CN201629558U - Phase failure and phase sequence protecting device - Google Patents
Phase failure and phase sequence protecting device Download PDFInfo
- Publication number
- CN201629558U CN201629558U CN2009203141576U CN200920314157U CN201629558U CN 201629558 U CN201629558 U CN 201629558U CN 2009203141576 U CN2009203141576 U CN 2009203141576U CN 200920314157 U CN200920314157 U CN 200920314157U CN 201629558 U CN201629558 U CN 201629558U
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- phase
- circuit
- voltage
- phase sequence
- relay
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Abstract
The utility model discloses a phase failure and phase sequence protecting device aiming at overcoming the defect of the insecurity of the phase sequence protecting device in the prior art, and providing a three-phase alternating-current supply phase failure and phase sequence protecting device with security protection measures. The device is technically characterized by comprising a sampling circuit, a rectifying circuit and a controlling circuit; the output end of the rectifying circuit is connected with a voltage dependent resistor RV in parallel so as to form a overpressure protection circuit; and the controlling circuit is connected with a voltage-regulator tube Dw in series so as to form a low-voltage protection and current-limiting protection circuit. The phase failure and phase sequence protecting device can effectively protect the system when the system has overvoltage, can protect a rectifier when the device is switched on, can cut off the voltage-regulator tube when having misphase, reliably prevents a relay from being jointed, and protects the whole system.
Description
Technical field
The utility model relates to a kind of protective device of three-phase alternating-current supply, the specifically a kind of phase failure and phase sequence device that is used for three-phase alternating-current supply.
Background technology
The existing protective device that is used for the three-phase alternating-current supply phase failure and phase sequence, be to adopt unit such as sampling, rectification and filtering, driving to form mostly, as Chinese patent notification number CN 2747761Y, December 21 2005 day for announcing, name is called in the phase sequence device of the three-phase alternating-current supply ' ' and proposes: the phase sequence device of three-phase alternating-current supply, its technical essential is that resistor R 1, R2 are connected into the R phase load, and capacitor C1 becomes the S phase load separately; Resistor R 1, R2 and capacitor C1 two loop parallel connections, get between the end points after this a little voltage and resistor R 3, R4 step-down of being connected in parallel and be connected in series rectifier bridge heap D, the output of bridge heap D direct current is supplied with relay coil J after filtering capacitor C2 filtering, thereby connects the secondary circuit power supply.The equipment that this patent proposed possesses the most basic phase failure, fault-phase protection function; but the safety precautions of shortage itself; for example jumbo capacitor directly is connected the output of rectifier and makes rectifier have potential safety hazard; this device also lacks the overpressure protection to relay; if the fail safe of this device itself is unreliable, that just is difficult to the safety of reliable protection power consumption equipment.
The utility model content
The utility model overcomes the shortcoming of prior art, and a kind of three-phase alternating-current supply phase failure and phase sequence device that has safety precautions itself is provided.
The purpose of this utility model is achieved by following technical proposals: a kind of phase failure and phase sequence device; the control circuit that comprise the sample circuit that connects power supply, the rectification circuit that is connected with sample circuit, is connected with rectification circuit output end; the utility model is at rectification circuit output end piezo-resistance RV in parallel, and a voltage-stabiliser tube Dw connects in control circuit.
Described piezo-resistance RV forms the overpressure protection circuit.
Described sample circuit comprises the resistor R 1 of a termination power A phase, the capacitor C1 of a termination power B phase, the other end of the other end of resistor R 1 and capacitor C1 is connected and is connected with an input of rectification circuit, one termination power C phase of resistor R 2, the other end is connected with another input of rectification circuit.
Described rectification circuit is made up of bridge rectifier V.
The described control circuit that is connected with rectification circuit output end is made up of the parallel circuits of filtering capacitor C2 and relay K, voltage-stabiliser tube Dw who is used for under-voltage protection of series connection on this parallel circuits, and this series-parallel circuit is connected with the output of rectifier V.
Described capacitor C2 is in parallel with relay K, and its effect is with rectified current filtering, makes the stable operating voltage on the relay K, so capacitor C2 will get big capacity usually.Yet jumbo capacitor rigidly connects logical moment at circuit is equivalent to short circuit, because the internal resistance of rectifier is very little, if not current-limiting resistance of series connection in circuit, then equal output short circuit with rectifier V, this can make the rectifying tube that constitutes rectifier V be subjected to great impulse current, is easy to cause the rectifying tube punch through damage; Voltage-stabiliser tube Dw of series connection in circuit, can rigidly connect logical moment at circuit and be in conducting phase because of voltage-stabiliser tube, can play dividing potential drop and metering function, and foregoing prior art is just because of directly be connected jumbo capacitor the output of rectifier and make rectifier have potential safety hazard.
Described voltage-stabiliser tube Dw avoids the function that impulse current punctures except having the above-mentioned rectifier V that can protect, and its another important effect is that the misphase to system provides protection, promptly forms under-voltage protecting circuit by voltage-stabiliser tube; When the connection generation misphase of three phase mains; because the phase shift effect of capacitor C1; make input, the output voltage of rectifier V all be lower than 24V; the electric current that flows through among the voltage-stabiliser tube Dw is minimum; add the dividing potential drop of voltage-stabiliser tube Dw; then the voltage on the relay K promptly blocks load system secondary control circuit well below engaging voltage, and here voltage-stabiliser tube plays the effect of under-voltage protecting circuit.
Be connected in parallel on the piezo-resistance RV of rectifier output end; not conducting under normal circumstances; when overvoltage appears in rectifier output end; the piezo-resistance conducting; provide shunt circuit to voltage-stabiliser tube and relay circuit; can protect voltage-stabiliser tube Dw, relay K and capacitor C2 not to damage, guarantee that relay K misoperation can not take place, here piezo-resistance plays the effect of overpressure protection circuit.
Owing in circuit, insert voltage-stabiliser tube Dw and piezo-resistance RV, make the phase failure and phase sequence device itself be subjected to effective protection, thereby can really play the effect of the phase failure and phase sequence.
The operation principle of the utility model phase failure and phase sequence device is described below:
As three phase mains A, B, when C is positive phase sequence, the about 23V of the voltage on the relay K makes the relay K adhesive, and load system secondary control circuit is connected in its auxiliary contact adhesive, the operation of electrical secondary system normal starting.
As three phase mains A, B, when C is negative phase sequence, the about 5V of the voltage on the relay K, then relay K can not adhesive, and its auxiliary contact can not adhesive, blocks load system secondary control circuit, and load system can not the normal starting operation.
When power supply C cut off the power supply mutually, rectifier did not have alternating voltage, and the relay K dead electricity discharges, and its auxiliary contact disconnects, and blocks load system secondary control circuit, and electrical secondary system can not the normal starting operation.
When three phase mains arbitrary opened circuit mutually, rectifier output all was lower than 24V, and voltage-stabiliser tube ends, and relay can not be closed, blocked the secondary control circuit of load system;
Load system secondary control circuit power supply is provided by A, B two-phase, when A, B are arbitrary when cutting off the power supply mutually, and the outage of load system secondary control circuit, load system can not the normal starting operation.
To sum up analyze: when A, B, C three-phase generation anti-phase or a scarce phase time, relay K all can not engage, the outage of load system secondary control circuit, thus reach the purpose of protecting whole system and motor.
The beneficial effects of the utility model are:
1. system can be effectively protected when overvoltage taking place;
2. can play protection to rectifier in the moment that device rigidly connects energize;
3. voltage-stabiliser tube ends during misphase, places restrictions on relay reliably and engages.
Description of drawings
Fig. 1 is the schematic diagram of a kind of embodiment of the utility model.
Embodiment
Below in conjunction with accompanying drawing and specific embodiments the utility model is further described.
Embodiment: as shown in Figure 1, the phase failure and phase sequence device, comprise the resistor R 1 of a termination power A phase, the capacitor C1 of a termination power B phase, the other end of the other end of resistor R 1 and capacitor C1 is connected and is connected with the input of bridge rectifier V; One termination power C phase of resistor R 2, the other end is connected with another input of rectifier V; The voltage-stabiliser tube Dw that connects after filtering capacitor C2 and the relay K parallel connection, this series-parallel circuit and piezo-resistance RV are connected in the output of rectifier V in parallel.
Bridge rectifier is made up of rectifier diode VD1～VD4,
Suitably choose the value of R1, R2 and C1, when the three phase mains positive phase sequence output voltage of rectifier 45 to 48V, voltage-stabiliser tube reverse breakdown then, voltage of voltage regulation is 24V, pressure drop on relay K is 21 to 23V, and relay engages, and load system secondary control circuit is connected; When three phase mains misphase preface, the input of rectifier V, output voltage all are lower than 24V, and voltage-stabiliser tube Dw ends, voltage on the relay K is 3 to 6V, and then relay K can not adhesive, and its auxiliary contact K1 can not adhesive, block load system secondary control circuit, load system can not the normal starting operation.When C cuts off the power supply mutually, the rectifier no-output, relay electric-loss is thrown off; When A mutually or B when cutting off the power supply mutually, relay is under-voltage can not to be engaged, load system outage simultaneously.
The utility model phase failure and phase sequence device can be effectively protected system when overvoltage takes place; Can make rectifier avoid the damage of impulse current; Voltage-stabiliser tube ends when the misphase or the phase failure, places restrictions on relay reliably and engages, and protects the safety of whole system effectively.
Claims (4)
1. the phase failure and phase sequence device; the control circuit that comprise the sample circuit that connects power supply, the rectification circuit that is connected with sample circuit, is connected with rectification circuit output end; it is characterized in that; at rectification circuit output end piezo-resistance RV in parallel, voltage-stabiliser tube Dw of series connection in control circuit.
2. the phase failure according to claim 1 and phase sequence device; it is characterized in that; described sample circuit comprises the resistor R 1 of a termination power A phase, the capacitor C1 of a termination power B phase; the other end of the other end of resistor R 1 and capacitor C1 is connected and is connected with an input of rectification circuit; one termination power C phase of resistor R 2, the other end is connected with another input of rectification circuit.
3. the phase failure according to claim 1 and 2 and phase sequence device is characterized in that described rectification circuit is made up of bridge rectifier V.
4. the phase failure according to claim 1 and 2 and phase sequence device is characterized in that, the described control circuit that is connected with rectification circuit output end is made up of the parallel circuits of filtering capacitor C2 and relay K.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009203141576U CN201629558U (en) | 2009-11-06 | 2009-11-06 | Phase failure and phase sequence protecting device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009203141576U CN201629558U (en) | 2009-11-06 | 2009-11-06 | Phase failure and phase sequence protecting device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201629558U true CN201629558U (en) | 2010-11-10 |
Family
ID=43060957
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2009203141576U Expired - Fee Related CN201629558U (en) | 2009-11-06 | 2009-11-06 | Phase failure and phase sequence protecting device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201629558U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113612203A (en) * | 2021-08-06 | 2021-11-05 | 国网河北省电力有限公司检修分公司 | Device and method for protecting phase sequence relay of transformer |
-
2009
- 2009-11-06 CN CN2009203141576U patent/CN201629558U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113612203A (en) * | 2021-08-06 | 2021-11-05 | 国网河北省电力有限公司检修分公司 | Device and method for protecting phase sequence relay of transformer |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20101110 Termination date: 20141106 |
|
| EXPY | Termination of patent right or utility model |