| PDF Pages<\/th>\n | PDF Title<\/th>\n<\/tr>\n | ||||||
|---|---|---|---|---|---|---|---|
| 1<\/td>\n | BRITISH STANDARD <\/td>\n<\/tr>\n | ||||||
| 2<\/td>\n | National foreword <\/td>\n<\/tr>\n | ||||||
| 4<\/td>\n | Foreword Foreword to amendment A11 Foreword to amendment A12 Foreword to amendment A1 <\/td>\n<\/tr>\n | ||||||
| 5<\/td>\n | Contents <\/td>\n<\/tr>\n | ||||||
| 7<\/td>\n | 1 Scope and service conditions 1.1 Scope 1.2 Service conditions <\/td>\n<\/tr>\n | ||||||
| 8<\/td>\n | 2 Normative references <\/td>\n<\/tr>\n | ||||||
| 9<\/td>\n | 3 Definitions 3.1 General 3.1.1 power transformer 3.1.2 auto-transformer 3.1.3 booster transformer 3.1.4 oil-Immersed type transformer 3.1.5 dry-type transformer 3.1.6 oil preservation system 3.2 Terminals and neutral point 3.2.1 terminal 3.2.2 line terminal <\/td>\n<\/tr>\n | ||||||
| 10<\/td>\n | 3.2.3 neutral terminal 3.2.4 neutral point 3.2.5 corresponding terminals 3.3 Windings 3.3.1 winding 3.3.2 tapped winding 3.3.3 phase winding 3.3.4 high-voltage winding 3.3.5 low-voltage winding 3.3.6 intermediate-voltage winding <\/td>\n<\/tr>\n | ||||||
| 11<\/td>\n | 3.3.7 auxiliary winding 3.3.8 stabilizing winding 3.3.9 common winding 3.3.10 series winding 3.3.11 energizing winding 3.4 Rating 3.4.1 rating 3.4.2 rated quantities 3.4.3 rated voltage of a winding 3.4.4 rated voltage ratio <\/td>\n<\/tr>\n | ||||||
| 12<\/td>\n | 3.4.5 rated frequency 3.4.6 rated power 3.4.7 rated current 3.5 Tappings 3.5.1 tapping 3.5.2 principal tapping 3.5.3 tapping factor (corresponding to a given tapping) <\/td>\n<\/tr>\n | ||||||
| 13<\/td>\n | 3.5.4 plus tapping 3.5.5 minus tapping 3.5.6 tapping step 3.5.7 tapping range 3.5.8 tapping voltage ratio (of a pair of windings) 3.5.9 tapping duty 3.5.10 tapping quantities 3.5.11 full-power tapping 3.5.12 reduced-power tapping <\/td>\n<\/tr>\n | ||||||
| 14<\/td>\n | 3.5.13 on-load tap-changer 3.6 Losses and no-load current 3.6.1 no-load loss 3.6.2 no-load current 3.6.3 load loss 3.6.4 total losses 3.6.5 total harmonic distortion factor: <\/td>\n<\/tr>\n | ||||||
| 15<\/td>\n | 3.7 Short-circuit impedance and voltage drop 3.7.1 short-circuit Impedance of a pair of windings 3.7.2 voltage drop or rise for a specified load condition 3.7.3 zero-sequence impedance (of a three-phase winding) 3.8 temperature rise <\/td>\n<\/tr>\n | ||||||
| 16<\/td>\n | 3.9 insulation 3.10 Connections 3.10.1 star connection (Y-connection) 3.10.2 delta connection (D-connection) 3.10.3 open-delta connection 3.10.4 zigzag connection (Z-connection) 3.10.5 open windings 3.10.6 phase displacement of a three-phase winding 3.10.7 connection symbol <\/td>\n<\/tr>\n | ||||||
| 17<\/td>\n | 3.11 Kinds of tests 3.11.1 routine test 3.11.2 type test 3.11.3 special test 3.12 Meteorological data with respect to cooling 3.12.1 monthly average temperature 3.12.2 yearly average temperature 4 Rating 4.1 Rated power <\/td>\n<\/tr>\n | ||||||
| 18<\/td>\n | 4.2 Loading cycle 4.3 Preferred values of rated power 4.4 Operation at higher than rated voltage and\/or at disturbed frequency 5 Requirements for transformers having a tapped winding 5.1 General \u2014 Notation of tapping range <\/td>\n<\/tr>\n | ||||||
| 19<\/td>\n | 5.2 Tapping voltage \u2014 Tapping current \u2014 Standard categories of tapping voltage variation \u2014 Maximu… 5.3 Tapping power \u2014 Full-power tappings \u2014 Reduced-power tappings <\/td>\n<\/tr>\n | ||||||
| 20<\/td>\n | Figure 1a – Constant flux voltage variation CFVV Optional maximum current tapping shown 5.4 Specification of tappings in enquiry and order <\/td>\n<\/tr>\n | ||||||
| 21<\/td>\n | Figure 1b – Variable flux voltage variation VFVV Optional maximum current tapping shown 5.5 Specification of short-circuit impedance <\/td>\n<\/tr>\n | ||||||
| 22<\/td>\n | Figure 1c – Combined voltage variation CbVV 5.6 Load loss and temperature rise <\/td>\n<\/tr>\n | ||||||
| 23<\/td>\n | 6 Connection and phase displacement symbols for three-phase transformers <\/td>\n<\/tr>\n | ||||||
| 24<\/td>\n | Figure 2 – Illustration of \u201cclock number\u201d notation \u2014 Three examples <\/td>\n<\/tr>\n | ||||||
| 25<\/td>\n | 7 Rating plates 7.1 Information to be given in all cases 7.2 Additional information to be given when applicable <\/td>\n<\/tr>\n | ||||||
| 26<\/td>\n | 8 Miscellaneous requirements 8.1 Dimensioning of neutral connection 8.2 Oil preservation system 8.3 Load rejection on generator transformers 9 Tolerances <\/td>\n<\/tr>\n | ||||||
| 27<\/td>\n | 10 Tests 10.1 General requirements for routine, type and special tests <\/td>\n<\/tr>\n | ||||||
| 28<\/td>\n | Table 1 – Tolerances <\/td>\n<\/tr>\n | ||||||
| 29<\/td>\n | 10.2 Measurement of winding resistance <\/td>\n<\/tr>\n | ||||||
| 30<\/td>\n | 10.3 Measurement of voltage ratio and check of phase displacement 10.4 Measurement of short-circuit impedance and load loss 10.5 Measurement of no-load loss and current <\/td>\n<\/tr>\n | ||||||
| 31<\/td>\n | 10.6 Measurement of the harmonics of the no-load current 10.7 Measurement of zero-sequence impedance(s) on three-phase transformers <\/td>\n<\/tr>\n | ||||||
| 32<\/td>\n | 10.8 Tests on on-load tap-changers 11 Electromagnetic compatibility (EMC) <\/td>\n<\/tr>\n | ||||||
| 33<\/td>\n | Annex A (normative) Information required with enquiry and order A.1 Rating and general data A.1.1 Normal information A.1.2 Special information <\/td>\n<\/tr>\n | ||||||
| 34<\/td>\n | A.2 Parallel operation <\/td>\n<\/tr>\n | ||||||
| 35<\/td>\n | Annex B (informative) Examples of specifications for transformers with tappings <\/td>\n<\/tr>\n | ||||||
| 36<\/td>\n | Annex C (informative) Specification of short-circuit impedance by boundaries Figure C.1 – Example of specification of short-circuit impedance by boundaries <\/td>\n<\/tr>\n | ||||||
| 37<\/td>\n | Annex D (informative) Three-phase transformer connections Figure D.1 – Common connections <\/td>\n<\/tr>\n | ||||||
| 38<\/td>\n | Figure D.2 – Additional connections <\/td>\n<\/tr>\n | ||||||
| 39<\/td>\n | Figure D.3 – Designation of connections of three-phase auto-transformers by connection symbols. Auto-transform… Figure D.4 – Example of three single-phase transformers connected to form a three-phase bank\ufffd(connection symbo… <\/td>\n<\/tr>\n | ||||||
| 40<\/td>\n | Annex E (normative) Temperature correction of load loss Annex F (informative) Bibliography <\/td>\n<\/tr>\n | ||||||
| 41<\/td>\n | Annex ZA (normative) Normative references to international publications with their corresponding European … <\/td>\n<\/tr>\n | ||||||
| 42<\/td>\n | Annex ZB (informative) Installation and safety of a liquid immersed transformer ZB.1 Manuals ZB.2 Installation ZB.2.1 General ZB.2.2 Intrinsic safety <\/td>\n<\/tr>\n | ||||||
| 43<\/td>\n | ZB.2.3 Installation precautions <\/td>\n<\/tr>\n<\/table>\n","protected":false},"excerpt":{"rendered":" Power transformers – General<\/b><\/p>\n |