CN204696533U - The electric blocking circuit of Medium Voltage Switchgear - Google Patents
The electric blocking circuit of Medium Voltage Switchgear Download PDFInfo
- Publication number
- CN204696533U CN204696533U CN201520182483.1U CN201520182483U CN204696533U CN 204696533 U CN204696533 U CN 204696533U CN 201520182483 U CN201520182483 U CN 201520182483U CN 204696533 U CN204696533 U CN 204696533U
- Authority
- CN
- China
- Prior art keywords
- circuit breaker
- circuit
- lead
- cabinet
- breaker
- 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
Landscapes
- Keying Circuit Devices (AREA)
Abstract
An electric blocking circuit for Medium Voltage Switchgear, is characterized in that: realize electric blocking by the first locked loop, the second locked loop and the 3rd locked loop of working in coordination; First locked loop comprises being serially connected in and controls the first circuit breaker between power positive cathode, the auxiliary normally closed contact of lead-in circuit breaker, latching electromagnet and the second circuit breaker, the closing circuit of access lead-in circuit breaker cabinet after the latched position travel switch of isolation handcart and service position travel switch serial connection; Second locked loop includes the 3rd circuit breaker and the 4th circuit breaker that are connected to and control power positive cathode, has been arranged in parallel the second locking closing circuit, the second locking trip(ping) circuit and negative control trip(ping) circuit between the 3rd circuit breaker and the 4th circuit breaker; 3rd locked loop includes the 5th circuit breaker and the 6th circuit breaker that are connected to and control power positive cathode, has been arranged in parallel the 3rd locking closing circuit and the 3rd locking trip(ping) circuit between described 5th circuit breaker and the 6th circuit breaker.The utility model circuit design cost is low, reliability is high, considers more comprehensively, electric anti-error more remarkable effect to whole medium-voltage distribution room electric blocking.
Description
Technical field
The utility model relates to a kind of electric blocking technical field, particularly relates to a kind of electric blocking circuit of Medium Voltage Switchgear.
Background technology
The electric blocking of switch cubicle mainly can prevent electric misoperation, and the setting of electric blocking can ensure the operation that switch cubicle is safe, stable, reliable and orderly, to ensure the regular supply of electric power.
The electric blocking of Medium Voltage Switchgear is a part for particular importance in the design of Medium Voltage Switchgear secondary circuit, and whether the design of electric blocking is reliable, directly affects the normal operation of Medium Voltage Switchgear and the normal power supply to user.Nowadays the Medium Voltage Switchgear on market does not realize complete electric blocking completely and arranges, although there is partial switch cabinet to devise electric blocking, consider not be very comprehensive, electric anti-error effect is not fairly obvious and desirable yet, therefore, need to make further improvement.
Utility model content
Technical problem to be solved in the utility model provides a kind of secondary connection convenient for above-mentioned prior art present situation and the electric blocking circuit of the more comprehensive Medium Voltage Switchgear reliably of electric anti-error effect.
The utility model solves the problems of the technologies described above adopted technical scheme: a kind of electric blocking circuit of Medium Voltage Switchgear, and described Medium Voltage Switchgear includes lead-in circuit breaker cabinet, feed isolating cabinet, mother stock breaker cabinet, mother stock isolation cabinet and metering cabinet;
It is characterized in that: between described lead-in circuit breaker cabinet, feed isolating cabinet, mother stock breaker cabinet, mother stock isolation cabinet and metering cabinet, realize electric blocking by the first locked loop, the second locked loop and the 3rd locked loop of working in coordination;
Wherein, described first locked loop includes to be serially connected in and controls the first circuit breaker between power positive cathode, the auxiliary normally closed contact of lead-in circuit breaker, latching electromagnet and the second circuit breaker, the closing circuit of access lead-in circuit breaker cabinet after the latched position travel switch of isolation handcart and service position travel switch serial connection;
Described second locked loop includes the 3rd circuit breaker and the 4th circuit breaker that are connected to and control power positive cathode, the second locking closing circuit, the second locking trip(ping) circuit and negative control trip(ping) circuit has been arranged in parallel between described 3rd circuit breaker and the 4th circuit breaker, wherein, described second locking closing circuit includes the protective device combined floodgate interface be connected in series successively, the latched position travel switch of isolating handcart, isolation the service position travel switch of handcart, the auxiliary normally closed contact of mother stock circuit breaker and lead-in circuit breaker closing coil; Described second locking trip(ping) circuit includes and is connected in series protective device tripping operation interface and lead-in circuit breaker switching winding successively; One end of described negative control trip(ping) circuit is connected on described 3rd circuit breaker, and the other end is connected between described protective device tripping operation interface and the auxiliary normal opened contact of lead-in circuit breaker;
Described 3rd locked loop includes the 5th circuit breaker and the 6th circuit breaker that are connected to and control power positive cathode, the 3rd locking closing circuit and the 3rd locking trip(ping) circuit has been arranged in parallel between described 5th circuit breaker and the 6th circuit breaker, wherein, described 3rd locking closing circuit includes the protective device combined floodgate interface be connected in series successively, the latched position travel switch of isolation handcart, the service position travel switch of isolation handcart, the auxiliary normally-open normally-close interlocking contact of 1# lead-in circuit breaker, the auxiliary normally-open normally-close interlocking contact of 2# lead-in circuit breaker and mother stock breaker closing coil, the auxiliary normal opened contact of 1# lead-in circuit breaker and the auxiliary normally closed contact serial connection of 2# lead-in circuit breaker, the auxiliary normally closed contact of 1# lead-in circuit breaker and the auxiliary normal opened contact serial connection of 2# lead-in circuit breaker, described 3rd locking trip(ping) circuit includes the protective device tripping operation interface and mother stock breaker open operation coil that are connected in series successively.
As preferably, described second locking closing circuit is serially connected with the auxiliary normally closed contact of a lead-in circuit breaker before described lead-in circuit breaker closing coil.
Preferred as another, described 3rd locking closing circuit is serially connected with the auxiliary normally closed contact of a mother stock circuit breaker before described mother stock breaker closing coil.
Add corresponding circuit breaker before the closing coil of above-mentioned lead-in circuit breaker or mother stock circuit breaker respectively and assist normally closed contact, guarantee to only have circuit breaker separating brake time could close a floodgate, thus prevent circuit breaker from repeatedly repeating to close a floodgate.
As preferably, described second locking trip(ping) circuit is serially connected with the auxiliary normal opened contact of a lead-in circuit breaker before described lead-in circuit breaker switching winding.
Preferred as another, described 3rd locking trip(ping) circuit is serially connected with the auxiliary normal opened contact of a mother stock circuit breaker before described mother stock breaker open operation coil.
Add corresponding circuit breaker before the switching winding of above-mentioned lead-in circuit breaker or mother stock circuit breaker respectively and assist normal opened contact, guaranteeing only could separating brake when circuit breaker closes a floodgate.Thus prevent circuit breaker from repeatedly repeating separating brake.
As preferably, the first described locked loop can be arranged on described feed isolating cabinet, also can be arranged among described mother stock isolation cabinet.
As preferably, the second described locked loop can be arranged among described lead-in circuit breaker cabinet.
As preferably, the 3rd described locked loop can be arranged among described mother stock breaker cabinet.
Compared with prior art, the utility model has the advantage of: the secondary circuit design principle of the Medium Voltage Switchgear electric blocking of the application is understandable, secondary connection component number is few, easy-to-connect, and then make that overall circuit design cost is low, reliability is high, consider more comprehensively to whole medium-voltage distribution room electric blocking, electric anti-error more remarkable effect.
Accompanying drawing explanation
Fig. 1 is that the inlet wire (mother stock) of the utility model embodiment isolates cabinet electric blocking figure.
Fig. 2 is the lead-in circuit breaker cabinet electric blocking figure of the utility model embodiment.
Fig. 3 is the mother stock breaker cabinet electric blocking figure of the utility model embodiment.
Embodiment
Below in conjunction with accompanying drawing embodiment, the utility model is described in further detail.
Present embodiment discloses a kind of electric blocking scheme of Medium Voltage Switchgear, this Medium Voltage Switchgear includes lead-in circuit breaker cabinet, feed isolating cabinet, mother stock breaker cabinet, mother stock isolation cabinet and metering cabinet five kinds of cabinets, the first locked loop by working in coordination between above-mentioned five kinds of cabinets, second locked loop and the 3rd locked loop realize the electric blocking between lead-in circuit breaker cabinet and feed isolating cabinet respectively, mother stock breaker cabinet and mother stock isolate the electric blocking between cabinet, electric blocking between two lead-in circuit breaker cabinets and a mother stock breaker cabinet, and the electric blocking between the metering cabinet of lead-in circuit breaker cabinet and respective bus bars section.
Wherein, the first locked loop can be arranged on feed isolating cabinet or be arranged among mother stock isolation cabinet; First locked loop includes to be serially connected in and controls the first circuit breaker ZK1 between power positive cathode, auxiliary normally closed contact QF, the latching electromagnet GDS of lead-in circuit breaker and the second circuit breaker ZK2, the closing circuit of access lead-in circuit breaker cabinet after the latched position travel switch SD of isolation handcart and service position travel switch S9 is connected in series;
The physical circuit figure of the first locked loop, as shown in Figure 1, between wire size 881 and 883, an auxiliary normally closed contact QF of access inlet wire (mother stock) circuit breaker, when circuit breaker is in gate-dividing state, this contact QF closes, latching electromagnet GDS is energized unblock, and isolation handcart can pull out; If inlet wire (mother stock) circuit breaker is not in gate-dividing state, then inlet wire (mother stock) is isolated handcart and can not be pulled out.After the latched position travel switch SD of isolation handcart and the service position travel switch S9 of isolation handcart is connected in series, the closing circuit of access inlet wire (mother stock) breaker cabinet, only have isolation handcart when the service position locked, corresponding circuit breaker could close a floodgate; If isolation handcart is not in the service position of locking, then corresponding circuit breaker can not close a floodgate.Wire size 103 1# lead-in circuit breaker corresponding to 105 cabinet; wire size 203 2# lead-in circuit breaker corresponding to 205 cabinet; wire size 303 mother stock breaker cabinet corresponding to 305, wire size 801,807 and 809 accesses the On-off signal loop of microcomputer protecting device respectively, with the position of detection and isolation handcart.
Second locked loop is arranged among lead-in circuit breaker cabinet, second locked loop includes the 3rd circuit breaker ZK3 and the 4th circuit breaker ZK4 that are connected to and control power positive cathode, the second locking closing circuit has been arranged in parallel between 3rd circuit breaker ZK3 and the 4th circuit breaker ZK4, second locking trip(ping) circuit and negative control trip(ping) circuit, wherein, second locking closing circuit includes the protective device combined floodgate interface be connected in series successively, the latched position travel switch SD of isolation handcart, the service position travel switch S9 of isolation handcart, the auxiliary normally closed contact 3QF of mother stock circuit breaker, the auxiliary normally closed contact QF of lead-in circuit breaker and lead-in circuit breaker closing coil XF, second locking trip(ping) circuit includes auxiliary normal opened contact QF and the lead-in circuit breaker switching winding MX1 of serial connection protective device tripping operation interface, lead-in circuit breaker successively, one end of negative control trip(ping) circuit is connected on the 3rd circuit breaker ZK3, and the other end is connected between protective device tripping operation interface and the auxiliary normal opened contact QF of lead-in circuit breaker,
The physical circuit figure of the second locked loop, as shown in Figure 2, in the combined floodgate pitch of the laps loop of lead-in circuit breaker cabinet, access inlet wire isolation latched position travel switch SD, the service position travel switch S9 of handcart and the auxiliary normally closed contact 3QF of mother stock circuit breaker, only have when isolating handcart and meet in open position (namely 3QF closes) these two conditions in the service position (namely SD and S9 closes) locked and mother stock circuit breaker simultaneously simultaneously, lead-in circuit breaker could close a floodgate.Correspondingly, an auxiliary normal opened contact of lead-in circuit breaker and auxiliary normally closed contact (i.e. wire size 305 shown in Fig. 2,307,309 and 311) will access the closing circuit of mother stock breaker cabinet; An auxiliary normally closed contact of lead-in circuit breaker will access the locked loop of inlet wire isolation handcart, the wire size 881 and 883 namely shown in Fig. 2; In two lead-in circuit breaker cabinet sub-gate circuits, the separating brake contact of access metering cabinet load-control equipment, so that power supply administration carries out negative control operation.The lead-in circuit breaker cabinet of the corresponding I section bus of wire size 101 and 133 in Fig. 2, i.e. 1# lead-in circuit breaker cabinet; The lead-in circuit breaker cabinet of the corresponding II section bus of wire size 201 and 233, i.e. 2# lead-in circuit breaker cabinet; Equally, often open the load-control equipment that auxiliary contact gives respective bus bars section metering cabinet for one of two lead-in circuit breakers, to feed back the switching signal of lead-in circuit breaker, i.e. wire size X1 and X2 in Fig. 2.
3rd locked loop is arranged among described mother stock breaker cabinet, 3rd locked loop includes the 5th circuit breaker ZK5 and the 6th circuit breaker ZK6 that are connected to and control power positive cathode, the 3rd locking closing circuit and the 3rd locking trip(ping) circuit has been arranged in parallel between 5th circuit breaker ZK5 and the 6th circuit breaker ZK6, wherein, 3rd locking closing circuit includes the protective device combined floodgate interface be connected in series successively, the latched position travel switch SD of isolation handcart, the service position travel switch S9 of isolation handcart, the auxiliary normally-open normally-close interlocking contact 1QF of 1# lead-in circuit breaker, the auxiliary normally-open normally-close interlocking contact 2QF of 2# lead-in circuit breaker, the auxiliary normally closed contact QF3 of mother stock circuit breaker and mother stock breaker closing coil XF ', the auxiliary normal opened contact of 1# lead-in circuit breaker and the auxiliary normally closed contact serial connection of 2# lead-in circuit breaker, the auxiliary normally closed contact of 1# lead-in circuit breaker and the auxiliary normal opened contact serial connection of 2# lead-in circuit breaker, described 3rd locking trip(ping) circuit includes the protective device tripping operation interface, the auxiliary normal opened contact QF3 of mother stock circuit breaker and mother stock breaker open operation coil MX1 ' that are connected in series successively.
The physical circuit figure of the 3rd locked loop, as shown in Figure 3, in the closing circuit of mother stock breaker cabinet, the auxiliary normally-open normally-close interlocking contact 2QF of the latched position travel switch SD of access mother stock isolation handcart, the auxiliary normally-open normally-close interlocking contact 1QF of service position travel switch S9,1# lead-in circuit breaker and 2# lead-in circuit breaker; Only has isolation handcart in the service position (namely SD and S9 closes) of locking simultaneously, simultaneously, 1# lead-in circuit breaker closes a floodgate and 2# lead-in circuit breaker separating brake (or 2# lead-in circuit breaker closes a floodgate and 1# lead-in circuit breaker separating brake), when above-mentioned condition meets simultaneously, mother stock circuit breaker could close a floodgate.Three of this two inlet wire one mother stocks are adopted to close two electric blockings, under any circumstance, two can only be closed in two lead-in circuit breakers and a mother stock circuit breaker, other one is in gate-dividing state, to realize a transformer or an other whole load of transformer belt, or the mode of operation of two transformers respectively with oneself load.
Correspondingly, the auxiliary normally closed contact 3QF of mother stock circuit breaker two will access the closing circuit of 1# lead-in circuit breaker cabinet and 2# lead-in circuit breaker cabinet respectively, as shown in wire size in Fig. 3 105,107 and 205,207.An auxiliary normally closed 3QF of mother stock circuit breaker also needs access mother stock isolation handcart locked loop, i.e. wire size 881 shown in Fig. 3 and 883.
In above-mentioned Fig. 2 and Fig. 3, closing coil XF (the closing coil XF ' of mother stock circuit breaker) the front auxiliary normally closed contact adding circuit breaker of lead-in circuit breaker, ensure circuit determine circuit breaker separating brake time could close a floodgate; Switching winding MX1 (the switching winding MX1 ' of mother stock circuit breaker) the front auxiliary normal opened contact adding circuit breaker of lead-in circuit breaker, ensure that circuit could separating brake when determining that circuit breaker closes a floodgate, thus prevent circuit breaker from repeatedly repeating to close a floodgate or separating brake, extend circuit breaker useful life, ensure the stability of equipment work.
The Medium Voltage Switchgear electric blocking circuit design of the present embodiment considers that electric anti-error effect comparatively prior art is more remarkable and desirable comprehensively, thus more meets " five prevent " requirement of Medium Voltage Switchgear.Not only having ensured and the operation that switchgear house Medium Voltage Switchgear is safe, stable, reliable and orderly also assures that the normal electricity supply to user, is a kind of desirable electric blocking scheme.
Claims (8)
1. an electric blocking circuit for Medium Voltage Switchgear, described Medium Voltage Switchgear includes lead-in circuit breaker cabinet, feed isolating cabinet, mother stock breaker cabinet, mother stock isolation cabinet and metering cabinet;
It is characterized in that: between described lead-in circuit breaker cabinet, feed isolating cabinet, mother stock breaker cabinet, mother stock isolation cabinet and metering cabinet, realize electric blocking by the first locked loop, the second locked loop and the 3rd locked loop of working in coordination;
Wherein, described first locked loop includes to be serially connected in and controls the first circuit breaker between power positive cathode, the auxiliary normally closed contact of lead-in circuit breaker, latching electromagnet and the second circuit breaker, the closing circuit of access lead-in circuit breaker cabinet after the latched position travel switch of isolation handcart and service position travel switch serial connection;
Described second locked loop includes the 3rd circuit breaker and the 4th circuit breaker that are connected to and control power positive cathode, the second locking closing circuit, the second locking trip(ping) circuit and negative control trip(ping) circuit has been arranged in parallel between described 3rd circuit breaker and the 4th circuit breaker, wherein, described second locking closing circuit includes the protective device combined floodgate interface be connected in series successively, the latched position travel switch of isolating handcart, isolation the service position travel switch of handcart, the auxiliary normally closed contact of mother stock circuit breaker and lead-in circuit breaker closing coil; Described second locking trip(ping) circuit includes and is connected in series protective device tripping operation interface and lead-in circuit breaker switching winding successively; One end of described negative control trip(ping) circuit is connected on described 3rd circuit breaker, and the other end is connected between described protective device tripping operation interface and the auxiliary normal opened contact of lead-in circuit breaker;
Described 3rd locked loop includes the 5th circuit breaker and the 6th circuit breaker that are connected to and control power positive cathode, the 3rd locking closing circuit and the 3rd locking trip(ping) circuit has been arranged in parallel between described 5th circuit breaker and the 6th circuit breaker, wherein, described 3rd locking closing circuit includes the protective device combined floodgate interface be connected in series successively, the latched position travel switch of isolation handcart, the service position travel switch of isolation handcart, the auxiliary normally-open normally-close interlocking contact of 1# lead-in circuit breaker, the auxiliary normally-open normally-close interlocking contact of 2# lead-in circuit breaker and mother stock breaker closing coil, the auxiliary normal opened contact of 1# lead-in circuit breaker and the auxiliary normally closed contact serial connection of 2# lead-in circuit breaker, the auxiliary normally closed contact of 1# lead-in circuit breaker and the auxiliary normal opened contact serial connection of 2# lead-in circuit breaker, described 3rd locking trip(ping) circuit includes the protective device tripping operation interface and mother stock breaker open operation coil that are connected in series successively.
2. the electric blocking circuit of Medium Voltage Switchgear according to claim 1, is characterized in that: described second locking closing circuit is serially connected with the auxiliary normally closed contact of a lead-in circuit breaker before described lead-in circuit breaker closing coil.
3. the electric blocking circuit of Medium Voltage Switchgear according to claim 1, is characterized in that: described 3rd locking closing circuit is serially connected with the auxiliary normally closed contact of a mother stock circuit breaker before described mother stock breaker closing coil.
4. the electric blocking circuit of Medium Voltage Switchgear according to claim 1, is characterized in that: described second locking trip(ping) circuit is serially connected with the auxiliary normal opened contact of a lead-in circuit breaker before described lead-in circuit breaker switching winding.
5. the electric blocking circuit of Medium Voltage Switchgear according to claim 1, is characterized in that: described 3rd locking trip(ping) circuit is serially connected with the auxiliary normal opened contact of a mother stock circuit breaker before described mother stock breaker open operation coil.
6. the electric blocking circuit of Medium Voltage Switchgear according to claim 1, is characterized in that: the first described locked loop is arranged among described feed isolating cabinet or described mother stock isolation cabinet.
7. the electric blocking circuit of Medium Voltage Switchgear according to claim 1, is characterized in that: the second described locked loop is arranged among described lead-in circuit breaker cabinet.
8. the electric blocking circuit of Medium Voltage Switchgear according to claim 1, is characterized in that: the 3rd described locked loop is arranged among described mother stock breaker cabinet.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520182483.1U CN204696533U (en) | 2015-03-30 | 2015-03-30 | The electric blocking circuit of Medium Voltage Switchgear |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520182483.1U CN204696533U (en) | 2015-03-30 | 2015-03-30 | The electric blocking circuit of Medium Voltage Switchgear |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN204696533U true CN204696533U (en) | 2015-10-07 |
Family
ID=54236786
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201520182483.1U Expired - Fee Related CN204696533U (en) | 2015-03-30 | 2015-03-30 | The electric blocking circuit of Medium Voltage Switchgear |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN204696533U (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105374645A (en) * | 2015-11-19 | 2016-03-02 | 内蒙古电力勘测设计院有限责任公司 | Secondary circuit of handcart cabinet |
| CN108666920A (en) * | 2018-07-13 | 2018-10-16 | 河南森源电气股份有限公司 | A kind of PT hand car interlock circuit, PT hand car and metering cabinet |
| CN109659841A (en) * | 2018-12-19 | 2019-04-19 | 达实电力建设有限公司 | A kind of isolation cabinet secondary connection circuit |
| CN111129972A (en) * | 2019-12-30 | 2020-05-08 | 国网山东省电力公司淄博供电公司 | Anti-misoperation locking device for high-voltage cabinet door of box-type substation |
-
2015
- 2015-03-30 CN CN201520182483.1U patent/CN204696533U/en not_active Expired - Fee Related
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105374645A (en) * | 2015-11-19 | 2016-03-02 | 内蒙古电力勘测设计院有限责任公司 | Secondary circuit of handcart cabinet |
| CN105374645B (en) * | 2015-11-19 | 2018-05-25 | 内蒙古电力勘测设计院有限责任公司 | A kind of hands injured secondary circuit |
| CN108666920A (en) * | 2018-07-13 | 2018-10-16 | 河南森源电气股份有限公司 | A kind of PT hand car interlock circuit, PT hand car and metering cabinet |
| CN108666920B (en) * | 2018-07-13 | 2024-01-19 | 河南森源电气股份有限公司 | PT handcart interlocking circuit, PT handcart and metering cabinet |
| CN109659841A (en) * | 2018-12-19 | 2019-04-19 | 达实电力建设有限公司 | A kind of isolation cabinet secondary connection circuit |
| CN109659841B (en) * | 2018-12-19 | 2020-06-26 | 达实电力建设有限公司 | Secondary wiring circuit of isolation cabinet |
| CN111129972A (en) * | 2019-12-30 | 2020-05-08 | 国网山东省电力公司淄博供电公司 | Anti-misoperation locking device for high-voltage cabinet door of box-type substation |
| CN111129972B (en) * | 2019-12-30 | 2021-11-23 | 国网山东省电力公司淄博供电公司 | Anti-misoperation locking device for high-voltage cabinet door of box-type substation |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN204696533U (en) | The electric blocking circuit of Medium Voltage Switchgear | |
| CN203800695U (en) | Intelligent low-voltage dual power switching power distribution cabinet control device | |
| CN202712819U (en) | Protection system capable of realizing breaker failure triggering relevant trips of interconnecting transformer | |
| CN102779612A (en) | Pre-magnetizing device for main power supply transformer of electric power circuit | |
| CN204011150U (en) | Low-voltage distribution cabinet interlock control system | |
| CN203367780U (en) | Electrical closing blocking device | |
| CN106208106B (en) | A kind of paralleling compensating device based on compensation/current-limiting reactor | |
| CN201549865U (en) | 10-35KV circuit microcomputer protection reclosing device | |
| CN201860172U (en) | Automatic looped network type distribution network based on reclosers | |
| CN103840564A (en) | Remote control loop comprehensive misoperation-preventive locking device | |
| CN102693884A (en) | Special molded case circuit breaker for prepayment electric energy meter | |
| CN204012700U (en) | Power network neutral point grounding system | |
| CN202513106U (en) | Dedicated molded case circuit breaker for prepayment type electric energy meter | |
| CN203707759U (en) | TV parallel circuit preventing reverse charging | |
| CN207426679U (en) | Current quick-breaking locking prevents short circuit override tripping system | |
| CN207691414U (en) | A kind of high pressure protector | |
| WO2020082856A1 (en) | Quick switch module and high-voltage short circuit current limiting device, and control method thereof | |
| Li et al. | A novel substation area backup protection for smart substation | |
| CN205992735U (en) | A kind of paralleling compensating device based on compensation/current-limiting reactor | |
| CN204886117U (en) | Operation circuit of circuit breaker | |
| CN213989875U (en) | GCK low-voltage switchgear | |
| Wang et al. | Summary of superconducting fault current limiter technology | |
| CN204792536U (en) | Disconnected electrical interlocks of two unifications | |
| CN204615170U (en) | A kind of low-voltage complete switch equipment | |
| CN209389700U (en) | Trip(ping) circuit outside the extra-high voltage direct-current of optimization |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| 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: 20151007 |
|
| CF01 | Termination of patent right due to non-payment of annual fee |