CN105932658A - Arc-extinction apparatus for power distribution network and arc-extinction method for power distribution network by arc-extinction apparatus - Google Patents
Arc-extinction apparatus for power distribution network and arc-extinction method for power distribution network by arc-extinction apparatus Download PDFInfo
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- CN105932658A CN105932658A CN201610464248.2A CN201610464248A CN105932658A CN 105932658 A CN105932658 A CN 105932658A CN 201610464248 A CN201610464248 A CN 201610464248A CN 105932658 A CN105932658 A CN 105932658A
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- distribution network
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H9/00—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection
- H02H9/08—Limitation or suppression of earth fault currents, e.g. Petersen coil
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- Emergency Protection Circuit Devices (AREA)
- Remote Monitoring And Control Of Power-Distribution Networks (AREA)
Abstract
The invention provides an arc-extinction apparatus for a power distribution network. The apparatus comprises first-level switches, a second-level switch, a voltage transformer, a voltage sampling unit, a current transformer, a monitoring unit and a high-voltage fuse, wherein the voltage transformer is serially connected with the high-voltage fuse, and then the voltage transformer and the high-voltage fuse are connected between a bus and a grounding grid; the high-voltage ends of three single-phase high-voltage switches of the first-level switches are connected with three phases of buses respectively while the lower-voltage ends of the three single-phase high-voltage switches of the first-level switch are connected in parallel and then are connected with the high-voltage end of the second-level switch; the low-voltage end of the second-level switch is serially connected with the current transformer and then is connected with the grounding grid; the voltage sampling unit is connected between the high-voltage end of the second-level switch and the current transformer; and the monitoring unit is used for monitoring and analyzing according to the secondary side phase voltage and the open triangular voltage of the voltage transformer to obtain a fault judgment result, then outputting switch-off and switch-on instructions, and controlling the actions of the first-level switches and the second-level switch. By adoption of the arc-extinction apparatus, the single-phase arc light grounding fault of the power distribution network caused by lightning flash-over and the like can be eliminated; and meanwhile, the arc-extinction apparatus has a protection function and can effectively prevent interphase short circuit when an arc-extinction action is implemented.
Description
Technical field
The present invention relates to power system earth fault processing technology field, specifically a kind of power distribution network
Arc-extinction device and use the method that this device carries out power distribution network extinguishing arc.
Background technology
China's power distribution network is neutral point non-direct grounding system, need to configure arc-extinction device to eliminate thunder
The singlephase earth faults such as lighting network.China's power distribution network arc-extinction device is mainly arc suppression coil at present,
Its principle is, when electrical network generation singlephase earth fault, it is provided that an inductive current, compensation of ground
Capacitance current, makes the electric current of trouble point reduce, also makes the recovery at fault phase ground arc two ends
Voltage speed reduces, and reaches to extinguish the purpose of electric arc.But along with urban power distribution network development and high pressure
Cable application, single-phase earth fault current constantly increases, the capacity of supporting arc suppression coil and cost
Significantly increasing therewith and improve, its price is sometimes up to hundreds of thousands unit；On the other hand, if newly expanding
Power circuit, power-to-ground capacitance change makes single-phase earth fault current increase, when beyond pacifying
During dress arc suppression coil compensation scope, then must change or increase new arc suppression coil, make power distribution network set
Standby investment and management workload greatly increase.
Summary of the invention
It is an object of the invention to provide a kind of power distribution network arc-extinction device and use this device to join
The method of electric wire netting arc extinguishing, its simple in construction, cost is low, can effectively eliminate lightning flash over etc. and cause
Power distribution network single-phase arc grounding fault, and fault current size is the most strictly limited, i.e.
Make electrical network increasing expansion this device of new line without adjustment, be provided simultaneously with defencive function, disappear in execution
Phase fault can be effectively prevented during arc action.
For realizing this purpose, the present invention provides a kind of power distribution network arc-extinction device, switch including one-level,
Secondary switch, voltage transformer, voltage sampling unit, current transformer, monitoring unit and
High-tension fuse, described voltage transformer string high-tension fuse is connected between bus and earth mat；
Described one-level switch is three single-phase high voltage switches, and described secondary switch is that a single-phase high voltage is opened
Closing, the high-pressure side of three single-phase high voltage switches of one-level switch couples with three-phase bus respectively, low
After pressure side parallel connection, the high-pressure side with secondary switch is connected, and the low-pressure end string electric current of secondary switch is mutual
Sensor couples with earth mat, and voltage sampling unit is connected on high-pressure side and the current transformer of secondary switch
Between, monitoring unit is for obtaining the secondary side phase voltage of voltage transformer output and opening triangle electricity
Voltage between high-pressure side and the earth mat of the secondary switch of pressure, voltage sampling unit output and electricity
The electric current forming loop through earth mat of current transformer monitoring, and according to the secondary side of voltage transformer
Phase voltage, open triangular voltages and be monitored and analyzed and draw breakdown judge result, sentence according to fault
Disconnected result output point, reclosing command, control one-level switch and secondary switch action.
Further, the pressure grade of described single-phase high voltage switch is identical with distribution network voltage grade.
Further, the pressure grade of described voltage transformer is identical with distribution network voltage grade,
Described voltage transformer is with secondary side phase voltage winding and opens triangle winding.
Further, described voltage sampling unit is for obtaining high-pressure side and the earth mat of secondary switch
Between voltage, described voltage sampling unit is high-voltage bleeder or single-phase potential transformer, resistance to
Pressure grade is identical with distribution network voltage grade.
Further, the electric pressure of described high-tension fuse is identical with distribution network voltage grade.
Further, described monitoring unit is additionally operable to show voltage x current data and status information,
Video data include secondary side phase voltage that voltage transformer exports and open triangular voltages, voltage takes
The voltage at the secondary switch two ends of sample unit output and the loop current of current transformer output
Value, status information include separate, the one-level switch motion instruction execution state of fault phase, two grades
Switch order performs state.
A kind of method utilizing said apparatus to carry out power distribution network extinguishing arc, it is mutual that monitoring unit obtains voltage
The secondary side phase voltage of sensor output and open triangular voltages, and carries out data analysis, works as power distribution network
When there is arc grounding fault, secondary side phase voltage and open triangular voltages generation ANOMALOUS VARIATIONS, prison
Control unit judges fault phase by fault phase identification program, and sends instruction, controls one-level and opens
Close and secondary switch performs feed motion, after time delay certain time, send separating brake instruction, control
One-level processed switch and secondary switch perform separating brake action, thus complete arc eliminator.
Further, if monitoring unit fault phase correct judgment, one-level switch is connected to fault
The high-voltage switch gear gone up mutually closes a floodgate, then being applied to the voltage on voltage sampling unit is faulted phase voltage
Being low-voltage, during low-voltage, secondary switch does not has locking, and the instruction receiving monitoring unit can be real
Now closing a floodgate, so that bus-bar fault phase and ground net couples, after time delay certain time, trouble point is empty
Gas insulation recovery, monitoring unit sends instruction again, controls one-level switch and secondary switch separating brake；
If fault phase misjudgment, monitoring unit sends instruction, controls one-level switch and is connected to program
After the high-voltage switch gear on fault phase judged closes a floodgate, because being applied to the voltage on voltage sampling unit
Being high voltage for healthy phases voltage, secondary switch is in blocking, and secondary switch receives
Reclosing command can not close a floodgate in tripping, to avoid fault phase erroneous judgement to cause phase fault accident, time delay
After certain time, monitoring unit sends instruction again and controls one-level switch and secondary switch separating brake.
The present invention uses technique scheme to have following beneficial effect and an advantage:
The present invention is by conventional single-phase high voltage switch, voltage transformer, current transformer and monitoring
Unit forms, thus there is simple in construction, advantage that cost is low；Owing to high-voltage switch gear is to realize
The transfer of fault current path uniquely switch equipment, the through-current capability of conventional high-pressure switch up to
More than 1000A, and fault current is typically at below 100A, therefore the present invention is to fault current
Size the most strictly limits, even if electrical network increasing expansion this device of new line is without adjustment, significantly subtracts
Few Distribution Network Equipment investment and management workload, economic benefit is obvious.
The present invention adds by high-voltage bleeder or single-phase potential transformer structure in controlling loop
The safety guard become, if breaking down phase misjudgment, protection device can keep high pressure
Switch is in blocking, does not perform reclosing command, and therefore the present invention is prevented from phase fault
Accident, guarantee power grid security, thus beneficially popularization and application.
Accompanying drawing explanation
Fig. 1 is the electrical block diagram of power distribution network arc-extinction device of the present invention.
In figure: 1 one-level switch, 2 secondary switch, 3 voltage transformers, 4 voltages take
Sample unit, 5 current transformers, 6 monitoring units, 7 high-tension fuses.
Detailed description of the invention
Below in conjunction with the accompanying drawing in the present invention, the technical scheme in the present invention is carried out clear,
It is fully described by.
Fig. 1 show the electrical block diagram of the present invention a kind of power distribution network arc-extinction device, described
Power distribution network arc-extinction device includes one-level switch 1, secondary switch 2, voltage transformer 3, voltage
Sampling unit 4, current transformer 5, monitoring unit 6 and high-tension fuse 7.
Described one-level switch 1 is three single-phase high voltages switches, their high-pressure side respectively with three-phase
Bus couples, and after low-pressure end parallel connection, the high-pressure side with secondary switch 2 couples.
Described secondary switch 2 is a single-phase high voltage switch, its high-pressure side and one-level switch 1
Low-pressure end couples, and low-pressure end couples with earth mat through current transformer 5.
Described voltage transformer 3 is gone here and there high-tension fuse 7 and is connected between bus and earth mat, voltage
Transformer 3 is with secondary side phase voltage winding and opens triangle winding.
Described voltage sampling unit 4 is connected in high-pressure side and the current transformer 5 of secondary switch 2
Between, export to monitoring unit 6 after being used for obtaining voltage signal.
Described current transformer 5 is serially connected in the loop of secondary switch 2 and earth mat, is used for monitoring
Loop current.
The input of described monitoring unit 6 respectively with voltage transformer 3, voltage sampling unit 4,
The outfan of current transformer 5 couples, and the outfan of described monitoring unit 6 leaves with one-level respectively
Pass 1, secondary switch 2 couple.Described monitoring unit 6 is for the secondary to voltage transformer 3
Side phase voltage, open triangular voltages and be monitored and analyzed, there is fault phase if analyzing, then control
One-level processed switch 1 and secondary switch 2 perform feed motion, show realizing extinguishing arc and information
Function.
The operation principle of the present invention:
When electrical network is properly functioning, one-level switch 1 and secondary switch 2 are gate-dividing state.Work as because of
When lightning flash over causes power distribution network that single-phase arc grounding fault occurs, monitoring unit 6 monitors electricity
There is ANOMALOUS VARIATIONS with opening triangular voltages in pressure transformer 3 secondary side phase voltage, and monitoring unit 6 is first
First passing through fault phase identification program and analyze the secondary side voltage of voltage transformer 3, automatic decision goes out
Fault phase, sends reclosing command to one-level switch 1 and secondary switch 2 the most successively.The most such as
Really fault phase correct judgment, the high-voltage switch gear that one-level switch 1 is connected on fault phase closes a floodgate, then
Being applied to the voltage on voltage sampling unit 4 is faulted phase voltage (less than fault-free phase voltage)
Being low-voltage, during low-voltage, secondary switch 2 does not has locking, receives the instruction of monitoring unit 6
Can realize closing a floodgate, so that bus-bar fault phase and ground net couples, because ground network ground resistance is much smaller than
Line fault point earth resistance, the line fault point power frequency continued flow overwhelming majority is divided to earth mat,
Residue residual flow is the least, arc extinction after current over-zero, and power frequency continued flow all forms loop through earth mat,
Realizing electric current transfer, after time delay Δ t (several seconds), trouble point air insulation has been restored,
Monitoring unit 6 sends instruction again, controls one-level switch 1 and secondary switch 2 separating brake, whole disappears
Arc process completes, and electrical network can recover properly functioning, and now arc-extinction device returns to original state.
If fault phase misjudgment, monitoring unit 6 sends instruction, controls one-level switch 1 even
After the high-voltage switch gear combined floodgate being connected on the fault phase that program judges, because being applied to voltage sampling unit
Voltage on 4 be healthy phases voltage (more than phase voltage) be high voltage, due to high-tension
Existing, secondary switch 2 is in blocking, even if therefore secondary switch 2 receives combined floodgate and refers to
Order, also can not close a floodgate in tripping, thus avoids fault phase erroneous judgement to cause phase fault accident.Time delay
After Δ t (several seconds), monitoring unit 6 sends instruction control one-level switch 1 again and secondary switch divides
Lock, whole arc-extinction device returns to original state, restarts signals collecting, fault phase identification
Program is controlled with arc-extinction device.
The fault current of arc-extinction device is flow through in the secondary side signal reflection of current transformer 5, its number
Show according to collection and information and completed by monitoring unit 6.
The above, the only detailed description of the invention of the present invention, but protection scope of the present invention is also
Being not limited to this, any those skilled in the art of belonging to are at the technology model that the invention discloses
In enclosing, the change that can readily occur in or replacement, all should contain within protection scope of the present invention.
Therefore, protection scope of the present invention should be as the criterion with scope of the claims.
Claims (8)
1. a power distribution network arc-extinction device, it is characterised in that: include one-level switch (1), two
Level switch (2), voltage transformer (3), voltage sampling unit (4), current transformer (5),
Monitoring unit (6) and high-tension fuse (7), described voltage transformer (3) string high-voltage fuse
Disconnected device (7) is connected between bus and earth mat；Described one-level switch (1) is three single-phase height
Compressing switch, described secondary switch (3) is a single-phase high voltage switch, one-level switch (1)
The high-pressure side of three single-phase high voltage switches couples with three-phase bus, respectively with two after low-pressure end parallel connection
The high-pressure side of level switch (2) is connected, the low-pressure end string current transformer of secondary switch (2)
(5) coupling with earth mat, voltage sampling unit (4) is connected on the high-pressure side of secondary switch (2)
And between current transformer (5), monitoring unit (6) is used for obtaining voltage transformer (3)
The secondary side phase voltage of output and open triangular voltages, voltage sampling unit (4) exports two grades
Voltage between high-pressure side and the earth mat of switch (2) and the warp monitored of current transformer (5)
Earth mat forms the electric current in loop, and according to the secondary side phase voltage of voltage transformer (3), open
Triangular voltages is monitored and analyzed and draws breakdown judge result, exports according to breakdown judge result
Point, reclosing command, control one-level switch (1) and secondary switch (2) action.
2. power distribution network arc-extinction device as claimed in claim 1, it is characterised in that: described list
Phase high-voltage switch gear is pressure, and grade is identical with distribution network voltage grade.
3. power distribution network arc-extinction device as claimed in claim 1, it is characterised in that: described electricity
The pressure grade of pressure transformer (3) is identical with distribution network voltage grade, described voltage transformer
(3) with secondary side phase voltage winding and open triangle winding.
4. power distribution network arc-extinction device as claimed in claim 1, it is characterised in that: described electricity
Pressure sampling unit (4) is used for the voltage obtaining between high-pressure side and the earth mat of secondary switch (2),
Described voltage sampling unit (4) is high-voltage bleeder or single-phase potential transformer, pressure grade
Identical with distribution network voltage grade.
5. power distribution network arc-extinction device as claimed in claim 1, it is characterised in that: described height
The electric pressure of pressure fuse (7) is identical with distribution network voltage grade.
6. power distribution network arc-extinction device as claimed in claim 1, it is characterised in that: described prison
Control unit (6) is additionally operable to show voltage x current data and status information, described voltage x current number
According to include secondary side phase voltage that voltage transformer (3) exports and open triangular voltages, voltage takes
The voltage at secondary switch (2) two ends that sample unit (4) exports and current transformer (5)
The loop current value of output, described status information includes separate, the one-level switch motion of fault phase
Instruction execution state, secondary switch instruction execution state.
7. the device utilized according to any one of claim 1-6 carries out power distribution network extinguishing arc
Method, it is characterised in that: monitoring unit (6) obtain voltage transformer (3) export two
Secondary side phase voltage and open triangular voltages, and carry out data analysis, when power distribution network generation arc grounding
During fault, secondary side phase voltage and open triangular voltages generation ANOMALOUS VARIATIONS, monitoring unit (6)
Judge fault phase by fault phase identification program, and send instruction, control one-level switch (1)
Perform feed motion with secondary switch (2), after time delay certain time, send separating brake instruction,
Control one-level switch and secondary switch performs separating brake action, thus complete arc eliminator.
8. the method for power distribution network extinguishing arc as claimed in claim 7, it is characterised in that: if
Monitoring unit (6) fault phase correct judgment, the height that one-level switch (1) is connected on fault phase
Compress switch combined floodgate, then the voltage being applied on voltage sampling unit (4) is that faulted phase voltage is
Low-voltage, during low-voltage, secondary switch (2) does not has locking, receives monitoring unit (6)
Instruction can realize closing a floodgate, so that bus-bar fault phase and ground net couples, after time delay certain time,
Trouble point air insulation is recovered, and monitoring unit (6) sends instruction again, controls one-level switch (1)
With secondary switch (2) separating brake；If fault phase misjudgment, monitoring unit (6) sends finger
Order, controls the high-voltage switch gear combined floodgate that one-level switch (1) is connected on the fault phase that program judges
After, the voltage because being applied on voltage sampling unit (4) be healthy phases voltage be high voltage,
Secondary switch (2) is in blocking, and secondary switch (2) receives reclosing command can tripping
Do not close a floodgate, to avoid fault phase erroneous judgement to cause phase fault accident, after time delay certain time, prison
Control unit (6) sends instruction again and controls one-level switch (1) and secondary switch (2) separating brake.
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| CN201610464248.2A CN105932658B (en) | 2016-06-23 | 2016-06-23 | A kind of method that power distribution network extinguishing arc is carried out using power distribution network arc-extinction device |
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| CN201610464248.2A CN105932658B (en) | 2016-06-23 | 2016-06-23 | A kind of method that power distribution network extinguishing arc is carried out using power distribution network arc-extinction device |
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| CN105932658B CN105932658B (en) | 2017-12-05 |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106877307A (en) * | 2017-03-08 | 2017-06-20 | 安徽天电气技术股份有限公司 | Sofe Switch arc-extinction device |
| CN109521332A (en) * | 2018-12-19 | 2019-03-26 | 国网北京市电力公司 | Fault handling method, apparatus and system |
| CN109802377A (en) * | 2017-11-17 | 2019-05-24 | 天津平高智能电气有限公司 | A kind of transfevent ground connection arc-extinction device |
| CN110389276A (en) * | 2019-08-06 | 2019-10-29 | 安徽凯川电力保护设备有限公司 | A kind of singlephase earth fault management system and method |
| CN110401179A (en) * | 2019-06-21 | 2019-11-01 | 国网江苏省电力有限公司泰州供电分公司 | A kind of low voltage power transmission net self- recoverage shock resistance structure |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201054497Y (en) * | 2007-06-26 | 2008-04-30 | 孙嘉宁 | Resonance and arc-elimination integrated device for neutral non-valid ground mesh |
| US20090147414A1 (en) * | 2007-12-06 | 2009-06-11 | David Lazarovich | Ground fault detection in an ungrounded electrical system |
| CN201312112Y (en) * | 2008-12-03 | 2009-09-16 | 徐成飞 | Overvoltage monitoring and comprehensive protective device for medium voltage power network |
| CN201430438Y (en) * | 2009-03-27 | 2010-03-24 | 淮南矿业(集团)有限责任公司 | Arc-extinguishing device |
| CN205693353U (en) * | 2016-06-23 | 2016-11-16 | 国家电网公司 | A kind of power distribution network arc-extinction device |
-
2016
- 2016-06-23 CN CN201610464248.2A patent/CN105932658B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201054497Y (en) * | 2007-06-26 | 2008-04-30 | 孙嘉宁 | Resonance and arc-elimination integrated device for neutral non-valid ground mesh |
| US20090147414A1 (en) * | 2007-12-06 | 2009-06-11 | David Lazarovich | Ground fault detection in an ungrounded electrical system |
| CN201312112Y (en) * | 2008-12-03 | 2009-09-16 | 徐成飞 | Overvoltage monitoring and comprehensive protective device for medium voltage power network |
| CN201430438Y (en) * | 2009-03-27 | 2010-03-24 | 淮南矿业(集团)有限责任公司 | Arc-extinguishing device |
| CN205693353U (en) * | 2016-06-23 | 2016-11-16 | 国家电网公司 | A kind of power distribution network arc-extinction device |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106877307A (en) * | 2017-03-08 | 2017-06-20 | 安徽天电气技术股份有限公司 | Sofe Switch arc-extinction device |
| CN109802377A (en) * | 2017-11-17 | 2019-05-24 | 天津平高智能电气有限公司 | A kind of transfevent ground connection arc-extinction device |
| CN109521332A (en) * | 2018-12-19 | 2019-03-26 | 国网北京市电力公司 | Fault handling method, apparatus and system |
| CN110401179A (en) * | 2019-06-21 | 2019-11-01 | 国网江苏省电力有限公司泰州供电分公司 | A kind of low voltage power transmission net self- recoverage shock resistance structure |
| CN110401179B (en) * | 2019-06-21 | 2022-03-08 | 国网江苏省电力有限公司泰州供电分公司 | Low-voltage power transmission network self-recovery impact-resistant structure |
| CN110389276A (en) * | 2019-08-06 | 2019-10-29 | 安徽凯川电力保护设备有限公司 | A kind of singlephase earth fault management system and method |
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