Compact Substation

A Compact Substation (CSS) is utilized for energy transformation in the secondary distribution network, converting from Medium Voltage (MV) to Low Voltage (LV). These substations are typically installed in locations accessible to the public and ensure protection for all, in accordance with specified service conditions. The substation is compact in size, suitable for frequent relocation, and designed for use in outdoor environments.

The substation is installed and mounted on a skid frame or wheels (Mobile) or channels (Stationary) and is equipped with lifting hooks. It is a compact enclosure consisting of MV Switchgear, Transformer, and LV Switchgear, located in segregated compartments from each other by partitions to ensure personnel safety.

Modular Compact Substations may be Mobile or Stationary. CSS offers several advantages over conventional substations, including space savings, easy installation, maintenance-free operation, easy accessibility, and ensuring safety and aesthetics.

Technical Specification:

• Standard applicable : IEC / 62271-202
• Transformer rating upto : KVA / 2500
• Maximum HT Voltage : KV / 33
• LT Voltage : V / 415
• Short Circuit breaking capacity of HT Switchgear: KA/Upto 25
• Frequency :HZ : 50/60
• Ingress protection of HT & LT : IP / 55
• Ingress protection of Transformer : IP / 23
• Attitude above sea level : m / 2000

Advantages:

• Long Life Span
• Robust Construction
• Easy to operate and Maintenance Free MV RMU
• Compact size in a minimum area of 6sq.m
• All live parts protected by interlocked covers/doors
• Al equipment are metallicallyearthed /external grid earth on either side.
• The space occupied is 25% of space required for open installation.
• Reliable in operation and can be mobilized in one unit.
• Sufficient cooling of the intergraded system is achieved bymeansof ventilation (Louvres).
• Cable connection from front.
• All equipment are factory assembled &tested.

Salient Features:

• Highly designed solution to meet customer requirements
• Powder coated /corrosion and weatherproof enclosure.
• Compact in construction, occupies less space and does not affect the elevation of industrial/ commercial needs
• Fully compartmentalized design
• Wide choice of components and ratings to meet exact application requirement allows for extreme flexibility.

Typical Overall Dimension:

S.NO	CAPACITY IN KVA	LENGTH	WIDTH	HEIGHT
1	315	3800	1200	2000
2	500	3800	1200	2000
3	800	3800	1200	2000
4	1250	4800	1400	2300
5	1500	4800	1400	2300
6	2500	4800	2400	2600

Tranformer:

• Wide range of transformer up to 3000kVA
• Transformer oil cooled or dry type (Cast Resin)
• High energy efficient minimizing losses.
• Plug-in bushings.
• Tap changer.
• Winding temperature and oil monitoring relay.

MV Switchgear:

• Free Standing SF6 RMU or Vaccum Contactors
• Upto 12kV/630A/Switches,250 Circuit Breaker
• SF6 insulated switch with Vaccum Circuit Breaker.
• Protection with Fuse or self/auxiliary powered relay.
• Fully interlocked protection with pad locking facilities.
• Single line diagram for simple and safe operation .
• Voltage presence & earth fault indicators.
• Designed accordance with IEC 62271-100/IEC 60694.

System Voltage (KV)	12	17.5	24	33
Power Frequency(KV)	28	38	50	75
BIL (KV)	75	95	125	175
Rated Current(A)	1250	1250	1250	1250
Short time current (KA)	25	25	25	220

LV Switchgear:

• Feed using solid Copper/Aluminum bus bars direct from transformer.
• Circuit Switching using Moulded case Circuit Breaker protection(MCCB)
• MCCB type incomer upto 1600A
• MCCB type outgoing feeder up to 400A
• Feeder terminals suitable for both Cu/AI.
• Current Transformer for Power meeting

System Voltage (V)	380/400
Rated Current (A)	2500
Rated Short Circuit Current (KA)	40
Rated Freauency (Hz)	50/60
Rated Impulse Withstand voltage (KV)	6
No.of Phases	3

• Manufactured from 1.5 /3mm Sheet Steel .
• Finish-Epoxy Powder Paint-Outdoor-RAL 7035/Indoor RAL 7032
• Compartment doors with natural ventilation(Louvred with fne wire Mesh)
• Separate canopy to minimize heating by radiation / rain protection
• Lockable compartment doors/ panel earthed
• Lifting by forklift or crane possible
• Suitable for outdoor installation

The enclosure is typically divided into three compartments for the medium-voltage switchgear, low voltage switchboard, and transformer. All standard modules of compartments, doors, and ceilings are produced using roller-formed sections.

The detachable roof with ventilation openings is supported by a beam and secured to the corner sections with bolts. Standard doors are fitted with handles and bolts for padlocks. The doors are closed by means of a two-point device, which secures the door to the top frame and the base frame. The doors are fitted with stainless steel hinges and door stoppers.

The wall and roof modules are assembled by means of a self-locking mechanism.