BS EN 60076-3:2013+A1:2018
$198.66
Power transformers – Insulation levels, dielectric tests and external clearances in air
| Published By | Publication Date | Number of Pages |
| BSI | 2018 | 64 |
This International Standard applies to power transformers as defined by and in the scope of IEC 60076‑1 . It gives details of the applicable dielectric tests and minimum dielectric test levels. Recommended minimum external clearances in air between live parts and between live parts and earth are given for use when these clearances are not specified by the purchaser.
For categories of power transformers and reactors which have their own IEC standards, this standard is applicable only to the extent in which it is specifically called up by cross reference in the other standards.
PDF Catalog
| PDF Pages | PDF Title |
|---|---|
| 2 | undefined |
| 7 | CONTENTS |
| 9 | FOREWORD |
| 11 | INTRODUCTION |
| 12 | 1 Scope 2 Normative references 3 Terms and definitions |
| 13 | 4 General |
| 15 | 5 Highest voltage for equipment and rated insulation level |
| 16 | 6 Transformers with re-connectable windings |
| 17 | 7 Dielectric tests 7.1 Overview |
| 18 | 7.2 Test requirements 7.2.1 General |
| 19 | 7.2.2 Test voltage levels Tables Table 1 – Requirements and tests for different categories of transformers based on the Um of the highest voltage windings |
| 20 | Table 2 – Test voltage levels (1 of 2) |
| 21 | Table 3 – Test voltage levels used in special cases |
| 22 | 7.2.3 Test sequence 7.3 Test requirements for specific transformers 7.3.1 Tests for transformers with Um ≤ 72,5 kV |
| 23 | 7.3.2 Tests on transformers with 72,5 kV < Um ≤ 170 kV |
| 24 | 7.3.3 Tests on Transformers with Um > 170 kV |
| 25 | 7.4 Assigning Um and test voltages to the neutral terminal of a winding 7.4.1 Transformers with Um ≤ 72,5 kV 7.4.2 Transformers with Um > 72,5 kV 8 Dielectric tests on transformers that have been in service |
| 26 | 9 Insulation of auxiliary wiring (AuxW) 10 Applied voltage test (AV) |
| 27 | 11 Induced voltage tests (IVW and IVPD) 11.1 General 11.2 Induced voltage withstand test (IVW) |
| 28 | 11.3 Induced voltage test with partial discharge measurement (IVPD) 11.3.1 General 11.3.2 Test duration and frequency 11.3.3 Test sequence |
| 29 | 11.3.4 Partial discharge (PD) measurement Figures Figure 1 – Time sequence for the application of test voltage for induced voltage test with partial discharge measurement (IVPD) |
| 30 | 11.3.5 Test acceptance criteria 12 Line terminal AC withstand test (LTAC) |
| 31 | 13 Lightning impulse tests (LI, LIC, LIN, LIMT) 13.1 Requirements for all lightning impulse tests 13.1.1 General 13.1.2 Tap positions 13.1.3 Records of tests |
| 32 | 13.1.4 Test connections |
| 33 | 13.2 Full wave lightning impulse test (LI) 13.2.1 Wave shape, determination of test voltage value and tolerances |
| 34 | 13.2.2 Tests on transformers without non-linear elements |
| 35 | 13.2.3 Tests on transformers with non-linear elements |
| 36 | 13.3 Chopped wave lightning impulse test (LIC) 13.3.1 Wave shape 13.3.2 Tests on transformers without non-linear elements |
| 37 | 13.3.3 Tests on transformers with non-linear elements |
| 38 | 13.4 Lightning impulse test on a neutral terminal (LIN) 13.4.1 General 13.4.2 Waveshape |
| 39 | 13.4.3 Test sequence 13.4.4 Test criteria 14 Switching impulse test (SI) 14.1 General 14.2 Test connections |
| 40 | 14.3 Waveshape 14.4 Test sequence 14.5 Test criteria |
| 41 | 15 Action following test failure 16 External clearances in air 16.1 General |
| 42 | 16.2 Clearance requirements |
| 43 | Table 4 – Minimum clearances in air (1 of 2) |
| 45 | Annexes Annex A (informative) Application guide for partial discharge measurements on transformers |
| 46 | Figure A.1 – Calibration circuit for partial discharge measurement using the test tap of condenser type bushing |
| 47 | Figure A.2 – Circuit for partial discharge measurement using a high-voltage coupling capacitor |
| 50 | Annex B (informative) Overvoltage transferred from the high-voltage winding to a low-voltage winding |
| 51 | Figure B.1 – Equivalent circuit for capacitive transfer of overvoltage |
| 52 | Annex C (informative) Information on transformer insulation and dielectric tests to be supplied with an enquiry and with an order |
| 55 | Annex D (informative) Neutral insulation voltage level calculation |
| 58 | Annex E (informative) Basis for dielectric tests, insulation levels and clearances |
| 61 | Bibliography |
