ABB UBB Series User Manual

On-load tap-changers, type UBB
Installation and commissioning guide
1ZSE 5492-118 en, Rev. 4

ABB UBB Series Specifications

General

Product Type	Busbar
Rated Current (In)	6300 A
Standards	IEC 61439-1
Material	Copper or Aluminum
Protection Degree	IP00 (Busbar itself), Dependent on Enclosure

Summary

1. Introduction

1.7 Tightening torque

Specifies recommended tightening torques for various bolt sizes.

2. Receiving

2.2 Inspection upon receiving

Procedure for checking for transport damage and verifying delivery against documents.

3. Installation in the transformer

3.1 Cover-mounting

3.1.1 Connection to outside terminals

3.2 Yoke-mounting

3.2.1 Mounting of the on-load tap-changer when transformer ratio measurement is carried out before drying

Procedure for yoke-mounting with pre-drying transformer ratio measurement.

3.2.2 Mounting of the on-load tap-changer when transformer ratio measurement is carried out after drying

Procedure for yoke-mounting with post-drying transformer ratio measurement.

3.2.3 Mounting to the transformer cover from the yoke

Steps for mounting the tap-changer to the transformer cover after it has been on the yoke.

4. Drying

5. Final assembly

5.1 Mounting of the motor-drive mechanism

Instructions for attaching the motor-drive mechanism to the transformer.

5.3 Mounting of external drive shafts

Procedures for connecting the drive shafts between the tap-changer and motor-drive.

5.3.1 Mounting of horizontal drive shaft

5.3.2 Mounting of vertical drive shaft

5.5 Before operation

5.5.1 Transformer ratio measurement after drying

Procedure for performing transformer ratio measurement after drying.

6. Pressure relay

6.2 Installation

Instructions for installing the pressure relay onto the tap-changer.

6.3 Checking at commissioning of the transformer

Procedure for testing the pressure relay during transformer commissioning.

7. Oil filling

7.1 Filling methods and restrictions

7.2 Filling at atmospheric pressure

7.3 Filling under vacuum

7.4 Correct oil level

Guidance on achieving and maintaining the correct oil level in the conservator.

7.5 Restoring the gas cushion

8. Electrical connection and testing

8.2 Connecting and testing

Detailed instructions for electrical connections and initial tests.

8.3 Electrical tests on transformer

10. Commissioning

10.3 Electrical connection and testing

Guidance on wiring and performing electrical tests during commissioning.

10.4 Putting into operation