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A Transient Protection Method for Transmission Lines Based on Transition Resistance and Fault Initiation Angle

A transition resistance and transmission line technology, applied in emergency protection circuit devices, electrical components, etc., can solve the problems of low reliability, the reduction formula can not adapt to the reduction of high-frequency component processing capacity, and the reduction accuracy needs to be further improved.

Active Publication Date: 2020-02-07
郭振威
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, these transient protection methods do not consider the influence of the transition resistance and the initial angle of the fault on the traveling wave, so there is a problem of low reliability. At the same time, this protection is the same as the traditional protection. A set of protection devices can only protect a line
Chinese invention patent CN2013100656942 (adaptive single-ended transient protection of transmission lines based on transition resistance and fault angle reduction) discloses a transmission line transient protection method based on transition resistance and fault angle, but the reduction formula given by it cannot It is suitable for the reduction calculation of all high-frequency component processing volumes of transmission line faults, and the calculation accuracy needs to be further improved

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  • A Transient Protection Method for Transmission Lines Based on Transition Resistance and Fault Initiation Angle
  • A Transient Protection Method for Transmission Lines Based on Transition Resistance and Fault Initiation Angle
  • A Transient Protection Method for Transmission Lines Based on Transition Resistance and Fault Initiation Angle

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Embodiment Construction

[0092] Figure 1(a) is the grid system model of 500kV EHV transmission line. In this model, the line length of AB section is 180km, the line length of BC section is 342km, the line length of CD section is 360km, the line length of DE section is 266km, and the line length of CG section is 270km. S 1 =35MVA,S 2 =10MVA,S 3 =20MVA,S 4 =5MVA,S 5 = 12 MVA. Line parameter X 1 , R 1 、C 1 、X 0 , R 0 、C 0 Respectively X 1 = 0.2783Ω / km, R 1 = 0.0270Ω / km, C 1 =0.0127μF / km, X 0 = 0.6494Ω / km, R 0 = 0.1948Ω / km, C 0 =0.0090μF / km, the distributed capacitance of each busbar to ground is 6000PF. Assume that a phase-to-ground fault occurs on line CB in Figure 1(a).

[0093] The calculation steps of the fault initial angle in this embodiment are as follows (the embodiment of the present invention is illustrated by collecting the current signal as an example, and the steps of using the voltage signal processing are similar):

[0094] Step 1: Collect the line CB fault current i a ...

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Abstract

The invention discloses a transmission line transient protection method based on transition resistance and a fault initial angle. Conversion is carried out on transient components according to the transition resistance and the fault initial angle, the transient components after conversion are used for constructing a protection criterion, influences on protection by the two can be eliminated to the largest degree, and reliability and sensitivity of protection can be improved greatly. The method of the invention is high in reliability, high in sensitivity and quick in speed. The method of the invention can protect multiple lines at the same time, and investment cost can be greatly reduced; and on the other hand, if each line is equipped with the protection method of the invention, mutual backup can be realized, and protection reliability can be greatly improved again.

Description

technical field [0001] The invention relates to the field of power grid transmission line protection, in particular to a transmission line transient protection method based on transition resistance and fault initial angle. Background technique [0002] At present, protection schemes based on the characteristics of fault power frequency changes are widely used in power systems. The action speed of the whole set of protection is not fast enough (generally takes 20-40ms), and the protection based on power frequency power changes is affected by the distributed capacitive current of high-voltage transmission lines. Influence of factors such as current transformer saturation, power system oscillation and transition resistance. With the increasing scale of the power system, the time required for relay protection to clear the fault is shorter. The protection based on traveling waves generated by line faults proposed in the 1980s has ultra-high-speed action characteristics and is no...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02H7/26
Inventor 郭振威姚建刚
Owner 郭振威
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