Table of Contents

1 Scope
2 Normative references
3 Definitions
4 Normal service conditions
5 Unusual service conditions
6 Classification by anti-pollution characteristic
7 Ratings
7.1 Classification by rated power
7.2 Rated voltages
7.3 Tapping voltages
7.4 Rated power factor
8 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 Tolerance
9 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 Accessories
10 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 product
11 Designation of product
12 Marking

Abstract

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.

General Product Information

Published
Document Type	Standard
Status	Current
Publisher	Japanese Standards Association
Pages
ISBN
Supersedes	JIS C 4304:2005