CN211577199U - Current test terminal capable of switching three states in electrified manner - Google Patents

Abstract

The utility model discloses a current test terminal capable of switching three states in an electrified way, which comprises a terminal body, a connecting piece device and a short connecting piece device; the connecting piece device is arranged on the terminal body, the short connecting piece device is fixedly connected with the connecting piece device, and the contact and separation of the short connecting piece device and the terminal body are controlled by adjusting the connecting piece device. The utility model provides a can switch over current test terminal of three kinds of states with electricity only needs to twist and moves the automatic switch-over that connecting piece device just can realize that intercommunication state, intercommunication coexist with the short circuit state, pioneering ground makes connecting piece device and short circuit piece device function integration as an organic whole, greatly reduced the risk that probably causes accident of electrified installation short circuit piece.

Description

Current test terminal capable of switching three states in electrified manner

Technical Field

The utility model relates to a transformer substation's secondary equipment binding post field specifically relates to a can switch the current test terminal of three kinds of states with electricity.

Background

A secondary cable of a transformer substation CT is connected to a terminal box from a CT junction box through a field and led to a current test terminal row of a protection screen, and when relay protection scheduled inspection operation is carried out, a short-circuit piece needs to be used for short-circuiting the CT secondary cable scheduled inspection and disconnecting a connecting piece of a terminal. At present, the conventional current test terminal has the following defects: firstly, the short connecting piece needs to be installed in a charged mode for the bus differential timing inspection, and the CT secondary circuit is grounded at multiple points due to the possibility of mistaken collision. Second, poor contact of the mounting tabs may cause burning of the terminals when the load current is high. Third, need install short splicing and disconnection connection piece earlier, whole process step is many, the troublesome poeration, and live-wire operation has the personal risk. Four, conventional shorting bars may have invisible disconnection points inside or at the junction. And fifthly, in the short circuit process, due to the narrow space, the guardian may not timely find that the operator short circuits the wrong other terminals. And sixthly, after the regular inspection operation is finished, in the process of recovering the wiring, misoperation that the short connecting sheet is firstly detached and then the connecting sheet is connected can occur.

Disclosure of Invention

The utility model discloses a solve the problem of the security that the installation short circuit piece probably leads to, provide a can switch the current test terminal of three kinds of states with electricity.

In order to realize the purpose of the utility model, the technical proposal is that:

a current test terminal capable of switching three states in an electrified way comprises a terminal body, a connecting piece device and a short connecting piece device; the connecting piece device is arranged on the terminal body, the short connecting piece device is fixedly connected with the connecting piece device, and the contact and separation of the short connecting piece device and the terminal body are controlled by adjusting the connecting piece device.

Among the above-mentioned scheme, a can switch electric current test terminal of three kinds of states with electricity only needs to twist connecting piece device and just can realize the intercommunication state, the intercommunication coexists with the short circuit state, the automatic switch-over of short circuit state, initiatively makes connecting piece device and short circuit piece device function integration as an organic whole, greatly reduced electrified installation short connecting piece probably cause unexpected risk.

Preferably, the terminal body comprises an insulating partition plate, a supporting steel plate and a wiring device; the wiring equipment is provided with 2 groups; wherein:

the insulation partition plate is provided with the supporting steel plate, and the wiring equipment is symmetrically arranged on the supporting steel plate.

In the above scheme, the 2 groups of wiring devices are symmetrically arranged on the supporting steel plate, and the supporting steel plate is arranged on the insulating partition plate, so that the stability of the whole terminal is stronger.

Preferably, the wiring device comprises a wiring screw, a wiring support plate and a wiring pressure plate; wherein:

the wiring support plate and the wiring pressing plate are arranged on the supporting steel plate, the wiring support plate is arranged above the wiring pressing plate, and the wiring screw penetrates through the wiring support plate and is connected with the wiring pressing plate.

In the scheme, the wiring supporting plate and the wiring pressing plate are both arranged on the supporting steel plate, exposed wires below the wiring pressing plate can be pressed by screwing wiring screws, and the whole wiring device is made of conductive materials.

Preferably, the connecting piece device comprises an adjusting screw, an adjustable connecting piece, a connecting contact, an internal spring, a concave fixed connecting plate, an adjusting spring and an insulating fixed bottom plate; wherein:

the number of the connecting contacts and the number of the built-in springs are both 2, the concave fixed connecting plate is fixedly connected with the supporting steel plate, grooves are symmetrically formed in two ends of the concave fixed connecting plate, the built-in springs are respectively arranged in the two grooves, 2 built-in springs are respectively connected with one ends of 2 connecting contacts, and the other ends of 2 connecting contacts are fixedly connected with the adjustable connecting sheet;

the insulating fixed bottom plate is fixedly connected with the supporting steel plate;

the adjusting screw penetrates through the adjustable connecting sheet and the insulating fixed base plate and is in threaded connection with the adjustable connecting sheet and the insulating fixed base plate;

the adjusting spring is arranged between the adjustable connecting sheet and the insulating fixed base plate and sleeved outside the adjusting screw.

In the scheme, the position of the adjustable connecting piece is changed by controlling the adjusting screw, the two ends of the concave fixing connecting plate are symmetrically provided with the grooves, the inner parts of the two grooves are respectively provided with the built-in springs, and the built-in springs are connected with the connecting contacts and can change the position of the short connecting piece device.

Preferably, the short splicing device comprises a common short-end, a lead short-end, a connector concave body, a short connecting sheet, an L-shaped connecting sheet and a spring telescopic body; wherein:

the spring telescopic body is provided with 2 groups, and is divided into an upper spring telescopic body and a lower spring telescopic body;

one end of the short connecting sheet is fixedly connected with the adjustable connecting sheet;

one end of the L-shaped connecting sheet is fixedly connected with the middle part of the short connecting sheet, and the other end of the L-shaped connecting sheet is arranged in parallel with the short connecting sheet;

the public short-end is arranged above the other end of the short connecting sheet and fixed on the insulating partition plate;

the lead short-end is arranged above the parallel end of the L-shaped connecting sheet and fixed on one side of the wiring supporting plate;

the joint concave body is arranged below the public short-circuit end and is fixedly connected with the public short-circuit end;

the upper spring telescopic body is arranged below the joint concave body and is connected with the joint concave body;

the lower spring telescopic body is arranged on the lower portion of the lead short-circuit end and connected with the lead short-circuit end.

In the scheme, the positions of the short connecting piece and the L-shaped connecting piece in the short connecting piece device determine that the terminal is in a communication state, a communication and short-circuit critical state, a short-circuit and communication critical state and a short-circuit state, and the automatic switching of the communication state, the communication and short-circuit state and the short-circuit state is achieved.

Preferably, the upper spring telescopic body comprises an upper telescopic contact and an upper built-in spring; a groove with a downward opening is formed in the lower portion of the joint concave body, the upper built-in spring is arranged in the groove, and one end of the upper built-in spring is fixedly connected with the bottom of the groove; the upper telescopic contact is fixedly connected with the other end of the upper built-in spring.

In the above scheme, the upper spring telescopic body comprises an upper telescopic contact and an upper built-in spring, is connected with the joint concave body, and is controlled to move through the short connecting sheet.

Preferably, the lower spring telescopic body comprises a lower telescopic contact and a lower built-in spring; the lower part of the lead short-circuiting end is provided with a groove with a downward opening, the lower built-in spring is arranged in the groove, and one end of the lower built-in spring is fixedly connected with the bottom of the groove; and the lower telescopic contact is fixedly connected with the other end of the lower built-in spring.

In the scheme, the lower spring telescopic body comprises a lower telescopic contact and a lower built-in spring, is connected with the short-circuit end of the lead and controls the movement through the L-shaped connecting sheet.

Preferably, a support plate is further arranged on the terminal body, and the support plate and the support steel plate are correspondingly arranged on the other side of the wiring support plate and fixedly connected with the wiring support plate.

In the scheme, the supporting plate is fixedly connected with the supporting steel plate correspondingly, and the terminal internal device is protected.

Preferably, a plurality of current test terminals capable of being switched into three states in an electrified way are arranged in parallel to form a terminal block; the common short-circuit end penetrates through the whole terminal block, and all the current test terminals capable of being switched into three states in an electrified mode are in short circuit connection with the common short-circuit end.

Compared with the prior art, the beneficial effects of the utility model are that:

the utility model provides a can switch over current test terminal of three kinds of states with electricity only needs to twist and moves the automatic switch-over that adjusting screw just can realize that intercommunication state, intercommunication coexist with the short circuit state, pioneering ground makes connection piece and short circuit piece function integration as an organic whole, greatly reduced female poor surely examine electrified installation short circuit piece probably cause unexpected risk, a key operation has also improved the operating efficiency by a wide margin.

Drawings

FIG. 1 is an overall structure of the utility model;

fig. 2 is an overall sectional view of the utility model;

FIG. 3 is a schematic view of the communication state of the utility model;

FIG. 4 is a schematic diagram of the critical states of the communication and shorting of the utility model;

FIG. 5 is a schematic view of the short circuit and the communication critical state of the utility model;

FIG. 6 is a schematic diagram showing the short-circuit state of the utility model;

FIG. 7 is a view showing a multi-terminal arrangement of the present invention;

description of the reference numerals

1. A terminal body; 2. a connecting sheet device; 3. a short patch device; 11. an insulating spacer plate; 12. a support steel plate; 13. a wiring device; 14. a support plate; 21. adjusting screws; 22. an adjustable connecting sheet; 23. a connection contact; 24. a built-in spring; 25. a concave fixed connection plate; 26. adjusting the spring; 27. an insulating fixed baseplate; 31. a common shorting terminal; 32. a wire shorting end; 33. a joint recess; 34. a short connecting sheet; 35. an L-shaped connecting sheet; 36. a spring expansion body; 131. a wiring screw; 132. a wiring support plate; 133. a wiring pressing plate; 361. an upper telescopic contact; 362. an upper built-in spring; 363. a lower retractable contact; 364. the lower part is internally provided with a spring.

Detailed Description

The drawings are for illustrative purposes only and are not to be construed as limiting the patent;

the invention is further explained below with reference to the drawings and examples.

Example 1

As shown in fig. 1 and 7, a current test terminal capable of switching three states in an electrified manner comprises a terminal body 1, a connecting piece device 2 and a short connecting piece device 3; the connecting piece device 2 is arranged on the terminal body 1, the short connecting piece device 3 is fixedly connected with the connecting piece device 2, and the contact and separation of the short connecting piece device 3 and the terminal body 1 are controlled by adjusting the connecting piece device 2.

Among the above-mentioned scheme, but the current test terminal of three kinds of states is switched on with electricity only needs to twist connecting piece device 2 and just can realize the intercommunication state, the intercommunication coexists with the short circuit state, the automatic switch-over of short circuit state, initiatively makes connecting piece device 2 and short circuit piece device 3 function integration as an organic whole, greatly reduced electrified installation short connecting piece probably cause unexpected risk.

Preferably, the terminal body 1 includes an insulating partition plate 11, a support steel plate 12 and a wiring device 13; the wiring device 13 is provided with 2 groups; wherein:

the supporting steel plate 12 is arranged on the insulating partition plate 11, and the wiring devices 13 are symmetrically arranged on the supporting steel plate 12.

In the above scheme, the 2 groups of wiring devices 13 are symmetrically arranged on the supporting steel plate 12, and the supporting steel plate 12 is arranged on the insulating partition plate 11, so that the stability of the whole terminal is stronger.

Preferably, the wiring device 13 includes a wiring screw 131, a wiring support plate 132 and a wiring pressure plate 133; wherein:

the wiring support plate 132 and the wiring pressing plate 133 are both arranged on the support steel plate 12, the wiring support plate 132 is arranged above the wiring pressing plate 133, and the wiring screw 131 penetrates through the wiring support plate 132 and is connected with the wiring pressing plate 133.

In the above solution, the wiring support plate 132 and the wiring pressure plate 133 are both disposed on the support steel plate 12, and the exposed wires under the wiring pressure plate 133 can be pressed by screwing the wiring screw 131, and the whole wiring device 13 is made of a conductive material.

Preferably, the connecting piece device 2 comprises an adjusting screw 21, an adjustable connecting piece 22, a connecting contact 23, an internal spring 24, a concave fixed connecting plate 25, an adjusting spring 26 and an insulating fixed bottom plate 27; wherein:

the number of the connecting contacts 23 and the number of the built-in springs 24 are both 2, the concave fixed connection 25 is fixedly connected with the support steel plate 12, grooves are symmetrically arranged at two ends of the concave fixed connection plate 25, the built-in springs 24 are respectively arranged in the two grooves, the 2 built-in springs 24 are respectively connected with one ends of the 2 connecting contacts 23, and the other ends of the 2 connecting contacts 23 are fixedly connected with the adjustable connecting sheet 22;

the insulating fixed bottom plate 27 is fixedly connected with the supporting steel plate 12;

the adjusting screw 21 penetrates through the adjustable connecting sheet 22 and the insulating fixed base plate 27 and is in threaded connection with the adjustable connecting sheet 22 and the insulating fixed base plate 27;

the adjusting spring 26 is arranged between the adjustable connecting piece 22 and the insulating fixing bottom plate 27, and the adjusting spring 26 is sleeved outside the adjusting screw 21.

In the scheme, the position of the adjustable connecting piece 22 is changed by controlling the adjusting screw 21, the two ends of the concave fixed connecting plate 25 are symmetrically provided with the grooves, the inner parts of the two grooves are respectively provided with the built-in springs 24, the built-in springs 24 are connected with the connecting contact 23, and the position of the short connecting piece device 3 can be changed.

Preferably, the shorting tab device 3 comprises a common shorting end 31, a wire shorting end 32, a connector concave body 33, a shorting connecting piece 34, an "L" connecting piece 35 and a spring telescopic body 36; wherein:

the spring telescopic body 36 is provided with 2 groups, which are divided into an upper spring telescopic body and a lower spring telescopic body;

one end of the short connecting sheet 34 is fixedly connected with the adjustable connecting sheet 22;

one end of the L-shaped connecting sheet 35 is fixedly connected with the middle part of the short connecting sheet 34, and the other end of the L-shaped connecting sheet 35 is arranged in parallel with the short connecting sheet 34;

the common short-end 31 is arranged above the other end of the short connecting sheet 34 and fixed on the insulating partition plate 11;

the lead short-end 32 is arranged above the parallel end of the L-shaped connecting sheet 35 and fixed on one side of the connecting support plate 132;

the joint concave body 33 is arranged below the common short-connection end 31 and is fixedly connected with the common short-connection end 31;

the upper spring telescopic body is arranged below the joint concave body 33 and is connected with the joint concave body 33;

the lower spring expansion body is arranged at the lower part of the lead short-end 32 and is connected with the lead short-end 32.

In the scheme, the positions of the short connecting sheet 34 and the L-shaped connecting sheet 35 in the short connecting sheet device 3 determine that the terminal is in a communication state, a communication and short-circuit critical state, a short-circuit and communication critical state and a short-circuit state, so that the communication state, the communication and short-circuit state coexist and the short-circuit state is automatically switched.

Preferably, the upper spring extension body comprises an upper extension contact 361 and an upper built-in spring 362; a groove with a downward opening is formed in the lower portion of the joint concave body 33, the upper built-in spring 362 is arranged in the groove, and one end of the upper built-in spring is fixedly connected with the bottom of the groove; the upper telescopic contact 361 is fixedly connected to the other end of the upper innerspring 362.

In the above solution, the upper spring expansion body includes an upper expansion contact 361 and an upper built-in spring 362, and is connected to the connector concave 33, and the movement is controlled by the short connection piece 34.

Preferably, the lower spring telescopic body comprises a lower telescopic contact 363 and a lower built-in spring 364; a groove with a downward opening is formed in the lower part of the wire short-circuiting end 32, the lower built-in spring 364 is arranged in the groove, and one end of the lower built-in spring is fixedly connected with the bottom of the groove; the lower telescopic contact 363 is fixedly connected with the other end of the lower built-in spring 364.

In the above scheme, the lower spring expansion body comprises a lower expansion contact 363 and a lower built-in spring 364, which are connected to the wire shorting end 32 and controlled to move by an "L" shaped connecting piece 35.

Preferably, a supporting plate 14 is further disposed on the terminal body 1, and the supporting plate 14 is disposed at the other side of the wiring supporting plate 132 corresponding to the supporting steel plate 12 and is fixedly connected to the wiring supporting plate 132.

In the above scheme, the supporting plate 14 is correspondingly and fixedly connected with the supporting steel plate 12 to protect the internal devices of the terminal.

Preferably, a plurality of current test terminals capable of being switched into three states in an electrified way are arranged in parallel to form a terminal block; the common short-circuit end 31 penetrates through the whole terminal block, and all the current test terminals capable of being switched into three states in an electrified mode are in short circuit connection with the common short-circuit end.

Example 2

As shown in fig. 2, the adjusting screw 21 is screwed upwards, the adjustable connecting piece 22 moves upwards under the elastic force of the compressed adjusting spring 26, and drives the short connecting piece 34 welded on the adjustable connecting piece 22 to move upwards, and the short connecting piece starts to change from the communicating state to the intermediate state and the short connecting state along with the increase of the moving distance, that is, two parts of operations of installing the short connecting piece and detaching the short connecting piece on the conventional current test terminal in an electrified way can be completed only by screwing the adjusting screw 21 upwards.

Example 3

As shown in fig. 3, the terminals are in a connected state. At the moment, the adjusting screw 21 is screwed to the lowest position, the adjustable connecting sheet 22 presses the left and right connecting contacts 23 downwards to the plane of the concave fixed connecting plate 25, the short connecting sheet 34 is located at the lowest position, and the distance between the short connecting sheet and the bottom surfaces of the upper and lower telescopic contacts is equal to the thickness of the adjustable connecting sheet 22. The adjustment spring 26 is compressed to the shortest and the distance that the adjustment screw 21 passes through the insulating fixing base plate 27 is at the longest.

Example 4

As shown in fig. 4, the terminals are in a connected and shorted critical state. At this time, the upward screwing distance of the adjusting screw 21 is set as d, the adjustable connecting piece 22 still compresses the left and right connecting contacts 23 and moves upward for the distance d as a whole, the two connecting contacts 23 are respectively pushed upward to the bottom surface of the adjustable connecting piece 22 by the thrust of the two internal springs 24, and the short-circuit connecting piece 34 moves upward for the distance d and just contacts with the bottom surfaces of the upper and lower telescopic contacts. The adjustment spring 26 is raised a distance d and the distance the adjustment screw 21 passes through the insulating mounting base 27 is reduced by d.

Example 5

As shown in fig. 5, the terminals are in a short and connection critical state. At this time, the adjusting screw 21 is screwed upwards for a distance of 2d, the adjustable connecting piece 22 is just separated from the left and right connecting contacts 23, and the left and right connecting contacts 23 reach the maximum extension distance of 2 d. The short circuit connecting piece 34 moves upwards by a distance 2d, and the spring telescopic body is compressed upwards by a distance d, so that the short circuit state with good contact is realized. The adjustment spring 26 is raised a distance 2d upward and the distance that the adjustment screw 21 passes through the insulating fixing base plate 27 is reduced by 2 d.

Example 6

As shown in fig. 6, the terminals are in a shorted state. At this time, the adjusting screw 21 is screwed upwards for 3d, and the adjustable connecting piece 22 is in a completely disconnected state with 2 connecting contacts for a distance d. The short-circuit connecting piece 34 moves upwards for a distance of 3d, and 2 telescopic contacts are in complete reliable compression contact and are in an optimal short-circuit state. The adjustment spring 26 is raised a distance 3d upward and the distance that the adjustment screw 21 passes through the insulating fixed base plate 27 is reduced by 3d without departing from the insulating fixed base plate 27.

It is obvious that the above embodiments of the present invention are only examples for clearly illustrating the present invention, and are not limitations to the embodiments of the present invention. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. Any modification, equivalent replacement, and improvement made within the spirit and principle of the present invention should be included in the protection scope of the claims of the present invention.

Claims (9)

1. A current test terminal capable of switching three states in an electrified way is characterized by comprising a terminal body (1), a connecting piece device (2) and a short connecting piece device (3); the connecting piece device (2) is arranged on the terminal body (1), the short connecting piece device (3) is fixedly connected with the connecting piece device (2), and the short connecting piece device (3) is controlled to be in contact with and separated from the terminal body (1) by adjusting the connecting piece device (2).

2. The current test terminal capable of being switched among three states in an electrified way according to claim 1, wherein the terminal body (1) comprises an insulating spacing plate (11), a supporting steel plate (12) and a wiring device (13); the wiring equipment (13) is provided with 2 groups; wherein:

the supporting steel plates (12) are arranged on the insulating partition plates (11), and the wiring devices (13) are symmetrically arranged on the supporting steel plates (12).

3. The current test terminal capable of electrically switching between three states as claimed in claim 2, wherein said wiring device (13) comprises a wiring screw (131), a wiring support plate (132) and a wiring pressure plate (133); wherein:

wiring backup pad (132) and wiring clamp plate (133) all set up on supporting steel plate (12), wiring backup pad (132) set up wiring clamp plate (133) top, wiring screw (131) pass wiring backup pad (132) with wiring clamp plate (133) are connected.

4. The current test terminal capable of electrically switching three states according to claim 3, wherein the connecting piece device (2) comprises an adjusting screw (21), an adjustable connecting piece (22), a connecting contact (23), an internal spring (24), a concave fixed connecting plate (25), an adjusting spring (26) and an insulating fixed bottom plate (27); wherein:

the number of the connecting contacts (23) and the number of the built-in springs (24) are both 2, the concave fixed connecting plate (25) is fixedly connected with the supporting steel plate (12), grooves are symmetrically formed in two ends of the concave fixed connecting plate (25), the built-in springs (24) are respectively arranged in the two grooves, 2 built-in springs (24) are respectively connected with one ends of 2 connecting contacts (23), and the other ends of 2 connecting contacts (23) are fixedly connected with the adjustable connecting sheet (22);

the insulating fixed bottom plate (27) is fixedly connected with the supporting steel plate (12);

the adjusting screw (21) penetrates through the adjustable connecting sheet (22) and the insulating fixed base plate (27) and is in threaded connection with the adjustable connecting sheet (22) and the insulating fixed base plate (27);

the adjusting spring (26) is arranged between the adjustable connecting sheet (22) and the insulating fixing bottom plate (27), and the adjusting spring (26) is sleeved outside the adjusting screw (21).

5. The current test terminal capable of electrically switching three states according to claim 4, wherein the shorting tab device (3) comprises a common shorting terminal (31), a wire shorting terminal (32), a connector concave body (33), a shorting connecting piece (34), an L-shaped connecting piece (35) and a spring telescopic body (36); wherein:

the spring telescopic body (36) is provided with 2 groups which are divided into an upper spring telescopic body and a lower spring telescopic body;

one end of the short connecting sheet (34) is fixedly connected with the adjustable connecting sheet (22);

one end of the L-shaped connecting sheet (35) is fixedly connected with the middle part of the short connecting sheet (34), and the other end of the L-shaped connecting sheet (35) is arranged in parallel with the short connecting sheet (34);

the common short-end (31) is arranged above the other end of the short connecting sheet (34) and fixed on the insulating partition plate (11);

the lead short-end (32) is arranged above the parallel end of the L-shaped connecting sheet (35) and is fixed on one side of the wiring supporting plate (132);

the joint concave body (33) is arranged below the common short-connection end (31) and is fixedly connected with the common short-connection end (31);

the upper spring telescopic body is arranged below the joint concave body (33) and is connected with the joint concave body (33);

the lower spring telescopic body is arranged on the lower portion of the lead short-end (32) and connected with the lead short-end (32).

6. The terminal of claim 5, wherein the upper spring extension body comprises an upper extension contact (361) and an upper built-in spring (362); a groove with a downward opening is formed in the lower portion of the joint concave body (33), the upper built-in spring (362) is arranged in the groove, and one end of the upper built-in spring is fixedly connected with the bottom of the groove; the upper telescopic contact (361) is fixedly connected with the other end of the upper built-in spring (362).

7. The current test terminal capable of being switched among three states in an electrified way as claimed in claim 5, wherein the lower spring telescopic body comprises a lower telescopic contact (363) and a lower built-in spring (364); a groove with a downward opening is formed in the lower part of the lead short-circuiting end (32), the lower built-in spring (364) is arranged in the groove, and one end of the lower built-in spring is fixedly connected with the bottom of the groove; the lower telescopic contact (363) is fixedly connected with the other end of the lower built-in spring (364).

8. The current test terminal capable of electrically switching between three states as claimed in claim 7, wherein a support plate (14) is further disposed on the terminal body (1), and the support plate (14) is disposed on the other side of the wiring support plate (132) corresponding to the support steel plate (12) and is fixedly connected to the wiring support plate (132).

9. The three-state current test terminal capable of being switched in an electrified manner as claimed in claim 8, wherein a plurality of the three-state current test terminals capable of being switched in an electrified manner are arranged in parallel to form a terminal block; the common short-circuit end (31) penetrates through the whole terminal block, and all the current test terminals capable of being switched into three states in an electrified mode are in short circuit connection with the common short-circuit end (31).

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