IENOT

Transformer Department offers:

Research services

Computer services for processes and objects, hardware and software.
Diagnostic of power transformers:
- technical condition of transformers including post-failure possibility for further operation,
- diagnostic systems based on off-line measurement with an expert system,
- on-line monitoring and diagnostic systems.
Databases for users of transformers.
Estimation of power transformers designe in wide range of power and of voltage. Among others we offer:
- modern insulating systems,
- detailed verification from short-circuit strength point of view, also of non-cylindrical windings,
- design of large power transformers with low level of losses, and limited local heating,
- modern dry and oil reactors, screening systems,
Packages for operating and long term loading forecasting.
Various tests and measurement on transformers and reactors.
Expertises dealing with:
- technical - economic analysis related to repair, refurbishment or replacement of transformers,
- determination of reasons of transformer faults.
Analysis of mechanical strength of steel elements and of and under pressure tanks.
Designing and production of special current measuring and protection transformers, especially installed inside of large power transformers, with accuracy class 0.2 and 0.5.
Investigation for drying and impregnation processes of materials and devices, including engineering of the process.
Engineering investigations of materials and insulation systems.
Investigation of influence of the processes upon dielectric strength and mechanical parameters of materials and insulation systems.
Investigation of influence of magnetic and electric insulation materials used on specifications of operation of and power and special transformers and reactors.

Project services

Calculation and designing of special transformers and power and special reactors, including units for converter and traction systems.
Calculations and designing of special power - electronic systems.
Designing of technological plants for manufacturing and repairs of transformers and reactors.
Designing of control and measuring systems.

Recently realized

Measurement of hot spot temperature in transformer windings by means of fibre optic devices.
Computer aided location of hot-spot in a transformer coil at quasi - stationary and dynamic loading.
Computer aided verification of short-circuit withstand of transformers when designing with taking into account non-linear characteristics of materials and results of model investigation.
Designing analysis upon profitability of refurbishment or replacement by a new unit of large power transformers and reactors, including:
- technical and economic analysis advisability of repair step-up transformers 240 MVA 110, 220 and 400 kV and step-up transformer 68 MVA/110 kV. Refurbishment of station transformer 25 MVA/15 kV, connected with improvement of its short-circuit withstand and reliability over operation,
- analysis dynamic and thermal phenomena in cores of large power shunt reactors with "slice" legs,
- analysis phenomena in tank magnetic shunts, directed to optimal design solution,
- analysis of currents in grounding connections of core to clarify reasons of damage of 240 MVA transformer.
Design of Test Station for distribution transformers.
Design, manufacturing and putting into operation a vacuum drying and oil treatment plant, with usage of windings heating by low frequency current.
Design, manufacturing and putting into operation a system for measurement of partial discharges with computer aided noise elimination.
Investigation of static electrification phenomena in power transformers.
On-line drying of insulation system of power transformers.
Transformers and special reactors for traction power-electronic devices.
System for on-line water content measurement in transformer oil.
Series of stationary and mobile devices for insulating oil treatment of nominal capacity from 500 l/h to 10000 l/h.
Distribution transformers with very low loss level and cores from amorphous steel.