A pt pressure-through method

A positive-sequence voltage and relay protection technology, used in instruments, measuring devices, measuring electrical variables, etc., can solve the problems of long voltage-on time, inability to test the accuracy and reliability of the terminal box circuit of the PT body characteristics, and high working intensity. Achieve the effect of correctness and reliability of the secondary circuit, saving the time of the pressure test, and strong practicability

Active Publication Date: 2019-05-07
XIAN THERMAL POWER RES INST CO LTD
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  • Application Information

AI Technical Summary

Problems solved by technology

The traditional PT pressure test is usually carried out at the lower opening of the terminal box of the PT body. The secondary external circuit voltage of the PT is measured by adding a separate amount to each PT secondary winding. This method can verify the correctness of the PT secondary external circuit. and reliability, but it is impossible to test the characteristics of the PT body and the accuracy and reliability of the circuit from the root of the PT to the terminal box of the PT body, and the pressure time is long and the work intensity is high

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Embodiment Construction

[0038] The technical solutions of the present invention will be described in further detail below with reference to the accompanying drawings and examples.

[0039] Such as figure 1 with figure 2 As shown, a kind of PT pressure passing method of the present invention comprises the following steps:

[0040] 1) Carry out the preparatory work for the PT pressure test, and proceed to step 2) after all the preparatory work is completed;

[0041] 2) Turn on the relay protection tester, adjust the relay protection tester to output three-phase positive sequence voltages with different amplitudes, the amplitudes are 0.5V, 1V, 1.5V respectively, and enter step 3);

[0042] 3) Measure and record the actual voltage of the primary side and secondary side of the PT when the relay protection tester outputs positive sequence voltages of three phases with different amplitudes, and proceed to step 4);

[0043] 4) Judging whether the measured voltage values ​​of the primary side and secondar...

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Abstract

The invention belongs to the technical field of power debugging and power testing and particularly relates to a PT voltage applying method. The method comprises steps of during PT voltage applying, connecting a PT secondary three-phase winding and a relay protection tester, outputting three-phase different amplitude positive voltage and three-phase same amplitude positive sequence by the relay protection tester, and measuring and recording PT primary winding voltage and PT other secondary winding secondary voltage respectively. The method can test the integrity and reliability of the overall PT primary and secondary loops at a time while secondary voltage applying on each secondary winding of the PT is not required. The voltage applying test time is saved, the test efficiency is high, the test integrity is strong, the practicality is strong, the usage is convenient, defects of the PT can be rapidly and effectively identified, and the method is suitable for the field of small-size, medium-size and large-size power plant voltage applying testing.

Description

Technical field: [0001] The invention belongs to the technical field of power debugging and power testing, and in particular relates to a PT pressure passing method. Background technique: [0002] At present, my country's economic development speed is increasing, and people's living standards are improving day by day, and the power industry has played a key role in it. At the beginning of the Thirteenth Five-Year Plan, the social power demand is increasing day by day, the scale of the power system is constantly expanding, and the number of new generating units is constantly increasing. [0003] During the electrical commissioning of the newly built unit, it is necessary to ensure that all PTs are correct and reliable, there is no wiring error, and no short circuit phenomenon. Due to the characteristics of high equipment reliability requirements, high voltage level, and complex PT circuit wiring, the electrical main system of the power plant needs to conduct a pressure test ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01R35/02
CPCG01R35/02
Inventor 张钢周亚群寇水潮邵云鹏何信林
Owner XIAN THERMAL POWER RES INST CO LTD
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