High-precision signal processing method for insulation online monitoring of high-voltage electric-power capacitive equipment

A capacitive device and signal processing technology, applied in measurement devices, measurement of electrical variables, measurement of resistance/reactance/impedance, etc., can solve the problems of lack of reliability, difficulty in practical use, and errors in measurement results.

Inactive Publication Date: 2011-06-15
BEIJING INFORMATION SCI & TECH UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The capacitive equipment is high-voltage equipment, there are a lot of high-voltage flashovers and discharges on site, the electromagnetic interference is very serious, and the sampling signal contains a large number of interference signals; monitoring the insulation of the capacitive equipment requires the leakage current signal and the equipment voltage signal of the equipment, the latter The location of the se

Method used

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  • High-precision signal processing method for insulation online monitoring of high-voltage electric-power capacitive equipment
  • High-precision signal processing method for insulation online monitoring of high-voltage electric-power capacitive equipment
  • High-precision signal processing method for insulation online monitoring of high-voltage electric-power capacitive equipment

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Embodiment Construction

[0022] The present invention will be further described in detail below using the dynamic model test data of insulation degradation of capacitive equipment as the data source.

[0023]The leakage current of capacitive equipment and its bus voltage are collected in real time at a sampling rate of 2500Hz, and pass through the IIRG filter bank (consisting of 60Hz low-pass IIR, 40Hz high-pass IIR and 50Hz point-pass IIR). Set the acquisition system to start sampling and data processing periodically at a timing of 5 seconds, and the specific start time is the beginning of the whole minute and zero second of the satellite clock (GPS). Table 1 is the IIRG filter bank coefficients.

[0024] Table 1 IIRG filter bank coefficients

[0025]

[0026] The impedance parameters of capacitive equipment are R=2.4KΩ, C=0.6uF. The insulation on-line monitoring calculation of this patent is as follows. Table 2 shows the original data of one cycle sampled by the distributed measurement and cont...

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Abstract

The invention discloses a signal processing and calculating method for insulation dielectric dissipation factors with the characteristics of high precision and immunity to electromagnetic interference, which developed by aiming at high-voltage electric-power capacitive equipment for realizing insulation online monitoring technology in the equipment life cycle management of an intelligent power grid. In the scheme, based on distributing type remote synchronous signal collection and through carrying out complete-frequency discrete sampling on the leakage current and the busbar voltage of the high-voltage capacitive equipment in a timing way, an infinite impulse response filter group (IIRG) consisting of a point-pass filter, a low-pass filter, a high-pass filter and a necessary point-resistance filter is arranged by aiming at the interference characteristics of high-voltage electric power equipment, input signal sequences adaptive to the time constants of the IIRG are obtained through signal extension, filter output with 50Hz of power frequency signals is obtained through the IIRG, the phasor phase difference of the leakage current and the busbar voltage of the high-voltage capacitive equipment are obtained with a phase algorithm, and further the insulation dielectric dissipation factors with high precision are obtained.

Description

technical field [0001] The invention relates to insulation on-line monitoring of high-voltage power capacitive equipment, and belongs to the field of state maintenance and on-line monitoring of high-voltage power equipment and the field of monitoring and management of the entire life cycle of equipment in smart grids. Background technique [0002] The power industry is the main body of the energy industry. Ultra-high voltage and ultra-high voltage transmission can achieve longer-distance and higher-efficiency energy transmission. High-voltage insulation technology is the key technology. The vast majority of faults in UHV and EHV power grids manifest as insulation damage. The high-voltage power equipment other than the transmission line is concentrated in the substation, including the main transformer, high-voltage circuit breaker, current transformer (CT), capacitive voltage transformer (CPT), bushing, coupling capacitor, lightning arrester, etc. Most devices are capacitive...

Claims

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Application Information

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IPC IPC(8): G01R27/26
Inventor 李娟
Owner BEIJING INFORMATION SCI & TECH UNIV
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