CN202503263U - Leakage protector having phase line switching function - Google Patents
Leakage protector having phase line switching function Download PDFInfo
- Publication number
- CN202503263U CN202503263U CN2012201259202U CN201220125920U CN202503263U CN 202503263 U CN202503263 U CN 202503263U CN 2012201259202 U CN2012201259202 U CN 2012201259202U CN 201220125920 U CN201220125920 U CN 201220125920U CN 202503263 U CN202503263 U CN 202503263U
- Authority
- CN
- China
- Prior art keywords
- circuit
- chip microcomputer
- current
- phase line
- phase
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
Images
Abstract
The utility model discloses a leakage protector having a phase line switching function. The leakage protector comprises a current mutual inductor and a three-phase current detecting circuit, wherein the current mutual inductor is used for detecting a leakage current and outputting a leakage signal, an output end of the current mutual inductor is connected with an amplification circuit, the leakage signal is amplified by the amplification circuit and then input to a single-chip microcomputer, the three-phase current detecting circuit is connected with a current signal receiving circuit, a current signal is input to the single-chip microcomputer by the three-phase signal receiving circuit, the current signal receiving circuit is used for receiving a three-phase current signal, an output end of the single-chip microcomputer is connected with a driving circuit, the driving circuit is in driving connection with switches in the three-phase line, the driving circuit is connected to an input end of the single-chip microcomputer through a feedback circuit, and a driving signal of the driving circuit is input to the single-chip microcomputer by the feedback circuit. The leakage protector having the phase line switching function can be switched automatically according to the loading conditions among the three phases, thus the current among the three phases is balanced, the damage caused by unbalanced currents among the three phases is reduced, thereby enabling the smooth operation of the grid, and improving the power supply quality.
Description
Technical field
The utility model relates to a kind of novel multifunctional earth leakage protective device.
Background technology
In low-voltage network, transmission line generally adopts three-phase four-wire system.In city dweller and rural power grids electric power system, use with because mostly electricity consumer is single-phase load or single-phase and three-phase load, and payload is different and electricity consumption time different, so must between the electrical network three-phase, must have unsymmetrical current.Unsymmetrical current can increase the electric energy loss of circuit and transformer, reduces exerting oneself of transformer, causes the imbalance of three-phase voltage easily.Earth leakage protective device on the market only has basic defencive function such as electric leakage, overcurrent, short circuit, over-and under-voltage.This type of earth leakage protective device can't switch carrying out intelligence between the phase line, causes when practical application, still existing above-mentioned problem.And existing earth leakage protective device all adopts electromagnetic relay, and this mechanical contact-type switch in use spark phenomenon can occur, and long-time the use or oxidation easily under adverse circumstances can cause the protection action can not stablize triggering.
The utility model content
Problem to above existence; The utility model provides a kind of novel multifunctional earth leakage protective device; This new type electric leakageproof device can not only be realized defencive functions such as basic electric leakage, overcurrent, short circuit, over-and under-voltage, can also carry out the switching between the phase line automatically according to existing each phase line loading condition, to a certain extent the electric current between the balance three-phase; Make the electrical network even running, improve power supply quality.
A kind of earth leakage protective device with the phase line handoff functionality; Comprise current transformer and three-phase current detection circuit, current transformer is used to detect leakage current and exports electric leakage signal, and the current transformer output connects amplifying circuit; Amplifying circuit is input to single-chip microcomputer after said electric leakage signal is amplified; Said current detection circuit connects the current signal receiving circuit, and the three-phase current signal receiving circuit is imported single-chip microcomputer with current signal, and the current signal receiving circuit is used to receive three-phase current signal; The output of single-chip microcomputer connects drive circuit; Driving circuit drives is connected the switch in the triple line, and drive circuit is connected to the input of single-chip microcomputer through feedback circuit, and feedback circuit is input to single-chip microcomputer with the drive signal of drive circuit.
Described switch adopts the bidirectional thyristor switch.
Said drive circuit comprises the triode that is connected with the single-chip microcomputer output, and triode connects light-operated bidirectional triode thyristor, and light-operated bidirectional triode thyristor connects the bidirectional thyristor switch.
Said bidirectional thyristor switch connects the protective circuit of being made up of resistance R 13, capacitor C 2, piezo-resistance R14.
Be connected with the puncture testing circuit on the said bidirectional thyristor switch, puncture the input that testing circuit is connected to single-chip microcomputer.
Said puncture testing circuit comprises filter capacitor, differential amplifier circuit and comparison output circuit.The pressure drop of bidirectional thyristor two ends is through diode D2, the D3 input of unidirectional conducting, then through being input to operational amplifier OP3, OP4 after resistance R 15, R16, R17, the R18 dividing potential drop.Operational amplifier OP3, OP4 form differential amplifier circuit, and the output of differential amplifier circuit is connected to comparator OP5 anode.Comparator OP5 negative terminal is connected with biasing resistor R24, R25, and comparator OP5 output connects light-emitting diode D1.
Said current signal receiving circuit receives the electric current of three-phase firewire, current value is input in the single-chip microcomputer, when the electric current of certain phase firewire surpasses set point; And the load of other phases is when light; Promptly satisfied the switching condition between the phase line, single-chip microcomputer output signal control drive circuit, the driving circuit drives switch breaks off this phase line; Single-chip microcomputer is exported signal control drive circuit more then, the phase line that drive circuit controlling and driving switch conduction need connect.
Said feedback circuit is input to single-chip microcomputer with the drive signal of drive circuit, single-chip microcomputer receive drive signal confirm phase line cut off after the conducting phase line that need connect again.
The utility model has following advantage with respect to prior art:
1. can switch automatically according to the loading condition between the three-phase.Come the electric current between the balance three-phase with this, reduced the harm that three alternate current imbalances are brought, make the electrical network even running, improve power supply quality.
2. adopt the bidirectional thyristor electronic switch to eliminate the spark phenomenon of mechanical contact switch.Since there is not mechanical part, can be in HI high impact, the work down of the environment of vibration.Electronic switch is highly sensitive simultaneously, and switching speed is fast, and required driving power is very little.
3. do not have coil owing in the electronic switch, thereby reduced electromagnetic interference.Under the three-phase handoff functionality, adopt electronic switch can reduce the volume of earth leakage protective device effectively, brought convenience to installation.
Description of drawings
Fig. 1 is the schematic block circuit diagram of the utility model.
Fig. 2 is the concrete composition of the utility model and connects sketch map.
Fig. 3 is the puncture testing circuit of the electronic switch of the utility model employing.
Embodiment
Below in conjunction with accompanying drawing the utility model is further described:
A kind of earth leakage protective device with the phase line handoff functionality, its schematic block circuit diagram is as shown in Figure 1, comprises zero sequence current mutual inductor 1; Amplifying circuit 2, single-chip microcomputer 3, drive circuit 4; Drive signal feedback circuit 5 punctures testing circuit 6, current signal receiving circuit 7 and three-phase current detection circuit 8.The input of earth leakage protective device is connected with zero line N with three live wires (L1, L2, L3) of three phase mains, and output then is according to loading condition selected automatically certain bar live wire and zero line N.The break-make of live wire L1 is by electronic switch K1 decision, in like manner live wire L2, last electronic switch K2, the K3 of being connected with respectively of L3.Protected three phase lines and zero line all pass ring-shaped core, constitute the primary winding of zero sequence current mutual inductor 1, when so no matter which bar phase line provides working power, all only need the detection that zero sequence current mutual inductor just can leak electricity.Current transformer 1 is used for detecting electric leakage and output electric leakage signal.Current transformer 1 output is connected to the input of amplifying circuit 2, and 2 pairs of said electric leakage signals of amplifying circuit carry out processing and amplifying, and this signal is offered single-chip microcomputer 3.Amplifying circuit 2 outputs are connected to the input of single-chip microcomputer 3.
Single-chip microcomputer 3 outputs connect 4, three electronic switches of drive circuit and under this control signal, carry out break-make.Will be to automaticallying switch between the phase line; Just must obtain the current information of three-phase firewire in advance; The current information of three-phase firewire detects through three-phase current detection circuit 8 earlier; Current signal receiving circuit 7 receives the three-phase current value separately that three-phase current detection circuit 8 detects then, then current value is offered single-chip microcomputer, and current signal receiving circuit 7 can also can receive through wireless mode through wired mode received current signal.The phase firewire load is overweight when making that electric current surpasses set point when certain; Single-chip microcomputer is at first exported corresponding low level signal to the phase line that needs break off, and promptly single-chip microcomputer is exported signal control drive circuit earlier, and the switch on this phase line of driving circuit drives breaks off this phase line; After guaranteeing that this phase line is broken off; Export the phase that the high level triggering needs conducting again, promptly single-chip microcomputer is exported signal control drive circuit again, the phase line that drive circuit controlling and driving switch conduction need connect.
Drive signal is input to single-chip microcomputer 3 through feedback circuit 5 again simultaneously;, phase line must guarantee the phase line that the conducting of original phase line cut-out ability earlier need connect when carrying out commutation; Feedback circuit 5 provides the drive signal of current each phase just for single-chip microcomputer 3, each phase drive signal of drive circuit 4 outputs is input to single-chip microcomputer 3 through feedback circuit 5, after single-chip microcomputer 3 receives drive signal; After confirming that the overweight phase line of load has been cut off, export the phase line that the control signal conducting need connect again.If close after adopting first conducting, will cause short circuit between the phase line, consequence is very serious.
Choosing a certain phase line like Fig. 2 is that example describes; Current transformer G monitors the electric leakage between conducting phase and zero line; If the electric leakage situation is arranged; Leakage current is input to single-chip microcomputer after amplifying through operational amplification circuit OP1 and OP2, thereby single-chip microcomputer just can detect leakage current circuit is carried out earth leakage protective.
The electric current that detects a certain phase when three-phase current detection circuit 8 surpasses set point; Be that this load of going up mutually is overweight; Need to break off earlier this switch of going up mutually this moment, connect other one switch gone up mutually again, be about to load and receive other one and get on mutually; Bidirectional thyristor K among Fig. 2 is made as the electronic switch that needs the conducting phase in the three-phase, adopts the electronic AC switch of bidirectional thyristor as the utility model here.Single-chip microcomputer receives after the current value of three-phase current detection circuit 8 detections; Judging needs phase inversion; Single-chip microcomputer corresponding I mouth output high level drives triode Q, and light-operated bidirectional triode thyristor MOC has the zero passage detection function, during triode Q saturation conduction; The also conducting thereupon of the light-emitting diode pipe end of light-operated bidirectional triode thyristor MOC, the secondary of light-operated bidirectional triode thyristor MOC detects back output triggering signal conducting bidirectional thyristor K bidirectional thyristor through voltage zero-cross.So just phase inversion has been carried out in electricity consumption, thereby load overweight forwarded to other one mutually and goes up mutually from original.
When current overload that this goes up mutually, need to turn-off certain phase power supply, according in like manner, single-chip microcomputer corresponding I mouth output low level, triode Q base stage loses trigger current, and triode ends.Light-operated bidirectional triode thyristor MOC also ends thereupon, thereby the bidirectional thyristor on this phase line turn-offs, and has cut off this phase power supply.
When the detected electric leakage signal of zero sequence current mutual inductor surpasses set point; Single-chip microcomputer will trigger interrupt routine automatically; So single-chip microcomputer corresponding I mouth output low level is by triode Q and light-operated bidirectional triode thyristor MOC; Bidirectional thyristor on three phase lines all will turn-off, and play the protective effect to electricity consumption.
Resistance R 13, capacitor C 2 composition RC buffer circuits and piezo-resistance R14 can both protect bidirectional thyristor.The adding of RC buffer circuit is the electric current and voltage climbing when suppressing the bidirectional thyristor switch
Parameters such as (du/dt and di/dt) is guaranteed the safety switch of bidirectional thyristor.When improving the devices switch track, the RC buffer circuit can be controlled EMI, also lowers electric current and voltage pressure, thereby reduces switching loss, maximally utilises the electronic switch characteristic, gives full play to the usefulness of electronic switch.
Meet with thunderbolt and connect, circuit usually can produce very high surge voltage when breaking off inductive load or bulk loads, surge voltage can cause damage to electronic switch.At this moment piezo-resistance R14 embodies his clamper characteristic, can carry out the clamper inhibition to lightning overvoltage and switching overvoltage, drags down too high voltage, lets late-class circuit be operated in the scope of a safety, thereby the bidirectional thyristor switch is played a protective role.
Because bidirectional thyristor has the conduction voltage drop of 1.5V approximately when conducting, so utilize the puncture testing circuit can the puncture situation of bidirectional thyristor be detected.Like Fig. 3; Diode D2, D3 have unidirectional conduction; The pressure drop of bidirectional thyristor two ends is through diode D2, the D3 input of unidirectional conducting, again through being input to computing circuit after divider resistance R15, R16 and R17, the conduction voltage drop dividing potential drop of R18 with bidirectional thyristor.Filter capacitor C2, C3 play the LPF effect, reduce the false triggering that occurs because of voltage instability.Two operational amplifier OP3, OP4 form differential amplifier circuit, and under normal circumstances the voltage of operational amplifier OP4 output is about 4V, and this voltage is input to the anode of comparator OP5 input.Bias potential through comparator OP5 and biasing resistor R24, R25 compares then, and comparator OP5 exports high level, and Light-Emitting Diode D1 does not work.When breakdown fault took place, the bidirectional thyristor two ends presented pass-through state, made that conduction voltage drop is zero.This moment, the output of operational amplifier OP4 relatively acted on through comparator OP5 near 0V again through behind the differential amplifier circuit, comparator OP5 output low level, and light-emitting diode D1 lights indication breakdown fault has taken place.
Claims (9)
1. earth leakage protective device with the phase line handoff functionality; It is characterized in that: comprise current transformer and three-phase current detection circuit, current transformer is used to detect leakage current and exports electric leakage signal, and the current transformer output connects amplifying circuit; Amplifying circuit is input to single-chip microcomputer after said electric leakage signal is amplified; Said current detection circuit connects the current signal receiving circuit, and the current signal receiving circuit is imported single-chip microcomputer with current signal, and the current signal receiving circuit is used to receive three-phase current signal; The output of single-chip microcomputer connects drive circuit; Driving circuit drives is connected the switch in the triple line, and drive circuit is connected to the input of single-chip microcomputer through feedback circuit, and feedback circuit is input to single-chip microcomputer with the drive signal of drive circuit.
2. a kind of earth leakage protective device with the phase line handoff functionality according to claim 1 is characterized in that: described switch adopts the bidirectional thyristor switch.
3. a kind of earth leakage protective device according to claim 2 with the phase line handoff functionality; It is characterized in that: said drive circuit comprises the triode Q that is connected with the single-chip microcomputer output; Triode Q connects light-operated bidirectional triode thyristor, and light-operated bidirectional triode thyristor connects the bidirectional thyristor switch.
4. a kind of earth leakage protective device with the phase line handoff functionality according to claim 3 is characterized in that: said bidirectional thyristor switch connects the buffer protection circuit of being made up of resistance R 13, capacitor C 2.
5. a kind of earth leakage protective device with the phase line handoff functionality according to claim 4 is characterized in that: be connected with piezo-resistance R14 on the said bidirectional thyristor switch.
6. a kind of earth leakage protective device with the phase line handoff functionality according to claim 5 is characterized in that: be connected with the puncture testing circuit on the said bidirectional thyristor switch, puncture the input that testing circuit is connected to single-chip microcomputer.
7. a kind of earth leakage protective device according to claim 6 with the phase line handoff functionality; It is characterized in that: said puncture testing circuit comprises conducting unilateral diode D2, the D3 that is connected on the bidirectional thyristor switch; Diode D2, D3 are connected to operational amplifier OP3, OP4 after through divider resistance R15, R16, R17, R18; Operational amplifier OP3, OP4 form differential amplifier circuit; The output of operational amplifier OP4 connects comparator OP5 anode, is connected with biasing resistor R24, R25 on the comparator OP5 negative terminal, and comparator OP5 output connects light-emitting diode D1.
8. a kind of earth leakage protective device according to claim 7 with the phase line handoff functionality; It is characterized in that: said current signal receiving circuit receives the electric current of three-phase firewire, current value is input in the single-chip microcomputer, when the electric current of certain phase firewire surpasses set point; Single-chip microcomputer output signal control drive circuit; The driving circuit drives switch breaks off this phase line, and single-chip microcomputer is exported signal control drive circuit more then, the phase line that drive circuit controlling and driving switch conduction need connect.
9. a kind of earth leakage protective device according to claim 8 with the phase line handoff functionality; It is characterized in that: said feedback circuit is input to single-chip microcomputer with the drive signal of drive circuit, single-chip microcomputer receive drive signal confirm phase line cut off after the conducting phase line that need connect again.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012201259202U CN202503263U (en) | 2012-03-29 | 2012-03-29 | Leakage protector having phase line switching function |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012201259202U CN202503263U (en) | 2012-03-29 | 2012-03-29 | Leakage protector having phase line switching function |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202503263U true CN202503263U (en) | 2012-10-24 |
Family
ID=47039863
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2012201259202U Expired - Fee Related CN202503263U (en) | 2012-03-29 | 2012-03-29 | Leakage protector having phase line switching function |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202503263U (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102623947A (en) * | 2012-03-29 | 2012-08-01 | 临安亿安电力电子科技有限公司 | Leakage protector with phase line switching function |
| CN104253417A (en) * | 2013-06-28 | 2014-12-31 | 海尔集团公司 | Zero-crossing signal generation and synchronous communication circuit and method, and household appliance |
| CN117134295A (en) * | 2023-07-10 | 2023-11-28 | 中国矿业大学 | Solid-state switch system of underground motor and emergency stop protection control method thereof |
| CN117134295B (en) * | 2023-07-10 | 2024-04-16 | 中国矿业大学 | Solid-state switch system of underground motor and emergency stop protection control method thereof |
-
2012
- 2012-03-29 CN CN2012201259202U patent/CN202503263U/en not_active Expired - Fee Related
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102623947A (en) * | 2012-03-29 | 2012-08-01 | 临安亿安电力电子科技有限公司 | Leakage protector with phase line switching function |
| CN102623947B (en) * | 2012-03-29 | 2015-09-23 | 临安亿安电力电子科技有限公司 | A kind of earth leakage protective device with phase line handoff functionality |
| CN104253417A (en) * | 2013-06-28 | 2014-12-31 | 海尔集团公司 | Zero-crossing signal generation and synchronous communication circuit and method, and household appliance |
| CN104253417B (en) * | 2013-06-28 | 2018-03-23 | 海尔集团公司 | Zero cross signal produces and synchronous communication circuit, method and home appliance |
| CN117134295A (en) * | 2023-07-10 | 2023-11-28 | 中国矿业大学 | Solid-state switch system of underground motor and emergency stop protection control method thereof |
| CN117134295B (en) * | 2023-07-10 | 2024-04-16 | 中国矿业大学 | Solid-state switch system of underground motor and emergency stop protection control method thereof |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN102623947B (en) | A kind of earth leakage protective device with phase line handoff functionality | |
| CN204967236U (en) | Leakage protector | |
| CN104810793B (en) | A kind of transformer neutral point direct current blocking device | |
| CN101976815B (en) | Loaded multifunctional protection circuit | |
| CN203983950U (en) | Broken neutral line automatic safety device | |
| CN202503263U (en) | Leakage protector having phase line switching function | |
| CN201536254U (en) | Protector for power transformer | |
| CN204597457U (en) | Transformer neutral point direct current is every straight device | |
| CN106451500B (en) | Interphase load transfer terminal device based on transient waveform fitting | |
| CN104377647A (en) | Electric leakage protection circuit | |
| CN204205560U (en) | leakage protection circuit | |
| CN209184242U (en) | It is a kind of to dispatch controllable power network neutral point earthing or grounding means | |
| CN208352961U (en) | A kind of comprehensive protective circuit breaker | |
| CN106972462B (en) | Low-voltage distribution cabinet neutral line breakage protection device | |
| CN206517035U (en) | Low-voltage distribution cabinet broken neutral line protection device | |
| CN203166469U (en) | Phase sequence protective relay | |
| CN204992525U (en) | Undervoltage protection circuit of delaying of switch electrical apparatus | |
| CN205092766U (en) | Charging system in advance suitable for super large power high voltage transformers | |
| CN209461383U (en) | Relay drive circuit, relay | |
| CN206135392U (en) | Disconnected zero -sum in area lacks looks protect function's circuit breaker | |
| CN104418194A (en) | Elevator control cabinet | |
| CN202455056U (en) | Current limiting device for inhibiting short-circuit faults of power system | |
| CN203368013U (en) | Protection device for residual voltage of bus | |
| CN201904601U (en) | Multifunctional three-phase circuit breaker | |
| CN201985508U (en) | Zero line break protector and connecting structure thereof |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| ASS | Succession or assignment of patent right |
Owner name: ZHEJIANG SCI-TECH UNIVERSITY Effective date: 20131031 |
|
| C41 | Transfer of patent application or patent right or utility model | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20131031 Address after: Hangzhou City, Zhejiang province Ling'an City Road 311300, Jincheng Street No. 2 Patentee after: Lin'an Yian Electric Power Electronic Science & Technology Co., Ltd. Patentee after: Zhejiang Sci-Tech University Address before: Hangzhou City, Zhejiang province Ling'an City Road 311300, Jincheng Street No. 2 Patentee before: Lin'an Yian Electric Power Electronic Science & Technology Co., Ltd. |
|
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20121024 Termination date: 20210329 |