CN219018667U

CN219018667U - Emergency bypass device for high-voltage motor

Info

Publication number: CN219018667U
Application number: CN202223181073.4U
Authority: CN
Inventors: 归菊; 衡永彬
Original assignee: Wuxi Unite Energy Technology Co Ltd
Current assignee: Wuxi Unite Energy Technology Co Ltd
Priority date: 2022-11-29
Filing date: 2022-11-29
Publication date: 2023-05-12
Anticipated expiration: 2032-11-29

Abstract

The utility model relates to the technical field of motors, in particular to an emergency bypass device for a high-voltage motor, which comprises a motor, wherein a single-pole double-throw isolating switch is connected to the motor, a first high-voltage frequency converter is connected to the single-pole double-throw isolating switch, a single-pole single-throw isolating switch is connected to the first high-voltage frequency converter, a first power bus is connected to the single-pole single-throw isolating switch, a first high-voltage contactor is further connected to the motor through the single-pole double-throw isolating switch, a second high-voltage frequency converter is connected to the first high-voltage contactor, a second high-voltage switch is connected to the second high-voltage contactor, and a second power bus is connected to the second high-voltage switch.

Description

Emergency bypass device for high-voltage motor

Technical Field

The utility model relates to the technical field of motors, in particular to an emergency bypass device for a high-voltage motor.

Background

Along with the rapid progress of the national economic development, especially the popularization and popularization of industries such as basic construction, mines, tunnels, high-speed rails and the like, large-scale motor equipment is widely used, the use of a high-voltage motor is widely applied, and the traditional use method is to directly adopt a high-voltage frequency converter to drag the motor and directly control the frequency converter to drag the motor for use.

The use process that current converter drove the motor also discovers some drawbacks, is in case the converter breaks down, just needs to shut down to overhaul, and this seriously influences the engineering progress to and the increase of cost of labor, adopts the standby machine to change also not very realistic, has increased a large amount of input cost, and on-the-spot change is also more troublesome, also can influence the production progress.

Disclosure of Invention

Aiming at the situation, the utility model aims to overcome the defects of the prior art, and provides an emergency bypass device for a high-voltage motor, which can enable a frequency converter unit to run more economically and reliably, can rapidly switch off a faulty frequency converter for maintenance, does not delay the normal operation of the motor, meets the electric five-prevention requirement of a high-voltage switch cabinet on the premise of meeting the functions, ensures the safety of maintenance staff, and has the characteristics of safety and reliability.

The technical aim of the utility model is realized by the following technical scheme:

the utility model provides an emergent bypass device for high voltage motor, includes the motor, be connected with single-pole double-throw isolator on the motor, be connected with first high-voltage inverter on the single-pole double-throw isolator, be connected with single-pole single-throw isolator on the first high-voltage inverter, be connected with first high-voltage switch on the single-pole single-throw isolator, first high-voltage switch inserts and is equipped with first power bus.

Further, the motor is further connected with a first high-voltage contactor through a single-pole double-throw isolating switch, the first high-voltage contactor is connected with a second high-voltage frequency converter, the second high-voltage frequency converter is connected with a second high-voltage contactor, the second high-voltage contactor is connected with a second high-voltage switch, and a second power bus is connected to the second high-voltage switch in an accessed mode.

Further, a third high-voltage contactor is further connected to the motor through a single-pole double-throw isolating switch, the third high-voltage contactor is connected to the front of the second high-voltage contactor, and a power frequency line is connected to the third high-voltage contactor.

In summary, the utility model has the following beneficial effects:

the utility model is provided with two groups of frequency converters as alternative working hardware facilities, can provide three working modes, namely, the first frequency converter works, the second frequency converter works, and the third frequency converter works, so that the problem of frequency converter faults can be solved, and when any frequency converter fails, the working loop of the frequency converter can be immediately disconnected, and the frequency converter can be independently overhauled, so that the frequency converter can be manufactured without shutdown and replacement.

Drawings

The accompanying drawings, which are included to provide a further understanding of the utility model and are incorporated in and constitute a part of this application, illustrate and together with the description serve to explain the utility model, if necessary:

fig. 1 is a schematic diagram of the connection of the present utility model.

In the figure, 1, a motor; 2. a first high voltage inverter; 3. a second high voltage inverter; 4. a first power bus; 5. a second power bus; 6. a power frequency line; 7. single pole double throw isolating switch; 8. a single pole single throw isolation switch; 9. a first high voltage switch; 10. a second high voltage switch; 11. a first high voltage contactor; 12. a second high voltage contactor; 13. and a third high voltage contactor.

Detailed Description

The foregoing and other features, aspects and advantages of the present utility model will become more apparent from the following detailed description of the embodiments, which proceeds with reference to the accompanying fig. 1. The following embodiments are described in detail with reference to the drawings.

Exemplary embodiments of the present utility model will be described below with reference to the accompanying drawings.

Example 1: the utility model provides a bypass cabinet for high voltage motor 1, includes motor 1, is connected with single-pole double-throw isolator 7 on the motor 1, is connected with first high-voltage inverter 2 on the single-pole double-throw isolator 7, is connected with single-pole single-throw isolator 8 on the first high-voltage inverter 2, is connected with first high-voltage switch 9 on the single-pole single-throw isolator 8, and first high-voltage switch 9 inserts and is equipped with first power bus 4.

The motor 1 is also connected with a first high-voltage contactor 11 through a single-pole double-throw isolating switch 7, the first high-voltage contactor 11 is connected with a second high-voltage frequency converter 3, the second high-voltage frequency converter 3 is connected with a second high-voltage contactor 12, the second high-voltage contactor 12 is connected with a second high-voltage switch 10, and the second high-voltage switch 10 is connected with a second power bus 5.

The motor 1 is also connected with a third high-voltage contactor 13 through a single-pole double-throw isolating switch 7, the third high-voltage contactor 13 is connected before the second high-voltage contactor 12, and the third high-voltage contactor 13 is connected with a power frequency line 6.

In the embodiment of the utility model, when in operation, the motor 1 can select two bypass connection modes of working principles, and the two high-voltage frequency converters, namely the first high-voltage frequency converter 2 and the second high-voltage frequency converter 3, are also used for standby, and the switching process needs to be manually carried out:

(1) the single-pole double-throw isolating switch 7 is communicated with the first high-voltage frequency converter 2, the first frequency converter works as a main unit at ordinary times, when the first frequency converter fails, the first frequency converter is disconnected by the single-pole single-throw isolating switch 8, and then the motor 1 is switched to other lines by the single-pole double-throw isolating switch 7, so that the first frequency converter can be completely separated from a working loop, and maintenance is convenient.

(2) When the first frequency converter fails, the circuit can be switched to the second frequency converter, the second frequency converter bears the duty of operation, at this time, the first high-voltage contactor 11 and the second high-voltage contactor 12 are both in a closed state, and the third high-voltage contactor 13 is in an open state.

(3) If the second frequency converter also fails, the control circuit is used to control the opening of the second high-voltage contactor 12, and then the control circuit is used to open the first high-voltage contactor 11 and simultaneously close the third high-voltage contactor 13, so that the second frequency converter is completely separated and maintained.

In the above-described operating conditions, it is required that the first high-voltage contactor 11 and the third high-voltage contactor 13 cannot be closed at the same time, that the second high-voltage contactor 12 and the third high-voltage contactor 13 cannot be closed at the same time, that interlocking is electrically achieved, that the first high-voltage contactor 11 and the second high-voltage contactor 12 are closed during variable frequency operation, that the third high-voltage contactor 13 is opened, that the third high-voltage contactor 13 is closed during industrial frequency operation, and that the first high-voltage contactor 11 and the second high-voltage contactor 12 are opened.

While the utility model has been described in connection with certain embodiments, it is not intended that the utility model be limited thereto; for those skilled in the art to which the present utility model pertains and the related art, on the premise of based on the technical scheme of the present utility model, the expansion, the operation method and the data replacement should all fall within the protection scope of the present utility model.

Claims

1. An emergency bypass device for a high voltage motor, comprising a motor (1), characterized in that: the high-voltage power supply is characterized in that a single-pole double-throw isolating switch (7) is connected to the motor (1), a first high-voltage frequency converter (2) is connected to the single-pole double-throw isolating switch (7), a single-pole single-throw isolating switch (8) is connected to the first high-voltage frequency converter (2), a first high-voltage switch (9) is connected to the single-pole single-throw isolating switch (8), and a first power bus (4) is connected to the first high-voltage switch (9).

2. An emergency bypass device for a high voltage motor according to claim 1, wherein: the high-voltage power supply is characterized in that a first high-voltage contactor (11) is further connected to the motor (1) through a single-pole double-throw isolating switch (7), a second high-voltage frequency converter (3) is connected to the first high-voltage contactor (11), a second high-voltage contactor (12) is connected to the second high-voltage frequency converter (3), a second high-voltage switch (10) is connected to the second high-voltage contactor (12), and a second power bus (5) is connected to the second high-voltage switch (10).

3. An emergency bypass device for a high voltage motor according to claim 2, wherein: the motor (1) is further connected with a third high-voltage contactor (13) through a single-pole double-throw isolating switch (7), the third high-voltage contactor (13) is connected to the front of the second high-voltage contactor (12), and the third high-voltage contactor (13) is connected to a power frequency line (6).