CN2169237Y - Automatic protector for three phase asynchronous motor - Google Patents
Automatic protector for three phase asynchronous motor Download PDFInfo
- Publication number
- CN2169237Y CN2169237Y CN 93239146 CN93239146U CN2169237Y CN 2169237 Y CN2169237 Y CN 2169237Y CN 93239146 CN93239146 CN 93239146 CN 93239146 U CN93239146 U CN 93239146U CN 2169237 Y CN2169237 Y CN 2169237Y
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- CN
- China
- Prior art keywords
- protector
- automatic
- relay
- phase
- circuit
- 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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- Protection Of Generators And Motors (AREA)
Abstract
The utility model relates to an automatic protector for an asynchronous motor, which has the functions of three-phase omnibearing automatic open phase (comprising any damage of elements, the open phase of a power supply, etc.), short circuit voltage shortage, overvoltage, three phase unbalance, etc. The automatic protector is composed of a voltage sampling element, a rectifier, a converting circuit which contains a three-terminal manostat and a switching relay and a driving return circuit which contains the contacts of a switching relay and a driving relay. The protector has complete protective functions and a wide range of application; the power of the automatic protector is 0.5-150 kw. The automatic protector is adapted to motors in various modes of connection; the protector is not connected with a power supply; when the protector works, the electric power consumption of the protector is 1W; the utility model does not have electric power consumption, when a motor stops rotating and working. The utility model has the advantages of simple structure, easy installation, convenient operation, no extra elements and low cost.
Description
A kind of novel threephase asynchronous automatic protector is applicable to the protection of the multiple function of faults such as motor phase shortage, short circuit, under-voltage, overload and three-phase imbalance.
Existing threephase motor electronic type automatic protector or automatic multifunctional protector on the existing market; its principle major part is to make signal with electric current; because the variation of the electric current that difference causes of the size of load current, winding connection pattern differs greatly and adjusts difficulty during fault, is that signal is difficult to protect effectively motor with the electric current therefore.
It is the reliable protection automatically that the protector of signal is realized multiple function with voltage that the purpose of this utility model provides a kind of, and power consumption is few, simple in structure, with low cost, and synchronouss working with motor.
This automatic protector can adopt sampling transformer or auxiliary relay or A.C. contactor by voltage sampling element 1(), bridge heap rectifier 2, change-over circuit 3 and drive widely different road 4 and form.Change-over circuit 3 adopts three terminal regulator (or adopting voltage stabilizing didoe and current-limiting resistance) output input indirect conversion direct current relay.Drive widely different road 4 and establish sampling driving transformer B3 bridge heap rectifier, and seal in one group of normally-closed contact in parallel of switching relay, drive relay ZJ and access current-limiting resistance R and incorporate energy storage delay capacitor C1 into.Drive relay and can adopt thyratron, transistor, field effect transistor etc.Drive the relay closed contact and insert the widely different road of Motor Control to control main widely different road break-make.
Embodiment
Fig. 1 utility model circuit diagram
Voltage sampling transformer 1(B1, B2, B3), pay edge joint bridge heap rectifier 2(QL), 1,2 ends of the direct current crimping three terminal regulator CN7824 of its output (1 is input, and 2 is common port, and 3 is output), 1,3 terminations conversion direct current relay ZJ
A, ZJ
B, ZJ
CCapacitor C
0Doing energy storage filtering uses.Driving widely different road 4 is paid edge joint bridge heap rectifier QL and is connected in series relay ZJ in turn by driving transformer B3
A, ZJ
B, ZJ
COne group of parallel connection, normally-closed contact and drive relay ZJ, and seal in current-limiting resistance R and incorporate energy storage delay capacitor C1 into to guarantee the normal starting of motor at head end.The normally-closed contact that drives relay ZJ seals in the widely different road 5 of Motor Control.
Protector operation principle: when fault occurs; transformer 1 takes out the abnormal failure signal voltage through bridge heap rectifier and becomes direct voltage, at this moment, present between 1,3 ends of three terminal regulator CN7824 differential pressure (superfluous voltage), with it with the normal differential pressure ratio of presetting; be low value, relay ZJ
A, ZJ
B, ZJ
COperating state changes, and drives ZJ in the widely different road 4
A, ZJ
B, ZJ
CThe normally-closed contact closure, (disconnection of normal operating conditions normally-closed contact) drives relay ZJ work, control ZJ normally-closed contact disconnection in the widely different road 5, A.C. contactor C coil losing electricity, the normally opened contact of C disconnects, cuts off motor power in the main circuit, prevent the excessive motor that burns out of electric current, eliminate fault.Sampling and change-over circuit are synchronoused working with motor, and drive circuit is not worked at ordinary times, and moment just works during fault.And automatically reset.
This automatic protector has following advantage: (1) realizes the kinds of protect function; 1. the comprehensive automatic open-phase protection of three-phase: comprise that any former device damages or the power supply phase shortage, no matter be prestart or phase shortage in service, all can be at 0.2 second internal cutting off motor power.2. under-voltage protection: during low pressure 30%, overvoltage protection: during high pressure 15%.3. three-phase imbalance protection: degree of unbalance was greater than action in 35% o'clock.(2) applied widely: as to be applicable to that power is at 0.5kW～150kW motor.Control widely different road voltage and can be 220V or 380V, the motor connected mode can be star, triangle and star one or three conversion hysterias.(3) power consumption is low: protector does not connect power supply, synchronouss working with motor, and power consumption is 1W during work.During the motor stall, the not power consumption of not working.(4) simple in structure, easy to use, do not add components and parts in addition.(5) low, the low price of cost.
Claims (3)
1, a kind of threephase asynchronous automatic protector, have voltage sampling element 1, bridge heap rectifier 2,, it is characterized in that being provided with change-over circuit 3 and drive circuit 4.
2, by the described protector of claim 1, it is characterized in that change-over circuit 3 is provided with three terminal regulator CW7824, its direct-flow input end shunt capacitance Co, the indirect conversion direct current relay ZJ of output, input
A, ZJ
B, ZJ
C
3,, it is characterized in that drive circuit 4 by sampling driving transformer B3, is connected in series switching relay ZJ in the circuit of bridge heap rectifier in turn by the described protector of claim 1
A, ZJ
B, ZJ
COne group of normally-closed contact in parallel, drive relay ZJ, and seal in current-limiting resistance R and incorporate energy storage delay capacitor C1 at head end.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 93239146 CN2169237Y (en) | 1993-08-17 | 1993-08-17 | Automatic protector for three phase asynchronous motor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 93239146 CN2169237Y (en) | 1993-08-17 | 1993-08-17 | Automatic protector for three phase asynchronous motor |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2169237Y true CN2169237Y (en) | 1994-06-15 |
Family
ID=33813734
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 93239146 Expired - Fee Related CN2169237Y (en) | 1993-08-17 | 1993-08-17 | Automatic protector for three phase asynchronous motor |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2169237Y (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100477436C (en) * | 2001-10-12 | 2009-04-08 | 余彦中 | Phase fault, low-voltage and over voltage breaking protection circuit |
-
1993
- 1993-08-17 CN CN 93239146 patent/CN2169237Y/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100477436C (en) * | 2001-10-12 | 2009-04-08 | 余彦中 | Phase fault, low-voltage and over voltage breaking protection circuit |
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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 |