CN218416227U - Power supply switching control system for high-voltage motor of lifting pump of cyclone well - Google Patents
Power supply switching control system for high-voltage motor of lifting pump of cyclone well Download PDFInfo
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- CN218416227U CN218416227U CN202222768201.9U CN202222768201U CN218416227U CN 218416227 U CN218416227 U CN 218416227U CN 202222768201 U CN202222768201 U CN 202222768201U CN 218416227 U CN218416227 U CN 218416227U
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Abstract
The utility model discloses a power supply switching control system of a high-voltage motor of a lifting pump of a cyclone well, which comprises a high-voltage soft starter system, a high-voltage frequency converter control system and a motor power supply switching system; the high-voltage soft starter system and the high-voltage frequency converter control system are connected to the input end of the motor power supply switching system, and the output end of the motor power supply switching system is connected to the power end of the high-voltage motor of the cyclone well lifting pump. The utility model discloses a whirl well elevator pump high-voltage motor power switching control system adds the control that one set of high-voltage inverter is used for the elevator pump motor to adopt auto-change over device to make the motor switch between high-pressure soft starter and high-voltage inverter.
Description
Technical Field
The utility model particularly relates to a whirl well elevator pump high-pressure motor power supply switching control system belongs to the turbid water supply system technical field who encircles of steel rolling production line.
Background
In a turbid circulating water supply system of a steel rolling production line, a cyclone well is used for collecting turbid circulating water after cooling of a rolling line, impurities in the water are filtered after primary precipitation, and the turbid circulating water is pumped to a clarifier for sewage separation through a high-pressure lifting pump arranged on a second-layer platform of the cyclone well, so that the running condition of the high-pressure lifting pump determines whether the production line can use enough turbid circulating water; once the high-voltage lift pump motor stops operating, turbid circulating water collected to the cyclone well by a rolling line cannot be timely conveyed away, so that the water level of the cyclone well overflows, and the electric shock risk is caused once the field lift pump motor is in contact with the turbid circulating water due to 10KV high-voltage power supply; the turbid circulating water cannot continuously return to the rolling line after the lifting pump is stopped, so that the rolling mill cannot be cooled and cannot continue to produce; the lift pump motor that uses at present adopts the control mode of high-pressure soft starter, trips among the start-up process appear easily, starting current potential hazards such as great.
SUMMERY OF THE UTILITY MODEL
In order to solve the problem, the utility model provides a whirl well elevator pump high-voltage motor power switching control system adds the control that one set of high-voltage inverter is used for the elevator pump motor to adopt auto-change over device to make the motor switch between high-pressure soft starter and high-voltage inverter.
The utility model discloses a whirl well elevator pump high-pressure motor power switching control system, including high-pressure soft starter system, high-voltage inverter control system and motor power switching system; the high-voltage soft starter system and the high-voltage frequency converter control system are connected to the input end of the motor power supply switching system, and the output end of the motor power supply switching system is connected to the power end of the high-voltage motor of the cyclone well lifting pump.
Furthermore, the high-voltage vacuum circuit breaker control cabinet is connected with a high-voltage soft start controller control cabinet; the high-voltage vacuum circuit breaker control cabinet is connected to a high-voltage bus; the control cabinet of the high-voltage soft start controller is connected to a motor power supply switching system; after the high-voltage vacuum circuit breaker control cabinet is switched on, the high-voltage soft start controller has running conditions, once a field operation running signal arrives, the soft starter drives the motor to be started to the rated rotating speed of the motor, and then a bypass contactor of the high-voltage soft start controller switches the circuit to enable the motor to run in a power frequency state; the high-voltage frequency converter control system comprises a phase-shifting transformer connected to a high-voltage bus, and the phase-shifting transformer is connected to a motor power supply switching system through a power unit; the control end of the power unit is accessed to a variable frequency control system; the frequency can be adjusted through the power unit by the control system, so that the water feeding amount of the water pump is controlled; the running frequency of the motor can be properly reduced under the condition that the rolling line is stopped, and the purpose of saving electric energy is realized; the motor power supply switching system comprises a switching cabinet, wherein a plurality of groups of high-voltage isolating switches are arranged in the switching cabinet; the high-voltage soft starter system, the high-voltage isolating switch and the high-voltage motor of the swirl well lifting pump form a first loop; the high-voltage frequency converter control system, the high-voltage isolating switch and the high-voltage motor of the whirling well lift pump form a second loop; the high-voltage isolating switch mainly comprises three parts, namely an explosion-proof shell, a machine core and a cable leading-in device; the explosion-proof shell consists of a left explosion-proof main cavity and a right explosion-proof main cavity which are independent, the movement consists of two combined isolating switches with locking devices and a controller which meets the protection function of a power supply system, an external power supply is divided into two loops (a high-voltage soft starter system and a high-voltage frequency converter control system) to supply power to two high-voltage motors, and the two loops of power supplies are mutually standby;
furthermore, the high-voltage isolating switch is an electromagnetic lock which is provided with interlocking control; the electromagnetic lock is used as a limiting mechanism for interlocking control, and the isolating switch can only be operated when the frequency converter and the high-voltage soft start are completely powered off; when a motor has selected the switch-on of the isolating switch of the soft start operation loop, the isolating switch of the frequency converter operation loop can not be switched on.
Compared with the prior art, the utility model discloses a whirl well elevator pump high-pressure motor power switching control system, elevator pump motor adopt high-voltage inverter controller to go on when starting, can be in the operating frequency of the appropriate turn down motor under the condition that the line shut down of rolling, realize the purpose of saving the electric energy.
When the motor of the lift pump is normal and the frequency converter has a fault, the motor can be separated from the high-voltage frequency converter through the power supply switching control device and then connected with the high-voltage soft start controller, manual wiring is not needed in the whole process, only the corresponding operation switch is switched after power failure is confirmed, and the normal operation of equipment can be recovered in a short time; the operating efficiency of equipment is promoted.
Drawings
Fig. 1 is a schematic diagram of a module structure according to embodiment 1 of the present invention.
Fig. 2 is a schematic view of the overall structure of embodiment 1 of the present invention.
Detailed Description
Example 1:
the power supply switching control system of the high-voltage motor of the whirling well lift pump shown in the figure 1 comprises a high-voltage soft starter system, a high-voltage frequency converter control system and a motor power supply switching system; the high-voltage soft starter system and the high-voltage frequency converter control system are connected to the input end of the motor power supply switching system, and the output end of the motor power supply switching system is connected to the power end of the high-voltage motor of the cyclone well lifting pump.
As shown in fig. 2, the high-voltage vacuum circuit breaker control cabinet is connected with a high-voltage soft start controller control cabinet; the high-voltage vacuum circuit breaker control cabinet is connected to a high-voltage bus; the control cabinet of the high-voltage soft start controller is connected to a motor power supply switching system; the high-voltage inverter control system comprises a phase-shifting transformer connected to a high-voltage bus, and the phase-shifting transformer is connected to a motor power supply switching system through a power unit; the control end of the power unit is accessed to a variable frequency control system; the motor power supply switching system comprises a switching cabinet, wherein a plurality of groups of high-voltage isolating switches are arranged in the switching cabinet; the high-voltage soft starter system, the high-voltage isolating switch and the high-voltage motor of the whirling well lift pump form a first loop; the high-voltage frequency converter control system, the high-voltage isolating switch and the high-voltage motor of the cyclone well lift pump form a second loop;
the high-voltage isolating switch is an electromagnetic lock with interlocking control.
The transformation process is as follows:
firstly, according to parameters such as the capacity of a high-voltage motor of a lift pump on site, selecting a corresponding high-voltage frequency converter, and installing the high-voltage frequency converter in place;
secondly, determining a corresponding power supply switching device control cabinet according to the number of the lifting pumps, and setting the interlocking control condition of the power supply switching device control cabinet, so as to finally realize safe and reliable operation;
and thirdly, aiming at the control mode that the same motor is originally in a soft start control mode and needs to be improved to a control mode of two incoming line switches, cable equipment is additionally arranged to enable the main loop and the control loop to be communicated.
Hardware composition: the high-voltage frequency converter control device comprises a high-voltage frequency converter control device set, a high-voltage soft starter control device three sets, a high-voltage switch cabinet three sets and a power supply switching device set;
A. high-voltage soft starter controlling means: the high-voltage soft starter is used for carrying out conventional starting on a high-voltage motor of the lifting pump, and the high-voltage soft starter is used for driving the motor to operate when the lifting pump is normally used; the high-voltage soft start controller is composed of a high-voltage vacuum circuit breaker control cabinet and a high-voltage soft start controller control cabinet, when the high-voltage vacuum circuit breaker control cabinet is switched on, the high-voltage soft start controller has operating conditions, once a field operation signal arrives, the soft start controller drives a motor to be started to the rated rotating speed of the motor, and then a bypass contactor of the high-voltage soft start controller switches a circuit to enable the motor to operate in a power frequency state;
B. high-voltage inverter controlling means: the high-voltage frequency converter controller adopts the frequency conversion speed regulation principle: the rotating speed expression of the alternating current asynchronous motor is as follows: n = (1-s) 60f/p;
in the formula: s is slip; p is the number of pole pairs of the motor; f is the running frequency of the motor; then: if the frequency f of the alternating current applied to the stator winding of the asynchronous motor is smoothly changed, the rotor speed n of the asynchronous motor can be smoothly adjusted; motor characteristics: V/F =4.44 phi, V is a voltage; f is the frequency; phi is a main magnetic flux (phi is too small, ferromagnetic materials are not fully utilized, and torque generated by the same current is small; phi is too large, and because of the saturation characteristic of the ferromagnetic materials, the exciting current component in stator current is increased, under the condition of the same current load, the corresponding torque current component is reduced, and the load capacity of the motor is also reduced), the phi must be constant;
in the normal use process, two lift pump high-voltage motors (three lift pumps, only two lift pumps are operated) can be operated at the same time, one lift pump high-voltage motor adopts a soft start control mode and the other lift pump high-voltage motor adopts a frequency converter for control in the operation process of the two lift pump high-voltage motors, and the frequency of the lift pump high-voltage motor controlled by the frequency converter (the high-voltage frequency converter drives the lift pump high-voltage motor to operate) can be adjusted, so that the control of the water feeding amount of the water pump is realized;
a power supply switching device: the power supply switching device has the advantages that three high-voltage motors of the lifting pump are controlled in a centralized mode by adding high-voltage isolating switches through cables, the motors are switched between the high-voltage soft start controller and the high-voltage frequency converter, when the motors need to be controlled by the frequency converter, the isolating switches are driven to the position of the frequency converter, and when the motors need to be controlled by the soft start controller, the isolating switches are driven to the position of the soft start controller;
the isolating switch in the power supply switching device is provided with an electromagnetic lock as a limiting mechanism for interlocking control, and the isolating switch can be operated under the condition that the frequency converter and the high-voltage soft start are completely powered off. When one of the motors has selected the isolating switch of the soft start operation loop to be switched on, the isolating switch of the frequency converter operation loop can not be switched on.
The above-mentioned embodiment is only the preferred embodiment of the present invention, so all the equivalent changes or modifications made by the structure, features and principles of the present invention are included in the claims of the present invention.
Claims (3)
1. The utility model provides a whirl well elevator pump high-voltage motor power switching control system which characterized in that: the system comprises a high-voltage soft starter system, a high-voltage frequency converter control system and a motor power supply switching system; the high-voltage soft starter system and the high-voltage frequency converter control system are connected to the input end of the motor power supply switching system, and the output end of the motor power supply switching system is connected to the power end of the high-voltage motor of the cyclone well lifting pump.
2. The power supply switching control system for the high-voltage motor of the whirling well hoisting pump of claim 1, characterized in that: the high-voltage vacuum circuit breaker control cabinet is connected with a high-voltage soft start controller control cabinet; the high-voltage vacuum circuit breaker control cabinet is connected to a high-voltage bus; the control cabinet of the high-voltage soft start controller is connected to a motor power supply switching system; the high-voltage frequency converter control system comprises a phase-shifting transformer connected to a high-voltage bus, and the phase-shifting transformer is connected to a motor power supply switching system through a power unit; the control end of the power unit is accessed to a variable frequency control system; the motor power supply switching system comprises a switching cabinet, wherein a plurality of groups of high-voltage isolating switches are arranged in the switching cabinet; the high-voltage soft starter system, the high-voltage isolating switch and the high-voltage motor of the whirling well lift pump form a first loop; and the high-voltage frequency converter control system, the high-voltage isolating switch and the high-voltage motor of the swirl well lift pump form a second loop.
3. The power supply switching control system for the high-voltage motor of the whirling well hoisting pump of claim 2, characterized in that: the high-voltage isolating switch is an electromagnetic lock which is arranged with interlocking control.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202222768201.9U CN218416227U (en) | 2022-10-20 | 2022-10-20 | Power supply switching control system for high-voltage motor of lifting pump of cyclone well |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202222768201.9U CN218416227U (en) | 2022-10-20 | 2022-10-20 | Power supply switching control system for high-voltage motor of lifting pump of cyclone well |
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| Publication Number | Publication Date |
|---|---|
| CN218416227U true CN218416227U (en) | 2023-01-31 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202222768201.9U Active CN218416227U (en) | 2022-10-20 | 2022-10-20 | Power supply switching control system for high-voltage motor of lifting pump of cyclone well |
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| Country | Link |
|---|---|
| CN (1) | CN218416227U (en) |
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- 2022-10-20 CN CN202222768201.9U patent/CN218416227U/en active Active
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