CN204167870U - Open phases of three-phase power source protective circuit - Google Patents
Open phases of three-phase power source protective circuit Download PDFInfo
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- CN204167870U CN204167870U CN201420610096.9U CN201420610096U CN204167870U CN 204167870 U CN204167870 U CN 204167870U CN 201420610096 U CN201420610096 U CN 201420610096U CN 204167870 U CN204167870 U CN 204167870U
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Abstract
The utility model relates to a kind of open phases of three-phase power source protective circuit, comprise the first AC relay J1, second AC relay J2, transformer T and follower, first AC relay J1 is connected in first-phase electricity A1 by primary coil, normally opened contact 4 pin and 6 pin and normally-closed contact 2 pin and 6 pin are connected in third phase electricity C1 respectively, second AC relay J2 is connected in second-phase electricity B1 by primary coil, opening contact 4 pin and 6 pin and normally-closed contact 2 pin and 6 pin is connected in third phase electricity C1 respectively, 6 pin of the first AC relay J1 are connected with 4 pin of the second AC relay J2, first-phase electricity A1 or the second-phase electricity output of B1 are connected with 1 end of the t1 coil of transformer T, 2 ends of the t1 coil of transformer T are connected with the output of third phase electricity C1, t2 coil 3 end of transformer T connects follower.This circuit can Timeliness coverage circuit phase shortage reporting to the police, and prevent power down from endangering, circuit cost is low.
Description
Technical field
The utility model relates to three-phase electricity control technology field, particularly relates to a kind of open phases of three-phase power source protective circuit.
Background technology
For the EPS power supply of three-phase input; when power source loads is threephase load; if EPS power supply itself does not have open-phase protection; so once there is a certain phase power down of three-phase electricity, to load supplying, cause load cisco unity malfunction possibly; even damage the harm such as load; therefore three-phase lack phase testing circuit need be increased, find phase shortage early and send sound and light alarm, avoiding harm to occur.
Utility model content
The utility model, for solving the problem, provides a kind of open phases of three-phase power source protective circuit, finds early and reports to the police, prevent power down from endangering when circuit phase shortage; Utilize common relay forming circuit, cost is low.
For achieving the above object, the technical scheme that the utility model adopts is:
A kind of open phases of three-phase power source protective circuit, it comprises the first AC relay J1, second AC relay J2, transformer T and follower, described first AC relay J1 is connected in first-phase electricity A1 by primary coil, second AC relay J2 is connected in second-phase electricity B1 by primary coil, normally opened contact 4 pin of described first AC relay J1 and 6 pin and normally-closed contact 2 pin and 6 pin are connected in third phase electricity C1 respectively, normally opened contact 4 pin of described second AC relay J2 and 6 pin and normally-closed contact 2 pin and 6 pin are connected in third phase electricity C1 respectively, 6 pin of the first AC relay J1 are connected with 4 pin of the second AC relay J2, described first-phase electricity A1 or the second-phase electricity output of B1 are connected with 1 end of the t1 coil of transformer T, 2 ends of the t1 coil of transformer T are connected with the output of third phase electricity C1, 3 ends of the t2 coil of described transformer T connect described follower, 4 end ground connection.
Being improved to further technique scheme, t1 coil 1, the 2 two ends second capacitor C2 in parallel of described transformer T.
Preferably, described follower comprises the first resistance R1, the second resistance R2, the first electric capacity C1 and operational amplifier U1,1 end of described first resistance R1 connects 3 ends of the t2 coil of described transformer T, 2 ends connect 12 pin of described operational amplifier U1,14 pin of described operational amplifier U1 connect the governor circuit of three phase mains, 1 end of described first electric capacity C1 connects 2 ends of described first resistance R1,2 ends connect 2 ends of the second resistance R2,1 end of the second resistance R2 connects 12 pin of described operational amplifier U1, the 2 end ground connection of the second resistance R2.
Open phases of three-phase power source protective circuit described in the utility model, its beneficial effect is:
Relay is utilized to be connected in three-phase circuit, ingenious its normally opened contact that utilizes forms three-phase electric power open phase testing circuit, and what when phase shortage, main control chip received relay cut-offs signal, judges phase shortage and reports to the police, find phase shortage harm early, prevent power down from endangering and being resolved in time; The common components and parts compositions such as electricity routing relay, cost is low.
Accompanying drawing explanation
Fig. 1 is the relay wiring figure of the utility model open phases of three-phase power source protective circuit;
Fig. 2 is the pile defection control chart of the utility model open phases of three-phase power source protective circuit.
Embodiment
For making the purpose of this utility model, technical scheme and advantage clearly, below in conjunction with accompanying drawing, the utility model is described in further detail.
Embodiment:
With reference to Fig. 1, 2, open phases of three-phase power source protective circuit described in the utility model, comprise relay wiring part and pile defection control section, relay wiring part comprises the first AC relay J1, second AC relay J2, pile defection control section comprises transformer T and follower, follower comprises the first resistance R1, second resistance R2, first electric capacity C1 and operational amplifier U1, first AC relay J1 is connected in first-phase electricity A1 by primary coil, second AC relay J2 is connected in second-phase electricity B1 by primary coil, normally opened contact 4 pin of the first AC relay J1 and 6 pin and normally-closed contact 2 pin and 6 pin are connected in third phase electricity C1 respectively, normally opened contact 4 pin of the second AC relay J2 and 6 pin and normally-closed contact 2 pin and 6 pin are connected in third phase electricity C1 respectively, 6 pin of the first AC relay J1 are connected with 4 pin of the second AC relay J2, first-phase electricity A1 or the second-phase electricity output of B1 are connected with 1 end of the t1 coil of transformer T, 2 ends of the t1 coil of transformer T are connected with the output of third phase electricity C1, 3 ends of the t2 coil of transformer T connect follower, 4 end ground connection.
Wherein, 3 ends of the t2 coil of the 1 end connection transformer T of the first resistance R1 in follower, 12 pin of 2 end concatenation operation amplifier U1,14 pin of operational amplifier U1 connect the governor circuit of three phase mains, 1 end of the first electric capacity C1 connects 2 ends of the first resistance R1,2 ends connect 2 ends of the second resistance R2,12 pin of the 1 end concatenation operation amplifier U1 of the second resistance R2, the 2 end ground connection of the second resistance R2.
T1 coil 1, the 2 two ends second capacitor C2 in parallel of transformer T.
When three-phase electricity is powered normal, first AC relay J1 and the second AC relay J2 closes, normally opened contact 4 pin of the first AC relay J1 and 6 pin are connected, normally opened contact 4 pin of the second AC relay J2 and 6 pin are connected, now civil power sampling electrical network C1 phase 220V voltage just delivers to the t1 coil of transformer T through the contact of the first AC relay J1 and the second AC relay J2, through transformer T 220V voltage step-down to 5V, give operational amplifier U1 again, 14 pin of operational amplifier U1 export 5V voltage signal, a high level signal is produced again through governor circuit process, give main control chip, judge that civil power input is normal.
When three-phase electricity powers phase shortage, such as lack A1 phase, first AC relay J1 disconnects, second AC relay J2 closes, so operational amplifier U1 (14 pin) exports 0V voltage signal, then produces a low level signal through governor circuit process and give main control chip, judges that civil power phase shortage is abnormal, buzzer starts to pipe, and phase shortage indicator light is lighted.
During all the other two-phase phase shortages, operation principle is with A1 phase.
The above is preferred implementation of the present utility model; it should be pointed out that for those skilled in the art, under the prerequisite not departing from the utility model principle; can also make some improvements and modifications, these improvements and modifications are also considered as protection range of the present utility model.
Claims (3)
1. an open phases of three-phase power source protective circuit, it is characterized in that: comprise the first AC relay J1, second AC relay J2, transformer T and follower, described first AC relay J1 is connected in first-phase electricity A1 by primary coil, second AC relay J2 is connected in second-phase electricity B1 by primary coil, normally opened contact 4 pin of described first AC relay J1 and 6 pin and normally-closed contact 2 pin and 6 pin are connected in third phase electricity C1 respectively, normally opened contact 4 pin of described second AC relay J2 and 6 pin and normally-closed contact 2 pin and 6 pin are connected in third phase electricity C1 respectively, 6 pin of the first AC relay J1 are connected with 4 pin of the second AC relay J2, described first-phase electricity A1 or the second-phase electricity output of B1 are connected with 1 end of the t1 coil of transformer T, 2 ends of the t1 coil of transformer T are connected with the output of third phase electricity C1, 3 ends of the t2 coil of described transformer T connect described follower, 4 end ground connection.
2. open phases of three-phase power source protective circuit according to claim 1, is characterized in that: t1 coil 1, the 2 two ends second capacitor C2 in parallel of described transformer T.
3. open phases of three-phase power source protective circuit according to claim 1, it is characterized in that: described follower comprises the first resistance R1, second resistance R2, first electric capacity C1 and operational amplifier U1, 1 end of described first resistance R1 connects 3 ends of the t2 coil of described transformer T, 2 ends connect 12 pin of described operational amplifier U1, 14 pin of described operational amplifier U1 connect the governor circuit of three phase mains, 1 end of described first electric capacity C1 connects 2 ends of described first resistance R1, 2 ends connect 2 ends of the second resistance R2, 1 end of the second resistance R2 connects 12 pin of described operational amplifier U1, the 2 end ground connection of the second resistance R2.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420610096.9U CN204167870U (en) | 2014-10-21 | 2014-10-21 | Open phases of three-phase power source protective circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420610096.9U CN204167870U (en) | 2014-10-21 | 2014-10-21 | Open phases of three-phase power source protective circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN204167870U true CN204167870U (en) | 2015-02-18 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201420610096.9U Active CN204167870U (en) | 2014-10-21 | 2014-10-21 | Open phases of three-phase power source protective circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN204167870U (en) |
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2014
- 2014-10-21 CN CN201420610096.9U patent/CN204167870U/en active Active
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant |