Transformer substation lightning arrester live-line detection and on-line monitoring method

Abstract

The invention belongs to the technical field of power. A transformer station lightning arrester live-line detection and on-line monitoring method is characterized by comprising the following steps: 1)a novel lightning arrester live-line monitoring and on-line monitoring system is prepared, and the novel lightning arrester live-line monitoring and on-line monitoring system comprises an on-line monitor and a live-line monitoring device; the on-line monitor comprises a precision reference source and a signal acquisition system. The live-line monitoring device comprises a station control monitoring unit and a communication module. and 2) the current on the grounding lead of each lightning arrester in the A-phase lightning arrester group, the B-phase lightning arrester group and the C-phase lightning arrester group is synchronously measured through a measurement module to obtain A, B and C three-phase leakage current, and the amplitude, included angle, resistive current and power data of the three-phase leakage current are calculated through high-order FFT calculation by utilizing the locking relationship of the phase angle difference of the three-phase leakage current, and whether theworking state of the lightning arrester is good or not is determined through comparison with historical data. According to the method, the reliability, accuracy and convenience of live detection areimproved.

Description

technical field [0001] The invention belongs to the technical field of electric power, and in particular relates to a live detection and online monitoring method for a substation lightning arrester. Background technique [0002] At present, the explosion accidents caused by the aging of the valve plate and the deterioration of the electrical performance of the lightning arrester in the operation of the substation occur from time to time. The traditional detection, tracking and monitoring method has many disadvantages, and it cannot detect the internal defects of the lightning arrester effectively and in time, which has brought serious problems to the safe operation of the power grid. serious threat. [0003] The surge arrester live test is mainly based on the two factors of the system voltage and the leakage current—the UI method. The practical problem brought by the UI method is that the resistive current value is an estimated value, which is actually not accurate, and ther...

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Problems solved by technology

[0002] At present, the explosion accidents caused by the aging of the valve plate and the deterioration of the electrical performance of the lightning arrester in the operation of the substation occur from time to time. The traditional detection, tracking and monitoring method has many disadvantages, and it cannot detect the internal defects of the lightning arrester effectively and in time, which has brought serious problems to the safe operation of the power grid. serious threat

[0003] The lightning arrester live test is mainly based on the two factors of the system voltage and the leakage current - the UI method. The practical problem brought by the UI method is that the resistive current value is an estimated value, which is not accurate in reality, and there is a short circuit risk in obtaining the voltage signal

The live measurement method of lightning arrester using UI method is complicated to measure the wiring, which is not conducive to the accurate, fast and efficient work of carrying out live test of lightning arrester

[0004] To judge the status of the arrester, the method of power outage maintenance was the earliest method. Because the field test is mostly to test the leakage current by applying DC voltage, the actual operating condition of the equipment cannot be restored, and hidden faults cannot be found, and the power outage maintenance is not conducive to the stable operation of the system. Manpower Large investment in material and financial resources

[0005] In order to solve the problems of poor anti-interference ability and low measurement accuracy of lightning arrester live detection and online monitoring instruments, it is urgent to develop a method for live detection and online monitoring of lightning arresters in substations and a new live monitoring and online monitoring system for lightning arresters to solve the existing problems in current lightning arrester monitoring.

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