CN206533136U - 220kV transformer stations arc suppression coil parallel low resistance earthed system - Google Patents
220kV transformer stations arc suppression coil parallel low resistance earthed system Download PDFInfo
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- CN206533136U CN206533136U CN201621402460.8U CN201621402460U CN206533136U CN 206533136 U CN206533136 U CN 206533136U CN 201621402460 U CN201621402460 U CN 201621402460U CN 206533136 U CN206533136 U CN 206533136U
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Abstract
The utility model is related to a kind of 220kV transformer stations arc suppression coil parallel low resistance earthed system, including small resistor unit and arc suppression coil unit, and small resistor unit is in parallel with arc suppression coil unit to be followed by into main transformer；Arc suppression coil and small resistor parallel running, when system is normally run, arc suppression coil puts into operation, and small resistor does not put into operation, only when the earth fault for eliminating not fall occurs for system, input small resistor in the short time, for cutting off faulty line.Arc suppression coil will play a role elimination electric arc when on the one hand non-permanent earth fault occurs for the utility model, fundamentally release line fault；On the other hand; this kind of earthing mode being capable of automatic identification permanent fault; failure is once detected; small resistor is put into immediately; coordinate instantaneous excision failure with protective relaying device; shorten fault time as far as possible, the probability that reduction phase fault accident occurs, it is ensured that the safe and stable operation of whole system.
Description
Technical field
The utility model is related to a kind of neutral grounding mode, and in particular to a kind of 220kV transformer stations arc suppression coil is in parallel
Small resistance grounding system, when system is normally run, small resistor does not put into operation, only occurs the ground connection event for eliminating not fall in system
During barrier, input small resistor in the short time, for cutting off faulty line.
After faulty line excision, small resistor controller can cut off small resistor automatically according to setting time, and system is recovered just
Normal running status.
Background technology
The Power Network Neutral of world's every country is not fully identical, and the neutral point in country variant and area connects
Ground mode is mainly [1] determined according to respective power network overall structure and practical operation situation.For different voltage class
Power network, earthing mode that different regions are used and the power network layout characteristics, self-growth situation, circuit operation side of itself
The factors such as formula, manufacture level and natural environment (such as thunderstorm weather) are closely bound up.
American electricity Grids use be directly grounded or through low resistance, the neutral point effective grounding mode of low reactance always；Russia
What is used mostly is still the method for operation of neutral by arc extinction coil grounding；, can be according to power network certainly in Japanese 66kV power distribution network
The earthing mode through resistance, reactance and arc suppression coil is respectively adopted in the difference of body situation, and 220kV network system is used through electricity
The earthing mode of resistance.
In summary, be that external medium voltage network neutral ground is used through grounding through arc and resistance grounded two kinds
Major way, the determination of concrete scheme can have differences according to the difference of conventional operating experience and regional actual electric network situation,
The current application precedent still without arc suppression coil parallel low resistance earthed system.
Utility model content
In order to solve the deficiencies in the prior art, the utility model provides that a kind of safe and cost is low, is quick on the draw
220kV transformer stations arc suppression coil parallel low resistance earthed system, be connected with 220kV main transformers, be commonly used in 220kV power transformations
Stand, such transformer station is conventional equipped with protective relaying device, and the earthed system includes small resistor unit and arc suppression coil unit, uses
In distribution system neutral ground.Described small resistor unit includes fling-cut switch and small resistor, is grounded after the two series connection, switching
The access and excision of switch control small resistor；
Described arc suppression coil unit includes breaker, arc suppression coil, damping resistance, breaker and arc suppression coil, damping
It is grounded after resistance three series connection；
Small resistor unit is in parallel with arc suppression coil unit to be followed by into main transformer；Arc suppression coil and small resistor parallel running,
When system is normally run, arc suppression coil puts into operation, and small resistor does not put into operation, and the ground connection for eliminating not fall only occurs in system
During failure, input small resistor in the short time, for cutting off faulty line..
Further, voltage transformer is set in the present system, it is in parallel with small resistor unit and arc suppression coil unit, to survey
Determine the magnitude of voltage of neutral point.
Further, one current transformer is set at arc suppression coil unit ground connection position, to determine zero-sequence fault electric current.
The beneficial effects of the utility model：
The utility model has advantages below：
(1) security reliability and continuity of power supply
Through arc suppression coil and small resistance grounding system, the arc suppression coil when occurring transient earthing failure will be played neutral point
Electric arc is eliminated in effect, fundamentally releases line fault；This kind of earthing mode being capable of automatic identification permanent fault, failure simultaneously
Once being detected, small resistor is put into immediately, with protective relaying device, is coordinated transient solution to remove failure, is shortened failure as far as possible
Time, the probability that reduction phase fault accident occurs, it is ensured that the safe and stable operation of whole system.Relay described here is protected
Protection unit is the protection device that transformer station routinely matches somebody with somebody.
(2) dielectric level of electrical equipment and circuit
Earthed system of the neutral point through arc suppression coil and small resistor, inductance current can compensate certain capacity current, compensate
It is more thorough, operation of power networks will be run closer to resonant frequency, and the numerical value of the arc overvoltage of generation will be lower, accordingly
Apparatus insulated level requirement is also decreased, grid equipment cost is saved.
(3) selectivity and sensitivity of relay protection
Mode of the neutral point through arc suppression coil and low resistance grounding can draw warp well by instantaneously accessing small resistor
Relay equipment selectivity preferably advantage in small resistance grounding system.
Brief description of the drawings
Fig. 1 is structural representation of the present utility model；
Embodiment
In order that the purpose of this utility model, technical scheme and advantage are more clearly understood, below in conjunction with the accompanying drawings and implement
Example, the utility model is further elaborated.It should be appreciated that specific embodiment described herein is used only for explaining
The utility model, is not used to limit the utility model.
The technical program proposes a kind of 220kV transformer stations arc suppression coil parallel low resistance earthed system, with 220kV main transformers
Depressor 1 is connected, and main transformer 1 is with being provided with a disconnecting link 2. in the middle of the present apparatus
As shown in figure 1, including small resistor unit and arc suppression coil unit, small resistor unit includes fling-cut switch 3 and small electricity
Resistance 4, the two ground connection that is cascaded, fling-cut switch 3 controls the access and excision of small resistor 4；Arc suppression coil unit includes open circuit
Device 5, arc suppression coil 6 and damping resistance 7, breaker 5 are grounded after being connected with arc suppression coil 6, damping resistance 7.Small resistor unit with
Arc suppression coil unit parallel connection is followed by into main transformer 1, and transformer station here is routinely equipped with protective relaying device, mainly for the protection of
Arc suppression coil 6.
Further, voltage transformer 8 is set in the present system, it is in parallel with small resistor unit and arc suppression coil unit, come
Determine the magnitude of voltage of neutral point.
Further, one current transformer 9 is set at arc suppression coil unit ground connection position, to determine zero-sequence fault electric current.
Simultaneously low resistance grounding mode just refers to arc suppression coil 6 and the parallel running of small resistor 4 to arc suppression coil, and system is normally run
When, arc suppression coil 6 puts into operation, and small resistor 4 does not put into operation, short only when the earth fault for eliminating not fall occurs for system
Input small resistor 4 in time, for cutting off faulty line.
In the present system, the switch 3 of small resistor unit is connected with a controller, controller be used for the logical of controlling switch 3 or
Disconnected, after faulty line is cut off, controller can cut off small resistor 4 automatically according to setting time, and system recovers normal operation shape
State.
When system is normally run, arc suppression coil 6 is put into operation, and small resistor 4 is not put into then, and the switching in the loop of small resistor 4 is opened
3 are closed to disconnect.When single phase grounding fault occurs for system, the capacitance current in the meeting self compensating system of arc suppression coil 6.If
Earth fault is instantaneity earth fault, and ground connection disappears quickly, and system reverts to normal operating condition, whole process small resistor 4
It is failure to actuate；If earth fault does not disappear, it can determine that as permanent earth fault, now, after the delay t1 times, delay time
0.5s-2s can be set, and put into small resistor 4, making time is t2, and 0.5s-2s can be set, and coordinate protective relaying device excision fault wire
Road.Now, system can monitor the running status of neutral point in real time, and neutral point voltage is determined by voltage transformer 11, if electric
Pressure recovers normal, and explanation action is normal, and faulty line has tripped, then controller cuts off small resistor 4 automatically, and system is returned to just
Normal running status；If neutral point voltage is still very high, after t2 setting times, it is believed that system trip device is abnormal, fault wire
Road is not tripped, now, for protection small resistor device, and controller cuts off small resistor 4 automatically, while the abnormality alarming that trips.
Power system occurs after earth fault, neutral point voltage rise.According to the difference of earthing type, voltage elevation amplitude
Difference, peak is phase voltage.Controller using voltage transformer secondary voltage 20V as ground connection alarm threshold, more than i.e. be judged to connect
Ground occurs.Because partial earthing is transient earthing, it can die away, therefore now small resistor 4 is not put into.
After earth fault occurs, if permanent earth fault, then with regard to close circuit breaker 5, the corresponding ground connection of input
Small resistor 4.If zero-sequence fault current value is sufficiently large, then protective relaying device will be acted in time, the faulty line is cut off,
Earth fault pop-off.But in the case of high resistance grounding, zero-sequence fault electric current may be unable to reach relay protection dress
The setting valve put, causes relay protection to act, now, the part can as the system back-up protection, find out
Occur the circuit of short circuit grounding failure, and send alarm prompt, to ensure that power system safe and stable can be run.
If earth fault disappears, all go well, power department can be overhauled to faulty line；If earth fault does not have
Disappear, be grounded certain time, no more than 10 seconds, ground connection small resistor 4 was probably burned off.Therefore no matter earth fault is
No to disappear, input small resistor 4 continues after t2 seconds (can set), excision ground connection small resistor 4, can effectively prevent small resistor 4 from burning.
The earthing mode, which is combined, to be grounded through arc suppression coil 6 and through the respective advantage of both earthing modes of small resistor 4：Instantaneously
Property ground connection by arc suppression coil 6 automatically compensate, only when occur permanent earth when, just in short-term it is interior input small resistor 4, automatically cut off
Faulty line.So, occur that during instantaneity earth fault faulty line need not be cut off, also would not continually have a power failure, influence
User's normal electricity consumption, it is ensured that the reliability of system power supply；For permanent earth fault, quick input small resistor in the short time
4, coordinate excision earth fault line with relay protection device, so as to ensure that equipment, circuit can be with safe and stable operations.According to preceding
Small resistor 4 designed by the control flow of text automatically accesses control device and developed by southern auspicious relay protection, with to the He of arc suppression coil 6
Small resistor 4 carries out Comprehensive Control.
Preferred embodiment of the present utility model is the foregoing is only, it is all at this not to limit the utility model
Any modifications, equivalent substitutions and improvements made within the spirit and principle of utility model etc., should be included in the utility model
Protection domain within.
Claims (3)
1. a kind of 220kV transformer stations arc suppression coil parallel low resistance earthed system, it is characterised in that：Connect with 220kV main transformers
Connect, be commonly used in the conventional 220kV transformer stations equipped with protective relaying device, including small resistor unit and arc suppression coil unit；
Described small resistor unit includes fling-cut switch and small resistor, is grounded after the two series connection, fling-cut switch control small resistor
Access is also connected with excision, the fling-cut switch with a controller, and controller is used for the on-off of controlling switch, works as faulty line
After excision, controller can cut off small resistor automatically according to setting time, and system recovers normal operating condition；
Described arc suppression coil unit includes breaker, arc suppression coil, damping resistance, breaker and arc suppression coil, damping resistance
It is grounded after three's series connection；
Small resistor unit is in parallel with arc suppression coil unit to be followed by into main transformer；Arc suppression coil and small resistor parallel running, system
During normal operation, arc suppression coil puts into operation, and small resistor does not put into operation, and the earth fault for eliminating not fall only occurs in system
When, short time interior input small resistor, for cutting off faulty line.
2. a kind of 220kV transformer stations arc suppression coil parallel low resistance earthed system as claimed in claim 1, it is characterised in that：
Voltage transformer is set in the present system, it is in parallel with small resistor unit and arc suppression coil unit, to determine the magnitude of voltage of neutral point.
3. a kind of 220kV transformer stations arc suppression coil parallel low resistance earthed system as claimed in claim 1, it is characterised in that：
One current transformer is set at arc suppression coil unit ground connection position, to determine zero-sequence fault electric current.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201621402460.8U CN206533136U (en) | 2016-12-20 | 2016-12-20 | 220kV transformer stations arc suppression coil parallel low resistance earthed system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201621402460.8U CN206533136U (en) | 2016-12-20 | 2016-12-20 | 220kV transformer stations arc suppression coil parallel low resistance earthed system |
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|---|---|
| CN206533136U true CN206533136U (en) | 2017-09-29 |
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| CN201621402460.8U Active CN206533136U (en) | 2016-12-20 | 2016-12-20 | 220kV transformer stations arc suppression coil parallel low resistance earthed system |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108879645A (en) * | 2018-07-04 | 2018-11-23 | 国网辽宁省电力有限公司电力科学研究院 | A kind of arc suppression coil and pro-active intervention arc-extinction device paired running device and method |
| CN109672164A (en) * | 2019-02-22 | 2019-04-23 | 国网湖北省电力有限公司电力科学研究院 | A kind of arc suppression coil parallel low resistance distribution net work earthing fault processing method |
| CN110086160A (en) * | 2019-04-29 | 2019-08-02 | 广东电网有限责任公司 | A kind of residue current of ground fault in electrical removing method of neutral by arc extinction coil grounding system |
| CN110148931A (en) * | 2019-06-05 | 2019-08-20 | 南方电网科学研究院有限责任公司 | Arc suppression coil parallel connection low-resistance grounding device and control method |
| CN111327036A (en) * | 2020-04-23 | 2020-06-23 | 安徽广祺智能电器股份有限公司 | Data networking monitoring grounding becomes arc suppression coil parallel connection small resistance integrated equipment |
| CN111693890A (en) * | 2020-04-26 | 2020-09-22 | 国网浙江省电力有限公司 | System and method for processing single-phase earth fault of power distribution network |
| CN113746074A (en) * | 2021-07-19 | 2021-12-03 | 许继电气股份有限公司 | Transformer substation bus grounding system and control method thereof |
| CN114280415A (en) * | 2021-12-14 | 2022-04-05 | 国网江苏省电力有限公司常州供电分公司 | Power distribution network ground fault processing method based on parallel resistors of arc suppression coils |
-
2016
- 2016-12-20 CN CN201621402460.8U patent/CN206533136U/en active Active
Cited By (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108879645A (en) * | 2018-07-04 | 2018-11-23 | 国网辽宁省电力有限公司电力科学研究院 | A kind of arc suppression coil and pro-active intervention arc-extinction device paired running device and method |
| CN109672164A (en) * | 2019-02-22 | 2019-04-23 | 国网湖北省电力有限公司电力科学研究院 | A kind of arc suppression coil parallel low resistance distribution net work earthing fault processing method |
| CN109672164B (en) * | 2019-02-22 | 2020-01-21 | 国网湖北省电力有限公司电力科学研究院 | Method for processing ground fault of arc suppression coil parallel small-resistance power distribution network |
| CN110086160A (en) * | 2019-04-29 | 2019-08-02 | 广东电网有限责任公司 | A kind of residue current of ground fault in electrical removing method of neutral by arc extinction coil grounding system |
| CN110086160B (en) * | 2019-04-29 | 2021-05-14 | 广东电网有限责任公司 | Method for eliminating residual current of ground fault of neutral point arc suppression coil grounding system |
| CN110148931A (en) * | 2019-06-05 | 2019-08-20 | 南方电网科学研究院有限责任公司 | Arc suppression coil parallel connection low-resistance grounding device and control method |
| CN110148931B (en) * | 2019-06-05 | 2021-01-08 | 南方电网科学研究院有限责任公司 | Arc suppression coil parallel low-resistance grounding device and control method |
| CN111327036A (en) * | 2020-04-23 | 2020-06-23 | 安徽广祺智能电器股份有限公司 | Data networking monitoring grounding becomes arc suppression coil parallel connection small resistance integrated equipment |
| CN111327036B (en) * | 2020-04-23 | 2022-03-29 | 安徽广祺智能电器股份有限公司 | Data networking monitoring grounding becomes arc suppression coil parallel connection small resistance integrated equipment |
| CN111693890A (en) * | 2020-04-26 | 2020-09-22 | 国网浙江省电力有限公司 | System and method for processing single-phase earth fault of power distribution network |
| CN113746074A (en) * | 2021-07-19 | 2021-12-03 | 许继电气股份有限公司 | Transformer substation bus grounding system and control method thereof |
| CN114280415A (en) * | 2021-12-14 | 2022-04-05 | 国网江苏省电力有限公司常州供电分公司 | Power distribution network ground fault processing method based on parallel resistors of arc suppression coils |
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