CN205490284U - Controlling means based on high -power asynchronous motor frequency conversion and soft start - Google Patents
Controlling means based on high -power asynchronous motor frequency conversion and soft start Download PDFInfo
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- CN205490284U CN205490284U CN201520778369.5U CN201520778369U CN205490284U CN 205490284 U CN205490284 U CN 205490284U CN 201520778369 U CN201520778369 U CN 201520778369U CN 205490284 U CN205490284 U CN 205490284U
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Abstract
The utility model relates to a controlling means based on high -power asynchronous motor frequency conversion and soft start, including asynchronous motor feed cabinet, the output of asynchronous motor feed cabinet is through the soft input of selecting the cabinet that opens of cable junction frequency conversion, and the main terminal box that the output of selecting the cabinet passes through cable junction asynchronous motor is opened in soft of frequency conversion, and the frequency conversion is soft opens and select the cabinet to pass through the cable to connect converter cabinet and soft start cabinet respectively, and the input of a cable junction star cabinet is passed through to asynchronous motor's vice terminal box. Adopt converter control power more than or equal to 2000kW's 6kV or 10kV asynchronous motor can save the electric energy during normal operating, adopt soft starter to start asynchronous motor when converter trouble or maintenance and reduced the impact of motor pick -up current to the electric wire netting, withdraw from the operation of soft starter power frequency after the soft completion, but two kinds of method of operation free choices adaptation different situation have improved the fail safe nature and the flexibility of asynchronous motor power supply, control.
Description
Technical field
This utility model belongs to asynchronous motor technological improvement, particularly relates to a kind of based on high-power asynchronous motor frequency conversion and the control device of startup.
Background technology
The power 6kV or the 10kV asynchronous motor more than or equal to 2000kW is according to working conditions change at present, and saving electric energy by Frequency Converter Control has preferable economic benefit.But converter is the control equipment needing often to safeguard, and transducer power unit, fuse etc. are easily-consumed products, can affect the properly functioning of asynchronous motor when converter repair and maintenance.Need to consider motor power frequency operation when converter repair and maintenance, and 2000kW and above asynchronous motor directly initiate and bigger impact can be caused to cause voltage pulsation electrical network, so it needs to carry out soft start.How Frequency Converter Control and soft initiator being controlled to combine reliably is problem demanding prompt solution.
Utility model content
The purpose of this utility model is to provide a kind of based on high-power asynchronous motor frequency conversion and the control device of soft start, it is intended to solve above-mentioned technical problem.
This utility model is realized in, a kind of based on high-power asynchronous motor frequency conversion and the control device of soft start, described control device includes asynchronous motor feeder cabinet, frequency conversion is soft opens selection cabinet, frequency-charger cabinet, soft-start cabinet, asynchronous motor and envelope star cabinet, the outfan of described asynchronous motor feeder cabinet connects the soft input opening selection cabinet of described frequency conversion by cable, described frequency conversion is soft opens the main junction box selecting the outfan of cabinet to be connected described asynchronous motor by cable, the soft selection cabinet that opens of described frequency conversion connects described frequency-charger cabinet and soft-start cabinet respectively by cable, the secondary rosette of described asynchronous motor connects the input of described envelope star cabinet by cable.
Further technical scheme of the present utility model is: described control device also includes PLC control system, is used for gathering on-off model and analog signals, sends instruction and controls asynchronous motor feeder cabinet, soft-start cabinet, the operation of frequency-charger cabinet.
Further technical scheme of the present utility model is: be provided with vacuum circuit breaker QF in described asynchronous motor feeder cabinet, first current transformer, spark gap, grounding knife switch, first computer integrated protection, the outfan of described vacuum circuit breaker QF connects the input of described first current transformer, the outfan of described first current transformer connects one end of described spark gap respectively, one end of grounding knife switch, the input of described first computer integrated protection connects the sampling end of described vacuum circuit breaker QF respectively, the sampling end of the first current transformer and the sampling end of grounding knife switch, the other end ground connection of described spark gap, the other end ground connection of described grounding knife switch.
Further technical scheme of the present utility model is: be provided with current quick unit, longitudinal differential protection unit, inverse time-lag protection unit and one-phase ground protection unit in the first computer integrated protection.
nullFurther technical scheme of the present utility model is: soft of described frequency conversion is provided with disconnection switch QS2 in selecting cabinet、Double-point double-throw switch QS11、Double-point double-throw switch QS12，2nd foot of described double-point double-throw switch QS11 connects the 2nd foot of described double-point double-throw switch QS12 through mechanical electric interlocking，1st foot of described double-point double-throw switch QS11 connects the outfan of described asynchronous motor feeder cabinet，1st foot of described double-point double-throw switch QS12 connects the outfan of described asynchronous motor feeder cabinet，3rd foot of described double-point double-throw switch QS11 connects the input of described soft-start cabinet，3rd foot of described double-point double-throw switch QS12 connects the input of described frequency-charger cabinet，One end of described disconnection switch QS2 connects the outfan of described frequency-charger cabinet，The other end of described disconnection switch QS2 connects the main junction box of described asynchronous motor.
Further technical scheme of the present utility model is: be provided with main contactor KM1 in described soft-start cabinet, bypass contactor KM2, soft initiator and disconnection switch QS1, one end of described main contactor KM1 connects the 3rd foot of described double-point double-throw switch QS11, the other end of described main contactor KM1 connects one end of bypass contactor KM2 and one end of soft initiator respectively, the other end of described bypass contactor KM2 is connected one end of described disconnection switch QS1 respectively with the other end of described soft initiator, the other end of described disconnection switch QS1 connects the main junction box of described asynchronous motor.
Further technical scheme of the present utility model is: be provided with transformator in described frequency-charger cabinet, second current transformer, power cell, control device and the second computer integrated protection, the input of described transformator connects the 3rd foot of described disconnection switch QS12, the outfan of described transformator connects the input of described second current transformer, the outfan of described second current transformer connects the input of described power cell, the outfan of described power cell connects one end of output busbar, the other end of described output busbar connects one end of described disconnection switch QS2, the outfan of described control device connects the control end of described power cell, the input of described second computer integrated protection connects sampling end and the input of high voltage side of transformer of described second current transformer respectively.
Further technical scheme of the present utility model is: be provided with overload protection unit, phase-lacking protective unit, Overvoltage protecting unit, overtemperature protection unit and current-limiting function unit in described second computer integrated protection.
Further technical scheme of the present utility model is: be provided with the 3rd current transformer and spark gap in described envelope star cabinet, the input of described 3rd current transformer connects the secondary rosette of described asynchronous motor, the input of described 3rd current transformer connects the input of described spark gap, the output head grounding of described spark gap.
Further technical scheme of the present utility model is: described on-off model includes double-point double-throw switch QS11, double-point double-throw switch QS12, disconnection switch QS1, disconnection switch QS2, the Guan Bi of vacuum circuit breaker QF, breaking signal；Soft initiator Autonomous test fault-free, run, bypass, fault intertripping signal；Converter Autonomous test fault-free, operation, fault intertripping signal；Analog signals includes asynchronous motor frequency conversion running current, power frequency operation electric current and running frequency；Described control instruction includes allowing soft start, soft start, soft stop, soft jerk；Allow converter to run, startup converter, stopping converter, converter jerk, preset rotation speed are given, continuous given rotating speed；Asynchronous motor feeder cabinet allows combined floodgate, asynchronous motor feeder cabinet intertripping.
The beneficial effects of the utility model are: use the Frequency Converter Control power 6kV or the 10kV asynchronous motor more than or equal to 2000kW can save electric energy time properly functioning；Using soft initiator to start asynchronous motor when frequency converter failure or maintenance and reduce the impact of electric motor starting Current on Grid, soft completes backed off after random soft initiator power frequency operation；Two kinds of methods of operation can adapt to different situations by unrestricted choice, improve asynchronous motor power, the security reliability that controls and motility.
Accompanying drawing explanation
Fig. 1 is the structural representation of the control device based on high-power asynchronous motor frequency conversion and soft start that this utility model embodiment provides.
Fig. 2 is the motor feeder cabinet electric control theory figure that this utility model embodiment provides.
Detailed description of the invention
Fig. 1 show that this utility model provides based on high-power asynchronous motor frequency conversion and the control device of soft start, described control device includes asynchronous motor feeder cabinet, frequency conversion is soft opens selection cabinet, frequency-charger cabinet, soft-start cabinet, asynchronous motor and envelope star cabinet, the outfan of described asynchronous motor feeder cabinet connects the soft input opening selection cabinet of described frequency conversion by cable, described frequency conversion is soft opens the main junction box selecting the outfan of cabinet to be connected described asynchronous motor by cable, the soft selection cabinet that opens of described frequency conversion connects described frequency-charger cabinet and soft-start cabinet respectively by cable, the secondary rosette of described asynchronous motor connects the input of described envelope star cabinet by cable.
Described control device also includes PLC control system, is used for gathering on-off model and analog signals, sends instruction and controls asynchronous motor feeder cabinet, soft-start cabinet, the operation of frequency-charger cabinet.
It is provided with vacuum circuit breaker QF in described asynchronous motor feeder cabinet, first current transformer, spark gap, grounding knife switch, first computer integrated protection, the outfan of described vacuum circuit breaker QF connects the input of described first current transformer, the outfan of described first current transformer connects one end of described spark gap respectively, one end of grounding knife switch, the input of described first computer integrated protection connects the sampling end of described vacuum circuit breaker QF respectively, the sampling end of the first current transformer and the sampling end of grounding knife switch, the other end ground connection of described spark gap, the other end ground connection of described grounding knife switch.
Current quick unit, longitudinal differential protection unit, inverse time-lag protection unit and one-phase ground protection unit it is provided with in first computer integrated protection.
nullSoft of described frequency conversion is provided with disconnection switch QS2 in selecting cabinet、Double-point double-throw switch QS11、Double-point double-throw switch QS12，2nd foot of described double-point double-throw switch QS11 connects the 2nd foot of described double-point double-throw switch QS12 through mechanical electric interlocking，1st foot of described double-point double-throw switch QS11 connects the outfan of described asynchronous motor feeder cabinet，1st foot of described double-point double-throw switch QS12 connects the outfan of described asynchronous motor feeder cabinet，3rd foot of described double-point double-throw switch QS11 connects the input of described soft-start cabinet，3rd foot of described double-point double-throw switch QS12 connects the input of described frequency-charger cabinet，One end of described disconnection switch QS2 connects the outfan of described frequency-charger cabinet，The other end of described disconnection switch QS2 connects the main junction box of described asynchronous motor.
Main contactor KM1, bypass contactor KM2, soft initiator and disconnection switch QS1 it is provided with in described soft-start cabinet, one end of described main contactor KM1 connects the 3rd foot of described double-point double-throw switch QS11, the other end of described main contactor KM1 connects one end of bypass contactor KM2 and one end of soft initiator respectively, the other end of described bypass contactor KM2 is connected one end of described disconnection switch QS1 respectively with the other end of described soft initiator, and the other end of described disconnection switch QS1 connects the main junction box of described asynchronous motor.
It is provided with transformator in described frequency-charger cabinet, second current transformer, power cell, control device and the second computer integrated protection, the input of described transformator connects the 3rd foot of described disconnection switch QS12, the outfan of described transformator connects the input of described second current transformer, the outfan of described second current transformer connects the input of described power cell, the outfan of described power cell connects one end of output busbar, the other end of described output busbar connects one end of described disconnection switch QS2, the outfan of described control device connects the control end of described power cell, the input of described second computer integrated protection connects sampling end and the input of high voltage side of transformer of described second current transformer respectively.
Overload protection unit, phase-lacking protective unit, Overvoltage protecting unit, overtemperature protection unit and current-limiting function unit it is provided with in described second computer integrated protection.
It is provided with the 3rd current transformer and spark gap in described envelope star cabinet, the input of described 3rd current transformer connects the secondary rosette of described asynchronous motor, the input of described 3rd current transformer connects the input of described spark gap, the output head grounding of described spark gap.
Described on-off model includes double-point double-throw switch QS11, double-point double-throw switch QS12, disconnection switch QS1, disconnection switch QS2, the Guan Bi of vacuum circuit breaker QF, breaking signal；Soft initiator Autonomous test fault-free, run, bypass, fault intertripping signal；Converter Autonomous test fault-free, operation, fault intertripping signal；Analog signals includes asynchronous motor frequency conversion running current, power frequency operation electric current and running frequency；Described control instruction includes allowing soft start, soft start, soft stop, soft jerk；Allow converter to run, startup converter, stopping converter, converter jerk, preset rotation speed are given, continuous given rotating speed；Asynchronous motor feeder cabinet allows combined floodgate, asynchronous motor feeder cabinet intertripping.
This control technology uses the Frequency Converter Control power 6kV or the 10kV asynchronous motor more than or equal to 2000kW to run when normal and saves electric energy, selects cabinet to be switched to power frequency operation when converter repair and maintenance by soft of frequency conversion, starts with soft initiator.Soft-start cabinet is also provided with bypass contactor, and after soft start completes, soft initiator exits, bypass contactor Guan Bi asynchronous motor power frequency operation.This control technology arranges two set protection devices to adapt to the different methods of operation, is controlled the reliability ensureing power supply and controlling by mechanical interlocking, electric interlock, PLC system simultaneously.
KYN28-12 type indoor metal armored removing type switch equipment is used to do asynchronous motor feeder cabinet, configuration vacuum circuit breaker QF, current transformer, spark gap, grounding knife switch, computer integrated protection (hereinafter referred to as microcomputer complex protection device 1) etc. in cabinet.Microcomputer complex protection device 1 requires to be configured with current quick, longitudinal differential protection, inverse time-lag protection, one-phase ground protection.Asynchronous motor feeder cabinet lower end cable is connected to soft of frequency conversion and selects cabinet.Soft of frequency conversion selects cabinet to be configured with disconnection switch QS2 and double-point double-throw switch QS11, QS12, is provided with machinery, electric interlock, can select converting operation or soft start power frequency operation by double-point double-throw switch QS11, QS12 between them.Knife-like switch QS11 lower end cable is connected to soft-start cabinet, and knife-like switch QS12 lower end cable is connected to frequency-charger cabinet.Soft-start cabinet is configured with main contactor KM1, bypass contactor KM2, soft initiator, disconnection switch QS1.Soft start early-stage preparations first to close QS11, QS1, sends signal and then close asynchronous motor feeder cabinet vacuum circuit breaker QF after disconnecting QS12, QS2, and soft initiator Autonomous test confirmation fault-free.First closing main contactor KM1 during soft start, then soft initiator is devoted oneself to work, and after soft start completes, bypass contactor KM2 Guan Bi soft initiator exits, and asynchronous motor enters power frequency operation.Frequency-charger cabinet is configured with transformator, power cell, control device, computer integrated protection (hereinafter referred to as microcomputer complex protection device 2).Microcomputer complex protection device 2 requires to be configured with overload protection, open-phase protection, overvoltage protection, overtemperature protection, current-limiting function.Converter runs early-stage preparations first to close QS12, QS2, sends signal and then close asynchronous motor feeder cabinet vacuum circuit breaker QF after disconnecting QS11, QS1, and converter Autonomous test confirmation fault-free.Putting into converter during converting operation, the signal sent further according to PLC control system runs or continuous change operation with preset given rotating speed.Frequency-charger cabinet lower end cable is connected to soft of frequency conversion and selects cabinet disconnection switch QS2 upper end, soft-start cabinet disconnection switch QS1 lower end cable is connected to soft of frequency conversion and selects cabinet disconnection switch QS2 lower end, to connect disconnection switch QS2 lower end and asynchronous motor main junction box with cable the most again.Finally it is connected to seal star cabinet from asynchronous motor pair rosette outgoing cable.Envelope star cabinet is configured with current transformer and spark gap, predominantly longitudinal differential protection and monitors asynchronous motor neutral point current and realize asynchronous motor neutral point envelope star.
The technical program is also configured with a set of PLC control system simultaneously, is used for gathering on-off model and analog signals, the most also sends instruction and controls asynchronous motor feeder cabinet, soft-start cabinet, the operation of frequency-charger cabinet.The on-off model gathered specifically includes that the Guan Bi of QS11, QS12, QS1, QS2, QF, breaking signal；Soft initiator Autonomous test fault-free, run, bypass, fault intertripping signal；Converter Autonomous test fault-free, operation, fault intertripping signal.The analog signals gathered specifically includes that asynchronous motor frequency conversion running current, power frequency operation electric current, running frequency etc..The control instruction sent specifically includes that permission soft start, soft start, soft stop, soft jerk；Allow converter to run, startup converter, stopping converter, converter jerk, preset rotation speed are given, continuous given rotating speed；Asynchronous motor feeder cabinet allows combined floodgate, asynchronous motor feeder cabinet intertripping.
(1) converting operation mode
First close QS12, QS2, disconnect QS11, QS1, PLC system gathers related switch amount signal and confirms that QS12, QS2 Guan Bi puts in place, QS11, QS1 disjunction puts in place and after converter Autonomous test fault-free, permission reclosing command, then Guan Bi asynchronous motor feeder cabinet vacuum circuit breaker QF can be sent to asynchronous motor feeder cabinet.Then can operate equipment at the scene or remote PLC system sends instructions input converter.Now asynchronous motor feeder cabinet, QS12, frequency-charger cabinet, QS2, asynchronous motor, envelope star cabinet are connected by cable electrical, asynchronous motor, by Frequency Converter Control, can run or continuous change operation with preset given rotating speed according to the instruction that PLC control system sends.
The setting of computer integrated protection: need to exit the longitudinal differential protection of microcomputer complex protection device 1 in computer integrated protection background system before using converting operation; feeder line is mainly shielded by microcomputer complex protection device 1, and converter and asynchronous motor are mainly shielded by microcomputer complex protection device 2.The reason using this protection setting is: the electric current that during converting operation, asynchronous motor feeder cabinet current transformer detects is power current; the electric current that envelope star cabinet current transformer detects is frequency conversion electric current; even if numerical value and the phase angle of the two electric current is the most inconsistent when asynchronous motor is properly functioning, longitudinal differential protection misoperation can be caused.
(2) soft start power frequency operation mode
First close QS11, QS1, disconnect QS12, QS2, PLC system gathers related switch amount signal and confirms that QS11, QS1 Guan Bi puts in place, QS12, QS2 disjunction puts in place and after soft initiator Autonomous test fault-free, permission switching signal, then Guan Bi asynchronous motor feeder cabinet vacuum circuit breaker QF can be sent to asynchronous motor feeder cabinet.Then can operate equipment at the scene or remote PLC system sends instructions Guan Bi main contactor KM1, put into soft initiator.Now asynchronous motor feeder cabinet, QS11, KM1, soft initiator, QS1, asynchronous motor, envelope star cabinet are connected by cable electrical, and asynchronous motor carries out soft start.After soft start completes, soft initiator can automatically exit from and send instruction Guan Bi bypass contactor KM2.Now asynchronous motor feeder cabinet, QS11, KM1, KM2, QS1, asynchronous motor, envelope star cabinet are connected by cable electrical, and asynchronous motor transfers power frequency operation to.
The setting of computer integrated protection: need to exit the inverse time-lag protection of microcomputer complex protection device 1 in computer integrated protection background system before using soft initiator soft start asynchronous motor, put into the inverse time-lag protection of microcomputer complex protection device 1 after asynchronous motor soft start completes to transfer power frequency operation to again.After asynchronous motor soft start-up process and soft start complete, asynchronous motor is protected by the power frequency operation stage by microcomputer complex protection device 1.The reason using this protection setting is: if asynchronous motor soft start uses soft pattern of constant current, it may appear that the situation that the asynchronous motor long period is run with several times (1-4 times) rated current, and inverse time-lag protection can take for electromotor overload and action.
The foregoing is only preferred embodiment of the present utility model, not in order to limit this utility model, all any amendment, equivalent and improvement etc. made within spirit of the present utility model and principle, within should be included in protection domain of the present utility model.
Claims (9)
1. one kind based on high-power asynchronous motor frequency conversion and the control device of soft start, it is characterized in that, described control device includes asynchronous motor feeder cabinet, frequency conversion is soft opens selection cabinet, frequency-charger cabinet, soft-start cabinet, asynchronous motor and envelope star cabinet, the outfan of described asynchronous motor feeder cabinet connects the soft input opening selection cabinet of described frequency conversion by cable, described frequency conversion is soft opens the main junction box selecting the outfan of cabinet to be connected described asynchronous motor by cable, the soft selection cabinet that opens of described frequency conversion connects described frequency-charger cabinet and soft-start cabinet respectively by cable, the secondary rosette of described asynchronous motor connects the input of described envelope star cabinet by cable.
Control device the most according to claim 1, it is characterised in that described control device also includes PLC control system, is used for gathering on-off model and analog signals, sends instruction and controls asynchronous motor feeder cabinet, soft-start cabinet, the operation of frequency-charger cabinet.
Control device the most according to claim 2, it is characterized in that, it is provided with vacuum circuit breaker QF in described asynchronous motor feeder cabinet, first current transformer, spark gap, grounding knife switch, first computer integrated protection, the outfan of described vacuum circuit breaker QF connects the input of described first current transformer, the outfan of described first current transformer connects one end of described spark gap respectively, one end of grounding knife switch, the input of described first computer integrated protection connects the sampling end of described vacuum circuit breaker QF respectively, the sampling end of the first current transformer and the sampling end of grounding knife switch, the other end ground connection of described spark gap, the other end ground connection of described grounding knife switch.
Control device the most according to claim 3, it is characterised in that be provided with current quick unit, longitudinal differential protection unit, inverse time-lag protection unit and one-phase ground protection unit in the first computer integrated protection.
nullControl device the most according to claim 4，It is characterized in that，Soft of described frequency conversion is provided with disconnection switch QS2 in selecting cabinet、Double-point double-throw switch QS11、Double-point double-throw switch QS12，2nd foot of described double-point double-throw switch QS11 connects the 2nd foot of described double-point double-throw switch QS12 through mechanical electric interlocking，1st foot of described double-point double-throw switch QS11 connects the outfan of described asynchronous motor feeder cabinet，1st foot of described double-point double-throw switch QS12 connects the outfan of described asynchronous motor feeder cabinet，3rd foot of described double-point double-throw switch QS11 connects the input of described soft-start cabinet，3rd foot of described double-point double-throw switch QS12 connects the input of described frequency-charger cabinet，One end of described disconnection switch QS2 connects the outfan of described frequency-charger cabinet，The other end of described disconnection switch QS2 connects the main junction box of described asynchronous motor.
Control device the most according to claim 5, it is characterized in that, main contactor KM1 it is provided with in described soft-start cabinet, bypass contactor KM2, soft initiator and disconnection switch QS1, one end of described main contactor KM1 connects the 3rd foot of described double-point double-throw switch QS11, the other end of described main contactor KM1 connects one end of bypass contactor KM2 and one end of soft initiator respectively, the other end of described bypass contactor KM2 is connected one end of described disconnection switch QS1 respectively with the other end of described soft initiator, the other end of described disconnection switch QS1 connects the main junction box of described asynchronous motor.
Control device the most according to claim 6, it is characterized in that, it is provided with transformator in described frequency-charger cabinet, second current transformer, power cell, control device and the second computer integrated protection, the input of described transformator connects the 3rd foot of described disconnection switch QS12, the outfan of described transformator connects the input of described second current transformer, the outfan of described second current transformer connects the input of described power cell, the outfan of described power cell connects one end of output busbar, the other end of described output busbar connects one end of described disconnection switch QS2, the outfan of described control device connects the control end of described power cell, the input of described second computer integrated protection connects sampling end and the input of high voltage side of transformer of described second current transformer respectively.
Control device the most according to claim 7, it is characterised in that be provided with overload protection unit, phase-lacking protective unit, Overvoltage protecting unit, overtemperature protection unit and current-limiting function unit in described second computer integrated protection.
Control device the most according to claim 8, it is characterized in that, it is provided with the 3rd current transformer and spark gap in described envelope star cabinet, the input of described 3rd current transformer connects the secondary rosette of described asynchronous motor, the input of described 3rd current transformer connects the input of described spark gap, the output head grounding of described spark gap.
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105119551A (en) * | 2015-10-09 | 2015-12-02 | 广西华锐钢铁工程设计咨询有限责任公司 | Large power asynchronous motor frequency conversion and soft start-based control device |
| CN106533268A (en) * | 2016-11-25 | 2017-03-22 | 北京动力机械研究所 | Soft starting method of power output of micro gas turbine power station |
| CN107359828A (en) * | 2017-07-28 | 2017-11-17 | 沈阳华创风能有限公司 | A kind of yaw drive system protection device and method |
| CN107968616A (en) * | 2016-10-18 | 2018-04-27 | 陕西吉特安全科技有限公司 | A kind of energy saving fuel delivery device of intelligent control |
| CN108414874A (en) * | 2018-03-09 | 2018-08-17 | 中铁十局集团电务工程有限公司 | Differential protection circuit method of calibration, device and equipment |
| CN111330698A (en) * | 2020-03-26 | 2020-06-26 | 厦门理工学院 | A continuous ball mill and control method |
| CN113098359A (en) * | 2021-04-13 | 2021-07-09 | 山东理工大学 | Motor starting control method |
| CN113890417A (en) * | 2021-10-11 | 2022-01-04 | 河南省中原大化集团有限责任公司 | Starting method of main motor of high-power chilling gas compressor under soft start-free condition |
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- 2015-10-09 CN CN201520778369.5U patent/CN205490284U/en active Active
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105119551A (en) * | 2015-10-09 | 2015-12-02 | 广西华锐钢铁工程设计咨询有限责任公司 | Large power asynchronous motor frequency conversion and soft start-based control device |
| CN107968616A (en) * | 2016-10-18 | 2018-04-27 | 陕西吉特安全科技有限公司 | A kind of energy saving fuel delivery device of intelligent control |
| CN106533268A (en) * | 2016-11-25 | 2017-03-22 | 北京动力机械研究所 | Soft starting method of power output of micro gas turbine power station |
| CN107359828A (en) * | 2017-07-28 | 2017-11-17 | 沈阳华创风能有限公司 | A kind of yaw drive system protection device and method |
| CN108414874A (en) * | 2018-03-09 | 2018-08-17 | 中铁十局集团电务工程有限公司 | Differential protection circuit method of calibration, device and equipment |
| CN111330698A (en) * | 2020-03-26 | 2020-06-26 | 厦门理工学院 | A continuous ball mill and control method |
| CN113098359A (en) * | 2021-04-13 | 2021-07-09 | 山东理工大学 | Motor starting control method |
| CN113890417A (en) * | 2021-10-11 | 2022-01-04 | 河南省中原大化集团有限责任公司 | Starting method of main motor of high-power chilling gas compressor under soft start-free condition |
| CN113890417B (en) * | 2021-10-11 | 2024-03-26 | 河南省中原大化集团有限责任公司 | Starting method of main motor of high-power refrigerating air compressor under soft start condition |
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