CN-122025380-A - Secondary wiring CT terminal block of switch cabinet current transformer easy to operate

CN122025380ACN 122025380 ACN122025380 ACN 122025380ACN-122025380-A

Abstract

The invention relates to the technical field of CT terminal blocks, and particularly discloses a secondary wiring CT terminal block of a switch cabinet current transformer, which is easy to operate, and comprises an insulating shell, a baffle plate, a first terminal fixing metal piece, a second terminal fixing metal piece, a connecting piece and a short-circuit piece, wherein the baffle plate is arranged in the insulating shell and divides the insulating shell into two groups of chambers; the connecting piece is connected with the first terminal fixing metal piece and/or the second terminal fixing metal piece. The invention greatly improves the working efficiency, and is convenient and efficient to operate.

Inventors

JIA WEI
SHI WENKUI
WANG MINGYUAN
LIN JIANHUA
SHI JINHAO

Assignees

三峡金沙江川云水电开发有限公司

Dates

Publication Date: 20260512
Application Date: 20260325

Claims (10)

1. The secondary wiring CT terminal block of the current transformer of the switch cabinet which is easy to operate is characterized by comprising an insulating shell, a baffle plate, a first terminal fixing metal piece, a second terminal fixing metal piece, a connecting piece and a short circuit piece, wherein the baffle plate is arranged in the insulating shell and divides the insulating shell into two groups of chambers; the connecting piece is connected with the first terminal fixing metal piece and/or the second terminal fixing metal piece.
2. The secondary connection CT terminal block of an easy-to-operate switch cabinet current transformer according to claim 1, wherein the first terminal fixing metal member comprises a first bar-shaped metal block installed in the cavity, a first connecting metal sheet disposed on one side of the first bar-shaped metal block close to the connecting member and used in cooperation with the connecting member, a short-circuit metal clip disposed on the first bar-shaped metal block and used in cooperation with the short-circuit sheet, and a first screw engaged with the first bar-shaped metal block.
3. The secondary wiring CT terminal block of the current transformer of the switch cabinet easy to operate according to claim 2, wherein the short circuit metal clamping piece is of an L-shaped structure and comprises a vertical piece vertically arranged on the strip-shaped metal block and a transverse piece connected with the vertical piece and matched with the short circuit piece for use, and the transverse piece is arranged in parallel with the strip-shaped metal block.
4. The secondary wiring CT terminal block of the current transformer of the switch cabinet easy to operate according to claim 1, wherein the second terminal fixing metal piece comprises a second strip-shaped metal block installed in the cavity, a second connecting metal piece which is arranged on one side of the second strip-shaped metal block close to the connecting piece and matched with the connecting piece for use, and a second screw which is in threaded connection with the second strip-shaped metal block.
5. The secondary connection CT terminal block for a switchgear current transformer according to claim 1, wherein a support base for supporting the first and second terminal fixing metal pieces is provided at the bottom of the chamber, a chute is provided on the support base between the first and second terminal fixing metal pieces, and the connecting piece is installed in the chute and slidably engaged with the chute.
6. The secondary connection CT terminal block for a switchgear current transformer according to claim 5, wherein the connecting member comprises a slider mounted in the chute, a support post mounted on the slider, and an open connection metal clip mounted on the support post and connected to the first and/or second terminal-securing metal members.
7. The secondary connection CT terminal block for a switchgear current transformer according to claim 6, wherein the connecting member further comprises an operation block connected to a side of the support column remote from the slider and located above the first and second terminal fixing metal members.
8. The secondary wiring CT terminal block of the current transformer of the switch cabinet easy to operate according to claim 6, wherein the short circuit pieces comprise a connecting piece, two groups of opening short circuit clamping pieces which are L-shaped structures and are connected with the connecting piece, and a guiding connecting piece for connecting the two groups of opening short circuit clamping pieces, and a gap is formed between the two groups of opening short circuit clamping pieces.
9. The secondary wiring CT terminal block of the current transformer of the switch cabinet easy to operate according to claim 8, wherein the opening short-circuit clamping piece comprises a connecting clamping piece which is connected with the first terminal fixing metal piece and provided with an opening, and a connecting piece which is connected with the connecting clamping piece and the short-circuit piece, and the two groups of guiding connecting pieces are positioned between the two groups of connecting clamping pieces and are respectively connected with the two groups of connecting clamping pieces.
10. The easy-to-operate secondary connection CT terminal block of a switchgear current transformer of claim 8 wherein said baffle plate is provided with a baffle slot of L-shape for slidably mounting an open shorting clip.

Description

Secondary wiring CT terminal block of switch cabinet current transformer easy to operate Technical Field The invention relates to the technical field of CT terminal blocks, in particular to a secondary wiring CT terminal block of a switch cabinet current transformer, which is easy to operate. Background In a large hydropower station, the voltage of an outlet bus of a generator is converted into 400V three-phase alternating current through a plant high voltage transformer and a plant variable voltage transformer, and a 10kV switch cabinet is used as a hub for the plant high voltage transformer and the plant variable voltage transformer, so that a reliable power supply is provided for power consumption of various equipment in the hydropower station plant, and safe and stable operation of a power plant is ensured. And each 10kV switch cabinet is internally provided with a plurality of current transformers (CT for short) for detecting the current on the load line, and the CT converts the primary current into smaller secondary current and is connected to the electric energy metering device and the line protection device. Because the current transformer can not open circuit, CT body side to secondary equipment load side all are connected with special CT terminal row to the short circuit CT when 10kV cubical switchboard carries out primary side high voltage test in the maintenance period, disconnection load. However, the number of 10kV switch cabinets in a large-scale hydroelectric power plant is numerous, primary equipment and secondary equipment in the cabinet are separated clearly, each 10kV switch cabinet is required to be subjected to periodic maintenance of primary equipment independently, secondary maintenance personnel are required to cooperate with primary tests to perform CT short-circuit and load-breaking work of the 10kV switch cabinet, the work is required to be operated on a CT terminal row, and recovery is performed after primary equipment maintenance is completed. The short connection piece and the connection scribing of the traditional CT terminal strip at the present stage are all in a screw fastening mode, and the screw needs to be repeatedly loosened and tightened when CT is sealed and recovered, so that the operation is complicated, phenomena such as screw sliding, screw cap damage, guide connection piece breakage and the like are frequently caused, the working efficiency is low, and a large amount of manpower is wasted. Disclosure of Invention The technical problem to be solved by the invention is to provide the secondary wiring CT terminal block of the switch cabinet current transformer which is easy to operate, so that the working efficiency is greatly improved, and the operation is convenient and efficient; the invention solves the technical problems by adopting the following solution: A secondary wiring CT terminal block of a switch cabinet current transformer easy to operate comprises an insulating shell, a baffle plate, a first terminal fixing metal piece, a second terminal fixing metal piece, a connecting piece and a short-circuit piece, wherein the baffle plate is arranged in the insulating shell and divides the insulating shell into two groups of chambers; the connecting piece is connected with the first terminal fixing metal piece and/or the second terminal fixing metal piece. In some possible embodiments, the first terminal fixing metal piece comprises a first bar-shaped metal block installed in the cavity, a first connecting metal sheet arranged on one side of the first bar-shaped metal block close to the connecting piece and matched with the connecting piece for use, a short-circuit metal clamping piece arranged on the first bar-shaped metal block and matched with the short-circuit sheet for use, and a first screw matched with the first bar-shaped metal block in a threaded mode. In some possible embodiments, the short circuit metal clamping piece is of an L-shaped structure, and comprises a vertical piece vertically installed on the strip-shaped metal block and a transverse piece connected with the vertical piece and matched with the short circuit piece for use, wherein the transverse piece is arranged in parallel with the strip-shaped metal block. In some possible embodiments, the second terminal fixing metal part comprises a second strip-shaped metal block installed in the cavity, a second connecting metal sheet arranged on one side of the second strip-shaped metal block close to the connecting part and matched with the connecting part for use, and a second screw matched with the second strip-shaped metal block in a threaded connection mode. In some possible embodiments, a support seat for supporting the first terminal fixing metal part and the second terminal fixing metal part is arranged at the bottom of the cavity, a sliding groove is arranged on the support seat and between the first terminal fixing metal part and the second terminal fixing metal part, and the connecting pi