Method of checking alternating current loop of a 500kV transformer substation through carrying out simulated through-type three-phase short circuit

Abstract

The invention provides a method of checking an alternating current loop of a 500kV transformer substation through carrying out simulated through-type three-phase short circuit. According to the method, before the 500kV transformer substation is electrified and put into production, a simulated through-type three-phase short circuit system is carried out so as to check the correctness of the amplitude value, phase, polarity and wiring of the current loop of the whole substation. The method provided by the invention has the following advantages: (1), after problems are discovered, the time for searching and processing the problems is sufficient; (2), the check content for an alternating current secondary loop is more comprehensive and systematic; (3), the polarity wiring condition of a current transformer can be accurately judged; and (4) materials of equipment used in the method are simple and convenient, the workload is less, the current loop of the whole substation can be checked through simple operations, and the workload and test time can be reduced.

Description

technical field [0001] The invention belongs to the electrical technology, and is especially used for detecting the AC current amplitude and phase angle of the terminals of the secondary screen cabinet before the substation is put into production, and the approximate simulation system has a penetrating three-phase short circuit, and judges whether the circuit is correct through the data, so as to ensure the wiring of the circuit Correctness method technology field. Background technique [0002] Current state of the art and existing problems: substation is an important part of power transmission, and the correctness of its AC current loop will affect the safety and stability of the power grid, the normal supply of power and the normal life of people. [0003] The AC current loop system is an important part of the power grid, mainly including the primary part and the secondary part. The primary part includes: bus bar, connecting wires, isolating switch, circuit breaker, main ...

AI Technical Summary

Problems solved by technology

[0002] Current technical status and existing problems: substation is an important part of power transmission, and the correctness of its AC current loop will affect the safety and stability of the power grid, the normal supply of power and the normal life of people

However, whether the polarity is correct cannot be strictly tested, and it is insufficient to reflect how the current loops of the whole station cooperate with each other.

This method requires step-by-step up-flow, and the test equipment is heavy and needs to be transported many times. The workload is heavy, which brings inconvenience to the on-site inspection.

Limited by the resolution and accuracy of testing instruments, some methods can only be tested for substations of 220kV and below. Due to the large impedance of the main transformer of 500kV substations, the transformation ratio of current transformers makes it difficult to test the current loop.

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