CN106291221A - A kind of same tower double back transmission line adjacent lines broken string recognition methods - Google Patents

A kind of same tower double back transmission line adjacent lines broken string recognition methods Download PDF

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Publication number
CN106291221A
CN106291221A CN201610918144.4A CN201610918144A CN106291221A CN 106291221 A CN106291221 A CN 106291221A CN 201610918144 A CN201610918144 A CN 201610918144A CN 106291221 A CN106291221 A CN 106291221A
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China
Prior art keywords
zero
transmission line
voltage
sequence
installation place
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CN201610918144.4A
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Chinese (zh)
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CN106291221B (en
Inventor
谢华
赵青春
戴光武
徐晓春
朱晓彤
张洪喜
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Electric Power Research Institute of State Grid Chongqing Electric Power Co Ltd
State Grid Corp of China SGCC
NR Electric Co Ltd
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Electric Power Research Institute of State Grid Chongqing Electric Power Co Ltd
State Grid Corp of China SGCC
NR Electric Co Ltd
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Application filed by Electric Power Research Institute of State Grid Chongqing Electric Power Co Ltd, State Grid Corp of China SGCC, NR Electric Co Ltd filed Critical Electric Power Research Institute of State Grid Chongqing Electric Power Co Ltd
Priority to CN201610918144.4A priority Critical patent/CN106291221B/en
Publication of CN106291221A publication Critical patent/CN106291221A/en
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Publication of CN106291221B publication Critical patent/CN106291221B/en
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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
    • G01R31/50—Testing of electric apparatus, lines, cables or components for short-circuits, continuity, leakage current or incorrect line connections

Abstract

The open a kind of same tower double back transmission line adjacent lines broken string recognition methods of the present invention, comprises the steps: step 1, gathers three-phase current and the three-phase voltage of route protection installation place；Step 2, calculates zero-sequence current and the residual voltage of route protection installation place；Step 3, calculates fictitious zero sequence voltage according to route protection installation place residual voltage, zero-sequence current and power transmission line zero-sequence impedance；Step 4; the residual voltage of alternative route protection installation place and the fictitious zero sequence voltage phase relation of reckoning; if the residual voltage of route protection installation place advanced fictitious zero sequence voltage phase place is close to 180 degree, then judge that the adjacent lines of route protection installation circuit breaks.This kind of method can help in same tower double back transmission line, it is to avoid non-broken string circuit relay protection misoperation.

Description

A kind of same tower double back transmission line adjacent lines broken string recognition methods
Technical field
The invention belongs to field of relay protection in power, particularly to a kind of same tower double back transmission line adjacent lines broken string Recognition methods.
Background technology
Same tower double back transmission line is widely used in supergrid.In heavy current grounding system, with There is the earth-free open conductors that breaks in the loop line in tower double back transmission line, the vertical zero sequence direction of adjacent power circuit is protected When protecting the zero sequence direction measuring method using conventional band residual voltage compensation, it is likely to result in the both sides zero of non-broken string transmission line of electricity Sequence power direction is all judged to positive direction action tripping operation, thus causes power failure range to expand.
Abroad in the line protective devices of some producer, it is configured with the element of circuit breaking monitoring function, but this type of Its basic goal of element is the transmission line of electricity of monitoring broken string, for the most not considering how monitoring in same tower double back transmission line There is the situation of broken string in adjacent lines.Therefore, it is necessary to this problem is furtherd investigate, propose in same tower double back transmission line The method identifying adjacent lines broken string, this case thus produces.
Summary of the invention
The purpose of the present invention, is to provide a kind of same tower double back transmission line adjacent lines broken string recognition methods, and it can help In in same tower double back transmission line, it is to avoid non-broken string circuit relay protection misoperation.
In order to reach above-mentioned purpose, the solution of the present invention is:
A kind of same tower double back transmission line adjacent lines broken string recognition methods, comprises the steps:
Step 1, gathers three-phase current and the three-phase voltage of route protection installation place；
Step 2, calculates zero-sequence current and the residual voltage of route protection installation place；
Step 3, calculates fictitious zero according to route protection installation place residual voltage, zero-sequence current and power transmission line zero-sequence impedance Sequence voltage；
Step 4, the residual voltage of alternative route protection installation place and the fictitious zero sequence voltage phase relation of reckoning, if line The residual voltage advanced fictitious zero sequence voltage phase place of protection installation place, road close to 180 degree, then judges that route protection installs circuit Adjacent lines break.
In above-mentioned steps 2, the computing formula of zero-sequence current is:
3 I · 0 = I · A + I · B + I · C
Wherein,It is the three-phase current of route protection installation place respectively.
In above-mentioned steps 2, the computing formula of residual voltage is:
3 U · 0 = U · A + U · B + U · C
Wherein,It is the three-phase voltage of route protection installation place respectively.
In above-mentioned steps 3, calculate according to route protection installation place residual voltage, zero-sequence current and power transmission line zero-sequence impedance The formula of fictitious zero sequence voltage is:
3 U · 0 ′ = 3 U · 0 - 3 I · 0 Z L 0
Wherein, ZL0For power transmission line zero-sequence impedance,For residual voltage,For zero-sequence current,For virtual zero sequence electricity Pressure.
In above-mentioned steps 4, if meeting:
Then judge that adjacent lines breaks, wherein,Residual voltage for route protection installation place is ahead of void Intend residual voltage angle,For predetermined angle.
After using such scheme, the present invention is according to route protection installation place residual voltage and the phase place of fictitious zero sequence voltage Relation, differentiates whether the adjacent lines of route protection installation circuit breaks exactly, is applied in same tower double back transmission line One loop line broken string, in non-broken string circuit there is the judgement of broken string in adjacent lines, contributes in same tower double back transmission line, it is to avoid non- Broken string circuit relay protection misoperation.
Accompanying drawing explanation
Fig. 1 is the flow chart of the present invention.
Detailed description of the invention
Below with reference to accompanying drawing, technical scheme is described in detail.
As it is shown in figure 1, the present invention provides a kind of same tower double back transmission line adjacent lines broken string recognition methods, including walking as follows Rapid:
Step 1, gathers three-phase current and the three-phase voltage of route protection installation place；
In the present embodiment, if the three-phase current collected is respectivelyThree-phase voltage is respectively
Step 2, calculates zero-sequence current and the residual voltage of route protection installation place；
Concrete, the method for the zero-sequence current and residual voltage that calculate route protection installation place is:
Zero-sequence current:
Residual voltage:
Step 3, calculates fictitious zero according to route protection installation place residual voltage, zero-sequence current and power transmission line zero-sequence impedance Sequence voltage, can calculate according to equation below:
3 U · 0 ′ = 3 U · 0 - 3 I · 0 Z L 0
Wherein, ZL0For power transmission line zero-sequence impedance,For residual voltage,For zero-sequence current,For virtual zero sequence electricity Pressure.
Step 4, the residual voltage of alternative route protection installation place and the fictitious zero sequence voltage phase relation of reckoning, if line The residual voltage advanced fictitious zero sequence voltage phase place of protection installation place, road close to 180 degree, then judges that route protection installs circuit Adjacent lines break.
Wherein, the residual voltage of route protection installation place and the judgement formula of fictitious zero sequence voltage phase relation are:
Wherein,Residual voltage for route protection installation place is ahead of fictitious zero sequence voltage angle,It is one Individual less angle, can be configured as the case may be.
That is:
IfThen judge that adjacent lines breaks；
IfOrThen judge that adjacent lines breaks.
Above example is only the technological thought that the present invention is described, it is impossible to limit protection scope of the present invention with this, every The technological thought proposed according to the present invention, any change done on the basis of technical scheme, each fall within scope Within.

Claims (5)

1. a same tower double back transmission line adjacent lines broken string recognition methods, it is characterised in that comprise the steps:
Step 1, gathers three-phase current and the three-phase voltage of route protection installation place；
Step 2, calculates zero-sequence current and the residual voltage of route protection installation place；
Step 3, calculates virtual zero sequence electricity according to route protection installation place residual voltage, zero-sequence current and power transmission line zero-sequence impedance Pressure；
Step 4, the residual voltage of alternative route protection installation place and the fictitious zero sequence voltage phase relation of reckoning, if circuit is protected Protect the residual voltage advanced fictitious zero sequence voltage phase place of installation place close to 180 degree, then judge that route protection installs the phase of circuit Adjacent line breaks.
2. a kind of same tower double back transmission line adjacent lines broken string recognition methods as claimed in claim 1, it is characterised in that: described In step 2, the computing formula of zero-sequence current is:
3 I · 0 = I · A + I · B + I · C
Wherein,It is the three-phase current of route protection installation place respectively.
3. a kind of same tower double back transmission line adjacent lines broken string recognition methods as claimed in claim 1, it is characterised in that: described In step 2, the computing formula of residual voltage is:
3 U · 0 = U · A + U · B + U · C
Wherein,It is the three-phase voltage of route protection installation place respectively.
4. a kind of same tower double back transmission line adjacent lines broken string recognition methods as claimed in claim 1, it is characterised in that: described In step 3, calculate fictitious zero sequence voltage according to route protection installation place residual voltage, zero-sequence current and power transmission line zero-sequence impedance Formula be:
3 U · 0 ′ = 3 U · 0 - 3 I · 0 Z L 0
Wherein, ZL0For power transmission line zero-sequence impedance,For residual voltage,For zero-sequence current,For fictitious zero sequence voltage.
5. a kind of same tower double back transmission line adjacent lines broken string recognition methods as claimed in claim 1, it is characterised in that: described In step 4, if meeting:
Then judge that adjacent lines breaks, wherein,Residual voltage for route protection installation place is ahead of fictitious zero Sequence voltage angle,For predetermined angle.
CN201610918144.4A 2016-10-20 2016-10-20 A kind of same tower double back transmission line adjacent lines broken string recognition methods Active CN106291221B (en)

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CN106980067A (en) * 2017-04-11 2017-07-25 国网河南省电力公司电力科学研究院 The broken string recognition methods compared based on residual voltage differential values
CN107015113A (en) * 2017-04-11 2017-08-04 国网河南省电力公司电力科学研究院 The power distribution network broken string recognition methods compared is mutated based on forward-order current
CN111025080A (en) * 2019-10-12 2020-04-17 中国电力科学研究院有限公司 Method and system for determining fault line based on station domain information

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Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106980067A (en) * 2017-04-11 2017-07-25 国网河南省电力公司电力科学研究院 The broken string recognition methods compared based on residual voltage differential values
CN107015113A (en) * 2017-04-11 2017-08-04 国网河南省电力公司电力科学研究院 The power distribution network broken string recognition methods compared is mutated based on forward-order current
CN106980067B (en) * 2017-04-11 2019-06-04 国网河南省电力公司电力科学研究院 The broken string recognition methods compared based on residual voltage differential values
CN111025080A (en) * 2019-10-12 2020-04-17 中国电力科学研究院有限公司 Method and system for determining fault line based on station domain information
CN111025080B (en) * 2019-10-12 2022-11-15 中国电力科学研究院有限公司 Method and system for determining fault line based on station domain information

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