CN2392292Y - Phase interruption and electricity leakage protective means for three phase motor - Google Patents
Phase interruption and electricity leakage protective means for three phase motor Download PDFInfo
- Publication number
- CN2392292Y CN2392292Y CN 99245025 CN99245025U CN2392292Y CN 2392292 Y CN2392292 Y CN 2392292Y CN 99245025 CN99245025 CN 99245025 CN 99245025 U CN99245025 U CN 99245025U CN 2392292 Y CN2392292 Y CN 2392292Y
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- China
- Prior art keywords
- circuit
- electrically connected
- phase
- phase motor
- leakage protective
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- 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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Abstract
The utility model relates to a phase interruption and electricity leakage protective means for a three-phase motor, which is composed of a resistance-capacity coupling circuit, an isolation transformer, a rectification circuit and an executive circuit. The input ends of the resistance-capacity coupling circuit are respectively electrically connected with inlet wires of the three-phase motor; the output end is in Y-shaped connection and is electrically connected with the primary end of the isolation transformer. The secondary end of the isolation transformer is electrically connected with the input end of the rectification circuit; the output end of the rectification circuit is electrically connected with the executive circuit. The utility model has the advantages that by adopting the circuit characteristics, when the three-phase motor is in the phase interruption or the electricity leakage condition, the contacts of a relay can act to cut off the inlet wires of the three-phase motor so as to quickly protect the three-phase motor from being burned out.
Description
The utility model relates to a kind of motor protector, relates to a kind of threephase motor phase failure, earth leakage protective device specifically.
The principle that is used for the threephase motor phase failure, earth leakage protective device at present is mainly current mode or temperature control type, and when the threephase motor phase failure, motor will generate heat and cause the temperature control element action, cut off the power supply circuits of threephase motor, burn out to prevent threephase motor.Because described open-phase protector for three phase motor is current mode or temperature control type, causes the operate time of phase failure protector longer, does not have good protective effect, manufacturing cost is higher simultaneously.
The purpose of this utility model just is to provide that a kind of open phase protection is swift in motion, the threephase motor phase failure, earth leakage protective device simple in structure, and also can promptly play a protective role when the threephase motor electric leakage makes motor casing charged.
The purpose of this utility model can realize by following technical measures:
The utility model is made up of resaistance-capacity coupling circuit, isolating transformer, rectification circuit and executive circuit; The input of described resaistance-capacity coupling circuit is electrically connected with the inlet wire of threephase motor respectively, its output is connected into " Y " shape connection and is electrically connected with the primary side of isolating transformer, the secondary end of isolating transformer is electrically connected with the input of rectification circuit, and the output of rectification circuit is electrically connected with executive circuit.
Described rectification circuit is a bridge rectifier, an elementary termination housing of described isolating transformer.
Advantage of the present utility model is formed and is made it simple in structure with regard to being to adopt by resaistance-capacity coupling circuit, isolating transformer, rectification circuit and executive circuit; And because the output of resaistance-capacity coupling circuit is connected into " Y " shape connection and is electrically connected with the primary side of isolating transformer, when the threephase motor operate as normal, the asterism no-voltage of " Y " connection, the isolating transformer no-output, executive circuit is failure to actuate; When the threephase motor phase failure or electric leakage; the asterism of " Y " connection will lose electric equilibrium and produce voltage; voltage of isolating transformer output is added to after rectification on the relay coil in the executive circuit; move and the inlet wire of cut-out threephase motor the contact of relay, thereby reach the purpose that rapid protection threephase motor is not burnt out.
The drawing of accompanying drawing is described as follows:
Fig. 1 is a schematic block circuit diagram of the present utility model.
Fig. 2 is circuit theory diagrams of the present utility model.
Fig. 3 is a profile stereogram of the present utility model.
The utility model describes in further detail below in conjunction with specific embodiment (accompanying drawing):
As shown in the figure, the utility model is made up of resaistance-capacity coupling circuit I, isolating transformer II, rectification circuit III and executive circuit IV; The input of described resaistance-capacity coupling circuit I is electrically connected with A, B, the C three-phase inlet wire of motor respectively, its output is connected into " Y " shape connection and is electrically connected with the elementary end of isolating transformer II, the elementary other end body contact body of isolating transformer II, the secondary end of isolating transformer II is electrically connected with the input of bridge rectifier III, and the output of bridge rectifier III is electrically connected with relay yj coil among the executive circuit IV.
Claims (3)
1, a kind of threephase motor phase failure, earth leakage protective device is characterized in that: it is made up of resaistance-capacity coupling circuit (I), isolating transformer (II), rectification circuit (III) and executive circuit (IV); The input of described resaistance-capacity coupling circuit (I) is electrically connected with the inlet wire of threephase motor respectively, its output is connected into " Y " shape connection and is electrically connected with the primary side of isolating transformer (II), the secondary end of isolating transformer (II) is electrically connected with the input of rectification circuit (III), and the output of rectification circuit (III) is electrically connected with executive circuit (IV).
2, the threephase motor phase failure according to claim 1, earth leakage protective device is characterized in that: described rectification circuit (III) is a bridge rectifier.
3, the threephase motor phase failure according to claim 1, earth leakage protective device is characterized in that: an elementary termination housing of described isolating transformer (II).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 99245025 CN2392292Y (en) | 1999-09-28 | 1999-09-28 | Phase interruption and electricity leakage protective means for three phase motor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 99245025 CN2392292Y (en) | 1999-09-28 | 1999-09-28 | Phase interruption and electricity leakage protective means for three phase motor |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2392292Y true CN2392292Y (en) | 2000-08-16 |
Family
ID=34031010
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 99245025 Expired - Fee Related CN2392292Y (en) | 1999-09-28 | 1999-09-28 | Phase interruption and electricity leakage protective means for three phase motor |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2392292Y (en) |
-
1999
- 1999-09-28 CN CN 99245025 patent/CN2392292Y/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 |