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Detection method of resistive current of arrester in cable line based on phase search

A resistive current, cable line technology, applied in the field of online monitoring of power transmission and transformation equipment in power systems, can solve the problems of inaccurate monitoring data, high system failure rate, unreliable operation of insulation monitoring system, etc. The effect of practicality

Active Publication Date: 2017-11-28
CHANGCHUN POWER SUPPLY OF JILIN POWER +2
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Problems solved by technology

According to the current field application results, although there are many types of monitoring devices and their principles are not the same, there are still many problems, mainly manifested in the unreliable operation of the insulation monitoring system, inaccurate monitoring data, and high failure rate of the system.

Method used

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  • Detection method of resistive current of arrester in cable line based on phase search
  • Detection method of resistive current of arrester in cable line based on phase search
  • Detection method of resistive current of arrester in cable line based on phase search

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Embodiment 1

[0025] (1) By the AC data acquisition system, the full current A cycle sampling of points, the full current discrete sequence is obtained k=1,2,...,N, at the same time calculate the full current cycle . See figure 2 As shown in waveform 1;

[0026] (2) According to the full current discrete sequence k=1,2,...,N, find the maximum value in the interval of 75°~85° after the full current crosses zero, considering that the capacitance and resistance are not an ideal 90° angle, and set the maximum value of this interval as Peak Capacitive Leakage Current ;

[0027] (3) Combined capacitive leakage current peak with full current cycle , constructing a standard sinusoidal signal defined as the capacitive leakage current ,See figure 2 As shown in waveform 2, discretization gives k=1,2,...,N, where The initial value is , set the step size l, and start the search process. See figure 2 As shown in waveform 4, waveform 4 moves to the left according to the set ...

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Abstract

The invention relates to a cable line arrester resistive current detection method based on phase search. The method is characterized in that a standard sinusoidal signal is simulated according to an actually measured full current signal, the analog signal is temporarily determined as capacitative current separated from total leakage current, thereby the phase relation between the analogue reference signal and the resistive current can be determined, then different phase shifts are repeatedly used for continuously correcting until the phase reaches to 90-degree phase angle criterion, the novel method is used for achieving resistive current detection specific to conventional arrester resistive current detection methods which obtain a voltage reference signal and not suitable for cable lines and the occasion of difficult obtainment of the voltage signal, during the project, the total leakage current of the arrester is merely required to collect, the actually measured full current information is utilized, the reference signal is simulated according to the amplitude value and period parameters of the full current information, the phase shift is repeatedly performed to achieve phase correction, phases of capacitive component and resistive component are found out, and thereby the cable line arrester resistive current detection is achieved.

Description

technical field [0001] The invention relates to a phase search-based detection method for a resistive current of a cable line lightning arrester, belonging to the technical field of on-line monitoring of power transmission and transformation equipment in a power system. Background technique [0002] The cable line arrester is one of the important equipments in the power system, and its normal operation is very important to the safe power supply of the power system. In recent years, zinc oxide surge arresters (Metal Oxide Surge Arrester, MOA) have gradually replaced other types of surge arresters with their excellent technical performance, and have become the replacement protection equipment for power systems. For zinc oxide arresters, the improvement of protection performance can significantly reduce the insulation level of the protected equipment, thereby reducing costs and greatly improving the reliability of operation. The MOA surge arrester in operation is directly subj...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01R19/00
Inventor 张喜林李国庆王振浩辛业春王冠男
Owner CHANGCHUN POWER SUPPLY OF JILIN POWER
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