CN101546670B - Zero current disjunction AC vacuum contactor - Google Patents
Zero current disjunction AC vacuum contactor Download PDFInfo
- Publication number
- CN101546670B CN101546670B CN200910116686XA CN200910116686A CN101546670B CN 101546670 B CN101546670 B CN 101546670B CN 200910116686X A CN200910116686X A CN 200910116686XA CN 200910116686 A CN200910116686 A CN 200910116686A CN 101546670 B CN101546670 B CN 101546670B
- Authority
- CN
- China
- Prior art keywords
- lead
- draw
- pin
- resistance
- operational amplifier
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
Images
Landscapes
- Emergency Protection Circuit Devices (AREA)
Abstract
The present invention relates to a zero current disjunction AC vacuum contactor, composed of three single-phase contactors separately. When using the contactor, a singlechip samples, compares, records power supply voltage and phase, and awaits a stop signal. When the singlechip receives a disjunction instruction, it is capable of controlling three controlled silicon in turn based on an optimum disjunction phase angle, three attracting coils control the disjunction of three-phase contacts when the electric potential passes through zero separately, here the current is zero without sparkle, thus it is capable of implementing non arc disjunction and non breakage to the contactor.
Description
Technical field
The present invention relates to person in electronics, especially a kind of AC vacuum contactor of Zero current disjunction.
Background technology
The vacuum technique of vacuum contactor uses advanced; Have that breaking capacity is strong, breaking capacity is big, contact is difficult for oxidation, electric arc does not expose, suitable frequent operation, safe and reliable, outstanding advantage such as maintenance workload is little; In electric power system, replaced other type of switch gradually, obtained using widely.When the vacuum contactor breaks off the inductive load electric current, the appearance of negative charged current phenomenon of before not reaching zero point, being cut-off by force often, remaining electromagnetic energy can produce overvoltage on the inductive load, and you are cut-off overvoltage this overvoltage that is produced by the phenomenon of damming.The size of cut-off overvoltage is directly proportional with the inductance of shut off value and load.
Vacuum tube produce the reason dam mainly be since arc current hour, the metallic vapour that the electrode spot provides is fully stable inadequately to be caused.This just why when the vacuum contactor cut-offs big inductive current, can not produce the reason of cut-off overvoltage on the contrary.Because along with the increase of electric current, metallic vapour fully evaporates, arc stability many.Experiment showed, when drop-out current reaches hundreds of to a few kilo-ampere the general phenomenon of just not damming.
When the vacuum contactor breaks off capacity current or big inductive current, restrike or thump and pass the main aspect that voltage is problem.After the overvoltage of restriking generally refers to arc extinction, electric arc resume combustion in the power-frequency voltage phase angle is 0～90 degree scope; Bang wears to be meant to be electric arc resume combustion in 90～180 degree scopes.
Vacuum contactor causes little electric current cut-off overvoltage, large-current electric arc to restrike and the existence of the problems such as wearing of thumping badly influences the safe in utilization and life-span of vacuum contactor in disjunction; Though the safeguard measure to vacuum contactor is constantly perfect; But all be to adopt passive modes such as increasing RC absorption circuit, crosstalk sense and electric capacity, Zinc-oxide piezoresistor to advance protection, can't fundamentally eliminate the potential safety hazard of vacuum contactor.
Summary of the invention
The AC vacuum contactor that the purpose of this invention is to provide a kind of Zero current disjunction can't thoroughly be eliminated the problem of the potential safety hazard of vacuum contactor to solve traditional passive type resist technology.
In order to achieve the above object, the technical scheme that the present invention adopted is:
The AC vacuum contactor of Zero current disjunction includes base, and said base is provided with three vacuum switch tubes; And respectively with three pull-in windings of three vacuum tube corresponding matching, said each vacuum switch tube one end be provided with the high-tension electricity triple line in the terminals that phase line is connected, it is characterized in that: also be provided with on the said base and three vacuum switch tubes, three intelligence controlling devices of corresponding matching respectively; Said intelligence controlling device comprises that model is the PIC single-chip microcomputer of 16F628A and with the voltage transformer that power supply links to each other, be connected with pull-up resistor on the pin 1 of said PIC single-chip microcomputer after, be connected to power supply through lead again; The pin 2 of said PIC single-chip microcomputer is connected with identical series arm through lead respectively with pin 3, and said series arm comprises that model is the two-way operational amplifier of LM2902, after the output of said two two-way operational amplifiers is connected with resistance; Being connected to corresponding model through resistance respectively again is six inverter triggers of 74LS14, and the output of two six inverter triggers is connected to the pin 2 and pin 3 of said PIC single-chip microcomputer respectively through lead, also have lead to draw between said resistance and six inverter triggers; Said drawing is connected with ground connection behind the electric capacity on the lead, the in-phase input end ground connection of the said two-way operational amplifier that connects with pin 3, the reverse inter-input-ing ending grounding of the said two-way operational amplifier that connects with pin 2; Said two another in-phase input ends of two-way operational amplifier and inverting input also are connected on the terminals of same electric capacity through lead respectively, also have lead to draw between the two-way operational amplifier in said electric capacity and the said series arm, and said drawing is connected with ground connection behind the resistance on the lead; After another terminals of said electric capacity were connected with resistance through lead, the output that to be connected to the 3rd model again be the two-way operational amplifier of LM2902 also had lead to draw between said electric capacity and the said resistance; The said lead of drawing is connected with ground connection behind the electric capacity, and the in-phase input end of said the 3rd two-way operational amplifier has two leads to draw, and draws for one and is connected with ground connection behind the electric capacity on the lead; After another root is drawn and is connected with two resistance of connecting each other on the lead; The output that to be connected to the 4th model again be the two-way operational amplifier of LM2902 has two leads to draw on the inverting input of said the 3rd two-way operational amplifier, be connected with ground connection behind the resistance on the lead; Another root lead is connected with the output that is connected to the 3rd two-way operational amplifier behind the resistance again; The output of said the 3rd two-way operational amplifier also has two leads to draw, and draws after lead is connected with two resistance, is connected on the pin 1 of said PIC single-chip microcomputer again for one; There is lead to draw between said two resistance; Said drawing is connected with ground connection behind mutual series connection two diodes in the opposite direction on the lead, another root on the output of said the 3rd two-way operational amplifier is drawn after lead is connected with electric capacity, is connected on the in-phase input end of the 3rd two-way operational amplifier two more each other between the resistance of series connection; The in-phase input end of said the 4th two-way operational amplifier is connected with ground connection behind the pull-up resistor; There are two leads to draw on the inverting input, draw after lead is connected with resistance, be connected to said voltage transformer again for one; Another root is drawn lead and is connected with the output that is connected to said the 4th two-way operational amplifier behind the resistance again, and two power ends of said the 4th two-way operational amplifier connect positive-negative power respectively;
Also include two and isolate optocoupler; The pin 11 of said PIC single-chip microcomputer is connected with said two collector electrodes of isolating triode in the optocoupler through lead respectively with pin 13; Said two emitters of isolating triode in the optocoupler are respectively through lead ground connection; Also have lead to draw respectively on said two collector electrodes of isolating the triode in the optocouplers, said drawing after lead is connected to pull-up resistor is connected to power supply again; Said two anodes of isolating the light-emitting diode in the optocoupler have lead to draw respectively; Draw for two and be connected to power supply again after lead is connected to pull-up resistor respectively, said two negative electrodes of isolating light-emitting diode in the optocouplers are connected on two pins of plug connector of one four pin through lead respectively, and two other pin of the plug connector of said four pin is respectively through lead ground connection.
When the inner PIC single-chip microcomputer of intelligence controlling device receives switching signal, electromagnet sends the adhesive instruction in pull-in winding, two triodes that connect through PIC single-chip microcomputer pin 9 and photoelectrical coupler; The conducting of control bidirectional triode thyristor; Realization is to the control of vacuum tube attracting state, electromagnetic actuation, and vacuum tube is closed; Zero current disjunction vacuum contactor three tunnel all closes a floodgate, and equipment gets.When the inner PIC single-chip microcomputer of intelligence controlling device receives breaking signal; Two triodes through 9 connections of PIC single-chip microcomputer pin; Control the ending of bidirectional triode thyristor, realize control to vacuum tube disjunction state, three road intelligence controlling devices will be according to detecting this road voltage zero-cross moment, voltage-phase, best disjunction phase angle and in the best time; Send the disjunction instruction; Let electromagnet dead electricity in the corresponding pull-in winding, and be implemented in this road vacuum tube and break off, thereby realize the Zero current disjunction purpose in the moment of voltage over zero.
The present invention propose a kind of have an intelligent functions let all AC vacuum contactors of the Zero current disjunction of disjunction when zero crossing of three-phase electricity; When device comes into operation, by single-chip microcomputer to the continuous sampling of supply voltage and phase place, comparison, record and wait for stop signal.Single-chip microcomputer can carry out Zero current disjunction according to three contacts of best disjunction phase angle wheel current control when receiving the disjunction instruction, reduced spark energy, realizes that non-arc breaking is disconnected.Lossless operation, the useful life of greatly having improved equipment.The present invention by single-chip microcomputer to the continuous sampling of supply voltage and phase place, comparison, record and wait for stop signal.Single-chip microcomputer is being received disjunction when instruction, can carry out disjunction when the zero crossing according to three contacts of best disjunction phase sequence control, has reduced spark energy, realizes the disconnected and tentaculum lossless operation of zero current non-arc breaking.
Effect of the present invention
1, adopt high-performance CPU to carry out voltage acquisition, zero current judgement, the phase angle computing makes and precise control, reliable has realized disjunction control intellectualized operation.
2, equipment is carried out Zero current disjunction, reduced spark energy, realize that no arc can't harm disjunction.
3, effectively increased the Control current of vacuum tube, greatly prolonged the vacuum tube life-span.
4, improved the device security performance.
Description of drawings
Fig. 1 is a circuit diagram of the present invention.
Embodiment
The AC vacuum contactor of Zero current disjunction includes base, and said base is provided with three vacuum switch tubes; And respectively with three pull-in windings of three vacuum tube corresponding matching, said each vacuum switch tube one end be provided with the high-tension electricity triple line in the terminals that phase line is connected, also be provided with on the base and three vacuum switch tubes, three intelligence controlling devices of corresponding matching respectively; Intelligence controlling device comprises that model is the PIC single-chip microcomputer of 16F628A and with the voltage transformer that power supply links to each other, be connected with pull-up resistor R146 on the pin 1 of PIC single-chip microcomputer after, be connected to power supply through lead again; The pin 2 of PIC single-chip microcomputer is connected with identical series arm through lead respectively with pin 3, and series arm comprises that model is two-way operational amplifier U14C and the U14D of LM2902, after the output of two two-way operational amplifiers is connected with resistance R 191 and R192; Being connected to corresponding model through resistance respectively again is six inverter triggers of 74LS14, and the output of two six inverter triggers is connected to the pin 2 and pin 3 of PIC single-chip microcomputer respectively through lead, also have lead to draw between resistance R 191 and R192 and six inverter triggers; Draw and be connected with ground connection behind capacitor C 30 and the C31 on the lead, the in-phase input end ground connection of the two-way operational amplifier U14D that connects with pin 3, the reverse inter-input-ing ending grounding of the two-way operational amplifier U14C that connects with pin 2; Two two-way operational amplifier U14C and another in-phase input end of U14D and inverting input also are connected on the terminals of same capacitor C 28 through lead respectively, also have lead to draw between two-way operational amplifier U14C in capacitor C 28 and the series arm and the U14D, draw and are connected with resistance R 189 back ground connection on the lead; After capacitor C 28 another terminals were connected with resistance R 187 through lead, the output of the two-way operational amplifier U14B that to be connected to the 3rd model again be LM2902 also had lead to draw between capacitor C 28 and the said resistance R 187; Draw lead and be connected with capacitor C 29 back ground connection, the in-phase input end of the 3rd two-way operational amplifier U14B has two leads to draw, and draws for one and is connected with capacitor C 20 back ground connection on the lead; After another root is drawn and is connected with two resistance R of connecting each other 108 and R107 on the lead; The output of the two-way operational amplifier U14A that to be connected to the 4th model again be LM2902 has two leads to draw on the inverting input of the 3rd two-way operational amplifier U14B, be connected with resistance R 115 back ground connection on the lead; Another root lead is connected with the output that is connected to the 3rd two-way operational amplifier U14B after the resistance R 88 again; The output of the 3rd two-way operational amplifier U14B also has two leads to draw, and draws after lead is connected with two resistance R 40 and R145, is connected on the pin 1 of PIC single-chip microcomputer again for one; There is lead to draw between two resistance R 40 and the R145; Draw and be connected with ground connection behind mutual series connection two diode Z28 in the opposite direction and the Z29 on the lead, another root on the output of the 3rd two-way operational amplifier U14B is drawn after lead is connected with capacitor C 19, is connected on the in-phase input end of the 3rd two-way operational amplifier two more each other between the resistance R 108 and R107 of series connection; The in-phase input end of the 4th two-way operational amplifier U14A is connected with ground connection behind the pull-up resistor R185; There are two leads to draw on the inverting input, draw after lead is connected with resistance R 184, be connected to voltage transformer again for one; Another root is drawn lead and is connected with the output that is connected to the 4th two-way operational amplifier U14A after the resistance R 244 again, and two power ends of the 4th two-way operational amplifier U14A connect positive-negative power respectively.
Also include two and isolate optocoupler OP1 and OP2; The pin 11 of PIC single-chip microcomputer is connected with the collector electrode of triode among the OP2 with two isolation optocoupler OP1 through lead respectively with pin 13; Two emitters of isolating triode among optocoupler OP1 and the OP2 are respectively through lead ground connection; Also there is lead to draw respectively on the collector electrode that two are isolated the triode among optocoupler OP1 and the OP2; Draw after lead is connected to pull-up resistor R1 and R2; Be connected to power supply again, two anodes of isolating the light-emitting diode among optocoupler OP1 and the OP2 have lead to draw respectively, draw for two and are connected to power supply again after lead is connected to pull-up resistor respectively; Two negative electrodes of isolating light-emitting diode among optocoupler OP1 and the OP2 are connected on two pins 3 and 4 of plug connector CON4 of one four pin through lead respectively, and two other pin one and 2 of the plug connector CON4 of four pin passes through lead ground connection respectively.
Claims (1)
1. the AC vacuum contactor of Zero current disjunction includes base, and said base is provided with three vacuum switch tubes; And respectively with three pull-in windings of three vacuum tube corresponding matching, said each vacuum switch tube one end be provided with the high-tension electricity triple line in the terminals that phase line is connected, also be provided with on the base and three vacuum switch tubes, three intelligence controlling devices of corresponding matching respectively; Intelligence controlling device comprises that model is the PIC single-chip microcomputer of 16F628A and with the voltage transformer that power supply links to each other, be connected with pull-up resistor R146 on the pin 1 of PIC single-chip microcomputer after, be connected to power supply through lead again; The pin 2 of PIC single-chip microcomputer is connected with identical series arm through lead respectively with pin 3, and series arm comprises that model is two-way operational amplifier U14C and the U14D of LM2902, after the output of two two-way operational amplifiers is connected with resistance R 191 and R192; Being connected to corresponding model through resistance respectively again is six inverter triggers of 74LS14, and the output of two six inverter triggers is connected to the pin 2 and pin 3 of PIC single-chip microcomputer respectively through lead, also have lead to draw between resistance R 191 and R192 and six inverter triggers; Draw and be connected with ground connection behind capacitor C 30 and the C31 on the lead, the in-phase input end ground connection of the two-way operational amplifier U14D that connects with pin 3, the reverse inter-input-ing ending grounding of the two-way operational amplifier U14C that connects with pin 2; Two two-way operational amplifier U14C and another in-phase input end of U14D and inverting input also are connected on the terminals of same capacitor C 28 through lead respectively, also have lead to draw between two-way operational amplifier U14C in capacitor C 28 and the series arm and the U14D, draw and are connected with resistance R 189 back ground connection on the lead; After capacitor C 28 another terminals were connected with resistance R 187 through lead, the output of the two-way operational amplifier U14B that to be connected to the 3rd model again be LM2902 also had lead to draw between capacitor C 28 and the said resistance R 187; Draw lead and be connected with capacitor C 29 back ground connection, the in-phase input end of the 3rd two-way operational amplifier U14B has two leads to draw, and draws for one and is connected with capacitor C 20 back ground connection on the lead; After another root is drawn and is connected with two resistance R of connecting each other 108 and R107 on the lead; The output of the two-way operational amplifier U14A that to be connected to the 4th model again be LM2902 has two leads to draw on the inverting input of the 3rd two-way operational amplifier U14B, be connected with resistance R 115 back ground connection on the lead; Another root lead is connected with the output that is connected to the 3rd two-way operational amplifier U14B after the resistance R 88 again; The output of the 3rd two-way operational amplifier U14B also has two leads to draw, and draws after lead is connected with two resistance R 40 and R145, is connected on the pin 1 of PIC single-chip microcomputer again for one; There is lead to draw between two resistance R 40 and the R145; Draw and be connected with ground connection behind mutual series connection two diode Z28 in the opposite direction and the Z29 on the lead, another root on the output of the 3rd two-way operational amplifier U14B is drawn after lead is connected with capacitor C 19, is connected on the in-phase input end of the 3rd two-way operational amplifier two more each other between the resistance R 108 and R107 of series connection; The in-phase input end of the 4th two-way operational amplifier U14A is connected with ground connection behind the pull-up resistor R185; There are two leads to draw on the inverting input, draw after lead is connected with resistance R 184, be connected to voltage transformer again for one; Another root is drawn lead and is connected with the output that is connected to the 4th two-way operational amplifier U14A after the resistance R 244 again, and two power ends of the 4th two-way operational amplifier U14A connect positive-negative power respectively;
Pin 5 ground connection of said PIC single-chip microcomputer, be connected with resistance R 50 on the pin 9 after, be connected to the base stage of first triode Q6 again; Have two leads to draw on the collector electrode of first triode Q6, draw for one and be connected to power supply again after being connected with pull-up resistor R39 on the lead, another root is drawn and is connected on the base stage of second triode Q4 after lead is connected with resistance R 48 again; Also have lead to draw between the grounded emitter of first triode Q6, the base stage of second triode Q4 and its resistance R that is connected 48, draw lead and be connected with ground connection behind the diode D6; The grounded emitter of second triode Q4 has lead to draw on the collector electrode of second triode Q4, draws lead and is connected on the pin 2 of photoelectrical coupler that model is MOC3081; There is lead to draw on the pin 1 of photoelectrical coupler, draws after lead is connected with resistance R 34, be connected to power supply again; There are two leads to draw on the pin 4 of photoelectrical coupler; Draw the control that lead is connected to bidirectional triode thyristor for one and extremely go up, another root is drawn and is connected with resistance R 44 on the lead, and resistance R 44 other ends have three leads to draw; Drawing lead for one is connected on the second plate of bidirectional triode thyristor; After the capacitor C 26 that is connected with series connection on second lead and the resistance R 42, be connected to first terminals of pull-in winding again, the 3rd lead is connected on the pin one of plug connector CON2 of one two pin; There is lead to draw on the pin 6 of photoelectrical coupler; Draw lead and be connected to terminals of resistance R 28, resistance R 28 another terminals have two leads to draw, and a lead is connected on the first anode of bidirectional triode thyristor; Another root lead is connected to first terminals of pull-in winding, and second terminals of pull-in winding are connected with another pin two of the plug connector CON2 of two pin through lead;
Also include two and isolate optocoupler OP1 and OP2; The pin 11 of PIC single-chip microcomputer is connected with the collector electrode of triode among the OP2 with two isolation optocoupler OP1 through lead respectively with pin 13; Two emitters of isolating triode among optocoupler OP1 and the OP2 are respectively through lead ground connection; Also there is lead to draw respectively on the collector electrode that two are isolated the triode among optocoupler OP1 and the OP2; Draw after lead is connected to pull-up resistor R1 and R2; Be connected to power supply again, two anodes of isolating the light-emitting diode among optocoupler OP1 and the OP2 have lead to draw respectively, draw for two and are connected to power supply again after lead is connected to pull-up resistor respectively; Two negative electrodes of isolating light-emitting diode among optocoupler OP1 and the OP2 are connected on two pins 3 and 4 of plug connector CON4 of one four pin through lead respectively, and two other pin one and 2 of the plug connector CON4 of four pin passes through lead ground connection respectively.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200910116686XA CN101546670B (en) | 2009-04-30 | 2009-04-30 | Zero current disjunction AC vacuum contactor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200910116686XA CN101546670B (en) | 2009-04-30 | 2009-04-30 | Zero current disjunction AC vacuum contactor |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101546670A CN101546670A (en) | 2009-09-30 |
| CN101546670B true CN101546670B (en) | 2012-01-04 |
Family
ID=41193724
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN200910116686XA Expired - Fee Related CN101546670B (en) | 2009-04-30 | 2009-04-30 | Zero current disjunction AC vacuum contactor |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN101546670B (en) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102556400A (en) * | 2010-12-30 | 2012-07-11 | 上海古鳌电子科技股份有限公司 | Control circuit for ironing head of note bundling machine |
| CN102709899A (en) * | 2012-06-06 | 2012-10-03 | 淄博联诚电力科技有限公司 | Intelligent arc extinction and resonance extinction overvoltage protection integral optimization device |
| CN110556267B (en) * | 2019-10-12 | 2021-08-31 | 福州大学 | Self-adaptive synchronous control method of parallel three-phase alternating current contactor |
| CN114415580B (en) * | 2022-03-31 | 2022-06-14 | 南京全宁电器有限公司 | Control method of arc-free disjunction alternating current circuit |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2609162Y (en) * | 2003-02-25 | 2004-03-31 | 刘年根 | Monolithic program controlled AC contactor |
| US20060061920A1 (en) * | 2004-09-22 | 2006-03-23 | Sheir Chun Lam | Low arc AC contactor |
-
2009
- 2009-04-30 CN CN200910116686XA patent/CN101546670B/en not_active Expired - Fee Related
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2609162Y (en) * | 2003-02-25 | 2004-03-31 | 刘年根 | Monolithic program controlled AC contactor |
| US20060061920A1 (en) * | 2004-09-22 | 2006-03-23 | Sheir Chun Lam | Low arc AC contactor |
Also Published As
| Publication number | Publication date |
|---|---|
| CN101546670A (en) | 2009-09-30 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| EP3745440A1 (en) | Oscillating dc circuit breaker based on vacuum interupter with magnetic blow intergrated and breaking method thereof | |
| CN101546670B (en) | Zero current disjunction AC vacuum contactor | |
| CN206962457U (en) | The new fling-cut switch of secondary capacitor | |
| CN206401236U (en) | A kind of relay zero-crossing closes disconnecting circuit | |
| CN206195342U (en) | Electric protection circuit and intelligence switch are got to single fire closed state | |
| CN207834197U (en) | A kind of arc-suppression circuit and arc extinguishing DC relay of DC relay | |
| CN103633891A (en) | Prompt braking device of three-station isolation grounding switch operating mechanism motor | |
| CN203205850U (en) | Breaker tripping coil protector for | |
| CN204882821U (en) | Killer switch state detection circuitry | |
| CN204189698U (en) | A kind of Standard type intelligent breaker complete set of equipments of self-supply power source | |
| CN213635774U (en) | Zero switching circuit of miniature circuit breaker | |
| CN201733105U (en) | Low-voltage intelligent phase-selection switch | |
| CN203643814U (en) | Digital quantity output circuit and digital quantity output board card | |
| CN203387191U (en) | High-order energy taking and fiber triggering system for high-voltage reactive power compensator | |
| CN203118869U (en) | Relay control circuit | |
| CN205985613U (en) | Socket safety device | |
| CN207572981U (en) | Power-capacitance hurl-slices switch and capacitor compensation cabinet | |
| CN206272139U (en) | A kind of electronic type of distribution terminal it is anti-jump and point, combined floodgate monitoring arrangement | |
| CN101587786A (en) | A kind of switch arc suppression circuit for switch devices and control method thereof | |
| CN201465837U (en) | Switch arc-suppressing circuit | |
| CN209461380U (en) | The control circuit of magnetic latching relay | |
| CN204815495U (en) | Fire control linkage drive circuit | |
| CN201478785U (en) | Multifunctional zero interruption leakage protective switch | |
| CN205159898U (en) | Intelligent load switch complete sets on outdoor post of confession power | |
| CN203180519U (en) | Neutral point grounding switch equipment set for 20kV power grid |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20120104 Termination date: 20150430 |
|
| EXPY | Termination of patent right or utility model |