CN104635107A - Small-current grounding fault line selection system and line selection method - Google Patents
Small-current grounding fault line selection system and line selection method Download PDFInfo
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- CN104635107A CN104635107A CN201510089584.9A CN201510089584A CN104635107A CN 104635107 A CN104635107 A CN 104635107A CN 201510089584 A CN201510089584 A CN 201510089584A CN 104635107 A CN104635107 A CN 104635107A
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Abstract
The invention provides a small-current grounding fault line selection system, which comprises zero sequence current transformers, a voltage transformer, a grounding transformer, a grounding loop and a grounding line selection device, wherein the zero current transformers are arranged on each feed line, the voltage transformer is arranged on a bus, the grounding transformer is connected with the bus, the grounding loop is connected between a high-voltage side neutral point of the grounding transformer and the ground, and is connected in series with a grounding resistor and a contactor used for controlling the on-off state of the loop, the grounding line selection device is respectively connected with the zero sequence current transformer, the voltage transformer and the contactor, and is used for controlling the conduction of the grounding loop when the voltage transformer detects the zero sequence voltage, and then, a fault line is judged according to the current data collected by the zero sequence current transformer.
Description
Technical field
The present invention relates to grounding failure wire selection system and the selection method of small current neutral grounding system.
Background technology
For 10KV isolated neutral power distribution network, when a certain bar circuit generation single-phase earthing, its principal character: the size of zero-sequence current on non-faulting line, equal the capacitive earth current of this circuit itself, direction flows to circuit by bus; The size of zero-sequence current on fault wire, equals all non-fault line capacitive earth current sums, direction by line flows to bus.At present, usually can only utilize the difference of above-mentioned zero-sequence current, adopt zero sequence power direction method or zero-sequence current amplitude com parison method to realize microcomputer earthing wire-selecting.Because isolated neutral system singlephase earth fault amount is little, fault signature is not obvious, and add the impact being subject to the many factors such as electric network composition, nature of trouble, zero sequence current mutual inductor precision, earthing wire-selecting accuracy rate is not high, is generally no more than 70%.
Summary of the invention
The object of the invention is for the deficiencies in the prior art, a kind of small current grounding failure wire selection system and method for high-accuracy are provided.
Object of the present invention realizes by following technical solution:
A kind of small current grounding failure wire selection system, for the earth fault line selection of isolated neutral power distribution network, this power distribution network comprises some feeder lines of substation bus bar and difference connection bus, it is characterized in that: described grounding failure wire selection system comprises the zero sequence current mutual inductor be arranged on each feeder line, be arranged on the voltage transformer (VT) on bus, the grounding transformer be connected with bus, be connected to the ground loop between grounding transformer high-pressure side neutral point and the earth, and line-selected earthing device, described ground loop is serially connected with stake resistance and the contactor for control loop break-make, described line-selected earthing device respectively with zero sequence current mutual inductor, voltage transformer (VT) is connected with contactor, for when voltage transformer (VT) detects residual voltage, control described ground loop conducting, then according to the current data failure judgement circuit that zero sequence current mutual inductor gathers.
Further, be 130-140 Ω for the resistance of stake resistance described in 10KV isolated neutral power distribution network.
A selection method for small current grounding failure wire selection system, is characterized in that: comprise the steps:
(1), when generation singlephase earth fault, voltage transformer (VT) detects residual voltage and feeds back to line-selected earthing device, and when residual voltage exceedes preset value, line-selected earthing device control contactor closes a floodgate and stake resistance come into operation and disconnects after 1-2 second;
(2), within the time that stake resistance comes into operation, each zero sequence current mutual inductor gathers the zero-sequence current of each feeder line and feeds back to line-selected earthing device, the zero-sequence current of line-selected earthing device to each feeder line compares, wherein, zero-sequence current has compared with macromutation amount or has obvious current in resistance property increment, be then judged to be earth fault line.
The present invention has following beneficial effect:
Put into operation the initial stage at power distribution network, circuit is less, cable is less, and system is less, usually adopts isolated neutral mode to run (also not needing to install arc suppression coil).Property point isolated neutral system hereinto, the present invention, by dropping into the method for stake resistance instantaneously, is accurately grounded route selection, in theory, route selection accuracy rate for stabilized single phase earth fault can up to 100%, and the route selection accuracy rate for instantaneity arc grounding fault also can improve greatly.
When power distribution network development or cable large percentage, when singlephase earth fault capacitance current exceedes regulations stipulate value (overhead system 10A or full cable system 30A), system neutral adopts grounding through arc mode.At this moment, the equipment such as the resistor that early stage installs can utilize in the same old way, do not cause the waste in equipment investment.When generation singlephase earth fault, after arc suppression coil inductance current compensates earth fault capacity current, if fault disappears not yet, then be judged to be permanent earth fault, now, by dropping into the method for stake resistance instantaneously, accurately can be grounded route selection, solving the difficult problem that resonance grounding (neutral by arc extinction coil grounding) system earth route selection accuracy rate is low better equally.
Accompanying drawing explanation
Below in conjunction with accompanying drawing, the present invention is described in further detail.
Fig. 1 is structural representation of the present invention.
Embodiment
With reference to shown in Fig. 1, small current grounding failure wire selection system is used for the earth fault line selection of 10KV isolated neutral power distribution network, and this power distribution network comprises some feeder lines 2 of bus 1 and difference connection bus 1.
A kind of small current grounding failure wire selection system, comprise the zero sequence current mutual inductor 4 be arranged on each feeder line 2, be arranged on the voltage transformer (VT) 5 on bus 1, the grounding transformer 6 be connected with bus 1, be connected to the ground loop 7 between grounding transformer 6 high-pressure side (Z-type wiring) neutral point and the earth, and line-selected earthing device 3, ground loop 7 is serially connected with stake resistance 71 that resistance is 135 Ω and the vacuum contactor 72 for control loop break-make, line-selected earthing device 3 respectively with zero sequence current mutual inductor 4, voltage transformer (VT) 5 is connected with vacuum contactor 72, for when voltage transformer (VT) 5 detects residual voltage, control ground loop 7 conducting, then according to the current data failure judgement circuit that zero sequence current mutual inductor 4 gathers.
The selection method of above-mentioned small current grounding failure wire selection system, comprises the steps:
(1), when generation singlephase earth fault, voltage transformer (VT) 5 detects residual voltage and feeds back to line-selected earthing device 3, when residual voltage exceedes preset value, as secondary side 25V, then line-selected earthing device 3 control vacuum contactor 72 close a floodgate stake resistance 71 is come into operation and disconnected after about 1 second;
(2), within the blink that stake resistance 71 comes into operation, each zero sequence current mutual inductor 4 gathers the zero-sequence current of each feeder line and feeds back to line-selected earthing device 3, the zero-sequence current of line-selected earthing device 3 to each feeder line 2 carries out transverse and longitudinal and compares, wherein, zero-sequence current has compared with macromutation amount or has obvious current in resistance property increment, be then judged to be earth fault line.
The above, be only preferred embodiment of the present invention, therefore can not limit scope of the invention process with this, and the equivalence namely done according to the present patent application the scope of the claims and description changes and modifies, and all should still remain within the scope of the patent.
Claims (3)
1. a small current grounding failure wire selection system, for the earth fault line selection of isolated neutral power distribution network, this power distribution network comprises some feeder lines of substation bus bar and difference connection bus, it is characterized in that: described grounding failure wire selection system comprises the zero sequence current mutual inductor be arranged on each feeder line, be arranged on the voltage transformer (VT) on bus, the grounding transformer be connected with bus, be connected to the ground loop between grounding transformer high-pressure side neutral point and the earth, and line-selected earthing device, described ground loop is serially connected with stake resistance and the contactor for control loop break-make, described line-selected earthing device respectively with zero sequence current mutual inductor, voltage transformer (VT) is connected with contactor, for when voltage transformer (VT) detects residual voltage, control described ground loop conducting, then according to the current data failure judgement circuit that zero sequence current mutual inductor gathers.
2. a kind of small current grounding failure wire selection system according to claim 1, is characterized in that: be 130-140 Ω for the resistance of stake resistance described in 10KV isolated neutral power distribution network.
3. a selection method for small current grounding failure wire selection system, is characterized in that: comprise the steps:
(1), when generation singlephase earth fault, voltage transformer (VT) detects residual voltage and feeds back to line-selected earthing device, and when residual voltage exceedes preset value, line-selected earthing device control contactor closes a floodgate and stake resistance come into operation and disconnects after 1-2 second;
(2), within the time that stake resistance comes into operation, line-selected earthing device gathers the zero-sequence current of each feeder line by zero sequence current mutual inductor, the zero-sequence current of each feeder line is compared, wherein, zero-sequence current has compared with macromutation amount or has obvious current in resistance property increment, be then judged to be earth fault line.
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| CN201510089584.9A CN104635107A (en) | 2015-02-27 | 2015-02-27 | Small-current grounding fault line selection system and line selection method |
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Cited By (14)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106483427A (en) * | 2016-09-30 | 2017-03-08 | 广东电网有限责任公司潮州供电局 | Small current earthing wire-selecting method |
| 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 |
| CN106814279A (en) * | 2017-03-13 | 2017-06-09 | 安徽天电气技术股份有限公司 | Line-selected earthing device |
| CN106872858A (en) * | 2017-03-13 | 2017-06-20 | 安徽天电气技术股份有限公司 | A kind of earth fault line selection, processing unit |
| CN107247209A (en) * | 2017-07-31 | 2017-10-13 | 安徽天电气技术股份有限公司 | High resistance earthing fault selection method |
| CN107561404A (en) * | 2016-06-30 | 2018-01-09 | 中国电力科学研究院 | A kind of voltage selection method of resonant earthed system |
| CN108258674A (en) * | 2018-04-10 | 2018-07-06 | 南京南瑞继保电气有限公司 | The singlephase earth fault arc-extinguishing system and method for a kind of small current neutral grounding system |
| CN108258668A (en) * | 2018-03-30 | 2018-07-06 | 九江电力勘察设计院有限公司 | Disturbance DC component line selection apparatus based on silicon-controlled generation during single-phase earthing |
| CN109031050A (en) * | 2018-09-12 | 2018-12-18 | 国网湖北省电力有限公司武汉供电公司 | The judgment method of line-to-ground fault in a kind of small current neutral grounding system |
| CN110261737A (en) * | 2019-07-09 | 2019-09-20 | 安徽亚辉电气技术有限公司 | A kind of smart grounding route selection complexes |
| CN110535116A (en) * | 2019-09-10 | 2019-12-03 | 北京华电瑞通电力工程技术有限公司 | A kind of arc extinction cabinet and small current neutral grounding system |
| CN107561408B (en) * | 2017-08-28 | 2019-12-06 | 济南大学 | Method for improving accuracy rate of small current ground fault line selection |
| CN111463760A (en) * | 2020-03-18 | 2020-07-28 | 国网陕西省电力公司延安供电公司 | Zero-sequence disturbance line selection protection system for neutral ungrounded substation and application thereof |
| CN114204518A (en) * | 2021-12-15 | 2022-03-18 | 于光勇 | Zero sequence protection system for ungrounded system with new energy of 35kV or below |
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| JP2002296317A (en) * | 2001-03-30 | 2002-10-09 | West Japan Railway Co | Ground-fault detection and display device |
| CN200953470Y (en) * | 2006-10-10 | 2007-09-26 | 杜志庭 | Small current grounding wire selecting device for neutral point non-effective ground connection system |
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Cited By (15)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107561404A (en) * | 2016-06-30 | 2018-01-09 | 中国电力科学研究院 | A kind of voltage selection method of resonant earthed system |
| CN107561404B (en) * | 2016-06-30 | 2021-04-06 | 中国电力科学研究院 | Voltage line selection method of resonant grounding system |
| CN106483427A (en) * | 2016-09-30 | 2017-03-08 | 广东电网有限责任公司潮州供电局 | Small current earthing wire-selecting method |
| 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 |
| CN106814279A (en) * | 2017-03-13 | 2017-06-09 | 安徽天电气技术股份有限公司 | Line-selected earthing device |
| CN106872858A (en) * | 2017-03-13 | 2017-06-20 | 安徽天电气技术股份有限公司 | A kind of earth fault line selection, processing unit |
| CN107247209A (en) * | 2017-07-31 | 2017-10-13 | 安徽天电气技术股份有限公司 | High resistance earthing fault selection method |
| CN107561408B (en) * | 2017-08-28 | 2019-12-06 | 济南大学 | Method for improving accuracy rate of small current ground fault line selection |
| CN108258668A (en) * | 2018-03-30 | 2018-07-06 | 九江电力勘察设计院有限公司 | Disturbance DC component line selection apparatus based on silicon-controlled generation during single-phase earthing |
| CN108258674A (en) * | 2018-04-10 | 2018-07-06 | 南京南瑞继保电气有限公司 | The singlephase earth fault arc-extinguishing system and method for a kind of small current neutral grounding system |
| CN109031050A (en) * | 2018-09-12 | 2018-12-18 | 国网湖北省电力有限公司武汉供电公司 | The judgment method of line-to-ground fault in a kind of small current neutral grounding system |
| CN110261737A (en) * | 2019-07-09 | 2019-09-20 | 安徽亚辉电气技术有限公司 | A kind of smart grounding route selection complexes |
| CN110535116A (en) * | 2019-09-10 | 2019-12-03 | 北京华电瑞通电力工程技术有限公司 | A kind of arc extinction cabinet and small current neutral grounding system |
| CN111463760A (en) * | 2020-03-18 | 2020-07-28 | 国网陕西省电力公司延安供电公司 | Zero-sequence disturbance line selection protection system for neutral ungrounded substation and application thereof |
| CN114204518A (en) * | 2021-12-15 | 2022-03-18 | 于光勇 | Zero sequence protection system for ungrounded system with new energy of 35kV or below |
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