CN201323449Y - Integrated device for over-voltage limit in electric power transmission and distribution system - Google Patents
Integrated device for over-voltage limit in electric power transmission and distribution system Download PDFInfo
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- CN201323449Y CN201323449Y CNU2008201577162U CN200820157716U CN201323449Y CN 201323449 Y CN201323449 Y CN 201323449Y CN U2008201577162 U CNU2008201577162 U CN U2008201577162U CN 200820157716 U CN200820157716 U CN 200820157716U CN 201323449 Y CN201323449 Y CN 201323449Y
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Abstract
The utility model relates to an integrated device for over-voltage limit in an electric power transmission and distribution system. The device comprises a microcomputer controller, a single-phase high-voltage vacuum switch and a high-energy voltage-limit arc extinguishing device, wherein normally open contacts of the three single-phase high-voltage vacuum switches are connected in the shape of a star and are respectively connected with a three-phase bus of the system, and the other ends are connected with the high-energy voltage-limit arc extinguishing device; the high-energy voltage-limit arc extinguishing device comprises a first high-energy oxidizability line-shape resistor and a second high-energy oxidizability line-shape resistor connected in series, as well as a high-speed controllable switch in parallel connection with the second high-energy oxidizability line-shape resistor; the high-speed controllable switch is connected to and controlled by the microcomputer controller; and the other end of the second high-energy oxidizability line-shape resistor is grounded. The device of the utility model can efficiently inhibit over-voltage due to indirectly grounding of 3-35kv neutral point and grounding of power network single-phase intermittent electric arc, can ensure accurate single-phase grounding wire selection of branch circuit, and is not influenced by the changing of a power network operation mode and the expansion of power network, so that both big and small networks can be used.
Description
Technical field
The utility model relates to power transmission and distribution system overvoltage Limiting, and particularly the field of power transmission and distribution system overvoltage Limiting and earthing wire-selecting is specially restriction of system with non effectively earth ed neutral arc overvoltage and small current earthing wire-selecting integration unit.
Background technology
(3～35KV) mostly adopt system with non effectively earth ed neutral for power transmission and distribution system, especially mesohigh power transmission and distribution electric power system.In system with non effectively earth ed neutral, except that lightning overvoltage, the most frequent by the overvoltage that single-phase earthing electric arc causes, and this class overvoltage has higher amplitude and long duration, if such overvoltage can not effectively limit, will produce the damage of accumulation property to the electricity supply and use equipment in this class electrical network, and may cause generation puncture or alternate flashover over the ground, thereby cause short circuit accident etc. in the external insulation weak spot.
At present, the major measure of restriction arc light grounding surge is still neutral point of electric network through grounding through arc.But arc suppression coil can not be eliminated intermittent arcing ground over-voltage, amplitude that can not over-voltage, even in some cases, because of the existence of arc suppression coil, arc reignition may just take place constantly at maximum this least favorable of recovery voltage, and the arc grounding overvoltage is raise.High fdrequency component and the real component of arc suppression coil in can not the compensation of ground electric current, the indirect arc ground connection of high frequency still exists; During greater than certain value, the fault point ground arc can not put out equally certainly in real component.Arc suppression coil cuts little ice to the overvoltage that causes of restriction resonance, and very likely causes ferro resonance when residual voltage and zero-sequence current appear in broken string or high-pressure side.Practical operating experiences proves that also in 3～35kv of neutral by arc extinction coil grounding power distribution network, the accident that causes because of the electric arc overvoltage happens occasionally.
The patent No. is that the Chinese patent of 99229228.x discloses a kind of " Triphase Power Networks And Indirect Earthing System Overvoltage Debooster ".It has taked to change intermittent arcing ground the directly grounded extinguishing arc measure of into bus metallicity, but this overvoltage limiter causes impact to system in the moment of busbar grounding and disconnection, particularly disconnect the transient overvoltage of earth bus moment generation, make in insulation level decline and still may take place once more by the single-phase indirect arc ground connection that the overvoltage impact causes, and after ground connection disconnects, stored charge unnecessary on the sound electric capacity relatively will be by the winding discharge of instrument transformer, cause the moment magnetic saturation of winding, still can excite ferro resonance.
At present external (domestic also have the minority area to begin to adopt) takes neutral point to suppress this overvoltage through low resistance grounding to this type of electrical network, but single-phase earthing when taking place in this system, no matter single phase ground fault is moment, or nonvolatil, all directly the fault earthing circuit is excised, and the operating experience of electric power system shows, the single phase ground fault overwhelming majority is moment, the electrical network that constitutes of overhead transmission line particularly, must cause sharply increasing of power outage like this, obviously reduce power supply reliability.
Another problem that neutral point non-direct grounding system exists is exactly the ground protection poor selectivity.Existing little electric current line selection apparatus all is that the amplitude of zero-sequence current is compared in employing and the method for phase place is carried out route selection, but adopt these two kinds of methods to carry out the device of earthing wire-selecting, at zero-sequence current hour and during system's generation arc grounding, can accurately not select faulty line, be a large amount of uses of a kind of arc-extinction device of 99229228.x in addition along with the patent No., the earth fault of previous system can be transferred on the bus of system in the extinguishing arc process of this device, so in having installed the electric power system of arc-extinction device that the patent No. is 99229228.x, all now Small Electric Current Earthing And Routing Devices are all accurately route selection.
Summary of the invention
The utility model provides a kind of integration unit that is used for power transmission and distribution system overvoltage Limiting at defective and problem that prior art exists.Integration unit of the present utility model is to make 3～35KV neutral nondirect earthing network, under various operational modes, all can effectively limit the single phase intermittent arcing ground over-voltage, to phylogenetic any ground connection earth fault, the no matter size of system capacitive current, all route selection that can be correct.
The utility model is to adopt following technical scheme to realize the foregoing invention target
A kind of integration unit that is used for power transmission and distribution system overvoltage Limiting, it is characterized in that, this device comprises microcomputerized controller, single-phase high voltage vacuum switch and high energy pressure limiting arc-control device, described single-phase high voltage vacuum switch has three, the normally opened contact ZKa of three single-phase high voltage vacuum switches, ZKb, ZKc is star-like connection, its three terminations are connected to respectively on the three-phase bus of system, the other end is connected to high energy pressure limiting arc-control device, described high energy pressure limiting arc-control device comprises the linear resistance R V1 of the first high energy oxidizability and the linear resistance R V2 of the second high energy oxidizability of series connection, also comprise one with the linear resistance R V2 of described second high energy oxidizability high speed gate-controlled switch CK in parallel, this high speed gate-controlled switch CK is connected to microcomputerized controller and controls folding, the other end ground connection of the linear resistance R V2 of the described second high energy oxidizability by it.
Be connected to voltage transformer TV between described three-phase bus and the microcomputerized controller input, the secondary sideband of this voltage transformer TV has auxiliary winding, should connect into the open delta winding by auxiliary winding, this open delta winding is connected to the signal input part of microcomputerized controller.
Described microcomputerized controller is that single-chip microcomputer is the hardware configuration of core, can finish the Comprehensive Control to extinguishing arc and route selection simultaneously, can accurately judge ground path according to circuit zero sequence current variation before and after the arc-extinction device action.
An optimization as such scheme; in order to protect switching overvoltage and lightning overvoltage; described system three-phase bus is connected on the composite type overvoltage protector, and three ports of this composite type overvoltage protector connect three buses respectively, another port ground connection.
Technique scheme has been brought following technological merit than prior art:
Integration unit described in the utility model can effectively suppress the overvoltage that the single-phase indirect arc ground connection of 3～35kv neutral nondirect earthing network causes, accurate route selection in the time of can guaranteeing the branched line single-phase earthing, the mechanism of its extinguishing arc and route selection and the size of electric network capacitance and current are irrelevant, thereby the influence that not enlarged by the change of power system operating mode and electrical network, big and small networks all can use, whole device can be formed a high-voltage board, simple in structure, volume is little, install, debugging is convenient, and is cheap, safe in utilization, can be widely used in the high pressure station-service system in 3～35kv transformer station and power plant, the former system that arc suppression coil is housed is available too.
Description of drawings
Fig. 1 is the circuit theory diagrams that are used for the integration unit of power transmission and distribution system overvoltage Limiting of the present utility model.
Embodiment
Come the integration unit that is used for power transmission and distribution system overvoltage Limiting of the present utility model is described in further detail below in conjunction with accompanying drawing and specific embodiment, but can not limit protection range of the present utility model with this.
Please see Figure 1 earlier, Fig. 1 is the circuit theory diagrams that are used for the integration unit of power transmission and distribution system overvoltage Limiting of the present utility model.As seen from the figure, the utility model is a kind of system with non effectively earth ed neutral arc overvoltage restriction and small current earthing wire-selecting integration unit, this device comprises microcomputerized controller 1, single-phase high voltage vacuum switch 4 and high energy pressure limiting arc-control device 5, described single-phase high voltage vacuum switch 4 has three, the normally opened contact of three single-phase high voltage vacuum switches 4 (i.e. ZKa among the figure, ZKb, ZKc) be star-like connection, its three terminations are connected to respectively on the three-phase bus of system, the other end is connected to high energy pressure limiting arc-control device 5, described high energy pressure limiting arc-control device 5 comprises the linear resistance R V1 of the first high energy oxidizability and the linear resistance R V2 of the second high energy oxidizability of series connection, also comprise one with the linear resistance R V2 of described second high energy oxidizability high speed gate-controlled switch CK in parallel, this high speed gate-controlled switch CK is connected to microcomputerized controller 1 and controls folding, the other end ground connection of the linear resistance R V2 of the described second high energy oxidizability by it.
The high-power resistance that above-mentioned linear resistance R V1 of the first high energy oxidizability and the linear resistance R V2 of the second high energy oxidizability form for the high energy ZnO material.When the gap arcing ground over-voltage takes place in electrical network, fault phase vacuum contactor is put into fault with high energy pressure limiting arc-control device 5 immediately and is gone up mutually, utilize the common pressure limiting arc-suppression circuit of forming of two high energy ZnO nonlinear resistances, overvoltage to the fault phase limits, and eliminates system's arc grounding overvoltage; When stable arcing ground is taken place, microcomputerized controller 1 sends the high-pressure vacuum switch of instruction quick-make fault phase and the controlled high-speed switch CK of high pressure in the high energy pressure limiting arc-control device 5, the linear resistance R V1 of the first high energy oxidizability in the high energy pressure limiting arc-control device 5 is by the controlled high-speed switch CK of high pressure short circuit, made fault directly insert the high energy ZnO linear resistance mutually, fault is phase-changed into stable resistive ground connection, utilize good temperature characterisitic of high energy ZnO linear resistance and energy absorption characteristics, the voltage of fault restriction phase, the overvoltage of elimination system.When system's generation single phase ground fault, microcomputerized controller 1 is by before and after relatively arc-extinction device moves, the zero-sequence current size of all circuits, accurately judge the place, fault point of system, solve the technical barrier that the little electric current line selection apparatus of present tradition can't cooperate with arc-extinction device, can accurately select the faulty line of system.
As existing arc overvoltage limiter, integration unit described in the utility model also comprises the voltage transformer TV that is connected between three-phase bus and microcomputerized controller 1 input, be used for the input signal of the voltage signal of acquisition system, and realize real-time monitoring system as microcomputerized controller 1.Described voltage transformer TV is made of three single-phase potential transformers, three single-phase potential transformers once all adopt star-like the connection with the secondary limit, the auxiliary winding triangle of the three-phase on secondary limit is not connected but closed and form the open delta winding; The characteristics of this voltage transformer are that the range of linearity is wide, phase shift is little, even when in system the most serious arc grounding overvoltage taking place, also can guarantee the amplitude of its output signal and the accuracy of phase place.
The effect of above-mentioned microcomputerized controller 1 is: the system voltage of being gathered with voltage transformer TV is correspondingly controlled each high-pressure vacuum switch action as input signal, reaches the purpose of overvoltage Limiting and earthing wire-selecting.The structure that realizes the microcomputerized controller 1 of this function is as well known to those skilled in the art and easy realization.As adopting single-chip microcomputer to constitute, also can use various logic circuitry to realize.
Above-mentioned integration unit also comprises high voltage isolator QS, as the critical piece that this device is connected with electric power system, can realize the break-make of this device and system by this element; Also comprise high-tension fuse 2,, be mainly used to protect the safe operation of voltage transformer TV as the backup protection unit of this device; Also comprise fast acting fuse 3, as the main backup protection unit of this device, characteristics be switch off time short (＜2ms), cut-off capacity big (＞63kA), be mainly used to the internal short circuit fault of anti-locking apparatus; Also comprise combination overvoltage protector 6, be mainly used to protect switching overvoltage and lightning overvoltage.
During work, TV provides actuating signal by voltage transformer, finishes the real-time monitoring to system.The three-phase voltage that microcomputerized controller 1 provides according to voltage transformer TV and the variation of residual voltage instantaneous value are judged, and according to the result who judges, send corresponding instruction, make three high-pressure vacuum switchs and be connected in parallel on the controlled high-speed switch CK action of the high pressure at the second high energy ZnO nonlinear resistance RV2 two ends.If because the switching overvoltage that the vacuum switch operation causes, microcomputerized controller 1 can not send any instruction; When the indirect arc grounding surge takes place, normally opened contact ZKa or the ZKb or the ZKc of the high-pressure vacuum switch by closed fault phase, make fault insert high energy pressure limiting arc-control device mutually, the electromagnetic energy that the ground connection of releasing causes, the recovery voltage of restriction ground connection phase, the fault point is limited lowlyer because of recovery voltage, and electric arc can not be restriked and extinguishing arc.
When stable arcing ground over-voltage takes place, normally opened contact ZKa or the ZKb or the ZKc of the high-pressure vacuum switch by closed fault phase and be connected in parallel on the controlled high-speed switch CK of high pressure at high energy ZnO nonlinear resistance two ends, the resistive ground connection that fault is transformed into mutually, thereby the voltage of restriction ground connection phase is eliminated the arc grounding fault.
When system's generation single phase ground fault, microcomputerized controller 1 is by before and after relatively arc-extinction device moves, the zero-sequence current size of all circuits, accurately judge the place, fault point of system, solve the technical barrier that the little electric current line selection apparatus of present tradition can't cooperate with arc-extinction device, can accurately select the faulty line of system.
Undoubtedly, the integration unit that is used for power transmission and distribution system overvoltage Limiting of the present utility model comprises that also other reconfigurations and device substitute, and are not limited to structure cited in the foregoing description and device.Generally speaking, protection range of the present utility model also comprises the variation that other it will be apparent to those skilled in the art that and substitutes.
Claims (6)
1. integration unit that is used for power transmission and distribution system overvoltage Limiting, it is characterized in that, this device comprises microcomputerized controller (1), single-phase high voltage vacuum switch (4) and high energy pressure limiting arc-control device (5), described single-phase high voltage vacuum switch (4) has three, normally opened contact (the ZKa of three single-phase high voltage vacuum switches (4), ZKb, ZKc) be star-like connection, its three terminations are connected to respectively on the three-phase bus of system, the other end is connected to high energy pressure limiting arc-control device (5), described high energy pressure limiting arc-control device (5) comprises the linear resistance R V1 of the first high energy oxidizability and the linear resistance R V2 of the second high energy oxidizability of series connection, also comprise one with the linear resistance R V2 of described second high energy oxidizability high speed gate-controlled switch CK in parallel, this high speed gate-controlled switch CK is connected to microcomputerized controller (1) and controls folding, the other end ground connection of the linear resistance R V2 of the described second high energy oxidizability by it.
2. the integration unit that is used for power transmission and distribution system overvoltage Limiting according to claim 1, it is characterized in that, be connected to voltage transformer TV between described three-phase bus and microcomputerized controller (1) input, the secondary sideband of this voltage transformer TV has auxiliary winding, should connect into the open delta winding by auxiliary winding, this open delta winding is connected to the signal input part of microcomputerized controller (1).
3. the integration unit that is used for power transmission and distribution system overvoltage Limiting according to claim 2 is characterized in that, is connected with high-tension fuse (2) between the input of described microcomputerized controller (1) and the three-phase bus.
4. according to claim 1 or the 2 or 3 described integration units that are used for power transmission and distribution system overvoltage Limiting, it is characterized in that, described microcomputerized controller (1) is the hardware configuration of core for single-chip microcomputer, finish Comprehensive Control to extinguishing arc and route selection, and, judge ground path according to circuit zero sequence current variation before and after the arc-extinction device action.
5. according to claim 1 or the 2 or 3 described integration units that are used for power transmission and distribution system overvoltage Limiting; it is characterized in that; described system three-phase bus is connected on the composite type overvoltage protector (6); three ports of this composite type overvoltage protector (6) connect three buses respectively, another port ground connection.
6. the integration unit that is used for power transmission and distribution system overvoltage Limiting according to claim 4; it is characterized in that; described system three-phase bus is connected on the composite type overvoltage protector (6); three ports of this composite type overvoltage protector (6) connect three buses respectively, another port ground connection.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2008201577162U CN201323449Y (en) | 2008-12-24 | 2008-12-24 | Integrated device for over-voltage limit in electric power transmission and distribution system |
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| Application Number | Priority Date | Filing Date | Title |
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| CNU2008201577162U CN201323449Y (en) | 2008-12-24 | 2008-12-24 | Integrated device for over-voltage limit in electric power transmission and distribution system |
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| CN201323449Y true CN201323449Y (en) | 2009-10-07 |
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| CNU2008201577162U Expired - Fee Related CN201323449Y (en) | 2008-12-24 | 2008-12-24 | Integrated device for over-voltage limit in electric power transmission and distribution system |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102931650A (en) * | 2012-11-15 | 2013-02-13 | 陈文根 | Over-voltage protection monitor |
| CN102946094A (en) * | 2012-10-10 | 2013-02-27 | 中国电力科学研究院 | Suppressing measure selecting method for very fast transient overvoltage of transformer substation |
| CN103368165A (en) * | 2012-03-05 | 2013-10-23 | 顾敏珠 | Arc elimination and harmonic elimination and overvoltage protector |
| CN104348149A (en) * | 2014-11-06 | 2015-02-11 | 国家电网公司 | Primary side neutral point ground control system for 10kV potential transformer (PT) |
| CN106208017A (en) * | 2016-07-22 | 2016-12-07 | 安徽亚辉电气自动化有限公司 | A kind of for arc-extinguishing harmonic-eliminating and the integration unit of overvoltage protection |
| US20200274361A1 (en) * | 2017-08-30 | 2020-08-27 | Siemens Aktiengesellschaft | Frequency stabilization arrangement |
-
2008
- 2008-12-24 CN CNU2008201577162U patent/CN201323449Y/en not_active Expired - Fee Related
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103368165A (en) * | 2012-03-05 | 2013-10-23 | 顾敏珠 | Arc elimination and harmonic elimination and overvoltage protector |
| CN102946094A (en) * | 2012-10-10 | 2013-02-27 | 中国电力科学研究院 | Suppressing measure selecting method for very fast transient overvoltage of transformer substation |
| CN102931650A (en) * | 2012-11-15 | 2013-02-13 | 陈文根 | Over-voltage protection monitor |
| CN104348149A (en) * | 2014-11-06 | 2015-02-11 | 国家电网公司 | Primary side neutral point ground control system for 10kV potential transformer (PT) |
| CN104348149B (en) * | 2014-11-06 | 2017-10-24 | 国家电网公司 | A kind of 10kV voltage transformers primary side neutral ground control system |
| CN106208017A (en) * | 2016-07-22 | 2016-12-07 | 安徽亚辉电气自动化有限公司 | A kind of for arc-extinguishing harmonic-eliminating and the integration unit of overvoltage protection |
| US20200274361A1 (en) * | 2017-08-30 | 2020-08-27 | Siemens Aktiengesellschaft | Frequency stabilization arrangement |
| US11581737B2 (en) * | 2017-08-30 | 2023-02-14 | Siemens Energy Global GmbH & Co. KG | Frequency stabilization arrangement |
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Legal Events
| Date | Code | Title | Description |
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| 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: 20091007 Termination date: 20121224 |