CN105762774A - Line ground fault phase selection method using sequence current phase characteristic and sequence voltage phase characteristic - Google Patents
Line ground fault phase selection method using sequence current phase characteristic and sequence voltage phase characteristic Download PDFInfo
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- CN105762774A CN105762774A CN201610184728.3A CN201610184728A CN105762774A CN 105762774 A CN105762774 A CN 105762774A CN 201610184728 A CN201610184728 A CN 201610184728A CN 105762774 A CN105762774 A CN 105762774A
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- phase
- fault
- protection device
- transmission line
- short circuit
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
- H02H7/26—Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occured
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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
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Emergency Protection Circuit Devices (AREA)
- Locating Faults (AREA)
Abstract
The invention discloses a line ground fault phase selection method using a sequence current phase characteristic and a sequence voltage phase characteristic. The method is characterized by forming a criterion by using a phase relation between zero-sequence voltage and phase-A negative-sequence voltage to accurately determine whether a power transmission line fault is a grounding short circuit fault; and forming a criterion by using a phase relation between zero-sequence current and phase-A positive-sequence current sudden change to distinguish between a single-phase grounding short circuit fault and a two-phase grounding short circuit fault. If a power transmission line is subjected to a high resistance grounding short circuit fault when a weak power side and a system operation mode are changed a lot, the method has high phase selection sensitivity, may accurately determine a specific grounding fault phase, and may provide correct and reliable fault phase information for distance protection and an automatic reclosing correct action.
Description
Technical field
The present invention relates to Relay Protection Technology in Power System field, concretely relate to one and utilize sequence current phase characteristic and sequence voltage phase characteristic to realize line-to-ground fault phase-selecting method.
Background technology
Power transmission line fault phase selection mainly includes difference of phase currents phase selection, phase voltage Sudden Changing Rate phase selection and the comprehensive phase-selecting method of voltage x current Sudden Changing Rate.At light current source, difference of phase currents phase selection insufficient sensitivity is high；At forceful electric power source, phase voltage Sudden Changing Rate phase selection sensitivity Shortcomings；Although the comprehensive phase-selecting method of voltage x current Sudden Changing Rate all has better phase selection sensitivity at light current source and forceful electric power source, but in three phase short circuit fault phase selection and high resistance ground short trouble sensitivity Shortcomings.
Transmission line malfunction phase selection correctness is related to that the correct operation of transmission line distance protecting and auto recloser is whether; reinforcement relay protection of transmission line action correctness and reliability had particularly significant impact; therefore, study a kind of under light current source and system operation mode generation large change situation, all there is sufficiently high phase selection sensitivity, the transmission lines earth fault phase-selecting method tool that can accurately distinguish single-phase grounding fault and two-phase short circuit and ground fault is of great significance.
Summary of the invention
It is an object of the invention to the deficiency overcoming prior art to exist, it is provided that a kind of under light current source and system operation mode generation large change situation, all there is sufficiently high phase selection sensitivity, single-phase grounding fault can be accurately distinguished and utilize sequence current phase characteristic and the sequence voltage phase characteristic of two-phase short circuit and ground fault realize line-to-ground fault phase-selecting method.
For completing above-mentioned purpose, the present invention adopts the following technical scheme that
Utilizing sequence current phase characteristic and sequence voltage phase characteristic to realize line-to-ground fault phase-selecting method, it is characterized by, and comprises the following steps that
(1) residual voltage of protector measuring line protection installation placeZero-sequence currentA phase negative sequence voltageWith A phase forward-order current Sudden Changing Rate
(2) protection device judgesAndWhether set up, if setting up, then protection device is judged as A phase transmission line of electricity single phase ground fault fault；
(3) protection device judgesAndWhether set up, if setting up, then protection device is judged as BC phase transmission line of electricity generation ground short circuit fault；
(4) protection device judgesAndWhether set up, if setting up, then protection device is judged as B phase transmission line of electricity single phase ground fault fault；
(5) protection device judgesAndWhether set up, if setting up, then protection device is judged as CA phase transmission line of electricity generation ground short circuit fault；
(6) protection device judgesAndWhether set up, if setting up, then protection device is judged as C phase transmission line of electricity single phase ground fault fault；
(7) protection device judgesAndWhether set up, if setting up, then protection device is judged as AB phase transmission line of electricity generation ground short circuit fault.
The present invention compared with prior art, has following positive achievement:
The inventive method constitutes criterion first with the phase relation between residual voltage with A phase negative sequence voltage, to whether transmission line malfunction is that ground short circuit fault accurately judges, then utilizes the phase relation between zero-sequence current and A phase forward-order current Sudden Changing Rate to constitute criterion and distinguish single-phase grounding fault and two-phase short circuit and ground fault.Under light current source and system operation mode generation large change situation during transmission line of electricity generation high resistance ground short trouble; the inventive method all has sufficiently high phase selection sensitivity; concrete earth fault phase can be accurately judged to, correct fault phase information reliably can be provided for distance protection and automatic reclosing correct operation.
Accompanying drawing explanation
Fig. 1 is the multi-line power transmission system schematic of the application present invention.
Detailed description of the invention
Below according to Figure of description, technical scheme is expressed in further detail.
Fig. 1 is the multi-line power transmission system schematic of the application present invention.In Fig. 1, CVT is voltage transformer, CT is current transformer.The current waveform of the potential and current transformers CT of the voltage transformer CVT of line protection installation place is carried out sampling and obtains voltage, current instantaneous value by protection device, and voltage, current instantaneous value that then it is collected by protection device utilize Fourier algorithm computing electric power line to protect the residual voltage of installation placeZero-sequence currentA phase negative sequence voltageWith A phase forward-order current Sudden Changing Rate
Protection device judgesAndWhether set up, if setting up, then protection device is judged as A phase transmission line of electricity single phase ground fault fault.
Protection device judgesAndWhether set up, if setting up, then protection device is judged as BC phase transmission line of electricity generation ground short circuit fault.
Protection device judgesAndWhether set up, if setting up, then protection device is judged as B phase transmission line of electricity single phase ground fault fault.
Protection device judgesAndWhether set up, if setting up, then protection device is judged as CA phase transmission line of electricity generation ground short circuit fault.
Protection device judgesAndWhether set up, if setting up, then protection device is judged as C phase transmission line of electricity single phase ground fault fault.
Protection device judgesAndWhether set up, if setting up, then protection device is judged as AB phase transmission line of electricity generation ground short circuit fault.
The inventive method constitutes criterion first with the phase relation between residual voltage with A phase negative sequence voltage, to whether transmission line malfunction is that ground short circuit fault accurately judges, then utilizes the phase relation between zero-sequence current and A phase forward-order current Sudden Changing Rate to constitute criterion and distinguish single-phase grounding fault and two-phase short circuit and ground fault.Under light current source and system operation mode generation large change situation during transmission line of electricity generation high resistance ground short trouble; the inventive method all has sufficiently high phase selection sensitivity; concrete earth fault phase can be accurately judged to, correct fault phase information reliably can be provided for distance protection and automatic reclosing correct operation.
The foregoing is only the preferred embodiment of the present invention; but protection scope of the present invention is not limited thereto; any those familiar with the art in the technical scope that the invention discloses, the change that can readily occur in or replacement, all should be encompassed within protection scope of the present invention.
Claims (1)
1. utilize sequence current phase characteristic and sequence voltage phase characteristic to realize line-to-ground fault phase-selecting method, it is characterised in that to comprise the steps:
(1) residual voltage of protector measuring line protection installation placeZero-sequence currentA phase negative sequence voltageWith A phase forward-order current Sudden Changing Rate
(2) protection device judgesAndWhether set up, if setting up, then protection device is judged as A phase transmission line of electricity single phase ground fault fault；
(3) protection device judgesAndWhether set up, if setting up, then protection device is judged as BC phase transmission line of electricity generation ground short circuit fault；
(4) protection device judgesAndWhether set up, if setting up, then protection device is judged as B phase transmission line of electricity single phase ground fault fault；
(5) protection device judgesAndWhether set up, if setting up, then protection device is judged as CA phase transmission line of electricity generation ground short circuit fault；
(6) protection device judgesAndWhether set up, if setting up, then protection device is judged as C phase transmission line of electricity single phase ground fault fault；
(7) protection device judgesAndWhether set up, if setting up, then protection device is judged as AB phase transmission line of electricity generation ground short circuit fault.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610184728.3A CN105762774B (en) | 2016-03-29 | 2016-03-29 | Line-to-ground fault phase-selecting method is realized using sequence current phase characteristic and sequence voltage phase characteristic |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610184728.3A CN105762774B (en) | 2016-03-29 | 2016-03-29 | Line-to-ground fault phase-selecting method is realized using sequence current phase characteristic and sequence voltage phase characteristic |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN105762774A true CN105762774A (en) | 2016-07-13 |
| CN105762774B CN105762774B (en) | 2018-09-25 |
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| CN201610184728.3A Active CN105762774B (en) | 2016-03-29 | 2016-03-29 | Line-to-ground fault phase-selecting method is realized using sequence current phase characteristic and sequence voltage phase characteristic |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107255765A (en) * | 2017-05-11 | 2017-10-17 | 西安交通大学 | The resonant earthed system singlephase earth fault Section Location of comprehensive high frequency and power frequency zero-sequence component phase property |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1440102A (en) * | 2003-01-09 | 2003-09-03 | 西安交通大学 | High voltage circuit phase selection based on pallern identification |
| CN103207346A (en) * | 2013-03-13 | 2013-07-17 | 福建省电力有限公司 | Power transmission line fault phase selection method |
| CN103227455A (en) * | 2013-04-15 | 2013-07-31 | 国家电网公司 | Single-phase line earth fault relay protection method based on fault impedance phase characteristic |
| CN103368151A (en) * | 2013-06-18 | 2013-10-23 | 国家电网公司 | Method of realizing line-to-ground fault phase selection by using sequence voltage phase characteristic |
| CN104267311A (en) * | 2014-09-12 | 2015-01-07 | 广东电网公司电力科学研究院 | Phase selection method for faults of double-circuit lines on same tower |
-
2016
- 2016-03-29 CN CN201610184728.3A patent/CN105762774B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1440102A (en) * | 2003-01-09 | 2003-09-03 | 西安交通大学 | High voltage circuit phase selection based on pallern identification |
| CN103207346A (en) * | 2013-03-13 | 2013-07-17 | 福建省电力有限公司 | Power transmission line fault phase selection method |
| CN103227455A (en) * | 2013-04-15 | 2013-07-31 | 国家电网公司 | Single-phase line earth fault relay protection method based on fault impedance phase characteristic |
| CN103368151A (en) * | 2013-06-18 | 2013-10-23 | 国家电网公司 | Method of realizing line-to-ground fault phase selection by using sequence voltage phase characteristic |
| CN104267311A (en) * | 2014-09-12 | 2015-01-07 | 广东电网公司电力科学研究院 | Phase selection method for faults of double-circuit lines on same tower |
Non-Patent Citations (1)
| Title |
|---|
| 张海等: "第7期", 《中国电机工程学报》 * |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107255765A (en) * | 2017-05-11 | 2017-10-17 | 西安交通大学 | The resonant earthed system singlephase earth fault Section Location of comprehensive high frequency and power frequency zero-sequence component phase property |
| CN107255765B (en) * | 2017-05-11 | 2019-06-11 | 西安交通大学 | A kind of resonant earthed system singlephase earth fault Section Location |
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| Publication number | Publication date |
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| CN105762774B (en) | 2018-09-25 |
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