CN201004553Y - Arc over voltage limit for power transmission and distribution system and integrated device for small current grounding and line selection - Google Patents
Arc over voltage limit for power transmission and distribution system and integrated device for small current grounding and line selection Download PDFInfo
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- CN201004553Y CN201004553Y CNU2007200017309U CN200720001730U CN201004553Y CN 201004553 Y CN201004553 Y CN 201004553Y CN U2007200017309 U CNU2007200017309 U CN U2007200017309U CN 200720001730 U CN200720001730 U CN 200720001730U CN 201004553 Y CN201004553 Y CN 201004553Y
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Abstract
The utility model discloses a compound route selection device for the arc overvoltage limitation as well as the low current grounding of an electric power transmission and distribution system and belongs to electric power transmission and distribution system overvoltage protection field. The utility model comprises a multifunctional micro computer controller, three single-phase high tension vacuum switches as well as a high energy pressure restrict arc extinguishing device. The normally open contacts of three single-phase high tension vacuum switches connect in a star shape, wherein the three tips are connected on a system three phase buss respectively and the other end is connected on the high energy pressure limited arc extinguishing device; and the high energy pressure limited arc extinguishing device mainly consists of linear and non-linear resistance as well as high speed regulator tap. The utility model can effectively restrain 3 to 35kv overvoltage that caused by neutral point indirect grounding electric fence single phase intermittent arc grounding and resonance, and can ensure the branch circuit select route exactly when single phase grounding, and also can be widely used in the high voltage station-service of the 3 to 35kv substation and power plant and the prior system provided with arc extinguishing loops can still be available.
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 arc grounding overvoltage Limiting and earthing wire-selecting is specially arc overvoltage restriction of power transmission and distribution system and small current earthing wire-selecting integration unit.
Background technology
Power transmission and distribution system, especially mesohigh power transmission and distribution electric power system (3-35KV) mostly adopt system with non effectively earth ed neutral.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 power transmission and distribution system's arc grounding overvoltage Limiting and small current earthing wire-selecting integration unit at defective and problem that prior art exists.The purpose of this utility model; be to develop a cover novel protector; 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: power transmission and distribution system arc grounding overvoltage Limiting and small current earthing wire-selecting integration unit, single-phase high voltage vacuum switch and a high energy pressure limiting arc-control device of comprising multifunctional controller control by microcomputerized controller control, the single-phase high voltage vacuum switch is three, the normally opened contact of three single-phase high voltage vacuum switches is star-like connection, wherein three terminations are connected to respectively on system's three-phase bus, and other one terminates at high energy pressure limiting arc-control device upper end; High energy pressure limiting arc-control device is made up of high energy ZnO linear resistance and high energy ZnO nonlinear resistance and the controlled high-speed switch of high pressure, the controlled high-speed switch of its mesohigh high energy ZnO nonlinear resistance in parallel two ends, the high-power resistance that described high-energy non-linear resistance is formed 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 immediately and is gone up mutually, utilize the common pressure limiting arc-suppression circuit of forming of high energy ZnO linear resistance and high energy ZnO nonlinear resistance, overvoltage to the fault phase limits, and eliminates system's arc grounding overvoltage; When stable arcing ground is taken place, microcomputerized controller sends the high-pressure vacuum switch of instruction quick-make fault phase and the controlled high-speed switch of high pressure in the high energy pressure limiting arc-control device, high energy ZnO nonlinear resistance in the high energy pressure limiting arc-control device is by the controlled high-speed switch short circuit of high pressure, 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, the multifunctional microcomputer controller 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 that is connected between three-phase bus and the controller input, be used for the input signal of the voltage signal of acquisition system, and realize real-time monitoring system as controller.The secondary sideband of voltage transformer has auxiliary winding, and will assist winding to connect into the open delta winding, and the open delta winding is connected to the signal input part of controller, is mainly used to finish the monitoring to system voltage; When system's generation resonance fault, by the controller output node, moment the short circuit voltage transformer the open delta winding, destroy the resonant parameter of system, eliminate resonance.
The effect of described multifunctional controller, be the system voltage gathered with voltage transformer as input signal, correspondingly control each high-pressure vacuum switch action, reach the purpose of overvoltage Limiting and earthing wire-selecting.The structure that realizes the controller 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.
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 equally.
Description of drawings
Fig. 1 is the circuit theory diagrams of integration unit described in the utility model;
Embodiment
Arc overvoltage restriction of power transmission and distribution system and small current earthing wire-selecting integration unit, comprise multifunctional microcomputer controller 1, single-phase controllable high-voltage vacuum switch 4 and high energy pressure limiting arc-control device 5, the single-phase high voltage vacuum switch is three, the normally opened contact ZKa of three single-phase high voltage vacuum switches, ZKb, ZKc is star-like connection, wherein three terminations are connected to respectively on system's three-phase bus, other one terminates on the high energy pressure limiting arc-control device 5, high energy pressure limiting arc-control device 5 is made up of high energy ZnO linear resistance RV1 and high energy ZnO nonlinear resistance RV2 and the controlled high-speed switch CK of high pressure, and the controlled high-speed switch CK of its mesohigh is connected in parallel on high energy ZnO nonlinear resistance RV2 two ends and exists.Also comprise the voltage transformer TV that is connected between three-phase bus and the controller input, the secondary sideband of voltage transformer has auxiliary winding, and will assist winding to connect into the open delta winding, the open delta winding is connected to the signal input part of multifunctional microcomputer 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.It is the hardware configuration (being aided with well-designed software) of core that multifunctional microcomputer controller 1 adopts with the single-chip microcomputer; Device 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 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.Multifunctional microcomputer controller 1 is under corresponding software is supported, the three-phase voltage that provides according to voltage transformer 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 high energy ZnO nonlinear resistance RV2 two ends.If because the switching overvoltage that the vacuum switch operation causes, singlechip controller 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 high energy ZnO nonlinear resistance two ends and get the controlled high-speed switch CK of high pressure, 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, multifunctional controller 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.
Claims (3)
1, a kind of power transmission and distribution system's arc overvoltage restriction and small current earthing wire-selecting integration unit, comprise controller, single-phase high voltage vacuum switch and high energy pressure limiting arc-control device, it is characterized by: the single-phase high voltage vacuum switch is three, the normally opened contact of three single-phase high voltage vacuum switches (ZKa, ZKb, ZKc) is star-like connection, wherein three terminations are connected to respectively on system's three-phase bus, and other one terminates at high energy pressure limiting arc-control device; Described high energy pressure limiting arc-control device is made up of high energy oxidizability linear resistance RV1 and high energy oxidizability nonlinear resistance RV2 and high speed gate-controlled switch CK, and high speed gate-controlled switch CK is controlled by microcomputerized controller.
2, power transmission and distribution system's overvoltage Limiting as claimed in claim 1 and small current earthing wire-selecting integration unit, it is characterized by: also comprise the voltage transformer (TV) that is connected between three-phase bus and the multifunctional microcomputer controller input, the secondary sideband of voltage transformer has auxiliary winding, and will assist winding to connect into the open delta winding, the open delta winding is connected to the signal input part of multifunctional microcomputer controller.
3, power transmission and distribution system's overvoltage Limiting as claimed in claim 1 or 2 and small current earthing wire-selecting integration unit, it is characterized by: it is the hardware configuration of core that the multifunctional microcomputer controller adopts with the single-chip microcomputer, can finish Comprehensive Control simultaneously to extinguishing arc and route selection, can accurately judge ground path according to circuit zero sequence current variation before and after the arc-extinction device action.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2007200017309U CN201004553Y (en) | 2007-01-08 | 2007-01-08 | Arc over voltage limit for power transmission and distribution system and integrated device for small current grounding and line selection |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2007200017309U CN201004553Y (en) | 2007-01-08 | 2007-01-08 | Arc over voltage limit for power transmission and distribution system and integrated device for small current grounding and line selection |
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| CN201004553Y true CN201004553Y (en) | 2008-01-09 |
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| CNU2007200017309U Expired - Fee Related CN201004553Y (en) | 2007-01-08 | 2007-01-08 | Arc over voltage limit for power transmission and distribution system and integrated device for small current grounding and line selection |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102472118A (en) * | 2009-08-12 | 2012-05-23 | 西门子公司 | Power plant and method for operating a power plant |
| CN102623985A (en) * | 2012-01-17 | 2012-08-01 | 合肥凯高电气设备有限公司 | Novel comprehensive grounding protection and route selection device for medium-voltage power distribution system |
| CN103837798A (en) * | 2014-03-15 | 2014-06-04 | 李景禄 | Quick diagnostic method and processing device of power distribution network single-phase earth fault characters |
| CN105141207A (en) * | 2015-10-19 | 2015-12-09 | 白山发电厂 | High-energy zinc oxide linear resistor and high-energy zinc oxide nonlinear resistor combined protection device for full voltage de-excitation |
| CN107884683A (en) * | 2017-12-28 | 2018-04-06 | 国网山东省电力公司高密市供电公司 | Current initial traveling wave detection device and substation outgoing cable fault monitoring method |
-
2007
- 2007-01-08 CN CNU2007200017309U patent/CN201004553Y/en not_active Expired - Fee Related
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102472118A (en) * | 2009-08-12 | 2012-05-23 | 西门子公司 | Power plant and method for operating a power plant |
| CN102472118B (en) * | 2009-08-12 | 2016-03-02 | 西门子公司 | Power plant equipment and the method for running power plant equipment |
| CN102623985A (en) * | 2012-01-17 | 2012-08-01 | 合肥凯高电气设备有限公司 | Novel comprehensive grounding protection and route selection device for medium-voltage power distribution system |
| CN103837798A (en) * | 2014-03-15 | 2014-06-04 | 李景禄 | Quick diagnostic method and processing device of power distribution network single-phase earth fault characters |
| CN105141207A (en) * | 2015-10-19 | 2015-12-09 | 白山发电厂 | High-energy zinc oxide linear resistor and high-energy zinc oxide nonlinear resistor combined protection device for full voltage de-excitation |
| CN107884683A (en) * | 2017-12-28 | 2018-04-06 | 国网山东省电力公司高密市供电公司 | Current initial traveling wave detection device and substation outgoing cable fault monitoring method |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| ASS | Succession or assignment of patent right |
Owner name: CITY HENGTONG HIGH-VOLTAGE ELECTRIC CO. Free format text: FORMER OWNER: LI YONGJI Effective date: 20080801 |
|
| C41 | Transfer of patent application or patent right or utility model | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20080801 Address after: No. 1199 Yingbin Road, Jilin, Jilin, China: 132011 Patentee after: Jilin Hengtong High Voltage Electric Co., Ltd. Address before: Jilin city in Jilin Province Economic Development Zone No. 99 Chuanying, zip code: 132002 Patentee before: Li Yongji |
|
| C56 | Change in the name or address of the patentee |
Owner name: RIXIN HENGTONG ELECTRIC CO., LTD. Free format text: FORMER NAME: JILIN HENGTONG HIGH VOLTAGE ELECTRIC CO., LTD. |
|
| CP01 | Change in the name or title of a patent holder |
Address after: 132011, Yingbin Road, Jilin, Jilin, 1199 Patentee after: Nissin Hengtong Electric Co., Ltd. Address before: 132011, Yingbin Road, Jilin, Jilin, 1199 Patentee before: Jilin Hengtong High Voltage Electric Co., Ltd. |
|
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20080109 Termination date: 20150108 |
|
| EXPY | Termination of patent right or utility model |