CN206727642U - A kind of phase shortage automatic power-off protection device - Google Patents
A kind of phase shortage automatic power-off protection device Download PDFInfo
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- CN206727642U CN206727642U CN201720255383.6U CN201720255383U CN206727642U CN 206727642 U CN206727642 U CN 206727642U CN 201720255383 U CN201720255383 U CN 201720255383U CN 206727642 U CN206727642 U CN 206727642U
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- 230000004224 protection Effects 0.000 title claims abstract description 36
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- 238000011084 recovery Methods 0.000 abstract description 2
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- 238000000819 phase cycle Methods 0.000 description 4
- 230000003068 static effect Effects 0.000 description 4
- 230000009471 action Effects 0.000 description 3
- 230000006378 damage Effects 0.000 description 3
- 230000005611 electricity Effects 0.000 description 3
- 230000001681 protective effect Effects 0.000 description 3
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- 238000005259 measurement Methods 0.000 description 2
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- 241000208340 Araliaceae Species 0.000 description 1
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- 235000008434 ginseng Nutrition 0.000 description 1
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Abstract
The utility model provides a kind of phase shortage automatic power-off protection device, some A.C. contactors of three phase electric machine current supply circuit and load are connected including controlling switch and respectively, the three phase electric machine current supply circuit end is provided with breaker, loss-of-phase relay protector is drawn between the A.C. contactor and the breaker, coil of the normally opened contact of the loss-of-phase relay protector respectively with the controlling switch and the A.C. contactor is connected, the controlling switch includes the control run switch being serially connected and control shutdown switch, the control run switch access three phase electric machine current supply circuit in parallel with the normally opened contact of the A.C. contactor.It is rapid to cut off supply line's problem when the utility model thoroughly solves abnormal electrical power supply, ensure the Electrical Safety of electrical equipment, and the automatic recovery of power supply after circuit recovers normal, ensure the safety of electrical equipment.
Description
Technical field
The utility model belongs to power-off protection technical field, and in particular to a kind of phase shortage automatic power-off protection device.
Background technology
Many electrical equipments, often because of overload power utilization, maintenance personal's carelessness, power supply unit failure, electric wire aging, natural calamity
The reasons such as evil, artificial destruction, cause voltage to raise suddenly, phase shortage/disconnected equal, be burned many electric equipments；Meanwhile because not having
The timely restorer work of method, larger economic loss is brought to national economy.In fact, these accidents only need to be in power supply
When occurring abnormal, power supply is disconnected, it is possible to avoid the damage of electric equipment.But because air switch, leakage switch do not have
There are these defencive functions, in abnormal electrical power supply, occur as soon as substantial amounts of electric equipment damage.
Main Producing reason is as follows：Serious overload power utilization causes electric current to increase, and causes three entered in unit line
A wherein short circuit in root live wire, so that zero fiery voltage between lines brings up to 380V from 220V moments, causes electrical equipment to be burnt；
When transforming circuit, because maintenance personal is careless, live wire is connected on zero line by mistake, and supply voltage is changing to two live wires simultaneously
380 volts, and ordinary appliances switch will not trip, therefore cause many electric equipments to be burned out；Utilities Electric Co. is in electric network reconstruction
Because needing (or careless) to exchange phase line, three-phase power-equipment is caused to invert or do not turn, so as to cause device damage；Three phase supply
In line facility, wherein a phase line loosens or cut by people, three phase electric machine is seted to overheat and burn from rotating；Transformer station sets
Standby to break down, the electrical equipment that voltage instability causes to be used is burned out；Construction mistiming blocks the zero line on transformer, causes
Single-phase voltage surges to 380 volts suddenly from 220 volts；Electric wire aging, zero line have been taken on live wire, substantial amounts of electrical equipment is burnt suddenly
It is bad；Strong wind blows down big tree, and big tree pounds electric wire, is burned line short；Wire short-circuiting, so that voltage instantaneous is brought up to
380 volts, electrical equipment is caused to be burnt；Distribution box is destroyed, and cable is stolen to be cut, and causes electrical equipment to be burnt out by moment；" zero line " loosen or
Stolen after being cut by people, result in that supply voltage is unbalance, and some phase voltages are relatively low, some phase voltage moment rises, and send a telegraph device
Equipment is burned out.
Utility model content
The purpose of this utility model is to provide a kind of phase shortage automatic power-off protection device, fast when thoroughly solving abnormal electrical power supply
Speed cut-out supply line problem, ensure the Electrical Safety of electrical equipment, and the automatic recovery of power supply after circuit recovers normal, ensure
The safety of electrical equipment.
The utility model provides following technical scheme：
A kind of phase shortage automatic power-off protection device, including controlling switch and connection three phase electric machine current supply circuit and load respectively
Some A.C. contactors, the three phase electric machine current supply circuit end is provided with breaker, the A.C. contactor and the breaker
Between draw loss-of-phase relay protector, the normally opened contact of the loss-of-phase relay protector respectively with the controlling switch and the friendship
The coil series connection of contactor is flowed, the controlling switch includes the control run switch being serially connected and control shutdown switch, described
Control the run switch access three phase electric machine current supply circuit in parallel with the normally opened contact of the A.C. contactor.
Preferably, the breaker is automatic shunt circuit breaker, and the automatic shunt circuit breaker is protected with the phase shortage relay
The normally-closed contact end series connection of device is protected, for making controlling switch separating brake at a distance, to control cutoff circuit.
Preferably, the A.C. contactor is three, connects the three-phase circuit of the three phase electric machine current supply circuit respectively, adopts
With three-phase three-wire system working method, the protection of three-phase three-wire system power supply unit can be preferably adapted to.
Preferably, the loss-of-phase relay protector uses three-phase three-wire system, is respectively connected to the breaker and is exchanged with described
On three-phase loop between contactor, even if disconnected realization and the indicating fault for mutually nor affecting on defencive function of any one phase.
Preferably, the open phase relay protector uses integrated circuit and voltage sampling, the loss-of-phase relay protector
Normally opened contact be connected on the A.C. contactor coil current supply circuit, voltage sampling mode and the work(by protection motor
Rate size is unrelated, adjusting and adjusting without any current class is carried out, can before motor starting, operating any mutually lack
The failures such as phase, misphase play a protective role.
The beneficial effects of the utility model are：Using three-phase three-wire system working method, three-phase three-wire system can be preferably adapted to
The protection of power supply unit；In-line power uses three phase supply, though the disconnected realization for mutually nor affecting on defencive function of any one phase and
Indicating fault；Using AC Data, three-phase voltage situation of change is detected in real time, measurement is more accurate, and fault verification is more reliable,
Disconnected phase (the disconnected phase of dynamic and the disconnected phase of static state) failure under energy any state of accurate judgement, while open phase fault and phase can be accurately distinguished
Sequence mistake failure；Overvoltage/undervoltage working value and actuation time can flexible modulation, actuation time is most fast up to 0.1 second, and line outage is not jumped
Lock, circuit telegram in reply do not trip, tripped immediately during circuit phase shortage.
Brief description of the drawings
Accompanying drawing is used for providing further understanding to of the present utility model, and a part for constitution instruction, with this practicality
New embodiment is used to explain the utility model together, does not form to limitation of the present utility model.In the accompanying drawings：
Fig. 1 is the utility model three-phase ac contactor wiring schematic diagram；
Fig. 2 is the utility model three-phase shunt opening breaker connection schematic diagram；
In figure mark for：SB1：Control run switch；SB2：Control shutdown switch；QF：Breaker；KM：A.C. contactor.
Embodiment
As depicted in figs. 1 and 2, a kind of phase shortage automatic power-off protection device, including controlling switch and three-phase electricity is connected respectively
Machine current supply circuit and some A.C. contactor KM of load, three phase electric machine current supply circuit end is provided with circuit breaker Q F, A.C. contactor
Draw loss-of-phase relay protector between KM and circuit breaker Q F, the normally opened contact of loss-of-phase relay protector respectively with controlling switch and friendship
Contactor KM coil series connection is flowed, controlling switch includes the control run switch SB1 being serially connected and control shutdown switch SB2,
Control run switch SB1 access three phase electric machine current supply circuits in parallel with A.C. contactor KM normally opened contact.Further, it is breaking
Device QF is automatic shunt circuit breaker, and automatic shunt circuit breaker is connected with the normally-closed contact end of loss-of-phase relay protector, for long distance
From controlling switch separating brake is made, to control cutoff circuit.
As shown in figure 1, A.C. contactor KM is three, the three-phase circuit of three phase electric machine current supply circuit is connected respectively, is used
Three-phase three-wire system working method, it can preferably adapt to the protection of three-phase three-wire system power supply unit.Loss-of-phase relay protector uses three
Three-phase three-wire system, it is respectively connected on the three-phase loop between circuit breaker Q F and A.C. contactor KM, it is disconnected mutually even if any one phase
Realization and the indicating fault of defencive function are not influenceed.The utility model integrally uses AC Data, detects three-phase electricity in real time
Situation of change is pressed, measurement is more accurate, and fault verification is more reliable, and (dynamic is disconnected mutually and quiet for the disconnected phase under energy any state of accurate judgement
State is broken phase) failure and open phase fault and phase sequence mistake failure can be accurately distinguished.
As shown in figure 1, open phase relay protector uses integrated circuit and voltage sampling, loss-of-phase relay protector it is normally opened
Contact series A.C. contactor KM coil current supply circuit, voltage sampling mode with by the watt level of protection motor without
Close, can be before motor starting, operating any phase phase shortage, misphase without adjusting and adjusting for any current class is carried out
Played a protective role etc. failure, in addition, can also be acted when three-phase voltage asymmetry degree is more than 13%, to play a protective role.
As depicted in figs. 1 and 2, after the utility model normal power-up, loss-of-phase relay protector obtain it is electric after be in adhesive shape
State, its normally opened contact end closure, normally-closed contact end disconnects.Now, run switch SB1 is controlled to start, A.C. contactor KM coils
Electric adhesive is obtained, A.C. contactor KM auxiliary normally opened contact closures carry out self-locking, and the normally opened main contacts closures of A.C. contactor KM make three
Phase motor obtains electric operation.When in circuit operation, because certain reason causes phase shortage, the utility model loss-of-phase relay protector is stood
Discharge, the normally opened contact of loss-of-phase relay protector will thus disconnected, so as to cut off the confession of A.C. contactor KM coils
Electricity and discharge, realize the function of power-off protection.
As depicted in figs. 1 and 2, the utility model can be protected as follows：(1) overvoltage protection and under-voltage protection：Overvoltage
Protection judgment basis is that ceiling voltage is more than over-pressed decision content in three-phase voltage, and under-voltage protection judgment basis is less than for minimum voltage
Under-voltage decision content, protector ' mistake/under-voltage ' indicator lamp flashes after overvoltage/undervoltage failure occurs, interior after the actuation time of delay setting
Portion's actuating of relay, ' mistake/under-voltage ' indicator lamp Chang Liang after protection act, the regulation of overvoltage/undervoltage action decision content be operating voltage with
Rated voltage Ue percentage, can from Ue ± (5%~20%) arbitrarily adjust, overvoltage/undervoltage action time delay can from 0.1S~
10S is arbitrarily adjusted, and regulative mode is embedded knob regulation, and overvoltage/undervoltage is adjusted simultaneously, simple to operate, overvoltage/undervoltage protection
Reset mode is to be automatically reset after voltage recovers normal, is provided with return difference value during reset, effectively prevents from malfunctioning；(2) three-phase voltage
Unbalance protection：Imbalance of three-phase voltage can load to electric machinery and cause three-phase current unbalance, motor feels hot increase, seriously
When burn machine winding, for transformer, can cause three-phase voltage uneven to Circuit Fault on Secondary Transformer when phase is broken in high-pressure side
Weigh failure, the utility model open-phase protection relay ' disconnected phase/imbalance ' instruction when non-equilibrium among three phase voltages are more than 10%
Lamp flashes, if protector internal relay action when imbalance fault is persistently present more than 5 seconds, after protection act ' disconnected phase/no
Balance ' indicator lamp Chang Liang, the reset mode of imbalance of three-phase voltage protection is degree of unbalancedness<8% automatically resets, and return difference value can have
Effect prevents from malfunctioning；(3) dynamic open-phase protection：Motor easily burns motor when disconnected phase occurs for three phase supply, particularly
Protection dynamically during disconnected phase is particularly important.The concept of the disconnected phase of dynamic is when threephase load is electric machinery inductive load, is being run
The failure situation of the disconnected phase of certain phase voltage occurs for period, now because back-emf caused by machine winding is applied to the loop of disconnected phase, leads
Cause the voltage of this primary Ioops to be not zero, caused by phenomenon of the failure be imbalance of three-phase voltage, this is also most open-phase protections
Device can not effectively protect the reason for dynamic open phase fault (because common open phase protector is without imbalance of three-phase voltage defencive function).And
A kind of open phase protector of the utility model has accurate, sensitive imbalance of three-phase voltage defencive function, when the disconnected phase of generation dynamic
During failure, protector ' disconnected phase/imbalance ' indicator lamp flicker, protector internal relay acts after postponing 5 seconds, ' disconnected phase/injustice
Weighing apparatus ' indicator lamp Chang Liang.The thus more targeted safety and reliability for strengthening circuit operation；(4) static disconnected mutually guarantor
Shield：The disconnected phenomenon of the failure for mutually referring to that certain phase voltage is zero in three-phase loop of static state.When static open phase fault occurs, protector prolongs
Internal relay acts after slow 1 second, ' disconnected phase/imbalance ' indicator lamp Chang Liang.Reset mode is power-off restoration；(5) phase sequence is wrong protects
Shield：It can cause motor reversal when having two-phase reversed in three-phase voltage loop, can cause operational outfit that severe safety occurs and try.
The actuation time of phase sequence error protection is 1 second, and ' phase sequence ' indicator lamp Chang Liang after protection act, reset mode is power-off restoration.
Preferred embodiment of the present utility model is the foregoing is only, is not limited to the utility model, although ginseng
The utility model is described in detail according to previous embodiment, for those skilled in the art, it still can be with
Technical scheme described in foregoing embodiments is modified, or equivalent substitution is carried out to which part technical characteristic.It is all
Within the spirit and principles of the utility model, any modification, equivalent substitution and improvements made etc., this practicality should be included in
Within new protection domain.
Claims (5)
1. a kind of phase shortage automatic power-off protection device, it is characterised in that including controlling switch and connect three phase electric machine respectively and power
Loop and some A.C. contactors of load, the three phase electric machine current supply circuit end are provided with breaker, the A.C. contactor and
Loss-of-phase relay protector is drawn between the breaker, the normally opened contact of the loss-of-phase relay protector is opened with the control respectively
Close and the coil of the A.C. contactor is connected, the controlling switch includes the control run switch being serially connected and control stops
Switch, the control run switch access three phase electric machine current supply circuit in parallel with the normally opened contact of the A.C. contactor.
2. a kind of phase shortage automatic power-off protection device according to claim 1, it is characterised in that the breaker is automatic
Shunt circuit breaker, the automatic shunt circuit breaker are connected with the normally-closed contact end of the loss-of-phase relay protector.
3. a kind of phase shortage automatic power-off protection device according to claim 1, it is characterised in that the A.C. contactor is
Three, the three-phase circuit of the three phase electric machine current supply circuit is connected respectively.
A kind of 4. phase shortage automatic power-off protection device according to claim 1, it is characterised in that the phase shortage relay protection
Device uses three-phase three-wire system, is respectively connected on the three-phase loop between the breaker and the A.C. contactor.
5. a kind of phase shortage automatic power-off protection device according to claim 1, it is characterised in that the open phase relay is protected
Shield device uses integrated circuit and voltage sampling, and the normally opened contact of the loss-of-phase relay protector is connected on the A.C. contactor
The current supply circuit of coil.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720255383.6U CN206727642U (en) | 2017-03-16 | 2017-03-16 | A kind of phase shortage automatic power-off protection device |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720255383.6U CN206727642U (en) | 2017-03-16 | 2017-03-16 | A kind of phase shortage automatic power-off protection device |
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| Publication Number | Publication Date |
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| CN206727642U true CN206727642U (en) | 2017-12-08 |
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| CN201720255383.6U Active CN206727642U (en) | 2017-03-16 | 2017-03-16 | A kind of phase shortage automatic power-off protection device |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108711830A (en) * | 2018-05-23 | 2018-10-26 | 云南华联锌铟股份有限公司 | A kind of HV motor protection device |
| CN110323733A (en) * | 2019-08-12 | 2019-10-11 | 合肥天鹅制冷科技有限公司 | A kind of three-phase alternating current arbitrarily connects adjust automatically protection circuit |
| CN110398639A (en) * | 2019-08-12 | 2019-11-01 | 合肥天鹅制冷科技有限公司 | A kind of three-phase alternating current adjust automatically detection circuit |
| CN111384711A (en) * | 2018-12-28 | 2020-07-07 | 江苏万帮德和新能源科技股份有限公司 | Phase-dislocation protection device based on charging pile system and use method thereof |
-
2017
- 2017-03-16 CN CN201720255383.6U patent/CN206727642U/en active Active
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108711830A (en) * | 2018-05-23 | 2018-10-26 | 云南华联锌铟股份有限公司 | A kind of HV motor protection device |
| CN108711830B (en) * | 2018-05-23 | 2023-12-29 | 云南华联锌铟股份有限公司 | High-voltage motor protection device |
| CN111384711A (en) * | 2018-12-28 | 2020-07-07 | 江苏万帮德和新能源科技股份有限公司 | Phase-dislocation protection device based on charging pile system and use method thereof |
| CN110323733A (en) * | 2019-08-12 | 2019-10-11 | 合肥天鹅制冷科技有限公司 | A kind of three-phase alternating current arbitrarily connects adjust automatically protection circuit |
| CN110398639A (en) * | 2019-08-12 | 2019-11-01 | 合肥天鹅制冷科技有限公司 | A kind of three-phase alternating current adjust automatically detection circuit |
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| GR01 | Patent grant | ||
| CP03 | Change of name, title or address |
Address after: No. 8, Huashan Road, Gaochun Economic Development Zone, Nanjing City, Jiangsu Province, 211300 Patentee after: Jiangsu Xunhui Technology Co.,Ltd. Address before: 210000 No. 8 Huashan Road, Gaochun Economic Development Zone, Nanjing City, Jiangsu Province Patentee before: NANJING SINCERE TECHNOLOGY DEVELOPMENT CO.,LTD. |
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| CP03 | Change of name, title or address | ||
| CP02 | Change in the address of a patent holder |
Address after: Building 1, No. 35 Xiushan Road, Economic Development Zone, Gaochun District, Nanjing City, Jiangsu Province, 211300 Patentee after: Jiangsu Xunhui Technology Co.,Ltd. Address before: No. 8, Huashan Road, Gaochun Economic Development Zone, Nanjing City, Jiangsu Province, 211300 Patentee before: Jiangsu Xunhui Technology Co.,Ltd. |
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| CP02 | Change in the address of a patent holder |