• IEEE C37.121 : 2012

    Superseded A superseded Standard is one, which is fully replaced by another Standard, which is a new edition of the same Standard.

    GUIDE FOR SWITCHGEAR - UNIT SUBSTATION - REQUIREMENTS

    Available format(s):  Hardcopy, PDF

    Superseded date:  26-04-2021

    Language(s):  English

    Published date:  01-01-2012

    Publisher:  Institute of Electrical & Electronics Engineers

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    Table of Contents - (Show below) - (Hide below)

    1. Overview
    2. Normative references
    3. Definitions
    4. Service conditions
    5. Transformer section
    6. Incoming section
    7. Outgoing section
    8. Ratings
    9. Construction
    10. Typical arrangements
    11. Guide for selection, application, installation and
        maintenance of unit substations
    Annex A (informative) - Bibliography

    Abstract - (Show below) - (Hide below)

    Provides three-phase unit substations for step-down operation in the range of 112.5 kVA or greater at primary voltages of 601 V through 38 kV.

    General Product Information - (Show below) - (Hide below)

    Development Note Supersedes ANSI C37.121. (02/2013)
    Document Type Standard
    Publisher Institute of Electrical & Electronics Engineers
    Status Superseded
    Superseded By
    Supersedes

    Standards Referenced By This Book - (Show below) - (Hide below)

    BS IEC/IEEE 62271-37-013:2015 HIGH-VOLTAGE SWITCHGEAR AND CONTROLGEAR - ALTERNATING-CURRENT GENERATOR CIRCUIT-BREAKERS
    14/30257408 DC : 0 BS IEC/IEEE 62271-37-013 ED 1.0 - HIGH-VOLTAGE SWITCHGEAR AND CONTROLGEAR - PART 37-013: ALTERNATING-CURRENT GENERATOR CIRCUIT-BREAKERS
    UFC 3-550-01 : CHANGE 1 UNIFIED FACILITIES CRITERIA - EXTERIOR ELECTRICAL POWER DISTRIBUTION

    Standards Referencing This Book - (Show below) - (Hide below)

    IEEE C37.91 : 2008 PROTECTING POWER TRANSFORMERS
    IEEE C37.90-2005 RELAYS AND RELAY SYSTEMS ASSOCIATED WITH ELECTRIC POWER APPARATUS
    IEEE C37.20.1:2015 METAL-ENCLOSED LOW-VOLTAGE (1000 VAC AND BELOW, 3200 VDC AND BELOW) POWER CIRCUIT BREAKER SWITCHGEAR
    IEEE C57.12.01 : 2015 GENERAL REQUIREMENTS FOR DRY-TYPE DISTRIBUTION AND POWER TRANSFORMERS
    IEEE C37.20.2 : 2015 METAL-CLAD SWITCHGEAR
    IEEE C57.12.36 : 2007 REQUIREMENTS FOR LIQUID-IMMERSED DISTRIBUTION SUBSTATION TRANSFORMERS
    NFPA 70B : 2016 RECOMMENDED PRACTICE FOR ELECTRICAL EQUIPMENT MAINTENANCE
    IEEE C57.12.24 : 2009 SUBMERSIBLE, THREE-PHASE TRANSFORMERS, 3750 KVA AND SMALLER: HIGH VOLTAGE, 34500 GRDY/19920 VOLTS AND BELOW; LOW VOLTAGE, 600 VOLTS AND BELOW
    IEEE C57.93-2007 INSTALLATION AND MAINTENANCE OF LIQUID-IMMERSED POWER TRANSFORMERS
    IEEE C57.12.00-2015 STANDARD FOR GENERAL REQUIREMENTS FOR LIQUID-IMMERSED DISTRIBUTION, POWER, AND REGULATING TRANSFORMERS
    IEEE C57.91:2011 GUIDE FOR LOADING MINERAL-OIL-IMMERSED TRANSFORMERS AND STEP-VOLTAGE REGULATORS
    IEEE C57.96 : 2013 GUIDE FOR LOADING DRY-TYPE DISTRIBUTION AND POWER TRANSFORMERS
    IEEE 4 : 2013 HIGH-VOLTAGE TESTING TECHNIQUES
    UL 1562 : 4 TRANSFORMERS, DISTRIBUTION, DRY-TYPE - OVER 600 VOLTS
    IEEE C37.20.3 : 2013 METAL-ENCLOSED INTERRUPTER SWITCHGEAR (1 KV-38 KV)
    IEEE C57.104 : 2008 INTERPRETATION OF GASES GENERATED IN OIL-IMMERSED TRANSFORMERS
    IEEE C37.010 : 1999 AC HIGH-VOLTAGE CIRCUIT BREAKERS > 1000 VAC RATED ON A SYMMETRICAL CURRENT BASIS
    ANSI C57.12.52 : 2012 Sealed Dry-Type Power Transformers, 501 kVA and Higher, Three-Phase, with High-Voltage 601 to 34500 Volts, Low-Voltage 208Y/120 to 4160 Volts—General Requirements
    IEEE C37.40 : 2003 STANDARD SERVICE CONDITIONS AND DEFINITIONS FOR HIGH-VOLTAGE FUSES, DISTRIBUTION ENCLOSED SINGLE-POLE SWITCHES, FUSE DISCONNECTING SWITCHES, AND ACCESSORIES
    IEEE C57.12.51 : 2008 VENTILATED DRY-TYPE POWER TRANSFORMERS, 501 KVA AND LARGER, THREE-PHASE, WITH HIGH-VOLTAGE 601 V TO 34 500 V; LOW-VOLTAGE 208Y/120 V TO 4160 V - GENERAL REQUIREMENTS
    NFPA 70 : 2017 NATIONAL ELECTRICAL CODE
    IEEE C37.24 : 2003 EVALUATING THE EFFECT OF SOLAR RADIATION ON OUTDOOR METAL-ENCLOSED SWITCHGEAR
    IEEE C57.12.70-2011 STANDARD TERMINAL MARKINGS AND CONNECTIONS FOR DISTRIBUTION AND POWER TRANSFORMERS
    IEEE C57.12.40 : 2011 NETWORK, THREE-PHASE TRANSFORMERS, 2500 KVA AND SMALLER; HIGH VOLTAGE, 34500 V AND BELOW; LOW VOLTAGE, 600 V AND BELOW; SUBWAY AND VAULT TYPES (LIQUID IMMERSED)
    IEEE C57.94-1982 RECOMMENDED PRACTICE FOR INSTALLATION, APPLICATION, OPERATION, AND MAINTENANCE OF DRY-TYPE DISTRIBUTION AND POWER TRANSFORMERS
    IEEE C37.23-2003 METAL-ENCLOSED BUS
    IEEE C57.12.10-2010 STANDARD REQUIREMENTS FOR LIQUID-IMMERSED POWER TRANSFORMERS
    IEEE C57.106 : 2006 ACCEPTANCE AND MAINTENANCE OF INSULATING MINERAL OIL IN ELECTRICAL EQUIPMENT
    ANSI C57.12.57 : 1987 AMERICAN NATIONAL STANDARD FOR TRANSFORMERS - VENTILATED DRY-TYPE NETWORK TRANSFORMERS 2500 KVA AND BELOW, THREE-PHASE, WITH HIGH-VOLTAGE 34500 VOLTS AND BELOW, LOW-VOLTAGE 216Y/125 AND 480Y/227 VOLTS - REQUIREMENTS
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