CN201118248Y - Low-voltage withdrawable reactive power compensation device - Google Patents

Abstract

The utility model discloses a low-voltage draw-out type reactive power compensation device, which comprises a cabinet body. The cabinet is respectively provided with four parts: a control unit, a horizontal busbar row area, a vertical busbar row area, and a reactive power compensation switching unit. The control and reactive power compensation switching units are placed in corresponding drawers, and each drawer can be inserted or withdrawn from the front and rear sides of the cabinet at least, and connected to the vertical bus bar through connectors. The power compensation switching unit is connected to the power supply system through the vertical bus bar and the horizontal bus bar. The compensation is composed of dynamic compensation and static compensation. It can not only realize rapid installation and maintenance on site, but also easily expand or reduce capacity according to the capacity requirements of the reactive power compensation device, so as to achieve the purpose of high use efficiency.

Description

Low-voltage withdrawable reactive power compensation device

technical field

The utility model relates to a low-voltage draw-out type reactive power compensation device.

Background technique

The usual low-voltage reactive power compensation device includes a controller, a shunt switch, a special switch for switching capacitors, a capacitor, and a reactor (optional). Connection, occupying a large area, inconvenient device installation; it brings great difficulty and workload to the production workers who install or transform on site. Due to the inaccurate design of the location of the device, it also brings a lot of inconvenience to the user to expand the capacity; or the lack of reserved space, or the location design is unreasonable, which brings great inconvenience to the expansion of the low-voltage reactive power compensation device. difficulty.

In addition, there are still some defects in the structural strength and electrical performance safety of the low-voltage reactive power compensation device in the prior art.

Contents of the invention

The purpose of this utility model is to provide a low-voltage draw-out reactive power compensation device, which can not only realize rapid installation and maintenance on site, but also quickly adjust the compensation equipment by adjusting the number of compensation units according to the capacity of the reactive power compensation device. Capacity, in order to achieve the purpose of improving work efficiency.

In order to achieve the above object, the utility model takes the following design scheme:

A low-voltage withdrawable reactive power compensation device, including a cabinet frame composed of basic structural profiles and side panels, a control unit composed of a controller, an indicating instrument and a control switch, and a horizontal bus bar area are respectively installed in the cabinet , vertical bus bar area and reactive power compensation switching unit composed of molded case circuit breakers with breaking capacity, switching switches, optional reactors and capacitors; the control unit adopts the voltage and current signals of the power supply system to control the compensation unit switching; the reactive power compensation switching unit receives the control signal sent by the controller to provide the capacitive reactive power required by the system; the control unit is placed in the control unit drawer, and the reactive power compensation switching unit A group of reactive power compensation switching unit placed in the reactive power compensation switching unit drawer, the control unit drawer and reactive power compensation switching unit drawer can be inserted or pulled out at least from the front and rear sides of the cabinet , the control unit drawer and the reactive power compensation switching unit drawer are connected to the vertical bus bar through connectors, and each reactive power compensation switching unit is connected to the horizontal bus bar through the vertical bus bar and then connected to the power supply system.

The switching unit for reactive power compensation is at least one of dynamic compensation or static compensation switching unit.

Each pull-out drawer occupies a polyhedral space arranged according to the combination of modules, and the smallest unit space should be able to divide the space of the equipment installation area.

The control unit drawer is composed of a reactive power compensation controller, a display instrument and a control switch.

The capacitor-specific switching switches in the drawer of the reactive power compensation switching unit adopt contactors, contactless switches and compound switches respectively.

The reactive power compensation switching unit drawer can be connected to the vertical bus bar through a primary connector, and the electrical connection of the primary circuit can be realized through the bus bar connection of the vertical bus bar between the reactive power compensation switching unit drawers; The bus bar realizes the connection with the power supply system.

The utility model has the advantages of:

1. The overall structure is compact, and the floor space is small, only about one-third of the floor space of the fixed switch cabinet;

2. Modular building blocks, which can be combined with various capacities and branch numbers according to needs, save materials, save working hours, save energy, and are suitable for mass production;

3. Compared with existing technology products, it has higher cost performance, wider capacity selection range and more flexible capacity combination;

4. It can meet the safety requirements for personal, power system and equipment itself at the same time.

5. Due to the draw-out structure, maintenance is convenient. When the circuit drawer of this unit fails, the unit can be drawn out without affecting the operation of other switching units, avoiding economic losses caused by power outages, and its economic and social benefits. Very promising prospects.

Description of drawings

Figure 1 is a schematic front view of the structure of the low-voltage draw-out reactive power compensation device of the present invention

Figure 2 is the rear view of the utility model low-voltage draw-out reactive power compensation device

Figure 3 is a side view (section) of the low-voltage draw-out reactive power compensation device of the present invention

Figure 4 is a top view (section) of the utility model low-voltage draw-out reactive power compensation device

Figure 5 is a schematic diagram of the unit position of the low-voltage draw-out reactive power compensation device of the present invention

Detailed ways

As shown in Figures 1 to 5, the cabinet frame of the low-voltage withdrawable reactive power compensation device of the present invention is composed of basic structural profiles and side panels. The cabinet is respectively equipped with a control unit drawer 1, a horizontal busbar area 3, Vertical bus area 4, compensation unit drawer 2 four parts.

The control unit is composed of a controller, an indicating instrument and a control switch (the prior art), and is integrated in the control unit drawer.

The reactive power compensation switching unit is composed of a molded case circuit breaker with breaking capacity, a switching switch, a reactor (optional) and a capacitor (the prior art). The utility model divides it into a group of units, It is divided into a group of withdrawable reactive power compensation switching unit drawers, which can be inserted and withdrawn from the front and back of the cabinet respectively. The operating handle of the molded case circuit breaker and the breaking handle of the operating circuit breaker are installed on the front panel of the drawer. The hand can control the opening and closing of the molded case circuit breaker. When maintenance or failure occurs, the load of this drawer can be disconnected from the main bus without affecting the normal operation of other capacitor banks. The control unit drawer and the reactive power compensation switching unit drawer can be pushed into the frame of the cabinet by using the slideway, and connected with the vertical bus bar through the connector. The control unit drawer is the core part of the complete set of equipment. It adopts the voltage and current signals of the system to control the switching of the compensation unit drawer. The compensation unit drawer receives the control signal sent by the control unit drawer controller to provide the capacitive reactive power required by the system. . Compensation forms can be divided into dynamic compensation and static compensation.

As shown in Figure 1, the cabinet body of the low-voltage withdrawable reactive power compensation device of the utility model adopts a vertical installation structure, and the hexahedral space of the cabinet should be divided into three parts: the horizontal busbar area 3, the vertical busbar area 4, and the equipment installation area , each functional unit and equipment should be arranged in the specified area. Each zone forms a hexahedron space, and the sum of the three hexahedron spaces should be equal to the total space of the cabinet.

In terms of structural design, it should be considered to increase the space of the equipment installation area as much as possible, and make the most effective use of this space, so the equipment installation area designed by the utility model adopts a group of withdrawable functional units (a control unit drawer or no Power compensation switching unit drawer) combined and assembled, so that each functional unit occupies a hexahedral space arranged according to the modulus combination, the smallest unit space can divide the space of the equipment installation area, so that the most unit combinations can be obtained, that is, The largest combination of electrical solutions. The size of the spatial structure of each withdrawable functional unit can be consistent or different, but each should occupy a hexahedron space arranged in combination according to the modulus (M=80) on the structure.

The inner wall of thin-walled special-shaped steel pipe and the surface of doors and panels are coated with epoxy powder coating (complete) for better insulation. The metal surface must ensure its permanent conductivity. The protection level of the cabinet can reach IEC-144.IP40.

When the utility model is applied, the capacity of the compensation equipment can be quickly adjusted by adjusting the number of compensation units according to the capacity of the reactive power compensation device, and the capacity expansion or reduction can be easily realized according to the capacity requirements of the reactive power compensation device to meet the needs of different capacities .

By adopting the technical scheme, it is possible to realize the drawing-out building block combination configuration, and compared with the prior art products, it has higher cost performance, wider and more flexible capacity selection range.

Claims (7)

1. A low-voltage withdrawable reactive power compensation device, including a cabinet frame composed of basic structural profiles and side panels, and a control unit composed of a controller, an indicating instrument and a control switch, and a horizontal busbar are respectively installed in the cabinet Bar area, vertical bus bar area and reactive power compensation switching unit composed of molded case circuit breaker with breaking capacity, switching switch, optional reactor and capacitor; the control unit adopts the voltage and current signals of the power supply system to control Switching of the compensation unit; the reactive power compensation switching unit receives the control signal sent by the controller and provides the capacitive reactive power required by the system; it is characterized in that: the control unit is placed in the control unit drawer, and the The reactive power compensation switching unit adopts a group of reactive power compensation switching unit placed in the drawer of the reactive power compensation switching unit. The control unit drawer and the reactive power compensation switching unit drawer can at least Insert or withdraw from one side of the control unit drawer and reactive power compensation switching unit drawer are connected to the vertical bus bar through connectors, and each reactive power switching unit is connected to the horizontal bus bar through the vertical bus bar and then connected to the power supply system connect. 2. The low-voltage withdrawable reactive power compensation device according to claim 1, characterized in that each withdrawable drawer occupies a polyhedral space arranged according to the combination of modules, and the smallest unit space should be able to divide the equipment installation area Space. 3. The low-voltage withdrawable reactive power compensation device according to claim 1, characterized in that: said unit drawers are installed in the frame of the cabinet body through slideways. 4. The low-voltage withdrawable reactive power compensation device according to claim 1, characterized in that: the drawer of the reactive power compensation switching unit is closed around, and a busbar connector connected to the vertical busbar is installed behind the drawer. 5. The low-voltage withdrawable reactive power compensation device according to claim 1, characterized in that: the sampling and control output end of the controller is connected to the control loop through a bus connector. 6. The low-voltage withdrawable reactive power compensation device according to claim 1, characterized in that: the reactive power compensation switching unit is at least one of dynamic compensation or static compensation switching unit. 7. The low-voltage withdrawable reactive power compensation device according to claim 1, characterized in that: the front panel of each reactive power compensation switching unit drawer is equipped with an operating wrench for the molded case circuit breaker and a controllable circuit breaker branch. Suitable operating wrench.

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