CN101795003B - Solid combination switch device - Google Patents
Solid combination switch device Download PDFInfo
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- CN101795003B CN101795003B CN200910250652XA CN200910250652A CN101795003B CN 101795003 B CN101795003 B CN 101795003B CN 200910250652X A CN200910250652X A CN 200910250652XA CN 200910250652 A CN200910250652 A CN 200910250652A CN 101795003 B CN101795003 B CN 101795003B
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- 239000007787 solid Substances 0.000 title claims abstract description 32
- 239000013307 optical fiber Substances 0.000 claims description 10
- 239000012212 insulator Substances 0.000 claims description 7
- 230000007935 neutral effect Effects 0.000 claims description 7
- 239000004973 liquid crystal related substance Substances 0.000 claims description 4
- 239000003990 capacitor Substances 0.000 abstract description 24
- 238000000034 method Methods 0.000 description 5
- 238000012544 monitoring process Methods 0.000 description 4
- 230000000694 effects Effects 0.000 description 3
- 230000001960 triggered effect Effects 0.000 description 3
- 238000006243 chemical reaction Methods 0.000 description 2
- 238000010276 construction Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000001105 regulatory effect Effects 0.000 description 2
- 230000001360 synchronised effect Effects 0.000 description 2
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000015556 catabolic process Effects 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 239000010949 copper Substances 0.000 description 1
- 230000002950 deficient Effects 0.000 description 1
- 230000001934 delay Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 230000005693 optoelectronics Effects 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
- Y02E40/30—Reactive power compensation
Abstract
The invention provides a solid combination switch device which can switch a parallel capacitor to a system automatically; the device is mainly used for reactive compensation of a high-voltage electric power system, zero passage (arcless) conduction and cut-off of a high-voltage electric power capacitor set is carried out automatically by calculating the reactive power value of the system; the solid combination switch device mainly comprises that: a thyristor, a contactor, a thyristor energy delivery system and a control system are integrated into a combined mechanism in an equipment cabinet, and an external connecting wire only needs three-phase voltage, electric current signals and direct-current 220V control power supply to realize the combination switch which can automatically switch the parallel capacitor set.
Description
Technical field
The invention belongs to the electric power system devices field; Be specifically related to a kind of through calculating the idle instantaneous value of electric power system automatically; Control device phase-splitting under the situation that guarantees no arc triggers thyristor and automatic switching contactor, thus the access of control capacitance device group and the solid combination switch device of excision.
Background technology
Solid combination switch device is a kind of being installed in the power distribution cabinet, thereby through constantly calculating the intelligent switching device of the idle automatic switching power capacitor group of electric power system.Combination switch adopts the mode of thyristor and contactor parallel running.When dropping into, at first trigger thyristor, drop into contactor again through the short time time-delay, be implemented in system voltage zero crossing input; When excision, at first trigger thyristor, break off contactor through the short time time-delay, and then cutoff thyristor, contactor is when breaking off, and electric current flows through thyristor, realizes that contactor turn-offs at current zero-crossing point.It is fashionable to divide at contactor, and not arcing has prolonged the contactor life-span greatly, but and frequent switching.
At present, the switching mode of the fixed capacitor group that electric power system is commonly used is the mode that adopts switching circuit breaker or contactor, through the access and the excision system of manual deciliter circuit breaker control capacitance device group.There are two problems in this mode: the one, and manual deciliter Shunt Capacitor Unit; Need the operator on duty of the transformer station idle situation of attention system constantly; Control the input of Shunt Capacitor Unit and excise the idle of bucking-out system in case need compensating reactive power to carry out manual deciliter circuit breaker again, real-time is relatively poor; The 2nd since idle moment of system change; Need frequent switching circuit breaker; And circuit breaker exists the situation of arcing when the input of the non-zero crossing of the excision of the non-zero crossing of electric current and voltage, like this to existing very big influence in useful life of circuit breaker.
At the existing a kind of intelligent combination switch of low-voltage distribution system, of one Chinese patent application 200720178283, adopt thyristor parallelly connected, and adopt analog circuit to control with relay.The problem that it exists has:
1. the idle situation of computing system voluntarily, and carry out the switching of power capacitor group automatically, bring the reactive power compensation real-time poor thus;
2. relay breaking current ability has limited this intelligent combination switch and can only be used in low-voltage distribution system;
3. triggering thyristor before not to the monitoring of thuristor working state, if damage has appearred in thyristor, then combination switch is in short-circuit condition always, and fault-free is reported to the police, and can't combination switch is out of service.
4. when the system voltage height needed many thyristor series connection, the control loop in the patent can't guarantee to trigger thyristor simultaneously, was prone to thyristor and triggered the asynchronous phenomenon that is broken down by high-voltage and burns.
Therefore, to many incomplete problem of present manual switching power capacitor group and existing combination switch, the present invention provides a kind of solid combination switch device, addresses the above problem.
Summary of the invention
In order to reduce the service wear of circuit breaker; Increase its useful life; The objective of the invention is the idle instantaneous value through automatic calculating electric power system, the conducting through the control thyristor when needing compensating reactive power realizes that with turn-offing contactor and capacitor group in the zero crossing input of voltage and the zero crossing excision of branch current, had both guaranteed the real-time of system's reactive power compensation; Made things convenient for the operator on duty, also overcome the defective that considerable influence arranged of frequent deciliter circuit breaker simultaneously its useful life.
The technical scheme that technical solution problem of the present invention is adopted is:
A kind of solid combination switch device comprises a rack and three wall bushings, three wall bushing one termination three-phase bus; The head end of the thyristor valve string that two groups of another terminations of two wall bushings that wherein are positioned at both sides are made up of a plurality of just antiparallel thyristors series connection, vacuum contactor of every group of thyristor valve string two ends parallel connection, thyristor valve string tail end and vacuum contactor tail end and middle that wall bushing short circuit; The all external trigger board of the gate pole of the just antiparallel thyristor valve of every group of thyristor valve string and negative electrode, trigger board link to each other with control system through optical fiber, it is characterized in that: said rack is rack independently; Thyristor and control system are in same said rack; Wall bushing is adopted in the external voltage wiring, per two the positive inverse parallels of inner thyristor, and adopt many forms to connect to series connection; Thyristor valve string and the parallel connection of three-phase vacuum contactor; Thyristor valve string is perpendicular to the ground, adopts vertical compact structure, and the tail end of said three-phase vacuum contactor links to each other and constitutes neutral point; Said neutral point links to each other with cabinet through insulator, and thyristor topmost links to each other with cabinet with insulator respectively both sides.
Wherein, control system comprises regulon and valve base electronic unit (VBE), and wherein: regulon comprises power panel and dsp board (digital signal panel) and input/output board, liquid crystal board and human-machine operation button; The valve base electronic unit comprises power panel, triggers logic card, repays plate, triggering signal output board, thuristor working state LED display floater, operating state spanner and deciliter spanner; Control system produces control wave at the system voltage zero crossing and passes to the vacuum contactor that trigger board triggers thyristor and control deciliter and thyristor valve connection in series-parallel through optical fiber.
Wherein, This device is applied to 10kV and above high-voltage electric power system, and establishing this high-voltage electric power system is A, B, C three-phase, and solid combination switch device is serially connected with A, C two phases by two groups of thyristor valves; The energy of every phase trigger board becomes direct current into high-frequency alternating current by an inverter; Export to a high-frequency impulse current transformer, the output of high-frequency impulse current transformer is connected on high-tension cable two ends, high-tension cable series connection high-frequency step-up transformer; Said high-frequency step-up transformer secondary output is through over commutation, and becoming direct current provides energy to trigger board.
The invention has the beneficial effects as follows: from integrally-built angle, solid combination switch device of the present invention is a compact device, and floor space is little, and external cabling is few; And this device is an automatic control equipment, need not the operator on duty of transformer station manual operation, made things convenient for the operator on duty; Only insert thyristor mutually, when contactor breaks off,, can not produce the three-phase imbalance operation owing to B phase no current loop at A, the C two of system, the use of both having saved thyristor, and also cost is cheap relatively, and overall structure is simple.This device can be used in the high-low pressure electric power system; Adopt many thyristor series connection; Still solved the problem of synchronous triggering thyristor; When moving at ordinary times, increased the monitoring to thyristor, prevented that thyristor from punch through damage occurring contactor is in by short-circuit condition, the capacitor group can't be out of service.Owing to deciliter contactor, reduced deciliter number of times of capacitor group branch breaker, increased the useful life of circuit breaker.
Description of drawings
Fig. 1 is a solid combination switch device front view of the present invention;
Fig. 2 is the vertical section structural map of solid combination switch device of the present invention, and wherein Fig. 2-1 removes the Qianmen front view for solid combination switch device, and Fig. 2-2 removes the Qianmen end view for solid combination switch device;
Fig. 3 is solid combination switch device control principle figure of the present invention;
Fig. 4 is the system construction drawing of solid combination switch device of the present invention;
Fig. 5 is a solid combination switch device system voltage polar plot of the present invention;
Wherein, 1-front cabinet door, 2-valve base electronic control unit, 3-regulon, 4-deciliter spanner; 5-operating state spanner, 6-contactor deciliter indicator light, 7-air switch, 8-wall bushing; The 9-thyristor trigger board is sent ability power supply, 10-high-frequency current transformer, 11-insulator, 12-high-tension cable; The 13-high-frequency step-up transformer, 14-thyristor trigger board, 15-thyristor, 16-vacuum contactor.
Embodiment
Below, in conjunction with accompanying drawing solid combination switch device of the present invention is further specified.
Solid combination switch device integral installation of the present invention is in a power distribution cabinet; Comprise two phase thyristor valve strings; Three-phase contactor, thyristor trigger board, thyristor trigger board send ability inverter, high-frequency current transformer, step-up transformer, regulon, valve base electronic unit, triggering and repayment optical fiber, operating state spanner, contactor deciliter spanner, alternating current-direct current air switch, contactor deciliter indicator light.
According to the difference of electric pressure, this solid combination switch device is divided into high pressure primary system part and low pressure electrical secondary system part.Primary system scheme: in the power distribution cabinet of a cuboid; Three-phase voltage is connect the bus copper bar through wall bushing; Connect three-phase contactor with wye connection then, promptly the head end of three-phase contactor connects the three-phase voltage source inlet wire respectively, and tail end links to each other and constitutes neutral point; Neutral point is through insulator ground connection, and the A at three-phase voltage source distinguishes parallelly connected a string thyristor with C contactor mutually mutually from beginning to end simultaneously.Because when not conducting of thyristor, even contactor is closed, B is conducted,,, B do not have in the connecting system so still being equivalent to electric capacity mutually because electric current does not have the loop.
The electrical secondary system scheme is: electrical secondary system mainly is made up of control system and thyristor triggering system.Control system comprises regulon and valve base electronics (VBE) unit, and wherein: regulon comprises power panel and dsp board (digital signal panel) and input/output board, liquid crystal board and human-machine operation button; The valve base electronic unit comprises power panel, triggers logic card, repays plate, triggering signal output board, thuristor working state LED display floater operating state spanner and deciliter spanner.The thyristor triggering system comprises thyristor trigger board, inverter, high-frequency impulse current transformer, high-tension cable, high-frequency step-up transformer composition.
Operation principle of the present invention: the input/output board and the valve base electronic unit that threephase potential transformer secondary singal summation current transformer secondary singal are attempted by regulon trigger logic card;, be again that the valve base electronic unit is as the synchronizing voltage that triggers thyristor both as the idle foundation of the calculating of regulon.The triggering logic card of valve base electronic unit can be on thuristor working state LED display floater the present operating state of display working condition spanner; Trigger corresponding relays node closure on the logic card; Can give node signal in the transformer station, make the operator on duty in the station, just can monitor the operating state of solid combination switch device.Spanner is when automatic working method in working order; Regulon is through calculate the idle instantaneous value of system automatically; The reactive limit value of setting in advance with the human-machine operation button on the liquid crystal board compares; Be idle dead band between the bound of set point, system is idle in idle dead zone range then the capacitor branch road do not carry out a deciliter handover operation.The upper limit will drop into the capacitor group if the idle definite value of system surpasses the setting definite value; Idle definite value is lower than setting definite value lower limit will excise the capacitor group.When the needs input was perhaps excised the capacitor group, regulon was given a relay node of valve base electronic unit closure signal through input/output board.The triggering logic card of valve base electronic unit sends a monitoring pulse at each cycle of system at ordinary times; Send to each thyristor trigger board through the triggering signal output board by the optical fiber unification, after thyristor trigger board receives the monitoring pulse signal, if contactor is in off-state; Then repay thuristor working state; If contactor is in closure state, then repaying sending of thyristor trigger board can state, repays to the repayment plate through optical fiber; Repay to triggering logic card by the repayment plate, trigger logic card and show at thuristor working state LED display floater.After receiving the regulon signal; If all repayment signals all are normal; The valve base electronic unit triggers logic card and can send trigger command for the triggering signal output board at the system voltage zero crossing; The triggering signal output board obtains issuing thyristor trigger board triggering thyristor, deciliter contactor then simultaneously by optical fiber after the order.If certain transistors breakdown or thyristor trigger board fault appear in the repayment signal; Then can not trigger thyristor, and report fault at thuristor working state LED display floater, trouble light is bright; And the corresponding relay closes on the triggering logic card is given node signal of output in the station.
If the operating state spanner is when the manual work mode; Then this moment, the valve base electronic unit did not receive the instruction of regulon; Directly outside rack, manually turn the node signal instruction that complex automatic control system is sent deciliter contactor in deciliter handle switch or the transformer station, after the valve base electronic unit obtains deciliter signal instruction, if the signal of thyristor trigger board repayment is normal by manual work; Then send out trigger command at the system voltage zero crossing; Send to each thyristor trigger board by the triggering signal output board through optical fiber, thyristor trigger board triggers thyristor, deciliter contactor after the thyristor conducting.Because contactor is parallelly connected with thyristor, by the thyristor short circuit, so contactor does not bear voltage in deciliter process, the while is no current also in deciliter process.If fault has appearred in thyristor or thyristor trigger board; The triggering logic card of valve base electronic unit is repaid the control room to transformer station with the mode that has no chance node; Notify the operator on duty to need repairing; The operator on duty can withdraw from the operation of combination switch through the conversion of operating state spanner, by the operator on duty on cabinet, turn deciliter direct control contactor of spanner deciliter.
Fig. 1 is the solid combination switch device front view.According to indicating among the figure: 1. front cabinet door; 2. valve base electronic control unit; If the valve that the VBE case front panel shows or the operating state of thyristor trigger board are all normal: when the operating state spanner was positioned at automated manner, the instruction that receives regulon triggered thyristor and deciliter contactor at the system voltage zero crossing; When the operating state spanner was positioned at manual mode, deciliter order that receives complex automatic control system in deciliter spanner or the station triggered thyristor and deciliter contactor at the system voltage zero crossing; When the operating state spanner is positioned at withdrawing mode, by the personnel of transformer station through turn deciliter direct control contactor of spanner on the cabinet deciliter; 3. regulon, the idle instantaneous value of computing system, and send the switching instruction in the needs opening-closing capacitor bank, for the valve base electronic unit; 4. deciliter spanner when the operating state spanner is positioned at the manual work mode, can turns deciliter spanner and send deciliter instruction for the valve base electronic unit; 5. the operating state spanner is divided into three kinds of working methods, manual mode, automated manner and withdraw from control mode; 6. contactor deciliter indicator light, the disconnection of detector bar and closure; 7. air switch is power supply or the voltage signal access solid combination switch device with the outside.Order from left to right is: adjusting cabinet DC power supply air switch, VBE cabinet DC power supply air switch, A phase thyristor trigger board are sent ability power supply, C phase thyristor trigger board to send ability power supply, blower fan and mains lighting supply (blower fan is for equipment in the rack is played certain cooling effect), are regulated cabinet ac voltage power supply (connecting system voltage transformer secondary voltage; As idle calculated data), VBE cabinet ac voltage power supply (connecting system voltage transformer secondary voltage is as triggering the thyristor synchronizing voltage);
Fig. 2 is the vertical section structural map of first embodiment of solid combination switch device.According to indicating among the figure: 8. wall bushing, direct welding system high voltage bus, and play the effect with the cabinet insulation; 9. thyristor trigger board is sent the ability power supply, becomes high-frequency alternating current to direct current; 10. high-frequency current transformer, send can power supply high-frequency alternating current step-down up-flow; 11. insulator plays the cross-brace effect of vertical thyristor valve string, and insulate with solid combination switch device cabinet door; 12. high-tension cable is connected on the high-frequency current transformer low-pressure side, for the high-frequency step-up transformer of thyristor trigger board provides energy.13. high-frequency step-up transformer is as the thyristor trigger board power supply.14. thyristor trigger board links to each other with the repayment plate with the triggering signal output board of VBE cabinet through optical fiber, receives the trigger command of VBE cabinet, and can state feedback give the valve base electronic unit with valve with getting; 15. thyristor; 16 vacuum contactors;
Fig. 3 is the overall control principle figure of solid combination switch device.The secondary voltage of the voltage transformer summation current transformer of system is connected on as synchronizing signal reconciles the unit as calculating idle foundation, the secondary voltage with voltage transformer inserts the valve base electronic unit as synchronizing voltage simultaneously.Regulon is through the idle instantaneous value of the system of calculating, and compares with the idle control dead area of regulon, if the idle definite value of system surpasses and sets the definite value upper limit and will drop into the capacitor group; Idle definite value is lower than setting definite value lower limit will excise the capacitor group.When the needs opening-closing capacitor bank, reconciling the unit sends the relay node signal for the valve base electronic unit; The valve base electronic unit sends triggering signal at the synchronizing voltage zero crossing after receiving signal; Triggering signal is given the TE plate through opto-electronic conversion; The TE plate triggers thyristor, through after the certain time-delay, and valve base electronic unit opening-closing capacitor bank.
Fig. 4 is the system construction drawing of solid combination switch device.Among the figure, A, B, C are system's three-phase bus, and N is a capacitor group filter branch neutral point.This kind connects method and is primarily aimed in the switching mode of Synchronous Switching three-phase condenser bank, and under the situation that contactor breaks off and thyristor does not trigger, B can't constitute current circuit with other mutually mutually, so B phase capacitor is equivalent to there is not input coefficient.At first trigger thyristor by regulating the solid combination switch device control system that power supply and valve base electronic unit form, deciliter contactor again, there is current circuit mutually in other after B and the conducting two at this moment, and three-phase filter branch capacitor group has inserted system.The switching that so neither delays three-phase condenser bank has been saved one group of thyristor valve string again, has saved investment.
Fig. 5 is the system voltage polar plot.Fig. 5-the 1st wherein, the vector correlation of line voltage and phase voltage.Fig. 5-2 is the vector correlation of C phase voltage and AB line voltage.When contactor was in the separating brake position, to bear voltage be AB line voltage to A phase thyristor when not triggering, and the zero crossing that at first is chosen in UAB triggers A phase thyristor; AB two is conducted, and then this moment, C phase thyristor bore the C phase voltage, according to Fig. 5-1 and Fig. 5-2; Because the system voltage vector is an equilateral triangle, so the C phase voltage is vertical with AB line voltage, the UAB zero passage just in time is a C phase voltage zero crossing through 90 degree; Trigger C phase thyristor this moment, for zero crossing triggers.
Above through special embodiment content description the present invention, but those skilled in the art also can recognize the multiple possibility of modification and optional embodiment, for example, through combination and/or change the characteristic of single embodiment.Therefore, it is understandable that these modification and optional embodiment will be considered as included among the present invention, only enclosed Patent right requirement book of scope of the present invention and coordinate restriction thereof.
Claims (3)
1. a solid combination switch device comprises a rack and three wall bushings, three wall bushing one termination three-phase bus; The head end of the thyristor valve string that two groups of another terminations of two wall bushings that wherein are positioned at both sides are made up of a plurality of just antiparallel thyristors series connection, vacuum contactor of every group of thyristor valve string two ends parallel connection, thyristor valve string tail end and vacuum contactor tail end and middle that wall bushing short circuit; The all external trigger board of the gate pole of the just antiparallel thyristor of every group of thyristor valve string and negative electrode, trigger board link to each other with control system through optical fiber, it is characterized in that: said rack is rack independently; Thyristor and control system are in same said rack; Wall bushing is adopted in the external voltage wiring, per two the positive inverse parallels of inner thyristor, and adopt many forms to connect to series connection; Thyristor valve string and the parallel connection of three-phase vacuum contactor; Thyristor valve string is perpendicular to the ground, adopts vertical compact structure, and the tail end of said three-phase vacuum contactor links to each other and constitutes neutral point; Said neutral point links to each other with cabinet through insulator, and thyristor topmost links to each other with cabinet with insulator respectively both sides.
2. solid combination switch device as claimed in claim 1 is characterized in that: control system comprises regulon and valve base electronic unit (VBE), and wherein: regulon comprises power panel and dsp board and input/output board, liquid crystal board and human-machine operation button; The valve base electronic unit comprises power panel, triggers logic card, repayment plate, triggering signal output board, thuristor working state LED display floater, operating state spanner and deciliter spanner: control system produces control wave at the system voltage zero crossing and passes to the vacuum contactor that trigger board triggers thyristor and control deciliter and thyristor valve connection in series-parallel through optical fiber.
3. solid combination switch device as claimed in claim 2; It is characterized in that: this device is applied to 10KV and above high-voltage electric power system, and establishing this high-voltage electric power system is A, B, C three-phase, and solid combination switch device is serially connected with A, C two phases by two groups of thyristor valves; The energy of every phase trigger board becomes direct current into high-frequency alternating current by an inverter; Export to a high-frequency impulse current transformer, the output of high-frequency impulse current transformer is connected on high-tension cable two ends, high-tension cable series connection high-frequency step-up transformer; Said high-frequency step-up transformer secondary output is through over commutation, and becoming direct current provides energy to trigger board.
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| Application Number | Priority Date | Filing Date | Title |
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| CN200910250652XA CN101795003B (en) | 2009-12-11 | 2009-12-11 | Solid combination switch device |
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| CN200910250652XA CN101795003B (en) | 2009-12-11 | 2009-12-11 | Solid combination switch device |
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| CN101795003A CN101795003A (en) | 2010-08-04 |
| CN101795003B true CN101795003B (en) | 2012-07-18 |
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| CN200910250652XA Expired - Fee Related CN101795003B (en) | 2009-12-11 | 2009-12-11 | Solid combination switch device |
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Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102013793B (en) * | 2010-10-12 | 2014-02-12 | 中国电力科学研究院 | Method for triggering thyristor for converter valve module test |
| CN102545242A (en) * | 2012-02-14 | 2012-07-04 | 丽水电业局 | Intelligent switching device for 10kV reactive power compensation equipment |
| CN110091758B (en) * | 2018-01-31 | 2022-02-08 | 株洲中车时代电气股份有限公司 | Oil tank type ground passing neutral section device |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2914310Y (en) * | 2005-12-08 | 2007-06-20 | 武汉江北开关有限责任公司 | Intelligent combination switch |
| CN201061152Y (en) * | 2007-06-28 | 2008-05-14 | 北京时代新纪元技术有限公司 | Power condenser on/off switch |
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2009
- 2009-12-11 CN CN200910250652XA patent/CN101795003B/en not_active Expired - Fee Related
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2914310Y (en) * | 2005-12-08 | 2007-06-20 | 武汉江北开关有限责任公司 | Intelligent combination switch |
| CN201061152Y (en) * | 2007-06-28 | 2008-05-14 | 北京时代新纪元技术有限公司 | Power condenser on/off switch |
Non-Patent Citations (1)
| Title |
|---|
| 周静等.电子复合开关在电力高压配电网中的应用.《电子与封装》.2009,第9卷(第11期), * |
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Owner name: CHINA ELECTRIC POWER RESEARCH INSTITUTE STATE ELEC Free format text: FORMER OWNER: CHINA ELECTRIC POWER RESEARCH INSTITUTE Effective date: 20130129 |
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