AS 2374.5-1982

1 - AS 2374, Part 5-1982 POWER TRANSFORMERS - ABILITY TO WITHSTAND SHORT-CIRCUIT
4 - PREFACE
4 - CONTENTS
5 - SECTION 1. SCOPE AND DEFINITIONS
5 - 1.1 SCOPE.
5 - 1.2 DEFINITIONS.
6 - SECTION 2. REQUIREMENTS WITH REGARD TO ABILITY TO WITHSTAND SHORT-CIRCUIT
6 - 2.1 GENERAL.
6 - 2.2 OVERCURRENT CONDITIONS.
6 - 2.2.1 Transformers with Two Separate Windings.
6 - 2.2.2 Transformers with more than Two Windings and Autotransformers
7 - 2.2.3 Booster Transformers.
7 - 2.2.4 Transformers Directly Associated with Other Apparatus
7 - 2.2.5 Special Transformers.
7 - 2.2.6 Tap-changing Equipment.
7 - 2.2.7 Neutral Terminals.
8 - SECTION 3. DEMONSTRATION OF ABILITY TO WITHSTAND SHORT-CIRCUIT
8 - 3.1 THERMAL ABILITY TO WITHSTAND SHORT-CIRCUIT.
8 - 3.1.1 General.
8 - 3.1.2 Value of the Symmetrical Short-circuit Current I for Transformers with Two Windings
8 - 3.1.3 Duration of the Symmetrical Short-circuit Current I
8 - 3.1.4 Maximum Permissible Value of the Highest Average Temperature
8 - 3.1.5 Calculation of the Temperature
8 - 3.1.6 Value of the Symmetrical Short-circuit Current I for Transformers with more than Two Windings and Autotransformers
9 - 3.2 DYNAMIC ABILITY TO WITHSTAND SHORT-CIRCUIT.
9 - 3.2.1 General.
9 - 3.2.2 Condition of the Transformer before the Short-circuit Tests.
9 - 3.2.3 Peak Value l^ for Two-winding Transformers.
9 - 3.2.4 Value and Duration of the Short-circuit Test Current for Two-windings Transformers
10 - 3.2.5 Short-circuit Testing Procedure for Transformers with Two Windings.
10 - 3.2.6 Detection of Faults.
12 - APPENDIX A - MODIFIED SHORT-CIRCUIT TEST PROCEDURES FOR CATEGORY I TRANSFORMERS

Specifies the design of power transformers as defined in AS 2374.1, and the requirements necessary both in regard to their ability to withstand short-circuit and the means of demonstrating that ability. Based on IEC 76-5.

This standard specifies the design of power transformers as defined in AS 2374, Part 1, and the requirements necessary both in regard to their ability to withstand short-circuit and the means of demonstrating that ability.NOTES:1. Pending the publication of a standard that applies to dry-type transformers*, the requirements of this standard may be applied to dry-type transformers subject to agreement between the purchaser and the manufacturer and taking into account the principles established in Sections 2 and 3.2. A reduced schedule of short-circuit tests may be applied to Category I transformers by agreement between purchaser, manufacturer and testing authority. Guidance on the reduced schedule is given in Appendix A.

Reconfirmed 1987