NS178

NS178: Secondary System Requirements for Major Substations

This Network Standard covers the planning and design requirements for secondary systems for subtransmission feeders, subtransmission substations and zone substations.

Scope

This Network Standard:

• applies to all situations requiring planning or design of new (i.e. “greenfield”) substation secondary systems for sub-transmission feeders, sub-transmission substations and zone substations, which will become part of Ausgrid’s network.
• applies, wherever practicable, to all situations requiring planning or redesign of existing (i.e. “brownfield”) substation secondary systems for sub-transmission feeders, sub-transmission substations and zone substations, which are or will become part of Ausgrid’s network. In such “brownfield” situations where it is not practicable to strictly apply the requirements of this Standard, it shall still serve as a guide with due regard for the following factors which will always remain mandatory: safety, National Electricity Rules (NERs), reliability and good engineering practice.
• applies to all persons with responsibility for planning or designing substation secondary systems for sub-transmission feeders, sub-transmission substations and zone substations, including Ausgrid staff, contractors, alliance partners and Accredited Service Providers.
• provides details, in separate chapters, for the following types of substation secondary systems:
  • Protection systems
  • Control systems, including SCADA requirements
  • Metering systems, including indication of metered quantities
  • DC systems, including batteries and battery chargers
  • Control panels, cabling and wiring
• includes details, for each type of secondary system, of the design philosophy, including:
  • Functionality
  • Wiring standards
  • Panel layouts
  • Equipment locations
  • Communications protocols
• provides some detail of the installation or connection arrangements for the equipment described. Additional details may be provided in drawings referred to in the individual project ‘scope of works’ documentation.
• does not include details of the following substation systems, which are provided in the indicated Network Standards:
  • Building and switchyard systems, including light and power, security and fire detection/protection systems. Refer to NS185 Major Substations Building Design Standard and NS186 Major Substations Civil Design Standard.
  • Environmental monitoring systems, including temperature, wind and rain monitoring. Refer to NUS174 Environmental Procedures.
  • Communications systems for communications external to the substation. Refer to NRS 203 Planning and Design Standards for Electrical Network Communications Assets.
  • Engineering LAN requirements for local and remote interrogation and evaluation of non-operational substation status information. Refer to NS213 Network Design IEC 61850 Compliant Substation (being prepared).