Repairs And Adjustments; Replacement Of Gasket Between Insulating Board And Selector Switch Unit; General; Tools Required - ABB UZE Repair Manual

3. Repairs and adjustments

For Contact replacement see Maintenance Guide.
For Adjustment of Disc Brake see Maintenance Guide.
For Replacement of Gasket between on-load tap-changer tank and Transformer
tank see Installation and Commissioning Guide.

3.1 Replacement of gasket between insulating board and selector switch unit

3.1.1 General

This instruction guides you how to replace the gasket between the insulating board and the
selector switch moulding. The instruction can be used for both UZE and UZF on-load tap-
changers.
ABB recommends that only maintenance engineers trained by ABB carry out replacement of
gasket between barrier board and selector switch unit.

3.1.2 Tools required

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3.1.3 Material and spare parts required

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1ZSE 5492-128 en, Rev. 4
Pump with connection fitting the oil valve
Box wrench (19 mm)
Electric drill, set of drills
Thread tap M16
Chisel (as used by a woodworker)
Dynamometric wrench (up to 42 Nm)
Tool with a prolonged shaft for square nuts (27 x 27 mm)
Maintenance Guide
Clean and empty drums (for oil draining)
Rags (not cotton waste)
Rope (approximately 2 m)
Wooden wedges, made of birch wood or similar, rather hard wood (length approx.
100 mm, width approximately 40 mm, and thickness approximately 20 mm)
Ethylacetate or similar solvent
Distance pieces of wood or pressboard (thickness of approximately 9 mm)
Single-phase diagram valid for the actual on-load tap-changer
Glue, nitrile rubber adhesive, preferably of type "Pliobond 20" (Good Year)
Brush for application of adhesive
Gasket
Grease for ball-bearings
Brush for grease
Polyvinylacetate adhesive (normal glue for wood)
18 stud bolts and 18 nuts
Tools and materials for draining transformer oil according to the transformer documen-
tation.
CAUTION
3 Repairs and adjustments
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