Total current harmonic vector based electrification testing system and method for early-stage defects of lightning arrester

A live test, full current technology, applied in the field of measurement, can solve problems such as difficulty in accurate acquisition, small third harmonic current value, limitations, etc., to achieve the effect of strong anti-interference ability, high degree of intelligence, and protection of intellectual property rights

Pending Publication Date: 2018-01-09
HUIZHOU POWER SUPPLY BUREAU OF GUANGDONG POWER GRID CO LTD
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  • Abstract
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Problems solved by technology

However, this method has the following disadvantages: ① The third harmonic current value is small, and it is difficult to accurately collect it; ② The third harmonic reflects the non-linearity of the resistance value of the resistor, that is to say, it can only reflect the deterioration of the resistor, but not the arrester Moisture defects, which limit the application of this method
[0011] Due to the above-mentioned shortcomings in the existing lightning arrester live test technology, the validity of the current live test data is insufficient

Method used

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  • Total current harmonic vector based electrification testing system and method for early-stage defects of lightning arrester
  • Total current harmonic vector based electrification testing system and method for early-stage defects of lightning arrester

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Embodiment 1

[0039] Such as figure 1 As shown, a lightning arrester early defect live test system based on the full current harmonic vector, wherein the system includes a lightning arrester full current measurement device and an expert evaluation system;

[0040] The lightning arrester full current measuring device includes a weak current transformer, an input terminal, a filter unit, a range automatic switching unit, an amplification unit, a level bias circuit, an AD sampling unit, a CPU, a storage unit, and a USB interface. The weak current transformer wears The current signal is sampled through the ground wire of the arrester, the output end of which is connected to the input end of the input terminal, the output end of the input terminal is connected to the input end of the filter unit, the output end of the filter unit is connected to the automatic range switching unit, and the output of the automatic range switching unit is terminal is connected to the input terminal of the amplifyin...

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Abstract

The invention relates to the field of measurement and especially relates to a total current harmonic vector based electrification testing system and method for early-stage defects of a lightning arrester. According to the invention, accurate extraction of resistive current and harmonic current components can be realized and correct diagnosis of a lightning arrester state can be realized. by adopting the system and method provided by the invention, an aim of testing conveniently and safely can be achieved and a safe, convenient, efficient and accurate solution is provided for lightning arresteroperation and maintenance.

Description

technical field [0001] The invention relates to the field of measurement, in particular to a system and method for live testing of lightning arrester early defects based on full current harmonic vector. Background technique [0002] The combination of electrification test and infrared detection has become the main means of arrester pre-test. In the practice of the mainstream capacitive current compensation method, due to safety reasons, the secondary signal of PT is not taken, or the reference voltage of the station is used instead, which brings a large principle error, as well as reasons such as on-site phase-to-phase interference and instruments. , the resistive current value cannot be accurately measured, and even misjudgments and missed judgments occur, which affects the effectiveness of the live test technology for the diagnosis of arrester defects. [0003] The capacitive current compensation method is currently the most mature method in principle in live testing of a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R31/00
Inventor 彭刚李谦张云董玉玺彭杰王云龙文志强刘嘉琪卢雪峰黄晓波曾力马志学魏俊涛巫小彬史良
Owner HUIZHOU POWER SUPPLY BUREAU OF GUANGDONG POWER GRID CO LTD
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