CN201868856U - Integrative protecting device of three-phase alternating current asynchronous motor - Google Patents
Integrative protecting device of three-phase alternating current asynchronous motor Download PDFInfo
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- CN201868856U CN201868856U CN2010206437546U CN201020643754U CN201868856U CN 201868856 U CN201868856 U CN 201868856U CN 2010206437546 U CN2010206437546 U CN 2010206437546U CN 201020643754 U CN201020643754 U CN 201020643754U CN 201868856 U CN201868856 U CN 201868856U
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Abstract
The utility model discloses an integrated protective cabinet of a three-phase alternating current asynchronous motor, which comprises a main control circuit, an open-phase protection circuit and a three-phase current detection circuit, wherein the main control circuit is connected to a power supply line of the three-phase alternating current asynchronous motor in series; the three-phase acquisition signal input end of the open-phase protection circuit is respectively connected with a three-phase power supply line of the three-phase alternating current asynchronous motor; the open-phase protection circuit is in controlling connection with the main control circuit; the three-phase acquisition signal input end of the three-phase current detection circuit is respectively connected with the three-phase power supply line of the three-phase alternating current asynchronous motor; and the control signal output end of the three-phase current detection circuit controls the open-phase protection circuit to be on or off. If the open phase exists, the open-phase protection circuit controls the main control circuit to cut off the power supply to the three-phase alternating current asynchronous motor so as to protect the three-phase alternating current asynchronous motor; and if voltage loss and phase loss exist, the three-phase current detection circuit controls the main circuit to cut off the power supply to the three-phase alternating current asynchronous motor through the open-phase protection circuit so as to protect the three-phase alternating current asynchronous motor.
Description
Technical field:
The utility model relates to the protective device of ac three-phase asynchronous motor, relates in particular to a kind of ac three-phase asynchronous motor comprehensive protector.
Background technology:
Ac three-phase asynchronous motor is because of low price, reliable, be widely used, but at present in the electric wiring of three phase alternating current motor, adopt phase-lacking protective device seldom, this is not because motor does not need open-phase protection, always damages about 60% of motor because the number of motors damaged of phase-deficient operation accounts for a variety of causes, mainly contains following reason: (1) part motor application person is to the harm understanding deficiency of motor phase-deficient operation; (2) selling at exorbitant prices of protective device; (3) protective device faults itself rate height influences motor and normally moves; (4) effect of open-phase protection is unreliable; So reduce the cost of protective device, improve the reliability of its operation and protection, be vital.
The problem of part protective device existence at present:
Some protective devices extract default phase signal with detecting motor input voltage method; but this protection is extremely unreliable; when being in operation generation voltage phase shortage because of motor; motor still has rotating speed output; at this moment; motor is as electronic and phase-splitting generator operation; the electric current formed magnetic field of armature is cut by stator winding in rotary course; in stator winding, produce induced potential; the decompression generating phase of coordinating, on voltage phase shortage end, the value of this electromotive force and phase place are all approaching with this value of power supply; so after the power supply phase shortage; the contactor of this protective device can not discharge, even if certain phase decompression in the phase line of this contactor coil institute cross-over connection, under the effect of motor self power generation phase voltage; this contactor can not discharge yet, thereby causes the motor phase-deficient operation.
Also have the method for some protective devices with detection three phase symmetry load central point change in voltage; extract default phase signal; if delta-connected motor; then on the motor input terminal and connect the electric capacity of 3 star connections; with the same circuit of motor on new produce 1 central point; monitor the variation of this phase point voltage and make the open-phase protection signal; because being in operation, motor takes place to still have rotating speed output after the phase shortage; so the motor decompression becomes the generating phase mutually; therefore the voltage change amount of star connection electric capacity central point is very little; protective device also is failure to actuate, and can cause the motor phase-deficient operation equally.
By above analysis as can be known, extracting signal with detecting voltage method, all is insecure.
The utility model content:
The purpose of this utility model provides a kind of ac three-phase asynchronous motor comprehensive protector; when the arbitrary phase phase shortage of ac three-phase asynchronous motor supply line,, prevent vacant phase starting and phase-deficient operation to the ac three-phase asynchronous motor open-phase protection that cuts off the power supply; simultaneously, also has current sense function.
A kind of ac three-phase asynchronous motor comprehensive protector, wherein: comprise open-phase protection circuit, three-phase current detection circuit, the three-phase acquired signal input of open-phase protection circuit is respectively applied for the three-phase power line that connects ac three-phase asynchronous motor, and the control switch of open-phase protection circuit is used to be serially connected in the supply line of ac three-phase asynchronous motor; The three-phase acquired signal input of three-phase current detection circuit connects the three-phase power line of ac three-phase asynchronous motor respectively, the break-make of the control signal output ends control open-phase protection circuit major loop of three-phase current detection circuit.
Described ac three-phase asynchronous motor comprehensive protector, wherein: described open-phase protection circuit comprises contactor coil, normally closed switch, normal open switch, the 4th relay coil, contactor coil, normally closed switch, be connected the U of ac three-phase asynchronous motor supply line after the normal open switch series connection, between the W phase line, the 4th relay coil is connected the U of ac three-phase asynchronous motor supply line, between the V phase line, the normal opened contact of the 4th relay is serially connected in the U of ac three-phase asynchronous motor supply line, between the W phase line with the coil of contactor, normally closed switch, normal open switch constitutes series circuit; Described three-phase current detection circuit comprises U, V, W phase current detecting unit, the circuit of U, V, W phase current detecting unit is identical, include current transformer, rectifier bridge, relay coil, current transformer is arranged on the corresponding phase line, the output of current transformer connects the input of rectifier bridge, and the output of rectifier bridge connects corresponding relay coil; The series circuit that the normal opened contact of each relay constitutes in U, V, the W phase current detecting unit is attempted by the two ends of normal open switch in the open-phase protection circuit; The three-phase normal opened contact of described contactor is used for being serially connected in respectively the supply line of ac three-phase asynchronous motor.
Described ac three-phase asynchronous motor comprehensive protector; wherein: described ac three-phase asynchronous motor comprehensive protector also comprises the overload protection unit; the overload protection unit comprises thermal relay; the detection part of thermal relay is serially connected on the three-phase power line of ac three-phase asynchronous motor, and the normally closed contact of thermal relay is connected in series mutually with contactor coil in the described open-phase protection circuit.
The utility model will reach following technique effect after adopting technique scheme:
Ac three-phase asynchronous motor comprehensive protector of the present utility model, detect respectively by open-phase protection circuit, three-phase current detection circuit in the supply line of current ac three-phase asynchronous motor whether phase shortage, decompression, the phase failure are arranged, if there is phase shortage, open-phase protection circuit control disconnects the power supply to ac three-phase asynchronous motor, with the protection ac three-phase asynchronous motor; If have decompression, the phase failure, three-phase current detection circuit is protected ac three-phase asynchronous motor by the power supply of open-phase protection circuit control disconnection to ac three-phase asynchronous motor.Further, disconnect supply line when transshipping in supply line, burn out to avoid ac three-phase asynchronous motor by the overload protection unit further.
Description of drawings:
Fig. 1 is the circuit theory diagrams of ac three-phase asynchronous motor comprehensive protector of the present utility model.
Embodiment:
Ac three-phase asynchronous motor comprehensive protector of the present utility model, wherein: comprise main control circuit, open-phase protection circuit, three-phase current detection circuit, main control circuit is serially connected in the supply line of ac three-phase asynchronous motor M, the three-phase acquired signal input of open-phase protection circuit connects the three-phase power line of ac three-phase asynchronous motor M respectively, open-phase protection circuit control connection main control circuit; The three-phase acquired signal input of three-phase current detection circuit connects the three-phase power line of ac three-phase asynchronous motor M respectively, the break-make of the control signal output ends control open-phase protection circuit major loop of three-phase current detection circuit.
As shown in Figure 1: described open-phase protection circuit comprises coil, the first normally closed switch 1SB, the coil of the second normal open switch 2SB, the 4th relay 4KA, power supply indicator D4, divider resistance R1, the 4th capacitor C 4 of contactor KM; Be connected after the coil of contactor KM, the first normally closed switch 1SB, the second normal open switch 2SB series connection between the U, W phase line of ac three-phase asynchronous motor M supply line; Be connected after the coil of the 4th relay 4KA, power supply indicator D4, the divider resistance R1 series connection between the U, V phase line of ac three-phase asynchronous motor M supply line, the 4th capacitor C 4 is attempted by the coil two ends of the 4th relay 4KA.The normal opened contact 4KA1 of the 4th relay 4KA is serially connected between the U, W phase line of ac three-phase asynchronous motor M supply line, and constitutes series circuit with coil, the first normally closed switch 1SB, the second normal open switch 2SB of contactor KM.
Described main control circuit comprises three interlock normal opened contact KM1 of contactor KM, and three interlock normal opened contact KM1 of contactor KM are serially connected in respectively in the supply line of ac three-phase asynchronous motor M.
Described three-phase current detection circuit comprises U, V, W phase current detecting unit, U, V, W phase current detection cell circuit is identical, include current transformer, rectifier bridge, relay coil: U phase current detecting unit comprises U phase current mutual inductor LHu, the 3rd rectifier bridge V3, the 3rd capacitor C 3, the coil of the 3rd relay 3KA, U phase current mutual inductor LHu is arranged on the U phase line of ac three-phase asynchronous motor M supply line, corresponding two input adapters that connect the 3rd rectifier bridge V3 of two out splice going splices of U phase current mutual inductor LHu, the corresponding two ends that connect the 3rd relay 3KA coil of two out splice going splices of the 3rd rectifier bridge V3, the two ends of the 3rd relay 3KA coil are also and be connected to capacitor C 3; V phase current detecting unit comprises the coil of V phase current mutual inductor LHv, the second rectifier bridge V2, second capacitor C 2, the second relay 2KA, V phase current mutual inductor LHv is arranged on the V phase line of ac three-phase asynchronous motor M supply line, corresponding two input adapters that connect the second rectifier bridge V2 of two out splice going splices of V phase current mutual inductor LHv, the corresponding two ends that connect the second relay 2KA coil of two out splice going splices of the second rectifier bridge V2, the two ends of the second relay 2KA coil are also and be connected to capacitor C 2; W phase current detecting unit comprises the coil of W phase current mutual inductor LHw, the first rectifier bridge V1, first capacitor C 1, the first relay 1KA, W phase current mutual inductor LHw is arranged on the W phase line of ac three-phase asynchronous motor M supply line, corresponding two input adapters that connect the first rectifier bridge V1 of two out splice going splices of W phase current mutual inductor LHw, the corresponding two ends that connect the first relay 1KA coil of two out splice going splices of the first rectifier bridge V1, the two ends of the first relay 1KA coil are also and be connected to capacitor C 1.
The series circuit that normal opened contact 1KA1, the 2KA1 of each relay 1KA, 2KA, 3KA, 3KA1 constitute in U, V, the W phase current detecting unit is attempted by the two ends of the second normal open switch 2SB in the open-phase protection circuit.
Described ac three-phase asynchronous motor comprehensive protector also comprises the overload protection unit; the overload protection unit comprises thermal relay FR; the detection part of thermal relay FR is serially connected on the three-phase power line of ac three-phase asynchronous motor M, is connected the U of ac three-phase asynchronous motor M supply line, the contactor KM coil between the W phase line, the first normally closed switch 1SB, the second normal open switch 2SB in the normally closed contact FR-1 of thermal relay FR and the described open-phase protection circuit and constitutes series circuit.
In addition, supply line's power end of ac three-phase asynchronous motor is provided with protector FU and three-phase master switch QS.
Behind closed master switch QS, lack U or W phase as supply voltage, then contactor KM coil can not get electricly in the open-phase protection circuit, and then three of contactor KM interlock normal opened contact KM1 disconnect, and the power supply of ac three-phase asynchronous motor is disconnected; If supply voltage lacks U or V phase time, then the coil of the 4th relay 4KA can not adhesive, and the normal opened contact 4KA1 of the 4th relay 4KA disconnects, and the coil of contactor KM can not get, three interlock normal opened contact KM1 of contactor KM keep disconnecting, and ac three-phase asynchronous motor is power supply not; As above as seen, open-phase protection circuit can play the effect that prevents vacant phase starting.Light-emitting diode D4 in the circuit had both made halfwave rectifier usefulness, played the effect of power supply indication again.
Behind closed master switch QS, if power supply is normal, then the 4th relay 4KA adhesive, closed second often opens button 2SB(second often opens button 2SB for touching the breakaway-element button, when being pressed down, its connection after unclamping, promptly disconnects), contactor KM coil gets, its three interlock normal opened contact KM1 closures, to the motor power supply, the motor operation; The secondary current of each current transformer LHu, the LHv in the described three-phase current detection circuit in U, V, the W phase current detecting unit, LHw output is after corresponding rectifier bridge V1, V2, V3 rectification, promote relay 1KA, 2KA, 3KA respectively, relay 1KA, 2KA, 3KA coil get electric after, often opening node accordingly connects, make the coil of contactor KM keep electricly, motor is normally moved; In the running; if certain phase decompression of supply line or open circuit; then the electric current of this phase current mutual inductor output is zero; relay in the corresponding phase current detecting unit discharges, and the node of often opening of this relay correspondence disconnects the coil losing electricity of contactor KM; contactor KM discharges; its three interlock normal opened contact KM1 disconnect, and the three-phase power line of motor all disconnects, and motor is shielded.
After reaching certain value and certain hour as motor overload, the normally open contact FR1 of thermal relay FR disconnects, and the coil losing electricity of contactor KM shields to motor equally.
In the U of three-phase current detection circuit, V, the W phase current detecting unit, when motor normally moves, the electric current of each current transformer output is after corresponding rectifier bridge rectification, corresponding capacitance filtering, electric current by corresponding relay coil, be slightly larger than its minimum holding current, can guarantee that the reliable adhesive of relay gets final product; Excessive or too small as the relay coil electric current, can select the current transformer of different pieces of information for use, or in the relay coil circuit, seal in resistance, or change the number of turn of current transformer primary connection, all can carry out the adjustment of secondary current; To test out the minimum operate current of relay before the debugging, so as when to debug and its operating current compare; It is 3 ~ 5A/700V that rectifier bridge V1 ~ V3 adopts parameter.
In the open-phase protection circuit, the coil current of relay 4KA also should only be slightly larger than its minimum operate current, and the excessive then resistance R 1 meeting temperature rise of electric current is too high, and the power of R1 is 4 ~ 5W.
The utility model comprehensive protector extracts guard signal with the method that detects load current; no matter be the supply voltage phase shortage; still contactor KM contact loose contact; as long as the relay in open-phase protection circuit or the three-phase current detection circuit discharges, contactor KM is discharged play a protective role.The utility model further also has overload protection function.
Claims (3)
1. ac three-phase asynchronous motor comprehensive protector, it is characterized in that: comprise open-phase protection circuit, three-phase current detection circuit, the three-phase acquired signal input of open-phase protection circuit is respectively applied for the three-phase power line that connects ac three-phase asynchronous motor, and the control switch of open-phase protection circuit is used to be serially connected in the supply line of ac three-phase asynchronous motor; The three-phase acquired signal input of three-phase current detection circuit connects the three-phase power line of ac three-phase asynchronous motor respectively, the break-make of the control signal output ends control open-phase protection circuit major loop of three-phase current detection circuit.
2. ac three-phase asynchronous motor comprehensive protector as claimed in claim 1, it is characterized in that: described open-phase protection circuit comprises contactor coil, normally closed switch, normal open switch, the 4th relay coil, contactor coil, normally closed switch, be connected the U of ac three-phase asynchronous motor supply line after the normal open switch series connection, between the W phase line, the 4th relay coil is connected the U of ac three-phase asynchronous motor supply line, between the V phase line, the normal opened contact of the 4th relay is serially connected in the U of ac three-phase asynchronous motor supply line, between the W phase line with the coil of contactor, normally closed switch, normal open switch constitutes series circuit; Described three-phase current detection circuit comprises U, V, W phase current detecting unit, the circuit of U, V, W phase current detecting unit is identical, include current transformer, rectifier bridge, relay coil, current transformer is arranged on the corresponding phase line, the output of current transformer connects the input of rectifier bridge, and the output of rectifier bridge connects corresponding relay coil; The series circuit that the normal opened contact of each relay constitutes in U, V, the W phase current detecting unit is attempted by the two ends of normal open switch in the open-phase protection circuit; The three-phase normal opened contact of described contactor is used for being serially connected in respectively the supply line of ac three-phase asynchronous motor.
3. ac three-phase asynchronous motor comprehensive protector as claimed in claim 1 or 2; it is characterized in that: described ac three-phase asynchronous motor comprehensive protector also comprises the overload protection unit; the overload protection unit comprises thermal relay; the detection part of thermal relay is serially connected on the three-phase power line of ac three-phase asynchronous motor, and the normally closed contact of thermal relay is connected in series mutually with contactor coil in the described open-phase protection circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010206437546U CN201868856U (en) | 2010-12-07 | 2010-12-07 | Integrative protecting device of three-phase alternating current asynchronous motor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010206437546U CN201868856U (en) | 2010-12-07 | 2010-12-07 | Integrative protecting device of three-phase alternating current asynchronous motor |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201868856U true CN201868856U (en) | 2011-06-15 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2010206437546U Expired - Fee Related CN201868856U (en) | 2010-12-07 | 2010-12-07 | Integrative protecting device of three-phase alternating current asynchronous motor |
Country Status (1)
| Country | Link |
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| CN (1) | CN201868856U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102035180A (en) * | 2010-12-07 | 2011-04-27 | 河南省电力公司许昌供电公司 | Comprehensive protection device for three-phase alternating current asynchronous motor |
| 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 |
-
2010
- 2010-12-07 CN CN2010206437546U patent/CN201868856U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102035180A (en) * | 2010-12-07 | 2011-04-27 | 河南省电力公司许昌供电公司 | Comprehensive protection device for three-phase alternating current asynchronous motor |
| 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 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C41 | Transfer of patent application or patent right or utility model | ||
| C56 | Change in the name or address of the patentee | ||
| CP01 | Change in the name or title of a patent holder |
Address after: No. 288 Xuchang City, Henan province 461000 City Road Patentee after: XUCHANG POWER SUPPLY COMPANY OF STATE GRID HENAN ELECTRIC POWER Co. Address before: No. 288 Xuchang City, Henan province 461000 City Road Patentee before: Xuchang Power Supply Company of Henan Electric Power Co. |
|
| TR01 | Transfer of patent right |
Effective date of registration: 20131203 Address after: 100031 Xicheng District West Chang'an Avenue, No. 86, Beijing Patentee after: State Grid Corporation of China Patentee after: XUCHANG POWER SUPPLY COMPANY OF STATE GRID HENAN ELECTRIC POWER Co. Address before: No. 288 Xuchang City, Henan province 461000 City Road Patentee before: XUCHANG POWER SUPPLY COMPANY OF STATE GRID HENAN ELECTRIC POWER Co. |
|
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20110615 Termination date: 20181207 |