CN106443339A - Method for selecting wire after single-phase grounding of ungrounded system - Google Patents
Method for selecting wire after single-phase grounding of ungrounded system Download PDFInfo
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- CN106443339A CN106443339A CN201610860449.4A CN201610860449A CN106443339A CN 106443339 A CN106443339 A CN 106443339A CN 201610860449 A CN201610860449 A CN 201610860449A CN 106443339 A CN106443339 A CN 106443339A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/08—Locating faults in cables, transmission lines, or networks
- G01R31/081—Locating faults in cables, transmission lines, or networks according to type of conductors
- G01R31/085—Locating faults in cables, transmission lines, or networks according to type of conductors in power transmission or distribution lines, e.g. overhead
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Abstract
The invention discloses a method for selecting a wire after single-phase grounding of an underground system. By adopting the method, after single-phase grounding happens in the ungrounded system, a fault wire can be selected according to the change of zero sequence current after a neutral point of a capacitor bank is instantly grounded. The method comprises the following steps: A, additionally installing a control switch and a medium resistor between the neutral point of a capacitor and the ground, and keeping the control switch on the point position during normal operation; B, judging whether single-phase grounding happens in a circuit or not according to the voltage change of a bus bar, and judging that single-phase grounding failure happens when the criterion is that a zero sequence voltage is more than a certain value, a certain phase voltage in three-phase voltages is reduced, and voltages of other two phases rise; C, immediately closing the control switch and putting in a resistor after single-phase grounding is judged to ensure that the grounding mode of the system is turned into grounding through the resistor and the active component of the zero sequence current of the single-phase grounded circuit is greatly increased; and D, tripping the circuit switch to clear the failure after the single-phase grounded circuit is determined.
Description
Technical field
The present invention relates to a kind of method that isolated neutral system occurs route selection after single-phase earthing.
Background technology
In China 35kV and 10kV power system, the neutral point of transformator, adopting non_direct ground mode (small current more
Earthed system), when there is singlephase earth fault in circuit, often little compared with load current many, the fault phase of the numerical value of fault current
Voltage is reduced to zero, and non-faulting phase voltage rises a height of phase voltageTimes, but the line voltage between three-phase is remained in that symmetrically, to supplying
Electric load does not affect, and therefore code allows to continue to run with 1～2h.But cause electric power electricity because of overvoltage in actual motion
The accidents such as cable blast, TV fuse melting even burn out, busbar short-circuit, rapid determination system earth point eliminates singlephase earth fault pair
The safe operation of system has highly important meaning, it is therefore desirable to research and develop a kind of new simple method to solve existing asking
Topic.
Content of the invention
Present invention aim to address above-mentioned the deficiencies in the prior art and problem, provide a kind of isolated neutral system and send out
The method of route selection after raw single-phase earthing, achievable isolated neutral system is instantaneously connect by capacitor bank neutral point after there is single-phase earthing
Behind ground, the change of zero-sequence current is selecting fault wire.When there is singlephase earth fault, by the intervals short time in electricity
Container group neutral point switching resistance completes route selection.
Technical scheme is as follows：
The method that the isolated neutral system of the present invention occurs route selection after single-phase earthing, which comprises the following steps：
A), in the transformer substation system of isolated neutral, install a control between the neutral point of capacitor and ground additional and open
Close and a middle resistance, when normally running, controlling switch is in a point position；
B), circuit is determined whether according to the change of busbar voltage and single-phase earthing is there occurs, criterion is that residual voltage is big
When a certain value, while certain phase voltage declines in three-phase voltage, other two-phase voltages are judged as single-phase earthing event when raising
Barrier；
C after), being judged as single-phase earthing, controlling switch of closing immediately, resistance is put into, now the earthing mode of system becomes
For resistance grounded, the real component that the zero-sequence current of single-phase earthing circuit occurs can be greatly increased；
D after), determining the circuit that single-phase earthing occurs, by the line switching tripping, fault is cut off.
The method that the isolated neutral system of the present invention occurs route selection after single-phase earthing, its further technical scheme be include with
Lower step：
A), in the transformer substation system of isolated neutral, install a control between the neutral point of capacitor and ground additional and open
Close and a resistance is 100 ohmages, when normally running, controlling switch is in a point position；
B), circuit is determined whether according to the change of busbar voltage and single-phase earthing is there occurs, criterion is that residual voltage is big
In 50V, while certain phase voltage is dropped by less than 30V in three-phase voltage, when other two-phase voltages are raised more than 70V, it is judged as occurring
Singlephase earth fault；
C after), being judged as single-phase earthing, controlling switch of closing immediately, resistance is put into, now the earthing mode of system becomes
For resistance grounded, the real component that the zero-sequence current of single-phase earthing circuit occurs can be greatly increased；
D after), determining the circuit that single-phase earthing occurs, by the line switching tripping, fault is cut off.
The method that the isolated neutral system of the present invention occurs route selection after single-phase earthing, its further technical scheme is to work as to send out
During raw singlephase earth fault, the input of controlling switch/exit for：Put into/exit each 60ms or fixing input, until sentencing
Faulty line.
The invention has the advantages that：
The present invention is by being occurred after single-phase earthing zero after the capacitor bank neutral point transient earthing using isolated neutral system
The change of sequence electric current is selecting fault wire, and method is simple and convenient, hence it is evident that improve fault detection efficiency, and reducing can in actual motion
The fault that can occur.
Description of the drawings
Fig. 1 is system outline figure
Fig. 2 is zero-sequence current loop diagram
Specific embodiment
Embodiment 1
The method that the isolated neutral system of the present invention occurs route selection after single-phase earthing, which comprises the following steps：
A), in the transformer substation system of isolated neutral, install a control between the neutral point of capacitor and ground additional and open
Close and one
Individual resistance is 100 ohmages, and when normally running, controlling switch is in a point position；
B), circuit is determined whether according to the change of busbar voltage and single-phase earthing is there occurs, criterion is that residual voltage is big
In 50V, while certain phase voltage is dropped by less than 30V in three-phase voltage, when other two-phase voltages are raised more than 70V, it is judged as occurring
Singlephase earth fault；
C after), being judged as single-phase earthing, controlling switch of closing immediately, resistance is put into, now the earthing mode of system becomes
For resistance grounded, the real component that the zero-sequence current of single-phase earthing circuit occurs can be greatly increased；
D after), determining the circuit that single-phase earthing occurs, by the line switching tripping, fault is cut off.
When there is singlephase earth fault, the input of controlling switch/exit for：Put into/exit each 60ms
Embodiment 2
The method that the isolated neutral system of the present invention occurs route selection after single-phase earthing, which comprises the following steps：
A), in the transformer substation system of isolated neutral, install a control between the neutral point of capacitor and ground additional and open
Close and a resistance is 100 ohmages, when normally running, controlling switch is in a point position；
B), circuit is determined whether according to the change of busbar voltage and single-phase earthing is there occurs, criterion is that residual voltage is big
In 50V, while certain phase voltage is dropped by less than 30V in three-phase voltage, when other two-phase voltages are raised more than 70V, it is judged as occurring
Singlephase earth fault；
C after), being judged as single-phase earthing, controlling switch of closing immediately, resistance is put into, now the earthing mode of system becomes
For resistance grounded, the real component that the zero-sequence current of single-phase earthing circuit occurs can be greatly increased；
D after), determining the circuit that single-phase earthing occurs, by the line switching tripping, fault is cut off.
When there is singlephase earth fault, the input of controlling switch/exit for：Fixing input, until sentence the circuit that is out of order.
Claims (3)
1. a kind of method that isolated neutral system occurs route selection after single-phase earthing, it is characterised in that comprise the following steps：
A), in the transformer substation system of isolated neutral, install additional between the neutral point of capacitor and ground a controlling switch and
One middle resistance, when normally running, controlling switch is in a point position；
B), circuit is determined whether according to the change of busbar voltage and single-phase earthing is there occurs, criterion is more than certain for residual voltage
During one value, while certain phase voltage declines in three-phase voltage, other two-phase voltages are judged as singlephase earth fault when raising；
C after), being judged as single-phase earthing, controlling switch of closing immediately, resistance is put into, now system earthing mode become in order to
Resistance grounded, the real component that the zero-sequence current of single-phase earthing circuit occurs can be greatly increased；
D after), determining the circuit that single-phase earthing occurs, by the line switching tripping, fault is cut off.
2. the method that isolated neutral system according to claim 1 occurs route selection after single-phase earthing, it is characterised in that include with
Lower step：
A), in the transformer substation system of isolated neutral, install additional between the neutral point of capacitor and ground a controlling switch and
When one resistance is 100 ohmages, normally to run, controlling switch is in a point position；
B), circuit is determined whether according to the change of busbar voltage and single-phase earthing is there occurs, criterion is more than for residual voltage
50V, while certain phase voltage is dropped by less than 30V in three-phase voltage, when other two-phase voltages are raised more than 70V, is judged as list
Phase earth fault；
C after), being judged as single-phase earthing, controlling switch of closing immediately, resistance is put into, now system earthing mode become in order to
Resistance grounded, the real component that the zero-sequence current of single-phase earthing circuit occurs can be greatly increased；
D after), determining the circuit that single-phase earthing occurs, by the line switching tripping, fault is cut off.
3. the method that isolated neutral system according to claim 1 occurs route selection after single-phase earthing, it is characterised in that work as generation
During singlephase earth fault, the input of controlling switch/exit for：Put into/exit each 60ms or fixing input, until sentence event
Barrier circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610860449.4A CN106443339A (en) | 2016-09-28 | 2016-09-28 | Method for selecting wire after single-phase grounding of ungrounded system |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201610860449.4A CN106443339A (en) | 2016-09-28 | 2016-09-28 | Method for selecting wire after single-phase grounding of ungrounded system |
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Cited By (16)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106771887A (en) * | 2017-03-13 | 2017-05-31 | 安徽天电气技术股份有限公司 | A kind of instantaneous zero sequence voltage drives ground fault line selection device |
| CN106872857A (en) * | 2017-03-13 | 2017-06-20 | 安徽天电气技术股份有限公司 | A kind of residual voltage drives the ground fault line selection device of zero-sequence current |
| CN107300656A (en) * | 2017-06-17 | 2017-10-27 | 李景禄 | A kind of earth fault based on power network characteristic parameter incremental starts method |
| CN107340416A (en) * | 2017-08-28 | 2017-11-10 | 国网江西省电力公司电力科学研究院 | A kind of distribution network failure indicator LC tunings are outer to apply signal source |
| CN108152683A (en) * | 2018-01-10 | 2018-06-12 | 济南大学 | Based on the earth fault line selection method for helping increasing principle |
| CN108614180A (en) * | 2018-04-12 | 2018-10-02 | 山东钢铁股份有限公司 | Singlephase earth fault circuit lookup method |
| CN110568316A (en) * | 2019-10-16 | 2019-12-13 | 国网四川省电力公司绵阳供电公司 | Method for quickly selecting line of ground fault of low-current grounding system |
| CN110687403A (en) * | 2019-11-21 | 2020-01-14 | 济南泰景电力技术有限公司 | Power distribution network single-phase earth fault detection method and device |
| CN111308276A (en) * | 2020-04-08 | 2020-06-19 | 广东电网有限责任公司电力调度控制中心 | Power distribution network fault positioning method and device |
| CN111880110A (en) * | 2019-04-15 | 2020-11-03 | 山东大学 | Single-phase earth fault disappearance judgment method and system for neutral point non-effective earthing system |
| CN112255573A (en) * | 2020-11-20 | 2021-01-22 | 国网江苏省电力有限公司盐城供电分公司 | Single-phase earth fault processing method for neutral point ungrounded system |
| CN112909904A (en) * | 2021-03-03 | 2021-06-04 | 广东电网有限责任公司 | Resistance grounding system and control method thereof |
| CN113725811A (en) * | 2020-12-12 | 2021-11-30 | 保定钰鑫电气科技有限公司 | Method for processing single-phase grounding of non-effective grounding system |
| CN114089107A (en) * | 2021-11-16 | 2022-02-25 | 国网福建省电力有限公司南平供电公司 | Capacitor line selection method for grounding of central point of transformer substation for single-phase grounding fault disposal |
| CN115825638A (en) * | 2022-09-08 | 2023-03-21 | 北京昊创瑞通电气设备股份有限公司 | Power distribution network single-phase earth fault comprehensive judgment system and method |
| CN116482488A (en) * | 2023-06-16 | 2023-07-25 | 国网山东省电力公司东营供电公司 | Power distribution network ground fault distance measurement method and system based on capacitive transient |
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Cited By (22)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106872857A (en) * | 2017-03-13 | 2017-06-20 | 安徽天电气技术股份有限公司 | A kind of residual voltage drives the ground fault line selection device of zero-sequence current |
| CN106771887A (en) * | 2017-03-13 | 2017-05-31 | 安徽天电气技术股份有限公司 | A kind of instantaneous zero sequence voltage drives ground fault line selection device |
| CN107300656A (en) * | 2017-06-17 | 2017-10-27 | 李景禄 | A kind of earth fault based on power network characteristic parameter incremental starts method |
| CN107340416A (en) * | 2017-08-28 | 2017-11-10 | 国网江西省电力公司电力科学研究院 | A kind of distribution network failure indicator LC tunings are outer to apply signal source |
| CN108152683A (en) * | 2018-01-10 | 2018-06-12 | 济南大学 | Based on the earth fault line selection method for helping increasing principle |
| CN108614180B (en) * | 2018-04-12 | 2020-05-29 | 山东钢铁股份有限公司 | Single-phase earth fault line searching method |
| CN108614180A (en) * | 2018-04-12 | 2018-10-02 | 山东钢铁股份有限公司 | Singlephase earth fault circuit lookup method |
| CN111880110A (en) * | 2019-04-15 | 2020-11-03 | 山东大学 | Single-phase earth fault disappearance judgment method and system for neutral point non-effective earthing system |
| CN111880110B (en) * | 2019-04-15 | 2021-08-27 | 山东大学 | Single-phase earth fault disappearance judgment method and system for neutral point non-effective earthing system |
| CN110568316A (en) * | 2019-10-16 | 2019-12-13 | 国网四川省电力公司绵阳供电公司 | Method for quickly selecting line of ground fault of low-current grounding system |
| CN110687403A (en) * | 2019-11-21 | 2020-01-14 | 济南泰景电力技术有限公司 | Power distribution network single-phase earth fault detection method and device |
| CN111308276A (en) * | 2020-04-08 | 2020-06-19 | 广东电网有限责任公司电力调度控制中心 | Power distribution network fault positioning method and device |
| CN112255573A (en) * | 2020-11-20 | 2021-01-22 | 国网江苏省电力有限公司盐城供电分公司 | Single-phase earth fault processing method for neutral point ungrounded system |
| CN112255573B (en) * | 2020-11-20 | 2022-12-23 | 国网江苏省电力有限公司盐城供电分公司 | Single-phase earth fault processing method for neutral point ungrounded system |
| CN113725811A (en) * | 2020-12-12 | 2021-11-30 | 保定钰鑫电气科技有限公司 | Method for processing single-phase grounding of non-effective grounding system |
| CN113725811B (en) * | 2020-12-12 | 2023-12-05 | 保定钰鑫电气科技有限公司 | Single-phase grounding processing method of non-effective grounding system |
| CN112909904A (en) * | 2021-03-03 | 2021-06-04 | 广东电网有限责任公司 | Resistance grounding system and control method thereof |
| CN114089107A (en) * | 2021-11-16 | 2022-02-25 | 国网福建省电力有限公司南平供电公司 | Capacitor line selection method for grounding of central point of transformer substation for single-phase grounding fault disposal |
| CN114089107B (en) * | 2021-11-16 | 2023-12-22 | 国网福建省电力有限公司南平供电公司 | Capacitor line selection method for single-phase grounding fault handling of transformer substation center point grounding |
| CN115825638A (en) * | 2022-09-08 | 2023-03-21 | 北京昊创瑞通电气设备股份有限公司 | Power distribution network single-phase earth fault comprehensive judgment system and method |
| CN116482488A (en) * | 2023-06-16 | 2023-07-25 | 国网山东省电力公司东营供电公司 | Power distribution network ground fault distance measurement method and system based on capacitive transient |
| CN116482488B (en) * | 2023-06-16 | 2023-09-22 | 国网山东省电力公司东营供电公司 | Power distribution network ground fault distance measurement method and system based on capacitive transient |
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Application publication date: 20170222 |