CN203387153U - Automatic power-off protection device for phase loss and zero-line deficiency - Google Patents
Automatic power-off protection device for phase loss and zero-line deficiency Download PDFInfo
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- CN203387153U CN203387153U CN201320502902.6U CN201320502902U CN203387153U CN 203387153 U CN203387153 U CN 203387153U CN 201320502902 U CN201320502902 U CN 201320502902U CN 203387153 U CN203387153 U CN 203387153U
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Abstract
The utility model provides an automatic power-off protection device for phase loss and zero-line deficiency, and the device comprises an automatic shunt circuit breaker and a plurality of control relays. Two switching circuits which are formed by the combination of the contacts of two control relays are employed to supply two power supply loops for a shunt coil. When there are no phase loss and no zero-line deficiency, the two switching circuits are both off, and there is no current across the shunt coil, and power supply is normal. When there are phase loss and zero-line deficiency, one of the two switching circuits is on, and there is current across the shunt coil, and the automatic shunt circuit breaker trips for power-off protection. When the housing of a distribution box is charged, there is electricity on the control relay 3, and the normally-closed contact of the control relay 3 is off, thereby enabling the loop where the normally-closed contact lies to be disconnected. The effect of the operation is equivalent to a situation of the phase loss and zero-line deficiency, and the shunt coil obtains electricity, and the automatic shunt circuit breaker trips for power-off protection. The protection device provided by the utility model is simple in structure, small in number of used parts, high in reliability, low in cost, and the like.
Description
Technical field
The utility model relates to a kind of circuit protection device, and 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.
The utility model content
In order to make up the deficiencies in the prior art; the technical problems to be solved in the utility model 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 above-mentioned utility model purpose, the utility model 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 utility model 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 described in the utility model 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 utility model 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 utility model and zero line, connect access fuse and indicator light.
Further, the utility model 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 utility model, 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; the beneficial effects of the utility model are 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, have 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 utility model embodiment 1;
The line map that Fig. 2 is the utility model embodiment 2;
The line map that Fig. 3 is the utility model embodiment 3;
The line map that Fig. 4 is the utility model embodiment 4;
The line map that Fig. 5 is the utility model embodiment 5;
The line map that Fig. 6 is the utility model embodiment 6;
The line map that Fig. 7 is the utility model embodiment 7;
The line map that Fig. 8 is the utility model embodiment 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 utility model is further described.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 utility model.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 utility model embodiment 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 utility model embodiment 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 utility model embodiment 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 utility model embodiment 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 utility model embodiment 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 utility model embodiment 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 utility model embodiment 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 utility model, 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 the technical solution of the utility model and to be implemented according to it; can not limit protection range of the present utility model with it; protection range of the present utility model is as the criterion with claims; all any distortion and retouchings of doing according to the utility model disclosure technology, all fall into protection range of the present utility model.The content that protection range of the present utility model 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.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320502902.6U CN203387153U (en) | 2013-08-16 | 2013-08-16 | Automatic power-off protection device for phase loss and zero-line deficiency |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320502902.6U CN203387153U (en) | 2013-08-16 | 2013-08-16 | Automatic power-off protection device for phase loss and zero-line deficiency |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203387153U true CN203387153U (en) | 2014-01-08 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201320502902.6U Withdrawn - After Issue CN203387153U (en) | 2013-08-16 | 2013-08-16 | Automatic power-off protection device for phase loss and zero-line deficiency |
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| Country | Link |
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| CN (1) | CN203387153U (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103441466A (en) * | 2013-08-16 | 2013-12-11 | 湛江开关有限公司 | Automatic phase-failure zero-failure power-off protection device |
| CN103825260A (en) * | 2014-02-28 | 2014-05-28 | 北京欧地安科技股份有限公司 | Power supply surge protective 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 |
| CN112615349A (en) * | 2020-12-08 | 2021-04-06 | 国网四川省电力公司攀枝花供电公司 | Low-voltage power distribution cabinet phase-loss protection device |
-
2013
- 2013-08-16 CN CN201320502902.6U patent/CN203387153U/en not_active Withdrawn - After Issue
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103441466A (en) * | 2013-08-16 | 2013-12-11 | 湛江开关有限公司 | Automatic phase-failure zero-failure power-off protection device |
| CN103441466B (en) * | 2013-08-16 | 2015-09-30 | 湛江开关有限公司 | A kind of Automatic phase-failure zero-failure power-off protection |
| CN103825260A (en) * | 2014-02-28 | 2014-05-28 | 北京欧地安科技股份有限公司 | Power supply surge protective device |
| CN103825260B (en) * | 2014-02-28 | 2018-04-27 | 北京欧地安科技有限公司 | Power source surge protector |
| 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 |
| CN105071340B (en) * | 2015-08-05 | 2017-12-01 | 山西太钢不锈钢股份有限公司 | A kind of protection device of power phase shortage |
| CN112615349A (en) * | 2020-12-08 | 2021-04-06 | 国网四川省电力公司攀枝花供电公司 | Low-voltage power distribution cabinet phase-loss protection device |
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