CN102868329B - Medium-voltage motor soft start device in water chilling unit - Google Patents
Medium-voltage motor soft start device in water chilling unit Download PDFInfo
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- CN102868329B CN102868329B CN201210338035.7A CN201210338035A CN102868329B CN 102868329 B CN102868329 B CN 102868329B CN 201210338035 A CN201210338035 A CN 201210338035A CN 102868329 B CN102868329 B CN 102868329B
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Abstract
The invention relates to a medium-voltage motor soft start device in a water chilling unit, belonging to the technical field of starting cabinets of water chilling units of central air-conditioners. The medium-voltage motor soft start device comprises a power conversion protection circuit, a current and voltage monitoring circuit, an executing circuit and a control circuit, wherein the control circuit is connected with the power conversion protection circuit, the current and voltage monitoring circuit and the executing circuit; the current and voltage monitoring circuit is connected with the power conversion protection circuit; the power conversion protection circuit is externally connected with a power input wire; and the executing circuit is externally connected with a motor M. The medium-voltage motor soft start device has the advantage of reducing the impact of the current generated when the motor M is started on a power grid; and meanwhile, a microcontroller U can be used for sampling voltage, current and leakage current of the circuit and providing detection protection for voltage, current and leakage current faults of the motor M, therefore starting protection and using safety of the motor M are achieved.
Description
Technical field
the invention belongs to central air-conditioning handpiece Water Chilling Units and start cabinet technical field, be specifically related to a kind of Medium-voltage motor soft starting device of handpiece Water Chilling Units.
Background technology
large-scale air conditioner cold water unit generally adopts Medium-voltage motor (3-10KV) as power, motor often needs higher voltage and is greater than the starting current of several times of rated current in the time starting, traditional practice is series reactor in the major loop of motor, voltage while startup to reduce, or adopt self coupling to become the mode reduced-voltage starting of power supply, after startup, excise respectively again reactor and self coupling and become.These two kinds of Starting mode have following deficiency: putting into operation and excising is all impact, can cause very large humorous wave impact to Medium-voltage motor, easily cause electrical fault, also can pollute to electrical network; High-tension apparatus is many, and reliability is low, poor stability, and cost of investment is higher; Equipment interoperability is poor, starts dumb.
in view of this, be necessary the Medium-voltage motor starting drive of existing handpiece Water Chilling Units to be improved, technical scheme described below produces under this background.
Summary of the invention
the object of the present invention is to provide a kind of high-power, startup ability is strong, reliability is high, highly versatile, cost is low, fail safe good, noise is low, take up an area less, adopt the Medium-voltage motor soft starting device of handpiece Water Chilling Units of low voltage control.
the object of the invention is to reach like this; a kind of Medium-voltage motor soft starting device of handpiece Water Chilling Units; comprise power supply translation and protection circuit, current/voltage observation circuit, executive circuit and control circuit; control circuit is connected with power supply translation and protection circuit, current/voltage observation circuit and executive circuit; current/voltage observation circuit is connected with power supply translation and protection circuit; power supply translation and protection circuit external power supply inlet wire, the external motor M of executive circuit.
in a specific embodiment of the present invention, described power supply translation and protection circuit comprises high voltage load switch QS, fuse FU1～FU3, transformer CPT and control protection switch CB1, CB2, three inputs of high voltage load switch QS and electric power incoming line L1, L2, L3 connects, one former limit P1 of the Current Transmit 1 in one end and the current/voltage observation circuit of the first output termination fuse FU1 of high voltage load switch QS, one former limit P1 of the Current Transmit 2 in one end and the current detection circuit of the second output termination fuse FU2 of high voltage load switch QS, one former limit P1 of the Current Transmit 3 in one end and the current detection circuit of the 3rd output termination fuse FU3 of high voltage load switch QS, the A end of the voltage transformer pt 1 in A end and the current/voltage observation circuit of another termination transformer CPT of fuse FU1, the A end of the voltage transformer pt 2 in the other end and the current/voltage observation circuit of the X termination fuse FU3 of transformer CPT, an input of an input of a termination control protection switch CB1 of transformer CPT and control protection switch CB2, control an output termination wire K11 of protection switch CB1, control another output termination wire K12 of protection switch CB1, one end of normally opened contact of scram button STB and one end of the normally opened contact of relay CR1 in an output and the control circuit of control protection switch CB2 meet wire K13 jointly, one end of controlling another output of protection switch CB2 and the shunt opening coil F of high voltage load switch QS meets wire K14 jointly, wire K11～K14 is connected with control circuit, the other end of the shunt opening coil F of high voltage load switch QS is connected with the other end of the other end of the normally opened contact of the scram button STB in control circuit and the normally opened contact of relay CR1, the other end of fuse FU2 is connected with the B end of the voltage transformer pt 1 in current/voltage observation circuit and the B end of voltage transformer pt 2, control another input of protection switch CB1, control another input of protection switch CB2 and the x of transformer CPT end common ground.
in another specific embodiment of the present invention, described current/voltage observation circuit comprises Current Transmit 1～CT3, voltage transformer pt 1, PT2 and control protection switch CB3, two secondary S1 of Current Transmit 1, 1 of the J4 part of microcontroller U in control circuit described in S2 connects respectively, 2 pin, one former limit P1 of Current Transmit 1 is connected with the first output of high voltage load switch QS and one end of fuse FU1 in described power supply translation and protection circuit, first one end of often opening main contacts of vacuum circuit-breaker QF1 in another former limit P2 connection control circuit of Current Transmit 1, two secondary S1 of Current Transmit 2, 3 of the J4 part of microcontroller U in S2 difference connection control circuit, 4 pin, one former limit P1 of Current Transmit 2 is connected with the second output of high voltage load switch QS and the one end of fuse FU2 in power supply translation and protection circuit, second one end of often opening main contacts of vacuum circuit-breaker QF1 in another former limit P2 connection control circuit of Current Transmit 2, two secondary S1 of Current Transmit 3, 5 of the J4 part of microcontroller U in S2 difference connection control circuit, 6 pin, one former limit P1 of Current Transmit 3 is connected with the 3rd output of the high voltage load switch QS in power supply translation and protection circuit and one end of fuse FU3, the 3rd one end of often opening main contacts of vacuum circuit-breaker QF1 in another former limit P2 connection control circuit of Current Transmit 3, the first input end of a termination control protection switch CB3 of voltage transformer pt 1, the 3rd input of a termination control protection switch CB3 of voltage transformer pt 2, three outputs of controlling protection switch CB3 respectively with control circuit in the L1 of J3 part of microcontroller U, L2, L3 pin connects, the b end of voltage transformer pt 1, the second input common ground of the b end of voltage transformer pt 2 and control protection switch CB3.
in another specific embodiment of the present invention, described executive circuit comprises starting transformer TQ, soft initiator Z and residual current transformer GFCT, the on high-tension side X end of starting transformer TQ often opens the other end of main contacts with first of vacuum circuit-breaker QF1 in described control circuit 4 and first one end of often opening main contacts of vacuum circuit-breaker QF2 is connected, the on high-tension side Y end of starting transformer TQ often opens the other end of main contacts with second of the vacuum circuit-breaker QF1 in control circuit and second one end of often opening main contacts of vacuum circuit-breaker QF2 is connected, the on high-tension side Z end of starting transformer TQ often opens the other end of main contacts with the 3rd of the vacuum circuit-breaker QF1 in control circuit and the 3rd one end of often opening main contacts of vacuum circuit-breaker QF2 is connected, first other end of often opening main contacts of vacuum circuit-breaker QF2 on high-tension side A end and the control circuit of starting transformer TQ meets wire K1 jointly, wire K1 is through the outlet terminal T1 that connects motor M after residual current transformer GFCT, second other end of often opening main contacts of vacuum circuit-breaker QF2 on high-tension side B end and the control circuit of starting transformer TQ meets wire K2 jointly, wire K2 is through the outlet terminal T2 that connects motor M after residual current transformer GFCT, the 3rd other end of often opening main contacts of vacuum circuit-breaker QF2 on high-tension side C end and the control circuit of starting transformer TQ meets wire K3 jointly, wire K3 is through the outlet terminal T3 that connects motor M after residual current transformer GFCT, 1 of the J5 part of microcontroller U in the secondary D connection control circuit of residual current transformer GFCT, 2 pin, the a end of the low-pressure side of starting transformer TQ, b end, c end is held with the L1 of soft starter Z respectively, L2 end, L3 holds connection, the T1 end of soft starter Z and T2 end, T3 holds connection, the x end of the low-pressure side of starting transformer TQ and y end, z holds connection.
in another specific embodiment of the present invention, described control circuit comprises microcontroller U, scram button STB, contactor KA1, KA2, time relay KT, relay CR1, PR1 and vacuum circuit-breaker QF1, QF2, 1 pin of the J1 part of microcontroller U and 1 pin of J9 part, 5 pin, 15 pin meet wire K13 jointly, 2 pin of the J1 part of microcontroller U, one end of the coil of one end of the coil of relay PR1 and relay CR1 meets wire K14 jointly, 2 pin of the J9 part of another termination microcontroller U of the coil of relay PR1, 6 pin of the J9 part of another termination microcontroller U of the coil of relay CR1, 35 pin of the secondary line socket of one end of the normally-closed contact of scram button STB and vacuum circuit-breaker QF1, one end of the normally-closed contact of contactor KA1, one end of 35 pin of the secondary line socket of vacuum circuit-breaker QF2 and the normally-closed contact of contactor KA2 meets wire K11 jointly, one end of the normally opened contact of the other end of the normally-closed contact of scram button STB and relay PR1, second one end of often driving auxiliary contact of vacuum circuit-breaker QF1, one end of the normally opened contact of time relay KT, one end of one end of the second normally opened contact of contactor KA1 and the second normally opened contact of contactor KA2 connects, one end of the first normally-closed contact of another termination time relay KT of the normally opened contact of relay PR1, the other end of the first normally-closed contact of time relay KT is connected with one end of one end of the first normally closed auxiliary contact of vacuum circuit-breaker QF2 and the first normally opened contact of contactor KA1, the other end of the first normally closed auxiliary contact of vacuum circuit-breaker QF2 is connected with one end of the other end of the first normally opened contact of contactor KA1 and the coil of contactor KA1, one end of the coil of the other end of the coil of contactor KA1 and contactor KA2, one end of the coil of time relay KT, 25 pin of the secondary line socket of vacuum circuit-breaker QF1, 4 pin, 25 pin of the secondary line socket of 31 pin and vacuum circuit-breaker QF2, 4 pin, 31 pin meet wire K12 jointly, second of vacuum circuit-breaker QF1 often leaves the R30 pin of the soft initiator Z in the other end and the executive circuit of auxiliary contact, one end of one end of the first normally opened contact of contactor KA2 and the second normally closed auxiliary contact of vacuum circuit-breaker QF2 connects, the other end of the first normally opened contact of contactor KA2 is connected with the other end of the R3M pin of the soft initiator Z in executive circuit and the coil of contactor KA2, the other end of the second normally closed auxiliary contact of vacuum circuit-breaker QF2 is connected with one end of the second normally-closed contact of time relay KT, the other end of another termination normally opened contact of the second normally-closed contact of time relay KT and the other end of coil, 14 pin of the secondary line socket of another termination vacuum circuit-breaker QF1 of the second normally opened contact of contactor KA1, 30 pin of the secondary line socket of vacuum circuit-breaker QF1 connect the other end of the normally-closed contact of contactor KA1, 14 pin of the secondary line socket of another termination vacuum circuit-breaker QF2 of the second normally opened contact of contactor KA2, 30 pin of the secondary line socket of vacuum circuit-breaker QF2 connect the other end of the normally-closed contact of contactor KA2, first of vacuum circuit-breaker QF1 often leaves 9 pin of the J2 part of a termination microcontroller U of auxiliary contact, first of vacuum circuit-breaker QF1 often leaves 10 pin of the J2 part of another termination microcontroller U of auxiliary contact, first of vacuum circuit-breaker QF2 often leaves 11 pin of the J2 part of a termination microcontroller U of auxiliary contact, first of vacuum circuit-breaker QF2 often leaves 12 pin of the J2 part of another termination microcontroller U of auxiliary contact, 1 pin of the J2 part of microcontroller U is connected with 2 pin, 7 pin are connected with 8 pin, the external motor start stop signal of 5 pin and 6 pin, the external alarm signal of 16 pin of the J9 part of microcontroller U, the J3 part of microcontroller U is connected with described current/voltage observation circuit 2 with J4 part, first one end of often opening main contacts of vacuum circuit-breaker QF1, one end that main contacts is often opened in second one end and the 3rd of often opening main contacts respectively with current/voltage observation circuit in another former limit P2 of Current Transmit 1, another former limit P2 of another former limit P2 of Current Transmit 2 and Current Transmit 3 connects, first of vacuum circuit-breaker QF1 often leaves the on high-tension side X end that the other end of main contacts and first one end of often opening main contacts of vacuum circuit-breaker QF2 are connected and are connected to the starting transformer TQ in described executive circuit, second of vacuum circuit-breaker QF1 often leaves the on high-tension side Y end that the other end of main contacts and second one end of often opening main contacts of vacuum circuit-breaker QF2 are connected and are connected to the starting transformer TQ in described executive circuit, the 3rd of vacuum circuit-breaker QF1 often leaves the on high-tension side Z end that the other end of main contacts and the 3rd one end of often opening main contacts of vacuum circuit-breaker QF2 are connected and are connected to the starting transformer TQ in described executive circuit, first of vacuum circuit-breaker QF2 often leaves the other end of main contacts, the other end that second other end and the 3rd of often opening main contacts is often opened main contacts respectively with executive circuit in the on high-tension side A end of starting transformer TQ, B end, C holds connection, described control circuit is connected with described power supply translation and protection circuit 1 by wire K11～K14.
the present invention, owing to having adopted said structure, taking microcontroller U as core devices, controls starting transformer TQ and soft starter Z and is used in conjunction with, and realizes the soft start of motor M, has reduced the impact of the Current on Grid producing when motor M starts; Meanwhile, microcontroller U can also sample to the voltage of circuit, electric current and leakage current, motor M is provided to the detection protection of voltage, electric current and leakage current fault, thereby has realized starting protection and the safe handling of motor M.
Brief description of the drawings
fig. 1 is theory diagram of the present invention.
fig. 2 is the electrical connection graph of power supply translation and protection circuit of the present invention, current/voltage observation circuit and control circuit.
fig. 3 is the electrical schematic diagram of executive circuit of the present invention.
Embodiment
in order to make the public can fully understand technical spirit of the present invention and beneficial effect; applicant will describe in detail the specific embodiment of the present invention below by reference to the accompanying drawings; but applicant is not the restriction to technical scheme to the description of embodiment, anyly changes in the form rather than substance and all should be considered as protection scope of the present invention according to the present invention design.
refer to Fig. 1; a kind of Medium-voltage motor soft starting device of handpiece Water Chilling Units; comprise power supply translation and protection circuit 1, current/voltage observation circuit 2, executive circuit 3 and control circuit 4; control circuit 4 is connected with power supply translation and protection circuit 1, current/voltage observation circuit 2 and executive circuit 3; current/voltage observation circuit 2 is connected with power supply translation and protection circuit 1; power supply translation and protection circuit 1 external power supply inlet wire, the external motor M of executive circuit 3.
refer to Fig. 2; described power supply translation and protection circuit 1 comprises high voltage load switch QS, fuse FU1～FU3, transformer CPT and controls protection switch CB1, CB2; three inputs of high voltage load switch QS are connected with electric power incoming line L1, L2, L3; in the present embodiment; described high voltage load switch QS adopts FN12-12RD/630-31.5, and transformer CPT adopts DG-3/10.Described current/voltage observation circuit 2 comprises Current Transmit 1～CT3, voltage transformer pt 1, PT2 and control protection switch CB3; in the present embodiment; described Current Transmit 1～CT3 adopts LFZJ-10Q, and voltage transformer pt 1, PT2 adopt JDZ-10.Described executive circuit 3 comprises starting transformer TQ, soft initiator Z and residual current transformer GFCT, in the present embodiment, described starting transformer TQ adopts SCB-Q-2770/10, is lever transformer, soft starter Z is ATS48M10Q, and residual current transformer GFCT adopts LJZ-10.Described executive circuit 3 is realized and being connected of three outlet terminal T1, T2 of motor M, T3 by wire K1, K2, K3.Described control circuit 4 comprises microcontroller U, scram button STB, contactor KA1, KA2, time relay KT, relay CR1, PR1 and vacuum circuit-breaker QF1, QF2, in the present embodiment, described microcontroller U is the core of design, the ISM that adopts U.S.'s Carrier, vacuum circuit-breaker QF1, QF2 adopt VS1-12/630-25.5.
below, again in conjunction with Fig. 2, operation principle of the present invention is described.Outside start stop signal accesses this starting drive via 5,6 pin of the J2 part of the microcontroller U in control circuit 4, in the time that microcontroller U receives enabling signal, 2 pin output enabling signals of the J9 part of microcontroller U, relay PR1 coil obtains electric, the normally opened contact closure of relay PR1, contactor KA1 coil obtains electric, vacuum circuit-breaker QF1 must conduct, often open main contacts closure for its three, the on high-tension side X end of the starting transformer TQ in executive circuit 3, Y end, Z end are communicated with control circuit 4.Now, the on high-tension side three-winding of starting transformer TQ is connected with the three-phase winding of motor M respectively, because the on high-tension side coil impedance of starting transformer TQ is far longer than the winding impedance of motor M, therefore three-phase voltage all imposes on the on high-tension side coil of starting transformer TQ, the low-pressure side of starting transformer TQ produces induced voltage, soft starter Z obtains electric startup, the low-pressure side voltage drop of starting transformer TQ.Correspondingly, the high side voltage of starting transformer TQ and then declines, and the voltage of motor M rises, and realizes soft start.In the time that motor M obtains whole three-phase voltages, soft start completes.The R30 pin of soft starter Z and R3M pin closure, the coil of contactor KA2 obtains electric, and vacuum circuit-breaker QF2 conducting is often left main contacts closure for three of vacuum circuit-breaker QF2, and starting transformer TQ is by short circuit, and motor M starts total head operation.
in addition, the J3 of the microcontroller U in control circuit 4 part is carried out voltage signal sampling, provides phase shortage, anti-phase, overvoltage, under voltage to detect to motor M; J4 part is carried out the sampling of current signal, provides overload, stall, mutually unbalanced detection to motor M; In addition, microcontroller U also can carry out zero-sequence current sampling by J5 part, and motor M is carried out to detection of electrical leakage.Example, in the time of motor M generation stall, 2 pin no signal outputs of the J9 part of microcontroller U, by 6 pin output signals of J9 part, the coil of relay CR1 obtains electric, normally opened contact closure, the shunt opening coil F of high voltage load switch QS obtains electric dropout, electric power incoming line is disconnected, and motor M shuts down, simultaneously 16 pin output alarm signals of the J9 of microcontroller U part.When other voltages beyond the motor M generation stall, current failure, 2 pin no-outputs of the J9 part of microcontroller U, motor M stops, simultaneously 16 pin output alarm signals of the J9 of microcontroller U part.Described microcontroller U can also provide by 9,10,11,12 pin of J2 part the starting protection of motor M.If motor M does not normally start, 9 pin, 10 pin of the J2 part of microcontroller U disconnect, 2 pin no-outputs of the J9 part of microcontroller U, and motor M stops, simultaneously 16 pin output alarm signals of the J9 of microcontroller U part; If motor M is not total head operation, 11 pin, 12 pin of the J2 part of microcontroller U disconnect, 2 pin no-outputs of the J9 part of microcontroller U, and motor M stops, simultaneously 16 pin output alarm signals of the J9 of microcontroller U part.In addition, if there is emergency, can make the shunt opening coil F of high voltage load switch QS obtain electric dropout, deenergization inlet wire by the normally opened contact of closed scram button STB; Or disconnect the normally-closed contact of scram button STB, and making the coil losing electricity of contactor KA1, motor M is out of service.
Claims (1)
1.
a kind of Medium-voltage motor soft starting device of handpiece Water Chilling Units, it is characterized in that comprising power supply translation and protection circuit (1), current/voltage observation circuit (2), executive circuit (3) and control circuit (4), control circuit (4) and power supply translation and protection circuit (1), current/voltage observation circuit (2) is connected with executive circuit (3), current/voltage observation circuit (2) is connected with power supply translation and protection circuit (1), power supply translation and protection circuit (1) external power supply inlet wire, the external motor M of executive circuit (3), described power supply translation and protection circuit (1) comprises high voltage load switch QS, fuse FU1～FU3, transformer CPT and control protection switch CB1, CB2, three inputs of high voltage load switch QS and electric power incoming line L1, L2, L3 connects, one former limit P1 of the Current Transmit 1 in one end and the current/voltage observation circuit (2) of the first output termination fuse FU1 of high voltage load switch QS, one former limit P1 of the Current Transmit 2 in one end and the current/voltage observation circuit (2) of the second output termination fuse FU2 of high voltage load switch QS, one former limit P1 of the Current Transmit 3 in one end and the current/voltage observation circuit (2) of the 3rd output termination fuse FU3 of high voltage load switch QS, the A end of the voltage transformer pt 1 in A end and the current/voltage observation circuit (2) of another termination transformer CPT of fuse FU1, the A end of the voltage transformer pt 2 in the other end and the current/voltage observation circuit (2) of the X termination fuse FU3 of transformer CPT, an input of an input of a termination control protection switch CB1 of transformer CPT and control protection switch CB2, control an output termination wire K11 of protection switch CB1, control another output termination wire K12 of protection switch CB1, one end of normally opened contact of scram button STB and one end of the normally opened contact of relay CR1 in an output and the control circuit (4) of control protection switch CB2 meet wire K13 jointly, one end of controlling another output of protection switch CB2 and the shunt opening coil F of high voltage load switch QS meets wire K14 jointly, wire K11～K14 is connected with control circuit (4), the other end of the shunt opening coil F of high voltage load switch QS is connected with the other end of normally opened contact of the scram button STB in control circuit (4) and the other end of the normally opened contact of relay CR1, the other end of fuse FU2 is connected with the B end of the voltage transformer pt 1 in current/voltage observation circuit (2) and the B end of voltage transformer pt 2, control another input of protection switch CB1, control another input of protection switch CB2 and the x of transformer CPT end common ground, described executive circuit (3) comprises starting transformer TQ, soft initiator Z and residual current transformer GFCT.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210338035.7A CN102868329B (en) | 2012-09-13 | 2012-09-13 | Medium-voltage motor soft start device in water chilling unit |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210338035.7A CN102868329B (en) | 2012-09-13 | 2012-09-13 | Medium-voltage motor soft start device in water chilling unit |
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| CN102868329A CN102868329A (en) | 2013-01-09 |
| CN102868329B true CN102868329B (en) | 2014-10-29 |
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| CN201210338035.7A Active CN102868329B (en) | 2012-09-13 | 2012-09-13 | Medium-voltage motor soft start device in water chilling unit |
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| CN111536727B (en) * | 2020-06-11 | 2023-12-26 | 淮南矿业(集团)有限责任公司 | Safety protection circuit of mine cooling system and control method |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1764056A (en) * | 2004-10-19 | 2006-04-26 | 湖北追日电气设备有限公司 | High-voltage motor reduction voltage soft-start device |
| CN101394143A (en) * | 2008-10-17 | 2009-03-25 | 常熟市森原电器厂 | Soft starting device for large power high voltage motor |
| CN202282754U (en) * | 2011-10-22 | 2012-06-20 | 无锡军工智能电气股份有限公司 | High-voltage motor soft starting device implemented by finished low-voltage motor soft starter |
| CN202772820U (en) * | 2012-09-13 | 2013-03-06 | 常熟市森源电气科技有限公司 | Medium voltage motor soft start device of cold water set |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20040184208A1 (en) * | 2003-03-19 | 2004-09-23 | Daniel Liu | Power protecting device for electrical power source and load |
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- 2012-09-13 CN CN201210338035.7A patent/CN102868329B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1764056A (en) * | 2004-10-19 | 2006-04-26 | 湖北追日电气设备有限公司 | High-voltage motor reduction voltage soft-start device |
| CN101394143A (en) * | 2008-10-17 | 2009-03-25 | 常熟市森原电器厂 | Soft starting device for large power high voltage motor |
| CN202282754U (en) * | 2011-10-22 | 2012-06-20 | 无锡军工智能电气股份有限公司 | High-voltage motor soft starting device implemented by finished low-voltage motor soft starter |
| CN202772820U (en) * | 2012-09-13 | 2013-03-06 | 常熟市森源电气科技有限公司 | Medium voltage motor soft start device of cold water set |
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