NR NR/PS/ELP/27196 ISSUE 2 PDF

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 230 V 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 includes the design, manufacture, erection, factory & site testing/commissioning and for the supply and installation testing/commissioning of the cubicle and electrical installation.

Purpose

Outdoor ancillary cubicles are required to interface between five 25 kV isolating transformers. The cubicles shall be provided with 230 V a.c. electrical supply and 48 V d.c. to the supervisory and protection equipment housed within the cubicle.