1. Ambient temperature: the ambient air temperature does not exceed +40°C and does not fall below -5°C, and its average temperature does not exceed +35°C within 24 hours.?

2. Ambient humidity: the air is clean, and its relative humidity does not exceed 50% at the temperature of +40℃, and a higher relative humidity is allowed at lower temperatures. For example, 90% at +20°C and up to for short periods at +25°C; however, moderate condensation may occur occasionally due to temperature changes.?

3. a temperature range between -25 °C and +55 °C is suitable for transport and storage processes, up to +70 °C for short periods (≤ 24h).?

4. Altitude not exceeding 2000 meters.?

5. Earthquake intensity does not exceed 8 degrees.?

6. Environmental pollution level: level 3.?

7. When the use conditions are not to the above working conditions, the user will propose to the manufacturer and negotiate a solution.

Electrical parameters

Enclosure protection:?
1. Switchgear enclosure protection level: standard enclosure is IP54, and IP31, IP33, IP4X can be selected according to needs,?

IP41, IP43, IP5X, IP54.?

2. When selecting a higher level of protection, it is necessary to consider the capacity reduction of the switchgear due to reduced heat dissipation.

3. The enclosure protection of the drawer unit is to the requirements of product selection when the drawer is connected, tested, and in the main switch closing or opening position. When the drawer unit is in the removed position, the protection level between the compartment and the hazardous live parts is

IPXXB.

4. The partitioning of the compartments in the switchgear cabinet meets the requirements of IEC 439-1, 3, or 4, and the protection class between the compartments meets the requirements of IP2X.

According to the use of the switchgear cabinet can be assembled into a variety of cabinet structures and functional unit frame structure can be divided into the following cabinet types:

1. PC Cabinet: Mainly installed with frame-type circuit breakers or large-capacity knife-fused switches, generally used for incoming switchgear and high-current distribution outlet cabinets. (Figure 2) Depending on the switching capacity and size requirements, PC cabinets can have various widths. Various types of frame-type circuit breakers or knife-fused switches can be installed in the PC cabinet, and 1 to 3 sets of frame-type circuit breakers can be installed as required. When two frame circuit breakers are installed, a left-right arrangement is usually used. Left-right arrangement, the cabinet width is increased compared with the upper and lower arrangement, but compared with the upper and lower arrangement, the heat dissipation conditions are better, and it is better than the upper and lower arrangement in the case of long-term full-load operation. Horizontal busbar cabinet rear arrangement, when the rated current ≥ 4000A, the busbar cabinet must increase the 400mm wide busbar transfer cabinet or busbar bridge transfer; horizontal busbar cabinet top arrangement, when the rated current > 3200A, the busbar cabinet must increase the 300mm ~ 400mm wide busbar transfer cabinet.

2. MCC cabinet: mainly installed with molded case circuit breakers, contactors, thermal relays, or small-capacity knife-fused switches, generally used in motor control centers or small-current distribution centers. There are two types of outlets: cabinet side outlet and cabinet rear outlet.

3. Mixed PC and MCC cabinets: The switchgear is partly for PC circuits and partly for MCC circuits. Using a mixed structure improves the installation efficiency of the cabinet components and reduces the number of switchgear. In general, it is recommended to separate the PC and MCC, and to locate the frame circuit breakers and drawer units in different cabinets for ease of use and maintenance; however, under special circumstances, it is permitted to mix the PC and MCC. In case of mixed installation, the PC should be placed in the upper part of the cabinet, the drawer unit should be arranged in the lower part, and there should be a space of 8E between the PC and the drawer unit for the transfer of vertical busbars. For details, refer to the primary program.

4. Reactive power compensation cabinet: mainly installing low-voltage power capacitors and corresponding control circuit, used for low-voltage reactive power compensation of the system. Depending on the equipment in use, automatic reactive power compensation cabinets are designed to compensate for the reactive power of the grid with approximate sinusoidal waveforms and the reactive power supplied by rectifiers and equipped with filtering circuits.

To ensure optimum installation procedures and quality, specially trained or specialized personnel should be responsible for guidance and supervision at the site and carry out the corresponding work according to these instructions.?

Before installing the switchgear, the civil works in the distribution room must be completed and accepted, and be equipped with a power supply and ventilation for lighting and installation. The distribution room should be dry, clean, air-conditioned, with a lockable door, and with holes through the walls and cable trenches made in advance. The ceiling height of the distribution room should not be less than 3000mm above the ground, and the conditions of all the distribution rooms must ensure that they meet the prescribed environmental conditions for the normal use of the indoor switchgear.

For the switchgear cabinet, when the side cable outlet is used, all the installation, commissioning, and maintenance are carried out at the front side, and it can be installed against the wall to save floor space; when the rear cable outlet is used, since the installation and maintenance of the cable need to be carried out at the back of the cabinet, the cabinet is designed to be installed away from the wall. However, generally speaking, if the floor space of the distribution room permits, it is better to design the layout of the distribution room with the switchgear not being installed against the wall, so that the appropriate channel can be left between the cover plate of the switchgear to the partition wall as well as between the two sides of the switchgear to the partition wall so that it is easier for installation, maintenance and fire fighting.


Ordering Information

When the switchgear is ordered, the user should provide the following information:

Primary line scheme and single line system diagram, data on the purpose of the system, rated voltage, rated current, rated short circuit breaking current, etc;

Arrangement diagram of switchgear and plan layout of distribution room;

Specifications of incoming and outgoing cables;

Detailed models, quantities, and specifications of all kinds of electrical equipment to be assembled inside each switchgear cabinet, names, models, and quantities of other accessories, and list of equipment to be issued;

Secondary circuit unfolding diagram;

Other special requirements such as cabinet color.


Shape and mounting dimensions

Base on switchroom floor: When the number of switchgear is small and the weight is light, it can be mounted directly on the floor of the switchroom. It is required that the floor at the installation is very flat and has sufficient load-bearing capacity. If required, shims can be inserted underneath the switchgear during installation adjustments.