JP2017173203A - Test plug - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a test plug allowing an easy and reliable short-circuit process on a transformer side.SOLUTION: In a test plug 1, when a slide member 4 is at a withdrawal position with regard to a plug body 2, an instrument side slide terminal 8 and a transformer side slide terminal 9 abut against an instrument side conductor 5 and a transformer side conductor 6, thereby a transformer side contactor 33 of each phase is insulated. When the slide member 4 moves to a storage position with regard to the plug body 2, the transformer side slide terminal 9 abuts against a short-circuit conductor 7 while maintaining abutting against the transformer side conductor 6, thereby the transformer side contactor 33 is short-circuited by a short-circuit member 71 connected to the short-circuit conductor 7.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a test plug used for a function test of an instrument transformer.

  Electrical devices such as power distribution boards, relay boards, and control devices are equipped with instruments to perform functional tests and maintenance inspections of instrument transformers such as CT (Current Transformer) circuits and PT (Potential Transformer) circuits. A test terminal is provided that can disconnect the electrical connection to the instrument transformer. The test terminal normally connects the instrument and the instrument transformer, and disconnects the electrical connection between the instrument and the instrument transformer when a test plug is inserted.

  8A, 8B, and 9 show, for example, a four-phase test terminal 11 and a conventional test plug 20 that is inserted into the test terminal 11. FIG. The test terminal 11 includes an insertion port 111 into which the test plug 20 is inserted, and a plurality of pairs, for example, four pairs of instrument side contact pieces 112 and transformer side contact pieces 113 provided in the insertion port 111. The instrument side contact piece 112 and the transformer side contact piece 113 are formed of a conductor such as a metal plate. The instrument side contact piece 112 is electrically connected to the instrument 12, and the transformer side contact piece 113 is electrically connected to the instrument transformer 13. The instrument-side contact piece 112 and the transformer-side contact piece 113 are electrically connected to the instrument 12 and the instrument transformer 13 by being brought into contact with each other by utilizing elasticity or the like that the section itself normally has. Each pair of the instrument side contact piece 112 and the transformer side contact piece 113 is arranged at intervals to prevent a short circuit due to contact.

  The test plug 20 includes a plug main body 21 made of an insulating material, an insertion portion 22 protruding rearward from the plug main body 21, and a plurality of plug terminals 23 provided on the front surface of the plug main body 21. The insertion portion 22 includes an insulating support 221 that protrudes rearward from the plug body 21, and a plurality of pairs of instrument-side contacts 222 and transformer-side contacts 223 that are respectively provided on opposite surfaces of the insulating support 221. Is provided.

  The plug terminal 23 includes an instrument-side terminal portion 231 and a transformer-side terminal portion 232 arranged on the same axis, an instrument-side fastener 233 for connecting and fixing wiring to the instrument-side terminal portion 231, and a transformer-side terminal. A transformer-side fastener 234 for connecting and fixing the wiring to the portion 232 is provided. The instrument-side terminal portion 231 and the transformer-side terminal portion 232 are electrically connected to the instrument-side contact 222 and the transformer-side contact 223 through wirings 211 and 212 provided in the plug body 21, respectively. The plug terminal 23 is provided in the same number as the pair of the instrument side contact 222 and the transformer side contact 223, for example, four.

  As shown in FIG. 8B, when the insertion portion 22 of the test plug 20 is inserted into the insertion port 111 of the test terminal 11, the instrument side contact piece 112 and the transformer side contact piece 113 are pressed by the insertion portion 22. Due to elastic deformation, the contact between the two is released, and the electrical connection between the instrument 12 and the instrument transformer 13 is disconnected. Further, the instrument side contact piece 112 and the instrument side contact piece 222 come into contact with each other, and the transformer side contact piece 113 and the transformer side contact piece 223 come into contact with each other, whereby the instrument side terminal portion 231 and the transformer side terminal portion 232 are brought into contact. The functional test of the instrument 12 and the instrument transformer 13 can be performed via the.

  When a CT circuit is connected as the instrument transformer 13, the CT test plug 20 used for measuring the current of the CT circuit includes four terminals in order to avoid opening the secondary side of the CT circuit. A shorting bar 24 for putting the transformer side terminal portion 232 into a short-circuited state is attached (see, for example, Patent Document 1). The short-circuit bar 24 is attached to the CT test plug 20 so that the transformer-side terminal portion 232 is inserted between the U-shaped grooves, and is fixed by fastening the transformer-side fastener 234. Although only one shorting bar 24 is shown in the figure, for example, three shorting bars 24 are used to short the four transformer side terminal portions 232.

  The shorting bar 24 is attached to the test plug 20 before the test plug 20 is inserted into the test terminal 11. In addition, after the short plug 24 is mounted, the test plug 20 is confirmed to be connected to the test purpose using a tester or the like before being inserted into the test terminal 11. This confirmation operation is performed manually by the operator such that the tester probe is sequentially brought into contact with the instrument side terminal portion 231 and the transformer side terminal portion 232 of the test plug 20.

JP 2009-139305 A

  For example, since 30 to 40 test plugs 20 may be used in one test at a substation, there is a problem that it takes time to perform a short-circuit process by mounting the short-circuit bar 24 and a check operation by a tester. In addition, since the short-circuit bar 24 is manually attached, there is a case where the transformer-side fastener 234 is loosened due to a work mistake and the short-circuit bar 24 is dropped off. Further, due to the deterioration of the test plug 20 over time, the tightening force of the transformer-side fastener 234 is weakened, and the short-circuit bar 24 may fall off. When such a short circuit failure occurs, an abnormal voltage or an abnormal current may occur in the instrument transformer 13. Furthermore, when short-circuiting a large number of test plugs 20, a large number of short-circuit bars 24 are necessary. However, since the number of short-circuit bars 24 may be insufficient due to loss or damage, management of the short-circuit bars 24 is also necessary. Met.

  In addition, when a PT test plug having substantially the same shape as the CT test plug 20 is inserted into a test terminal to which a PT circuit is connected, voltage is applied to the transformer side terminal portion, which may Sometimes there was a risk of a short circuit accident. Conventionally, insulation was performed by covering the transformer side terminal portion using an insulating material such as vinyl tape, but when there were many test plugs used for the function test, the work took time.

  An object of this invention is to provide the test plug which can perform the short circuit process by the side of a transformer easily and reliably.

  In order to solve the above-mentioned problem, the invention according to claim 1 has a plurality of pairs of an instrument side contact piece connected to an instrument and a transformer side contact piece connected to an instrument transformer. The test plug according to the present invention sometimes relates to a test plug that is inserted into a test terminal that makes the instrument side contact piece and the transformer side contact piece contact to electrically connect the instrument and the instrument transformer. , A plurality of slide members, a plurality of pairs of instrument side conductors and transformer side conductors, a plurality of short-circuit conductors, a plurality of instrument side slide terminals, and a plurality of transformer side slide terminals. The insertion portion has an insulating support that protrudes rearward from the plug body, and a plurality of pairs of instrument-side contacts and transformer-side contacts that are respectively provided on opposite surfaces of the insulating support. When inserted between the contact piece and the transformer side contact piece, the electrical connection between the instrument and the instrument transformer is disconnected by the insulating support, and the instrument side contact and the transformer side contact are connected to the instrument side. The contact piece and the transformer side contact piece are brought into contact with each other. The plurality of slide members are slidable between an insertion position to be inserted into the plug body and a drawing position to be pulled out from the plug body, and the instrument side terminal portion and the transformer side terminal portion exposed to the outside of the plug body Respectively. A plurality of pairs of instrument side conductors and transformer side conductors are provided in the plug body, and are connected to a plurality of pairs of instrument side contacts and transformer side contacts, respectively. The plurality of short-circuit conductors are disposed in the vicinity of each transformer-side conductor and are electrically connected to each other. The plurality of instrument-side slide terminals are connected to the instrument-side terminal portion, move with the slide member, and come into contact with the instrument-side conductor when the slide member is in the extraction position and the insertion position. A plurality of transformer-side slide terminals are connected to the transformer-side terminal portion and move together with the slide member. When the slide member is in the extended position, it contacts the transformer-side conductor, and the slide member is in the insertion position. Is in contact with the short-circuit conductor.

  According to the first aspect of the present invention, when the insertion portion is inserted between the instrument side contact piece and the transformer side contact piece of the test terminal, the electric power between the instrument and the instrument transformer is determined by the insulating support. The instrument side contact and the transformer side contact are brought into contact with the instrument side contact piece and the transformer side contact piece, respectively. And when the slide member is in the drawer position, the instrument side terminal portion and the instrument side contact piece of the test terminal are electrically connected via the instrument side slide terminal, the instrument side conductor, and the instrument side contact, The transformer side terminal portion and the transformer side contact piece of the test terminal are electrically connected via the transformer side slide terminal, the transformer side conductor, and the transformer side contact. When the slide member is in the insertion position, the transformer-side slide terminal is brought into contact with the short-circuit conductor, and the transformer-side contact is short-circuited.

  According to a second aspect of the present invention, in the test plug according to the first aspect, the transformer-side slide terminal maintains contact with the transformer-side conductor when the slide member is in the insertion position.

  According to a third aspect of the present invention, in the test plug according to the first aspect, when the slide member is in the extended position, the instrument-side short-circuit conductor that comes into contact with the instrument-side slide terminal, and the slide member is in the extended position There are a plurality of pairs of transformer-side short-circuit conductors that contact the transformer-side slide terminals, and wires that electrically connect the instrument-side short-circuit conductor and the transformer-side short-circuit conductor, and the slide member is in the first insertion position. In this case, the instrument-side slide terminal and the transformer-side slide terminal are brought into contact with the instrument-side conductor and the transformer-side conductor by releasing the contact with the instrument-side short-circuit conductor and the transformer-side short-circuit conductor. When in the second insertion position to be pushed into the plug body rather than the insertion position of 1, the transformer-side slide terminal is in contact with the short-circuit conductor while maintaining contact with the transformer-side conductor.

  According to a fourth aspect of the present invention, in the test plug according to any one of the first to third aspects of the present invention, the test plug includes a lock unit that locks the slide member between the insertion position and the pull-out position.

  According to the first aspect of the present invention, the transformer side can be short-circuited simply by pushing the slide member into the plug body, so that the transformer side is short-circuited using a short-circuit bar as in a conventional test plug. Compared to the above, the short circuit processing can be easily performed and the working time is greatly shortened, so that the burden on the operator can be reduced. Especially when only a few phases are short-circuited in a four-phase or eight-phase multi-phase test plug, the conventional test plug complicates the work of installing the shorting bar, causing an installation error and redoing the work. However, with the test plug of the present invention, the short-circuiting operation is facilitated, and it can be easily confirmed visually whether or not it is short-circuited.

  In addition, unlike the conventional test plug, the shorting bar is not fixed by using the screw of the plug terminal, so that the shorting bar is not dropped due to loosening due to work mistakes or loosening due to aging. Furthermore, since the shorting bar itself for short-circuiting the transformer side becomes unnecessary, the cost of the test plug can be reduced, and the trouble of managing the shorting bar can be eliminated.

  Furthermore, since the electrical connection between the transformer side terminal section and the transformer side contactor is disconnected by moving the slide member to the insertion position, the test plug is used as a test terminal when used as a test plug for PT. It is possible to prevent an electric shock when inserted into the battery and a short circuit accident during work. Moreover, since the insulation work by the side of a transformer by a vinyl tape etc. can be abbreviate | omitted, an operator's burden is also reduced.

  According to the second aspect of the present invention, since the contact between the transformer-side slide terminal and the transformer-side conductor is maintained when the slide member is in the insertion position, the CT test can be performed without using a short-circuit bar. Can be used as a plug.

  According to the third aspect of the present invention, the slide member can be used as a normal test plug by moving it to the drawer position, and the instrument side and the transformer can be used by moving the slide member to the first storage position. It can be electrically separated from the side, and can be used as a test plug for CT or PT by moving the slide member to the second storage position. Therefore, when performing a functional test of an instrument transformer, even if a test plug for CT or PT is not prepared, the transformer is inspected by simply pushing the slide member of the test plug in use into the storage position. be able to. Thereby, the burden of the operator concerning a function test | inspection can be reduced.

  According to the fourth aspect of the present invention, since the slide member can be locked at the insertion position and the pull-out position, occurrence of a short circuit accident due to inadvertent movement of the slide member can be prevented.

FIG. 3 is a perspective view showing an external shape of a test plug according to the first embodiment. FIG. 3 is a longitudinal sectional view of the test plug according to the first embodiment. FIG. 3 is a schematic diagram illustrating functions of a test plug according to the first embodiment. It is sectional drawing of the vertical direction which shows the state which inserted the test plug of Embodiment 1 in the test terminal. FIG. 6 is a longitudinal sectional view of a test plug according to a second embodiment. FIG. 6 is a longitudinal sectional view showing a first insertion position of a test plug according to a third embodiment. FIG. 10 is a longitudinal sectional view showing a second insertion position of the test plug according to the third embodiment. It is sectional drawing of the vertical direction of the conventional test plug and a test terminal. It is a perspective view which shows the external appearance shape of the conventional test plug.

  The present invention will be described below based on the illustrated embodiments.

(Embodiment 1)
FIG. 1 is an external perspective view of a four-phase CT test plug 1, and FIG. 2 is a longitudinal sectional view of the test plug 1. The test plug 1 includes a plug body 2, an insertion portion 3, a slide member 4, an instrument side conductor 5, a transformer side conductor 6, a short-circuit conductor 7, an instrument side slide terminal 8, a transformer side slide terminal 9, and a lock mechanism 10. . The slide member 4, the instrument-side conductor 5, the transformer-side conductor 6, the short-circuit conductor 7, the instrument-side slide terminal 8, the transformer-side slide terminal 9, and the lock mechanism 10 are provided in four sets corresponding to the number of phases. It has been.

  The plug body 2 is made of an insulating material such as plastic and has, for example, a rectangular box shape. The plug body 2 is provided with a storage portion 2a which is a space for slidably storing the slide member 4.

  The insertion portion 3 includes a plate-like insulating support 31 projecting rearward from the plug body 3, and four pairs of instrument-side contacts 32 and transformer-side contacts provided on both opposing surfaces of the insulating support 31. And a child 33. The insulating support 31 is formed of an insulating material as in the plug body 2, and the instrument side contact 32 and the transformer side contact 33 are formed of a metal plate. In the present embodiment, the insulating support 31 is provided along the horizontal direction, and the instrument-side contact 32 and the transformer-side contact 33 are provided on the upper and lower surfaces of the insulating support 31, respectively. Yes.

  As shown in FIG. 2A, the slide member 4 is slidable between a drawing position where it is pulled out from the plug body 2 and an insertion position where it is inserted into the plug body 2 as shown in FIG. It is. Plug terminals 41 are provided on the front side of the slide member 4 so as to be exposed to the outside of the plug body 2.

  The plug terminal 41 includes an instrument-side terminal part 412 and a transformer-side terminal part 413 arranged on the same axis, an instrument-side fastener 414 for connecting and fixing wiring to the instrument-side terminal part 412, and a transformer-side terminal A transformer-side fastener 415 for connecting and fixing the wiring to the portion 413 is provided. Specifically, the instrument-side terminal portion 412 and the transformer-side terminal portion 413 are male male screws, and the instrument-side fastener 414 and the transformer-side fastener 415 are composed of the instrument-side terminal portion 412 and the transformer. Each side terminal portion 413 has an internal thread that is screwed thereto.

  The instrument-side conductor 5 and the transformer-side conductor 6 are made of a metal plate and are provided in the plug body 2. The instrument-side conductor 5 and the transformer-side conductor 6 are electrically connected to the corresponding instrument-side contact 32 and transformer-side contact 33 by wiring 51 and wiring 61, respectively.

  The short-circuit conductor 7 is made of a metal plate, and is arranged in the vicinity of each transformer-side conductor 6 so as to be adjacent to the rear side of the transformer-side conductor 6, that is, the back side of the plug body 2. The short-circuit conductor 7 is electrically connected by a wiring 72 to a short-circuit member 71 disposed in the plug body 2 along the width direction. That is, the plurality of short-circuit conductors 7 are electrically connected to each other via the short-circuit member 71.

  The instrument-side slide terminal 8 is fixed to the rear end side of the slide member 4, and is connected to the instrument-side terminal portion 412 by a wire 81. The instrument-side slide terminal 8 is made of a bent metal plate, and a contact portion that elastically contacts the instrument-side conductor 5 is provided on the distal end side.

  The instrument-side slide terminal 8 abuts on the instrument-side conductor 5 when the slide member 4 is in the extraction position and the insertion position. That is, the instrument-side slide terminal 8 is connected to the instrument-side terminal part 412 and the instrument-side contact 32 via the wiring 81, the instrument-side conductor 5 and the wiring 51 when the slide member 4 is in the drawing position or the insertion position. Are electrically connected.

  The transformer-side slide terminal 9 is fixed to the opposite side of the instrument-side slide terminal 8 on the rear end side of the slide member 4, and is connected to the transformer-side terminal portion 413 by a wire 91. The transformer-side slide terminal 9 is made of a bent metal plate, and a contact portion that elastically contacts the transformer-side conductor 6 and the short-circuit conductor 7 is provided on the distal end side.

  The transformer-side slide terminal 9 contacts the transformer-side conductor 6 when the slide member 4 is in the extended position. Further, the contact portion of the transformer-side slide terminal 9 is formed longer than the instrument-side slide terminal 8, and maintains contact with the transformer-side conductor 6 when the slide member 4 is in the insertion position. At the same time, it contacts the short-circuit conductor 7. That is, the transformer-side slide terminal 9 has the transformer-side terminal portion 413 and the transformer-side contactor 33 via the wire 91, the transformer-side conductor 6 and the wire 61 when the slide member 4 is in the extended position. And electrically connect. Further, when the slide member 4 is in the storage position, the transformer-side slide terminal 9 maintains the connection between the transformer-side terminal portion 413 and the transformer-side contact 33, and the wiring 91, the short-circuit conductor 7, The plurality of transformer-side contacts 33 are short-circuited via the wiring 72 and the short-circuit member 71.

  The lock mechanism (lock means) 10 is a mechanism for locking the slide member 4 at each of the insertion position and the pull-out position. The lock mechanism 10 includes a slit 101 provided on the upper surface of the plug body 2, grooves 102 a and 102 b provided on the upper surface of the slide member 4, and a plate-like lock member inserted into the groove 102 a or the groove 102 b through the slit 101. 103. When the lock member 103 is inserted into the groove 102 a or the groove 102 b through the slit 101, the slide member 4 is inhibited from sliding by the lock member 103. A mechanism for locking the lock member 103 to the slit 101 may be provided in order to prevent the lock member 103 from inadvertently falling out of the slit 101.

  FIG. 3 is a schematic diagram showing the function of the test plug 1. As shown in FIG. 2A, the test plug 1 insulates the transformer-side contactor 33 of each phase when the slide member 4 including the plug terminal 41 is in the extended position with respect to the plug body 2. To do. On the other hand, when the slide member 4 including the plug terminal 41 is in the storage position with respect to the plug body 2, as shown in FIG. And it is electrically connected by the short-circuit member 71 and short-circuited.

  Next, the operation of the test plug 1 will be described. In the CT test plug 1 of the present embodiment, the transformer side of each phase is switched to a short-circuited state according to the contents of the functional test before the functional test of the instrument transformer. As shown in FIG. 2 (A), when the slide member 4 is in the extended position with respect to the plug body 2, the instrument side slide terminal 8 and the transformer side slide terminal 9 are connected to the instrument side conductor 5 and the transformer side. Since it contacts the conductor 6, the transformer-side contact 33 of each phase is insulated.

  When switching the transformer side of the test plug 1 to the short-circuit state, the lock member 103 is extracted from the slit 101 of the plug body 2 and the slide lock of the slide member 4 is released. Next, the slide member 4 is pressed through the plug terminal 41, and the slide member 4 in the drawing position is moved to the insertion position.

  As shown in FIG. 2B, when the slide member 4 is moved to the drawing position with respect to the plug body 2, the transformer-side slide terminal 9 contacts the instrument-side conductor 5 and the transformer-side conductor 6. Thereby, the transformer side contactor 33 of each phase is short-circuited by the short-circuit member 71 connected to the short-circuit conductor 7.

  After the sliding of the slide member 4 is completed, the lock member 103 is inserted into the slit 101 of the plug body 2. Since the lock member 103 is inserted into the groove 102b through the slit 101, the slide member 4 is locked so as not to slide carelessly.

  After the slide of the slide member 4 to the insertion position, the test plug 1 is confirmed using a tester or the like to meet the test purpose, that is, whether the transformer side is in the intended short circuit state. This confirmation work is performed manually by the operator such that the tester probe is sequentially brought into contact with the instrument side terminal portion 412 of the test plug 1.

  After the connection of the test plug 1 is confirmed, the insertion portion 3 is inserted into the insertion port 111 of the test terminal 11 as shown in FIG. The insertion portion 3 is inserted between the instrument side contact piece 112 and the transformer side contact piece 113 while being elastically deformed. The instrument-side contact piece 112 and the transformer-side contact piece 113 are separated from each other by the insulating support 31 of the insertion portion 3, whereby the electrical connection between the instrument 12 and the instrument transformer 13 is disconnected. Further, the instrument side contact 32 and the transformer side contact 33 of the insertion section 3 abut on the instrument side contact 112 and the transformer side contact 113, respectively, so that the instrument side terminal 412 and the transformer side terminal 413 are contacted. And the instrument 12 and the instrument transformer 13 are electrically connected. The transformer-side contact piece 113 of the test terminal 11 is short-circuited by the short-circuit conductor 7 and the short-circuit member 71.

  After the test plug 1 is inserted into the test terminal 11, a measuring instrument is connected to the instrument-side terminal portion 412 and a function test of the instrument transformer 13 is performed.

  As described above, according to the test plug 1 of the present embodiment, the transformer side can be short-circuited only by pushing the slide member 4 into the plug body 2, so that the short-circuit bar as in the conventional test plug can be achieved. Compared to short-circuiting the transformer side by using, it is possible to work easily and the working time is greatly shortened, so that the burden on the operator can be reduced. In particular, in the case of a 4-phase or 8-phase multi-phase type test plug, when only a few of the multiple phases are short-circuited, the mounting of the short-circuit bar is complicated with the conventional test plug. An error occurred and it was necessary to redo the work. However, in the case of the test plug of the present embodiment, the short-circuit process can be easily performed by simply pushing the slide member 4, and it can be easily confirmed visually whether or not the short-circuit is performed.

  In addition, unlike the conventional test plug, the shorting bar is not fixed by using the screw of the plug terminal, so that the shorting bar is not dropped due to loosening due to work mistakes or loosening due to aging. Furthermore, since the shorting bar itself for short-circuiting the transformer side becomes unnecessary, the cost of the test plug 1 can be reduced, and the trouble of managing the shorting bar can be eliminated.

  Furthermore, since the lock mechanism 10 that locks the slide member 4 between the insertion position and the pull-out position is provided, it is possible to prevent occurrence of a short circuit accident due to inadvertent movement of the slide member 4.

(Embodiment 2)
Next, a second embodiment of the present invention will be described. In addition, about the same structure as Embodiment 1, detailed description is abbreviate | omitted using a same sign. The present embodiment relates to a PT test plug 1A.

  As shown in FIG. 5 (A), the test plug 1A of the present embodiment has an insertion direction of the contact portion of the transformer-side slide terminal 9A as compared with the CT test plug 1 described in the first embodiment. The length of is shortened. The transformer-side slide terminal 9A contacts only the short-circuit conductor 7 when the slide member 4 is moved from the pulled-out position shown in FIG. 5A to the insertion position shown in FIG. That is, when the slide member 4 is in the insertion position, the electrical connection between the transformer-side terminal portion 413 and the transformer-side contactor 33 is disconnected.

  Therefore, according to the test plug 1A of the present embodiment, the electrical connection between the transformer side terminal portion 413 and the transformer side contactor 33 is disconnected by moving the slide member 4 to the insertion position. It is possible to prevent an electric shock when the plug 1A is inserted into the test terminal and a short-circuit accident during work. Moreover, since the insulation work by the side of a transformer by a vinyl tape etc. can be abbreviate | omitted, an operator's burden is also reduced.

(Embodiment 3)
Next, a third embodiment of the present invention will be described. In addition, about the same structure as Embodiment 1, detailed description is abbreviate | omitted using a same sign. The present embodiment relates to a so-called regular test plug that is used while being always inserted in the test terminal 11.

  As shown in FIG. 6A, the test plug 1B according to the present embodiment is provided with an instrument-side short-circuit conductor 14, a transformer-side short-circuit conductor 15, and a wiring 16 with respect to the test plug 1 according to the first embodiment. It is different. The instrument-side short-circuit conductor 14 is disposed adjacent to the front of the instrument-side conductor 5 and is provided in each phase in an insulated state. The transformer-side short-circuit conductor 15 is disposed adjacent to the front of the transformer-side conductor 6 and is provided in each phase in an insulated state. The wiring 16 is provided for each phase, and electrically connects the instrument-side short-circuit conductor 14 and the transformer-side short-circuit conductor 15.

  In addition, the test plug 1B according to the present embodiment has a first insertion position as the insertion position of the slide member 4 with respect to the test plug 1 according to the first embodiment, and at the back of the plug body 2 from the first insertion position. The difference is that a second insertion position is provided. Further, the instrument-side slide terminal 8B and the transformer-side slide terminal 9B according to the present embodiment are different from the test plug 1 according to the first embodiment in the length in the insertion direction of the contact portion.

  The instrument side slide terminal 8 </ b> B contacts the instrument side short-circuit conductor 14 and the instrument side conductor 5 simultaneously when the slide member 4 is in the drawn position shown in FIG. Further, the transformer-side slide terminal 9 </ b> B contacts the transformer-side short-circuit conductor 15 and the transformer-side conductor 6 simultaneously when the slide member 4 is in the extended position. Therefore, when the slide member 4 is in the drawer position, the instrument side contact 32 and the transformer side contact 33 are connected to the wiring 51, the instrument side conductor 5, the instrument side slide terminal 8B, the instrument side short-circuit conductor 14, and the wiring 16; Since the transformer side short-circuit conductor 15, the transformer side slide terminal 9B, the transformer side conductor 6, and the wiring 61 are electrically connected, the test plug 1B of the present embodiment is used as a normal test plug. It becomes possible.

  In addition, when the slide member 4 is in the first storage position shown in FIG. 6B, the instrument-side slide terminal 8B releases the contact with the instrument-side short-circuit conductor 14 and is connected only to the instrument-side conductor 5. Abut. When the slide member 4 is in the first storage position, the transformer-side slide terminal 9 </ b> B releases the contact with the transformer-side short-circuit conductor 15 and contacts only the transformer-side conductor 6. Therefore, when the slide member 4 is in the first storage position, the instrument-side contact 32 and the transformer-side contact 33 are electrically disconnected.

  Furthermore, when the slide member 4 is in the second storage position shown in FIG. 7, the transformer-side slide terminal 9 </ b> B contacts the short-circuit conductor 7 while maintaining contact with the transformer-side conductor 6. Therefore, when the slide member 4 is in the second storage position, the instrument-side contact 32 and the transformer-side contact 33 are electrically disconnected, and the transformer-side contact 33 of each phase is short-circuited member 71. Therefore, the test plug 1B of the present embodiment can be used as a test plug for CT.

  As described above, according to the test plug 1B of the present embodiment, the slide member 4 can be used as a normal test plug by moving the slide member 4 to the pull-out position, and the slide member 4 can be used in the first storage position. The transformer side contact 32 and the transformer side contact 33 can be electrically separated by moving to. Furthermore, it can be used as a test plug for CT by moving the slide member 4 to the second storage position. Therefore, even if a CT test plug is not prepared when performing a function test of the CT circuit, the CT circuit can be inspected by simply pushing the slide member 4 of the test plug 1B that is in use into the storage position. . Thereby, it is possible to reduce the burden on the operator for the function inspection of the CT circuit.

  In the third embodiment, the common test plug and the CT test plug are combined. However, like the test plug 1A of the second embodiment, when the slide member 4 is moved to the storage position, the transformer side Ordinary test plugs and PT test plugs may be combined so that the slide terminal 9B contacts only the short-circuit conductor 7.

  Although the embodiment of the present invention has been described in detail above, the specific configuration is not limited to this embodiment, and even if there is a design change or the like without departing from the gist of the present invention, include. For example, although a four-phase test plug has been described as an example, the present invention can be applied to a test plug having two or more phases. Further, when the plug terminal 41 is moved to the insertion position, the transformer-side terminal portion 413 is accommodated in the plug main body 2. However, the transformer-side terminal portion 413 is exposed from the plug main body 2 so as to be transformed with the instrument-side terminal portion 412. The device side terminal portion 413 may be short-circuited with a U-shaped shorting bar.

DESCRIPTION OF SYMBOLS 1, 1A, 1B Test plug 2 Plug main body 3 Insertion part 31 Insulation support body 32 Instrument side contact 33 Transformer side contact 4 Slide member 41 Plug terminal 412 Instrument side terminal part 413 Transformer side terminal part 5 Instrument side conductor 6 Transformer-side conductor 7 Short-circuit conductor 71 Short-circuit member 8, 8B Instrument-side slide terminal 9, 9A, 9B Transformer-side slide terminal 10 Lock mechanism (locking means)
11 Test Terminal 112 Instrument Side Contact 113 Transformer Side Contact 12 Instrument 13 Instrument Transformer 14 Instrument Side Short Conductor 15 Transformer Side Short Conductor

Claims (4)

There are a plurality of pairs of the instrument side contact piece connected to the instrument and the transformer side contact piece connected to the instrument transformer. Normally, the instrument side contact piece and the transformer side contact piece are brought into contact with each other. A test plug inserted into a test terminal electrically connecting the instrument and the instrument transformer,
An insulating support that protrudes rearward from the plug body, and a plurality of pairs of instrument-side contacts and transformer-side contacts provided on opposite surfaces of the insulating support; And the transformer side contact piece, the electrical connection between the instrument and the instrument transformer is disconnected by the insulating support, and the instrument side contact and the transformer side contact are disconnected. An insertion part for bringing a child into contact with the instrument side contact piece and the transformer side contact piece,
It is slidable between an insertion position to be inserted into the plug body and a drawing position to be pulled out from the plug body, and has an instrument side terminal part and a transformer side terminal part exposed to the outside of the plug body. A plurality of slide members;
A plurality of pairs of instrument side conductors and transformer side conductors provided in the plug body and respectively connected to a plurality of pairs of the instrument side contacts and the transformer side contacts;
A plurality of short-circuit conductors arranged in the vicinity of each of the transformer-side conductors and electrically connected to each other;
A plurality of instrument-side slide terminals that are connected to the instrument-side terminal portion, move together with the slide member, and come into contact with the instrument-side conductor when the slide member is in a drawing position and an insertion position;
Connected to the transformer-side terminal, moves with the slide member, contacts the transformer-side conductor when the slide member is in the extended position, and shorts when the slide member is in the insertion position A plurality of transformer-side slide terminals in contact with the conductor;
A test plug characterized by comprising: The transformer-side slide terminal maintains contact with the transformer-side conductor when the slide member is in the insertion position;
The test plug according to claim 1. An instrument-side short-circuit conductor that contacts the instrument-side slide terminal when the slide member is in the drawer position; and a transformer-side short-circuit conductor that contacts the transformer-side slide terminal when the slide member is in the drawer position; Having a plurality of pairs of wires that electrically connect the instrument side short circuit conductor and the transformer side short circuit conductor,
When the slide member is in the first insertion position, the instrument-side slide terminal and the transformer-side slide terminal release the contact with the instrument-side short-circuit conductor and the transformer-side short-circuit conductor, and Abutting the instrument side conductor and the transformer side conductor,
When the slide member is in the second insertion position where it is pushed into the plug body rather than the first insertion position, the transformer-side slide terminal remains in contact with the transformer-side conductor while maintaining contact with the transformer-side conductor. Abuts the short-circuit conductor,
The test plug according to claim 1. Lock means for locking the slide member between the insertion position and the drawer position;
The test plug according to any one of claims 1 to 3, wherein

Images