Digital high votage parallel reactor longitudinal protection with end braking

A longitudinal difference protection and reactor technology, applied in emergency protection circuit devices, electrical components, etc., can solve the problems that the minimum operating current and the braking slope of the ratio cannot be set too high, and the braking effect is large

Active Publication Date: 2004-12-15
BEIJING SIFANG JIBAO AUTOMATION +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In this way, when an internal fault occurs, the braking effect is very large. In order to ensure the protection sensitivity, the minimum operating current and the ratio braking slope cannot be set too high.

Method used

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  • Digital high votage parallel reactor longitudinal protection with end braking
  • Digital high votage parallel reactor longitudinal protection with end braking
  • Digital high votage parallel reactor longitudinal protection with end braking

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Embodiment Construction

[0015] specific implementation plan

[0016] According to the following formula, the present invention realizes the longitudinal difference protection of the digital high-voltage shunt reactor with terminal braking, and its action characteristics please refer to figure 1 , please refer to the logical relationship between the following formulas figure 2 , the system wiring diagram of the reactor for reference image 3 .

[0017] First, the action equation of the differential quick break is shown in formula (1), where I dz is the operating current, I SD It is the fixed value of the quick breaking current.

[0018] I dz > I SD (1)

[0019] Secondly, the action equation of ratio braking differential protection is shown in formula (2):

[0020]

[0021] Among them: I zd is the braking current, and KID1, KID2, and KID3 are the ratio braking slopes of each section, among which KID1 and KID3 are fixed at 0.2 and 0.7 inside the dev...

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PUM

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Abstract

This invention relates to the longitudinal difference protection for high-voltage parallel reactors in power system, among which, the ratio brake longitudinal difference property is composed of differential quick-break, ratio brake and high-value ratio property. In order to guarantee the protection of correct operation in the transient state process of extra-high voltage and super-high voltage net, this protection has a reactor air detection function, a secondary circuit gap breakage criterion of TA and TA DC saturation criterion so as to make up of a complete end brake digital high voltage parallel reactor longitudinal protection, among which, the ratio brake applies three-section polygon property, the high voltage ratio applies traditional two-section polygon property, the TA secondary circuit gap breakage applies the method of combining zero-sequence current and a phase current and TA DC saturation criterion applies waveform identification theory helped by harmonic wave analysis.

Description

technical field [0001] The invention relates to the field of electric power systems, and more particularly relates to a method for relay protection of high-voltage shunt reactors. Background technique [0002] First, the related art of the present invention is briefly described based on the following references. [0003] 1. He Jiali et al., "UHV Transmission Line Relay Protection Allocation Scheme, Power System Automation", No. 24, 2002 [0004] 2. Wang Weijian, "Principles and Applications of Relay Protection for Electrical Main Equipment", the second edition in January 2002 [0005] 330kV~750kV ultra-high voltage and ultra-high voltage systems have large power transmission capacity and low transmission loss. They have an absolute advantage in long-distance and large-capacity power transmission projects. They are the backbone grid in the power system. Their safe and stable operation is related to the national economy and people's livelihood big event. Different from ordi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02H7/00
Inventor 屠黎明苏毅聂娟红
Owner BEIJING SIFANG JIBAO AUTOMATION
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