GCK withdrawable switch cabinet

Purpose
The device is suitable for power conversion, distribution and control of power, distribution and motor control centers, capacitance compensation, etc. in low-voltage distribution systems such as power plants, substations, petrochemical departments, factories and mines, high-rise buildings, etc. use.
It can meet the special needs of computer interfaces in power usage occasions such as power plants with large single-machine capacity and low-voltage power control centers and motor control centers in large-scale petrochemical industries.
The device is based on the requirements of the Ministry of Electric Power, the majority of power users and the design department. In order to meet the needs of the continuously developing power market for capacity expansion, computer interfaces, centralized power control, convenient installation and maintenance, and shortened accident handling time, the device is based on the A new type of low-voltage withdrawable switch cabinet designed on the principles of safety, economy, reasonableness and reliability. The product has the characteristics of segmentation, high connection capacity, good dynamic and thermal stability, flexible electrical scheme, convenient combination, strong serialization and practicality, novel structure and high protection level. It can be used as a replacement product for low-voltage withdrawable switch cabinets.
The device complies with the standards of "Low-voltage complete switchgear and control equipment", "Low-voltage complete switchgear", "Low-voltage withdrawable complete switchgear" and other standards.
2. Product usage environment
The ambient air temperature should not be higher than +℃ and not lower than +℃. The average temperature within an hour shall not be higher than +°C. If it exceeds, the capacity must be reduced according to the actual situation.
For indoor use, the altitude of the place of use shall not exceed.
The relative humidity of the surrounding air should not exceed when the maximum temperature is +℃. A larger relative humidity is allowed at lower temperatures, such as +. It should be considered that the impact of condensation may occasionally occur due to temperature changes. .
During installation, the inclination with the vertical plane does not exceed the angle, and the entire cabinet row is relatively flat (in compliance with standards).
The device should be installed in a place where there is no severe vibration and impact and where the electrical components are not subject to undue corrosion.
When customers have special requirements, they can negotiate with the manufacturer.
3. Main technical parameters
Basic electrical parameters
Rated insulation voltage AC
Rated operating voltage main circuit AC
Auxiliary circuit AC
DC
Rated frequency
Horizontal bus rated current
Vertical bus rated current
Rated peak withstand current
Rated short-time withstand current
Branch bus rated current
Four , Main circuit plan
The main circuit plan of the device consists of a total of 1 specifications, excluding plans and specifications derived from changes in the control and protection of the auxiliary circuit.
The main circuit plan is compiled after soliciting opinions from the design, manufacturing, testing and usage departments. It includes the needs of power generation, power supply and other power users. The rated operating current is, suitable for configurations up to and below Electric transformer selection.
In addition, the capacitor compensation cabinet is designed to meet the needs of power supply and consumption to improve the power factor, and the reactor cabinet is designed taking into account the needs of comprehensive investment (main circuit plan diagram is attached)
Auxiliary circuit plan
The auxiliary circuit diagram is compiled according to relevant design requirements. There are a total of auxiliary circuit plans, divided into two volumes. There are two solutions in the first volume (AC operation part), and there are three solutions in the second volume (DC operation part).
The auxiliary scheme of the DC operation part is mainly used for low-voltage plant (station) systems in power plant substations. When formulating, it has been taken into account that it is suitable for low-voltage plant systems of units with capacity below and above, working (standby) General control methods for power incoming wires, power feeders and motor feeders.
The auxiliary solutions for AC operation are mainly used in low-voltage systems of factories, mining enterprises and high-rise building substations. During the compilation, a combination scheme suitable for the operation control of the transformer power incoming line was selected. It is also equipped with control electrical circuits such as operating electrical interlocking backup self-turning and self-resetting. It can be used directly in engineering design.
The DC control power supply is DC or AC, the AC control power supply is AC or AC, and it is a complete cabinet composed of drawer units. The control power supply is derived from the public control power supply supplied by a dedicated control transformer in this cabinet. The public control power supply uses an ungrounded method to control the transformer, leaving power available for use when weak current signal lights are needed.
Please refer to the "Preparation Instructions" of the auxiliary circuit diagram for the installation location of the watt-hour meter, the introduction method of the voltage and other installation and use requirements.
Busbar
In order to improve the dynamic thermal stability of the busbar and improve the contact surface Temperature rise, the device all uses a series of hard copper bars. The connection part of the copper bar must be tinned. It is recommended to use full-length tinned. Full-length silver-plated copper busbars are also available.
Horizontal busbar
The horizontal busbar is placed in the busbar compartment at the rear of the cabinet. It is a double-layer arrangement above and above, and a single-layer layout below. Each phase is composed of strips or busbars, which greatly improves the efficiency of the busbar. short circuit strength.
The following table is used to select the copper bar for the installation horizontal busbar
Rated current copper bar specifications
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Vertical busbar
Terms The vertical busbar of the drawer cabinet adopts ∟-shaped hard copper and tin-lined busbar.
∟ shaped busbar specifications
(high thickness) + (bottom thickness)
+
rated current.
Neutral ground bus
Use hard copper bar
Through the horizontal neutral ground wire or ground + neutral wire (+) specifications are as shown in the table
*Vertical first + first in the device All specifications are selected
6. Selection of main electrical components
The device mainly uses electrical components with advanced technical performance indicators that can be mass-produced in China.
Main switch
For power incoming and feeder switches of and above, the main selection series can also be used, series, series, or series. When deemed necessary, imported series or series can also be used.
The following switches for feeder and motor control mainly use series, series, plastic case switches. You can also choose series, series molded case circuit breakers.
AC contactors mainly use series and series contactors as well as matching thermal relays and interlocking mechanisms.
All current transformers adopt series, series, series.
The fuses are selected from the knife fuse series with high breaking capacity.
In order to improve the dynamic stability of the main circuit, a series of dedicated combined busbar clamps and insulating supports are designed, which are thermoformed from high-strength, flame-retardant synthetic materials, with high insulation strength and good self-extinguishing performance. The structure is unique and can be used for busbars of different specifications by simply adjusting the modular blocks.
In order to reduce the temperature rise of the partition board, connector and cable head of the functional unit, a cabinet-specific adapter is designed. Compared with similar products, the heat capacity of the adapter is increased and the temperature rise is reduced.
If the design department selects new electrical components with better performance and more advanced technology based on user needs, since the series cabinets have good versatility, there will be no manufacturing and installation difficulties caused by newer electrical components.
7. Structural Features
The structure of the device is made of steel or aluminum-zinc plate. The structure adopts two structural forms: assembly and partial welding. There are mounting module holes on the main frame.
The functional rooms of the device are strictly separated. The compartments are mainly divided into functional unit rooms, busbar rooms, and cable rooms. The functions of each unit are relatively independent.
The device does not adopt the traditional design of placing the horizontal busbar on the top of the cabinet, so that there are outlet channels above and below the cable room. It solves the problem that old products cannot be installed.
The dimensions of the cabinet are as shown in the table above
Height, width and depth

Functional unit
A drawer is an independent functional unit.
The drawers are divided into four size series: one-half unit, one unit, two units, and three units. The circuit current is up to and below. The dimensions of a unit drawer are (height) (width) (depth) and half the width of a unit drawer. The second and third units only double or triple the height, and the other dimensions are the same unit.
The drawers of functional units can be easily interchanged.
Each cabinet of the device can be equipped with a drawer of one unit or a drawer of half a unit.
The drawer inlet and outlet wires are selected according to the size of the loop current. The same number of chip connectors of the same standard are used, generally one piece of connector
The connection between the half drawer and the cable adopts a backplate structure adapter. The connection between the unit drawer and the cable room adopts a rod type The adapter of the structure.
The drawer panel has obvious signs for closing, breaking, testing, withdrawing and other positions, and the drawer is equipped with a mechanical interlocking device.
The feeder cabinet and motor control cabinet are equipped with dedicated cable partitions room, the connection of the cables in the functional unit room and the cable compartment is realized through an adapter or an adapter copper bar, which not only improves the reliability of the cable, but also greatly facilitates the installation and maintenance of the cable by the user. The cable room has two Width sizes (and) are available for selection, depending on the number of cables, cross-section and the user's requirements for convenient installation and maintenance.
The number of auxiliary contact pairs of functional units of the device is one unit or more, and /unit is Yes, it can meet the needs of automation users and computer interfaces.
Taking into account the commonness and safety of dry-type transformers and the economy of oil-immersed transformers, the device can easily form a group with dry-type transformers .It can also be easily connected to the low-voltage busbar of an oil-immersed transformer.
With drawer as the main body, it has both withdrawable and fixed types, which can be mixed and combined for any selection.
The device is based on three-phase four-wire system or three-phase Five-wire design, the design department and users can conveniently choose or
+ mode.
The protection level of this switch cabinet is, and can be selected according to user needs.