contactor which concerns on 3rd embodiment of this invention, (a) is a figure which shows the back surface of a fixed side support body, (b) is a figure which shows the front surface of a movable side support body. is there. (A) thru | or (c) are the perspective views which observed the contact relationship between the reciprocation of the movable side support body which concerns on 3rd embodiment of this invention, and each contact from the back side of a test plug. It is the perspective view which looked at the misinsertion prevention mechanism from the 2nd plug conductor side, (a) shows the immersion state of the projection for misinsertion prevention, (b) shows a protrusion state, (c) is the elasticity of a coil spring It is a figure which shows the state immersed by deformation | transformation. It is a typical sectional view of a test plug concerning a 4th embodiment of the present invention. (A), (b) is typical sectional drawing which expanded and showed a part of test plug which concerns on 4th embodiment of this invention. It is a circuit diagram which shows the protection system of an electric power system.

[First embodiment]
A first embodiment of the present invention will be described with reference to FIGS. 1 to 3. FIG. 1 is a perspective view of a test plug and a test terminal according to the present embodiment. FIG. 2 is a cross-sectional view showing a state in which the test plug according to the present embodiment is inserted into the test terminal. FIG. 3 is an exploded perspective view of the test plug according to the present embodiment.
The test plug 1 according to the present embodiment includes a stationary contact (20, 22) that is electrically connected to the plug conductor (14, 16), and a movable contact (44, that is switched between a conductive state and a non-conductive state with the stationary contact). 46) and a detection circuit side contact (48, 50: refer to FIG. 4) that switches between a conduction state and a non-conduction state with the fixed side contact point. In the following description, an example of a test plug for current will be described. However, this embodiment can also be applied to a test plug for voltage unless otherwise specified.

  First, the test terminal 200 into which the test plug 1 according to this embodiment is inserted will be described. The test terminal 200 includes a test plug insertion port 202 into which the test plug 1 is inserted, and is fixed to the switchboard 210. In the test terminal 200, a first conductor 204 that is electrically connected to the power supply side of the protective relay and a second conductor 206 that is electrically conductive to the load side of the protective relay are disposed to face each other. The first conductor 204 and the second conductor 206 are each made of a conductive material having flexibility, and a projecting portion 204a and a projecting portion 206a projecting toward other conductors are provided in the middle portion in the test plug insertion direction. The protrusions 204a and 206a are always in contact with each other by the elastic force and are electrically connected. When the plug portion 18 of the test plug 1 is inserted between the first conductor 204 and the second conductor 206, the projection 204 a and the projection 206 a are separated by being pressed by the plug portion 18, and the first conductor 204. And the second conductor 206 is turned off. Then, the first conductor 204 and the first plug conductor 14 of the plug portion 18 are conducted, and the second conductor 206 and the second plug conductor 16 of the plug portion 18 are conducted. The first conductor 204 and the second conductor 206 are arranged side by side in the depth direction in the drawing for each of the B phase, W phase, R phase, and N phase.

Next, the test plug 1 will be described. The test plug 1 includes a fixed-side plug unit 10 with a plug portion 18 protruding forward, a movable-side plug unit 40 assembled so as to be rotatable with respect to the back surface of the fixed-side plug unit 10, and live power of the power system. And a detection circuit (see FIG. 6) for detecting the state.
The fixed-side plug unit 10 is a portion that does not move relative to the test terminal when it is inserted into the test terminal 200. The fixed-side plug unit 10 includes a fixed-side support 12 made of an insulating material, and is formed in front of the fixed-side support 12 so as to protrude for each of the B phase, W phase, R phase, and N phase, and the first conductor 204 And a plug portion 18 having a first plug conductor 14 (14B, 14W, 14R, 14N) and a second plug conductor 16 (16B, 16W, 16R, 16N) connected to the second conductor 206, respectively. A first fixed-side contact 20 (20B, 20W, 20R) exposed on the back surface of the fixed-side support 12 and electrically connected to the first plug conductor 14 and the second plug conductor 16 for each phase. , 20N) and the second stationary contact 22 (22B, 22W, 22R, 22N), and a bearing 24 that is formed to penetrate from the central part on the back side to the front side and pivotally support the movable side plug unit 40. And centering on the bearing 24 It is formed in a fan shape and is provided with a pivot angle restricting recess 26 to limit the rotation angle of the movable plug unit 40.

The stationary support 12 is a substantially columnar member and has a circular back surface.
The plug portion 18 is a portion that is inserted into the test terminal 200 from the test plug insertion port 202, and the first plug conductor 14 that is a live wire side conductor and the second plug conductor 16 that is a non-live wire side conductor are The substantially flat insulators 28 are disposed so as to be sandwiched therebetween, and the conductors of different phases are arranged side by side at a predetermined interval in the width direction of the insulators 28. An opening 30 is formed at the distal end portion of the insulator 28 on the second plug conductor 16 side so that an erroneous insertion preventing projection 90 described later appears and disappears.
The movable side plug unit 40 is made of an insulating material and is pivotally supported by a predetermined angle range with respect to the back surface of the fixed side support member 12. The movable side support unit 42 is exposed to the front surface of the movable side support member 42. The first movable contactor 44 and the second movable contactor 44 are switched between a conductive state and a nonconductive state with the first fixed side contactor 20 and the second fixed side contactor 22 in the process in which the movable support 42 is rotated. The first fixed contact 20 and the second fixed contact 22 in the process in which the movable support 42 and the movable support 42 are reciprocated while being exposed and disposed at other parts of the front surface of the movable support 42. The first detection circuit side contact 48 and the second detection circuit side contact 50 which are switched between conductive and non-conductive states and connected to the detection circuit (70 or 80), and the back of the movable support 42 The first movable side contactor 44 and the second movable side that are exposed. The test terminals 56 consisting of probe 46 and the respective first test terminal 52 is electrically connected, and a second test terminal 54, and.

The movable support 42 is a substantially cylindrical member, and the front surface having a circular shape is in sliding contact with the back surface of the fixed support. The movable support 42 includes a rotation shaft 58 and a rotation restricting projection 60 that protrude from the front surface toward the fixed support 12. When the rotation shaft 58 is pivotally supported by the bearing 24, the movable support 42 rotates with respect to the back surface of the fixed support 12. Further, the rotation restricting projection 60 is disposed on the base end side of the rotation shaft 58 and moves within the rotation angle restricting recess 26 so that the rotation angle of the movable support 42 is within a predetermined range. Restrict to. In addition, an elliptical columnar cam 62 is formed at the tip of the rotation shaft 58 to allow the erroneous insertion prevention protrusion 90 to protrude from the opening 30 in accordance with the rotation of the movable support 42.
The stationary contact, the movable contact, and the detection circuit contact will be described with reference to FIGS. 4A and 4B are diagrams showing the arrangement of the contacts, wherein FIG. 4A is a diagram showing the back surface of the fixed side support, and FIG. 4B is a diagram showing the front surface of the movable side support. FIGS. 5A to 5C are perspective views of the contact relationship between the rotation of the movable support and the contacts from the back side of the test plug.

As shown in FIG. 4A, on the back surface of the fixed side support 12, a first fixed side contact 20 and a second fixed side contact 22 made of a conductor and formed in an arc shape are bearings. 24 are arranged concentrically around 24. A first fixed contact 20 that is a live contact is disposed on the bearing 24 side, and a second fixed contact 22 that is a non-live contact is disposed on the outer peripheral side. Yes. Moreover, the contacts of different phases are arranged at equal intervals in the circumferential direction. In (a), each phase is assigned to four regions divided by two straight lines that pass through the bearing 24 and are orthogonal to each other. In the figure, the upper right part is a B phase, the lower right part is a W phase, the lower left part is an R phase, and the upper left part is an N phase contact area. In other words, a sector having a central angle of 90 degrees with the bearing 24 as the center is an area of each phase.
As shown in FIG. 4 (b), on the front surface of the movable support 42, a first movable contact 44, a second movable contact 46, and a second movable contact 44 made of a conductor and formed in an arc shape are formed. One detection circuit side contact 48 and a second detection circuit side contact 50 are arranged. A first movable contact 44 and a first detection circuit side contact 48, which are contacts on the live line side, are disposed on the rotating shaft 58 side, and a contact on the non-live line side is disposed on the outer peripheral side. A second movable contact 46 and a second detection circuit contact 50 are arranged. That is, the contact on the live line side and the contact on the non-live line side are arranged concentrically around the rotation shaft 58.
Each contact is arranged at a position corresponding to the fixed contact of each phase exposed on the back surface of the fixed support 12. In the figure, the upper left part is a B phase, the lower left part is a W phase, the lower right part is an R phase, and the upper right part is an area where an N phase contact is arranged. Further, in each phase region, the movable contact (44, 46) and the detection circuit side contact (46, 48) are circumferentially spaced at least at an interval shorter than the circumferential length of the fixed contact. Arranged in the direction.

  The state shown in FIG. 5A shows a state in which the movable side support 42 is in the first position, and the first fixed side contact 20 and the second fixed side contact 22 and the first detection. The circuit side contactor 48 and the second detection circuit side contactor 50 are in contact and are in a conductive state, and the first fixed contactor 20 and the second fixed contactor 22 and the first movable contactor are in contact. 44 and the second movable contact 46 are in a non-conductive state.

When the movable support 42 is rotated in the direction of the arrow A1 from the state of (a), as shown in (b), the first fixed contact 20 and the second fixed contact 22 are the first The detection circuit side contact 48 and the second detection circuit side contact 50, the first movable contact 44 and the second movable contact 46 are simultaneously in contact. The reason for providing the state where the stationary contact is electrically connected to both the detection circuit side contact and the movable side contact is to prevent the circuit via the test plug 1 from being opened even a little.
When the movable support 42 is further rotated in the direction of arrow A1 from the state of (b), the state shown in (c) is obtained. The state shown in (c) shows a state where the movable side support 42 is in the second position, and the first fixed side contact 20 and the second fixed side contact 22 and the first movable side contact. The child 44 and the second movable contact 46 are in a conductive state, and the first fixed contact 20 and the second fixed contact 22, the first detection circuit side contact 48 and the second detection. The circuit side contact 50 is in a non-conductive state.

Further, when in the state (a), the rotation restricting projection 60 abuts against one end of the turning angle restricting recess 26, and when in the state (c), the turning angle restricting recess. 26 is in contact with the other end portion of 26. The rotation restricting projection 60 cannot move beyond the rotation angle restricting recess 26, and the movable support 42 is formed between the rotation angle restricting recess 26 and the rotation restricting projection 60. Due to the function, it is limited to reciprocate within a predetermined angular range. Therefore, terminals of different phases do not conduct.
Here, the detection circuit will be described with reference to FIG. 6A and 6B are schematic cross-sectional views for explaining the connection state between the plug conductor and the detection circuit, where FIG. 6A shows a current detection circuit, and FIG. 6B shows a voltage detection circuit. In this drawing, the first fixed side contact 20 and the second fixed side contact 22 are electrically connected to the first detection circuit side contact 48 and the second detection circuit side contact 50 ( The first position). For convenience of explanation, different phases are shown in one plane in (b).
In the movable support 42, the first detection circuit side contact 48 and the second detection circuit side contact 50 are electrically connected by a conducting wire 72. In addition, a detection circuit that detects a live state of the power system via the conductive wire 72 when the test plug 1 is inserted into the test terminal 200 is built in the movable support 42. The detected active / inactive state is notified to the outside by an LED as a notification means arranged on the back surface of the movable support 42. Note that the notification means may be a visual means other than an LED or an auditory means.

The current detection circuit 70 shown in (a) takes the current flowing through the conductive wire 72 into the current detection circuit 70 by the winding 74 wound around the intermediate portion of the conductive wire 72, and uses this current to make the LED 76. Make it emit light. The LED 76 emits light when current is detected, and does not emit light when no current is detected. In this way, the active / inactive state of the power system can be notified to the outside. The current detection circuit 70 is provided for each phase.
When the plug portion 18 is inserted into the test terminal 200 as described above, the first conductor 204 and the second conductor 206 are separated by the plug portion 18 and the first conductor 204 and the first plug conductor 14 are electrically connected. Then, the second conductor 206 and the second plug conductor 16 become conductive (see FIG. 2). As shown in FIG. 2A, the current detection circuit 70, the first plug conductor 14, and the second plug conductor 16 are connected. When the plug conductor 16 is in a conductive state (first position), the power supply side and the load side of the protective relay are connected by the conducting wire 72, so that the protection is performed before and after the test plug 1 is inserted. There is no substantial change in the circuit configuration, and the protective relay connected via the test terminal 200 does not operate. Therefore, it is possible to prevent a power outage accident of the power system due to erroneous insertion of the test plug 1.

On the other hand, the voltage detection circuit 80 shown in (b) is different from the current detection circuit 70 in that the LED 82 emits light by detecting the interphase voltage. As an example, the phase B and the phase W will be described, but the same applies to the detection of other interphase voltages.
In the voltage detection circuit 80, one terminal of the LED 82 is electrically connected to the B-phase conductor 72B, and the other terminal is electrically connected to the W-phase conductor 72W. The LED 82 emits light when there is a potential difference between the B phase and the W phase, and does not emit light when there is no potential difference. In this way, the active / inactive state of the power system can be notified to the outside.
In addition, when the voltage detection circuit 80 and the first plug conductor 14 and the second plug conductor 16 are in a conductive state (first position), the power supply side and the load side of the protective relay are connected by the conducting wire 72. Therefore, there is no substantial change in the configuration of the protection circuit before and after the test plug 1 is inserted, and the protective relay connected via the test terminal 200 does not operate. Therefore, it is possible to prevent a power outage accident of the power system due to erroneous insertion of the test plug 1.

The erroneous insertion preventing protrusion will be described with reference to FIG. FIGS. 7A and 7B are cross-sectional views for explaining the erroneous insertion preventing protrusion, wherein FIG. 7A shows a state where the erroneous insertion preventing protrusion is immersed, and FIG. 7B shows a state where the erroneous insertion preventing protrusion protrudes. It is. (A) is a figure corresponding to when the movable side support body 42 exists in a 1st position (refer Fig.5 (a)), (b) is when the movable side support body 42 exists in a 2nd position ( It is a figure corresponding to FIG.5 (c).
The erroneous insertion preventing projection 90 is always in contact with the outer surface of the cam 62 formed at the tip of the rotating shaft 58. The amount of protrusion of the erroneous insertion preventing projection 90 from the opening 30 changes according to a change in the distance between the portion of the cam 62 with which the erroneous insertion preventing projection 90 abuts and the rotational center of the rotational shaft 58. When the movable support 42 is rotated in the direction of the arrow A1 from the state (a), the cam 62 presses the erroneous insertion preventing protrusion 90 according to the rotation, and the erroneous insertion prevention is performed as shown in (b). The projection 90 protrudes from the opening 30.
The state of (a) is a case where the first plug conductor 14 and the second plug conductor 16 are electrically connected to the detection circuit. Even if the plug portion 18 is inserted into the test terminal 200, an electric shock accident or There is no risk of power failure. Accordingly, the insertion preventing projection 90 is immersed and the plug portion 18 is allowed to enter the test terminal 200.
The state (b) is a case where the first plug conductor 14 and the second plug conductor 16 are electrically connected to the first movable contact 44 and the second movable contact 46. When the plug portion 18 is inserted into the test terminal 200, there is a possibility that an electric shock accident or a power failure accident may occur depending on the connection state of the test apparatus to the test terminal. Therefore, by protruding the erroneous insertion preventing protrusion 90 from the opening 30, the plug portion 18 is prevented from entering the test terminal 200, thereby preventing an unexpected accident such as an electric shock accident or a power failure.

The usage of the test plug according to this embodiment will be described.
First, a test device for testing the protective relay is connected to the test terminal 56. Next, the movable support 42 is adjusted to the first position, the first fixed contact 20 and the second fixed contact 22, the first detection circuit side contact 48 and the second detection circuit. The side contact 50 is in a conductive state. At this time, the erroneous insertion preventing protrusion 90 is immersed in the insulator 28. Next, the plug unit 18 is inserted into the test terminal 200 from the test plug insertion port 202.
When the LED 76 is lit, the power system is in a live state, so that it corresponds to the situation. For example, when the test plug 1 is inserted into a test terminal different from the test terminal 200 to be originally inserted, the test plug 1 may be temporarily removed and measures may be taken to insert the test plug 1 into the correct test terminal 200 again. it can. When the protection relay test is continued as it is, the movable support 42 is rotated in the direction of arrow A1 to the second position, and a test circuit is formed between the test apparatus and the protection relay. Test the protective relay.
If the LED 76 remains off, the movable support 42 is rotated in the direction of arrow A1 to the second position, and a test circuit is formed between the test apparatus and the protective relay to test the protective relay. Do.
After the test of the protective relay is completed, the movable support 42 is rotated in the arrow A2 direction to the first position, and then the test plug 1 is removed from the test terminal 200.

  As described above, according to the present embodiment, since it is possible to connect to the test circuit after confirming the live state of the line, it is possible to prevent an unexpected accident such as a power failure accident or an electric shock accident. In addition, since the plug conductor can be switched between a state in which the plug conductor is electrically connected to the detection circuit and a state in which the plug conductor is electrically connected to the test terminal by simply rotating the movable support, work efficiency can be improved. In addition, when the movable support is in the second position, the test plug is mechanically blocked from entering the test terminal, so it is sufficient to prevent accidents such as power outages and electric shocks due to human errors. Can get to.

[Second Embodiment]
A second embodiment of the present invention will be described with reference to FIGS. FIG. 8 is a diagram showing the arrangement of the contacts according to the present embodiment, (a) is a diagram showing the back surface of the fixed side support, and (b) is a diagram showing the front surface of the movable side support. . FIGS. 9A to 9C are perspective views of the contact relationship between the rotation of the movable support body and the respective contacts according to the present embodiment, as viewed from the back side of the test plug. In this embodiment, the amount of movement of the movable support when moving from the first position to the second position by changing the arrangement of the contacts exposed from the surfaces of the fixed support and the movable support. There is a feature in that it is increased. Hereinafter, the same members as those in the first embodiment are denoted by the same reference numerals, and the description thereof is omitted.

On the back surface of the fixed side support body 100 shown in FIG. 8A, the arc-shaped first fixed side contactor 102 and the second fixed side contactor 104 are arranged concentrically around the bearing 24. Yes. In the present embodiment, in the figure, the lower outer peripheral side is the B phase, the bearing side is the W phase, the upper bearing side is the R phase, and the outer peripheral side is the N phase of the region divided into the upper and lower parts with the bearing 24 as the center. That is, a sector having a central angle of 180 degrees with the bearing 24 as the center is further divided into two regions in the radial direction to form regions of each phase. In each area, a contact corresponding to each area is arranged. A contact on the live line side is disposed on the bearing side of each region, and a contact on the non-live line side is disposed on the outer peripheral side.
Further, as shown in FIG. 8B, on the front surface of the movable support 110, a first movable contact 112 and a second movable contact 114, which are made of a conductor and formed in an arc shape. The first detection circuit side contactor 116 and the second detection circuit side contactor 118 are arranged. The arrangement of each phase on the front surface of the movable side support 110 and the arrangement relationship between the contact on the live line side and the contact on the non-live line side are the same as those of the fixed side support 100. Further, in each phase region, the movable contact (112, 114) and the detection circuit contact (116, 118) are circumferentially spaced at least shorter than the circumferential length of the fixed contact. Arranged in the direction.

FIG. 9A shows a state in which the movable support 110 is in the first position, and the first stationary contact 102 and the second stationary contact 104 are in contact with the first detection circuit side. The contact 116 and the second detection circuit side contact 118 are in contact with each other and are in a conductive state, and the first fixed contact 102, the second fixed contact 104, the first movable contact 112, and the first contact. The second movable contact 114 is in a non-conductive state.
When rotated in the direction of arrow B from the state of (a), as shown in (b), the first stationary contact 102 and the second stationary contact 104 become the first detection circuit side contact. 116 and the second detection circuit side contactor 118 and the first movable contactor 112 and the second movable contactor 114 are simultaneously in contact with each other.
When the movable support 110 is further rotated in the direction of arrow B from the state of (b), the state shown in (c), that is, the movable support 110 is in the second position, and the first fixed contact 102. The second fixed contact 104 and the first movable contact 112 and the second movable contact 114 are in a conductive state, and the first fixed contact 102 and the second fixed contact 104 are connected. The first detection circuit side contactor 116 and the second detection circuit side contactor 118 become non-conductive.
In this embodiment, the contacts of different phases are arranged in a direction crossing the moving direction of the movable support. Specifically, while the movable support moves along an arcuate trajectory, the contacts of different phases are arranged concentrically, that is, arranged side by side in the radial direction, so that the conduction / non-conduction state is switched. At this time, the moving amount (rotation angle) of the movable support can be increased. Therefore, the protrusion amount of the erroneous insertion preventing protrusion can be increased as compared with the first embodiment (see FIG. 7), and the erroneous insertion preventing effect can be enhanced.

[Third embodiment]
A third embodiment of the present invention will be described with reference to FIGS. FIG. 10 is a perspective view of the test plug according to the present embodiment. FIG. 11 is an exploded perspective view of the test plug according to the present embodiment. This embodiment is characterized in that the movable support body moves linearly with respect to the fixed support body. Hereinafter, the same members as those in the first embodiment are denoted by the same reference numerals, and the description thereof is omitted.
The test plug 2 includes a fixed-side plug unit 120 with a plug portion 124 protruding forward, and a movable-side plug unit 140 assembled so as to be linearly reciprocable with respect to the back surface of the fixed-side plug unit 120. ing.
The fixed-side plug unit 120 includes a fixed-side support body 122 made of an insulating material, and a plug portion 124 including the first plug conductor 14 and the second plug conductor 16.
The fixed-side support 122 is a substantially rectangular parallelepiped member, and is formed in a rectangular rear surface so as to penetrate the front of the fixed-side support 122. The movable-side plug unit 140 is arranged in the width direction (arrow C1, The first fixed contact 128 (128B, 128W, 128R, electrically connected to the first plug conductor 14 and the second plug conductor 16 for each phase) 128N) and the second stationary contact 130 (130B, 130W, 130R, 130N). In addition, an opening through which a misinsertion preventing projection 166 protrudes and retracts in accordance with the reciprocating movement of the movable plug unit 140 is formed on the side surface of the insulator 28 that insulates the first plug conductor 14N and the second plug conductor 16N. 31 is formed.

The movable-side plug unit 140 is made of an insulating material and configured to be reciprocally movable in the width direction linearly with respect to the back surface of the fixed-side support member 122. The movable-side plug unit 140 is exposed to the front surface of the movable-side support member 142. The first movable contact 144 and the second fixed contact 128 are switched between a conductive state and a non-conductive state with the first fixed contact 128 and the second fixed contact 130 in the process in which the movable support 142 is reciprocated. The first fixed-side contact 128 and the second fixed-side contact 130 in the process where the movable-side support 142 is reciprocatingly moved while being exposed to the movable-side contact 146 and other parts of the front surface of the movable-side support 142. The first detection circuit side contact 148 and the second detection circuit side contact 150, which are switched between conductive and non-conductive states and connected to the current detection circuit 70, project from the front surface of the movable support. Guide 12 In by being inserted, and a protruding piece 152 for reciprocating the movable support 142 in the arrow C1, C2 direction.
The fixed contact, the movable contact, and the detection circuit contact will be described with reference to FIGS. FIGS. 12A and 12B are diagrams showing the arrangement of the contacts. FIG. 12A is a diagram showing the back surface of the fixed side support, and FIG. 12B is a diagram showing the front surface of the movable side support. FIGS. 13A to 13C are perspective views of the contact relationship between the rotation of the movable support and the respective contacts, as observed from the back side of the test plug.

As shown in FIG. 12A, each phase is assigned to each of four regions divided into two in the long side direction and the short side direction on the back surface of the fixed side support body 122. In the figure, the upper right part is the B phase, the lower right part is the W phase, the upper left part is the R phase, and the lower left part is the N phase area, and contacts corresponding to the respective areas are arranged in each area. . In each region, a first fixed contact 128 and a second fixed contact 130 made of a conductor and formed in a rectangular shape are arranged in a direction intersecting the moving direction of the movable support 142. ing. A first fixed side contact 128 that is a contact on the live line side is disposed in the lower part of the drawing in each region, and a second fixed side that is a contact on the non-hot line side in the upper part of the drawing in each region. A contact 130 is arranged.
As shown in FIG. 12B, on the front surface of the movable side support 142, a first movable side contact 144, a second movable side contact 146, a second movable side contact 146 made of a conductor and formed in a rectangular shape. One detection circuit side contact 148 and a second detection circuit side contact 150 are arranged. The arrangement of each phase on the front surface of the movable side support 142 and the arrangement relationship between the contact on the live line side and the contact on the non-live line side are the same as those of the fixed side support 122. Further, in each phase region, the movable side contacts (144, 146) and the detection circuit side contacts (148, 150) are linearly arranged at an interval shorter than at least the width direction length of the fixed side contacts. Has been.

FIG. 13A shows a state where the movable support 142 is in the first position. In this state, the first fixed-side contact 128 and the second fixed-side contact 130 and the first detection circuit-side contact 148 and the second detection circuit-side contact 150 are in contact and are in a conductive state. In addition, the first fixed contact 128 and the second fixed contact 130 and the first movable contact 144 and the second movable contact 146 are in a non-conductive state.
When the movable support 142 is moved in the direction of the arrow C1 from the state of (a), as shown in (b), the first fixed contact 128 and the second fixed contact 130 are moved to the first The detection circuit side contact 148 and the second detection circuit side contact 150, and the first movable contact 144 and the second movable contact 146 are simultaneously in contact.
When the movable support 110 is further moved in the direction of arrow C1 from the state of (b), the state shown in (c), that is, the movable support 142 is in the second position, and the first fixed contact 128 and The second fixed contact 130, the first movable contact 144 and the second movable contact 146 are in a conductive state, and the first fixed contact 128 and the second fixed contact 130 are connected to each other. The first detection circuit side contact 148 and the second detection circuit side contact 150 become non-conductive.

Here, an erroneous insertion prevention mechanism for preventing the plug portion from entering the test plug insertion port will be described with reference to FIG. FIGS. 14A and 14B are perspective views of the erroneous insertion prevention mechanism as viewed from the second plug conductor side, in which FIG. 14A shows the immersion state of the erroneous insertion prevention protrusion, FIG. 14B shows the protrusion state, and FIG. These are figures which show the state immersed by the elastic deformation of the coil spring. 14A to 14C correspond to FIGS. 13A to 13C, respectively.
The erroneous insertion prevention mechanism 160 includes a link piece 162 whose one end 162a is pressed against the protruding piece 152, a rotation shaft 164 that pivotally supports an intermediate portion of the link piece 162, and the other end of the link piece 162. An insertion prevention protrusion 166 that is pressed by the portion side 162b and protrudes from and exits from the opening 31, and is disposed between the insertion prevention protrusion 166 and the other end side 162b of the link piece 162, and from the insulator 28 to the outside. And a coil spring 168 for immersing the projection 166 for preventing incorrect insertion protruding by elastic force.
The erroneous insertion preventing protrusion 166 moves in a direction opposite to the moving direction thereof as the movable support 142 moves linearly. When the movable support 142 moves from the state shown in (a) in the direction of the arrow C1, the protruding piece 152 presses the one end side 162a, and the link piece 162 rotates about the rotation shaft 164 in the direction of arrow D1. Then, the other end side 162b protrudes the misinsertion preventing projection 166 via the coil spring 168 (state shown in FIG. 5B). In this state, the plug portion 124 is prevented from entering the test terminal 200.

Here, in the width direction inside the test terminal 200, since there is little space in which the erroneous insertion preventing projection 166 can protrude, the movable support 142 is moved in a state where the plug portion 124 is inserted into the test terminal 200. There is a risk that it will not be possible. Therefore, when the coil spring 168 is disposed between the other end portion 162b of the link piece 162 and the erroneous insertion preventing projection 166 and a predetermined pressing force is applied in the direction in which the erroneous insertion preventing projection 166 is immersed, As shown in FIG. 8C, the erroneous insertion preventing protrusion 166 is immersed in the plug portion 124 by elastic deformation of the coil spring 168.
As described above, according to this embodiment, the same effect as that of the first embodiment can be obtained also by moving the movable support body linearly.
In the present embodiment, the movable side support is configured to reciprocate in the interphase direction of the plug conductors (in the directions of arrows C1 and C2), but the hot wire side conductor and the non-hot wire side conductor direction (in FIG. 10, It may be configured to reciprocate in the vertical direction) or may be configured to reciprocate in the protruding direction of the plug conductor.

[Fourth embodiment]
A fourth embodiment of the present invention will be described with reference to FIG. FIG. 15 is a schematic cross-sectional view of a test plug according to the present embodiment. The present embodiment is characterized in that it includes a movement blocking mechanism that blocks the movement of the movable support when the power system is in an active state. Hereinafter, the same members as those in the first embodiment are denoted by the same reference numerals, and the description thereof is omitted.
The movement blocking mechanism 170 of the test plug 3 is incorporated in the movable support 42 and detects a current flowing in the conductor 72 connecting the first detection circuit side contact 48 and the second detection circuit side contact 50. And a protruding member 178 that normally immerses in the fixed support 12 and protrudes from the fixed support 12 to the movable support 42 by the current detected by the detection circuit 172. And a recess 179 formed on the movable support 42 to receive the projecting member 178 that projects, and a projecting member 178 that presses the projecting member 178 projecting toward the movable support 42 toward the fixed support 12. And release means 180 for immersing 178.
The detection circuit 172 includes a winding 174 that takes the current flowing in the conductor 72 into the circuit, and an electromagnet 176 that temporarily generates a magnetic force by the taken current. The projecting member 178 is made of a magnetic material, and is disposed in the vicinity of the electromagnet 176, specifically, at a position where the projecting member 178 can move to the movable support 42 side under the magnetic force generated by the electromagnet 176.

The usage of the test plug 3 will be described. The movable support 42 is adjusted to the first position, and the first fixed contact 20 and the second fixed contact 22, the first detection circuit side contact 48 and the second detection circuit side contact are arranged. The plug portion 18 is inserted into the test terminal 200 from the test plug insertion port 202 in a state where the power supply 50 is in conduction.
When the power system is in a live state and a current flows in the conducting wire 72, the detection circuit 172 takes in the current and the electromagnet 176 generates a magnetic force. The protruding member 178 is attracted to the electromagnet 176 and protrudes toward the movable side support 42, and the movement of the movable side support 42 is prevented.
Even when the power system is in an active state, the protective relay may be inspected by a test device. In this case, the movable side support 42 may be moved after the release member 180 is pressed from the back side of the movable side support 42 to immerse the protruding member 178 into the fixed side support 12.
In addition, instead of moving the protruding member 178 using the current flowing through the detection circuit 172, a dedicated power source for moving the protruding member 178 is prepared, and the protruding member 178 is moved by receiving the current flowing through the detection circuit 172. You may make it make it. In this case, even if the electric current which flows in the conducting wire 72 is weak, the protrusion member 178 can be reliably protruded to the movable side support body side.

As described above, according to the present embodiment, when the power system is in the live state, the movement of the movable support is blocked by the movement blocking mechanism, so that it is erroneously connected to the test circuit connected to the test terminal. It is possible to prevent power outage accidents and electric shock accidents.
Although the present embodiment has been described with reference to the example of the current movement prevention mechanism, as in the voltage detection circuit 80 (see FIG. 6B) described in the first embodiment, an interphase potential difference is used. Thus, the protruding member can be protruded, and a voltage movement preventing mechanism can be formed.
Moreover, it is good also as a test plug provided with both the alerting | reporting means demonstrated in 1st embodiment, and a movement prevention mechanism.

[Fifth embodiment]
A fifth embodiment of the present invention will be described with reference to FIG. FIGS. 16A and 16B are schematic cross-sectional views showing an enlarged part of the test plug according to the present embodiment. The present embodiment is characterized in that it includes a movement blocking mechanism that blocks the movement of the movable support when the power system is in an active state. Hereinafter, the same members as those in the first and fourth embodiments are denoted by the same reference numerals, and the description thereof is omitted.
The projecting member that prevents the movement of the movable support 42 protrudes from the fixed support 12 to the movable support 42 to prevent the movable support 42 from moving. It is necessary to have strength to counteract. However, when the current flowing in the conducting wire 72 is weak, there is a possibility that the electromagnet 176 cannot generate a magnetic force that causes the protruding member to protrude.
In the movement prevention mechanism 190 according to the present embodiment, when the detection circuit 172 detects the current flowing through the conducting wire 72, the gravity is used to move diagonally downward from the fixed support 12 to the movable support 42. The projecting member 192 that projects, a stopper 194 that is made of a magnetic material and prevents the projecting member 192 from projecting to the movable support 42 at all times, and the projecting member 192 that projects to the movable support 42 side are fixed to the fixed support 12. And release means 196 for pressing the projection member 192 by pressing toward the side.

The stopper 194 only needs to be able to prevent the protruding member 192 from protruding toward the movable side support 42, so that the weight can be reduced compared to the protruding member 178 according to the fourth embodiment. Therefore, the stopper 194 can be operated with a small amount of current flowing in the conducting wire 72. Further, since the projecting member 192 is configured to fall and move in an oblique direction from the fixed side support body 12 toward the movable side support body 42, when the stopper 194 is attracted to the electromagnet 176 side by a magnetic force, It naturally protrudes toward the movable side support 42 due to gravity.
As described above, according to the present embodiment, even when the power system is in an active state and the current flowing in the conductor is weak, the protruding member can be reliably protruded toward the movable side support, Since the movement of the movable support is blocked, it is possible to prevent a power failure accident or an electric shock accident due to erroneous connection to the test circuit connected to the test terminal.

  DESCRIPTION OF SYMBOLS 1, 2, 3 ... Test plug, 10 ... Fixed side plug unit, 12 ... Fixed side support body, 14 ... First plug conductor, 16 ... Second plug conductor, 18 ... Plug part, 20 ... First fixation Side contact, 22 ... second fixed contact, 24 ... bearing, 26 ... rotation angle limiting recess, 28 ... insulator, 30, 31 ... opening, 40 ... movable side plug unit, 42 ... movable side Support body 44... First movable side contactor 46... Second movable side contactor 48... First detection circuit side contactor 50 .. second detection circuit side contactor 52. Test terminal 54 ... Second test terminal 56 ... Test terminal 58 ... Rotating shaft 60 ... Rotation limiting projection 62 ... Cam 70 ... Current detection circuit 72, 72B, 72W ... Conducting wire 74 ... Winding, 76 ... LED, 80 ... Voltage detection circuit, 82 ... LED, 90 ... Protrusion for preventing erroneous insertion, 00 ... fixed side support, 102 ... first fixed side contactor, 104 ... second fixed side contactor, 110 ... movable side support, 112 ... first movable side contactor, 114 ... second movable Side contact, 116 ... first detection circuit side contact, 118 ... second detection circuit side contact, 120 ... fixed side plug unit, 122 ... fixed side support, 124 ... plug part, 126 ... guide part, 128: first fixed contact, 130: second fixed contact, 140: movable plug unit, 142: movable support, 144: first movable contact, 146: second movable Side contact, 148 ... first detection circuit side contact, 150 ... second detection circuit side contact, 152 ... projection piece, 160 ... misinsertion prevention mechanism, 162 ... link piece, 162a ... one end side, 162b ... the other end, 164 ... rotating shaft, 166 ... preventing erroneous insertion Projection, 168 ... Coil spring, 170 ... Movement prevention mechanism, 172 ... Detection circuit, 174 ... Winding, 176 ... Electromagnet, 178 ... Projection member, 179 ... Recess, 180 ... Release means, 190 ... Movement prevention mechanism, 192 ... Projection 194 ... stopper, 196 ... release means, 200 ... test terminal, 202 ... test plug insertion port, 204 ... first conductor, 204a ... convex, 206 ... second conductor, 206a ... convex, 210 ... switchboard , 300 ... line, 302 ... current transformer, 304 ... protective relay, 306 ... circuit breaker, 310 ... test terminal, 312 ... first conductor, 314 ... second conductor, 316 ... test plug insertion slot, 320 ... test Plug, 322, first plug conductor, 324, second plug conductor, 326, test terminal, 330, test device

Claims (6)

A test device is connected to a plug portion that is inserted into a test plug insertion port that includes a first conductor that is electrically connected to the power supply side of the protective relay and a second conductor that is electrically connected to the load side of the protective relay for each phase. A test plug having a test terminal,
A fixed-side plug unit having the plug portion projecting forward; a movable-side plug unit assembled so as to be reciprocally movable along a predetermined movement locus with respect to the back surface of the fixed-side plug unit; A detection circuit for detecting an electric state,
The fixed-side plug unit includes a fixed-side support made of an insulating material, a first protrusion formed on the front surface of the fixed-side support for each phase, and connected to the first conductor and the second conductor, respectively. The plug portion having the plug conductor and the second plug conductor, and the first plug conductor and the second plug conductor that are exposed on the back surface of the stationary support and are electrically connected to each other. A first fixed side contact and a second fixed side contact,
The movable side plug unit is made of an insulating material and is supported so as to be reciprocally movable with respect to the back surface of the fixed side support. The movable side support is exposed on the front surface of the movable side support. In the process of reciprocating, the first movable side contactor and the second movable side contactor which are switched between conductive and non-conductive state with the first fixed side contactor and the second fixed side contactor, and the movable In a process where the movable support is reciprocated and is exposed at another part of the front surface of the side support, the first fixed contact and the second fixed contact are switched between conductive and non-conductive states, and A first detection circuit side contact and a second detection circuit side contact connected to the detection circuit; and a first movable contact and a second contact arranged to be exposed on a back surface of the movable support. A first test terminal electrically connected to each movable side contact of And said test terminals consisting beauty second test terminal, comprising,
When the movable support is in the first position, the first fixed contact and the second fixed contact, the first movable contact and the second movable contact are not The first fixed side contactor and the second fixed side contactor and the first detection circuit side contactor, and the second detection circuit side contactor are in a conductive state.
When the movable support is in the second position, the first fixed contact and the second fixed contact are electrically connected to the first movable contact and the second movable contact. The first stationary contact and the second stationary contact and the first detection circuit side contact and the second detection circuit side contact are in a non-conductive state. A test plug characterized in that it is configured.   In the intermediate position between the first position and the second position, the first fixed contact and the second fixed contact are the first detection circuit side contact and the second position. 2. The test plug according to claim 1, wherein the detection circuit side contactor is simultaneously in contact with the first movable side contactor and the second movable side contactor.   The test plug according to claim 1, wherein the movable side support is pivotally moved with respect to the fixed side support.   The test plug according to claim 1, wherein the movable support is linearly moved with respect to the fixed support.   And a mis-insertion-preventing protrusion that protrudes and retracts from the plug portion in response to the reciprocating movement of the movable support to prevent the plug portion from entering the test plug insertion port, 5. The test plug according to claim 1, wherein the test piece protrudes from the plug portion when the movable support is in the second position. 6.   When the detection circuit detects that the protective relay is in a live state, the protective relay protrudes between the fixed side support and the movable side support to prevent the movement of the movable side support. 6. The test plug according to claim 1, further comprising a protruding member.

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