CN107154619A - Automatic switchover earthing mode complexes and its automatic switchover earthing method - Google Patents
Automatic switchover earthing mode complexes and its automatic switchover earthing method Download PDFInfo
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- CN107154619A CN107154619A CN201710440842.2A CN201710440842A CN107154619A CN 107154619 A CN107154619 A CN 107154619A CN 201710440842 A CN201710440842 A CN 201710440842A CN 107154619 A CN107154619 A CN 107154619A
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- 230000001629 suppression Effects 0.000 claims abstract description 24
- 230000007935 neutral effect Effects 0.000 claims abstract description 15
- 230000007246 mechanism Effects 0.000 claims abstract description 6
- 238000004804 winding Methods 0.000 claims description 14
- 238000007599 discharging Methods 0.000 claims description 10
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 claims description 5
- 230000001939 inductive effect Effects 0.000 claims description 5
- 229910052710 silicon Inorganic materials 0.000 claims description 5
- 239000010703 silicon Substances 0.000 claims description 5
- 230000008859 change Effects 0.000 claims description 3
- 238000001514 detection method Methods 0.000 claims description 3
- 239000007787 solid Substances 0.000 claims description 3
- 229910001256 stainless steel alloy Inorganic materials 0.000 claims description 3
- 230000015572 biosynthetic process Effects 0.000 claims description 2
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Classifications
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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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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H3/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
- H02H3/08—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to excess current
- H02H3/10—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to excess current additionally responsive to some other abnormal electrical conditions
- H02H3/105—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to excess current additionally responsive to some other abnormal electrical conditions responsive to excess current and fault current to earth
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Abstract
The present invention relates to a kind of automatic switchover earthing mode complexes and its automatic switchover earthing method.It solves the problems such as existing neutral node earthing mode is single.Including controller, parallel connection is connected to resistance-grounded system structure, gap ground structure, is directly grounded structure and grounding through arc structure controller respectively, resistance-grounded system structure includes the controllable small resistor being in series by small resistor and vacuum contactor, the disconnecting switch that structure includes being used to control neutral point of electric network to be directly grounded is directly grounded, disconnecting switch is connected with motor-operating mechanism.Advantage is：Employ a kind of earthing mode that grounding through arc, low resistance grounding are unified with earth-free mode, used for user according to grid operating conditions selection, it is in parallel with arc suppression coil, disconnecting switch, gap primary side using small resistor, control the division of the transferring the files of arc suppression coil, the switching of small resistor and disconnecting switch to realize the selection of several earthing modes by controller.
Description
Technical field
The invention belongs to power supply unit technical field, more particularly, to a kind of automatic switchover earthing mode complexes and its
Automatic switchover earthing method.
Background technology
Most of current China 6kV~35kV power distribution networks use small current neutral grounding mode and isolated neutral mode, i.e.,
Neutral non-effective grounding mode and isolated neutral mode.With the quickening of urban construction paces, city framework is continuous
Widen, city medium voltage network scale also increases therewith, along with a large amount of uses of power cable line in recent years, medium voltage network system
The capacitance current level of system is sharply increased, and this brings some problems to the operation of power network.Single-phase earthing causes medium voltage network
Failure and exception, the features such as with multiple, shielding, popularity, Unpredictability and diversity, should give great attention,
Find out reason and work out measures and solve.The neutral grounding mode of middle voltage distribution networks mainly has several, using low resistance grounding,
It is grounding through arc, earth-free.Several earthing modes have the merits and demerits of itself, for example, grounding through arc is present
Adjust constant, intelligent low problem.
In order to solve the problem of prior art is present, people have carried out long-term exploration, it is proposed that miscellaneous solution
Scheme.For example, Chinese patent literature discloses a kind of arc suppression coil device and its arc extinguishing method [application number：
201510732831.2], wherein arc suppression coil device includes arc suppression coil, and one end of arc suppression coil is grounded, and the other end is opened with one
One end electrical connection of module is closed, the other end of switch module is output end；Also include and connecting resistance, and connect electricity one end ground connection,
The other end with and connect input switch one end be connected, and connect input switch the other end be connected with output end.Present invention input makes
Used time, the neutral point of output end and power network is connected together.When single-phase earthing occurs for power network, switch module is in electric network capacitance and current
Increase when, quickly arc suppression coil is linked together with neutral point, quickly go weaken power network asymmetrical voltage.Disappearing
Arc coil was accessed after a period of time, when residual voltage is not zero in power network, and connect input switch closure will and connecting resistance with
Property point connect together, go eliminate residual voltage.
The problem of such scheme solves existing neutral grounding mode regulation inconvenience to a certain extent, but the program
Still exist：Earthing mode is single, it is impossible to the problem of using a variety of earthing modes according to grid operating conditions selection.
The content of the invention
Regarding the issue above, the present invention provides a kind of simple and reasonable, a variety of earthing modes combinations from
Dynamic switching earthing mode complexes.
Another object of the present invention is high automatic of automaticity in view of the above-mentioned problems, provide a kind of simple to operate
Switch earthing method.
To reach above-mentioned purpose, present invention employs following technical proposal：This automatic switchover earthing mode complexes, bag
Include controller, it is characterised in that described controller respectively parallel connection be connected to resistance-grounded system structure, gap ground structure, directly
Ground structure and grounding through arc structure, described resistance-grounded system structure include being connected by small resistor and vacuum contactor
Controllable small resistor, it is described to be directly grounded the disconnecting switch that structure includes being used to control neutral point of electric network to be directly grounded,
Described disconnecting switch, which is connected with, to be connected with controller and for the motor-operating mechanism for the on/off switch for realizing disconnecting switch.
In above-mentioned automatic switchover earthing mode complexes, described grounding through arc structure disappears including turn-adjusting
Some taps, and the different number of turn of each tap correspondence are respectively equipped with arc coil, described turn-adjusting arc-extinguishing winding,
And be equipped with each tap and can realize to have and carry switching gear and have load motor switch so as to change inductive current.
In above-mentioned automatic switchover earthing mode complexes, described small resistor is made up of stainless steel alloy, and institute
The small resistor stated is connected with controller.
In above-mentioned automatic switchover earthing mode complexes, described gap ground structure includes in parallel with controller
At least one vacuum contactor, and described control are in series with the discharging gap connect, the gap loop of described discharging gap
Device is connected with vacuum contactor, and described vacuum contactor is connected with arrester.
In above-mentioned automatic switchover earthing mode complexes, if being connected with turn on described turn-adjusting arc-extinguishing winding
Dry parallel resistance, and described parallel resistance is connected with silicon controlled component.
In above-mentioned automatic switchover earthing mode complexes, described turn-adjusting arc-extinguishing winding and voltage transformer phase
Even, described voltage transformer is connected by disconnecting switch with the once row of connection, and described once connection row and ground connection transformation
Device is connected.
In above-mentioned automatic switchover earthing mode complexes, described discharging gap passes through resistor and Current Mutual Inductance
Device is connected.
In above-mentioned automatic switchover earthing mode complexes, the number of the tap on described turn-adjusting arc-extinguishing winding
Measure as 5-25.
The automatic switchover earthing method of above-mentioned automatic switchover earthing mode complexes is as described below：This automatic switchover connects
Ground method, it is characterised in that this method includes：
A, arc suppression coil and small resistor unification earthing mode：When earth fault occurs for power distribution network, connect by arc suppression coil
Ground structure and resistance-grounded system structure synthesis set of device detection electric network capacitance and current value need the inductance compensated electric to calculate
Stream, control arc suppression coil output compensation electric current；
B, with gap ground and it is directly grounded unification earthing mode：Gap ground structure and it is directly grounded structure and belongs to big electricity
Earthed system is flowed, by neutral-point solid ground, when occurring singlephase earth fault, earth short circuit current is very big, jumps breaker
Lock cuts off failure.
Compared with prior art, the advantage of this automatic switchover earthing mode complexes and its automatic switchover earthing method
It is：It is simple in construction, a kind of earthing mode that grounding through arc, low resistance grounding are unified with earth-free mode is employed, is supplied
User uses according to grid operating conditions selection.It is in parallel with arc suppression coil, disconnecting switch, gap primary side using small resistor, lead to
The division of controller control the transferring the files of arc suppression coil, the switching of small resistor and disconnecting switch is crossed to realize the choosing of several earthing modes
Select.
Brief description of the drawings
The structural representation that Fig. 1 provides for the present invention.
The structural representation at another visual angle that Fig. 2 provides for the present invention.
The theory diagram that Fig. 3 provides for the present invention.
In figure, controller 1, resistance-grounded system structure 2, small resistor 21, vacuum contactor 22, gap ground structure 3, electric discharge
Gap 31, arrester 32, be directly grounded structure 4, disconnecting switch 41, motor-operating mechanism 42, grounding through arc structure 5, adjust
Circle formula arc suppression coil 51, tap 52, there are load motor switch 53, parallel resistance 6, silicon controlled component 7, voltage transformer 8, once
Connection row 81, resistor 9, current transformer 91.
Embodiment
The present invention will be further described in detail with reference to the accompanying drawings and detailed description.
As Figure 1-3, this automatic switchover earthing mode complexes, including controller 1, controller 1 respectively and couple
There are resistance-grounded system structure 2, gap ground structure 3, be directly grounded structure 4 and grounding through arc structure 5, resistance-grounded system
Structure 2 includes the controllable small resistor being in series by small resistor 21 and vacuum contactor 22, and being directly grounded structure 4 includes being used to control
The disconnecting switch 41 that neutral point of electric network processed is directly grounded, disconnecting switch 41, which is connected with, to be connected with controller 1 and isolates for realizing
The motor-operating mechanism 42 of the on/off switch of switch 41, the design mainly employs grounding through arc, low resistance grounding with not connecing
A kind of earthing mode that ground mode is unified, is used for user according to grid operating conditions selection.Using small resistor and arc suppression coil,
Disconnecting switch, gap primary side are in parallel, and the transferring the files of arc suppression coil, the switching of small resistor and disconnecting switch are controlled by controller
The selection of several earthing modes is realized in division.
Wherein, grounding through arc structure 5 here includes dividing on turn-adjusting arc-extinguishing winding 51, turn-adjusting arc-extinguishing winding 51
She You not some taps 52, and the different numbers of turn of each tap 52 correspondence, and energy is equipped with each tap 52
Realize to have and carry switching gear so that changing having for inductive current carries motor switch 53, grounding through arc is exactly by systems
Property point access arc suppression coil, inductance current is provided when single-phase earthing occurs for system, to compensate because system has electric capacity
In capacitive earth current caused by trouble point, the fault ground electric current of system is set to reach minimum.System single-phase earth fault may be used also
To run 2 hours, so power supply reliability of the transformer neutral point through grounding through arc mode is higher, it is not easy to have a power failure.Also
Line selection device for low current can be configured, can tripping faulty line in a short time when occurring singlephase earth fault.
Wherein, resistance eutral grounding here is exactly to access resistor by property point in systems, when occurring single-phase earthing, failure
Circuit can produce a larger fault current, and configuration zero-sequencedirectional protection has good sensitivity, can rapidly cut off and connect
Ground circuit, but must must cut off faulty grids in 10s, should not can burn-out resistance device.When single-phase fault occurs for single system, nothing
By being permanent or instantaneity, tripping operation is acted on, therefore line tripping number of times is more, has a strong impact on the normal power supply of user,
The reliability decrease for making it power, it is preferable that small resistor 21 here is made up of stainless steel alloy, and small resistor 21 and controller
1 is connected.
Preferably, gap ground structure 3 here includes and controller 1 and the discharging gap 31 that couples, discharging gap 31
Gap loop on be in series with least one vacuum contactor 22, and controller 1 is connected with vacuum contactor 22, vacuum contactor
22 are connected with arrester 32, are connected with some parallel resistances 6, and parallel resistance on turn-adjusting arc-extinguishing winding 51 here in turn
6 are connected with silicon controlled component 7, and turn-adjusting arc-extinguishing winding 51 is connected with voltage transformer 8, and voltage transformer 8 passes through disconnecting switch
41 are connected with the once row of connection 81, and once connection row 81 is connected with grounding transformer 82, and discharging gap 31 passes through the He of resistor 9
Current transformer 91 is connected.
Further, grounding transformer here：For 10kV power distribution networks, because Transformer Winding is △, it is necessary to use ground connection
Transformer manufacturing neutral point.For reduction zero sequence impedance, grounding transformer uses Z-shaped wiring, should as needed can be with appropriate two
Secondary capacity is become with replacement station.Arc suppression coil is actually a kind of single-phase iron-core reactor, by the coil turn for changing winding
Number changes inductance, and inductance value and the number of turn square are directly proportional.Therefore, the quantity of the tap 52 on turn-adjusting arc-extinguishing winding 51
For 5-25, the different number of turn of correspondence, with there is load motor switch to adjust tap, can be achieved to carry switching gear, so as to change
Become inductive current.Loaded switch is driven to adjust the size of arc suppression coil compensation capacitance current by control flow output control signal.
In parallel gap, one vacuum contactor of circuit in series in gap, by controller come the switching of control contactor come between realizing
The use in gap loop.
This automatic switchover earthing method, including：A, arc suppression coil and small resistor unification earthing mode：When power distribution network connects
It is 2-in-1 into set of device detection electric network capacitance and current value by grounding through arc structure 5 and resistance-grounded system structure during earth fault
To calculate the inductive current for needing to compensate, control arc suppression coil output compensation electric current；General instantaneity earth fault is by inductance
After current compensation, arc extinction, earth fault is eliminated automatically, then complexes automatically exit from compensating coefficient, and system recovers normal
Operation, causes the high situation of line tripping rate so as to avoid and a faulty tripping operation at once in low resistance grounding mode occur.It is right
Still had in line-to-ground fault after arc suppression coil compensation 10s, then the system, which is believed that, there occurs permanent earth fault,
Complexes can close vacuum contactor input small resistor automatically, and now fault current is larger, can be dynamic by zero-sequence current protection
Make, inlet wire is cut off by switch trip.Put into after small resistor, control Controllable Arc-Suppression Coil System exits compensation, after faulty line excision, is
The normal operation of recovery of uniting, the automatic closed high switch of earthing device exits small resistor, and the input of resistance is realized accurately soon
Fast isolated fault, it is to avoid failure propagation.Integrated treatment of this earthing device for one-phase earthing failure in electric distribution network
Mode, is exported by Controllable Arc-Suppression Coil System for instantaneity line-to-ground fault and compensated so that ground arc can quickly extinguish, solution
Determine the high shortcoming of trip-out rate in low resistance grounding, be the significant improvement to current low resistance grounding mode.
B, with gap ground and it is directly grounded unification earthing mode：Gap ground structure 3 and it is directly grounded structure 4 and belongs to big
Current grounding system, by neutral-point solid ground, when occurring singlephase earth fault, earth short circuit current is very big, makes breaker
Tripping operation excision failure, when using gap ground and be directly grounded device, by controller output signal controlling switch switching.
Specific embodiment described herein is only to spirit explanation for example of the invention.Technology neck belonging to of the invention
The technical staff in domain can be made various modifications or supplement to described specific embodiment or be replaced using similar mode
Generation, but without departing from the spiritual of the present invention or surmount scope defined in appended claims.
Although more used herein controller 1, resistance-grounded system structure 2, small resistor 21, vacuum contactor 22,
Gap ground structure 3, discharging gap 31, arrester 32, it is directly grounded structure 4, disconnecting switch 41, motor-operating mechanism 42, extinguishing arc
Coil ground structure 5, turn-adjusting arc-extinguishing winding 51, tap 52, have load motor switch 53, parallel resistance 6, silicon controlled component 7,
Voltage transformer 8, the once term such as connection row 81, resistor 9, current transformer 91, but be not precluded from using other terms
Possibility.It is used for the purpose of more easily describing and explaining the essence of the present invention using these terms；It is construed as any
A kind of additional limitation is all disagreed with spirit of the present invention.
Claims (9)
1. a kind of automatic switchover earthing mode complexes, including controller (1), it is characterised in that described controller (1) point
Parallel connection is not connected to resistance-grounded system structure (2), gap ground structure (3), is directly grounded structure (4) and grounding through arc knot
Structure (5), described resistance-grounded system structure (2) include by small resistor (21) and vacuum contactor (22) be in series it is controllable small
Resistance, the described structure (4) that is directly grounded includes the disconnecting switch (41) for controlling neutral point of electric network to be directly grounded, described
Disconnecting switch (41), which is connected with, to be connected with controller (1) and for the motor-operating mechanism for the on/off switch for realizing disconnecting switch (41)
(42)。
2. automatic switchover earthing mode complexes according to claim 1, it is characterised in that described arc suppression coil connects
Ground structure (5) includes being respectively equipped with some taps on turn-adjusting arc-extinguishing winding (51), described turn-adjusting arc-extinguishing winding (51)
(52) being equipped with, and the different numbers of turn of each tap (52) correspondence, and on each tap (52) can realize have load to cut
There is load motor switch (53) gear shift position so as to change inductive current.
3. automatic switchover earthing mode complexes according to claim 2, it is characterised in that described small resistor (21)
It is made up of stainless steel alloy, and described small resistor (21) is connected with controller (1).
4. the automatic switchover earthing mode complexes according to Claims 2 or 3, it is characterised in that described gap connects
Ground structure (3) is included with controller (1) and the discharging gap (31) that couple, string on the gap loop of described discharging gap (31)
At least one vacuum contactor (22) is associated with, and described controller (1) is connected with vacuum contactor (22), described vacuum connects
Tentaculum (22) is connected with arrester (32).
5. automatic switchover earthing mode complexes according to claim 2, it is characterised in that described turn-adjusting extinguishing arc
It is connected with some parallel resistances (6) on coil (51) in turn, and described parallel resistance (6) is connected with silicon controlled component (7).
6. automatic switchover earthing mode complexes according to claim 2, it is characterised in that described turn-adjusting extinguishing arc
Coil (51) is connected with voltage transformer (8), and described voltage transformer (8) passes through disconnecting switch (41) and the once row of connection
(81) it is connected, and described once connection row (81) is connected with grounding transformer (82).
7. automatic switchover earthing mode complexes according to claim 4, it is characterised in that described discharging gap
(31) it is connected by resistor (9) summation current transformer (91).
8. automatic switchover earthing mode complexes according to claim 2, it is characterised in that described turn-adjusting extinguishing arc
The quantity of tap (52) on coil (51) is 5-25.
9. the automatic switchover ground connection side of the automatic switchover earthing mode complexes according to any one in claim 1-8
Method, it is characterised in that this method includes：
A, arc suppression coil and small resistor unification earthing mode：When earth fault occurs for power distribution network, pass through grounding through arc knot
Structure (5) and resistance-grounded system structure (2) synthesis set of device detection electric network capacitance and current value need the inductance of compensation to calculate
Electric current, control arc suppression coil output compensation electric current；
B, with gap ground and it is directly grounded unification earthing mode：Gap ground structure (3) and it is directly grounded structure (4) and belongs to big
Current grounding system, by neutral-point solid ground, when occurring singlephase earth fault, earth short circuit current is very big, makes breaker
Tripping operation excision failure.
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN108281945A (en) * | 2018-04-12 | 2018-07-13 | 天津浩源慧能科技有限公司 | It is a kind of based on the singlephase earth fault shielding system and partition method of applying signal outside |
| CN110058060A (en) * | 2019-05-15 | 2019-07-26 | 宁波绵长电子科技有限公司 | A kind of electric appliance automatic protection ground connection operating system |
| 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 |
| CN111682404A (en) * | 2020-06-09 | 2020-09-18 | 广东电网有限责任公司东莞供电局 | 10kV power system neutral point movable small resistor complete grounding device |
| CN111711165A (en) * | 2020-04-21 | 2020-09-25 | 国网安徽省电力有限公司 | Automatic control device of neutral point grounding resistor |
| CN111781464A (en) * | 2020-06-28 | 2020-10-16 | 云南电网有限责任公司电力科学研究院 | Fault positioning system and method for arc suppression coil and small-resistance grounding power grid |
| CN114487969A (en) * | 2022-02-09 | 2022-05-13 | 广东韶钢松山股份有限公司 | Live debugging method and device for composite grounding system |
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| CN111682404A (en) * | 2020-06-09 | 2020-09-18 | 广东电网有限责任公司东莞供电局 | 10kV power system neutral point movable small resistor complete grounding device |
| CN111781464A (en) * | 2020-06-28 | 2020-10-16 | 云南电网有限责任公司电力科学研究院 | Fault positioning system and method for arc suppression coil and small-resistance grounding power grid |
| CN114487969A (en) * | 2022-02-09 | 2022-05-13 | 广东韶钢松山股份有限公司 | Live debugging method and device for composite grounding system |
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