Multifunctional three-phase transformer ct loop tester

Abstract

The invention relates to a multi-function loop tester of a three-phase transformer CT (Current Transformer). The multi-function loop tester comprises a primary-side test terminal and a secondary-side test terminal, wherein the primary-side test terminal and the secondary-side test terminal are respectively connected to the primary side and the secondary side of the three-phase transformer, and the primary-side test terminal is electrically connected with the secondary-side test terminal. The primary-side test terminal is composed of a primary-side polarity test module, a primary-side switcher and a three-phase current inductor. The secondary-side test terminal is composed of test terminal blocks, a secondary-side switcher and a secondary-side polarity test module, and the number of the test terminal blocks is six, and the test terminal blocks are respectively connected with the secondary-side switcher. The multi-function loop tester concentrates front and rear switch cabinet working equipment of a polarity test and a loop resistance test into a set of devices in front of a switch cabinet, workers after the switch cabinet are only responsible for the wiring work of a primary three-phase CT and do not need to cooperate with worker before the switch cabinet to operate, and the working strength is reduced.

Description

technical field [0001] The invention belongs to the field of relay protection testing equipment, in particular to a multifunctional three-phase transformer CT loop tester. Background technique [0002] In order to verify whether the polarity of the CT secondary circuit is correct, the polarity test of the CT secondary overall circuit is usually carried out before the relay protection device is put into operation. The test work is completed by two groups of staff. One group of personnel is responsible for the wiring of the primary side of the CT and the on-off of the DC power supply behind the switch cabinet, and the other group of personnel is responsible for the wiring and observation of the secondary circuit of the CT in front of the switch cabinet. Test the reading of the pointer of the instrument, and judge the correctness of the positive polarity of the CT secondary circuit by observing the positive and negative movement of the pointer. [0003] After the CT polarity t...

AI Technical Summary

Problems solved by technology

[0004] In the above detection process, it is necessary to test the secondary circuit of each phase CT, so it is necessary to perform repeated wiring work on the primary and secondary circuits of the CT, which is cumbersome and repetitive, and because the measurement locations of the primary circuit and the secondary circuit of the CT are often Not in the same place, often need to shout or use walkie-talkie to communicate during work, there is a problem of inaccurate information exchange, which easily affects work progress and work quality

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