Live detection method for power capacitive equipment

A technology of capacitive equipment and live detection, applied in the direction of environment/reliability testing, measuring electricity, measuring devices, etc., can solve problems affecting the quality of power supply for users and safe operation of the power grid, insulation performance weakening, insulation breakdown, etc., to improve The safe operation level of the power grid, the effect of reducing the failure rate and improving the reliability

Pending Publication Date: 2020-04-21
ELECTRIC POWER OF HENAN LUOYANG POWER SUPPLY +1
View PDF0 Cites 1 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

During the long-term charged operation of capacitive equipment, due to the influence of various factors (environmental pollution, chemical corrosion, heating caused by various reasons, electromotive force, mechanical force, etc.), its insulation performance will gradually weaken, which will cause insulation Breakdown, which can easily cause damage to equipment, and even ca

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Live detection method for power capacitive equipment
  • Live detection method for power capacitive equipment
  • Live detection method for power capacitive equipment

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0027] The present invention will be further described below.

[0028] A live detection method for electric capacitive equipment, comprising the following steps:

[0029] Step 1: Use the third harmonic compensation method of leakage current to detect MOV, and obtain the situation of MOV leakage current;

[0030] S1: Obtain MOA resistive current i by formula (1) r ;

[0031]

[0032] S2: Obtain the MOA capacitive coupling current i by formula (2) c ;

[0033] i c =jωC kk (u k2 -u k1 ) (2);

[0034] where k=1, 2, 3, ..., n;

[0035] Step 2: Calculate the degree of correlation between the leakage current value measured under different environmental conditions and external environmental factors according to the gray relational analysis method. The specific analysis is as shown in Table 1 to Table 5;

[0036] Table 1 Correlation degree between leakage current and external environmental factors when there is no rain in summer and autumn

[0037] Relative hum...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

PUM

No PUM Login to view more

Abstract

A live detection method for power capacitive equipment comprises the following steps: detecting MOV by adopting a leakage current third harmonic compensation method to obtain the condition of MOV leakage current; calculating the correlation degree between the leakage current values measured under different environmental conditions and external environmental factors according to a grey correlationanalysis method; selecting various corresponding measurement data from a previous power failure detection database, processing the data through an intelligent diagnosis algorithm, and establishing a state evaluation data model; carrying out live detection for the leakage current; using a straight-through current transformer to obtain end screen current and lightning arrester grounding current of the capacitive equipment, and obtaining current characteristic information of the equipment through a numerical analysis and fault diagnosis algorithm; evaluating the state of the capacitive equipmentin the obtained state evaluation data model, and comparing the state with the data in the step 4 to form a comprehensive comparative analysis result. According to the method, the operation and maintenance management level of the capacitive equipment can be improved, and large-area power failure accidents can be effectively avoided.

Description

technical field [0001] The invention belongs to the technical field of electric power detection, and relates to a live detection method for electric capacitive equipment. Background technique [0002] The capacitive equipment in the substation is the main electrical equipment in the power system. Its safe operation is related to the safety of the power grid and the quality of power. The safe operation of the capacitive equipment is of great significance to improve the economic and social benefits of enterprises. [0003] Capacitive equipment mainly includes arresters, transformers, high-voltage bushings, voltage transformers, current transformers, etc. With the rapid development of my country's medium and low-voltage power grids, capacitive equipment has been widely used more and more. During the long-term charged operation of capacitive equipment, due to the influence of various factors (environmental pollution, chemical corrosion, heating caused by various reasons, electro...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

Application Information

Patent Timeline
no application Login to view more
IPC IPC(8): G01R31/00G01R31/52G01R31/56
CPCG01R31/003
Inventor 刘方赵发平张萌佘彦杰吕宝宝王晨晨焦珊珊尚德叶青赵怡豪贠飞龙
Owner ELECTRIC POWER OF HENAN LUOYANG POWER SUPPLY
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap