IEEE C57.12.01 1979

$23.29

Dry-Type Transformers Incorporating Solid Cast and/or Resin-Encapsulated Windings

Published By	Publication Date	Number of Pages
IEEE	1979	32

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Description

New IEEE Standard – Inactive – Superseded. Superseded. Electrical, mechanical, and safety requirements of ventilated, nonventilated, and sealed dry-type distribution and power transformers or autotransformers, single and polyphase, with a voltage of 601 V or higher in the highest voltage winding, are described. Information that can be used as a basis for the establishment of performance, interchangeability, and safety requirements of equipment described, and for assistance in the proper selection of such equipment, is given.

PDF Catalog

PDF Pages	PDF Title
9	1 Scope 2 Terminology 3 References 3.1 Standards References
10	3.2 Applicable Documents in Preparation 4 Serviceconditions 4.1 Usual Service Conditions 4.2 Unusual Service Conditions
11	Table 1 Dielectric-Strength Correction Factors for Altitudes Greater than 3300 ft (1000 m)
12	5 RatingData Cooling Classes of Transformers 5.2 Frequency 5.3 Phases 5.4 RatedkVA Table 2 Preferred Continuous kVA Ratings
13	5.6 Connections Polarity Angular Displacement and Terminal Markings 5.8 Impedance 5.9 Losses Fig 1 Phase Relation of Terminal Designations for Three-phase Transformers
14	5.10 Insulation Levels Table 3 Insulation Levels for Dry-Type Transformers
15	Temperature Rise and Insulation-System Capability
16	Table 4 Limits of Temperature Rise for Continuously Rated Transformers
17	5.12 Nameplates
18	Table 5 Nameplate Information
19	Fig 2 Designation of Voltage Ratings of Single- and Three-phase Windings
21	6 Construction 6.1 Tank-Pressure Requirements 6.2 Finish 6.3 Transformer Accessories 6.4 Terminals 6.5 Grounding Sh ort-Circuit Characteris tics 7.1 Short-circuit Requirements 7.2 Transformer Categories
22	Short-Circuit-Current Duration and Magnitude
23	System Zero-Sequence Data Application Conditions Requiring Special Consideration 7.6 Components Table6 ValuesofK
24	Base BVA and Base Currents Effects of Temperature on Transformer Windings During Short-circuit Conditions Calculation of Winding Temperature During a Short Circuit
25	Testing and Calculations 8.1 General 8.2 Test Classifications Routine Design and Other Tests 8.4 Calculations 9 Tolerances 9.1 Ratio 9.2 Impedance
26	9.3 Losses Table 7 Dry-Type Transformer Tests Table 8 Tolerances for Single-phase and Three-phase Transformer Losses
27	Connection of Transformers for Shipment
29	Unusual Temperature and Altitude Conditions A1 Unusual Temperature and Altitude Service Conditions A2 Effect of Altitude on Temperature Rise A3 Operation at Rated kVA A4 Operation at Less than Rated kVA Table A1 Maximum 24H Average Temperature of Cooling Air Table A2 Rated kVA Derating Factors for Altitudes Greater than 3300 ft (1000 m)