CN2144885Y - Universal phase-failure protector for explosion-proof three-phase motor - Google Patents
Universal phase-failure protector for explosion-proof three-phase motor Download PDFInfo
- Publication number
- CN2144885Y CN2144885Y CN 92200793 CN92200793U CN2144885Y CN 2144885 Y CN2144885 Y CN 2144885Y CN 92200793 CN92200793 CN 92200793 CN 92200793 U CN92200793 U CN 92200793U CN 2144885 Y CN2144885 Y CN 2144885Y
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- CN
- China
- Prior art keywords
- phase
- explosion
- proof
- failure protector
- universal
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- Expired - Fee Related
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Abstract
The utility model relates to a universal phase-failure protector for an explosion-proof three-phase motor, which adopts complete electronic circuits to realize the function of security protection. The universal phase-failure protector for an explosion-proof three-phase motor has no mechanical contacts, and no electric connection between the input and the output ends. The transmission path of control signals adopts the signal coupling mode of a photoelectric coupler to realize a three-signal NOR-logic addition. The control signals of the output of the universal phase-failure protector for an explosion-proof three-phase motor adopts a switch without mechanical contacts, which is conducted by the triggering of a thyristor to realize the isolation between the input end and the output end. On the job, the universal phase-failure protector for an explosion-proof three-phase motor can not generate electric arcs and sparks. The universal phase-failure protector for an explosion-proof three-phase motor can be widely used for the environment where combustible gas exists or the environment with higher dust concentration with safety.
Description
The utility model belongs in the electrotechnics protects equipment automatically to the motor safety running status.
Threephase motor is to use electric machinery very widely in the industrial production, according to statistics: the one of the main reasons that threephase motor breaks down is under motoring, suddenly take place open-phase running or single phasing (be have suddenly in the three phase supply circuit one mutually or the blown fuse of two-phase power supply and cause this phase power-fail), this fault accounts for about half of threephase motor total failare number, the lighter causes the motor damaged, heavy then burn motor, cause stop work and production, economic loss is serious.Therefore, people give great concern to this problem already.So various phase failure protectors are come out one after another.Resistance-type tape relay control type is arranged, condenser type tape relay control type is arranged, transformer type tape relay control type or the like is arranged.They have played protective effect to the threephase motor safe operation under the general work environment.But; for in particular surroundings (such as the environment that has imflammable gas; or contain the environment of higher dust concentration) in owing to just may cause electric arc and spark during the mechanical contact conversion on off operating mode of relay during the above-mentioned protector protection phase failure, this is the absolute inaccurate phenomenon that occurs (because of causing fire or dust explosion) under particular surroundings.Therefore urgent need is a kind of in particular surroundings can play open phase protection, prevents to produce the phase failure protector of spark again.
The purpose of this utility model provides and a kind ofly can play the threephase motor open phase protection, can prevent to produce the phase failure protector of electric arc and spark again, i.e. explosion-proof type threephase motor phase failure protector.
In order to achieve the above object, explosion-proof type threephase motor phase failure protector provided by the utility model adopts the all-electronin circuit to realize safety protection function, does not have any mechanical contact, no any electric connection between input, the output.Adopted the signal coupled modes of photoelectrical coupler to realize three signal NOR-logic additions in its control signal transmission channel.Its output control signal has adopted the nothing machinery contact switch of controllable silicon triggering and conducting.Realized the electrical isolation between input and the output simultaneously.
Below in conjunction with accompanying drawing the utility model is done further to describe in detail, Fig. 1 is outage protector electrical schematic diagram
Fig. 2 is protector lead-in wire figure
Fig. 3 is the executive circuit schematic diagram of protected motor
Fig. 4 is protected electromotor control circuit schematic diagram
(A among Fig. 11－A
2）、（B
1－B
2）、（C
1－C
2) be connected on protected motor for electrical fuses ［ 14 ］ two ends, when a certain when fusing mutually in the three phase supply power supply. Example: B1－B
2Between fusible link fusing, B1－B
2Between ac voltage signal through current-limiting resistance ［ 1 ］, rectification circuit ［ 2 ］ becomes pulsating dc voltage, through electric capacity ［ 3 ］ filtering, become DC voltage, be added on the inner light emitting diode of photoelectrical coupler ［ 4 ］, lumination of light emitting diode, the inner triode of photoelectrical coupler ［ 4 ］ receives after the illumination, is operated in the saturation region. Colelctor electrode output zero-signal is added to one-way SCR ［ 9 ］ control and extremely goes up, and make the control utmost point by case built in electronegative potential, one-way SCR is in blocking state. The direct current, the AC switch ［ 10 ］ that are made up of four diodes at this moment are in off state, and the bidirectional triode thyristor control utmost point is not because there being trigger impulse to be in off state. D1D
2The corresponding blocking state that is in two ends. " protector " output D among Fig. 21D
2String has cut off current supply circuit in the control circuit of consumer, make A.C. contactor C dead electricity, and the motor of carrying out in the loop breaks away from electrical network. Finished thus because of certain mutually disconnected fusible link protected motor, avoided under the single-phase operation state phenomenon of damaging because of overcurrent.
Resistance among Fig. 1 ［ 6 ］ ［ 7 ］ and triode ［ 8 ］ are zero cross detection circuits, when having voltage zero-cross, it connects by the control circuit power, the function of deenergization during current over-zero can suppress break-make moment effectively by dv/dt and the too high Radio frequency interference that produces of di/dt.
Resistance among Fig. 1 ［ 11 ］ is current-limiting resistance, and one-way SCR ［ 9 ］ and triode ［ 8 ］ are operated in the safe voltage range, and resistance ［ 12 ］ provides the control voltage of bidirectional triode thyristor ［ 13 ］.
The utility model adopts the version of all electronic circuit, none mechanical contact of armamentarium, it is little to have volume, in light weight, consumed power is few, and cost is low, characteristics such as operate time in short (being shorter than 1 millisecond) life-span length (more than 100,000 times) safe ready, do not produce electric arc and spark when biggest advantage is work, reach the requirement of explosion proof of particular surroundings.
For example adopt explosion-proof type threephase motor phase failure protector provided by the utility model to be installed in a lot of F02-72-4 of textile mills type cylinder motor (3.3KW) the power supply control cabinet of dust input (A
1-A
2, B
1-B
2, C
1-C
2) being connected on the three-phase fuse two ends, output is serially connected in artificial cut-out arbitrarily one or two fusible links in its control apparatus power line, and making No. 1000 protector malfunctions of artificial open phase fault rate is zero, all can instantaneous realization protect action at every turn.
Claims (3)
1, the general phase failure protector of a kind of explosion-proof type threephase motor, it is characterized in that adopting photoelectrical coupler in the control signal transmission channel, its output control signal adopts the nothing machinery contact switch of controllable silicon triggering and conducting, no any electric connection between the input/output terminal.
2,, it is characterized in that adopting in its signal transmission passage the signal coupled modes of photoelectrical coupler to realize three signal formula NOT logic additions by the described phase failure protector of claim 1.
3,, it is characterized in that its position of detecting default phase signal is at three power safety two ends of three phase electric machine by the described phase failure protector of claim 1.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 92200793 CN2144885Y (en) | 1992-01-10 | 1992-01-10 | Universal phase-failure protector for explosion-proof three-phase motor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 92200793 CN2144885Y (en) | 1992-01-10 | 1992-01-10 | Universal phase-failure protector for explosion-proof three-phase motor |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2144885Y true CN2144885Y (en) | 1993-10-27 |
Family
ID=33761072
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 92200793 Expired - Fee Related CN2144885Y (en) | 1992-01-10 | 1992-01-10 | Universal phase-failure protector for explosion-proof three-phase motor |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2144885Y (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105098970A (en) * | 2015-09-18 | 2015-11-25 | 施耐德万高（天津）电气设备有限公司 | Automatic change-over switch for electric-arc-free fast switching |
| CN105575061A (en) * | 2016-02-25 | 2016-05-11 | 百色学院 | Intelligent coal gas leakage safe circuit breakage system |
-
1992
- 1992-01-10 CN CN 92200793 patent/CN2144885Y/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105098970A (en) * | 2015-09-18 | 2015-11-25 | 施耐德万高（天津）电气设备有限公司 | Automatic change-over switch for electric-arc-free fast switching |
| CN105575061A (en) * | 2016-02-25 | 2016-05-11 | 百色学院 | Intelligent coal gas leakage safe circuit breakage system |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C19 | Lapse of patent right due to non-payment of the annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |