CN213933954U - Special shorting pad convenient for short-circuit grounding of secondary terminal of current transformer - Google Patents

Abstract

The utility model discloses a special shorting pad convenient to current transformer secondary terminal short circuit ground connection, including box, case lid, shorting pad, draw-in groove, receiver, supporting legs, connecting bolt, socket, through-hole, buckle, handle. The utility model has the advantages that: each terminal of the CT secondary is led to the short-circuit disc for short-circuit, so that the short-circuit conduction condition of each secondary winding can be conveniently checked, and the risk of secondary open circuit is avoided; when carrying out each winding transformation ratio of CT experimental, can directly change experimental wiring in short flange department, avoided the operation of ascending a height repeatedly, it is very convenient, both saved test time, improved work efficiency, reduced the risk that the eminence falls again.

Description

Special shorting pad convenient for short-circuit grounding of secondary terminal of current transformer

Technical Field

The utility model relates to a special shorting stub, specifically be a special shorting stub convenient to current transformer secondary terminal short circuit ground connection belongs to current transformer secondary terminal short circuit ground test technical field.

Background

And in the normal operation or test pressurization process of the current transformer, the secondary winding is strictly forbidden to be open. If the open circuit, the secondary side has not induced current, has lost the demagnetization to once side, and the once side current all becomes exciting current, and the magnetic flux in the iron core will greatly increase, and the iron core is too saturated, and the iron loss sharply increases, and this will produce: 1) the iron core is overheated, even the mutual inductor is burnt; 2) because the number of turns of the secondary winding is large, dangerous high electromotive force can be induced on the secondary side, and the safety of people and equipment is endangered. Therefore, during the test pressurization, the secondary winding terminal needs to be reliably short-circuited to the ground.

In a test that a CT secondary terminal needs to be grounded in a short circuit (such as capacitance and dielectric loss factor test, insulation resistance test, ac withstand voltage, transformation ratio calibration, etc.), a common secondary winding terminal short circuit technical method is as follows:

firstly, each winding terminal is wound and short-circuited by a bare conductor, and then the grounding is led out. Therefore, the device does not meet the regulation of electric power safety regulations (power transformation parts), is easy to fall off and has the risk of secondary open circuit.

Secondly, a plurality of lead clamps are used for clamping all winding terminals in a short circuit way from head to tail and then are led out for grounding. Thus, the method meets the regulation of electric power safety regulation (power transformation part), but the detection of good clamping conduction is inconvenient, and in the CT transformation ratio check test, the test wiring is changed by repeatedly using the auxiliary climbing tool to climb, firstly, the secondary winding terminal box is opened, and the lead of each winding is untied; then a test lead is used for leading the terminal 1S of the secondary winding to be tested into a transformation ratio tester, the other winding terminals are grounded in a short circuit mode, after the 1S winding transformation ratio is tested, when the 2S winding transformation ratio is tested, the winding needs to ascend to the position of a secondary terminal box, test wiring is changed, the 2S terminal is led into a transformation ratio tester, the method comprises the steps of measuring the transformation ratio of a winding, repeatedly ascending the height to change the test wiring, and then carrying out short-circuit grounding on the other winding terminals.

SUMMERY OF THE UTILITY MODEL

The utility model aims at providing a special shorting pad convenient to current transformer secondary terminal short circuit ground connection just for the solution problem.

The utility model discloses a following technical scheme realizes above-mentioned purpose: a special shorting pad convenient for short-circuit grounding of a secondary terminal of a current transformer comprises a box body, a box cover, a storage box and a shorting pad; the utility model discloses a box, including box bottom plate, box top, receiver, short circuit dish, fastening nut, box and case lid, the short circuit dish is settled in the box, the box top is provided with the case lid, just be connected through the hinge between box and the case lid, the bottom fixedly connected with supporting legs of box, just the supporting legs is located the four corners department of box bottom plate respectively, the fixed draw-in groove that is provided with in both sides in the box, the receiver is put in the draw-in groove through the card and is settled together with the box, the short circuit dish is connected with the box through connecting bolt, the bottom of connecting bolt passes the bottom plate of box to fix by fastening nut, the through-hole of seting up on the short circuit dish is passed on connecting bolt's top to fix by fastening nut, be provided with the socket on the short circuit dish, the box is connected through the buckle with the expansion end of case lid.

As a further aspect of the present invention: the clamping grooves are respectively arranged on two sides of the short connecting disc.

As a further aspect of the present invention: the short circuit disc is made of a brass plate with the length of 200mm, the width of 150mm and the thickness of 3 mm.

As a further aspect of the present invention: seven sockets are used as one group on the short connecting disc, three groups are arranged, and each group of sockets are numbered by 1S and 2S.

As a further aspect of the present invention: the socket is a lantern banana socket, and the bottom end of the socket is in close contact with the back of the short-circuit disc through a fastening nut.

As a further aspect of the present invention: the number of the connecting bolts is four, and the connecting bolts are respectively connected in through holes formed in four corners of the short connection disc.

As a further aspect of the present invention: and a handle is arranged on the side plate surface of the box body.

The utility model has the advantages that: the special short circuit disc convenient for the short circuit grounding of the secondary terminals of the current transformer is reasonable in design, when a test item that the CT secondary winding needs the short circuit grounding is carried out, firstly, the short circuit is firm, the short circuit conduction condition can be conveniently checked, the test item that all the secondary winding terminals need the short circuit grounding can be smoothly completed, each terminal of the CT secondary winding is led to the short circuit disc for short circuit, the short circuit conduction condition of each secondary winding can be conveniently checked, and the risk of secondary open circuit is avoided; secondly, when carrying out CT each winding transformation ratio test, avoided ascending repeatedly and changed experimental wiring, it is very convenient, both saved test time, improved work efficiency, reduced the risk that the eminence falls again, furthest guaranteed tester's safety, have very obvious economic and safety benefit.

Drawings

FIG. 1 is a schematic view of the internal top view structure of the present invention;

FIG. 2 is a schematic sectional view of the present invention;

FIG. 3 is a schematic view of the connection structure of the socket and the shorting plate of the present invention;

fig. 4 is a schematic view of the closed structure of the box body and the box cover of the present invention.

In the figure: 1. the box, 2, case lid, 3, shorting flange, 4, draw-in groove, 5, receiver, 6, supporting legs, 7, connecting bolt, 8, socket, 9, through-hole, 10, buckle and 11, handle.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.

Referring to fig. 1-4, a special shorting pad for facilitating short circuit grounding of a secondary terminal of a current transformer comprises a box body 1, a box cover 2, a storage box 5 and a shorting pad 3; the short connecting disc 3 is arranged in the box body 1, the box cover 2 is arranged above the box body 1, the box body 1 is connected with the box cover 2 through a hinge, the bottom end of the box body 1 is fixedly connected with a supporting leg 6, the supporting feet 6 are respectively positioned at the four corners of the bottom plate of the box body 1, the two sides in the box body 1 are fixedly provided with clamping grooves 4, the storage box 5 is arranged together with the box body 1 by being clamped in the clamping groove 4, the short-circuiting disc 3 is connected with the box body 1 by a connecting bolt 7, the bottom end of the connecting bolt 7 penetrates through the bottom plate of the box body 1, and is fixed by a fastening nut, the top end of the connecting bolt 7 passes through a through hole 9 arranged on the short connecting disc 3, and is fixed by a fastening nut, a socket 8 is arranged on the short connecting disc 3, and the movable ends of the box body 1 and the box cover 2 are connected through a buckle 10.

Further, in the embodiment of the utility model provides an in, draw-in groove 4 respectively is provided with one in the both sides of short circuit dish 3, makes two receivers 5 can be settled in the box 1, accomodates the test wire of different colours in the box respectively, and the experimenter of being convenient for takes.

Further, in the embodiment of the present invention, the shorting plate 3 is made of a brass plate with a length of 200mm, a width of 150mm, and a thickness of 3mm, and has good conductivity.

Further, in the embodiment of the utility model provides an in, socket 8 uses seven to be a set of on short circuit dish 3, is provided with three groups, and every group socket 8 adopts 1S, 2S.. 7S to carry out the serial number, when experimental, can be convenient for record the socket 8 serial number that experimental wire is connected to in the staff carries out test operation.

Further, in the embodiment of the utility model provides an, socket 8 is lantern banana socket, and socket 8's bottom is through fastening nut and 3 back in close contact with of short circuit dish for switch on well each other between each socket 8.

Further, in the embodiment of the present invention, the number of the connecting bolts 7 is four, and the connecting bolts are respectively connected in the through holes 9 formed at the four corners of the short flange 3, so as to ensure that the short flange 3 is fixedly connected.

Further, in the embodiment of the present invention, the handle 11 is installed on the side panel surface of the box body 1, so that the worker can conveniently carry the special short-circuiting plate.

The working principle is as follows: when the special shorting pad convenient for the short circuit grounding of the secondary terminals of the current transformer is used, all the secondary winding terminals are clamped by a test wire with a terminal clamp and are led to the special shorting pad 3 which accords with the safe distance, the serial numbers of the secondary terminals correspond to the serial numbers on the shorting pad 3 one by one, and then the shorting pad 3 is grounded and is placed beside a test instrument so as to be convenient to operate. And in a CT ratio check test, a winding to be tested can be directly pulled out from the shorting disc to be led to a test instrument, the rest windings are grounded through the shorting disc 3, after the 1S winding ratio test is finished, the 1S winding is pulled out from the ratio test instrument and then inserted into the shorting disc 3, a 2S winding to be tested is pulled out from the shorting disc 3 and led to the ratio test instrument, and the steps are repeated until all winding ratios are tested. Therefore, repeated ascending and changing of test wiring are avoided, the test is very convenient, the test time is saved, the working efficiency is improved, and the risk of falling from a high place is reduced.

It is obvious to a person skilled in the art that the invention is not restricted to details of the above-described exemplary embodiments, but that it can be implemented in other specific forms without departing from the spirit or essential characteristics of the invention. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.

Furthermore, it should be understood that although the present description refers to embodiments, not every embodiment may contain only a single embodiment, and such description is for clarity only, and those skilled in the art should integrate the description, and the embodiments may be combined as appropriate to form other embodiments understood by those skilled in the art.

Claims (7)

1. A special shorting pad convenient for short-circuit grounding of a secondary terminal of a current transformer comprises a box body (1), a box cover (2), a storage box (5) and a shorting pad (3); the method is characterized in that: the short connecting disc (3) is arranged in the box body (1), the box cover (2) is arranged above the box body (1), the box body (1) is connected with the box cover (2) through hinges, supporting legs (6) are fixedly connected to the bottom end of the box body (1), the supporting legs (6) are respectively located at four corners of a bottom plate of the box body (1), clamping grooves (4) are fixedly formed in two sides of the box body (1), the storage box (5) is placed in the clamping grooves (4) through clamping and is arranged with the box body (1), the short connecting disc (3) is connected with the box body (1) through connecting bolts (7), the bottom end of each connecting bolt (7) penetrates through the bottom plate of the box body (1) and is fixed through fastening nuts, the top end of each connecting bolt (7) penetrates through a through hole (9) formed in the short connecting disc (3) and is fixed through fastening nuts, the short connecting disc (3) is provided with a socket (8), and the box body (1) is connected with the movable end of the box cover (2) through a buckle (10).

2. The special shorting pad for facilitating short circuit grounding of a secondary terminal of a current transformer according to claim 1, wherein: the clamping grooves (4) are respectively arranged on two sides of the short connecting disc (3).

3. The special shorting pad for facilitating short circuit grounding of a secondary terminal of a current transformer according to claim 1, wherein: the short-circuit disc (3) is made of a brass plate with the length of 200mm, the width of 150mm and the thickness of 3 mm.

4. The special shorting pad for facilitating short circuit grounding of a secondary terminal of a current transformer according to claim 1, wherein: seven sockets (8) are arranged on the short connecting disc (3) as a group, three groups are arranged, and each group of sockets (8) are numbered by adopting 1S and 2S.

5. The special shorting pad for facilitating short circuit grounding of a secondary terminal of a current transformer according to claim 4, wherein: socket (8) are lantern banana socket, and the bottom of socket (8) passes through fastening nut and short flange (3) back in close contact with.

6. The special shorting pad for facilitating short circuit grounding of a secondary terminal of a current transformer according to claim 1, wherein: the number of the connecting bolts (7) is four, and the connecting bolts are respectively connected in through holes (9) formed in the four corners of the short connecting disc (3).

7. The special shorting pad for facilitating short circuit grounding of a secondary terminal of a current transformer according to claim 1, wherein: the side plate surface of the box body (1) is provided with a handle (11).

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