scope:

This specification covers the electrical supply and pilot cables to the isolating transformers, from outdoor ancillary cubicles, installation and commissioning of Outdoor Ancillary Cubicles and the electrical equipment housed within the cubicle. Electrical equipment shall include a 240V a.c. isolator, distribution board, intertripping relay, battery charger, plant marshalling box and supervisory equipment, (the supervisory equipment will be supplied under another contract). This specification also includes the design, manufacture, erection, factory & site testing/commissioning and for the supply and installation testing/commissioning of the cubicle and electrical installation.

Purpose

A total of four outdoor ancillary cubicles are required to interface between five 25kV isolating transformers. Three cubicles at Dollands Moor interfacing with one isolating transformer per cubicle and one cubicle at Mitre Bridge interfacing with two isolation transformers. The cubicles shall be provided with 240 a.c. electrical supply and 50 d.c. to the supervisory and protection equipment housed within the cubicle.