Repair and maintenance of oil-immersed power transformers

ABP Plyuch specialists will carry out repair and maintenance work on oil-immersed power transformers TM and TMZ for transformer substations: repair and replacement of regeneration of oil, bushings, attachments, gas protection, off-circuit tap-changers (anzapfs), taps, outputs, contact connections of the active part of the transformer, LV and HV windings, rubber seals and bolted connections.

Our principles for solving the assigned tasks

Flexibility and speed in decisions
Energy efficiency
Environmental Safety

Repair and maintenance of power oil transformers Kiev, Ukraine

Modern and reliable power supply and automation solutions

for offices and business centers

for cafes, restaurants, hotels

for a private house and apartments

for shops and shopping and entertainment centers

for banks and financial institutions

for manufacturing enterprises

for educational centers and institutions

for medical centers

Repair and maintenance of power oil transformers

Enterprises that have TP (transformer substations) and KTP (complete transformer substations) with oil-immersed power transformers TM and TMZ in their electrical facilities (on the balance sheet) are faced with the need for maintenance and / or repair.

Standard periodic maintenance of oil transformer by “AVR PLUS” specialists

topping up oil;
replacing the silica gel in the thermosyphon filter;
cleaning the transformer and insulators from dust and dirt;
tightening contacts and bolted connections;
routine measurements;
visual inspection;
application (update) of operational inscriptions and markings;
preparation of a technical report.

Types of repair of power transformers

According to the purpose, scheduled preventive and post-accident repair of transformers are distinguished; after 10–15 years of operation, in addition to scheduled repairs, the unit is also reconstructed. Depending on the volume and complexity of work, there are three categories of repair of transformer equipment:

overhaul of power transformers – required in case of serious malfunctions, wear and tear of equipment, usually carried out in service centers at specially equipped sites;
current or operational repair – preventive work aimed at optimizing the operating mode and extending the life of the equipment;
Maintenance – scheduled.

How transformers are repaired

The current repair of power oil transformers is usually carried out on site with the equipment turned off and takes no more than two days. Repair and maintenance work at transformer substations is carried out at least once a year according to the standard scheme:

visual inspection for surface defects;
cleaning the body from dirt, updating the paintwork;
revision of the active part without disassembly;
minor repairs of fittings, cooling system and attachments;
adjustment of fasteners, refueling of oil;
replacement of silica gel, filters, gaskets and fuses;
detection and elimination of leaks; drying the active part;
measurement of winding resistance, taking readings of a combined pressure and vacuum gauge.

If necessary, overhaul of transformers is carried out with dismantling of the active part. After a long transportation, it is recommended to inspect the transformer with an opening. During the overhaul, damaged large components are replaced – the magnetic system, inputs, outlets, windings, fans, switches, valves, etc.

Emergency repair and maintenance of power oil transformers

If an accident occurs during operation or the output electrical characteristics do not correspond to the required parameters or there are visible defects and oil leaks, increased (uneven) noise, it is necessary to carry out work on the diagnosis of malfunctions by measurements, tests, visual inspection, followed by drawing up a defective act and agreement on the possible cost of work, since in some cases the cost of repairs can be correlated with the cost of a new transformer.

Often it is possible to make a final diagnosis only after opening the transformer and removing the active part. Depending on the nature of the malfunction and local conditions, we decide whether to carry out repairs on site or in a repair shop. For transportation to the workshop, we take out the transformer for repair, turn it off, carry out dismantling and rigging work.

How transformers are maintained

The frequency and scope of maintenance of transformer installations largely depends on the design and operating conditions. Service maintenance of air-cooled power transformers most often comes down to periodic inspection of the case and removal of dust every six months, and in case of heavy dustiness – once every three months.

If forced ventilation is installed in the power unit, check the fans and thermostat twice a year. During external inspection, pay increased attention to insulation and connections; there should be no cracks, chips and rust on the surface of metal elements.

Maintenance of oil transformers involves monitoring the temperature, pressure and oil level, to control the health of the equipment, testing of alarms and instrumentation is carried out; counter readings must correspond to the number of switchings. If necessary, take oil samples from the tank; once a year it is recommended to change the oil in the shutter and clean the outer surfaces from oil stains.

Standard Emergency Repair Kit

replacement or regeneration of transformer oil (bringing the technical characteristics of the oil to standard);
replacement of bushings;
replacement or repair of transformer attachments;
repair, elimination of external defects and painting of the expansion tank and transformer tank;
replacing rubber seals;
repair / replacement of gas protection;
replacement / repair of PMB (anzapfa);
revision, replacement or repair of taps, outputs, contact connections of the active part of the transformer;
repair of LV and HV windings;
repair / replacement of bolted connections.

After repair, we perform output tests and measurements, prepare a technical report, delivery to the installation site, installation, connection and measurement of the transformer parameters before energizing.

In the event of an emergency, it is extremely important to determine the causes and eliminate them (why it happened, why the protection equipment did not work) in order to avoid emergency situations in the future.

For convenience, we perform work on weekends and after hours.

Timely maintenance, diagnostics and repair of power transformers significantly reduces the likelihood of emergencies in the power supply system of your enterprise.

Certificates and Licenses

Schneider Electric Panel Builder Certificate

Official panel builder of Schneider Electric certificate

List of types of construction works

Перечень видов работ по строительству объектов

License of the State Architectural and Construction Inspection of Ukraine

Лизензия государственной архитектурно-строительной инспекции Украины

Work permit

Own production

Our own high-tech production, cooperation with manufacturers of reliable and modern components, as well as extensive experience in projects of various levels of complexity allows us to implement the ideas of our clients at reasonable prices.