CN110146782A - A kind of ground fault line selecting method - Google Patents
A kind of ground fault line selecting method Download PDFInfo
- Publication number
- CN110146782A CN110146782A CN201910408058.2A CN201910408058A CN110146782A CN 110146782 A CN110146782 A CN 110146782A CN 201910408058 A CN201910408058 A CN 201910408058A CN 110146782 A CN110146782 A CN 110146782A
- Authority
- CN
- China
- Prior art keywords
- zero
- sequence
- fault
- current
- transient
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Classifications
-
- 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
- G01R31/088—Aspects of digital computing
Landscapes
- Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Mathematical Physics (AREA)
- Theoretical Computer Science (AREA)
- General Physics & Mathematics (AREA)
- Testing Of Short-Circuits, Discontinuities, Leakage, Or Incorrect Line Connections (AREA)
Abstract
The present invention relates to grid equipment technical fields, more particularly to a kind of ground fault line selecting method, for earth fault line selection, it include: step S1, judge that ground fault thens follow the steps S2 if low-impedance earthed system failure or middle high resistance earthing fault for low-impedance earthed system failure, middle high resistance earthing fault or high resistance earthing fault, if high resistance earthing fault, S3 is thened follow the steps；Step S2 carries out route selection by the correlation analysis to transient current, transient zero-sequence energy, residual voltage differential and zero-sequence current using zero sequence transient current method；Step S3 carries out route selection by judging that zero-sequence steady state current is different from tested feeder line zero-sequence steady state current phase using zero-sequence steady state current method.The present invention is combined by zero sequence transient current method and zero-sequence steady state current method, and carries out route selection judgement by a variety of judgment methods, is write and is improved ground fault sensing range, improves accuracy, the reliability of fault section location.
Description
Technical field
The present invention relates to a kind of grid equipment technical field more particularly to a kind of ground fault line selecting methods.
Background technique
It is difficult that the ground fault of domestic and international generally existing electric power system power source head end and distribution end " last one kilometer " is handled
Topic, different from power transmission network, the fault resstance of power supply head end and distribution end may be up to tens of k Ω, and troubleshooting is complicated, tired
It is difficult；It may be after the arcing of a few hours, even several months, until fault resstance drops to 1k Ω hereinafter, could be detected and handle.
And the fault signature of ground fault is faint, it is difficult to which, by distribution power automation terminal detection processing, fault section location is difficult.It is existing
A kind of ground fault processing mode of distribution system is increased by being transformed or regulation primary system neutral grounding mode in technology
Zero sequence impedance promotes transient fault blow-out；But after arc extinction, normal voltage is returned, again arcing；The passively electric current
Extinguishing arc mode, it is difficult to inhibit intermittent arc fault, be also easy to produce overvoltage, jeopardize equipment safety.
Summary of the invention
In order to solve the above technical problems, the present invention provides a kind of full compensation systems of ground fault.
Technical problem solved by the invention can be realized using following technical scheme:
A kind of ground fault line selecting method, which is characterized in that including,
Step S1 judges ground fault for low-impedance earthed system failure, middle high resistance earthing fault or high resistance earthing fault, if low
Ground fault or middle high resistance earthing fault are hindered, S2 is thened follow the steps, if high resistance earthing fault, thens follow the steps S3；
Step S2, using zero sequence transient current method, by transient current, transient zero-sequence energy, residual voltage differential with
The correlation analysis of zero-sequence current carries out route selection；
Step S3, using zero-sequence steady state current method, by judging zero-sequence steady state current and tested feeder line zero-sequence steady state current
Phase is different, carries out route selection.
Preferably, zero sequence transient current method described in the step S2 is using first half-wave principle, by close in phase voltage
During maximum value moment single-phase earthing, the first half-wave of single-phase earthing transient fault route transient zero-sequence current a cycle with
The opposite feature of non-fault line carries out route selection.
Preferably, zero sequence transient current method described in the step S2 includes Sudden Changing Rate transient method, utilizes the ground connection event
Barrier occurs previous cycle, the residual voltage and zero-sequence current of the stable state after latter period and failure occurs, and constructs the pure zero sequence of transient state
Fault component, and the transient zero-sequence energy by calculating each route carries out failure line selection.
Preferably, zero-sequence steady state current method described in the step S3 utilizes harmonic principle, and a neutral point is through arc suppression coil
Ground fault system, the arc suppression coil compares the fixation times that the induction reactance that harmonic wave is presented is fundamental wave with route capacitive reactance, described to disappear
Arc coil is similar to open-circuit condition, when the ground fault occurs, is not connect by harmonic capacitive current distribution and the neutral point
The principle that fundamental wave capacity current is distributed in ground system carries out failure line selection.
Preferably, zero-sequence steady state current method described in the step S3 includes zero sequence admittance method, utilizes the arc suppression coil
Automatic tuning process, the zero sequence admittance over the ground when each feedback line of line computation operates normally, when the ground fault occurs
When, the ground resistance of every feedback line of system-computed carries out failure line selection by comparing impedance ground value.
Preferably, zero-sequence steady state current method described in the step S3 further includes zero sequence active component method, by described
Arc suppression coil one resistance of parallel connection, then the electric current of the earth fault line is resistance generation zero-sequence current, and according to zero sequence
The variation of electric current carries out failure line selection.
Preferably, according to the comprehensive characteristics of failure steady state information and fault transient information, by being calculated without adjusting fault line detection
Method carries out comprehensive descision, and merges failure line selection protection by the information of a variety of criterions and carry out failure line selection.
The beneficial effect is that: the present invention is combined by zero sequence transient current method and zero-sequence steady state current method, and is led to
Cross a variety of judgment methods and carry out route selection judgements, write and improve ground fault sensing range, improve fault section location accuracy, can
By property.
Detailed description of the invention
Fig. 1 is ground fault line selecting method logic chart provided by the invention；
Specific embodiment
Following will be combined with the drawings in the embodiments of the present invention, and technical solution in the embodiment of the present invention carries out clear, complete
Site preparation description, it is clear that described embodiments are only a part of the embodiments of the present invention, instead of all the embodiments.It is based on
Embodiment in the present invention, those of ordinary skill in the art without creative labor it is obtained it is all its
His embodiment, shall fall within the protection scope of the present invention.
It should be noted that in the absence of conflict, the feature in embodiment and embodiment in the present invention can phase
Mutually combination.
The present invention will be further explained below with reference to the attached drawings and specific examples, but not as the limitation of the invention.
It is referring to Fig.1 ground fault line selecting method logic chart provided by the invention, comprising:
Step S1 judges ground fault for low-impedance earthed system failure, middle high resistance earthing fault or high resistance earthing fault, if low
Ground fault or middle high resistance earthing fault are hindered, S2 is thened follow the steps, if high resistance earthing fault, thens follow the steps S3；
Step S2, using zero sequence transient current method, by transient current, transient zero-sequence energy, residual voltage differential with
The correlation analysis of zero-sequence current carries out route selection；
Step S3, using zero-sequence steady state current method, by judging zero-sequence steady state current and tested feeder line zero-sequence steady state current
Phase is different, carries out route selection.
Zero sequence transient current method is using first half-wave principle in step S2, by single-phase connecing in phase voltage close to maximum value moment
During ground, the first half-wave of single-phase earthing transient fault route transient zero-sequence current a cycle is opposite with non-fault line
Feature carries out route selection.
Zero sequence transient current method includes Sudden Changing Rate transient method in step S2, and previous cycle occurs using ground fault, occurs
The residual voltage and zero-sequence current of stable state after latter period and failure construct the pure zero-sequence fault component of transient state, and pass through calculating
The transient zero-sequence energy of each route carries out failure line selection.
Zero-sequence steady state current method utilizes harmonic principle in step S3, and a neutral by arc extinction coil grounding failure system disappears
Arc coil compares the fixation times that the induction reactance that harmonic wave is presented is fundamental wave with route capacitive reactance, and arc suppression coil is similar to open-circuit condition, hair
When raw ground fault, pass through the harmonic capacitive current distribution original almost the same with fundamental wave capacity current in isolated neutral system
Reason carries out failure line selection.
In preferred embodiments of the present invention, when singlephase earth fault occurs for system, the perception that arc suppression coil generates is electric
Fault point is arrived in stream compensation, so that faulty line zero-sequence current also advanced residual voltage (usual overcompensation), with non-fault line
Stable status zero-sequence current is equidirectional.
For compensated distribution network since direct-to-ground capacitance is bigger, leakage conductance is usually the 5%~8% of power system capacity
Left and right, when singlephase earth fault occurs: a) watt current of non-fault line is the watt current of route over the ground itself, active
The direction of power flows to route, Po > 0 by bus；B) watt current of faulty line is the watt current of non-fault line and disappears
The direction of the sum of watt current of arc coil, active power flows to bus, Po < 0 by route.
Due to the effect of quintuple harmonics, the induction reactance of arc suppression coil becomes larger, and the capacitive reactance of system power becomes smaller, and the five of faulty line
For subharmonic zero-sequence current close to the sum of the quintuple harmonics zero-sequence current of other non-fault lines, fault signature is obvious.
Further, zero-sequence steady state current method includes zero sequence admittance method in step S3, utilizes the automatic tuning of arc suppression coil
Process, the zero sequence admittance over the ground when each feedback line of line computation operates normally, upon the occurrence of a ground fault, system-computed every
The ground resistance of feedback line carries out failure line selection by comparing impedance ground value.
Further, zero-sequence steady state current method described in step S3 further includes zero sequence active component method, by arc blowout wire
A resistance in parallel is enclosed, then the electric current of earth fault line is that resistance generates zero-sequence current, and carries out according to the variation of zero-sequence current
Failure line selection.
Further, according to the comprehensive characteristics of failure steady state information and fault transient information, by without adjusting fault line detection
Algorithm carries out comprehensive descision, and merges failure line selection protection by the information of a variety of criterions and carry out failure line selection.
The foregoing is merely preferred embodiments of the present invention, are not intended to limit embodiments of the present invention and protection model
It encloses, to those skilled in the art, should can appreciate that all with made by description of the invention and diagramatic content
Equivalent replacement and obviously change obtained scheme, should all be included within the scope of the present invention.
Claims (7)
1. a kind of ground fault line selecting method, which is characterized in that including,
Step S1 judges that ground fault for low-impedance earthed system failure, middle high resistance earthing fault or high resistance earthing fault, connects if low-resistance
Earth fault or middle high resistance earthing fault, then follow the steps S2, if high resistance earthing fault, then follow the steps S3；
Step S2, using zero sequence transient current method, by transient current, transient zero-sequence energy, residual voltage differential and zero sequence
The correlation analysis of electric current carries out route selection；
Step S3, using zero-sequence steady state current method, by judging zero-sequence steady state current and tested feeder line zero-sequence steady state current phase
Difference carries out route selection.
2. a kind of ground fault line selecting method according to claim 1, which is characterized in that zero sequence described in the step S2
Transient current method is using first half-wave principle, by during phase voltage is close to maximum value moment single-phase earthing, single-phase earthing wink
Between the first half-wave feature opposite with non-fault line of faulty line transient zero-sequence current a cycle carry out route selection.
3. a kind of ground fault line selecting method according to claim 1, which is characterized in that zero sequence described in the step S2
Transient current method includes Sudden Changing Rate transient method, after previous cycle occurs, latter period and failure occurs using the ground fault
Stable state residual voltage and zero-sequence current, construct the pure zero-sequence fault component of transient state, and the transient zero-sequence by calculating each route
Energy carries out failure line selection.
4. a kind of ground fault line selecting method according to claim 1, which is characterized in that zero sequence described in the step S3
Steady-state current method utilizes harmonic principle, a neutral by arc extinction coil grounding failure system, and harmonic wave is presented in the arc suppression coil
Induction reactance be that the fixation of fundamental wave times is compared with route capacitive reactance, the arc suppression coil is similar to open-circuit condition, and it is former that the ground connection occurs
When barrier, by the principle of fundamental wave capacity current distribution in harmonic capacitive current distribution and the isolated neutral system, carry out
Failure line selection.
5. a kind of ground fault line selecting method according to claim 4, which is characterized in that zero sequence described in the step S3
Steady-state current method includes zero sequence admittance method, using the automatic tuning process of the arc suppression coil, each feedback line of line computation just
The often zero sequence admittance over the ground when operation, when the ground fault occurs, the ground resistance of every feedback line of system-computed leads to
It crosses and compares impedance ground value progress failure line selection.
6. a kind of ground fault line selecting method according to claim 4, which is characterized in that zero sequence described in the step S3
Steady-state current method further includes zero sequence active component method, by an arc suppression coil resistance in parallel, then the ground fault line
The electric current on road is that the resistance generates zero-sequence current, and carries out failure line selection according to the variation of zero-sequence current.
7. a kind of ground fault line selecting method according to claim 1, which is characterized in that according to failure steady state information and event
The comprehensive characteristics for hindering transient information by carrying out comprehensive descision without adjusting fault line detection algorithm, and pass through the information of a variety of criterions
It merges failure line selection protection and carries out failure line selection.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910408058.2A CN110146782A (en) | 2019-05-15 | 2019-05-15 | A kind of ground fault line selecting method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910408058.2A CN110146782A (en) | 2019-05-15 | 2019-05-15 | A kind of ground fault line selecting method |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN110146782A true CN110146782A (en) | 2019-08-20 |
Family
ID=67594161
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910408058.2A Pending CN110146782A (en) | 2019-05-15 | 2019-05-15 | A kind of ground fault line selecting method |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN110146782A (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110794326A (en) * | 2019-09-26 | 2020-02-14 | 昆明理工大学 | Line selection method, device and system for short-circuit protection of power distribution system |
| CN112698103A (en) * | 2020-12-09 | 2021-04-23 | 国网陕西省电力公司宝鸡供电公司 | Method for improving judgment accuracy of high-transition-resistance ground fault |
| CN112731054A (en) * | 2020-12-19 | 2021-04-30 | 国网河南省电力公司电力科学研究院 | Power distribution network single-phase earth fault line selection method based on zero sequence residual voltage suppression |
| CN113406534A (en) * | 2021-06-15 | 2021-09-17 | 云南拓洲科技有限公司 | Power distribution network airborne line fault simulation experiment system |
-
2019
- 2019-05-15 CN CN201910408058.2A patent/CN110146782A/en active Pending
Non-Patent Citations (4)
| Title |
|---|
| 平绍勋: "《电力系统内部过电压保护及实例分析》", 31 July 2006 * |
| 田书: "基于暂态零序能量的配电网故障选线方法研究", 《工矿自动化》 * |
| 路文梅: "《变电站综合自动化技术》", 31 March 2007 * |
| 陈金玉: "《继电保护》", 30 April 2006, 中国电力出版社 * |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110794326A (en) * | 2019-09-26 | 2020-02-14 | 昆明理工大学 | Line selection method, device and system for short-circuit protection of power distribution system |
| CN112698103A (en) * | 2020-12-09 | 2021-04-23 | 国网陕西省电力公司宝鸡供电公司 | Method for improving judgment accuracy of high-transition-resistance ground fault |
| CN112698103B (en) * | 2020-12-09 | 2022-06-28 | 国网陕西省电力公司宝鸡供电公司 | Method for improving judgment accuracy of high-transition-resistance ground fault |
| CN112731054A (en) * | 2020-12-19 | 2021-04-30 | 国网河南省电力公司电力科学研究院 | Power distribution network single-phase earth fault line selection method based on zero sequence residual voltage suppression |
| CN113406534A (en) * | 2021-06-15 | 2021-09-17 | 云南拓洲科技有限公司 | Power distribution network airborne line fault simulation experiment system |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN110146782A (en) | A kind of ground fault line selecting method | |
| CN101291054B (en) | Diagnosis and protection method for residue current of ground fault in electrical power system | |
| Kundu et al. | Enhanced protection security using the system integrity protection scheme (SIPS) | |
| CN102944813B (en) | Resonant grounding system fault line selection method based on reactive power flow directions | |
| CN102944806B (en) | Zero sequence current polarity comparison-based resonant earthed system line selection method | |
| Azeroual et al. | Fault location and detection techniques in power distribution systems with distributed generation: Kenitra City (Morocco) as a case study | |
| CN103308823A (en) | Method for locating single-phase disconnection non-ground fault of power distribution network | |
| CN109406953A (en) | One kind is suitable for containing with bus loop power distribution network earth fault line selection method | |
| CN103474980A (en) | Transient-power-direction-based single-phase grounding protection method for power distribution network | |
| CN102879704B (en) | Multiparameter data fusion detection method for high resistance ground faults of high-voltage transmission line | |
| CN110879330B (en) | Power distribution network single-phase earth fault development situation discrimination method based on zero sequence volt-ampere curve area | |
| CN107315128A (en) | A kind of distributed earthing wire-selecting method and system based on GOOSE | |
| CN103063984A (en) | Power distribution network single-phase earth fault line selection method based on line double-terminal negative sequence current | |
| CN109975657A (en) | Single-phase ground fault line selecting method of small-electric current grounding system based on differential characteristic value | |
| CN103474974A (en) | Distribution network single-phase ground protection method based on zero-sequence current sudden change straight line fitting direction | |
| CN103326384B (en) | Stable emergency control method based on call wire double-peak track | |
| CN105259480A (en) | Dispatching end small current single-phase grounding wire selection method and system | |
| CN109507532A (en) | A kind of small current neutral grounding system Feeder Section Location | |
| CN115877129B (en) | Low-voltage distribution network neutral line disconnection comprehensive judgment method based on current and voltage | |
| CN106908697A (en) | A kind of synthetic power-frequency and the distribution network fault line selection method in transient reactive power direction | |
| CN110350493A (en) | Middle pressure flexible direct current system fault detection method based on line current second dervative | |
| Wang et al. | Adaptive reclosing strategy for single outgoing line of converter-interfaced wind park using distance relaying algorithm | |
| CN117277246B (en) | Active and passive combined power distribution network ground fault self-adaptive arc extinction method | |
| CN104280663B (en) | A kind of single-phase grounded malfunction in grounded system of low current in-service monitoring and selection method | |
| Liao et al. | Analysis of residual current in low-voltage bipolar DC system and improved residual current protection scheme |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| RJ01 | Rejection of invention patent application after publication | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20190820 |