CN103219721A - Automatic integrated processing method for single-phase earth fault - Google Patents
Automatic integrated processing method for single-phase earth fault Download PDFInfo
- Publication number
- CN103219721A CN103219721A CN2013101390058A CN201310139005A CN103219721A CN 103219721 A CN103219721 A CN 103219721A CN 2013101390058 A CN2013101390058 A CN 2013101390058A CN 201310139005 A CN201310139005 A CN 201310139005A CN 103219721 A CN103219721 A CN 103219721A
- Authority
- CN
- China
- Prior art keywords
- earth fault
- processing method
- fault
- small resistor
- single phase
- 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
Landscapes
- Emergency Protection Circuit Devices (AREA)
Abstract
The invention provides an automatic integrated processing method for a single-phase earth fault, and belongs to the field of emergency protective devices. The automatic integrated processing method for the single-phase earth fault comprises the steps: S1, a controllable electric reactor and a small resistor are arranged on a earth connection return circuit of a converting station, the controllable electric reactor outputs a compensating current when a power distribution network has an earth fault; S2, lasting time of the single-phase earth fault is measured and recorded; S3, the single-phase earth fault is confirmed to be instant grounding when the lasting time of the single-phase earth fault is shorter than preset time; S4, the single-phase earth fault is confirmed to be permanent grounding when the lasting time of the single-phase earth fault is longer than the preset time; and S5, a first treatment measure and a second treatment measure are conducted to the instant grounding and the permanent grounding respectively. Therefore, the permanent earth fault is isolated quickly and accurately, expansion of an accident caused by the fact that overvoltage of power frequency of a system exists for long time is avoided, instant earth fault is compensated accurately and disappears automatically, tripping operation is not needed, and the safety and reliability of the system are improved. Further, the automatic one-in-all processing method for the single-phase earth fault can be widely used in the field of converting station system protection.
Description
Technical field
The invention belongs to transformer station emergency protective device field, relate in particular to a kind of processing method that is used for single phase ground fault.
Background technology
The selection of neutral grounding in distribution power network and power system security and operational reliability, economy are closely related, are the problems that must pay close attention in the city net and the extension of rural power grids.
The selection of earthing mode should be considered the structure and the equipment of power distribution network at that time, also is subjected to the restriction of grounding apparatus technical merit.
At present, neutral grounding in distribution power network has grounding through arc and two kinds of patterns of low resistance grounding, two kinds of patterns respectively have pluses and minuses, wherein: the grounding through arc mode can reduce earth current, lower the probability that the arc light overvoltage takes place, but shortcoming is the ground connection overlong time, and system's power frequency overvoltage long-term existence is difficult to the isolated fault circuit; The low resistance grounding mode is by producing big current signal, and energy is the tripping faulty line accurately, but it is to instantaneity earth fault and permanent earth fault consistently practise tripping operation, and the trip-out rate height has reduced system's power supply reliability.
The grounding through arc mode can be eliminated the instantaneity single phase ground fault automatically, has the advantage that reduces the tripping operation number of times, reduces earth fault current, but owing to can not excise non-instantaneity single phase ground fault, whole distribution system must be born the long period power-frequency overvoltage (line voltage) of (2 hours), therefore the insulation level to equipment requires high, this is disadvantageous to power distribution system equipment (especially for some import equipment, as cable); The long-time existence of single phase ground fault simultaneously also is unfavorable for equipment and personal safety.And the failure line selection of traditional arc suppression coil earthing system the inside, be a technical barrier always.The actual route selection accuracy rate of distribution for many years is lower, utilizes the method manually draw the road to go to seek and gets rid of earth fault, takes time and effort, and efficient is low even also make mistakes in chaos, and influences equipment and personal safety.
The low resistance grounding mode can avoid distribution system the problem of long-time power-frequency overvoltage to occur, to apparatus insulated require relatively low, weak point is that any single phase ground fault all trips in the system, especially for built on stilts too high with the cable hybrid line trip-out rate, has reduced power supply reliability.
Therefore, these two kinds of earthing modes all cut both ways, and can only be applicable to certain condition.Especially along with the capacity of north, Shanghai City electric company power distribution network is increasing, more and more higher, higher to the person and safety equipment requirement to the reliability requirement of power distribution network, press for and seek a kind of more perfect earthing mode.
Summary of the invention
Technical problem to be solved by this invention provides a kind of automatic integratedization processing method of single phase ground fault, it integrates consideration with controlled reactor and two kinds of grounding apparatuss of small resistor, transient earthing in the single-phase earthing and permanent earth distinguished treat, take different measures respectively, avoided the drawback of original single tupe, both guaranteed accurately isolating rapidly to permanent earth fault, avoid system's power frequency overvoltage long-term existence to cause accident further to enlarge, can carry out fine compensation to instantaneity earth fault again dies away it, need not tripping operation, improved the fail safe and the reliability of system.
Technical scheme of the present invention is: a kind of automatic integratedization processing method of single phase ground fault is provided, it is characterized in that:
A, controlled reactor and small resistor are set on the substation grounding loop, its described controlled reactor has automatic control equipment, in order to control controlled reactor output offset current; Its described small resistor is connected in series with the substation grounding loop by high-voltage switch gear, in order to the input or the excision of control small resistor;
B, when power distribution network generation earth fault, calculate the inductive current of needs compensation according to the electric network capacitance and current value of having measured, control controlled reactor output offset current then;
C, the duration of single phase ground fault is measured and record;
D, if duration of single phase ground fault is shorter than setting-up time, then determine that it is transient earthing;
E, if single phase ground fault last longer than setting-up time, then determine that it is permanent earth;
F, the transient earthing in the single-phase earthing and permanent earth distinguished treat, take first treatment measures or second treatment measures respectively;
G, by distinguishing transient earthing and the permanent earth in the single-phase earthing, adopt different treatment measures, both guaranteed accurately isolating rapidly to permanent earth fault, avoid system's power frequency overvoltage long-term existence to cause accident further to enlarge, can carry out fine compensation to instantaneity earth fault again dies away it, need not tripping operation, improved the fail safe and the reliability of system.
Concrete, its described setting-up time is 10 seconds.
Further, its described first treatment measures comprise the following steps:
Calculate the inductive current that needs compensate according to the electric network capacitance and current value of having measured, control controlled reactor output offset current then;
Instantaneity earth fault is by after the inductive current compensation, and arc extinction earth fault is eliminated the recovery normal condition automatically, has fault to trip at once to make the situation that the line tripping rate is high to avoid occurring in the low resistance grounding mode one.
Further, its described second treatment measures comprise the following steps:
After the ground connection duration surpassed 10s, the auto-closing high-voltage switch gear dropped into small resistor, made the protection for feed line action, by switch trip excision faulty line;
After dropping into small resistor, controlled reactor withdraws from compensation automatically, and after faulty line was isolated, system restoration normally moved, and small resistor is withdrawed from the control device automatic disconnection.
After dropping into described small resistor, controlled reactor withdraws from compensation automatically; After faulty line was isolated, system restoration normally moved, high-voltage switch gear automatic disconnection small resistor.
Described automatic integratedization processing method adopts the use of uniting of controlled reactor and small resistor, and realize automaticallying switch, by the length of ground connection duration is judged, to distinguish transient earthing and permanent earth, by taking different counter-measures, thereby reach the purpose that improves Supply Security and reliability.
Compared with the prior art, advantage of the present invention is:
1. adopt the use of uniting of controlled reactor compensation and small resistor current limliting, and realize automaticallying switch, by the length of ground connection duration is judged, to distinguish transient earthing and permanent earth, by taking different counter-measures, thereby reach the purpose that improves Supply Security and reliability.
2. controlled reactor and small resistor are mature technology, and control is reliable, help to improve the reliable in action and the overall security of whole technical proposal, help to improve electric power system fail safe and reliability.
3. the transient earthing in the single-phase earthing and permanent earth are distinguished and treated, take different measures respectively, avoided the drawback of original single tupe, both guaranteed accurately isolating rapidly to permanent earth fault, avoid system's power frequency overvoltage long-term existence to cause accident further to enlarge, can carry out fine compensation to instantaneity earth fault again it is died away, need not tripping operation, improve the fail safe and the reliability of system.
Description of drawings
Fig. 1 is the block diagram of the automatic integratedization processing method of single phase ground fault of the present invention.
Embodiment
The present invention will be further described below in conjunction with accompanying drawing.
Among Fig. 1, technical scheme of the present invention provides a kind of automatic integratedization processing method of single phase ground fault, and its described automatic integratedization processing method comprises the following steps:
A, controlled reactor and small resistor (not shown) are set on the substation grounding loop, its described controlled reactor has automatic control equipment, in order to control controlled reactor output offset current; Its described small resistor is connected in series with the substation grounding loop by high-voltage switch gear, in order to the input or the excision of control small resistor;
B, when power distribution network generation earth fault, calculate the inductive current of needs compensation according to the electric network capacitance and current value of having measured, control controlled reactor output offset current then;
C, the duration of single phase ground fault is measured and record;
D, if duration of single phase ground fault is shorter than setting-up time, then determine that it is transient earthing;
E, if single phase ground fault last longer than setting-up time, then determine that it is permanent earth;
F, the transient earthing in the single-phase earthing and permanent earth distinguished treat, take first treatment measures or second treatment measures respectively;
G, by distinguishing transient earthing and the permanent earth in the single-phase earthing, adopt different treatment measures, both guaranteed accurately isolating rapidly to permanent earth fault, avoid system's power frequency overvoltage long-term existence to cause accident further to enlarge, can carry out fine compensation to instantaneity earth fault again dies away it, need not tripping operation, improved the fail safe and the reliability of system.
Concrete, its described setting-up time is 10 seconds.
Further, its described first treatment measures comprise the following steps:
Calculate the inductive current that needs compensate according to the electric network capacitance and current value of having measured, control controlled reactor output offset current then; Instantaneity earth fault is by after the inductive current compensation, and arc extinction earth fault is eliminated the recovery normal condition automatically, has fault to trip at once to make the situation that the line tripping rate is high to avoid occurring in the low resistance grounding mode one.
Further, its described second treatment measures comprise the following steps:
After the ground connection duration surpassed 10s, the auto-closing high-voltage switch gear dropped into small resistor, made the protection for feed line action, by switch trip excision faulty line; After dropping into small resistor, controlled reactor withdraws from compensation automatically, and after faulty line was isolated, system restoration normally moved, and small resistor is withdrawed from the control device automatic disconnection.
Further, after dropping into described small resistor, controlled reactor withdraws from compensation automatically; After faulty line was isolated, system restoration normally moved, high-voltage switch gear automatic disconnection small resistor.
Its described automatic integratedization processing method adopts the use of uniting of controlled reactor and small resistor, and realize automaticallying switch, by the length of ground connection duration is judged, to distinguish transient earthing and permanent earth, by taking different counter-measures, thereby reach the purpose that improves Supply Security and reliability.
Controlled reactor and two kinds of grounding apparatuss of small resistor are integrated consideration, transient earthing in the single-phase earthing and permanent earth distinguished treat, take different measures respectively, both guaranteed accurately isolating rapidly to permanent earth fault, avoid system's power frequency overvoltage long-term existence to cause accident further to enlarge, can carry out fine compensation to instantaneity earth fault again it is died away, need not tripping operation, improve the fail safe and the reliability of system.
Because controllable impedance compensation of ground mode (being commonly called as grounding through arc, down together) and low resistance grounding mode are prior art, so its concrete operation principle and realization circuit are no longer narrated at this.
Shown in relatively the seeing the following form of the technical program and prior art:
Because the present invention integrates consideration with controlled reactor and two kinds of grounding apparatuss of small resistor, the transient earthing in the earth fault and permanent earth distinguished treat, take different measures respectively.Avoided the drawback of original single tupe, both guaranteed accurately isolating rapidly to permanent earth fault, avoid system's power frequency overvoltage long-term existence to cause accident further to enlarge, can carry out fine compensation to instantaneity earth fault again dies away it, need not tripping operation, improved the fail safe and the reliability of system.
The present invention can be widely used in the system protection field of transformer station.
Claims (6)
1. the automatic integratedization processing method of a single phase ground fault is characterized in that:
A, controlled reactor and small resistor are set on the substation grounding loop, its described controlled reactor has automatic control equipment, in order to control controlled reactor output offset current; Its described small resistor is connected in series with the substation grounding loop by high-voltage switch gear, in order to the input or the excision of control small resistor;
B, when power distribution network generation earth fault, calculate the inductive current of needs compensation according to the electric network capacitance and current value of having measured, control controlled reactor output offset current then;
C, the duration of single phase ground fault is measured and record;
D, if duration of single phase ground fault is shorter than setting-up time, then determine that it is transient earthing;
E, if single phase ground fault last longer than setting-up time, then determine that it is permanent earth;
F, the transient earthing in the single-phase earthing and permanent earth distinguished treat, take first treatment measures or second treatment measures respectively;
G, by distinguishing transient earthing and the permanent earth in the single-phase earthing, adopt different treatment measures, both guaranteed accurately isolating rapidly to permanent earth fault, avoid system's power frequency overvoltage long-term existence to cause accident further to enlarge, can carry out fine compensation to instantaneity earth fault again dies away it, need not tripping operation, improved the fail safe and the reliability of system.
2. according to the automatic integratedization processing method of the described single phase ground fault of claim 1, it is characterized in that described setting-up time is 10 seconds.
3. according to the automatic integratedization processing method of the described single phase ground fault of claim 1, it is characterized in that described first treatment measures comprise the following steps:
Calculate the inductive current that needs compensate according to the electric network capacitance and current value of having measured, control controlled reactor output offset current then;
Instantaneity earth fault is by after the inductive current compensation, and arc extinction earth fault is eliminated the recovery normal condition automatically, has fault to trip at once to make the situation that the line tripping rate is high to avoid occurring in the low resistance grounding mode one.
4. according to the automatic integratedization processing method of the described single phase ground fault of claim 1, it is characterized in that described second treatment measures comprise the following steps:
After the ground connection duration surpassed 10s, the auto-closing high-voltage switch gear dropped into small resistor, made the protection for feed line action, by switch trip excision faulty line;
After dropping into small resistor, controlled reactor withdraws from compensation automatically, and after faulty line was isolated, system restoration normally moved, and small resistor is withdrawed from the control device automatic disconnection.
5. according to the automatic integratedization processing method of the described single phase ground fault of claim 1, it is characterized in that controlled reactor withdraws from compensation automatically after dropping into described small resistor; After faulty line was isolated, system restoration normally moved, high-voltage switch gear automatic disconnection small resistor.
6. according to the automatic integratedization processing method of the described single phase ground fault of claim 1, it is characterized in that described automatic integratedization processing method adopts the use of uniting of controlled reactor and small resistor, and realize automaticallying switch, by the length of ground connection duration is judged, to distinguish transient earthing and permanent earth, by taking different counter-measures, thereby reach the purpose that improves Supply Security and reliability.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2013101390058A CN103219721A (en) | 2013-04-19 | 2013-04-19 | Automatic integrated processing method for single-phase earth fault |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2013101390058A CN103219721A (en) | 2013-04-19 | 2013-04-19 | Automatic integrated processing method for single-phase earth fault |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN103219721A true CN103219721A (en) | 2013-07-24 |
Family
ID=48817303
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2013101390058A Pending CN103219721A (en) | 2013-04-19 | 2013-04-19 | Automatic integrated processing method for single-phase earth fault |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN103219721A (en) |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107271855A (en) * | 2017-07-31 | 2017-10-20 | 李景禄 | A kind of quick judgement and processing method for one-phase earthing failure in electric distribution network region |
| CN108132417A (en) * | 2017-11-24 | 2018-06-08 | 国网北京市电力公司 | Method for locating single-phase ground fault and device |
| CN110611317A (en) * | 2019-10-18 | 2019-12-24 | 云南电网有限责任公司电力科学研究院 | Earth fault current compensation system and method for self-generating power phase power supply |
| CN111157835A (en) * | 2018-11-07 | 2020-05-15 | 国网电力科学研究院武汉南瑞有限责任公司 | Power grid single-phase earth fault judgment method |
| CN112165079A (en) * | 2020-09-24 | 2021-01-01 | 云南电网有限责任公司电力科学研究院 | Method and device for designing current-limiting reactor of ground fault full-compensation system |
| CN113741387A (en) * | 2021-08-16 | 2021-12-03 | 北京工业大学 | Threshold value judgment method for instantaneous fault occurrence intensity |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201138751Y (en) * | 2007-12-11 | 2008-10-22 | 广州智光电气股份有限公司 | Earthing set equipment combining power grid controllable reaction with small resistance |
| CN102545171A (en) * | 2011-12-22 | 2012-07-04 | 江苏宏安变压器有限公司 | Multi-winding adjustable reactor and single phase grounding fault clearing method thereof |
| JP2012130107A (en) * | 2010-12-13 | 2012-07-05 | Chugoku Electric Power Co Inc:The | Ground fault protection relay system and ground fault protection method |
-
2013
- 2013-04-19 CN CN2013101390058A patent/CN103219721A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201138751Y (en) * | 2007-12-11 | 2008-10-22 | 广州智光电气股份有限公司 | Earthing set equipment combining power grid controllable reaction with small resistance |
| JP2012130107A (en) * | 2010-12-13 | 2012-07-05 | Chugoku Electric Power Co Inc:The | Ground fault protection relay system and ground fault protection method |
| CN102545171A (en) * | 2011-12-22 | 2012-07-04 | 江苏宏安变压器有限公司 | Multi-winding adjustable reactor and single phase grounding fault clearing method thereof |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107271855A (en) * | 2017-07-31 | 2017-10-20 | 李景禄 | A kind of quick judgement and processing method for one-phase earthing failure in electric distribution network region |
| CN108132417A (en) * | 2017-11-24 | 2018-06-08 | 国网北京市电力公司 | Method for locating single-phase ground fault and device |
| CN111157835A (en) * | 2018-11-07 | 2020-05-15 | 国网电力科学研究院武汉南瑞有限责任公司 | Power grid single-phase earth fault judgment method |
| CN110611317A (en) * | 2019-10-18 | 2019-12-24 | 云南电网有限责任公司电力科学研究院 | Earth fault current compensation system and method for self-generating power phase power supply |
| CN112165079A (en) * | 2020-09-24 | 2021-01-01 | 云南电网有限责任公司电力科学研究院 | Method and device for designing current-limiting reactor of ground fault full-compensation system |
| CN113741387A (en) * | 2021-08-16 | 2021-12-03 | 北京工业大学 | Threshold value judgment method for instantaneous fault occurrence intensity |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN203135436U (en) | Intelligent ground resistor complete equipment | |
| CN103219721A (en) | Automatic integrated processing method for single-phase earth fault | |
| CN101478150B (en) | Intelligent diagnosis method and apparatus for power transmission and distribution line state | |
| CN101183788A (en) | Power network controlled reactance and small resistor combination type earthing device | |
| CN203151088U (en) | Single-phase grounding fault isolation device | |
| CN101505053B (en) | Power line protection method based on user boundary circuit breaker devices | |
| CN104678260A (en) | System and method for single-phase grounding line selection of small current grounding system | |
| CN205544206U (en) | Intelligence PT harmonic elimination selects device of looks | |
| CN105356441A (en) | Intelligent PT harmonic elimination and phase selection method and device | |
| CN201138751Y (en) | Earthing set equipment combining power grid controllable reaction with small resistance | |
| CN102623984A (en) | System for grounding neutral point in power grid through controllable reactor and resistor in combined manner | |
| CN204405783U (en) | Cable line fault locating device and system | |
| CN103401225B (en) | Ground connection hold concurrently house transformer overcurrent protection setting method and connection jump method to set up | |
| CN202651781U (en) | Neutral point integrated grounding complete device | |
| CN203519768U (en) | Traveling-wave signal extraction equipment and system for single-phase earth fault | |
| CN104065056A (en) | Process control method of 10 kV power grid ground fault | |
| CN102332707B (en) | Earth fault signal measuring method and protective device for ungrounded system | |
| CN104821559A (en) | Neutral point joint grounding equipment self-protection method | |
| CN103236687B (en) | Short-time controllable reactor compensation method | |
| CN103227463A (en) | Isolation method for single-phase earth fault | |
| CN201774233U (en) | Novel protection device special for low voltage generator | |
| CN202495803U (en) | Isolation power supply cabinet used in medical treatment II type place | |
| CN202106867U (en) | Device for suppressing excess voltage of articulated phase insulator | |
| CN204012700U (en) | Power network neutral point grounding system | |
| CN203193273U (en) | Intelligent turn-adjustment arc-extinguishing voltage-limiting device |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C02 | Deemed withdrawal of patent application after publication (patent law 2001) | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20130724 |