Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

Harmonic-component-based anti-interference capacitance measurement method for untransposed transmission line

A technology of transmission lines and measurement methods, which is applied in the directions of measuring devices, measuring electrical variables, measuring resistance/reactance/impedance, etc., and can solve problems such as line power frequency parameter measurement errors, failure to meet measurement requirements, and interference currents that cannot be measured

Active Publication Date: 2015-08-26
WUHAN UNIV
View PDF5 Cites 4 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] However, in the actual measurement, most of the transmission lines below 200km are non-transposition lines, resulting in enhanced interference between non-transposition lines, because the induced voltage phasors of other nearby non-transposition lines on the measurement line are different from each other. zero
Especially in a strong interference environment, the nearby coupling line will induce a large power frequency voltage on the measurement line, that is, power frequency interference, which will bring a large error to the measurement of line power frequency parameters
[0006] Since the interference voltage will change with the power flow of nearby lines, and the interference current caused by the interference voltage cannot be measured, it is difficult to incorporate the interference voltage and interference current into the calculation formula in practice
In the actual measurement of the vast majority of capacitance parameters, a measurement method that does not consider interference is used, resulting in large measurement errors, which cannot meet the actual engineering measurement needs

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
  • Harmonic-component-based anti-interference capacitance measurement method for untransposed transmission line
  • Harmonic-component-based anti-interference capacitance measurement method for untransposed transmission line
  • Harmonic-component-based anti-interference capacitance measurement method for untransposed transmission line

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0037] The technical solution of the present invention will be described in detail below with reference to the drawings and embodiments.

[0038] 1. Non-transposed transmission line capacitance anti-interference measurement based on harmonic components, the embodiment includes the following steps:

[0039] Step 1. Select the measured power failure line a and the nearby live line b.

[0040] See figure 1 As shown, through the step-up transformer (the transformer can saturate under no load), a three-phase power frequency voltage is applied to the head end of the line a to be measured, and the end of the line a is open (the end current is 0). Use the time service function of GPS to obtain a time reference with an error of less than 1 microsecond. Under GPS time synchronization, the embodiment simultaneously collects the three-phase voltage at the head end of line a Three-phase voltage at the end And the three-phase current at the head end And save the measurement data as a file.

[0...

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

The invention discloses a harmonic-component-based anti-interference capacitance measurement method for an untransposed transmission line. Big enough third harmonic is generated in a measurement line through a saturable transformer, a GPS-based synchronous measuring unit is utilized to measure the triphase voltage and the triphase current at the head end and the tail end of the line, and the Hanning windowed FFT interpolation algorithm is adopted to treat the voltage and the current at the head end and the tail end of the line so as to obtain triple harmonic components of the triphase voltage and the triphase current at the head end and the tail end. Meanwhile, in consideration of unequal mutual parameters between two phases of the untransposed transmission line, the harmonic components are utilized to solve the self-admittance and interphase transadmittance parameters of all phases based on a lumped parameter model of the transmission line, and all-sequence capacitance parameters are obtained. The harmonic-component-based anti-interference capacitance measurement method eliminates influence on capacitance measurement of a measured line from power frequency interference of a nearby charged operation line, greatly improves the measurement accuracy and can meet the demands of actual project measurement.

Description

Technical field [0001] The invention relates to a method for accurately measuring capacitance parameters of a transmission line, and the content is a non-transposed transmission line capacitance anti-interference measurement method based on harmonic components. Background technique [0002] Transmission line parameters are important basic data for power flow calculation, power loss calculation, short circuit calculation, fault analysis and relay protection setting calculation in the power system. Without accurate line parameters, the accuracy of the above calculation cannot be guaranteed, which may lead to non-operation or malfunction of the relay protection device and other automatic devices. Therefore, accurately obtaining the parameters of the transmission line is of great significance to the normal operation of the power system. [0003] With the rapid development of the power system in recent years, due to the congestion of transmission corridors and the high construction cos...

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
Patent Type & Authority Applications(China)
IPC IPC(8): G01R27/26
Inventor 胡志坚熊敏
Owner WUHAN UNIV
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products