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Installation: Precautions

This document provides instructions for installing a transformer. It lists precautions that must be taken such as keeping flames away due to the flammability of transformer oil. It describes inspection checks of the transformer components and accessories. It provides directions for installing bushings, turrets, and other accessories. The document also lists the equipment and tools needed for the installation, such as cranes, pumps, and testing devices. It outlines the process for evacuating the tank and processing the oil.

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satya_swamy20002943
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99 views4 pages

Installation: Precautions

This document provides instructions for installing a transformer. It lists precautions that must be taken such as keeping flames away due to the flammability of transformer oil. It describes inspection checks of the transformer components and accessories. It provides directions for installing bushings, turrets, and other accessories. The document also lists the equipment and tools needed for the installation, such as cranes, pumps, and testing devices. It outlines the process for evacuating the tank and processing the oil.

Uploaded by

satya_swamy20002943
Copyright
© © All Rights Reserved
We take content rights seriously. If you suspect this is your content, claim it here.
Available Formats
Download as DOC, PDF, TXT or read online on Scribd
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INSTALLATION

- Sri.J.M.Malik

Precautions:
 Transformer oil is flammable beyond 1400 hence flames should never
kept near transformer
 As far as possible no work should be carried out during monsoon
season to avoid moisture absorption.
 While accessing interior parts workmen should empty their pockets
 Fiber cleaning material should not be used as it reduces insulating
properties. [use clean dry cloth only]
 All components shall be cleaned inside and outside before being fitted.

Inspection checks:
1. Main unit -Gas/oil filled (oil up to the mark level)
 Dirt - Clean.
 Rust - Clean & Paint
 Loose bolts – Tighten
2. All Condenser bushings;
 Physical checks
 Visual cracks/breakage & oil leakage
 Dirt cleaning
 Oil level
 Bushing leads available
3. Bushings
 Any missing metal part & visual check damage
4. Pin/Post insulators
 Dirt cleaning & Any breakage
5. Fans
 Dirt cleaning, physical damage
6. All pipe work
7. Radiators
8. Check all other accessories
9. All other fabricated items, brackets/supports, check physical damage, rust
Verification of placement of main unit:

1
 Physical damage, paint finish.
 Control panels
 Samples from oil drum

Installation of turrets:
 Identify turret as per item no. on outline drawing.
 Verify the terminal nos.of turret CT’s.
 Test the CT for ratio, polarity and insulation resistance.

Installation of Bushings:
 Verify that oil level indicator facing downwards.
 Clean the bushing.
 Physical check for crack/damage.
 Measurement of tan delta & Capacitance
 Ensure connection & verify tightness bushing connectors
 Test tap always be earthed not to be open under any circumstances

Installation of other accessories:


 Conservator with supports
 Piping
 Cooler bank
 On load tap changer with Drive mechanism
 CT terminal boxes

Installation of protective instruments:


 Oil temperature Indicator (OTI),
 Winding temperature indicator(WTI-HV,IV&LV),
 Magnetic oil level gauge(MOG),
 Pr relief device(PRV),
 Buchholz Relay,
 Breather, pumps, fans and RTCC.
 Fire protection system.

2
Installation Check list:
 Revivification of assembly as per check list.

List of Erection Equipments Tools:


 Mobile crane,
 Nylon ropes
 Filter machine
 Vacuum pump
 Storage tank for oil
 Tarpaulin for covering main unit during filtration,
 Complete sets of fixed/ring ended spanners
 Complete sets of Allen keys.
 Set of screw drivers, pipe wrenches, pliers, hammers, ladders, hole
punches
 Devcon putty and holdite
 Oil tests set (BDV kit),
 Meggers (2.5/5kV),
 Multi meters[digital type],
 Carbon tetra chloride,
 Cotton waste,
 Pulling winches/pulleys,
 Steel ropes,
 Steel plates,
 Wooden sleepers,
 Grease,
 Measure tapes,
 Level bottle / level tube,
 Stainless steel bottles for oil samples,
 Nitrogen cylinder with regulator & pr gauge,
 Welding machine,
 Gas cylinder with nozzles and tourch for gas cutting,
 Adapters and valves
 Bushing lifting equipments,
 Vacuum gauge [0-50mbar]

3
Evacuation and oil processing
 Evacuate the tank for 24 hrs or more at 760 mm of Hg.(Ensure
equalizing pipe between OLTC and main tank is open)
 Ready the oil in a separate tank with filtration done with desired oil test
results.
 Filling of oil under vacuum.
Circulation of oil till the desired values of BDV, ppm are achieved.

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