Introduction

Transformers, whether oil-immersed or dry-type, are crucial components of the electrical system. Their failure can be costly and dangerous for other main equipment and personnel alike. The design and operation of any transformer must meet specific requirements to withstand electrical, thermal, and mechanical stresses during its service life. Testing and maintenance of transformers, according to relevant standards, aim to ensure that the transformer will perform trouble-free for many years under the conditions likely to be encountered after installation.

Focus Areas of the Training Course:

Design and installation details.

Methodology of choosing dry-type or oil-immersed transformers.

Maintenance and operation procedures.

Fault detection and repair checklists.

Inspection, diagnosis, and maintenance techniques.

Training Program Objectives:

Participants will be able to:

Describe various types of transformers.

Understand the importance of transformer maintenance.

Analyze different transformer test results.

Classify transformer cooling methods.

Recognize how to design and select transformers.

Target Audience:

Electrical engineers.

Electrical supervisors.

Electricians.

Professionals responsible for operation, maintenance, and fault-finding techniques.

Employees with a limited scope of electrical maintenance work.

Scientific Content of the Training Program:

General Principles:

Electrical transformers in the electrical system.

General classification and types of transformers.

Transformer operation theory.

Voltage and current transformers.

Winding and connections of electrical transformers.

Parallel operation requirements for transformers.

International standards for transformers and types of requirements.

Tap changers.

Transformer Components:

Transformer oil characteristics.

Transformer oil problems and protection systems.

Current transformers.

Voltage transformers.

Industrial application transformers.

Internal and external cooling of transformers.

Construction of transformer cooling systems and their details.

Transformer Properties and Thermal Performance:

Thermal performance and periodic rating of transformers.

Short-circuit current withstand capability.

Efficiency and losses of electrical transformers.

Types of windings and iron cores.

Transformer tanks and cooling fins.

Sound levels and noise in transformers.

Gas-insulated transformers.

Transformer protection.

Transformer Operation and Maintenance:

External voltage adjustment and tap changers.

Grounding protection for distribution transformers.

Maintenance procedures for transformers.

Condition-based maintenance for transformers.

Manufacturer guidelines for transformer care.

Remote monitoring of transformers (Online/Remote Monitoring).

Transformer Testing and Fault Detection and Repair:

Identifying transformer faults and repair methods.

Site acceptance tests for transformers.

Routine tests for transformers.

Measurement of winding resistance and voltage ratio.

Insulation resistance tests.

Factory tests for transformers.

Partial discharge tests and analysis of results.