A C-type secondary flow method for the main system of a power plant

Abstract

The invention belongs to the technical field of electrical debugging and electrical testing, and particularly relates to a type C secondary flow passage method for a power plant main system. The method comprises the following steps that when the secondary flow passage is adopted, the reference CT is selected by the generator-transformer group protection cabinet current channel, and the reference CT external terminal is shorted to the CT external terminal in the main body terminal box corresponding to the reference CT to form a C-type loop; and the 0.1-fold rated current and the rated current are output by a relay protection tester at the external terminal of the generator-transformer group protection cabinet current channel corresponding to the reference CT, and the amplitude, phase and the secondary load of the secondary loop of the tested CT are detected to verify the integrity and accuracy of its secondary circuit. The type C secondary flow passage method is adopted, and the secondary flow passage test at the CT root is not required, so that the secondary flow passage time is saved. The operation is convenient, the practicality is strong, the test efficiency is high, defects of the secondary loop of the CT can be rapidly and accurately detected, and the method provided by the invention is suitable for the field of secondary flow passage test of small, medium and large generating units.

Description

Technical field: [0001] The invention belongs to the technical field of electrical debugging and electrical testing, and in particular relates to a C-type secondary flow method for the main system of a power plant. Background technique: [0002] At present, China's economy is developing rapidly and people's living standards are improving day by day. The rapid development of the power industry has played a key role in it. At the beginning of the 13th Five-Year Plan, the demand for electricity is increasing day by day, the installed capacity of the power system is constantly increasing, and the number of units under construction is increasing. [0003] During the electrical commissioning process of the new power plant, it is necessary to ensure that all CT connections are correct and there is no open circuit phenomenon, and all PT connections are correct and there is no short circuit phenomenon. Due to the high voltage level, high requirements for equipment operation reliabil...

AI Technical Summary

Problems solved by technology

In the traditional secondary flow method, the flow test is usually carried out in the terminal box of the CT body. Because the terminal box of the CT body of the main electrical system is relatively scattered, it is difficult to connect the power supply for the on-site test, and there are disadvantages such as high work intensity, long flow time, and convenient testing. gender issues

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