CN109038513A - A kind of intelligent processing method of the broken string ground connection for failure phase transfer earthing or grounding means - Google Patents
A kind of intelligent processing method of the broken string ground connection for failure phase transfer earthing or grounding means Download PDFInfo
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- CN109038513A CN109038513A CN201710716976.2A CN201710716976A CN109038513A CN 109038513 A CN109038513 A CN 109038513A CN 201710716976 A CN201710716976 A CN 201710716976A CN 109038513 A CN109038513 A CN 109038513A
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- earthing
- fault
- nmax0
- grounding means
- phase transfer
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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
-
- 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
- G01R31/086—Locating faults in cables, transmission lines, or networks according to type of conductors in power transmission or distribution networks, i.e. with interconnected conductors
Abstract
It is a kind of for failure phase transfer earthing or grounding means broken string ground connection intelligent processing method, in power network neutral point displacement voltage UNStable reaches UN≥UQWhen, then judge whether to meet UN≥UN2, the transfer processing program of ground fault is directly entered if meeting；Such as UN≥UN2, then measure and find out maximum zero-sequence current I in each feeder linenmax0If Inmax0≥I01Into the transfer processing program of ground fault, if not satisfied, the Δ T that is then delayed1Judge I again afterwardsnmax0Whether I is metnmax0≥I01, if satisfied, then entering the transfer processing program of ground fault；If not satisfied, then more whether meeting I againnmax0≥I02, if not satisfied, being then determined as the phase to phase fault that breaks, device issues break alarm signal at this time；If meeting Inmax0≥I01, then be delayed Δ T2Judge whether to meet I again afterwardsnmax0≥I01, the transfer processing program of ground fault is carried out if meeting, if being unsatisfactory for the high resistance earthing fault for being judged to being not suitable for fail-over conditions, device only carries out earthing wire-selecting processing, select earth fault line without failure transfer processing at this time.
Description
Technical field
The present invention is the troubleshooting field of power distribution network single-phase earthing, is mainly used for failure phase transfer earthing or grounding means to distribution
The Intelligent treatment of the complex grounding fault with interruption of net.
Background technique
There are many types for the failure of power distribution network, but mainly have power distribution network single-phase disconnection and the complex grounding fault with interruption, power distribution network hair
When raw asymmetry disconnection fault, the asymmetry of each phase voltage of power distribution network will cause, when especially distribution line head end breaks,
It is asymmetric the most serious.The excessive resistance ground fault as caused by conducting wire landing after if broken string occurs, when excessive resistance value
After reaching certain value, due to asymmetric influence, the judgement rule of ground fault phase is broken, and is connect so that it cannot be appropriately determined
Earth fault phase.Failure phase transfer earthing or grounding means is mainly by finding out ground fault phase, passing through when singlephase earth fault occurs
The correspondence phase earthing switch of device closes a floodgate over the ground, shifts ground fault to carry out troubleshooting, after distribution line broken string
It is grounded asymmetric influence, the judgement rule of ground fault phase is broken, and can not be appropriately determined ground fault phase, and it is wrong to be easy choosing
Phase, it is asymmetric the most serious especially when distribution line head end breaks, it is easiest to select misphase.In distribution line head end
When breaking, device, which selects misphase to close a floodgate over the ground, will cause phase fault, belong near region short trouble, to electric substation, especially
A kind of intelligence maximum, thus that broken string ground connection for failure phase transfer earthing or grounding means must be found is threatened caused by main transformer
Energy processing method, carries out Intelligent treatment when the complex grounding fault with interruption occurs for power distribution network.
Summary of the invention
In view of the above-mentioned problems, having invented a kind of Intelligent treatment side of broken string ground connection for failure phase transfer earthing or grounding means
Method, in power network neutral point displacement voltage UNStable reaches UN≥UQWhen, then judge whether to meet UN≥UN2, straight if meeting
Tap into the transfer processing program into ground fault；Such as UN≥UN2, then measure and find out maximum zero-sequence current I in each feeder linenmax0,
If Inmax0≥I01Into the transfer processing program of ground fault, if not satisfied, the Δ T that is then delayed1Judge I again afterwardsnmax0Whether meet
Inmax0≥I01, if satisfied, then entering the transfer processing program of ground fault；If not satisfied, then more whether meeting I againnmax0≥
I02, if not satisfied, being then determined as the phase to phase fault that breaks, device issues break alarm signal at this time；If meeting Inmax0≥I01,
Then be delayed Δ T2Judge whether to meet I again afterwardsnmax0≥I01, the transfer processing program of ground fault is carried out if meeting, if discontented
High resistance earthing fault that is sufficient then being judged to being not suitable for fail-over conditions, device is only carried out without failure transfer processing at this time
Earthing wire-selecting is handled, and maximum zero-sequence current I occurs in each feeder linenmax0Route be earth fault line.
UQFor the fault initiating voltage of failure phase transfer earthing or grounding means, different failure phase transfer earthing or grounding means can be carried out not
Same setting, but should be greater than the maximum neutral point displacement voltage of isolated neutral system power grid permission, UQ>UФ5%, UФIt is mutually electric for power grid
Pressure. UN2For the maximum feeder line of zero-sequence current in power grid head end break when caused by neutral point displacement voltage, can by calculate or
The method of field measurement obtains.
I01Minimum earth current when high resistance earthing fault, i.e. earth-fault current are handled for failure phase transfer earthing or grounding means
Failure phase transfer earthing or grounding means correctly can carry out transfer processing, different failure phase transfers to ground fault when reaching the value
Earthing or grounding means has different minimum earth currents.I02When the high resistance ground that can reliably detect for failure phase transfer earthing or grounding means
Zero-sequence current, the electric current are less than minimum earth current I when failure phase transfer earthing or grounding means processing high resistance earthing fault01, connecing
Earth fault electric current is I02When, failure phase transfer earthing or grounding means cannot carry out transfer processing to ground fault, can only carry out ground connection choosing
Line can be selected by the method for route selection and cut off faulty line.I02It should be greater than generating most in feeder line when route head end broken string
Big zero-sequence current.
ΔT1The maximum duration landed from broken string to conducting wire for power distribution network；ΔT2By unstable ground connection after being landed for conducting wire
Develop to the time of quiet earth.
The present invention has an advantage that
1, the present invention solves the key technology that failure phase transfer earthing or grounding means selects misphase in processing power distribution network the complex grounding fault with interruption
Problem, that is, solve the problems, such as that can failure phase transfer earthing or grounding means use in power grid security.
2, the intelligent processing method of present invention application broken string ground connection, solves power distribution network broken line fault and the complex grounding fault with interruption
Accurate judgement prevent error action of device from causing near region short circuit accident, so that fault spread is jeopardized equipment safety.
3, the present invention according to the active development of power distribution network the complex grounding fault with interruption point ground resistance and the differentiation of earth fault at
Reason method solves the processing problem of high resistance ground.
Detailed description of the invention
Fig. 1 is the logic chart of the intelligent processing method of the broken string ground connection of failure phase transfer earthing or grounding means.
Specific embodiment
When using failure phase transfer earthing or grounding means processing one-phase earthing failure in electric distribution network, electricity is displaced in power network neutral point
Press UNStable reaches UN≥UQWhen, then judge whether to meet UN≥UN2, the transfer processing of ground fault is directly entered if meeting
Program；Such as UN≥UN2, then measure and find out maximum zero-sequence current I in each feeder linenmax0If Inmax0≥I01Into ground fault
Transfer processing program, if not satisfied, the Δ T that is then delayed1Judge I again afterwardsnmax0Whether I is metnmax0≥I01, if satisfied, then entering
The transfer processing program of ground fault；If not satisfied, then more whether meeting I againnmax0≥I02, if not satisfied, being then judged to breaking
Line phase to phase fault, device issues break alarm signal at this time；If meeting Inmax0≥I01, then be delayed Δ T2Judge whether again afterwards full
Sufficient Inmax0≥I01, the transfer processing program of ground fault is carried out if meeting, if being unsatisfactory for being judged to being not suitable for failure transfer
The high resistance earthing fault of condition, device only carries out earthing wire-selecting processing, occurs in each feeder line without failure transfer processing at this time
Maximum zero-sequence current Inmax0Route be earth fault line.
UQFor the fault initiating voltage of failure phase transfer earthing or grounding means, different failure phase transfer earthing or grounding means can be carried out not
Same setting, but should be greater than the maximum neutral point displacement voltage of isolated neutral system power grid permission, UQ>UФ5%, UФIt is mutually electric for power grid
Pressure. UN2For the maximum feeder line of zero-sequence current in power grid head end break when caused by neutral point displacement voltage, can by calculate or
The method of field measurement obtains.
I01Minimum earth current when high resistance earthing fault, i.e. earth-fault current are handled for failure phase transfer earthing or grounding means
Failure phase transfer earthing or grounding means correctly can carry out transfer processing, different failure phase transfers to ground fault when reaching the value
Earthing or grounding means has different minimum earth currents.I02When the high resistance ground that can reliably detect for failure phase transfer earthing or grounding means
Zero-sequence current, the electric current are less than minimum earth current I when failure phase transfer earthing or grounding means processing high resistance earthing fault01, connecing
Earth fault electric current is I02When, failure phase transfer earthing or grounding means cannot carry out transfer processing to ground fault, can only carry out ground connection choosing
Line can be selected by the method for route selection and cut off faulty line.I02It should be greater than generating most in feeder line when route head end broken string
Big zero-sequence current.
ΔT1The maximum duration landed from broken string to conducting wire for power distribution network；ΔT2By unstable ground connection after being landed for conducting wire
Develop to the time of quiet earth.
The above is only a preferred embodiment of the present invention, protection scope of the present invention is not limited merely to above-mentioned implementation
Example, all technical solutions belonged under thinking of the present invention all belong to the scope of protection of the present invention.It should be pointed out that for the art
Those of ordinary skill for, several improvements and modifications without departing from the principles of the present invention also should be regarded as guarantor of the invention
Protect range.
Claims (6)
1. a kind of intelligent processing method of the broken string ground connection for failure phase transfer earthing or grounding means, it is characterised in that: in power distribution network
Neutral point displacement voltage UNStable reaches UN≥UQWhen, then judge whether to meet UN≥UN2, ground connection event is directly entered if meeting
The transfer processing program of barrier；Such as UN≥UN2, then measure and find out maximum zero-sequence current I in each feeder linenmax0If Inmax0≥I01
Into the transfer processing program of ground fault, if not satisfied, the Δ T that is then delayed1Judge I again afterwardsnmax0Whether I is metnmax0≥I01,
If satisfied, then entering the transfer processing program of ground fault；If not satisfied, then more whether meeting I againnmax0≥I02If discontented
Foot, then be determined as the phase to phase fault that breaks, and device issues break alarm signal at this time；If meeting Inmax0≥I01, then be delayed Δ T2
Judge whether to meet I again afterwardsnmax0≥I01, the transfer processing program of ground fault is carried out if meeting, if being unsatisfactory for being determined as
Be not suitable for the high resistance earthing fault of fail-over conditions, device only carries out at earthing wire-selecting without failure transfer processing at this time
It manages, maximum zero-sequence current I occurs in each feeder linenmax0Route be earth fault line.
2. a kind of intelligent processing method of broken string ground connection for failure phase transfer earthing or grounding means according to claim 1,
It is characterized by: UQFor the fault initiating voltage of failure phase transfer earthing or grounding means, different failure phase transfer earthing or grounding means can be into
The different setting of row, but should be greater than the maximum neutral point displacement voltage of isolated neutral system power grid permission, UQ>UФ5%, UФFor power grid
Phase voltage.
3. a kind of intelligent processing method of broken string ground connection for failure phase transfer earthing or grounding means according to claim 1,
It is characterized by: UN2For the maximum feeder line of zero-sequence current in power grid head end break when caused by neutral point displacement voltage, can lead to
The method for crossing calculating or field measurement obtains.
4. a kind of intelligent processing method of broken string ground connection for failure phase transfer earthing or grounding means according to claim 1,
It is characterized by: I01Minimum earth current when high resistance earthing fault, i.e. ground fault are handled for failure phase transfer earthing or grounding means
Failure phase transfer earthing or grounding means correctly can carry out transfer processing, different failure phases to ground fault when electric current reaches the value
Transfer earthing or grounding means has different minimum earth currents.
5. a kind of intelligent processing method of broken string ground connection for failure phase transfer earthing or grounding means according to claim 1,
It is characterized by: I02The zero-sequence current when high resistance ground that can reliably detect for failure phase transfer earthing or grounding means, the electric current are small
Minimum earth current I when failure phase transfer earthing or grounding means handles high resistance earthing fault01, it is I in earth-fault current02When,
Failure phase transfer earthing or grounding means cannot carry out transfer processing to ground fault, can only carry out earthing wire-selecting, can pass through the side of route selection
Faulty line, I are selected and cut off to method02It should be greater than the maximum zero sequence current generated in feeder line when route head end broken string.
6. a kind of intelligent processing method of broken string ground connection for failure phase transfer earthing or grounding means according to claim 1,
It is characterized by: Δ T1The maximum duration landed from broken string to conducting wire for power distribution network；ΔT2To be connect after conducting wire landing by unstable
Develop to the time of quiet earth in ground.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201710716976.2A CN109038513B (en) | 2017-08-21 | 2017-08-21 | A kind of intelligent processing method of the broken string ground connection for failure phase transfer earthing or grounding means |
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| CN201710716976.2A CN109038513B (en) | 2017-08-21 | 2017-08-21 | A kind of intelligent processing method of the broken string ground connection for failure phase transfer earthing or grounding means |
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| CN109038513A true CN109038513A (en) | 2018-12-18 |
| CN109038513B CN109038513B (en) | 2019-09-10 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110098600A (en) * | 2019-05-08 | 2019-08-06 | 天津大学 | A kind of cable monopolar grounding fault guard method based on line capacitance transfer charge |
| CN111929531A (en) * | 2020-07-20 | 2020-11-13 | 南方电网科学研究院有限责任公司 | Power distribution network fault section positioning method and system based on ground fault transfer |
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| CN1355585A (en) * | 2000-10-20 | 2002-06-26 | 施魏策尔工程实验公司 | Failure type selecting system for identificating failure in electric system |
| CN102231517A (en) * | 2011-06-09 | 2011-11-02 | 航天科工深圳（集团）有限公司 | Method and system for determining and isolating power distribution network fault |
| CN106872852A (en) * | 2017-01-13 | 2017-06-20 | 济南大学 | The multiple fault type diagnostic method of power distribution network single-phase disconnection ground connection based on residual voltage |
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2017
- 2017-08-21 CN CN201710716976.2A patent/CN109038513B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN1355585A (en) * | 2000-10-20 | 2002-06-26 | 施魏策尔工程实验公司 | Failure type selecting system for identificating failure in electric system |
| CN102231517A (en) * | 2011-06-09 | 2011-11-02 | 航天科工深圳（集团）有限公司 | Method and system for determining and isolating power distribution network fault |
| CN106872852A (en) * | 2017-01-13 | 2017-06-20 | 济南大学 | The multiple fault type diagnostic method of power distribution network single-phase disconnection ground connection based on residual voltage |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110098600A (en) * | 2019-05-08 | 2019-08-06 | 天津大学 | A kind of cable monopolar grounding fault guard method based on line capacitance transfer charge |
| CN110098600B (en) * | 2019-05-08 | 2021-02-26 | 天津大学 | Cable single-pole ground fault protection method based on line capacitance transferred charge |
| CN111929531A (en) * | 2020-07-20 | 2020-11-13 | 南方电网科学研究院有限责任公司 | Power distribution network fault section positioning method and system based on ground fault transfer |
| CN111929531B (en) * | 2020-07-20 | 2021-07-27 | 南方电网科学研究院有限责任公司 | Power distribution network fault section positioning method and system based on ground fault transfer |
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| CN109038513B (en) | 2019-09-10 |
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