Switchgear and control gear – SCG
Series SCG 2-12Р up to 10 kV with lower drawout element
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Description
Switchgear and control gear (SCG) of Series SCG 2-12Р 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 SCG. Their operation principle is determined by an aggregate of circuitry of the main and auxiliary 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 | 630; 1000; 1600; 2000; 2500; 3150 |
| Rated breaking current of the chamber SUM with vacuum circuit breaker, kA | 20; 31,5 |
| Peak withstand current of cells with vacuum circuit breaker, kA | 32; 51, 64 |
| Rated voltage of auxiliary circuits, V: – AC and DC protection, control and alarm circuits – voltage measuring transformers circuits – lighting | 220 100 36 |
Symbol structure
SCG is a switchgear and control gear manufactured by Chelyabinsk Electric Equipment Plant LLC
O – outdoor installation
Modification: 2-12P; HVDS; 2HVDC
Rated voltage, kV
Classification of lead-out on incoming line side:
- C – cable;
- O – overhead
Classification of lead-out on outgoing line side:
- C – cable;
- O – overhead
Rated current, A (630; 1000; 1600; 2000; 2500; 3150)
Climatic modification and placement category according to GOST15150-69
Design classification
| SUM classification attributes | Design |
|---|---|
| Insulation level according to GOST 1516.3 | Normal, level "b" |
| Insulation type | Air insulation |
| Busbar insulation | With non-insulated buses With insulated buses |
| In term of presence of draw-out elements | With draw-out elements; Without draw-out elements |
| In terms of servicing conditions | With bilateral maintenance; With unilateral maintenance |
| In terms of arrangement of draw-out element | Low; Middle |
| In terms of installation method | For indoor installation in electrical equipment rooms; For outdoor installation |
| In terms of climatic modifications and placement category | Placement category 3, climatic modification N according to GOST 15150, GOST 15543.1 |
Structural design
Main elements of SCG:
- housing;
- draw-out element;
- earthing lead;
- shutter mechanism;
- arc flash protection devices;
- circuits of relay protection and emergency control, feed-line consideration and telemechanics.
SCG housing
SCG 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.
Provisions are made in the SCG housing design for separation of compartments into collecting buses compartment, vacuum circuit breaker compartment, cable connection compartment and RPA compartment.