CN202737437U - Phase failure protection circuit used for three-phase low pressure alternating current power source - Google Patents
Phase failure protection circuit used for three-phase low pressure alternating current power source Download PDFInfo
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- CN202737437U CN202737437U CN 201220351298 CN201220351298U CN202737437U CN 202737437 U CN202737437 U CN 202737437U CN 201220351298 CN201220351298 CN 201220351298 CN 201220351298 U CN201220351298 U CN 201220351298U CN 202737437 U CN202737437 U CN 202737437U
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- alternating current
- power source
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Abstract
The utility model discloses a phase failure protection circuit used for a three-phase low pressure alternating current power source. The phase failure protection circuit used for the three-phase low pressure alternating current power source comprises contactors KM, relays I and relays II, wherein a main contact of the contactors KM is connected with the three-phase low pressure alternating current power source, coil of the relays I and coil of the relays II are respectively connected between circuits of two different phases of the three-phase low pressure alternating current power source, one of the two phases is a common circuit, monitoring for two circuit voltages is realized, coil of the contactors KM are connected between the other two phase circuits except the common circuit, and the relays I and the relays II respectively have a pair of normal open contacts which are respectively connected in series with the contactor coil circuit. The phase failure protection circuit used for the three-phase low pressure alternating current power source has advantages of simple structure, stable performance and high reliability and can avoid burning-out of the motor caused by phase failure of the three-phase low pressure alternating current power source.
Description
Technical field
The utility model relates to circuit control technology field, relates in particular to a kind of open-phase protection circuit for the three-phase low-voltage AC power.
Background technology
Use a lot of three-phase low-voltage alternating current motors in industrial production, in use the open circuit protection system is unreliable owing to the three-phase low-voltage alternating current motor, the phenomenon that causes motor to burn out because of the disconnected phase of three-phase low-voltage AC power often occurs.
Summary of the invention
The purpose of this utility model is exactly the problem that causes motor to burn out because of the disconnected phase of three-phase low-voltage AC power in order to solve the three-phase low-voltage alternating current motor; A kind of open-phase protection circuit for the three-phase low-voltage AC power is provided; Simple in structure, stable performance, reliability are high, have avoided the phenomenon that causes motor to burn out because of the disconnected phase of three-phase low-voltage AC power.
To achieve these goals, the utility model adopts following technical scheme:
A kind of open-phase protection circuit for the three-phase low-voltage AC power; comprise contactor KM; the relay I; the relay II; the main contacts of described contactor KM is connected with the three-phase low-voltage AC power; the coil of its repeat circuit I; the coil of relay II is connected between the circuit of different two-phases of three-phase low-voltage AC power; wherein one be shared line mutually; realization is monitored these two line voltages; contactor KM coil is connected between the other two-phase circuit except common line, described relay I; the relay II respectively has a pair of normally opened contact to be concatenated into respectively the circuit at contactor coil place.
Operation principle of the present utility model: the utility model comprises contactor KM, the relay I, the relay II, the main contacts of described contactor KM is connected with the three-phase low-voltage AC power, the coil of its repeat circuit I, the coil of relay II is connected between the circuit of different two-phases of three-phase low-voltage AC power, wherein one be shared line mutually, realization is monitored these two line voltages, contactor KM coil is connected between the other two-phase circuit except common line, described relay I, the relay II respectively has a pair of normally opened contact to be concatenated into respectively the circuit at contactor coil place.When each phase voltage in the three-phase low-voltage AC power was normal, the coil of two relays got electric, and its normally opened contact is closed, and the coil of contactor gets electric closure, and the main contacts of contactor is closed, powers to power consumption equipment.The one phase power supply phase time that breaks is arranged in the three-phase low-voltage AC power, and the coil of contactor can not get electric, and its main contacts can be closed, can not power to power consumption equipment, prevents that the power consumption equipment three characteristics of the middle term power phase shortage from causing damage.
The beneficial effects of the utility model: simple in structure, stable performance, reliability are high.Avoided the phenomenon that causes motor to burn out because of the disconnected phase of three-phase low-voltage AC power.
Description of drawings
Fig. 1 is circuit principle structure schematic diagram of the present utility model;
Embodiment
Below in conjunction with accompanying drawing and embodiment the utility model is described further.
A kind of open-phase protection circuit for the three-phase low-voltage AC power; by reference to the accompanying drawings 1; comprise contactor KM; the relay I; the relay II; the main contacts of described contactor KM is connected with the three-phase low-voltage AC power; the coil of its repeat circuit I; the coil of relay II is connected between the circuit of different two-phases of three-phase low-voltage AC power; wherein one be shared line mutually; realization is monitored these two line voltages; contactor KM coil is connected between the other two-phase circuit except common line, described relay I; the relay II respectively has a pair of normally opened contact to be concatenated into respectively the circuit at contactor coil place.Specifically:
The coil of relay I KA1 is received mutually power supply of B phase and C, monitoring line voltage BC.The coil of relay II KA2 is received mutually power supply of A phase and C, monitoring line voltage AC.Relay I KA1, relay II KA2 respectively have a pair of normally opened contact to receive A phase and B phase power supply respectively with after the coil of contactor KM1 is connected, monitoring line voltage AB.The main contacts of contactor KM1 is concatenated in the three-phase low-voltage AC power.When each phase voltage in the three-phase low-voltage AC power was normal, the coil of relay I KA1, relay II KA2 got electric, and its normally opened contact is closed, and the coil of contactor KM1 gets electric closure, and the main contacts of contactor KM1 is closed, powers to power consumption equipment.The one phase power supply phase time that breaks is arranged in the three-phase low-voltage AC power, suppose the C phase power supply phase of breaking, the coil of relay I KA1, relay II KA2 must not be electric, its normally opened contact disconnects, the coil of contactor KM1 just can not get electric yet, its main contacts can be not closed, can not power to power consumption equipment, prevents that the power consumption equipment three characteristics of the middle term power phase shortage from causing damage.
Although above-mentionedly by reference to the accompanying drawings the embodiment of utility model is described; but be not the restriction to the utility model protection range; one of ordinary skill in the art should be understood that; on the basis of the technical solution of the utility model, those skilled in the art do not need to pay various modifications that creative work can make or distortion still in protection range of the present utility model.
Claims (1)
1. open-phase protection circuit that is used for the three-phase low-voltage AC power; it is characterized in that; comprise contactor KM; the relay I; the relay II; the main contacts of described contactor KM is connected with the three-phase low-voltage AC power; the coil of its repeat circuit I; the coil of relay II is connected between the circuit of different two-phases of three-phase low-voltage AC power; wherein one be shared line mutually; contactor KM coil is connected between the other two-phase circuit except common line, described relay I; the relay II respectively has a pair of normally opened contact to be concatenated into respectively the circuit at contactor coil place.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220351298 CN202737437U (en) | 2012-07-19 | 2012-07-19 | Phase failure protection circuit used for three-phase low pressure alternating current power source |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220351298 CN202737437U (en) | 2012-07-19 | 2012-07-19 | Phase failure protection circuit used for three-phase low pressure alternating current power source |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202737437U true CN202737437U (en) | 2013-02-13 |
Family
ID=47663099
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201220351298 Expired - Fee Related CN202737437U (en) | 2012-07-19 | 2012-07-19 | Phase failure protection circuit used for three-phase low pressure alternating current power source |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202737437U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105024341A (en) * | 2015-08-17 | 2015-11-04 | 佛山电力设计院有限公司 | Circuit breaker and circuit break system having zero-line disconnection and open-phase protection function |
| CN105305384A (en) * | 2015-09-15 | 2016-02-03 | 国网山东胶州市供电公司 | Line default phase alternating current contactor lockout protection device |
-
2012
- 2012-07-19 CN CN 201220351298 patent/CN202737437U/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105024341A (en) * | 2015-08-17 | 2015-11-04 | 佛山电力设计院有限公司 | Circuit breaker and circuit break system having zero-line disconnection and open-phase protection function |
| CN105024341B (en) * | 2015-08-17 | 2018-08-14 | 佛山电力设计院有限公司 | With off zero and open-phase protection breaker and open-circuit system |
| CN105305384A (en) * | 2015-09-15 | 2016-02-03 | 国网山东胶州市供电公司 | Line default phase alternating current contactor lockout protection device |
| CN105305384B (en) * | 2015-09-15 | 2016-10-12 | 国网山东省电力公司胶州市供电公司 | Circuit phase shortage A.C. contactor latch-up protection device |
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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: 20130213 Termination date: 20160719 |
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| CF01 | Termination of patent right due to non-payment of annual fee |