JIS C 4304:2013

1 Scope2 Normative references3 Definitions4 Normal service conditions5 Unusual service conditions6 Classification by anti-pollution characteristic7 Ratings 7.1 Classification by rated power 7.2 Rated voltages 7.3 Tapping voltages 7.4 Rated power factor8 Performances 8.1 No-load current 8.2 No-load loss 8.3 Transformation ratio 8.4 Short-circuit impedance 8.5 Balance of single-phase 3-wire system 8.6 Voltage regulation 8.7 Efficiency 8.8 Limit of temperature rise 8.9 Dielectric strength 8.10 Noise 8.11 Ability to withstand short circuit 8.12 Pollution performance of bushing 8.13 Variation in voltage and frequency 8.14 Tolerance9 Construction 9.1 Construction in general 9.2 Bushing 9.3 Lead wire 9.4 Tap change-over terminals 9.5 Earth terminal 9.6 Connection of transformer 9.7 Terminal mark, polarity and phase displacement 9.8 Accessories10 Tests 10.1 General matters relating to routine tests, type tests and special tests 10.2 Measurement of winding resistance 10.3 No-load current and no-load loss tests 10.4 Transformation ratio test, polarity test and phase displacement test 10.5 Load loss and short circuit impedance tests 10.6 Test for balance of single-phase 3-wire system 10.7 Voltage regulation 10.8 Efficiency 10.9 Temperature rise test 10.10 Dielectric withstand voltage tests 10.11 Noise test 10.12 Test for ability to withstand short circuit 10.13 Test for pollution performance of bushing 10.14 Construction of product11 Designation of product12 Marking

Defines 6 kV single phase or three-phase outdoor self-cooled oil-immersed transformers with a rated capacity not exceeding 500 kVA and a rated frequency of 50 Hz or 60 Hz used for the purpose of general power distribution.

2013 [20/05/2013]2005(R2010) [01/10/2010]2005 [20/04/2005]99 [20/11/1999]77