Novel high-power medium-voltage soft start cabinet

Abstract

The utility model discloses a novel high-power medium-voltage soft start cabinet, which comprises a voltage transformer, a current transformer and a lightning arrester, a bus chamber is arranged on the left side of the upper portion of the cabinet body, a relay chamber is arranged on the right side of the upper portion of the cabinet body, a middle chamber is arranged below the relay chamber, a high-voltage vacuum circuit breaker is installed in the middle chamber, and a medium-voltage thyristor valve assembly is installed under the middle chamber. A voltage transformer and a current transformer are installed in a bus chamber, a high-voltage vacuum contactor is installed under the bus chamber, a zero-sequence current transformer is further installed below the rear portion of the high-voltage vacuum contactor, and the zero-sequence current transformer is installed on the wire outlet side of the soft start cabinet. A wire of the high-voltage motor penetrates through the zero-sequence current transformer and is installed on the soft starting cabinet outlet copper bar, and the lightning arrester is installed on a lower opening of the high-voltage vacuum circuit breaker. According to the utility model, through the reasonable internal layout, the cabinet combination with a medium-voltage incoming and outgoing line cabinet can be conveniently realized through a wall-through bus in the field of medium-voltage power distribution, the complexity of field installation and construction is greatly simplified, and the cable construction cost is saved.

Description

Technical Field

[0001] The utility model relates to a novel high-power medium-voltage soft starting cabinet, belonging to the technical field. Background Art

[0002] With the development of modern industry, my country's economy has entered a new stage. There are more and more large-scale equipment and large-scale enterprises. In the metallurgical, mining, power generation and other industrial fields, high-power power equipment is often needed. In order to reduce energy consumption, high-power power equipment has become more and more mature in the direction of medium-voltage (6KV / 10KV) motor technology this year. When the medium-voltage high-power motor is started, the grid voltage will suddenly drop sharply; therefore, people's demand for starting large motors is particularly prominent. Combined with the promotion and application of various related soft starter cabinets, the demand for new soft starter cabinets that are convenient for cabinet connection is particularly urgent.

[0003] In the 1980s and 1990s, the strength of my country's heavy industry, metallurgy, electric power and other industries was still relatively weak, and the power requirements for motors were maintained between 10kw and 40kw. At that time, the liquid soft starter that matched this economy developed rapidly. The liquid soft starter was economical and applicable, and could meet the basic needs of the industry at that time. It did solve many problems and brought a lot of convenience. As the power of high-power motors became larger and larger, and the voltage level became higher and higher, the performance of the liquid starter hindered the capacity of the motor to a certain extent. Therefore, people began to study thyristor soft starters to meet the needs of motor capacity. Therefore, a new type of high-power medium-voltage soft starter cabinet came into being; Utility Model Content

[0004] The purpose of the utility model is to provide a novel high-power medium-voltage soft start cabinet to solve the problems raised in the above background technology.

[0005] To achieve the above purpose, the utility model adopts the following technical solutions:

[0006] A new type of high-power medium-voltage soft-start cabinet comprises a voltage transformer, a current transformer, a relay room, a high-voltage vacuum circuit breaker, a thyristor valve assembly, a zero-sequence current transformer, a high-voltage vacuum contactor and a lightning arrester; the upper left side of the cabinet is a busbar room, the upper right side of the cabinet is a relay room, a middle room is below the relay room, a high-voltage vacuum circuit breaker is installed in the middle room, and a medium-voltage thyristor valve assembly is installed directly below the middle room; a voltage transformer and a current transformer are installed in the busbar room, a high-voltage vacuum contactor is installed directly below the busbar room, a zero-sequence current transformer is also installed at the rear lower part of the high-voltage vacuum contactor, and the zero-sequence current transformer is installed on the outlet side of the soft-start cabinet; the wire of the high-voltage motor passes through the zero-sequence current transformer and is installed on the outlet copper bus of the soft-start cabinet, and the lightning arrester is installed at the lower end of the high-voltage vacuum circuit breaker.

[0007] Preferably, a bolt-mounted lightning arrester is used, and the installation position does not occupy the space of other electrical components.

[0008] Preferably, the soft start cabinet adopts side busbar connection and cabinet connection or uses cable connection as an independent cabinet for line entry and outgoing line.

[0009] Compared with the prior art, the beneficial effects of the present invention are as follows: through reasonable internal layout, the present invention can be conveniently connected with medium-voltage incoming and outgoing line cabinets through wall-penetrating busbars in the medium-voltage power distribution field, which greatly simplifies the complexity of on-site installation and construction and saves cable construction costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] Figure 1 This is the overall structure diagram of the utility model;

[0011] In the figure: 1 voltage transformer, 2 current transformer, 3 relay room, 4 high-voltage vacuum circuit breaker, 5 thyristor valve assembly, 6 zero-sequence current transformer, 7 high-voltage vacuum contactor, 8 lightning arrester. DETAILED DESCRIPTION

[0012] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention.

[0013] A novel high-power medium-voltage soft-start cabinet comprises a voltage transformer 1, a current transformer 2, a relay chamber 3, a high-voltage vacuum circuit breaker 4, a thyristor valve assembly 5, a zero-sequence current transformer 6, a high-voltage vacuum contactor 7, and a lightning arrester 8; the upper left side of the cabinet is a busbar chamber, the upper right side of the cabinet is a relay chamber 3, and the lower part of the relay chamber 3 is a middle chamber, in which a high-voltage vacuum circuit breaker 4 is installed, and a medium-voltage thyristor valve assembly 5 is installed directly below the middle chamber; a voltage transformer 1 and a current transformer 2 are installed in the busbar chamber, a high-voltage vacuum contactor 7 is installed directly below the busbar chamber, a zero-sequence current transformer 6 is also installed at the rear lower part of the high-voltage vacuum contactor 7, and the zero-sequence current transformer 6 is installed on the outlet side of the soft-start cabinet; the wire of the high-voltage motor passes through the zero-sequence current transformer 6 and is installed on the outlet copper bus of the soft-start cabinet, and the lightning arrester 8 is installed at the lower end of the high-voltage vacuum circuit breaker 4.

[0014] The bolt-mounted arrester 8 is installed at a position that does not occupy the space of other electrical components. The soft start cabinet has side busbar and cabinet connection or uses a cable as an independent cabinet for line entry and outgoing line.

[0015] A high-voltage vacuum contactor 7 is installed directly below the busbar room. When the soft-start cabinet is started, the bypass contactor is energized and the soft-start thyristor valve assembly exits the working state. At the same time, a zero-sequence current transformer 6 is installed at the rear and lower part of the high-voltage vacuum contactor as the outlet position of the motor line.

[0016] Through reasonable internal layout, the utility model can be conveniently connected with medium-voltage incoming and outgoing line cabinets through wall-penetrating busbars in the medium-voltage power distribution field, which greatly simplifies the complexity of on-site installation and construction and saves cable construction costs.

[0017] The above is a preferred embodiment of the present invention. For ordinary technicians in this field, according to the teachings of the present invention, without departing from the principles and spirit of the present invention, changes, modifications, substitutions and variations made to the implementation methods are still within the scope of protection of the present invention.

Claims

1. A new type of high-power medium-voltage soft start cabinet, characterized in that: It includes voltage transformer, current transformer, relay room, high-voltage vacuum circuit breaker, thyristor valve assembly, zero-sequence current transformer, high-voltage vacuum contactor and lightning arrester; the upper left side of the cabinet is the busbar room, the upper right side of the cabinet is the relay room, and the middle room is below the relay room. The high-voltage vacuum circuit breaker is installed in the middle room, and the medium-voltage thyristor valve assembly is installed directly below the middle room; voltage transformer and current transformer are installed in the busbar room, high-voltage vacuum contactor is installed directly below the busbar room, and zero-sequence current transformer is also installed at the rear and lower part of the high-voltage vacuum contactor. The zero-sequence current transformer is installed on the outgoing side of the soft starter cabinet; the wires of the high-voltage motor pass through the zero-sequence current transformer and are installed on the outgoing copper busbar of the soft starter cabinet, and the lightning arrester is installed at the lower end of the high-voltage vacuum circuit breaker.

2. A novel high-power medium-voltage soft start cabinet as claimed in claim 1, characterized in that: The bolt-mounted lightning arrester is installed in a location that does not occupy the space of other electrical components.

3. A novel high-power medium-voltage soft start cabinet as claimed in claim 1, characterized in that: The soft start cabinet adopts side busbar and cabinet connection or cable entry as an independent cabinet.

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