CN108254650B - Quick judgment method for single-phase earth fault of substation bus - Google Patents
Quick judgment method for single-phase earth fault of substation bus Download PDFInfo
- Publication number
- CN108254650B CN108254650B CN201810336334.4A CN201810336334A CN108254650B CN 108254650 B CN108254650 B CN 108254650B CN 201810336334 A CN201810336334 A CN 201810336334A CN 108254650 B CN108254650 B CN 108254650B
- Authority
- CN
- China
- Prior art keywords
- sequence current
- zero sequence
- feeder line
- feeder
- maximum
- 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.)
- Active
Links
- 238000004364 calculation method Methods 0.000 claims description 6
- 238000000691 measurement method Methods 0.000 claims description 6
- 230000002159 abnormal effect Effects 0.000 claims description 4
- 230000001264 neutralization Effects 0.000 claims description 4
- 238000002955 isolation Methods 0.000 description 2
- 230000004301 light adaptation Effects 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000006011 modification reaction Methods 0.000 description 1
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
- G01R31/50—Testing of electric apparatus, lines, cables or components for short-circuits, continuity, leakage current or incorrect line connections
-
- 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
-
- 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
Abstract
The invention relates to a method for quickly judging single-phase earth fault of a substation bus, which measures I by each feeder zero-sequence current transformer when the single-phase earth fault occurs10、I20…In0、Ij、In，Finding out the feeder line with the maximum zero-sequence current by a zero-sequence current amplitude comparison method, and if the feeder line meets Ijmax0=I10+I20+…+In0+Im0‑Inj0If the value of the maximum zero sequence current in the feeder line is the sum of the zero sequence currents of the other feeder lines except the feeder line and the bus zero sequence current, the feeder line with the maximum zero sequence current is judged to have the single-phase earth fault; if Ijmax0≠I10+I20+…+In0+Im0‑Inj0Namely, the zero sequence current of the feeder line is smaller than the maximum zero sequence current value of the line when the line is in metallic grounding, and then the single-phase grounding fault of the bus of the substation is judged.
Description
Technical Field
The invention belongs to the field of single-phase earth fault processing of a power distribution network, and is mainly used for rapidly judging faults when a bus of a substation has a single-phase earth fault.
Background
When the ground fault processing device is used for processing the single-phase ground fault, the bus of the substation sometimes has the single-phase ground fault, the single-phase ground fault needs to be judged to occur on the bus or a feeder line connected to the bus, and the fault isolation processing can be accurately carried out only by judging whether the single-phase ground fault occurs on the bus of the substation or the feeder line. When a single-phase earth fault occurs, the change of the shift voltage of the bus and the feeder which are connected together at the neutral point of the fault characteristic is the same, so that the fault area is difficult to be quickly judged according to the single-phase earth fault characteristic, and if the fault area cannot be accurately judged, the fault isolation processing cannot be carried out, so that the fault area is quickly judged and the fault processing in time is very necessary when the single-phase earth fault occurs.
Disclosure of Invention
The invention provides a method for quickly judging the single-phase earth fault of a bus of a substation aiming at the problems, and when the neutral point voltage U of the substation is detectedNWhen abnormal, firstly, the zero sequence current I of each feeder line is measured by the zero sequence current mutual inductor of each feeder line10、I20…In0、Ij、In，Finding out the feeder line with the maximum zero-sequence current by a zero-sequence current amplitude comparison method, and if the feeder line meets Ijmax0=I10+I20+…+In0+Im0-Inj0That is, the value of the maximum zero sequence current in the feeder line is the sum of the zero sequence currents of the other feeder lines except the feeder line and the bus zero sequence current, the feeder line occurrence list with the maximum zero sequence current is judgedA phase to ground fault; if Ijmax0≠I10+I20+…+In0+Im0-Inj0And I isjmax0≤Ijzmax0，Ijmax0≤Imax0The zero sequence current of the feeder line with the maximum zero sequence current is smaller than or equal to the maximum zero sequence current value of the feeder line when the feeder line is in metallic grounding, and the zero sequence current of the feeder line with the maximum capacitance current in all the feeder lines of the bus when the feeder line is in metallic grounding is smaller than or equal to the maximum zero sequence current value of the feeder line in the bus when the feeder line is in metallic grounding, the bus of the substation is judged; i ism0Zero sequence current of the bus of the substation to the ground; i isjzmax0The maximum zero sequence current is the maximum zero sequence current when the feeder j is in metallic grounding; i ismax0The zero sequence current value of the feeder line with the maximum capacitance current in all the feeder lines when the feeder lines are in metallic grounding is obtained; i isjmax0The zero sequence current of the feeder line with the largest zero sequence current.
The invention has the following advantages:
the method solves the technical problem of judging the single-phase grounding fault of the bus and the single-phase grounding of the feeder, is convenient for accurately isolating the fault, and prevents the feeder from being cut by mistake in the single-phase grounding fault of the bus.
2. By comparing the mutual relations of the zero sequence currents, the method is simple and rapid, and is convenient for the rapid judgment and processing of the fault.
Detailed Description
The calculated or measured data of the bus-to-ground capacitance current of the substation and the ground capacitance current of each feeder line are stored in a computer controller of the ground fault processing device.
When the voltage transformer detects the zero sequence voltage U of the substationNWhen the abnormal condition occurs, the neutral point voltage U of the substation is detectedNWhen abnormal, firstly, the zero sequence current I of each feeder line is measured by the zero sequence current mutual inductor of each feeder line10、I20…In0、Ij、In，Finding out the feeder line with the maximum zero-sequence current by a zero-sequence current amplitude comparison method, and if the feeder line meets Ijmax0=I10+I20+…+In0+Im0-Inj0That is, the value of the maximum zero sequence current in the feeder line is the sum of the zero sequence currents of the other feeder lines except the feeder line and the bus, the value is judged to be the zero sequence currentAnd (3) processing the feeder line earth fault and further judging the fault property when the feeder line with the largest current has the single-phase earth fault, and if the feeder line with the largest current has the single-phase earth fault, removing the fault line to isolate the fault.
If Ijmax0≠I10+I20+…+In0+Im0-Inj0And I isjmax0≤Ijzmax0，Ijmax0≤Imax0And if the zero-sequence current of the feeder line is small or equal to the maximum zero-sequence current value when the feeder line is in metallic grounding, and the zero-sequence current of the feeder line is small or equal to the maximum zero-sequence current value of the capacitive current in all the feeder lines of the bus when the feeder line is in metallic grounding, the single-phase grounding fault of the bus of the substation is judged, the fault can be processed and the fault property can be judged, and if the fault is judged to be a permanent grounding fault, the fault is alarmed.
Im0The zero sequence current of the bus to the ground of the substation can be obtained by a field actual measurement or calculation method; i isjzmax0The maximum zero sequence current of the line can be obtained by a field actual measurement or calculation method when the feeder j is in metallic grounding; i ismax0The zero sequence current value of the feeder line with the maximum capacitance current in all the feeder lines when the feeder lines are in metallic grounding can be obtained by a field actual measurement or calculation method.
The above description is only a preferred embodiment of the present invention, and the protection scope of the present invention is not limited to the above embodiments, and all technical solutions belonging to the idea of the present invention belong to the protection scope of the present invention. It should be noted that several modifications and adaptations to those skilled in the art without departing from the principles of the present invention should also be considered within the scope of the present invention.
Claims (2)
1. A quick judgment method for single-phase earth fault of a bus of a substation is characterized by comprising the following steps: when the neutral point voltage U of the substation is detectedNWhen abnormal, firstly, the zero sequence current I of each feeder line is measured by the zero sequence current mutual inductor of each feeder line10、I20…In0、Ij、In，Finding out the feeder line with the maximum zero-sequence current by a zero-sequence current amplitude comparison method,if it meets Ijmax0=I10+I20+…+In0+Im0-Inj0If the value of the maximum zero sequence current in the feeder line is the sum of the zero sequence currents of the other feeder lines except the feeder line and the bus zero sequence current, the feeder line with the maximum zero sequence current is judged to have the single-phase earth fault; if Ijmax0≠I10+I20+…+In0+Im0-Inj0And I isjmax0≤Ijzmax0，Ijmax0≤Imax0The zero sequence current of the feeder line with the maximum zero sequence current is smaller than or equal to the maximum zero sequence current value of the feeder line when the feeder line is in metallic grounding, and the zero sequence current of the feeder line with the maximum capacitance current in all the feeder lines of the bus when the feeder line is in metallic grounding is smaller than or equal to the maximum zero sequence current value of the feeder line in the bus when the feeder line is in metallic grounding, the single-phase grounding fault; i ism0Zero sequence current of the bus of the substation to the ground; i isjzmax0The maximum zero sequence current is the maximum zero sequence current when the feeder j is in metallic grounding; i ismax0The zero sequence current value of the feeder line with the maximum capacitance current in all the feeder lines when the feeder lines are in metallic grounding is obtained; i isjmax0The zero sequence current of the feeder line with the largest zero sequence current.
2. The method for rapidly judging the single-phase earth fault of the bus of the substation according to claim 1, characterized in that: i ism0Obtaining the zero sequence current of the bus to the ground of the substation by a field actual measurement or calculation method; i isjzmax0Obtaining the maximum zero sequence current of the line when the feeder j is in metallic grounding by a field actual measurement or calculation method; i ismax0The zero sequence current value of the feeder line with the maximum capacitance current in all the feeder lines when the feeder lines are in metallic grounding is obtained by a field actual measurement or calculation method.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810336334.4A CN108254650B (en) | 2018-04-16 | 2018-04-16 | Quick judgment method for single-phase earth fault of substation bus |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810336334.4A CN108254650B (en) | 2018-04-16 | 2018-04-16 | Quick judgment method for single-phase earth fault of substation bus |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN108254650A CN108254650A (en) | 2018-07-06 |
| CN108254650B true CN108254650B (en) | 2020-09-04 |
Family
ID=62748340
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810336334.4A Active CN108254650B (en) | 2018-04-16 | 2018-04-16 | Quick judgment method for single-phase earth fault of substation bus |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN108254650B (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110221115B (en) * | 2019-07-10 | 2021-07-02 | 山东钢铁股份有限公司 | Method, device and equipment for determining single-phase grounding capacitance current |
| CN113484687A (en) * | 2021-07-22 | 2021-10-08 | 李景禄 | Grounding fault judgment and grounding line selection method for complex power grid |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103728532A (en) * | 2013-12-26 | 2014-04-16 | 长园深瑞继保自动化有限公司 | Power distribution network single-phase grounding fault judging and locating method |
| EP2476002B1 (en) * | 2009-09-09 | 2015-05-27 | Siemens Aktiengesellschaft | Fault detection in energy supply networks having an unearthed or resonant-earthed star point |
| CN205246808U (en) * | 2015-12-11 | 2016-05-18 | 王炳国 | Power cable fault line selection device |
| CN107561406A (en) * | 2017-08-16 | 2018-01-09 | 杭州零尔电力科技有限公司 | It is a kind of based on fault line selection method for single-phase-to-ground fault of the multiterminal than width phase comparing method |
-
2018
- 2018-04-16 CN CN201810336334.4A patent/CN108254650B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP2476002B1 (en) * | 2009-09-09 | 2015-05-27 | Siemens Aktiengesellschaft | Fault detection in energy supply networks having an unearthed or resonant-earthed star point |
| CN103728532A (en) * | 2013-12-26 | 2014-04-16 | 长园深瑞继保自动化有限公司 | Power distribution network single-phase grounding fault judging and locating method |
| CN205246808U (en) * | 2015-12-11 | 2016-05-18 | 王炳国 | Power cable fault line selection device |
| CN107561406A (en) * | 2017-08-16 | 2018-01-09 | 杭州零尔电力科技有限公司 | It is a kind of based on fault line selection method for single-phase-to-ground fault of the multiterminal than width phase comparing method |
Also Published As
| Publication number | Publication date |
|---|---|
| CN108254650A (en) | 2018-07-06 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN106707081B (en) | flexible direct current power distribution network monopole grounding fault identification and fault protection method | |
| EP3266086B1 (en) | Method for protection in a mixed power transmission line | |
| CN108254650B (en) | Quick judgment method for single-phase earth fault of substation bus | |
| US11435409B2 (en) | Temporary overvoltage and ground fault overvoltage protection based on arrester current measurement and analysis | |
| Lin et al. | A selective single-phase-to-ground fault protection for neutral un-effectively grounded systems | |
| CN103364684B (en) | Fault line selection method based on wavelet analysis | |
| Singh et al. | Intelligent techniques for fault diagnosis in transmission lines—An overview | |
| CN106980069B (en) | High-resistance grounding fault positioning method based on transient current projection coefficient difference comparison | |
| CN112578198A (en) | Transient current characteristic-based ship MMC-MVDC rapid fault protection method | |
| CN104090211B (en) | A kind of online test method of distribution line high resistance earthing fault | |
| Pandakov et al. | Misoperation analysis of steady-state and transient methods on earth fault locating in compensated distribution networks | |
| McDonagh et al. | Use of faulted phase earthing using a custom built earth fault controller | |
| CN104062555A (en) | Identification method for distributing line high-resistance ground fault feature harmonic waves | |
| CN110879330B (en) | Power distribution network single-phase earth fault development situation discrimination method based on zero sequence volt-ampere curve area | |
| CN108683157B (en) | Bus grounding intelligent judgment method for transferring grounding processing device | |
| Bhalja et al. | A new digital relaying scheme for parallel transmission line | |
| CN109387731B (en) | High-resistance grounding fault identification method based on wavelet analysis and amplitude comparison | |
| Lin et al. | An adaptive inverse time-delay characteristic of the zero-sequence overvoltage protection for identification of the single-phase earth fault in the neutral non-effectively grounded power systems | |
| CN105098707A (en) | Harmonic impedance protection method for direct-current filter | |
| Prasad et al. | Fault detection and phase selection using Euclidean distance based function for transmission line protection | |
| KR101890035B1 (en) | System for protrecting power system and method for operating the same | |
| Bains et al. | Challenges and recommendations for fault location in series compensated transmission lines | |
| CN110244170B (en) | High-resistance grounding identification method for neutral point ungrounded system | |
| CN112332380B (en) | Intelligent judgment and processing method for multiple earth faults of power distribution network | |
| CN113253044B (en) | Intelligent judgment and processing method for single-phase earth fault in small-resistance earthing mode |
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 | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |