CN105866619B - Based on distribution parameter zero sequence impedance amplitude characteristic circuit high resistant earth-fault detecting method - Google Patents
Based on distribution parameter zero sequence impedance amplitude characteristic circuit high resistant earth-fault detecting method Download PDFInfo
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- CN105866619B CN105866619B CN201610186614.2A CN201610186614A CN105866619B CN 105866619 B CN105866619 B CN 105866619B CN 201610186614 A CN201610186614 A CN 201610186614A CN 105866619 B CN105866619 B CN 105866619B
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- 230000005611 electricity Effects 0.000 claims abstract description 33
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- 230000001131 transforming effect Effects 0.000 claims abstract description 16
- 230000001681 protective effect Effects 0.000 claims description 11
- 238000005259 measurement Methods 0.000 claims description 5
- 230000001012 protector Effects 0.000 claims description 3
- 230000003247 decreasing effect Effects 0.000 abstract description 3
- 238000001514 detection method Methods 0.000 abstract description 3
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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
- G01R31/08—Locating faults in cables, transmission lines, or networks
- G01R31/081—Locating faults in cables, transmission lines, or networks according to type of conductors
- G01R31/085—Locating faults in cables, transmission lines, or networks according to type of conductors in power transmission or distribution lines, e.g. overhead
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y04—INFORMATION OR COMMUNICATION TECHNOLOGIES HAVING AN IMPACT ON OTHER TECHNOLOGY AREAS
- Y04S—SYSTEMS INTEGRATING TECHNOLOGIES RELATED TO POWER NETWORK OPERATION, COMMUNICATION OR INFORMATION TECHNOLOGIES FOR IMPROVING THE ELECTRICAL POWER GENERATION, TRANSMISSION, DISTRIBUTION, MANAGEMENT OR USAGE, i.e. SMART GRIDS
- Y04S10/00—Systems supporting electrical power generation, transmission or distribution
- Y04S10/50—Systems or methods supporting the power network operation or management, involving a certain degree of interaction with the load-side end user applications
- Y04S10/52—Outage or fault management, e.g. fault detection or location
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Abstract
The invention discloses one kind to be based on distribution parameter zero sequence impedance amplitude characteristic circuit high resistant earth-fault detecting method.This method measures the residual voltage and zero-sequence current at transmission line of electricity both ends first, using the distribution parameter zero sequence impedance of long-line equation calculating Single-phase Ground Connection Failure to m transforming plant protecting installation place, using the distribution parameter zero sequence impedance of long-line equation calculating Single-phase Ground Connection Failure to n transforming plant protecting installation place, then transmission line of electricity single-phase high-impedance detection criteria is constituted from Single-phase Ground Connection Failure to transmission line of electricity both ends this characteristic of monotone decreasing using distribution parameter zero sequence impedance amplitude, action performance is not simultaneously by capacitance current, transition resistance, abort situation, the influence of power system operation mode and load current, the relay protection of entire failure process suitable for transmission line of electricity single-phase high-impedance, transmission line of electricity occurs reliably can correctly act when single-phase high-impedance, Reliability of Microprocessor is high.
Description
Technical field
The present invention relates to Relay Protection Technology in Power System fields, concretely relate to a kind of based on distribution parameter zero sequence
Impedance magnitude characteristic circuit high resistant earth-fault detecting method.
Background technique
Relay protection is as the first line of defence for ensureing power network safety operation, and accurate quick acting is to isolated fault
It is most important with preventing accident from spreading.Traditional back-up protection is constituted based on local electrical quantities, need to be carried out by offline pre-set value
Cooperation, to guarantee the selectivity of protection act.Outstanding problem existing for the mode is that protection seting is complicated, action delay is long,
It is difficult to meet the safety and stability requirement of modern complex electric network.In a wide range of power flow transfer, remote back-up protection is easy chain
Malfunction, and then accelerate mains breakdown.
In recent years, with the development of wide area measurement technology and its in the popularization and application of China Power Grids, China Power Grids are whole
500kV and above substation and the power plant 60MW are assembled with synchronous phasor measurement unit (phase
Measurement unit, PMU), there are also installed PMU, transmission line of electricity both ends for some important load-center substations 330kV, 220kV
Voltage, the magnitude of current can be obtained with synchronous acquisition, to be provided firmly based on both-end synchrodata relay protection of transmission line new method
Part support.Based on both-end synchrodata, Wang Hua, Zhang Zhe and Yin Xianggen et al. deliver " based on false voltage distribution wide area after
Standby protection algorism " it is modeled using lumped parameter, the other side is estimated using the measured value of route side voltage, current failure component
Voltage failure component is constituted Protection criteria with the ratio of estimated value and measured value.This method using lumped parameter because being modeled, principle
On influenced by transmission line of electricity distribution capacity and transition resistance；The algorithm principle and system impedance relating to parameters, action performance by
The influence of power system operation mode and load current is serious.From the point of view of current China Power Grids install PMU situation, there is installing PMU
Substation between transmission line of electricity voltage class it is high, transmission line of electricity voltage, electric current transmission process have apparent wave process, point
Influence of the cloth capacitor to line fault relay protection action performance cannot be ignored.Modern power network operating condition is complicated, system operation
Mode also can not be ignored the influence that line fault identifies.
Summary of the invention
It is an object of the present invention to overcome the deficiencies of the prior art, and to provide what reliably can correctly be acted when a kind of failure
Based on distribution parameter zero sequence impedance amplitude characteristic circuit high resistant earth-fault detecting method.
To complete above-mentioned purpose, the present invention adopts the following technical scheme:
Based on distribution parameter zero sequence impedance amplitude characteristic circuit high resistant earth-fault detecting method, it is characterized by, including
Following sequential steps:
(1) residual voltage of the protector measuring transmission line of electricity in m transforming plant protecting installation placeZero-sequence current
Transmission line of electricity is measured in the residual voltage of n transforming plant protecting installation placeZero-sequence currentWherein, transmission line of electricity connection m becomes
Power station and n substation；
(2) distribution parameter zero sequence impedance of the protective device calculating Single-phase Ground Connection Failure to m transforming plant protecting installation place
Wherein, lmnFor transmission line length；γ0For power transmission line zero-sequence propagation coefficient；Zc0For power transmission line zero-sequence wave resistance
It is anti-；Ch () is hyperbolic cosine function；Sh () is hyperbolic sine function；
(3) distribution parameter zero sequence impedance of the protective device calculating Single-phase Ground Connection Failure to n transforming plant protecting installation place
Wherein, lmnFor transmission line length；γ0For power transmission line zero-sequence propagation coefficient；Zc0For power transmission line zero-sequence wave resistance
It is anti-；Ch () is hyperbolic cosine function；Sh () is hyperbolic sine function；
(4) protective device judgesOr
It is whether true, if so, then protective device judges that single-phase high-impedance occurs for transmission line of electricity, tripping transmission line of electricity both ends
Breaker；Wherein, th () is hyperbolic tangent function.
The present invention compared with prior art, has following positive achievement:
The method of the present invention is dull from Single-phase Ground Connection Failure to transmission line of electricity both ends using distribution parameter zero sequence impedance amplitude
This characteristic of successively decreasing constitutes transmission line of electricity single-phase high-impedance detection criteria, and action performance is not simultaneously by distribution capacity electricity
The influence of stream, transition resistance, abort situation, power system operation mode and load current is suitable for the single-phase high resistant of transmission line of electricity
The relay protection of the entire failure process of ground fault, transmission line of electricity can reliable positive positive motions when occurring single-phase high-impedance
Make, Reliability of Microprocessor is high.
Detailed description of the invention
Fig. 1 is using multi-line power transmission system schematic of the invention.
Specific embodiment
Technical solution of the present invention is expressed in further detail below according to Figure of description.
Fig. 1 is using multi-line power transmission system schematic of the invention.CVT is voltage transformer in Fig. 1, CT is Current Mutual Inductance
Device.Residual voltage of the protector measuring transmission line of electricity in m transforming plant protecting installation placeZero-sequence currentMeasurement transmission of electricity
Residual voltage of the route in n transforming plant protecting installation placeZero-sequence currentWherein, transmission line of electricity connection m substation and n become
Power station.
Protective device calculates Single-phase Ground Connection Failure to the distribution parameter zero sequence impedance of m transforming plant protecting installation place
Wherein, lmnFor transmission line length；γ0For power transmission line zero-sequence propagation coefficient；Zc0For power transmission line zero-sequence wave resistance
It is anti-；Ch () is hyperbolic cosine function；Sh () is hyperbolic sine function.
Protective device calculates Single-phase Ground Connection Failure to the distribution parameter zero sequence impedance of n transforming plant protecting installation place
Wherein, lmnFor transmission line length；γ0For power transmission line zero-sequence propagation coefficient；Zc0For power transmission line zero-sequence wave resistance
It is anti-；Ch () is hyperbolic cosine function；Sh () is hyperbolic sine function.
Distribution parameter zero sequence impedance amplitude is even single-phase to connect from Single-phase Ground Connection Failure to transmission line of electricity both ends monotone decreasing
When earth fault point is between m transforming plant protecting installation place and transmission line of electricity midpoint, then meetIf Single-phase Ground Connection Failure is located at n transforming plant protecting installation place and transmission line of electricity midpoint
Between when, then meetTherefore, the method for the present invention proposes that the single-phase high resistant of transmission line of electricity connects
Earth fault detection criteria is as follows:
JudgementOrIt is whether true,
If so, then protective device judges that single-phase high-impedance, the breaker at tripping transmission line of electricity both ends occur for transmission line of electricity；Its
In, th () is hyperbolic tangent function.
The foregoing is merely preferred embodiments of the invention, but scope of protection of the present invention is not limited thereto, appoint
In the technical scope disclosed by the present invention, any changes or substitutions that can be easily thought of, all by what those familiar with the art
It is covered by the protection scope of the present invention.
Claims (1)
1. being based on distribution parameter zero sequence impedance amplitude characteristic circuit high resistant earth-fault detecting method, which is characterized in that including such as
Lower sequential steps:
(1) residual voltage of the protector measuring transmission line of electricity in m transforming plant protecting installation placeZero-sequence currentMeasurement
Residual voltage of the transmission line of electricity in n transforming plant protecting installation placeZero-sequence currentWherein, transmission line of electricity connects m substation
With n substation；
(2) distribution parameter zero sequence impedance of the protective device calculating Single-phase Ground Connection Failure to m transforming plant protecting installation place
Wherein, lmnFor transmission line length；γ0For power transmission line zero-sequence propagation coefficient；Zc0For power transmission line zero-sequence wave impedance；ch
() is hyperbolic cosine function；Sh () is hyperbolic sine function；
(3) distribution parameter zero sequence impedance of the protective device calculating Single-phase Ground Connection Failure to n transforming plant protecting installation place
(4) protective device judgesOrWhether
It sets up, if there is any one judgement to set up in two, protective device judges that single-phase high-impedance occurs for transmission line of electricity, jumps
Open the breaker at transmission line of electricity both ends；Wherein, th () is hyperbolic tangent function.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111984925B (en) * | 2020-07-29 | 2024-03-12 | 江苏方天电力技术有限公司 | Circuit abnormality positioning method based on loop impedance, storage medium and computing device |
| CN113533907B (en) * | 2021-08-30 | 2023-12-08 | 国网江苏省电力有限公司宿迁供电分公司 | Small-resistance grounding distribution network fault positioning method based on zero-sequence voltage distribution characteristics |
| CN113848389B (en) * | 2021-09-23 | 2023-06-13 | 中国南方电网有限责任公司超高压输电公司广州局 | Zero sequence impedance estimation method and device for cross-coupled transmission line |
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