CN2874882Y - Complex protective switch for lost phase, overcurrent and leakage - Google Patents
Complex protective switch for lost phase, overcurrent and leakage Download PDFInfo
- Publication number
- CN2874882Y CN2874882Y CN 200620023315 CN200620023315U CN2874882Y CN 2874882 Y CN2874882 Y CN 2874882Y CN 200620023315 CN200620023315 CN 200620023315 CN 200620023315 U CN200620023315 U CN 200620023315U CN 2874882 Y CN2874882 Y CN 2874882Y
- Authority
- CN
- China
- Prior art keywords
- phase
- circuit
- diode
- current
- resistance
- 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
Landscapes
- Emergency Protection Circuit Devices (AREA)
Abstract
A comprehensive protective switch for phase-lacking, over-current and electric leakage is disclosed, and belongs to the technical field of circuit protective device. The protective switch is composed of an air circuit breaker, an electric leakage protective circuit, a phase-lacking/over-current protective circuit, a zero sequence current transformer, a three-phase current transformer, and an electric leakage release. The zero sequence current transformer is connected with the electric leakage protective circuit. The three-phase current transformer is connected with the phase-lacking/over-current protective circuit. The electric leakage protective circuit is connected with the phase-lacking/over-current protective circuit in parallel, and has two output ends after parallel connection. One output end is series-connected with coil of the electric leakage release and further connected with phase A of three-phase power supply, and the other output end is connected with phase C of three-phase power supply. The inventive protective switch has the advantages of comprehensive function, low cost, precise judgment, and reliable action.
Description
Technical field
The utility model relates to a kind of switch to faults such as circuit phase shortage, overcurrent, electric leakage enforcement protection, belongs to the circuit protection device technical field.
Background technology
Motor is the major impetus source of industrial and agricultural production, and is very extensive in the application of China's all trades and professions.Particularly capacity accounts for more than 95% of motor application share again at the miniature motor below the 18.5KW (such as blower motor, pump motor, machine motor and various agricultural motor, immersible pump etc.).For miniature motor; mostly still, be in no any protection facility at present or only use Control work under an air switch, A.C. contactor or the thermal relay protective condition; particularly in the rural area; the user who has is only with a job of plug-in strip control motor; therefore for electric faults such as the short circuit that produces, overload, the phases failure, effective protection can not be provided and cause burn-down of electric motor.And it is existing in China at overcurrent; electric faults such as the phase failure are protected in the designed product; judge inaccurate when existing circuit phase failure phase shortage respectively; operate time is longer behind the overcurrent; and the shortcoming of function singleness; for example its phase discriminant circuit of Chinese patent ZL02295388.4 disclosed " Lost Phase Zero-Leakage Protective Device " exists and judges inaccurate this technical problem; and the overcurrent protection of most of circuit breakers is to adopt the thermal relay or the mode of bimetal leaf; it is higher to exist cost; cross flow valuve and judge shortcoming inaccurate and that operate time is long; therefore design a kind of can be to phase shortage; overcurrent; faults such as electric leakage are implemented the protection switch of protection, are bound to be subjected to users' welcome.
Summary of the invention
Technical problem to be solved in the utility model provides a kind of complete function, with low cost, accuracy of judgement, the motor phase shortage of reliable in action, overcurrent, electric leakage protection switch.
The technical scheme that solves the problems of the technologies described above is:
A kind of phase shortage; overcurrent; the electric leakage protection switch; it is by air circuit; leakage protection circuit; phase shortage; current foldback circuit; zero sequence current mutual inductor; threephase current transformer; leakage tripping device is formed; its improvements are; zero sequence current mutual inductor is connected with leakage protection circuit; threephase current transformer and phase shortage; current foldback circuit is connected; leakage protection circuit and phase shortage; current foldback circuit is in parallel; two outputs are arranged after the parallel connection; be connected with the A of three phase mains behind the coil tandem of one end and leakage tripping device, the other end is connected with the C of three phase mains.
Above-mentioned phase shortage, overcurrent, electric leakage protection switch, described phase shortage, current foldback circuit are formed signal input circuit, default phase signal sample circuit, over-current signal sample circuit, signal output apparatus by diode D1-D10, controllable silicon CR03, electrochemical capacitor C1-C4, resistance R 1-R9, potentiometer RD1, voltage-stabiliser tube DW1;
In the described signal input circuit, diode D1 oppositely is connected on the lead-in wire terminal of the A phase mutual inductor of threephase current transformer, diode D2, D3 output after the forward A, B phase mutual inductor that are connected on threephase current transformer connects respectively and the output after B, C phase mutual inductor are connected, the negative pole of diode D2, D3 is connected in parallel the back by electrochemical capacitor C1 ground connection, the lead-in wire terminal of A phase mutual inductor ground connection after the mutual inductance finish lead connects mutually with C by electrochemical capacitor C2;
In the described default phase signal sample circuit, resistance R 1, R2 are connected on behind the positive and negative electrode of diode D1, D2 in parallel respectively, and sys node connects the positive pole of diode D4 by resistance R 3;
In the described over-current signal sample circuit, be connected between the negative pole sys node and ground of diode D2, D3 after resistance R 4, potentiometer RD1, resistance R 5 series connection, the mid point of potentiometer RD1 is connected in proper order with diode D10, resistance R 8, voltage-stabiliser tube DW1, diode D5 and is connected, according to said sequence diode D10, D5 is that forward connects, and voltage-stabiliser tube DW1 oppositely connects;
In the described signal output apparatus; the control utmost point with controllable silicon CR03 after the negative pole parallel connection of above-mentioned diode D4, D5 joins; diode D6-D9 forms bridge switch; its positive pole connects the positive pole of controllable silicon CR03; ground connection after the negative pole of its negative pole and controllable silicon CR03 joins, the outlet of the ground of phase shortage, current foldback circuit and threephase current transformer C phase coil is joined.
Above-mentioned phase shortage, overcurrent, electric leakage protection switch; described leakage protection circuit is made up of earth leakage protective device special circuit integrated chip and peripheral circuit; the bridge switch that its output is formed for diode D14-D17; its two mid points are in parallel with two mid points that the diode D6-D9 of above-mentioned phase shortage, current foldback circuit forms bridge switch respectively, and parallel conducting wire is connected with power supply A, C respectively.
Above-mentioned phase shortage, overcurrent, electric leakage protection switch; its leakage tripping device L is connected on after above-mentioned two bridge switch parallel connections and A mutually in the connection lead of power supply; it also has piezo-resistance MOV1 and anti-interference capacitor C 18, and they are connected between two output leads that are connected with power supply A, C respectively after above-mentioned two bridge switch parallel connections.
The utility model combines the resist technology for faults such as phase shortage, overcurrent, electric leakages of the prior art; the prior art that compares; have complete function, with low cost, accuracy of judgement; characteristics such as highly sensitive, reliable in action, antijamming capability are strong; therefore improved protection dramatically, had good development prospect motor.
Description of drawings
Fig. 1 is the utility model circuit block diagram;
Fig. 2 is the utility model circuit theory diagrams.
Mark is as follows among the figure: 1, leakage protection circuit 2, phase shortage, current foldback circuit 3, zero sequence current mutual inductor 4, threephase current transformer 5, leakage tripping device 6, signal input circuit 7, default phase signal sample circuit 8, over-current signal sample circuit 9, signal output apparatus
Embodiment
Below with reference to the Figure of description explanation detailed in addition to embodiment of the present utility model.
Fig. 1 is the utility model circuit block diagram; as seen from Figure 1; the utility model is a kind of phase shortage, overcurrent, electric leakage protection switch, and its structure is made up of zero sequence current mutual inductor 3, threephase current transformer 4, leakage tripping device 5, leakage protection circuit 1, phase shortage, current foldback circuit 2.Wherein leakage protection circuit 1 is made up of earth leakage protective device special circuit integrated chip and peripheral circuit, and phase shortage, current foldback circuit 2 are made up of signal input circuit 6, default phase signal sample circuit 7, over-current signal sample circuit 8, signal output apparatus 9.It also has test button K1, test resistance RS, piezo-resistance MOV1 and anti-interference capacitor C 18 in addition.
Fig. 2 is the utility model circuit theory diagrams; as we can see from the figure; zero sequence current mutual inductor 3 is represented by zero sequence current mutual inductor FH; it is connected with leakage protection circuit 1; threephase current transformer 4 is by current transformer AH; BH; CH represents; it and phase shortage; current foldback circuit 2 is connected; leakage protection circuit 1 and phase shortage; current foldback circuit 2 connects together by circuit; and two outputs are arranged after connecing; be connected with the A of three phase mains behind the coil tandem of output and leakage tripping device L; another output termination is connected with the C of three phase mains; piezo-resistance MOV1 and anti-interference capacitor C 18 also meet A with three phase mains; between the C phase, test button K1; test resistance RS is serially connected and passes behind the zero sequence current mutual inductor FH A with three phase mains; C is connected.
Below the circuit connecting mode of phase shortage, current foldback circuit 2 is elaborated.Phase shortage, current foldback circuit 2 are made up of diode D1-D10, controllable silicon CR03, electrochemical capacitor C1-C4, resistance R 1-R9, potentiometer RD1, voltage-stabiliser tube DW1.The lambda line of the AH coil of the negative pole of diode D1 and current transformer joins; anodal and resistance R 1 is joined; the lambda line of the BH coil of the outlet summation current transformer of the AH coil of the positive pole of diode D2 and current transformer joins; negative pole and resistance R 2; join with the positive pole of diode D4 again after the R3 serial connection; the lambda line of the CH coil of the outlet summation current transformer of the BH coil of the positive pole of diode D3 and current transformer joins; the positive pole of electrochemical capacitor C1 and diode D2; the negative pole of D3 also connects; its minus earth; the positive pole of the negative pole of electrochemical capacitor C2 and diode D1 also connects; its plus earth; the negative pole of resistance R 4 one ends and diode D2 also connects; the other end and potentiometer RD1; R5 serial connection back ground connection; the mid point of the positive pole of diode D10 and potentiometer RD1 joins; negative pole and resistance R 8; connect positive pole after the voltage-stabiliser tube DW1 serial connection with diode D5; resistance R 1 with resistance R 2 and connect be connected in series with resistance R 6 again the back ground connection; the negative pole of resistance R 7 one ends and diode D10 also connects; other end ground connection; the positive pole of electrochemical capacitor C3 is attempted by between resistance R 8 and the voltage-stabiliser tube DW1; its minus earth; diode D4; the negative pole of D5 also connects the back and joins with the control utmost point of controllable silicon CR03; resistance R 9 is attempted by between the control utmost point and ground of controllable silicon CR03; the anodal control utmost point with controllable silicon CR03 of electrochemical capacitor C4 joins; its minus earth; diode D6-D9 forms bridge switch; its positive pole connects the positive pole of controllable silicon CR03; ground connection after the negative pole of its negative pole and controllable silicon CR03 joins, phase shortage; the outlet of the ground of current foldback circuit 2 and current transformer CH coil is joined.
Can see that in Fig. 2 leakage protection circuit 1 is is the typical application circuit of core with VG54123 earth leakage protective device special circuit integrated chip, its mode is existing open and set forth no longer statement here in every electric leakage product technology.
The course of work of the present utility model is as follows: when the open-phase fault of a phase or two-phase takes place in the circuit; just produce corresponding default phase signal among current transformer AH, BH, the CH; default phase signal sample circuit 7 by resistance R 1, R2, R3, diode D4 composition; the control utmost point at controllable silicon CR03 produces a high potential; make controllable silicon CR03 conducting; while is by the just conducting of the bridge switch of forming of diode D6-D9; make leakage tripping device L action; cut off the air circuit linked switch, thereby reach the purpose of protection.
In when, in the circuit overcurrent or short trouble taking place when; just produce corresponding over-current signal among current transformer AH, BH, the CH; over-current signal sample circuit 8 by resistance R 4, R5, R6, R7, R8, potentiometer RD1, voltage stabilizing didoe DW1, diode D5 composition; the control utmost point at controllable silicon CR03 produces a high potential; make controllable silicon CR03 conducting; the just conducting of forming by diode D6-DD9 of bridge switch simultaneously; make leakage tripping device L action, thereby cut off the purpose that the air circuit linked switch reaches protection.
In when, in the circuit electric leakage taking place when; just produce corresponding electric leakage signal among the zero sequence current mutual inductor FH; when this signal reaches the specified action value; electric leakage signal is just by being that the amplification of typical application circuit of core and processing make the just conducting of the bridge switch of forming by diode D14-D17 by VG54123 earth leakage protective device special circuit integrated chip; make leakage tripping device L action; cut off the air circuit linked switch, thereby reach the purpose of protection.
Piezo-resistance MOV1 is connected between A, the C phase of three phase mains, plays the overvoltage protection effect, and anti-interference capacitor C 18 is connected between A, the C phase of three phase mains, plays anti-interference effect.
Test button K1, test resistance RS be serially connected and pass zero sequence current mutual inductor FH after be connected with A, the C of three phase mains, use as the electric leakage analogue test.
Foregoing description only proposes as a kind of enforceable technical scheme of the utility model phase shortage, overcurrent, electric leakage protection switch, not as the single restrictive condition to its structure.
Claims (4)
1; a kind of phase shortage; overcurrent; the electric leakage protection switch; it is by air circuit; leakage protection circuit 1 ; phase shortage; current foldback circuit 2 ; zero sequence current mutual inductor 3 ; threephase current transformer 4 ; leakage tripping device 5 form; it is characterized in that: zero sequence current mutual inductor 3 are connected with leakage protection circuit 1 ; threephase current transformer 4 and phase shortage; current foldback circuit 2 are connected; leakage protection circuit 1 and phase shortage; current foldback circuit 2 are in parallel; two outputs are arranged after the parallel connection; be connected with the A of three phase mains behind the coil tandem of one end and leakage tripping device 5 , another termination is connected with the C of three phase mains.
2, phase shortage according to claim 1, overcurrent, electric leakage protection switch is characterized in that: described phase shortage, current foldback circuit 2 form signal input circuit 6 , default phase signal sample circuit 7 , over-current signal sample circuit 8 , signal output apparatus 9 by diode D1-D10, controllable silicon CR03, electrochemical capacitor C1-C4, resistance R 1-R9, potentiometer RD1, voltage-stabiliser tube DW1;
Among described signal input circuit 6 , diode D1 oppositely is connected on the lead-in wire terminal of the A phase mutual inductor of threephase current transformer 4 , diode D2, D3 output after the forward A, B phase mutual inductor that are connected on threephase current transformer 4 connects respectively and the output after B, C phase mutual inductor are connected, the negative pole of diode D2, D3 is connected in parallel the back by electrochemical capacitor C1 ground connection, the lead-in wire terminal of the A phase mutual inductor of threephase current transformer 4 ground connection after the mutual inductance finish lead connects mutually with C by electrochemical capacitor C2;
Among described default phase signal sample circuit 7 , resistance R 1, R2 are connected on behind the positive and negative electrode of diode D1, D2 in parallel respectively, and sys node connects the positive pole of diode D4 by resistance R 3;
Among described over-current signal sample circuit 8 , be connected between the negative pole sys node and ground of diode D2, D3 after resistance R 4, potentiometer RD1, resistance R 5 series connection, the mid point of potentiometer RD1 is connected in proper order with diode D10, resistance R 8, voltage-stabiliser tube DW1, diode D5 and is connected, according to said sequence diode D10, D5 is that forward connects, and voltage-stabiliser tube DW1 oppositely connects;
Among described signal output apparatus 9 ; the control utmost point with controllable silicon CR03 after the negative pole parallel connection of above-mentioned diode D4, D5 joins; diode D6-D9 forms bridge switch; its positive pole connects the positive pole of controllable silicon CR03; ground connection after the negative pole of its negative pole and controllable silicon CR03 joins, the outlet of the ground of phase shortage, current foldback circuit 2 and the C phase coil of threephase current transformer 4 is joined.
3, phase shortage according to claim 2, overcurrent, electric leakage protection switch; it is characterized in that: described leakage protection circuit 1 is made up of earth leakage protective device special circuit integrated chip and peripheral circuit; the bridge switch that its output is formed for diode D14-D17; its two mid points are in parallel with two mid points that the diode D6-D9 of above-mentioned phase shortage, current foldback circuit 2 forms bridge switch respectively, and parallel conducting wire is connected with power supply A, C respectively.
4, phase shortage according to claim 3, overcurrent, electric leakage protection switch; it is characterized in that: described leakage tripping device L is connected on after above-mentioned two bridge switch parallel connections and A mutually in the connection lead of power supply; it also has piezo-resistance MOV1 and anti-interference capacitor C 18, and they are attempted by between two output leads that are connected with power supply A, C respectively after above-mentioned two bridge switch parallel connections.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200620023315 CN2874882Y (en) | 2006-01-10 | 2006-01-10 | Complex protective switch for lost phase, overcurrent and leakage |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200620023315 CN2874882Y (en) | 2006-01-10 | 2006-01-10 | Complex protective switch for lost phase, overcurrent and leakage |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2874882Y true CN2874882Y (en) | 2007-02-28 |
Family
ID=37781471
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 200620023315 Expired - Fee Related CN2874882Y (en) | 2006-01-10 | 2006-01-10 | Complex protective switch for lost phase, overcurrent and leakage |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2874882Y (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101860013A (en) * | 2010-05-21 | 2010-10-13 | 无锡市百川科技有限公司 | Motor protective device |
| CN104600573A (en) * | 2015-01-08 | 2015-05-06 | 淮北申正电力电控设备有限公司 | Welding machine dedicated air switch |
| CN104795797A (en) * | 2015-05-12 | 2015-07-22 | 芜湖天宇科技开发有限公司 | Wound type motor protection system and sampling method thereof |
| CN107681629A (en) * | 2017-11-01 | 2018-02-09 | 乐清市诚富电器科技有限公司 | The full-automatic control circuit of earth leakage of one kind band overcurrent protective and its method |
-
2006
- 2006-01-10 CN CN 200620023315 patent/CN2874882Y/en not_active Expired - Fee Related
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101860013A (en) * | 2010-05-21 | 2010-10-13 | 无锡市百川科技有限公司 | Motor protective device |
| CN101860013B (en) * | 2010-05-21 | 2012-06-20 | 无锡市百川科技有限公司 | Motor protective device |
| CN104600573A (en) * | 2015-01-08 | 2015-05-06 | 淮北申正电力电控设备有限公司 | Welding machine dedicated air switch |
| CN104600573B (en) * | 2015-01-08 | 2017-10-10 | 淮北申正电力电控设备有限公司 | Electric welding machine Special-purpose air switch |
| CN104795797A (en) * | 2015-05-12 | 2015-07-22 | 芜湖天宇科技开发有限公司 | Wound type motor protection system and sampling method thereof |
| CN107681629A (en) * | 2017-11-01 | 2018-02-09 | 乐清市诚富电器科技有限公司 | The full-automatic control circuit of earth leakage of one kind band overcurrent protective and its method |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN102067263A (en) | Wiring device with leakage detection function | |
| CN2874882Y (en) | Complex protective switch for lost phase, overcurrent and leakage | |
| CN103022978A (en) | Under-voltage protection circuit for multi-pulse-wave rectifying circuit | |
| CN103928936B (en) | For reducing converter and the conversion equipment that transformer is affected by zero-sequence current | |
| CN201197073Y (en) | Ground flashover detection circuit for magnetic controlled shunt reactor exciting winding casing tube | |
| CN100370664C (en) | Arc and leakage protector | |
| CN102508155A (en) | Test circuit for internally installed load switch of intelligent electric energy meter | |
| CN204068191U (en) | AFDD fault electric arc protector | |
| CN201075665Y (en) | Protection test control apparatus having functions of alternating-current/direct-current general use and checking the same term | |
| CN101877476A (en) | Protector for preventing three-phase power circuit from generating high voltage | |
| CN201188536Y (en) | Protector for over voltage, undervoltage and lack phase of power supply | |
| CN203826975U (en) | Zero-sequence current converter and zero-sequence current converting device | |
| CN208675104U (en) | A kind of multiple-channel output is under-voltage and short-circuit protection circuit | |
| CN202281825U (en) | Intelligent electric energy meter built-in load switch test circuit | |
| CN2762332Y (en) | Arc and earth leakage protective device | |
| CN210724191U (en) | Leakage open-phase protection circuit breaker | |
| CN2800613Y (en) | Submersible motor pump, electromotor phase-failure, overcurrent automatic protection switch | |
| CN206099289U (en) | Four -pole circuit breaker | |
| CN109994340A (en) | A kind of heavy dynamic circuit and its control method | |
| CN2722484Y (en) | Phase-off and phase sequence protector of three-phase motor for air conditioner compressor | |
| CN2760563Y (en) | Sampling circuit for detecting triphase or quadri-phase unbalance current and grounding current | |
| CN203289195U (en) | Prepaying miniature breaker | |
| CN2596541Y (en) | Intelligent multifunction breaker | |
| CN201178296Y (en) | Residual current actuating apparatus having earthing protection function | |
| CN2814758Y (en) | Three-phase asynchronous motor open-phase in stantaneous overload delay protector |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20070228 Termination date: 20140110 |