CN201138751Y - Earthing set equipment combining power grid controllable reaction with small resistance - Google Patents
Earthing set equipment combining power grid controllable reaction with small resistance Download PDFInfo
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- CN201138751Y CN201138751Y CNU2007200612732U CN200720061273U CN201138751Y CN 201138751 Y CN201138751 Y CN 201138751Y CN U2007200612732 U CNU2007200612732 U CN U2007200612732U CN 200720061273 U CN200720061273 U CN 200720061273U CN 201138751 Y CN201138751 Y CN 201138751Y
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- controlled reactor
- grounding
- small resistor
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Abstract
The utility model relates to a grounding packaged system of composite controlled reactor and low resistance in power network, which is characterized in that the grounding packaged system comprises a grounding transformer (1), a controlled reactor (2), a small resistance (3) and a controller (4); the secondary coil of the grounding transformer (1) is connected with the neutral point PT of the power network and connected with an earthing point CT via the controlled reactor (2), and the small resistance (3) is serially connected with a high-voltage switch (5) and subsequently connected with the controlled reactor (2) in parallel connection; two signal input terminals of the controller (4) are respectively connected with the input terminal, the neutral point PT and the earthing point CT, and the control signal output terminal of the controller (4) is connected with the control input terminal of the high-voltage switch (5). The utility model overcomes the defects of the difficult isolation and very difficult finding of the grounding line which exists in the existing various protection devices for the grounding fault of the power network, rapidly eliminates the faults, causes not to trip, and is an ideal protection packaged system of the distribution network grounding fault.
Description
Technical field
The utility model relates to a kind of single phase ground fault protection the complete sets of equipment that are applied to realize in the system for distribution network of power, particularly is involved in a kind of controllable type reactance and the compound ground protection the complete sets of equipment of small resistor in the electric equipment technical field.
Background technology
At present, the power network neutral point earth point mode of electric power system 35kV and following electric pressure mainly contains following several: one, isolated neutral; Two, neutral point resistance grounded is in the low resistance grounding mode; Three, resonance grounding mode, neutral by arc extinction coil grounding.
In isolated neutral system, when a phase fault takes place when, the power supply that is connected on the current collector on the voltage between phases does not meet with destruction, they can continue operation, but at this moment non-fault phase voltage raises, the insulation weak spot is breakdown probably, thereby causes the phase ground short circuit, badly damaged electric equipment.And in isolated neutral system, when the capacitance current of ground connection was big, the electric arc that causes at the ground connection place was difficult to gap electric arc (electric arc that promptly periodically extinguishes Yu restrike) also may occur from horizontal blanking.Because electrical network is an oscillation circuit with inductance and electric capacity, indirect arc can cause overvoltage relatively, this overvoltage can be transferred to earth point to be had on the whole electrical network that directly is electrically connected, and causes that another relatively punctures easilier, and forms the two phase ground short circuit.
In the prior art, in order to solve the problem that isolated neutral brings, two kinds of general employing grounding through arc mode or low resistance grounding modes, wherein: the grounding through arc mode can realize extinguish arcs, but existence is isolated the ground path difficulty, searched the bigger shortcoming of ground path difficulty.Though the low resistance grounding mode is the tripping earth fault line accurately, existing does not have differentiation to instantaneity ground connection and permanent earth fault, the trip-out rate height, and earth fault current is big, to shortcomings such as system shock are big.Therefore, existing neutral ground protective device can not effectively be got rid of electrical network earth fault, can not ensure that the safety of electric power system is normally used.
The utility model content
The purpose of this utility model; be for overcome isolation ground path difficulty that the grounding through arc mode exists, to search the ground path difficulty bigger; and the low resistance grounding mode exist instantaneity ground connection and permanent earth fault are not had differentiation, trip-out rate height, the defective big to system shock, a kind of power network controllable type single-phase earthing earth-fault protection is provided.
The purpose of this utility model can reach by taking following measure:
The compound ground connection the complete sets of equipment of power network controllable reactance and small resistor, its design feature is: comprise grounding transformer, controlled reactor, small resistor and controller; The neutral point PT that the secondary winding of grounding transformer connects power network with is connected earth point CT by controlled reactor, small resistor is connected in parallel with controlled reactor behind the high-voltage switch gear; Two signal input parts of controller connect input respectively and connect neutral point PT, earth point CT, and the control signal output ends of controller connects the control input end of high-voltage switch gear.
The purpose of this utility model can also reach by taking following measure:
A kind of implementation of the present utility model is: controlled reactor is made of miniature transformer, one group of inverse parallel controllable silicon and filter circuit; Miniature transformer comprises two secondary winding, and wherein, one in inferior winding connection inverse parallel controllable silicon, another secondary winding connection filter circuit.Controlled reactor output offset current, the capacitance current of bucking-out system.
A kind of implementation of the present utility model is: small resistor and controlled reactor are short-term operation, and its thermal capacity time is less than or equal to 10s.
A kind of implementation of the present utility model is: controller comprises computer chip and current detecting unit, and the I/O mouth of computer chip connects neutral point PT, earth point CT by current detecting unit.
Beneficial effect of the present utility model is:
The capacitance current of system when 1, controlled reactor of the present utility model compensates the instantaneity single phase ground fault is fast eliminated fault rapidly, need not trip; Deal with permanent single phase ground fault by the small resistor in the complete sets of equipment; the closed high switch produces than the large-signal electric current after dropping into small resistor; ground protection function by line protective devices is easy to realize optionally tripping operation, isolated fault circuit rapidly and accurately.
2, adopt the utility model integrated treatment to solve electric network single-phase earth fault; both developed the advantage of resonance grounding and low resistance grounding; avoided again simultaneously all kinds protective device of existing electrical network earth fault isolation ground path difficulty, to search the ground path difficulty bigger; instantaneity ground connection and permanent earth fault there are not differentiation, trip-out rate height, the defective shortcoming that earth fault current is big, system shock is big.
3, the utility model is the function that realizes the bucking-out system capacitance current by controlled reactor.Small resistor is in parallel with controlled reactor by high-voltage switch gear.For the transient fault that takes place in the power distribution network,, reduce the earth point residual flow and make arc extinction by controlled reactor output offset current; For permanent earth fault, insert small resistor by the closed high switch, can realize the tripping operation quick and precisely of faulty line, be desirable distribution net work earthing fault protection the complete sets of equipment.
Description of drawings
Fig. 1 is the circuit theory diagrams of a specific embodiment of the utility model.
Fig. 2 is the structural representation schematic diagram of the controlled reactor among Fig. 1.
Fig. 3 is the circuit theory diagrams of a specific embodiment of the utility model.
Embodiment
With reference to Fig. 1, present embodiment comprises grounding transformer 1, controlled reactor 2, small resistor 3 and controller 4; The neutral point PT that the secondary winding of grounding transformer 1 connects power network with is connected earth point CT by controlled reactor 2, small resistor 3 high-voltage switch gears 5 of connecting are afterwards in parallel with controlled reactor 2; Two signal input parts of controller 4 connect input respectively and connect neutral point PT, earth point CT, and the control signal output ends of controller 4 connects the control input end of high-voltage switch gear 5.
Referring to Fig. 2, controlled reactor 2 is made of miniature transformer T, one group of inverse parallel controllable silicon SC and filter circuit; Filter circuit is the LC filter circuit, is formed by connecting by inductance L and capacitor C; Miniature transformer comprises two secondary winding, and wherein, a secondary winding A connects the inverse parallel controllable silicon, and another secondary winding B connects filter circuit.Controlled reactor 2 output offset currents, the capacitance current of bucking-out system.
In the present embodiment: small resistor 3 and controlled reactor 2 are short-term operation, and its thermal capacity time is less than or equal to 10s.Controller 4 comprises computer chip and current detecting unit, and the I/O mouth of computer chip connects neutral point PT, earth point CT by current detecting unit.Computer chip is by the magnitude of current of monitoring grounding point CT, and the control controlled reactor carries out suitable current compensation to neutral point of electric network, and judges whether to be the permanent earth short circuit according to the time that the earth current amount is kept, thus the closed and disconnected of control high-voltage switch gear.
With reference to Fig. 3, the course of work and the principle of present embodiment are as follows:
High-voltage switch gear 5 was in off-state when electrical network normally moved, when power distribution network generation transient earthing fault, at first the certain perceptual offset current of controlled reactor 2 outputs compensates electrical network, the capacitance current of system when compensating the instantaneity single phase ground fault fast, eliminate fault rapidly, need not trip, can not exert an influence power receiving equipment.Controller time of 4 general settings judges that electrical network is a transient fault; promptly after surpassing this setting-up time; controller 4 has also detected the earth point capacity current; then be judged to be permanent earth fault; controller 4 drives high-voltage switch gears 5 closures, drops into small resistor 3 back generations than the large-signal electric current at this moment; people and realize tripping operation, isolated fault circuit rapidly and accurately by route protection.
To instantaneity earth fault takes place in the power distribution network, input controlled reactor 2 compensates to earth fault dies away, and failure protecting device is out of service automatically;
To permanent earth fault takes place in the power distribution network, early investment controlled reactor 2 compensates, and ground connection continuing dropped into small resistor 3 after surpassing setting time automatically.By switch protection tripping operation excision faulty line, after the faulty line excision, fault disappears, and controlled reactor 2 withdraws from compensation automatically, and small resistor 3 is withdrawed from small resistor 3 by 5 automatic disconnections of switching high-voltage switch gear.
Because in the distribution network systems that has the overhead wire outlet, most of single phase ground fault is an instantaneity earth fault, these faults can be died away after compensating through controllable type grounding through resistance protection the complete sets of equipment, need not tripping operation.And permanent single phase ground fault fast separate row remove, prevent that fault from expanding as phase fault.
The startup of failure protecting device determines that by the operating characteristic of mixing earthing mode this mode start-up criterion is a neutral point voltage.Usually the starting resistor of controlled reactor is 25% of the specified phase voltage of system in the controlled reactor grounding system, or is accustomed to setting starting resistor by the user.
Defining of instantaneity ground connection and permanent earth fault, promptly drop into the time set of small resistor, the instantaneity ground connection duration common in the system is generally in 1 second, also there is the partial earthing fault after through the controlled reactor compensation, can in the several seconds, recover voluntarily, should adopt the controlled reactor compensation for this class earth fault, begin to be advisable in back 5～10 seconds so the time of input small resistor should be set in ground connection.
Failure protecting device cooperates with protective relaying device, and in the low resistance grounding system, generally be set at 1 second the operate time of feeder line zero-sequenceprotection, and generally be set at 1.5 seconds the operate time that ground connection becomes zero-sequenceprotection.So throwing small resistor surpasses after 1 second, if feeder line zero-sequenceprotection tripping.Can excise ground connection change according to the protection philosophy of low resistance grounding system and protect, this moment, system became isolated neutral system.The operating time of setting small resistor in the controllable type grounding through resistance the complete sets of equipment is 1.2 seconds, cuts away small resistor automatically before ground connection becomes the zero-sequenceprotection action, and controlled reactor also withdraws from compensation.This moment, system also became isolated neutral system, had also protected the safety of controllable type grounding through resistance the complete sets of equipment simultaneously.
Claims (4)
1, the compound ground connection the complete sets of equipment of power network controllable reactance and small resistor is characterized in that: comprise grounding transformer (1), controlled reactor (2), small resistor (3) and controller (4); The neutral point PT that the secondary winding of grounding transformer (1) connects power network with is connected earth point CT by controlled reactor (2), small resistor (3) high-voltage switch gear (5) of connecting is afterwards in parallel with controlled reactor (2); Two signal input parts of controller (4) connect input respectively and connect neutral point PT, earth point CT, and the control signal output ends of controller (4) connects the control input end of high-voltage switch gear (5).
2, the compound ground connection the complete sets of equipment of power network controllable reactance according to claim 1 and small resistor is characterized in that: controlled reactor (2) is made of miniature transformer, one group of inverse parallel controllable silicon and filter circuit; Miniature transformer comprises two secondary winding, and wherein, one another secondary winding connects filter circuit in inferior winding connection inverse parallel controllable silicon, and controlled reactor is exported offset current, the capacitance current of bucking-out system.
3, the compound ground connection the complete sets of equipment of power network controllable reactance according to claim 1 and small resistor is characterized in that: small resistor (3) and controlled reactor (2) are short-term operation, and its thermal capacity time is less than or equal to 10s.
4, the compound ground connection the complete sets of equipment of power network controllable reactance according to claim 1 and small resistor, it is characterized in that: controller (4) comprises computer chip and current detecting unit, and the I/O mouth of computer chip connects neutral point PT, earth point CT by current detecting unit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2007200612732U CN201138751Y (en) | 2007-12-11 | 2007-12-11 | Earthing set equipment combining power grid controllable reaction with small resistance |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2007200612732U CN201138751Y (en) | 2007-12-11 | 2007-12-11 | Earthing set equipment combining power grid controllable reaction with small resistance |
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| Publication Number | Publication Date |
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| CN201138751Y true CN201138751Y (en) | 2008-10-22 |
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| Application Number | Title | Priority Date | Filing Date |
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| CNU2007200612732U Expired - Fee Related CN201138751Y (en) | 2007-12-11 | 2007-12-11 | Earthing set equipment combining power grid controllable reaction with small resistance |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101499655B (en) * | 2008-11-06 | 2011-02-09 | 江苏省电力公司 | Neutral point grounding resistor plant for electrical power system |
| CN102361321A (en) * | 2011-09-05 | 2012-02-22 | 四川省电力公司资阳公司 | 110/220 kV transformers' neutral point grounding via small reactance |
| CN101710697B (en) * | 2009-11-17 | 2012-05-16 | 江苏省电力试验研究院有限公司 | Device and method for inhibiting direct current of neutral point of transformer |
| CN102623976A (en) * | 2012-03-23 | 2012-08-01 | 上海市电力公司 | Combined type grounding system of reactor and resistor in power distribution network |
| CN103219721A (en) * | 2013-04-19 | 2013-07-24 | 国家电网公司 | Automatic integrated processing method for single-phase earth fault |
| CN103236687A (en) * | 2013-04-19 | 2013-08-07 | 国家电网公司 | Short-time controllable reactor compensation method |
| CN104810818A (en) * | 2015-01-26 | 2015-07-29 | 合肥康德电气有限公司 | Dynamic compensation grounded arc-extinguishing and resonance-eliminating protection device for power supply and distribution system |
| CN110048392A (en) * | 2019-03-13 | 2019-07-23 | 国网浙江省电力有限公司电力科学研究院 | A kind of simulation system and method for configuration type power distribution network dynamic model mixing earthing mode |
-
2007
- 2007-12-11 CN CNU2007200612732U patent/CN201138751Y/en not_active Expired - Fee Related
Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101499655B (en) * | 2008-11-06 | 2011-02-09 | 江苏省电力公司 | Neutral point grounding resistor plant for electrical power system |
| CN101710697B (en) * | 2009-11-17 | 2012-05-16 | 江苏省电力试验研究院有限公司 | Device and method for inhibiting direct current of neutral point of transformer |
| CN102361321A (en) * | 2011-09-05 | 2012-02-22 | 四川省电力公司资阳公司 | 110/220 kV transformers' neutral point grounding via small reactance |
| CN102623976A (en) * | 2012-03-23 | 2012-08-01 | 上海市电力公司 | Combined type grounding system of reactor and resistor in power distribution network |
| CN103219721A (en) * | 2013-04-19 | 2013-07-24 | 国家电网公司 | Automatic integrated processing method for single-phase earth fault |
| CN103236687A (en) * | 2013-04-19 | 2013-08-07 | 国家电网公司 | Short-time controllable reactor compensation method |
| CN103236687B (en) * | 2013-04-19 | 2015-07-01 | 国家电网公司 | Short-time controllable reactor compensation method |
| CN104810818A (en) * | 2015-01-26 | 2015-07-29 | 合肥康德电气有限公司 | Dynamic compensation grounded arc-extinguishing and resonance-eliminating protection device for power supply and distribution system |
| CN110048392A (en) * | 2019-03-13 | 2019-07-23 | 国网浙江省电力有限公司电力科学研究院 | A kind of simulation system and method for configuration type power distribution network dynamic model mixing earthing mode |
| CN110048392B (en) * | 2019-03-13 | 2023-12-26 | 国网浙江省电力有限公司电力科学研究院 | Simulation system and method for movable mould mixed grounding mode of configuration type power distribution network |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20081022 Termination date: 20101211 |