instruction manual - BHEL Bhopal

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PREFACE BHEL Transformers and Reactors are designed, manufactured and tested with care. With proper attention during installation and use, the user should receive from it the maximum expected service. Before installing the transformers/ reactor read these instructions carefully. These instructions have been prepared to provide information on assembly, installation, commissioning and regular maintenance of the transformers/reactors and shall form part of Instruction Manual. These instructions do not intend to cover operation and maintenance of the transformer under abnormal conditions. Should further information be needed or any problem arises which is not covered by these instructions, please ask BHEL for further information. In operating the Transformer/Reactor, Care should be taken that loading limits as specified are strictly followed. For instructions regarding, general information on accessories such as OLTC, WTI, OTI, Buchholz relay, fan, pump, etc. Vol. I may please be referred. Prepared By Samvet Lahari, Bhopal. Phone- 5277412
CONTENTS Page No. SECTION 1 GENERAL INFORMATION 1.1 INTRODUCTION 11 1.2 TRANSPORT OF TRANSFORMER / REACTOR 13 SECTION 2 INSTALLATION 2.1 RECEPTION AND ASSEMBLING OF TRANSFORMERS / REACTORS DESPATCHED PARTLY DISMANTLED AND FILLED WITH NITROGEN 21 2.2 STORING OF TRANSFORMER / REACTOR DESPATCHED FILLED WITH NITROGEN 33 2.3 ASSEMBLING OF EXTERNAL PIPES 35 2.4 INSULATING OIL, QUALITY AND TREATMENT 37 2.5 OIL FILLING UNDER VACUUM 41 2.6 OIL FILLING INSTRUCTIONS FOR CONSERVATORS WITH AIR CELL 47 2.7 UNTANKING OF ACTIVE PART 53 2.8 MOUNTING OF GASKETS 55 2.9 WELDED COVER (IF APPLICABLE) 57 2.10 EARTHING OF ACTIVE PART AND CORE INSULATION TEST 59 2.11 TOUCH-UP PAINTING 69 SECTION 3 COMMISSIONING 3.1 TESTING AFTER ASSEMBLY OF THE TRANSFORMER / REACTOR AT SITE 77 3.2 COMMISSIONING CHECKS - TRANSFORMER 79 3.3 COMMISSIONING CHECKS - REACTOR 93 SECTION 4 MAINTENANCE AND OPERATION 4.1 SUPERVISION OF TRANSFORMER / REACTOR 101 4.2 SUPERVISION AND CONTROL OF OIL 109 4.3 TROUBLE SHOUTING 109 4.4 PARALLEL OPERATION 119 4.5 DO'S AND DON'TS 137 4.6 DISPOSAL 145 Prepared By Samvet Lahari, Bhopal. Phone- 5277412
Page 1 and 2: {ÉÉ´É®ú ]ÅõÉÆºÉ¡òÉÇ
Page 3: ºlÉÉ{ÉxÉ, Eò¨ÉÒÉËxÉMÉ,
Page 7 and 8: 1.1 INTRODUCTION SECTION 1 GENERAL
Page 9 and 10: 1.2.1 WITH OIL The Transformer is f
Page 11 and 12: ¦ÉÉMÉ-2 ºlÉÉ{ÉxÉ SECTION-2
Page 13 and 14: Alternatively for movement of trans
Page 15 and 16: (v) Check that there is no overpres
Page 17 and 18: 2.1.14 ACCESSORIES Accessories like
Page 19 and 20: (vii) MBox, OLTC motor drive, Fans,
Page 21 and 22: CHARACTERISTICS AND PARAMETERS OF N
Page 23 and 24: 2.5.3 FLOW CHART FOR HANDLING In An
Page 25 and 26: 2.5.7.1 SAMPLING Oil sampling at va
Page 27 and 28: (iv) Remove air release plugs (5) (
Page 29 and 30: 2.7.4.1 COVER When lifting the cove
Page 31 and 32: (v) For making leak proof and good
Page 33 and 34: 2.11.5 FINISHING PAINT Two coats of
Page 35 and 36: ANNEXURE 2.2 EQUIPMENT FOR OIL-FILL
Page 37 and 38: Prepared By Samvet Lahari, Bhopal.
Page 39 and 40: TRANSFORMER REACTOR ]ÅõÉÆºÉ¡
Page 41 and 42: Fig. 2.6 ÊSÉjÉ 2.6 Fig. 2.7 ÊS
Page 43 and 44: NOTE: Fig. 2.9 ÊSÉjÉ 2.9 1. WHIL
Page 45 and 46: ¦ÉÉMÉ-3 Eò¨ÉÒÉËxÉMÉ SEC
Page 47 and 48: Colour Identification White Gas of
Page 49 and 50: 3.2.3 OIL CHARACTERISTICS Take nece
Page 51 and 52: 3.2.9 VOLTAGE RATIO TEST Ratio on a
Page 53 and 54: 3.2.14 PROTECTION AND ALARMS Prove
Page 55 and 56:
Note: (i) While checking these valu
Page 57 and 58:
Prepared By Samvet Lahari, Bhopal.
Page 59 and 60:
SECTION 4 4. MAINTENANCE AND OPERAT
Page 61 and 62:
4.1.4.1 OVERLOAD A Transformer can
Page 63 and 64:
Difference in temp. 10 o C 20 o C 3
Page 65 and 66:
Page 67 and 68:
1. Measurement of insulation resist
Page 69 and 70:
Table 4.6 Gases to be analysed and
Page 71 and 72:
SI Items to be inspected 1. Ambient
Page 73 and 74:
12. Diverter switch oil 13. Tank co
Page 75 and 76:
Note 1 The voltages indicated in co
Page 77 and 78:
Page 79 and 80:
4.5 DO’S AND DON’TS 4.5.1 DON
Page 81:
4.6 DISPOSAL The items to be dispos
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instruction manual - BHEL Bhopal

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