ABB ILUJ000004-BLE - User Manual

ABB Inc.
Instruction Booklet Distribution Transformers
Jefferson City, MO
ISO 9001 Certified
I.B. 46-060-1, Section E
ILUJ000004-BLE
Effective: January, 2008
Instructions for Secondary
Unit Substation Transformers
150-3000 KVA, Three Phase
1.0 INTRODUCTION
These instructions apply to liquid filled secondary unit
substation transformers manufactured by the ABB
Transformer Facility at Jefferson City, Missouri.
Secondary Unit Substations are typically composed of
three (3) major sections: the high or medium voltage
section; transformer section; and low voltage section.
These sections can be close coupled whereby the sections
are bolted directly together to form a single line of electrical
equipment or the sections can be separated by distance
and connected by conduits or electrical buss work. These
instructions only apply to the transformer section. Please
refer to instruction books for adjoining sections where
applicable.
The transformers described herein are designed for the
conditions normally encountered on electric utility power
distribution systems. As such, they are suitable for use
under the “usual service conditions” described in ANSI
C57.12.00 (General Requirements for Liquid-Immersed
Distribution, Power and Regulating Transformers). All other
conditions are considered unusual service and should be
avoided.
2.0 SAFETY
WARNING: READ THIS INSTRUCTION BOOK
CAREFULLY BEFORE ATTEMPTING TO
INSTALL, MAINTAIN, OPERATE OR SERVICE
THE TRANSFORMER. FAILURE TO FOLLOW
INSTRUCTIONS CAN CAUSE SEVERE INJURY,
DEATH, OR PROPERTY DAMAGE.
Keep this Instruction Book available to those responsible
for the installation, maintenance, operation, and service of
the transformer. Safety as defined in this Instruction Book
involves two conditions:
Personal injury. 1
Product or property damage. 2
SEE IMPORTANT “DISCLAIMER OF WARRANTIES AND
LIMITATION OF LIABILITY” ON PAGE 8.
Safety notations, intended to alert personnel of possible
personal injury, death or property damage, have been
inserted in the instructional text prior to the step in which
the condition is cited. These safety notations are headed by
one of three intensity levels which are defined as follows:
DANGER 1 – Immediate hazard which
will cause severe personal injury, death, or
substantial property damage.
WARNING 2 – Hazard or unsafe practice
which can cause severe personal injury, death or
substantial property damage.
CAUTION 3 – Hazard or unsafe practice
which will or can cause minor personal injury or
minor property damage.
The transformer should be operated and serviced only by
competent personnel, familiar with good safety practices.
These instructions are written for such personnel and are
not intended as a substitute for adequate training and
experience in the use of this equipment. Should clarification
or further information be required, or should problems arise
which are not covered sufficiently for the user’s purpose,
refer the matter to ABB Inc. When communicating with ABB
regarding the product covered by this Instruction Book,

Summary

Introduction to ABB Unit Substation Transformers

Transformer Safety Guidelines

Safety Notation Levels

Defines DANGER, WARNING, and CAUTION levels for safety alerts in the manual.

Receiving and Handling Procedures

External Inspection and Oil Level

Oil Level and Refilling

Checking the oil level gauge, identifying leaks, and refilling with approved oil.

Installation Procedures

Internal Tank Inspection Requirements

Guidance on internal inspection if the transformer is opened, emphasizing moisture prevention.

Storage Conditions and Pressurization

Recommended storage practices, including foundation, stacking, and air pressurization.

Mounting Procedures

Guidelines for mounting the transformer on a level pad, considering tilt and seismic conditions.

Transformer Location Considerations

Factors for locating transformers, including oil type, fire risk, and proximity to buildings.

Venting Procedure

Instructions for manually venting the transformer using the pressure relief device.

Grounding Requirements

Essential steps for properly grounding the transformer tank before energizing.

Connection and Operation Details

Connection Sequence and Best Practices

Recommended order for making connections and avoiding strain on terminals.

Secondary Termination Checks

Ensuring tight secondary termination joints and using backup nuts for contact.

Liquid Level Management

Critical warning about operating below the specified liquid level and handling temperature effects.

Air Terminal Chamber Security

Procedures to ensure the air terminal chamber is properly closed and secured.

Operational Standards and System Integration

Overview of operational standards, system protection, and coordination for unit substations.

Transformer Components and Adjustments

Bushing Inspection and Handling

CAUTION regarding dirt, foreign material, and shipping caps on bushings.

Separable Insulated Connectors

Description of connectors, their types, and installation requirements.

Porcelain Bushing Details

Information on externally clamped, gasketed porcelain bushings with terminals.

Fuse Locations

Typical locations for fuses within unit substations.

High Voltage Switch Locations

Typical locations for high voltage line switches in unit substations.

Tap Changer Operation

Procedure for de-energizing and operating the externally operated tap changer.

Dual Voltage Switch Operation

Steps for de-energizing and changing the voltage position on a dual voltage switch.

Transformer Monitoring and Control

Nameplate Information

Importance of the nameplate for transformer ratings and connections.

Control Cabinet Safety

Warning about control cabinet power and grounding before performing work.

Surge Arrester Function

Purpose of surge arresters in diverting over voltage transients.

Pressure Relief Device Operation

Manual operation of the pressure relief device to release internal tank pressure.

Thermometer Functionality

How the thermometer indicates liquid temperature and the highest attained temperature.

Liquid Level Gauge

Indicator for liquid level variation from the 25 degree C level.

Pressure-Vacuum Gauge

Gauge indicating positive or negative pressure in the tank's gas space.

Cooling Fan Operation Modes

Explanation of Manual and Auto modes for cooling fan operation.

Maintenance and Repair

Current Transformer (C.T.) Safety

Warning about connecting C.T. secondaries to a load or shorting them.

Periodic Maintenance Checks

Recommended visual inspections for components like bushings, arresters, and enclosures.

Hazardous Condition Response

Action to take when broken parts, oil leaks, or hazardous conditions are observed.

Oil Sampling Procedure

Safety warning for taking oil samples after de-energizing and venting.

Repair Responsibility and Parts

Owner's responsibility for maintenance and using ABB approved replacement parts.

Internal Part Replacement

Guidance on replacing internal parts, including draining fluid if necessary.

Core and Coil Assembly Repair

Information on core and coil assembly repair or replacement by ABB personnel.

Tank Finish Maintenance

Procedures for cleaning, priming, and repainting tanks with rust or deterioration.

Load Monitoring

Importance of checking load to prevent excessive overload, following ANSI guidelines.

Disclaimer of Warranties and Liability

ABB ILUJ000004-BLE Specifications

General

Category	Transformer
Type	Dry-type transformer
Manufacturer	ABB
Dry-type transformer	Yes
Cooling Method	Air
Standards	IEC 60076