instruction manual - BHEL Bhopal

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It is very important that the pipe is tight. Possible leakage will cause moisture on the transformer with the service disturbances. Mounting of the breather pipe shall be as per OGA drawing. 2.3.3. OIL CONSERVATOR For position of conservator along with necessary supports, refer OGA drawing. 2.3.4 OIL CONSERVATOR PIPE The pipe has dimension 80 mm usually and has welded flanges. The pipe shall be painted internally with a yellow, oil-resistant paint, and externally with a paint specified on the drawing. The pipes shall always incline upwards minimum 2/3 degrees from the transformer. 2.3.5 EQUALISING PIPES The pipe system in connection with the transformer cover is as a rule manufactured in workshop. The pipe between transformer and conservator may be pre-assembled. The pipe is provided with weld-flanges. No pipe part is allowed to be so long that internal inspection and cleaning is difficult to carry out. Besides straight extensions, each pipe part may contain one bend. The pipes shall always be placed with minimum 2/3 degrees inclining upwards from the transformer. Internal surface treatment is with yellow oil resistant paint. External surface treatment is made as specified on the drawing as per specification. Cleanliness is extremely important. 2.3.6 COOLERS The positioning of the radiators/coolers is indicated on OGA drawing. These are positioned so that the highest point of the oil-pipe system is always positioned below the bottom level of the conservator. The pipe system is provided with filter valves at the start and finish to enable pumping the oil through the system. All places where air may be collected are provided with air release plugs/ valves. 2.3.7 COOLER PIPES The pipe having dimensions as per OGA drawing and may be provided with weld- flanges, expansion joints. No pipe part is allowed to be so long that internal inspection and cleaning will be difficult. The pipes shall be placed so that air release plugs will be positioned at the highest point of the pipe part. The pipes shall be painted internally with a yellow, oil-resistant paint and externally according to the paint as per specification. 2.4 INSULATING OIL, QUALITY AND TREATMENT 2.4.1 QUALITY The oil to be filled in transformer generally complies with the requirements of the customer's specification. The characteristics of fresh oil as per IS: 335 "Specification for New Insulating Oil" are given below: Prepared By Samvet Lahari, <strong>Bhopal</strong>. Phone- 5277412
CHARACTERISTICS AND PARAMETERS OF NEW INSULATING OIL Sr.No. Characteristics Unit Requirement 1. Appearance The oil shall be clear, transparent & free from suspended matter or sediments. 2. Density at 29.5°C gm/cc 0.89 3. Kinematic Viscosity at 27° C (max.) Cst 27 4. Interfacial tension at 27oC (Min) N/m 0.04 5. Flash Point (Min) oC 140 6. Pour Point (Max) oC -6 7. Neutralisation value (Total acidity), (Max) mg/KOH/g 0.03 8. Corrosive sulphur : Non-corrosive 9. Electric strength (breakdown voltage) (Min) (a) New untreated oil, kV (rms) 30 (If the above value is not obtained the oil shall be filtered in laboratory). (b) After filtration kV (rms) 60 10. Dielectric dissipation factor (tan δ) at 90°C (Max) 0.002 11. Water content (Max) ppm 50 12. Specific resistance (Min) at900C ohm-cm 35x1012 at27OC ohm-cm 1500 x 1012 13. Oxidation stability a) Neutralisation value (Max) mg/KOH/g 0.4 b) Total sludge after oxidation (Max) mg/KOH/g 0.10% 14. Ageing characteristics after accelerated ageing (open beaker method with copper catalyst). a) Resistivity (Min) at 900C ohm-cm 0.2x 1012 at 270C ohm-cm 2.5 x 1012 b) Tan δ at 90°C (Max) 0.2 c) Total acidity (Max) mg/KOH/g 0.05 d) Sludge content by weight (Max) 0.05% 15 Presence of oxidation Oil shall not contain inhibitor oxidation inhibitor Note: Methods of test shall be as per IS: 335 Prepared By Samvet Lahari, <strong>Bhopal</strong>. Phone- 5277412
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Page 3 and 4: ºlÉÉ{ÉxÉ, Eò¨ÉÒÉËxÉMÉ,
Page 5 and 6: CONTENTS Page No. SECTION 1 GENERAL
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: (vii) MBox, OLTC motor drive, Fans,
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 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 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:
Prepared By Samvet Lahari, Bhopal.
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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