CN103441466A - Automatic phase-failure zero-failure power-off protection device - Google Patents
Automatic phase-failure zero-failure power-off protection device Download PDFInfo
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Abstract
The invention provides an automatic phase-failure zero-failure power-off protection device which mainly comprises an automatic shunt excitation breaker and a plurality of control relays. Two switching circuits composed of contacts of two control relays in a combination mode provide two power supply return circuits for a shut excitation coil. When phase failure and zero failure do not exist, the two switching circuits are both in the disconnected state, no current passes through the shunt excitation coil and power is normally supplied. When phase failure and zero failure exist, one of the two switching circuits is connected, the shunt excitation coil is energized and the automatic shunt excitation breaker trips to conduct power-off protection. When a shell of a distribution box is energized, the third control relay is energized, a normally-closed contact of the third control relay is disconnected, the return circuit where the normally-closed contact is located is disconnected, the action effect is equal to that of the situation that phase failure and zero failure occur, the shunt excitation coil is energized, and the automatic shunt excitation breaker trips to conduct power-off protection. The automatic phase-failure zero-failure power-off protection device has the advantages of being simple in structure, few in used part, high in reliability, low in cost and the like.
Description
Technical field
The present invention relates to a kind of circuit protection device, particularly the phase shortage in a kind of three-phase and four-line supply line lacks zero automatic power-off protection device.
Background technology
In low-voltage distribution three-phase and four-line circuit, long-term existence, because of the potential safety hazard that power supply unit circuit breaking (phase shortage, scarce zero) fault produces, causes electric equipment, consuming device to damage; Generally take the zero line iterative earthing in the low-voltage distribution three-phase four-wire system, consumer unit, distribution box all will be established earth polar on the spot, purpose is to guarantee to be kept by earth electrode on the spot once neutral line break, this practice long-term existence potential safety hazard, once neutral line break earth electrode continuity simultaneously is bad, when even ground connection is broken already, will produce following potential safety hazard: some single-phase 220V loop can become 380V, causes electric equipment, utensil to burn out at short notice; Three-phase power 380V loop, because the Voltage unbalance motor power (output) descends, produces at short notice high temperature and burns out.
Some type products such as existing disconnected phase and phase order protection relay (XJ3, XJ3-G, XJ5) can play automatic trip power-off protection (it utilizes the tripping operation of A.C. contactor decompression or automatic circuit breaker band decompression tripgear) to power phase shortage; power supply is lacked to not protection of zero line; once simultaneously owing to generally there is no automatic switching-on device after contactor or circuit breaker trip; to manually arrive execute-in-place, not meet the continuous power reguirements of reliability.Low-voltage network circuit three-phase four-wire system (consumer unit, distribution box) does not possess the scarce zero auto-breaking defencive function of phase shortage at present, and its technology is blank at present.
Summary of the invention
In order to make up the deficiencies in the prior art; the technical problem to be solved in the present invention is to provide a kind of phase shortage and lacks zero automatic power-off protection device; in the low-voltage network three-phase four-wire system; phase line A, B, C appoint and lack one mutually or scarce zero line N; or distribution box housing is when charged; the circuit breaker outage of tripping immediately, thus avoid electric equipment to damage and prevent electric shock accidents.The technical characterstic of device: line outage is not tripped, and circuit telegram in reply does not trip, and the circuit phase shortage, while lacking zero, trips immediately, now will be after line fault be got rid of during normal power supply manually to execute-in-place, automatic circuit breaker is closed a floodgate.
In order to realize the foregoing invention purpose, the present invention proposes a kind of phase shortage and lack zero automatic power-off protection device, it is characterized in that: comprise automatic shunt circuit breaker, control relay one, control relay two; Automatically shunt circuit breaker accesses three-phase and four-line supply line, between any two phase lines of the control relay one automatic shunt circuit breaker leading-out terminal of access, between control relay two access phase lines of automatic shunt circuit breaker leading-out terminal residue and zero line; The grouping circuits that the shunt opening coil access control relay one of automatic shunt circuit breaker and the contact that control relay two provides form, to form two shunt opening coils of take automatic shunt circuit breaker be HW highway, the contact switch circuit in parallel with control relay one and control relay two respectively, be the shunt opening coil power supply;
The contact arrangement principle of described contact switch circuit is: one of them control relay provides two normally opened contacts and two normally-closed contacts, and another control relay provides a normally opened contact and a normally-closed contact; The both sides of two normally opened contact series connection access shunt opening coils of described last control relay, the normally-closed contact provided with another control relay forms the switching circuit in parallel with this control relay after connecting; The both sides of two normally-closed contact series connection access shunt opening coils of described last control relay, the normally opened contact provided with another control relay forms the switching circuit in parallel with another control relay after connecting;
When normal power supply, two contact switch circuits are off-state, and the shunt opening coil passes through without electricity; Lack zero or housing when charged when phase shortage occurs in power supply, wherein a contact switch circuit is by conducting, and the shunt opening coil obtains electric, automatically shunt circuit breaker tripping operation power-off protection.
Further, the present invention also comprises control relay three, and control relay three lacks zero automatic power-off protection device casing with an end after the fuse series connection and described phase shortage and is connected, and the other end is connected with zero line; The normally-closed contact of control relay three is connected with control relay one or control relay two.
Further, the concrete annexation of contact switch circuit of the present invention comprises following two kinds:
1) control relay one provides two normally opened contacts and two normally-closed contacts, and control relay two provides a normally opened contact and a normally-closed contact; Two normally opened contacts of control relay one are connected on shunt opening coil both sides, and the switching circuit that the normally-closed contact of the control relay two of connecting again in this series circuit forms is in parallel with control relay one; Two normally-closed contacts of control relay one are connected on shunt opening coil both sides, and the switching circuit that the normally opened contact of the control relay two of connecting again in this series circuit forms is in parallel with control relay two;
2) control relay two provides two normally opened contacts and two normally-closed contacts, and control relay one provides a normally opened contact and a normally-closed contact; Two normally opened contacts of control relay two are connected on shunt opening coil both sides, and the switching circuit that the normally-closed contact of the control relay one of connecting again in this series circuit forms is in parallel with control relay two; Two normally-closed contacts of control relay two are connected on shunt opening coil both sides, and the switching circuit that the normally opened contact of the control relay one of connecting again in this series circuit forms is in parallel with control relay one.
Further, the present invention also comprises three fuses and three indicator lights; Automatically all connect between every of end of incoming cables of shunt circuit breaker phase line and zero line and access a fuse, an indicator light and a relay normally-closed contact; Described normally-closed contact any or relay of arranging in addition in control relay one, control relay two provide.
Further, between any phase line of the above-mentioned automatic shunt circuit breaker leading-out terminal of the present invention and zero line, connect access fuse and indicator light.
Further, the present invention also comprises four circuit breakers; Respectively connect after a circuit breaker and access again between described two phase lines in control relay one two ends; Respectively connect after a circuit breaker and access again between described phase line and zero line in control relay two two ends.
In the present invention, key technology is to have utilized the shunt opening coil of automatic shunt circuit breaker can adapt to the characteristic that two kinds of voltages work the short time, adopt two switching circuits (circuit X-Y, circuit L-M) of the contact combination formation of two control relays to provide two operating voltages (220V, 380V) for the shunt opening coil; When power supply is normal, two switching circuits are off-state, and the shunt opening coil is failure to actuate; In the powered operation process, once power phase shortage or lack zero, in two switching circuits one by conducting, shunt opening coil energized action, shunt circuit breaker tripping operation power-off protection automatically; When consumer unit (distribution box) housing electrified voltage equals higher than AC36V; control relay three energized actions; its normally-closed contact disconnects; opened circuit in loop, normally-closed contact place (control relay one loop or control relay secondary circuit); action effect is equal to phase shortage and lacks zero situation; shunt opening coil energized action, shunt circuit breaker tripping operation power-off protection automatically.
Three phase shortage indicating circuits that fuse A, B, C and indicator light A, B, C and normally-closed contact form, exist in phase shortage or charged situation, should partly or entirely light, when not working, certain lamp means this phase phase shortage, once circuit breaker automatic trip, A, B, a C3 lamp mean that power supply is normal while all lighting, and belong to consumer unit, distribution box housing Issues on Static Electrification.
The powered operation indicating circuit that fuse R and indicator light R form, when normal power supply, indicator light R lights, and means that power supply is normal, when power supply phase shortage or casing are charged, extinguishes, and means abnormal electrical power supply.
Four miniature circuit breakers can be when the device maintenance being connected of complete disconnecting members and supply line; convenient and safe operation; simultaneously, can be used for the protective device reliability test, check consumer unit, distribution box are installed after this device in phase shortage and whether are lacked in zero or the charged situation of housing reliably working.
In sum; beneficial effect of the present invention is to adopt an automatic shunt circuit breaker and three scarce zero automatic power-off protection devices of phase shortage that control relay forms main circuit, has the advantages such as circuit structure is simple, the use parts are few, reliability is high, with low cost.
The accompanying drawing explanation
The line map that Fig. 1 is the embodiment of the present invention 1;
The line map that Fig. 2 is the embodiment of the present invention 2;
The line map that Fig. 3 is the embodiment of the present invention 3;
The line map that Fig. 4 is the embodiment of the present invention 4;
The line map that Fig. 5 is the embodiment of the present invention 5;
The line map that Fig. 6 is the embodiment of the present invention 6;
The line map that Fig. 7 is the embodiment of the present invention 7;
The line map that Fig. 8 is the embodiment of the present invention 8.
Wherein: the automatic shunt circuit breaker of QF-; The shunt opening coil of the automatic shunt circuit breaker of F-; KA-control relay one, KD-control relay two; FK-control relay three; ZK1-ZK4 is four circuit breakers; FUA-fuse A, FUB-fuse B, FUC-fuse C, FUR-fuse R, FUK-fuse K; The HR-indicator light; HA-indicator light A; HB-indicator light B, HC-indicator light C; The FL-distribution box housing.
Embodiment
Below in conjunction with accompanying drawing, the present invention is further illustrated.Each contact of implementing the closure state shown in illustration is normally-closed contact, refers to this contact normality for closed, at relay, obtains when electric and disconnects; The contact of the open mode shown in figure is normally opened contact, refers to this contact normality for disconnecting, and at relay, obtains closure when electric.
Embodiment 1
As Fig. 1 has provided the line map of a kind of specific embodiment of the present invention.In the present embodiment, KA1, KA3 are normally opened contact, and KA2, KA4 are normally-closed contact; KD2 is normally opened contact, and KD1, KD3, KD4, KD5 are normally-closed contact; FK1 is normally-closed contact.
The present embodiment comprises automatic shunt circuit breaker QF, control relay one KA, control relay two KD; Automatically shunt circuit breaker QF accesses three-phase power line, and control relay one KA accesses between automatic shunt circuit breaker QF leading-out terminal B, C phase line, and control relay two KD access between automatic shunt circuit breaker QF leading-out terminal residue A phase line and zero line N; Normally-closed contact KD1, the normally opened contact KA3 of control relay one KA of shunt opening coil F, control relay two KD of the normally opened contact KA1 of control relay one KA, automatic shunt circuit breaker QF sequentially connect, and the series circuit X-Y formed is in parallel with control relay one KA; Normally opened contact KD2, the normally-closed contact KA4 of control relay one KA of shunt opening coil F, control relay two KD of the normally-closed contact KA2 of control relay one KA, automatic shunt circuit breaker QF sequentially connect, and the series circuit L-M formed is in parallel with control relay two KD.
Access zero line N after casing FL connects with fuse FUK, control relay three FK; The normally-closed contact FK1 series connection access control relay secondary circuit of control relay three.
Phase shortage lacks zero automatic power-off protection device and also comprises fuse FUA, fuse FUB, fuse FUC, indicator light HA, indicator light HB, indicator light HC; Between fuse FUA, indicator light HA and normally-closed contact KD3 series connection access automatic shunt circuit breaker end of incoming cables A phase line and zero line; Between fuse HUB, indicator light HB and normally-closed contact KD4 series connection access automatic shunt circuit breaker end of incoming cables B phase line and zero line, between fuse FUC, indicator light HC and normally-closed contact KD5 series connection access automatic shunt circuit breaker end of incoming cables C phase line and zero line; Above-mentioned normally-closed contact is provided by control relay two in the present embodiment.
Phase shortage lacks zero automatic power-off protection device and also comprises fuse FUR, indicator light HR; Between fuse FUR, the indicator light HR series connection access any phase line of automatic shunt circuit breaker QF leading-out terminal and zero line N.In the present embodiment, be to be connected between C phase and zero line.
The present embodiment also comprises circuit breaker ZK1-ZK4; Circuit breaker ZK2 and ZK3 connect respectively between the parallel circuits two ends that form with series circuit X-Y at control relay one KA and two phase lines; Circuit breaker ZK1 and ZK4 connect respectively between the parallel circuits two ends that form with series circuit L-M at control relay two KD and a remaining phase line and zero line N.
This protective device has four kinds of possible operating states, is presented below respectively:
One, power when normal when power network line: close circuit breaker ZK1, ZK2, ZK3, ZK4, close fuse FUA, FUB, FUC, FUR, FUK, automatic shunt circuit breaker QF closes.
Power supply B phase → QF → ZK2 → KA → ZK3 → QF → power supply C phase, form the 380V circuit.Control relay KA energized action, its normally opened contact closure, normally-closed contact disconnects.
Power supply A phase → QF → ZK1 → KD → FK1 → ZK4 → QF → zero-power line N, form the 220V circuit.Control relay KD energized action, it often opens the closure of getting an electric shock, and normally closed electric shock disconnects.
During normal power supply, control relay KA, KD simultaneously electric, two loop X-Y of shunt opening coil F and L-M are all opened circuit, shunt circuit breaker QF is in the normally closed state automatically, normal operation.
Power supply C phase → FUR → HR → zero-power line N, indicator light HR is bright, means working properly.KD3, KD4, KD5 disconnect, and indicator light HA, HB, HC all extinguish, and mean without phase shortage.
Two, in running, when power supply lacks B phase or scarce C phase time, the control relay KA action of cut off the power supply, the normally opened contact disconnection, the normally-closed contact closure, loop X-Y opens circuit, loop L-M conducting.
Power supply A phase → QF → ZK1 → KA2 → F → KD2 → KA4 → ZK4 → QF → zero-power line N, form the 220V circuit.Circuit breaker Q F shunt opening coil F energized action, shunt circuit breaker QF tripping operation automatically, complete power-off protection.Simultaneously, indicator light HR outage is extinguished.KD3, KD4, KD5 closure, indicator light HA, HB, HC place in circuit, if the lamp mutually corresponding with A phase, B phase, C do not work, mean this phase phase shortage.
Three, in running, when power supply lacks A phase or scarce zero line N, the control relay KD action of cut off the power supply, the normally opened contact disconnection, the normally-closed contact closure, loop L-M opens circuit, loop X-Y conducting.
Power supply B phase → QF → ZK2 → KA1 → F → KD1 → KA3 → ZK3 → QF → power supply C phase, form the 380V circuit.Circuit breaker Q F shunt opening coil F energized action, shunt circuit breaker QF tripping operation automatically, complete power-off protection.Simultaneously, indicator light HR outage is extinguished.KD3, KD4, KD5 closure, clearing lamp HA, HB, HC place in circuit, if the lamp mutually corresponding with A phase, B phase, C do not work, mean this phase phase shortage.
Four,, in running, when control cabinet housing FL is charged, FL → FUK → FK → zero-power line N, form voltage circuit.Control relay FK action, normally-closed contact FK1 disconnects, and makes control relay KD outage, and its effect is equal to A phase or zero line N phase shortage.
Power supply B phase → QF → ZK2 → KA1 → F → KD1 → KA3 → ZK3 → QF → power supply C phase, form the 380V circuit.Circuit breaker Q F shunt opening coil F energized action, shunt circuit breaker QF tripping operation automatically, complete power-off protection.Simultaneously, indicator light HR outage, lamp extinguishes.KD3, KD4, KD5 closure, indicator light HA, HB, HC place in circuit, three indicator lights light simultaneously, mean that distribution box housing FL is charged.Embodiment 2
The line map that Fig. 2 is the embodiment of the present invention 2; Be with the difference of embodiment 1 two repel each other contact KD1 and KD2 evolutions that control relay two is provided.Its principle is similar to Example 1, and this is no longer going to repeat them.
Embodiment 3
The line map that Fig. 3 is the embodiment of the present invention 3; Be with the difference of embodiment 1 two repel each other contact KD1 and KD2 evolutions that control relay two is provided.Its principle is similar to Example 1, and this is no longer going to repeat them.
Embodiment 4
The line map that Fig. 4 is the embodiment of the present invention 4; Two mutual exclusion contact KD1 that are control relay two is provided with the difference of embodiment 1 and KD2 evolution.Its principle is similar to Example 1, and this is no longer going to repeat them.
Embodiment 5
The line map that Fig. 5 is the embodiment of the present invention 5; In the present embodiment, control relay one provides the contact of two mutual exclusions, i.e. normally opened contact KA1 and normally-closed contact KA2, and control relay two provides two normally-closed contact KD1 and KD3, two normally opened contact KD2 and KD4; KD1 is with in parallel with control relay one with KA1 and KD3 switching circuit X-Y in series again after shunt opening coil F connects; KD2 is with in parallel with control relay two with KA2 and KD4 switching circuit L-M in series again after shunt opening coil F connects; In addition, in the present embodiment, three of the phase shortage indicating circuit normally-closed contacts are provided by control relay one.Its principle is similar to Example 1, and this is no longer going to repeat them.
Embodiment 6
The line map that Fig. 6 is the embodiment of the present invention 6; Two mutual exclusion contact KA1 that are control relay one is provided with the difference of embodiment 5 and KA2 evolution.Its principle is similar to Example 1, and this is no longer going to repeat them.
Embodiment 7
The line map that Fig. 7 is the embodiment of the present invention 7; Two mutual exclusion contact KA1 that are control relay one is provided with the difference of embodiment 5 and KA2 evolution.Its principle is similar to Example 1, and this is no longer going to repeat them.
Embodiment 8
The line map that Fig. 8 is the embodiment of the present invention 8; Two mutual exclusion contact KA1 that are control relay one is provided with the difference of embodiment 5 and KA2 evolution.Its principle is similar to Example 1, and this is no longer going to repeat them.
Should be noted that, in the concrete enforcement of the present invention, can also make following change:
One, the normally-closed contact FK1 of control relay FK, can seal in control relay two KD loops, also can seal in control relay one KA loop, and action principle is identical;
Two, the normally-closed contact on pilot lamp loop, can by control relay KA, KD, any one provides separately, also can combine and provide, and also special relay can be set separately, depending on relay group number and cost control, need to determine;
Three, the compound mode that forms the switching circuit for controlling shunt opening coil F by the contact combination of control relay KA, KD can equity substitute, and also can increase equivalent redundancy in contact.
The present embodiment purpose is to make professional and technical personnel in the field to understand technical scheme of the present invention and to be implemented according to it; can not limit the scope of the invention with it; protection scope of the present invention is as the criterion with claims; allly according to the present invention, disclose any distortion and the retouching that technology is done, all fall into protection scope of the present invention.The content that protection scope of the present invention discloses with claims is as the criterion.
Claims (6)
1. a phase shortage lacks zero automatic power-off protection device, it is characterized in that: comprise automatic shunt circuit breaker, control relay one, control relay two; Automatically shunt circuit breaker accesses three-phase and four-line supply line, between any two phase lines of the control relay one automatic shunt circuit breaker leading-out terminal of access, between control relay two access phase lines of automatic shunt circuit breaker leading-out terminal residue and zero line; The grouping circuits that the shunt opening coil access control relay one of automatic shunt circuit breaker and the contact that control relay two provides form, to form two shunt opening coils of take automatic shunt circuit breaker be HW highway, the contact switch circuit in parallel with control relay one and control relay two respectively, be the shunt opening coil power supply;
The contact arrangement principle of described contact switch circuit is: one of them control relay provides two normally opened contacts and two normally-closed contacts, and another control relay provides a normally opened contact and a normally-closed contact; The both sides of two normally opened contact series connection access shunt opening coils of described last control relay, the normally-closed contact provided with another control relay forms the switching circuit in parallel with this control relay after connecting; The both sides of two normally-closed contact series connection access shunt opening coils of described last control relay, the normally opened contact provided with another control relay forms the switching circuit in parallel with another control relay after connecting;
When normal power supply, two contact switch circuits are off-state, and the shunt opening coil passes through without electricity; When power supply phase shortage occurs, lacks zero or housing when charged, wherein a contact switch circuit is by conducting, and the shunt opening coil obtains electric, automatically shunt circuit breaker tripping operation power-off protection.
2. a kind of phase shortage lacks zero automatic power-off protection device according to claim 1, it is characterized in that, also comprise control relay three, control relay three lacks zero automatic power-off protection device casing with an end after the fuse series connection and described phase shortage and is connected, and the other end is connected with zero line; The normally-closed contact of control relay three is connected with control relay one or control relay two.
3. lack zero automatic power-off protection device according to the described a kind of phase shortage of claim 1 or 2, it is characterized in that the concrete annexation of described contact switch circuit comprises following two kinds:
1) control relay one provides two normally opened contacts and two normally-closed contacts, and control relay two provides a normally opened contact and a normally-closed contact; Two normally opened contacts of control relay one are connected on shunt opening coil both sides, and the switching circuit that the normally-closed contact of the control relay two of connecting again in this series circuit forms is in parallel with control relay one; Two normally-closed contacts of control relay one are connected on shunt opening coil both sides, and the switching circuit that the normally opened contact of the control relay two of connecting again in this series circuit forms is in parallel with control relay two;
2) control relay two provides two normally opened contacts and two normally-closed contacts, and control relay one provides a normally opened contact and a normally-closed contact; Two normally opened contacts of control relay two are connected on shunt opening coil both sides, and the switching circuit that the normally-closed contact of the control relay one of connecting again in this series circuit forms is in parallel with control relay two; Two normally-closed contacts of control relay two are connected on shunt opening coil both sides, and the switching circuit that the normally opened contact of the control relay one of connecting again in this series circuit forms is in parallel with control relay one.
4. lack zero automatic power-off protection device according to claim 1 or the described a kind of phase shortage of 2 any one, it is characterized in that, also comprise three fuses and three phase shortage indicator lights; Automatically all connect between every of end of incoming cables of shunt circuit breaker phase line and zero line and access a fuse, an indicator light and a relay normally-closed contact; Described normally-closed contact any or relay of arranging in addition in control relay one, control relay two provide.
5. lack zero automatic power-off protection device according to claim 1 or the described a kind of phase shortage of 2 any one, it is characterized in that, automatically connect between any phase line of shunt circuit breaker leading-out terminal and zero line and access fuse and indicator light.
6. lack zero automatic power-off protection device according to claim 1 or the described a kind of phase shortage of 2 any one, it is characterized in that: also comprise four circuit breakers; Respectively connect after a circuit breaker and access again between described two phase lines in control relay one two ends; Respectively connect after a circuit breaker and access again between described phase line and zero line in control relay two two ends.
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| CN201310359500.XA CN103441466B (en) | 2013-08-16 | 2013-08-16 | A kind of Automatic phase-failure zero-failure power-off protection |
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| CN201310359500.XA CN103441466B (en) | 2013-08-16 | 2013-08-16 | A kind of Automatic phase-failure zero-failure power-off protection |
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| CN103441466B CN103441466B (en) | 2015-09-30 |
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Cited By (9)
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| CN103986119A (en) * | 2014-05-30 | 2014-08-13 | 国家电网公司 | Zero missing and zero breaking automatic protection device |
| CN105071340A (en) * | 2015-08-05 | 2015-11-18 | 山西太钢不锈钢股份有限公司 | Power phase failure protection apparatus |
| CN105186490A (en) * | 2015-08-17 | 2015-12-23 | 佛山电力设计院有限公司 | Circuit breaker with zero line and phase line breaking detection function and circuit breaker system with zero line and phase line breaking detection function |
| CN106356811A (en) * | 2016-10-27 | 2017-01-25 | 国网冀北电力有限公司张家口供电公司 | Circuit breaker with faulted neutral line and default phase protection function |
| CN106410741A (en) * | 2015-07-27 | 2017-02-15 | 山东变电工有限公司 | Self-power transmission device of universal circuit breaker |
| CN107732862A (en) * | 2017-10-20 | 2018-02-23 | 杨蔚星 | A kind of automatically controlled protection switch of three-phase and four-line all direction multifunctional accident |
| CN108448531A (en) * | 2018-05-02 | 2018-08-24 | 江苏省镇江船厂（集团）有限公司 | Landing stage three-phase four-wire system power distribution system secure protective device |
| CN110854804A (en) * | 2019-12-11 | 2020-02-28 | 重庆市同讯电力实业有限公司 | Power supply comprehensive protection device |
| CN117039861A (en) * | 2023-08-02 | 2023-11-10 | 南京港机重工制造有限公司 | Dual-cable-reel power supply control circuit and method |
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| CN103986119B (en) * | 2014-05-30 | 2017-06-20 | 国家电网公司 | Lack zero, automatic safety device off zero |
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| CN105071340A (en) * | 2015-08-05 | 2015-11-18 | 山西太钢不锈钢股份有限公司 | Power phase failure protection apparatus |
| CN105186490A (en) * | 2015-08-17 | 2015-12-23 | 佛山电力设计院有限公司 | Circuit breaker with zero line and phase line breaking detection function and circuit breaker system with zero line and phase line breaking detection function |
| CN106356811A (en) * | 2016-10-27 | 2017-01-25 | 国网冀北电力有限公司张家口供电公司 | Circuit breaker with faulted neutral line and default phase protection function |
| CN107732862A (en) * | 2017-10-20 | 2018-02-23 | 杨蔚星 | A kind of automatically controlled protection switch of three-phase and four-line all direction multifunctional accident |
| CN107732862B (en) * | 2017-10-20 | 2024-04-19 | 杨蔚星 | Three-phase four-wire omnibearing multifunctional accident electric control protection switch |
| CN108448531A (en) * | 2018-05-02 | 2018-08-24 | 江苏省镇江船厂（集团）有限公司 | Landing stage three-phase four-wire system power distribution system secure protective device |
| CN108448531B (en) * | 2018-05-02 | 2024-04-09 | 江苏省镇江船厂（集团）有限公司 | Safety protection device for pontoon three-phase four-wire system power distribution system |
| CN110854804A (en) * | 2019-12-11 | 2020-02-28 | 重庆市同讯电力实业有限公司 | Power supply comprehensive protection device |
| CN117039861A (en) * | 2023-08-02 | 2023-11-10 | 南京港机重工制造有限公司 | Dual-cable-reel power supply control circuit and method |
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