CN2392293Y - Breaker for secondary loss of phase protection - Google Patents
Breaker for secondary loss of phase protection Download PDFInfo
- Publication number
- CN2392293Y CN2392293Y CN 99248295 CN99248295U CN2392293Y CN 2392293 Y CN2392293 Y CN 2392293Y CN 99248295 CN99248295 CN 99248295 CN 99248295 U CN99248295 U CN 99248295U CN 2392293 Y CN2392293 Y CN 2392293Y
- Authority
- CN
- China
- Prior art keywords
- controllable silicon
- rectifier diode
- transformer
- contactor
- relay
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
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- Emergency Protection Circuit Devices (AREA)
Abstract
The utility model relates to a breaker for secondary open-phase protection, which is composed of an AC contactor, an additional control circuit, current transformers, controllable silicon, a transformer, a rectifier diode and a relay, wherein, tbe three current transformers are respectively sheathed between a secondary contactor of the AC contactor and an electric appliance, a secondary winding E of the transformer can be connected in series with the controllable silicon, the rectifier diode and the relay, the controllable silicon and the rectifier diode are connected in parallel on a circuit of each of the controllable silicon, and two connection points on the current transformers are respectively connected with an identical connection point on the parallel circuit. The utility model has wide purpose and is uniformly used by electric appliances which are driven by three phase power supplies (380V). The utility model has the advantages of stable and reliable performance, high sensitivity, and convenient installation, connection, use and maintenance.
Description
The utility model relates to a kind of secondary open-phase protection circuit breaker, when being mainly used in the circuit phase shortage electrical appliance is shielded.
Prior art does not have power-off protection apparatus.Thereby, when phase shortage appears in circuit, cause the accident of burning electrical appliance (motor).
The purpose of this utility model is to fill up the blank of this area and the secondary open-phase protection circuit breaker of a kind of phase shortage outage is provided.
This reality has novel purpose to realize by following measure: the utility model is by A.C. contactor, additional control circuit current transformer, controllable silicon, transformer, rectifier diode and relay are formed, three current transformers are enclosed within A.C. contactor secondary contact respectively between the electrical appliance, transformer secondary winding E is in series with controllable silicon, rectifier diode and relay, be parallel with controllable silicon and rectifier diode on each silicon controlled circuit, two contacts on the current transformer are connected with identical contact on this parallel circuits respectively.
Fig. 1 represents circuit diagram of the present utility model.
The utility model is described in further detail below in conjunction with embodiment and accompanying drawing:
Fig. 1 represents circuit structure of the present utility model, by A.C. contactor, additional control circuit (is seen Fig. 1 right lower quadrant, belong to prior art), current transformer L, controllable silicon T, transformer B, rectifier diode D and relay J constitute, and are set with in existing A.C. contactor or auxiliary relay secondary contact A ', B ', C ' between the electrical appliance (present embodiment is a motor) with three current transformer AL, BL, CL, and the circuit diagram of three current transformer AL, BL, CL is seen the lower-left figure of Fig. 1.The secondary winding E of transformer B is in series with controllable silicon T
4, T
5, T
6, rectifier diode D
4And relay J, leading to controllable silicon T
4Circuit on be parallel with controllable silicon T
1With rectifier diode D
1, current transformer AL 1 with 2 with this parallel circuits on 1 be connected with 2.At T
4After lead to controllable silicon T
5Circuit on be parallel with controllable silicon T
2With rectifier diode D
2, 4 of current transformer BL with 3 with this parallel circuits on 4 be connected with 3.At T
5After lead to controllable silicon T
6Circuit on be parallel with controllable silicon T
3With rectifier diode D
3, 5 of current transformer CL with 6 with this parallel circuits on 5 be connected with 6.On the circuit of relay J, be parallel with filter capacitor C
1
During use, three current transformer AL, BL, CL give controllable silicon T
1, T
2, T
3The control utmost point and anode between add trigger voltage, to trigger the controllable silicon conduction.Utilize secondary winding a, the b of transformer B, the power supply of c again, through rectifier diode D
1, D
2, D
3, give controllable silicon T
4, T
5, T
6The control utmost point and negative electrode between add trigger voltage, to trigger the controllable silicon conducting.Utilize transformer B secondary winding E (power supply is 12V or 24V) again, through rectifier diode D
4With filter capacitor C
1, drive relay J work, make the relay normally open contact closure, thereby realize the work of control A.C. contactor or auxiliary relay, with protection electrical appliance (motor), prevent that it from burning out.
Arbitrary phase in circuit (as the A phase) short of electricity, corresponding A phase current mutual inductor AL does not have voltage, makes A phase controllable silicon T
1Not conducting, then rectifier diode D
1There is not voltage to supply with controllable silicon T
4Control the utmost point and make T
4Be not switched on, like this, transformer B secondary winding E is at A phase T
4The place ends.Though the controllable silicon conducting of two-phase B and C in addition, rectifier diode D
4Do not have voltage, relay J can not be worked, normally opened contact is not closed, makes A.C. contactor or auxiliary relay cisco unity malfunction, and motor quits work, thereby has protected motor to avoid being burnt out.
In addition; transformer B primary winding can also be connected on secondary contact A ', B ', C '; can not connect electrical appliance or contact to the cable two-phase between the motor and two-phase of motor own and contact two-phase; A.C. contactor or auxiliary relay can not be worked, thus the protection electrical appliance.
The utility model contrast prior art has following advantage:
Of many uses, the electrical appliance that every three phase mains (380V) drives all can use; Stable performance and reliable; Spirit The sensitivity height; Installation, connection and easy to use; Easy to maintenance.
Claims (1)
1, a kind of secondary open-phase protection circuit breaker; comprise A.C. contactor and additional control circuit; it is characterized in that; also comprise current transformer, controllable silicon, transformer, rectifier diode and relay; three current transformers are enclosed within A.C. contactor secondary contact respectively between the electrical appliance; transformer secondary winding E is in series with controllable silicon, rectifier diode and relay; be parallel with controllable silicon and rectifier diode on each silicon controlled circuit, two contacts on the current transformer are connected with identical contact on this parallel circuits respectively.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 99248295 CN2392293Y (en) | 1999-10-14 | 1999-10-14 | Breaker for secondary loss of phase protection |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 99248295 CN2392293Y (en) | 1999-10-14 | 1999-10-14 | Breaker for secondary loss of phase protection |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2392293Y true CN2392293Y (en) | 2000-08-16 |
Family
ID=34033519
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 99248295 Expired - Fee Related CN2392293Y (en) | 1999-10-14 | 1999-10-14 | Breaker for secondary loss of phase protection |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2392293Y (en) |
-
1999
- 1999-10-14 CN CN 99248295 patent/CN2392293Y/en not_active Expired - Fee Related
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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 |