BIS IS 1180-1 : 2014 AMD 2 2017

FOREWORD
1 SCOPE
2 REFERENCES
3 TERMINOLOGY
4 SERVICE CONDITIONS
5 GENERAL
6 TECHNICAL PARAMETERS OF THREE PHASE DISTRIBUTION
   TRANSFORMERS UP TO AND INCLUDING 200 KVA
   (NON-SEALED AND SEALED TYPE)
7 TECHNICAL PARAMETERS OF THREE PHASE DISTRIBUTION
   TRANSFORMERS HIGHER THAN 200 KVA UP TO AND
   INCLUDING 2500 KVA (NON-SEALED AND SEALED TYPE)
8 TECHNICAL PARAMETERS OF SINGLE PHASE DISTRIBUTION
   TRANSFORMERS UP TO AND INCLUDING 25 KVA (SEALED TYPE)
9 STANDARD MATERIALS
10 TERMINAL ARRANGEMENT
11 MINIMUM CLEARANCES IN AIR
12 CONNECTORS (APPLICABLE FOR BARE BUSHING
   TRANSMISSIONS ONLY)
13 MARKING
14 MOUNTING ARRANGEMENT
15 TRANSFORMER TANK
16 CONSERVATOR FOR NON-SEALED TYPE TRANSFORMERS
17 ABILITY OF TRANSFORMERS TO WITHSTAND EXTERNAL
   SHORT CIRCUIT
18 EFFICIENCY AND REGULATION
19 TOLERANCES
20 FITTING
21 TESTS
22 INFORMATION REQUIRED WITH ENQUIRY AND ORDER
ANNEX A - LIST OF REFERRED INDIAN STANDARDS
ANNEX B - METHOD OF DECLARING EFFICIENCY
ANNEX C - CALCULATION OF INHERENT VOLTAGE REGULATION
ANNEX D - INFORMATION REQUIRED WITH ENQUIRY AND ORDER

Defines the requirements and tests including standard loss levels of mineral oilimmersed, natural air-cooled, outdoor type, doublewound distribution transformers for use in power distribution systems with nominal system voltages up to and including 33 kV and of following types and ratings: a) Three phase ratings up to and including 200 kVA both non-sealed type and sealed type; b) Three phase ratings higher than 200 kVA, up to and including 2500 kVA both non-sealed type and sealed type; and c) Single phase ratings up to and including 25 kVA sealed type.