IEEE C57.12.70:2020 pdf download.IEEE Standard for Standard Terminal Markings and Connections for Distribution and Power Transformers.
IEEE C57.12.70 defines the terminal markings and connections for distribution, power, and regulating transformers covered in the IEEE C57Th1 series of standards, guides, and recommended practices.
1.2 Purpose
The standard provides a consistent method for terminal markings and connections for single-phase and three-phase distribution, power, and regulating transformers. It designates terminal markings for interchangeability showing the sequence, external terminations, neutral terminations, grounded terminations, and marking of full and tap winding terminations. It also puts forth the connections of single- phase transformers in various configurations and describes the angular displacement of three-phase transformers when connected to various system phase displacements.
1.3 Word usage
The word shall indicates mandatory requirements strictly to be followed in order to conform to the standard and from which no deviation is permitted (shall equals is required to). 1.2
The word should indicates that among several possibilities one is recommended as particularly suitable, without mentioning or excluding others: or that a certain course of action is preferred but not necessarily required (should equals is recommended that).
The word can is used for statements of possibility and capability, whether material, physical, or causal (can equals is able to).
2. Normative references
The following referenced documents are indispensable for the application of this document (i.e., they must be understood and used, so each referenced document is cited in text and its relationship to this document is explained). For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments or corrigenda) applies.
ANSI C57.12.5OTM, American National Standard Requirements for Ventilated Dry-Type Distribution Transformers, 1 to 500 kVA, Single-Phase; and 15 to 500 kVA, Three-Phase; with High Voltage 601 to 34 500 Volts, Low-Voltage 120 to 600 Volts.
IEC 60076-1, Power transformers—Part I: General.
IEEE Std C57. I 2.00Th1, IEEE Standard for General Requirements for Liquid-Immersed Distribution, Power, and Regulating Transformers.
IEEE Std C57.12.OITM, IEEE Standard for General Requirements for Dry-Type Distribution and Power Transformers.
IEEE Std C57. 12.1 OTM, IEEE Standard Requirements for Liquid-Immersed Power Transformers.
IEEE Std C57.12.2OTNi, IEEE Standard fbr Overhead-Type Distribution Transformers, 500 kVA and Smaller: High Voltage, 34 500 V and Below; Low Voltage. 7970/13 800Y V and Below.
IEEE Std C57.12.23TM, IEEE Standard for Submersible Single-Phase Transformers: 250 kVA and Smaller; High Voltage 34 000 GrdY/19 920 V and Below; Low Voltage 600 V and Below.
IEEE Std C57.12.24TM, IEEE Standard for Submersible. Three-Phase Transformers, 3750 kVA and Smaller: High Voltage. 34 500 GrdYf 19 920 Volts and Below; Low Voltage, 600 Volts and Below.
IEEE Sid C57.12.34T1, IEEE Standard Requirements for Pad-Mounted, Compartmental-Type, SelfCooled. Three-Phase Distribution Transf’ormers, 10 MVA and Smaller; High Voltage, 34.5 kV Nominal System Voltage and Below; Low Voltage, 15 kV Nominal System Voltage & Below.
IEEE Std C57.12.36Th1, IEEE Standard Requirements for Liquid-Immersed Distribution Substation Transformers.
IEEE Std C57.12.38T%1, IEEE Standard for Pad-Mounted-Type, Self-Cooled. Single-Phase Distribution Transformers; High Voltage, 34 500 GrdY/19 920 V and Below, Low Voltage, 240/120 V; 167 kVA and Smaller.IEEE C57.12.70 pdf download.