CN212210873U - Mobile modularized soft starting device - Google Patents

Abstract

A movable modularized soft starting device comprises a dry self-coupling transformer body, a reactive generator, a switching isolation cabinet and a control cabinet, wherein a large motor starting device adopts different voltage reduction starting modes according to different load and power grid conditions, the starting device is a non-standard product, however, once the starting devices are damaged, a certain time is needed for repair, and the device is small in occupied area, compact in structure, flexible and convenient to transport.

Description

Mobile modularized soft starting device

Technical Field

The utility model relates to a soft starting drive of portable modularization. Belonging to the technical field of soft start.

Background

At present, most of motor voltage reduction starting devices are installed in fixed places, starting equipment quits running after starting is completed, various voltage reduction starting modes are adopted for starting a large motor according to different load and power grid conditions, the starting device is a non-standard product, and once the starting equipment is damaged, a certain time is needed for repairing, so that great economic loss is caused. The movable large-scale motor voltage reduction starting device is developed by combining the characteristics of a box type transformer on the basis of key equipment such as a switch cabinet, a self-coupling transformer body and a reactive generator and is designed into modularization. The module has compact structure, is reasonable, safe and reliable, is convenient to transport and hoist, and has small debugging workload. The power and control cables are arranged in layers and ensure proper length. The debugging period is short, the movable fixed asset is realized, and the movement is convenient; and great time benefit can be brought into play in equipment emergency repair. The device has the initiation of domestic industry, and can ensure that the original large-scale motor starting device is quickly replaced to ensure normal production when the original device fails. Meanwhile, the movable modularized soft starting device can be completely separated and pulled away after the machine is started.

Disclosure of Invention

In order to solve the technical problem, the utility model provides a soft starting drive of portable modularization, for realizing above-mentioned purpose, the utility model discloses a following technical scheme: the utility model provides a portable modularization soft start device, it includes switches cabinet, self coupling becomes body, reactive generator, switch cabinet comprises power cabinet, operation cabinet, star point cabinet, sets up a compartment between every cabinet body, and the self coupling becomes the body and sets up a compartment, and reactive generator sets up a compartment, switch cabinet and self coupling become the body and constitute a basic start unit, the reactive generator interval is as affiliated combination interval, and it comprises reactive compensation, switch board, isolation cabinet, switch cabinet, self coupling become the body, connect by the cable between the reactive generator.

Preferably, the method comprises the following steps: one side of the self-coupling transformer body is connected with the power cabinet, the star point of the self-coupling transformer body is connected with the star point cabinet, the double-end isolating switch in the control cabinet of the reactive power generation device is respectively connected with the power cabinet and the isolating cabinet, the wire outlet end of the isolating cabinet is connected with the operation cabinet, and the wire outlet end of the operation cabinet is connected with the wire inlet side of the motor power supply.

Has the advantages that:

the utility model discloses a device design is novel, and the scheme is reliable, device compact structure, and the debugging is easy, does not basically have the maintenance work load, possesses perfect logic control simultaneously, protects motor and starting equipment effectively, and field debugging shortens the cycle and wins the early reproduction and establishes solid basis.

After the device is successfully researched and developed, the device can cover a voltage reduction starting device or an emergency starting device driven by a large motor below 40000 KW.

Drawings

Fig. 1 is a schematic diagram of the present invention.

Detailed Description

The present invention will be further explained with reference to the drawings and examples.

The mobile modularized soft start device of the embodiment comprises a switching cabinet (a power supply cabinet QF1, a running cabinet QF2, a star point cabinet QF3), an auto-transformer body, a reactive compensation control cabinet QF4 and an isolation cabinet QF5, wherein the auto-transformer body is provided with a compartment, and a reactive generator (a reactive compensation, control cabinet QF4 and an isolation cabinet QF5) is provided with a compartment which is arranged indoors and outdoors with a ceiling protection grade IP 55. The switch cabinet (power supply cabinet QF1, operation cabinet QF2, star point cabinet QF3) and the auto-transformer body form a basic starting unit, the idle generator intervals are used as auxiliary combined intervals, and the intervals are arranged outdoors with a ceiling protection grade IP 55. The primary side of the auto-transformer body is connected with QF1, the star point of the auto-transformer body is connected with a star point cabinet QF3, a double-end isolating switch G in a control cabinet of the reactive power generation device is respectively connected with QF1 and QF5, the outlet end of the QF5 is connected with a switch cabinet QF2, and the outlet end of the QF2 is connected with the inlet side of a motor power supply.

When the short-circuit capacity of the power grid can meet the starting requirement of the existing motor, the basic starting device is formed only by basic starting units (a switching cabinet and a soft starting body) to achieve the starting purpose. When the short-circuit capacity of the field power grid is small and the basic starting unit cannot meet the starting condition of the existing motor, the basic starting unit (a switch cabinet and a soft starting body) is adopted and a reactive generator unit is added. The reactive generator unit is switched to the power grid side or the motor side through the isolation knife switching selection operation to form a complete set of starting device with more excellent performance; each bay unit protection class IP55 may be satisfactory for indoor and outdoor arrangements. The device performance parameter control screen is centrally displayed, the automation degree is high, the control precision is high, and the mobile modularized soft starting device is characterized in that: the mobile modularized soft starting device selects a complete set of starting devices of the additional reactive generator interval units according to the parameters of the power grid on the basis of the basic starting unit. The additional reactive generator device is added, so that the starting performance of the basic starting unit is greatly improved, and the purpose of meeting the starting requirements of the motor under different power grid working conditions is achieved.

The utility model discloses a theory of operation is:

(1) basic starting unit operating principle:

when starting, the breaker QF3 is closed first, the tail end of the three-phase winding of the self-coupling transformer body is short-connected into 0 point, and the connection is Ya 0. Then the breaker QF1 is closed, the bus voltage is sent to the self-coupling transformer body, the voltage is sent to the motor from the secondary tap thereof, and the motor starts to start.

When the current of the motor is reduced to a set value or the rotating speed reaches a set rotating speed, the circuit breaker QF3 is disconnected, the self-coupling transformer body is connected in series in a stator loop of the motor as a series winding, and the self-coupling transformer body is in a reactance running state. The time of the transition stage lasts for 1-4 seconds, the starting current is reduced to 1-1.2 times of rated current, the QF2 switch is switched on, the circuit breaker QF2 sends full voltage to the motor wiring terminal, at the moment, the QF1 is respectively switched off (the self-coupling transformer body quits running), and the whole starting is completed.

(2) The basic starting unit and the additional reactive generator unit work principle:

when starting, the breaker QF3 is closed first, the tail end of the three-phase winding of the self-coupling transformer body is short-connected into 0 point, and the connection is Ya 0. Then the breaker QF1 is closed, the bus voltage is sent to the self-coupling transformer body, the voltage is sent to the motor from the secondary tap of the self-coupling transformer body, and the motor starts to start; in the whole starting process, the capacitance control isolation knife can be switched to a soft start power supply end or a motor wire outlet end according to the system condition.

When the current of the motor is reduced to a set value or the rotating speed reaches a set rotating speed, the QF4 is disconnected to cut off the reactive power compensation device, then the breaker QF3 is disconnected, the series winding of the self-coupling transformer body is connected in series in a loop of the stator and the bus of the motor, and the self-coupling transformer body is in a reactor running state. The time of the transition stage lasts for about 1-4 seconds, the starting current is reduced to 1-1.2 times of rated current, the QF2 switch is switched on, the breaker QF2 sends full voltage to the motor wiring terminal, at the moment, QF1 and QF5 are respectively disconnected (the auto-transformer body is out of operation), then QF4 is disconnected, and the whole starting is completed.

To the limitation of the protection scope of the present invention, it should be understood by those skilled in the art that, on the basis of the technical solution of the present invention, various modifications or deformations that can be made by those skilled in the art without creative efforts are still within the protection scope of the present invention.

Claims (2)

1. The utility model provides a portable modularization soft start device, it includes the switch board, the auto-transformer body, reactive generator, its characterized in that the switch board comprises power cabinet (QF 1), operation cabinet (QF2), star point cabinet (QF 3), sets up a compartment between every cabinet body, and the auto-transformer body sets up a compartment, and reactive generator sets up a compartment, switch board and auto-transformer body constitute a basic starting unit, the reactive generator interval is as affiliated group interval, and it comprises reactive compensation, the auto-transformer body (QF 4), isolation cabinet (QF5), switch board, auto-transformer body, reactive generator are connected by the cable between.

2. The mobile modular soft starter of claim 1, wherein one side of the autotransformer body is connected with a power supply cabinet (QF 1), the star point of the autotransformer body is connected with a star point cabinet (QF 3), a double-end isolating switch (G) in the control cabinet of the reactive power generator is respectively connected with the power supply cabinet (QF 1) and an isolating cabinet (QF5), the outlet end of the isolating cabinet (QF5) is connected with the running cabinet (QF2), and the outlet end of the running cabinet (QF2) is connected with the inlet side of the motor power supply.

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