Underground Mini Subs

SUPPLY OF UNDERGROUND MINI SUBSTATION

1. GENERAL:

  • Mini-sub will consist of a 3-compartment lockable structure manufactured from 5mm folded sheet metal (Type B)
  • All doors will be tamper proof and pad-lockable (Barker & Nelson)
  • Colour to your specification. (Powder coat).
  • Cubicles will be mounted on a industrial channel iron chassis
  • Mini-sub according to SABS specifications
  • Doors – Painted Chevron
  • Danger labels place on doors

 

2. HT CUBICLE: (Medium voltage)

  • 1 x Schneider RM6 (11 KV) ring main unit complete with VIP 35 relay and shunt trip.

NOTE: This unit will be New.

 

3. TRANSFORMER:

 

RATING: 630KVA
PRIMARY VOLTAGE: 6600 Volt
SECONDARY VOLTAGE: 550 Volt
RATED FREQUENCY: 50Hz
PHASES: 3
TAP CHANGER:

Off-load tap changer (± 2.5 and ± 5 % of normal voltage)

COOLING: ONAN
VECTOR GROUP: Dyn 11
SPECIFICATIONS: SANS 780
COLOUR: ORANGE

 

4. FITTED WITH:

Oil Level indicator: Yes
Aluminium rating plate: Yes
Bolted Top cover: Yes
Drain valve & Filler cap: Yes
Copper / Copper windings: Yes

 

5. LV COMPARTMENT:

Busbar rating: 800 Amps
3 x Ammeters (Maximum demand): Yes
3xCT’s: Yes – 800/5, Class1
1 x Voltmeter: Yes
1 x Selector switch: Yes
Circuit breaker mounting plate: Yes
Main circuit breaker: 800 Amp – Adjustable (Schneider)
Feeder circuit breakers:

Yes - 3 x 300 Amp – AdjUstable (Schneider)

Gland Plate: Yes
EPC Adit relay: Yes - 5 Amp, 2/2 Class x CT
NER: Yes - 63.5Ohm, 5 Amp, 1600W
CT’s: Yes - 66 KV, 8015, 1 OVA, Class 1
1 x Amp meter: Yes - 80/5
1 x Lighting Transformer: Yes - 1 KVA, 550 1110 Volt