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UBBRT
ABB UBBRT User Manual
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10
1ZSE 5492-118 en, Rev
. 4
fm_00235
Bottom
Bottom valve
drain screw
Moving contacts
Fixed contacts
Fixed contacts
Moving contacts
Change-over selector:
Selector switch:
Cylinder
Flange
Bevel gear
Oil valve
Selector switch shaft
Fig. 2. General arrangement of on-load tap-changer
, type UB.
T
ransition r
esistor
Current collector
terminal
Shielding rings
Indicator window
Air release valve to on-
load tap-changer
Connection to oil
conservator
Pressur
e relay
Air release valve
to transformer tank
T
op cover
1
Introduction
9
11
Table of Contents
Default Chapter
7
Table of Contents
7
1 Introduction
9
Required Tools
11
Required Material
11
Oil
11
Oil Conservator
11
Oil Filter Unit for Continuous Oil Filtration
12
Weights
12
Tightening Torque
12
2 Receiving
13
Unpacking
13
Inspection Upon Receiving
13
Temporary Storage before Assembly
13
3 Installation in the Transformer
14
Cover-Mounting
14
Connection to Outside Terminals
15
Yoke-Mounting
16
Mounting of the On-Load Tap-Changer When Transformer Ratio Measurement Is Carried out before Drying
17
Mounting of the On-Load Tap-Changer When Transformer Ratio Measurement Is Carried out after Drying
19
Mounting to the Transformer Cover from the Yoke
21
4 Drying
24
Observations before Processing
24
Observations after Processing
24
5 Final Assembly
25
Mounting of the Motor-Drive Mechanism
25
Mounting of Accessories
28
Mounting of External Drive Shafts
29
Mounting of Horizontal Drive Shaft
31
Mounting of Vertical Drive Shaft
33
Connection to the Oil Conservator
36
Before Operation
36
Transformer Ratio Measurement after Drying
37
6 Pressure Relay
38
General
38
Installation
38
Checking at Commissioning of the Transformer
39
7 Oil Filling
40
Filling Methods and Restrictions
40
Filling at Atmospheric Pressure
40
Filling under Vacuum
41
Correct Oil Level
41
Restoring the Gas Cushion
42
8 Electrical Connection and Testing
43
General
43
Connecting and Testing
43
Electrical Tests on Transformer
44
After Energizing
44
4
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ABB UBBRT Specifications
General
Brand
ABB
Model
UBBRT
Category
Industrial Equipment
Language
English
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