Low voltage withdrawal switchgear XMCS-K

XMCS-K is a new type of low-voltage switchgear developed by our company to introduce advanced technology of foreign products, which is suitable for power distribution systems in power plants, petroleum, chemical industry, metallurgy, textile, high-rise buildings and other industries. In places with high degree of automation such as large power plants and petrochemical systems, which require computer interface, as a three-phase AC frequency of 50 (60) Hz, rated working voltage of 380V (400V), (660V), rated current of 4000A and below. Power distribution, motor centralized control, and reactive power compensation use low-voltage complete distribution devices.

performance index

The design of the device meets the following standards
IEC439-1 Low voltage switchgear and control equipment
GB7251 low voltage switchgear
ZBK360001 low voltage extraction switchgear

main structure

●The main frame adopts 8MF type open steel, and the two sides of the steel have installation holes with modulus of 20mm, 100mm and φ 9.2mm respectively, which is flexible and convenient for internal installation.
●The main frame assembly form is designed as two types, fully assembled structure and partial (side frame and beam) welded structure, for users to choose.
● The functional rooms of the device are isolated from each other, and the compartments are divided into functional unit rooms, bus rooms and cable rooms. The functions of each room are relatively independent;
● The ice-flat main busbar adopts the flat arrangement mode behind the cabinet to enhance the ability of the busbar to resist electric power, which is the basic measure to make the main circuit of the device have the ability of high short-circuit strength;
The design of the cable compartment makes it very convenient for cables to enter and exit up and down.
The size of the general cabinet for the installation (see the table below)

functional unit

● The modulus of the drawer floor height is 160mm. It is divided into 1/2 unit, 1 unit, 3/2 unit, 2 unit, 3 unit, and five size series. The rated current of the unit circuit is 400A and below;
● The drawer changes only in height and size, and its width and depth dimensions remain unchanged. Drawers of the same functional unit have good interchangeability;
● Each MCC cabinet can be installed with up to 11 one-unit drawers or 22 1/2-unit drawers. More than one unit of drawers adopts a multi-functional rear plate;
● The inlet and outlet lines of the drawer adopt plugins of the same specification chip structure with different numbers of pieces according to the current;
● The transfer between the 1/2 unit drawer and the cable room adopts the ZJ-2 type adapter of the back plate structure;
● The unit drawer and the cable compartment are connected by the same size rod or tube structure ZJ-1 adapter according to the current;
● The drawer unit is equipped with a mechanical interlock device.


Main electrical components

The principle of selecting main electrical components is based on imported technology, which can be mass-produced in series in China and meet the requirements of high performance of the device.
● The main choice of power supply and feeder unit circuit breaker is AH series. Other more advanced performance M series produced by Schneider company and F series produced by ABB company can also be selected. AH type circuit breaker has the characteristics of good performance, compact structure, light weight and strong seriality. The price is relatively low, the maintenance and use are convenient, and the performance indicators can meet the requirements of this device;
● Drawer unit (motor Control Unit, part of the feed unit) circuit breaker main selection CM1, TG, TM30 series molded case circuit breaker. These switches have good performance, compact structure, short arc or no arc, technology
The characteristics of high technical and economic indicators can meet the requirements of this device;
● Isolation switch and fuse type isolation switch choose Q series. This series has high reliability, strong breaking capacity, and can realize mechanical interlocking;
● Fuse main selection NT series;
AC contactor selection B series, LC1-D series.

Device features

Increase the heat capacity of the adapter and greatly reduce the additional temperature rise caused by the temperature rise of the adapter to the connector, cable head and spacer.
The separation between functional units and compartments is clear and reliable, and the failure of one unit does not affect the work of other units, limiting the failure to a minimum.
The busbar flat arrangement makes the device have good dynamic and thermal stability, and can withstand the impact of 80/176 kA short-circuit current.
● The number of circuits in a single cabinet of MCC cabinets is as large as 22 times, fully considering the needs of automated electric door (machine) groups in industries such as large single-unit capacity power generation and petrochemical systems;
● The connection between the device and the external cable is completed in the cable compartment, and the cable can enter and exit up and down. The current transformer is installed in the cable compartment, which makes installation and maintenance convenient;
● The same power distribution system can limit the short-circuit current through limited viewership of reactor matching, stabilize the bus voltage at a certain value, and partially reduce the requirements for short-circuit strength of components;
The drawer unit has a sufficient number of secondary connectors (32 pairs for 1 unit and above, 20 pairs for 1/2 unit), which can meet the requirements of the number of docking points for computer interfaces and automatic control circuits.

Auxiliary circuit

The design of the auxiliary circuit diagram conforms to the "Technical Regulations for Power Design of Thermal Power Plants" and other relevant design technical regulations. It is suitable for low-voltage power plant (premises) power systems in power plants and substations, and low-voltage power distribution systems in factories, mines and high-rise buildings.
The auxiliary circuit scheme is designed according to the main circuit scheme, which is divided into functional units controlled by power input, feeder (PC) and motor feeder (MCC).


Installation and use

After the product arrives at the receiving place, it should first check whether the packaging is complete and intact. If any problems are found, the relevant departments of the contract should be notified in time to make business records, jointly analyze the reasons, and make visa and aftercare treatment. For products that are not installed immediately, they should be placed in an appropriate place according to the normal conditions of use and the requirements of the temporary storage procedures for electrical equipment, and they should be properly kept.
1. The installation of the product should be carried out according to the installation schematic diagram (see attached drawings). The basic channel steel and the bolts when the bolt fixing method are provided by the user. When the main busbar is connected, if the surface is uneven due to transportation and storage, it needs to be flat before connecting and fastening;
2. When the device is installed alone or in a row, its verticality, as well as the deviation of the unevenness of the cabinet surface and the gap between the cabinets, shall comply with the provisions of the following table.

3. Inspection and inspection before the product is installed and put into operation
Check whether the cabinet topcoat or other covering materials (such as plastic spraying) are damaged, and whether the cabinet is dry and clean.
The operating mechanism of the electrical components is flexible, and there should be no sticking or excessive operating force.
Whether the on-off of the main and auxiliary contacts of the main electrical appliances is reliable and accurate;
Drawer or pull-out mechanism should be flexible, lightweight, and free of jamming and collision.
● The centerline of the moving and static contacts of the drawer or drawer structure should be the same, and the contact contact should be tight. The insertion depth of the main and auxiliary contacts should meet the requirements. Mechanical interlocking or electrical interlocking devices should operate correctly, locking or
Release should be reliable.
Drawers of the same size should be easily interchangeable without jamming or collision.
The ground contacts between the drawer and the cabinet should be in close contact. When the drawer is pushed in, the ground contacts of the drawer contact first than the main contacts, and when pulled out, the ground contacts are disconnected after the main contacts.
The scale setting of the instrument, the ratio and polarity of the transformer should be correct.
The fuse core specification of the fuse should meet the requirements of the engineering design.
The rated value and setting of protection should be correct and reliable.
● Use a 1000V megohm meter to measure the insulation resistance value shall not be less than 1MΩ;
The connection of each busbar should be good, and the installation of insulating supports, mounting parts and other accessories should be firm and reliable.
4. Precautions for use
1) The device is a low-voltage distribution cabinet that is not installed against the wall, operated on the front, and repaired on both sides. The maintenance channel and cabinet door of the cabinet must be entered or opened by qualified professionals for operation, inspection and maintenance.
2) Air circuit breakers and molded case circuit breakers have been divided and combined for many times, especially after short-circuit division and combination, which will cause local burns on the contacts and produce carbon substances, which will increase the contact resistance. They should be carried out according to the instruction manual of the circuit breaker
Maintenance and overhaul.
3) After installation and maintenance, the isolation between compartments and functional units must be strictly checked to ensure good functional separation of the device and prevent the failure from expanding.

Product package

The manufacturer shall provide the following documents and attachments when supplying goods:
Device List
● Product certificate
● Instruction manual
● Factory test report
● Electrical drawings
● Cabinet door keys, operating handles and spare parts stipulated in the contract
● Installation and operation instructions for main components

基本参数