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Detection method for insulation performance of arrester considering tertiary voltage harmonic influence

A technology of insulation performance and voltage harmonics, which is applied in the field of lightning arrester insulation performance testing considering the influence of third voltage harmonics, can solve social and economic losses caused by direct power outages, consume power outage time and maintenance time, shorten the service life of arresters, etc. Problems, to achieve The effect of ensuring the safe operation of power equipment, reducing power outage losses, and shortening power outage maintenance time

Inactive Publication Date: 2014-05-07
STATE GRID CORP OF CHINA +2
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Problems solved by technology

This approach requires a lot of power outage time and maintenance time, which not only wastes a lot of maintenance time, shortens the service life of the arrester, but also causes large direct power outage losses and social and economic losses caused by power outages.

Method used

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  • Detection method for insulation performance of arrester considering tertiary voltage harmonic influence
  • Detection method for insulation performance of arrester considering tertiary voltage harmonic influence
  • Detection method for insulation performance of arrester considering tertiary voltage harmonic influence

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Embodiment Construction

[0019] Please refer to 1, the following specifically describes the calculation steps of this embodiment:

[0020] First, measure the total current i flowing through the arrester at each sampling time t x (t), calculate the resistive current at each sampling time t Where: I xm I x (t) The first peak after the waveform crosses zero; T is the cycle time; t 0 I x (t) The first peak value after the zero crossing of the waveform corresponds to the sampling time.

[0021] Furthermore, the Fourier algorithm is used to calculate the full current i x (t) amplitude I x And resistive current i r The magnitude of (t).

[0022] Resistive current i r (t) is composed of the fundamental wave of the resistive current and the odd harmonic currents, and the expansion of the Fourier series is as equation (1).

[0023] i r ( t ) = X k - = 1 ∞ I rk sin kωt = I r 1 sin ωt + I r 3 sin 3 ωt + I r 5 sin 5 ωt + . ...

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Abstract

The invention discloses a detection method for insulation performance of an arrester considering tertiary voltage harmonic influence. The detection method includes the steps that a full current flowing through the arrester is measured, a resistive current is extracted from the full current, the amplitude of the full current and the amplitude of the resistive current are calculated, the amplitude of a fundamental wave resistive current and the amplitude of a triple harmonic resistive current are calculated, insulation performance factors of the arrester are calculated, and detection criterions are formed by the amplitude of the full current, the amplitude of the resistive current, the amplitude of the triple harmonic resistive current and the insulation performance factors of the arrester to judge the insulation performance of the arrester accurately. Performance detection is not affected by tertiary voltage harmonic and interphase coupling capacitance, a detection result is accurate and reliable, the reliable basis is provided for making an arrester maintaining scheme, and the detection method is beneficial for shortening the outage maintenance time and prolonging service life of the arrester and is of important significance in reducing outage loss and guaranteeing safe operation of electrical equipment.

Description

Technical field [0001] The invention relates to the field of protection of power equipment, in particular to a method for detecting the insulation performance of an arrester considering the influence of third voltage harmonics. Background technique [0002] Lightning arresters have good non-linear characteristics and current capacity, can protect high-voltage electrical equipment from overvoltage, and are widely used in power grids. The arrester is connected between the high-voltage line and the ground network, and its own insulation performance directly affects the safety of the protected high-voltage electrical equipment. [0003] The online monitoring technology currently in application is to judge the insulation performance of the arrester by monitoring the full current of the arrester leakage current and the change of the resistive current. When it is detected that the insulation performance of the arrester is deteriorated, the power management department needs to power off t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R31/00
Inventor 林富洪曾惠敏陈文景徐致远李振华林明星
Owner STATE GRID CORP OF CHINA
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