Low-Voltage Distribution Cabinets – RShNN
to 1000 V,AC with a frequency of 50 Hz
- Description
- Specifications
- Symbol
- Structural design
- Environmental durability requirements
- Transportation of equipment
- Photo
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Description
Low-voltage distribution cabinets (hereinafter referred to as LVDC) are designed for completing switchgears of up to 1000 V,AC with a frequency of 50 Hz, which are used for receipt and distribution of electric energy, protection against overloads and short-circuit currents, as well as for electric energy metering and accounting.
Specifications
| Parameter designation | Parameter value |
|---|---|
| High-voltage (HV) side rated voltage, kV | 0,4; 0,69 |
| Rated current of main circuits, A | 630; 1000; 1600; 2500; 3200; 4000 |
| Rated breaking current of the chamber SUM with vacuum circuit breaker, kA | 220 |
Symbol structure
LVDS – low-voltage distribution switchboards
LVDC is low-voltage distribution cabinet manufactured by Chelyabinsk Electric Equipment Plant LLC
Servicing condition:
- 2 – bilateral maintenance;
- omitted when unilateral
Automatic circuit breakers design:
- 1 – unit-mounted;
- 2 – carriage-type
Rated voltage, kV
Rated current, A
Climatic modification and placement category according to GOST15150-69
Structural design
LVDC housing is a metal structure made of sheet rollformed sections. The housing components manufacturing process starts in the design engineering department, then the drawings are sent to the laser machine shop where future housing parts are being cut from sheet metal. Upon completion of the cutting process, fabricated materials are sent to the bending machine, and then welding and surface preparation for powder coating occur. Metal thickness of the housing parts varies from 1 to 5 mm.
LVDC housing design provides the possibility of the cabinet conventional separation into local switch compartment, transversal coupling compartment, relay protection and automation (RPA) compartment and outgoing switching devices compartment. Automatic circuit breakers and unit-mount/withdrawable load-break switches can be installed as leading-in and sectional devices. Outgoing lines are provided with automatic circuit-breakers or disconnecting switches with fuses. LVDC are made as for unilateral maintenance and consists of two cabinets (each cabinet is a separate section). LVDC cabinets can be installed by sections in one or two adjacent rooms. If
LVDC cabinets are located in different rooms, sectionsare interconnected by the busbar bridge or cable, depending on the customer’s preferences. The busbar bridge dimensions and cable length are determined by the equipment layout in the room.
Environmental durability requirements
LVDC are operated in the electrical equipment rooms at any time in a 24-hour period in all weather and seasons, and have the following resistance characteristics against environmental factors:
- ambient air temperature – from -25 to +40°С;
- elevation above the sea level – 1000 m, max.;
- relative air humidity – 75 % at temperature of +15°С;
- atmospheric pressure – from 86.6 to 106.7 kPa;
- atmosphere type as per GOST 15150 – II (industrial);
- environment – non-explosive, free of explosive dust and aggressive gases which concentrations can destroy metals and insulation;
- seismic impact resistance as per GOST 17516.1 – up to 9 points on MSK-64 scale.
Transportation of equipment
By default, LVDC are packed into bubble wrap. Special heat-shrink tape is used if required.
LVDC are transported as a separate cabinets or transport blocks.
LVDC are transported:
- by railroad transport;
- by vehicular transport;
- by river transport.