CN2079378U - Three-phase motor phase-loss protector - Google Patents
Three-phase motor phase-loss protector Download PDFInfo
- Publication number
- CN2079378U CN2079378U CN 90222704 CN90222704U CN2079378U CN 2079378 U CN2079378 U CN 2079378U CN 90222704 CN90222704 CN 90222704 CN 90222704 U CN90222704 U CN 90222704U CN 2079378 U CN2079378 U CN 2079378U
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- Prior art keywords
- phase
- relay
- filter
- bridge rectifier
- output
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Abstract
The utility model relates to a phase-loss protector of three-phase motor, which is composed of a detector of phase loss, a bridge type rectifier, current-limiting filters and a relay which are sequentially connected. The detector of phase loss is composed of three same transformers, and the secondary coils of the three transformers are in end to end connection with each other; the current-limiting filters comprises a resistance-capacitance type current-limiting filter and an electronic filter; the normally closed contact of the relay is connected in series with the on-off control system of the motor.
Description
The utility model belongs to the harmful variation that departs from the normal electrical working condition and automatic disconnection emergency protective circuit device, the particularly threephase motor protective device when the power supply phase shortage that directly reacts.
As everyone knows, when three phase mains one mutually or during the two-phase phase shortage, the motor that connects thereon burns out easily.For this reason, many people have designed open phase protector in many styles.For example: the 89203436.X patent application, adopt three groups of electric current mutual inductors of serial connection mutually, the protector that bridge rectifier, filter capacitor and relay are formed (total No. 227 of utility model patent communique, P135); 89210775.8 number patent application, then specialized designs the multifunctional protection device (the same) of 1.1KW to 75KW three-phase alternating-current motor.Here, analyze the technical scheme that No. 90210087.4 patent application proposed.This scheme adopted three single protective circuits that three groups of transformers, rectifier filter, relay form (total No. 261 of utility model patent communique, P126), its control unit and the isolation of main electrical network are so interference free performance is preferable; After once setting, can not produce misoperation.But, can know that significantly owing to adopted three single protective devices, thereby complex structure, components and parts are many, particularly threephase load is arranged when power supply, its isolated neutral and when phase shortage took place, protector may be failure to actuate.
Task of the present utility model just is to provide a kind of threephase motor power supply open phase protector.This protector reliable in action, simple in structure, components and parts are few, can keep the good advantage of anti-interference again.
New design discloses as follows: this protector is made up of phase loss detector, bridge rectifier, limiting filter and relay.
Phase loss detector adopts three identical transformers, and an end of its primary coil links to each other with three phase lines of motor power line respectively, and the other end of primary coil and receiving on the zero line; Three secondary coils connect from beginning to end, draw the terminal of the top and the 3rd the transformer secondary output coil of first transformer secondary output coil, link to each other with the bridge rectifier of next stage.The back is limiting filter and relay coil again, and the normally-closed contact of relay is connected in series among the original on-off control system of motor.
In power supply just often, the vector of three transformer secondary output induced voltages and be zero.When power supply lacks one or two phase times, normal two or one phase voltage is added on the primary coil with the corresponding transformer of phase shortage by motor winding, so level induces a voltage signal that has changed on the coil secondarily, this moment the vector of three transformer secondary output induced voltages and non-vanishing, be that phase loss detector is defeated by alternating voltage of bridge rectifier, after rectification, current limliting filtering, direct-current working volts are added on the relay, so its normally-closed contact disconnects, motor switch control system dead electricity makes motor break away from power supply.
Utilize normal three-phase mains voltage vector and be the threephase motor power supply open phase protector that zero principle is made; have only a cover rectification, current limliting filtering, relay-set; therefore simple in structure; components and parts are few; volume is little, and reliable in action has also kept strong interference immunity; can not produce the characteristics of misoperation, be applicable to the three-phase power consumption equipment that 0.5KW is above.
Fig. 1 is a block diagram of the present utility model, as Figure of abstract.Fig. 2 is one of the embodiment accompanying drawing.Fig. 3 is two accompanying drawings of embodiment.
During enforcement, the utility model can have multiple concrete scheme, and common ground is that phase loss detector ［ 1 ］ all adopts three identical transformer T
1, T
2, T
3, primary coil separately with motor
Three phase lines link to each other the normally-closed contact K of relay ［ 4 ］
1Seal in motor
Original on-off control system.
From one of Fig. 1,2 embodiment, phase loss detector ［ 1 ］ adopts 220
/ 10
Three transformers of 1W, method of attachment such as above-mentioned.Bridge rectifier ［ 2 ］ adopts four diodes of 100mA/100V.Limiting filter ［ 3 ］ is current-limiting resistance R
1, electrochemical capacitor C
2, relay ［ 4 ］ normally-closed contact K
2After three's parallel connection, by the anode of an anodal termination rectifier ［ 2 ］ output of electrochemical capacitor C2, and the other end and electrolytic capacitor filter C
1Anode link to each other filter capacitor C
1The negative terminal of negative terminal and rectifier ［ 2 ］ output link to each other.R
1Be 470 Ω/0.5W, C
2Be on the 100 μ F/25V, the coil of relay ［ 4 ］ is connected in parallel on filter capacitor C
1Two ends, this device operating voltage 12
, release current 〉=1mA, contact load 220
, 3A, for example JQX4F-2Z.Its normally-closed contact K
1Seal in motor
Switching circuit, during phase shortage, enter open-circuit condition.
From two of Fig. 1,3 embodiment.It has done improvement at limiting filter ［ 3 ］, adopts electronic filter.Middle power tube V
1Collector electrode pass through resistance R
2Link to each other with base stage, base stage is again by a parallel circuits (electrochemical capacitor C
4With voltage stabilizing didoe V
2Parallel connection) connects the negative terminal that rectifier ［ 2 ］ is exported.Middle power tube V
1Collector electrode and filter capacity C
3Positive pole link to each other, and receive the anode of rectifier ［ 2 ］ output.The coil of relay ［ 4 ］, power tube V in the termination
1Emitter, the negative terminal of another termination rectifier ［ 2 ］ output, all the other the same examples.Here R
2Desirable 1K, V
2The voltage stabilizing value is 14V, C
3Get 220 μ F/50V, C
4Get 100 μ F/25V.This routine antijamming capability is stronger.
In the enforcement, the connection of removing phase shortage detector ［ 1 ］, relay ［ 4 ］ is generally constant, and the specification of its device specification and remaining circuit components and parts, connection are also variable several.
Claims (2)
1, a kind of threephase motor power supply open phase protector, by phase loss detector [1], and the bridge rectifier [2] that connects successively, limiting filter [3] and relay [4] are formed three identical transformer T of formation phase loss detector [1]
1, T
2, T
3Primary coil, the one end respectively with motor
Three phase lines of power line link to each other, and the other end all is connected with zero line, and the coil of relay [4] is attempted by on the output of limiting filter [3], the normally-closed contact K of relay [4]
1Be connected on motor
The thread switching control road in, it is characterized in that:
In the phase loss detector [1], three transformer T
1, T
2, T
3Secondary coil join end to end the first transformer T
1Secondary top and the 3rd transformer T
3Secondary tail end is the output of this detector, links to each other with bridge rectifier [2].
2, as the said threephase motor power supply of claim 1 open-phase protection, its feature is in limiting filter ［ 3 ］;
A, current-limiting resistance R
1, electrochemical capacitor C
2, relay ［ 4 ］ a pair of normally-closed contact K
2After three's parallel connection, by electrochemical capacitor C
2An anodal end links to each other the other end and filter capacitor C with the output plus terminal of bridge rectifier ［ 2 ］
1Anodal linking to each other, as the output plus terminal of limiting filter ［ 3 ］, filter capacitor C
1The negative terminal of negative pole and bridge rectifier ［ 2 ］ output link to each other after, as the output negative terminal of limiting filter ［ 3 ］, or
B, middle power tube V
1Collector electrode, base stage between and go up resistance R
2After, base stage and electrochemical capacitor C
4, voltage stabilizing didoe V
2Parallel circuits in electrochemical capacitor C
4Anode link to each other the negative terminal of the other end of this parallel circuits and bridge rectifier ［ 2 ］, filter capacitor C
3An end of negative terminal, relay ［ 4 ］ coil link to each other middle power tube V
1Collector electrode and filter capacitor C
3The anode of positive pole, bridge rectifier ［ 2 ］ device link to each other, and emitter links to each other with the other end of relay ［ 4 ］ coil.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 90222704 CN2079378U (en) | 1990-10-25 | 1990-10-25 | Three-phase motor phase-loss protector |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 90222704 CN2079378U (en) | 1990-10-25 | 1990-10-25 | Three-phase motor phase-loss protector |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2079378U true CN2079378U (en) | 1991-06-19 |
Family
ID=4900603
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 90222704 Withdrawn CN2079378U (en) | 1990-10-25 | 1990-10-25 | Three-phase motor phase-loss protector |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2079378U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104682742A (en) * | 2015-02-06 | 2015-06-03 | 广东南冠电气有限公司 | Single-chip microcomputer power supply circuit applied to faulted neutral line and open phase protection circuit breaker |
| CN106877772A (en) * | 2017-01-04 | 2017-06-20 | 李振久 | A kind of three-phase contactless alternating-current switch of alternative A.C. contactor |
-
1990
- 1990-10-25 CN CN 90222704 patent/CN2079378U/en not_active Withdrawn
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104682742A (en) * | 2015-02-06 | 2015-06-03 | 广东南冠电气有限公司 | Single-chip microcomputer power supply circuit applied to faulted neutral line and open phase protection circuit breaker |
| CN106877772A (en) * | 2017-01-04 | 2017-06-20 | 李振久 | A kind of three-phase contactless alternating-current switch of alternative A.C. contactor |
| CN106877772B (en) * | 2017-01-04 | 2024-01-05 | 李振久 | Three-phase contactless AC switch capable of replacing AC contactor |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| 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 |