CN101888084A - Open phase protector of motor - Google Patents
Open phase protector of motor Download PDFInfo
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- CN101888084A CN101888084A CN 201010237828 CN201010237828A CN101888084A CN 101888084 A CN101888084 A CN 101888084A CN 201010237828 CN201010237828 CN 201010237828 CN 201010237828 A CN201010237828 A CN 201010237828A CN 101888084 A CN101888084 A CN 101888084A
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- motor
- phase
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- open
- normally
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Abstract
The invention discloses an open phase protector of a motor, belonging to the technical field of safety protection of motors and comprising three intermediate relays, indicating lamps and a control circuit. The open phase protector is characterized by the combination of three intermediate relays in the control circuit; a work coil of each intermediate relay is independently connected into one-phase alternating current; common terminals of the three intermediate relays are connected together and connected into a zero line; normally-open auxiliary contacts of the three intermediate relays are respectively serially connected into the control circuit of the motor and achieve the effect of protecting the motor; and normally-closed auxiliary contacts of the three intermediate relays are respectively connected with three indicating lamps and used for open phase indication. The invention has the advantages that the faults can be clearly judged by observing the open-phase indicting lamps and are convenient to solve, and meanwhile, the open-phase protector of an electric three-phase motor can be protected.
Description
Technical field
The invention belongs to motor security protection technology field, a kind of open phase protector of motor particularly is provided, is a kind of three open phase protector of motor.
Background technology
Existing motor safety guard generally adopts in major loop the series connection thermal relay to remove to control A.C. contactor in the secondary circuit, thereby reaches the purpose of protection motor.But the time-delay inexactness of thermal relay often causes protection malfunctioning, thereby damages motor, brings very big economic loss to the user.
Summary of the invention
The object of the present invention is to provide a kind of open-phase protector for three-phase motor, solved the malfunctioning problem of delay protection of thermal relay, and the phase shortage indication is arranged, easy to use, simple in structure, low cost of manufacture and easy to maintenance.
The present invention includes three auxiliary relays (a pair of normally opened contact of each auxiliary relay band and a pair of normally-closed contact), indicator light, control circuit.Be characterised in that, the combination of three auxiliary relays in the control circuit, the actuating coil of each auxiliary relay inserts separately on the alternating current of a phase, and the public terminal of three auxiliary relays connects together the back and inserts zero line.The auxiliary contact of often opening of three auxiliary relays are connected respectively and are inserted in the control loop of motor, play the effect of protection motor.The normally closed auxiliary contact of three auxiliary relays connects three indicator lights respectively, is used for phase shortage indication.
Described failure indicating circuit is that the normally-closed contact by three indicator lights and three auxiliary relays is composed in series.
The invention has the advantages that, by observing the phase shortage indicator light, can clearly judge fault, the convenient solution protected electric open-phase protector for three-phase motor simultaneously.
Description of drawings
Fig. 1 is a circuit structure schematic diagram of the present invention.Wherein R1, S1, T1, R2, S2, T2, R3, S3, T3, U, V, W are the wire size of the different nodes of three-phase alternating current; N is a zero line; Q01 is a circuit breaker; KM01 is an A.C. contactor; FR01 is a thermal relay; M is a motor; SB01 is a start button; SBS01 is a stop button; K01, K02, K03 are respectively auxiliary relay.
Fig. 2 is a failure indicating circuit schematic diagram of the present invention.Wherein R1, S1, T1 are three-phase inlet wire alternating current; N is a zero line; K01, K02, K03 are respectively auxiliary relay; LD01, LD02, LD3 are indicator light.
Embodiment
Open phase protector of motor connects according to the structure principle chart of accompanying drawing; when three-phase alternating current is normally sent into; the coil of auxiliary relay K01, K02, K03 gets; auxiliary relay K01, K02, K03 often to drive auxiliary contact all closed; contactor KM01 this moment can adhesive; motor M can work, and the normally closed auxiliary contact of auxiliary relay K01, K02, K03 all disconnects, and malfunction indicator lamp LD01, LD02, LD3 all extinguish.
When three-phase alternating current phase shortage (being assumed to be the T1 phase shortage), the coil of auxiliary relay K01, K02 gets at this moment, the coil losing electricity of auxiliary relay K03, the auxiliary contact of often opening of auxiliary relay K03 disconnect, contactor KM01 also can disconnect this moment, and motor M quits work, the normally closed auxiliary contact closure of auxiliary relay K03, this moment, malfunction indicator lamp LD03 lighted, indication T1 phase shortage.
By observing the phase shortage indicator light, can clearly judge fault, the convenient solution protected electric open-phase protector for three-phase motor simultaneously.
Claims (3)
1. an open phase protector of motor comprises three auxiliary relays, indicator light, control circuit; It is characterized in that, the combination of three auxiliary relays in the control circuit, the actuating coil of each auxiliary relay inserts separately on the alternating current of a phase, and the public terminal of three auxiliary relays connects together the back and inserts zero line; The auxiliary contact of often opening of three auxiliary relays are connected respectively and are inserted in the control loop of motor, play the effect of protection motor; The normally closed auxiliary contact of three auxiliary relays connects three indicator lights respectively, is used for phase shortage indication.
2. open phase protector of motor according to claim 1 is characterized in that, a pair of normally opened contact of each auxiliary relay band and a pair of normally-closed contact.
3. open phase protector of motor according to claim 1 and 2 is characterized in that, described failure indicating circuit is that the normally-closed contact by three indicator lights (LD01, LD02, LD03) and three auxiliary relays (K01, K02, K03) is composed in series.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201010237828 CN101888084A (en) | 2010-07-23 | 2010-07-23 | Open phase protector of motor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201010237828 CN101888084A (en) | 2010-07-23 | 2010-07-23 | Open phase protector of motor |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN101888084A true CN101888084A (en) | 2010-11-17 |
Family
ID=43073859
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201010237828 Pending CN101888084A (en) | 2010-07-23 | 2010-07-23 | Open phase protector of motor |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN101888084A (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102684161A (en) * | 2012-05-31 | 2012-09-19 | 襄垣县树元电器有限公司 | Default phase protection device of motor |
| CN105883363A (en) * | 2015-04-23 | 2016-08-24 | 山东华联矿业股份有限公司 | Anti-electric-shock fan starting device |
| CN106129960A (en) * | 2016-08-19 | 2016-11-16 | 宝亨新电气（集团）有限公司 | A kind of electronic power supply open phase protector |
| CN106253212A (en) * | 2016-08-24 | 2016-12-21 | 国网山东省电力公司单县供电公司 | A kind of lack zero, phase shortage, phase sequence mistake power-off protection apparatus |
| CN106329724A (en) * | 2016-08-24 | 2017-01-11 | 国网山东省电力公司单县供电公司 | Control system for remote control of low-voltage circuit breaker |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2069633U (en) * | 1990-05-17 | 1991-01-16 | 马玉忠 | Star-delta automatic switching electricity-saving device for motor starting |
| CN2741257Y (en) * | 2004-07-14 | 2005-11-16 | 中国洛阳浮法玻璃集团有限责任公司 | Double power supply switching controller with phase-off protector |
| CN2741256Y (en) * | 2004-07-14 | 2005-11-16 | 中国洛阳浮法玻璃集团有限责任公司 | Sigle load-double power supply switching controller with phase-off protecter |
| CN101001011A (en) * | 2006-11-14 | 2007-07-18 | 荀海清 | All-line phase-interruption protection switch |
-
2010
- 2010-07-23 CN CN 201010237828 patent/CN101888084A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2069633U (en) * | 1990-05-17 | 1991-01-16 | 马玉忠 | Star-delta automatic switching electricity-saving device for motor starting |
| CN2741257Y (en) * | 2004-07-14 | 2005-11-16 | 中国洛阳浮法玻璃集团有限责任公司 | Double power supply switching controller with phase-off protector |
| CN2741256Y (en) * | 2004-07-14 | 2005-11-16 | 中国洛阳浮法玻璃集团有限责任公司 | Sigle load-double power supply switching controller with phase-off protecter |
| CN101001011A (en) * | 2006-11-14 | 2007-07-18 | 荀海清 | All-line phase-interruption protection switch |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102684161A (en) * | 2012-05-31 | 2012-09-19 | 襄垣县树元电器有限公司 | Default phase protection device of motor |
| CN105883363A (en) * | 2015-04-23 | 2016-08-24 | 山东华联矿业股份有限公司 | Anti-electric-shock fan starting device |
| CN106129960A (en) * | 2016-08-19 | 2016-11-16 | 宝亨新电气（集团）有限公司 | A kind of electronic power supply open phase protector |
| CN106253212A (en) * | 2016-08-24 | 2016-12-21 | 国网山东省电力公司单县供电公司 | A kind of lack zero, phase shortage, phase sequence mistake power-off protection apparatus |
| CN106329724A (en) * | 2016-08-24 | 2017-01-11 | 国网山东省电力公司单县供电公司 | Control system for remote control of low-voltage circuit breaker |
| CN106329724B (en) * | 2016-08-24 | 2017-11-24 | 国网山东省电力公司单县供电公司 | One kind is used for remote control low-voltage circuit breaker control system |
| CN106253212B (en) * | 2016-08-24 | 2018-07-31 | 国网山东省电力公司单县供电公司 | One kind lacking zero, phase shortage, phase sequence mistake power-off protection apparatus |
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Application publication date: 20101117 |