Search scope:
Shopping cart (0)
Standard

IEEE C37.121-1989

Revised

Note: Latest version: IEEE C37.121-2020

Preview

Existing or new amendments and versions must be purchased separately.

Language
Services

Abstract

New IEEE Standard - Superseded. This standard covers the requirements for three-phase unit substations for step-down operation in the range of 112.5 kVA through 10 000 kVA at primary voltages of 601 volts through 38 kilovolts. The standard is intended for use as the basis for the coordination of equipment by assisting in the selection of components. A variety of designs for unit substations are possible using various combinations of incoming sections, transformer sections, outgoing sections, and transition (throat) sections. Since the transformer section determines the kVA and voltage capabilities of a unit substation, the ratings of the various types of unit substations are described in terms of transformer capability.

Products specifications

  • Standard from IEEE
  • Published:
  • Document type: IS
  • Pages
  • Publisher: IEEE
  • Distributor: IEEE
  • ICS: 29.130.10
  • National Committee: IEEE Power and Energy Society / Switchgear

Product Relations

  • Revised by: IEEE C37.121-2012
  • Refers: IEEE 4-1978
  • Refers: ANSI C57.12.10-1988, Transformers — 230 kVA and below 833/958 through 8333/10,417 kVA, Single-Phase, and 750/862 through 60 000/80 000/100 000 kVA, Three-Phase, without Load-Tap Changing; and 3750/4687 through
  • Refers: Pad-Mounted Compartmental-Type Transformers
  • Refers: 60 000/80 000/100 000 kVA with Load-Tap Changing — Safety Requirements
  • Refers: ANSI C57.12.51-1981 (R1989), Ventilated Dry-Type Power Transformers, Three-Phase, 750—5000 kVA
  • Refers: ANSI C57.12.52-1981 (R1989), Sealed Dry-Type Power Transformers, Three-Phase, 750—5000 kVA
  • Refers: ANSI C57.12.13-1982, Conformance Standard for Liquid-Filled Transformers Used in Unit Substations, Excluding
  • Refers: ANSI C37.55-1989, Switchgear — Metal-Clad Switchgear Assemblies — Conformance Test Procedures
  • Refers: ANSI C57.12.50-1981 (R1989), Ventilated Dry-Type Distribution Transformers, Three-Phase 5—500 kVA