Air Insulated Switchgear
Series 203, 292, 285, 212, 205, up to 10 kV
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Description
Chambers SUM of Series 200 are designed for operation in 3-phase 50 Hz and 60 Hz, 6 kV and 10 kV rated AC voltage electric installations for a system with a neutral insulated or earthed via arc suppression coil, in moderate (N) climate, placement category 3 according to GOST 15150.
Switchgears (SG) used for electric power receipt and distribution are assembled from the chambers SUM. Their operation principle is determined by acircuitryof the main and auxiliary chamber circuits.
Specifications
| Parameter designation | Parameter value |
|---|---|
| High-voltage (HV) side rated voltage, kV | 6; 10 |
| High-voltage (HV) side maximum operating voltage, kV | 7,2; 12 |
| Rated current of main circuits, A | 400; 630; 1000; 1600; 2000 |
| Rated breaking current of the chamber SUM with vacuum circuit breaker, kA | 20; 31,5 |
| Rated breaking current of the chamber SUM with load-break switch, A | 630 |
| Short-time thermal current (3 s) | 20; 31.5 |
| Rated voltage of auxiliary circuits, V: – AC and DC protection, control and alarm circuits – voltage measuring transformers circuits – lighting | 220 100 36 |
Symbol structure
SUM – switchgear of unilateral maintenance manufactured by Chelyabinsk Electric Equipment Plant LLC
Modification: 203; 292; 285; 212; 205
Main circuits diagram part No.
Switching device type:
- В – vacuum circuit breaker;
- Э – SF6 circuit breaker
Switching device:
- 2 – draw-out;
- omitted when stationary
Rated current, A (630; 1000; 1600; 2000)
Manufacturer: Ч – Chelyabinsk Electric Equipment Plant
Climatic modification and placement category according to GOST15150-69
Design classification
| SUM classification attributes | Design |
|---|---|
| Insulation level according to GOST 1516.1 | chambers SUM with normal (standard) insulation |
| Insulation type | Air insulation |
| Busbar insulation | With non-insulated buses;With insulated buses |
| Design of high-voltage lead-in lines | with cable connection(s);With bussed connection |
| Servicing conditions | With unilateral maintenance |
| In terms of climatic modifications and placement category | Placement category 3, climatic modification N according to GOST 15150, GOST 15543.1 |
Structural design
The chamber SUM 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. Equipment of the chamber SUM main and auxiliary circuits is located inside the chamber. Handles of driving units and control switches are arranged at the front. Protection, control and alarm relays, metering and accounting instruments can be installed both in the relay protection and automation (RPA) compartment and on the front side/ inside of the door of the chamber SUM. Doors located on the SUM chamber front side, provide access to the main equipment. The number of doors depends on the SUM design features and its modification.
Provisions are made in the chamber SUM design for separation of the compartment with auxiliary circuits devices from high-voltage equipment. Also the chamber SUM provides the possibility of cable assembly compartment separation from the vacuum circuit breaker compartment by means of a fixed metal partition. Depending on the modification and design version, the partition used for collecting buses compartment separation from the vacuum circuit breaker compartment can be made as follows: fixed,demountable (made of non-conducting material) or be absent. Interior lighting of 36 V is provided in the chambers SUM.
All the devices and instruments installed in the chamber SUM which shall be earthed, are connected to earth. In the event of auxiliary circuits devices installation, top door shall be earthed by a flexible wire. Two earthing points intended for the chamber SUM housing connection to earthing device and for temporary earth arrangement, are located at the bottom of the chamber SUM front side. The chamber SUM frame is welded directly to earthed metal structures. Metal-on-metal connection of all the chamber SUM parts is accomplished through the use of cut-in washers in bolted connections.
Duct, located in the middle or upper part of the chamber SUM (depending on modification), acts as a channel for backbone buses of the closing solenoids operative power supply circuits, control and alarm circuits.
The following locks are activated to avoid erroneous actions during routine switching, maintenance and repair in the chambers SUM:
- lock preventing line- and bus-isolating switches switching on and off when the high-voltage circuit breaker is activated;
- lock preventing earthing blades switching on when the disconnecting switch operating blades are activated;
- lock preventing disconnecting switches switching on when earthing blades are activated;
- lock preventing bus-isolating switches switching on and off when the circuit breaker is activated;
- access lock to the high-voltage equipment compartment when the line- or bus-isolating switches operating blades are activated;
- electromagnetic or mechanical lock of the disconnecting switches actuators, ensuring correct operating sequence of the switchgear.