Dry Type Transformer

Dry Type Transformers

We are one of the most significant producers of Dry Type transformers. Our expertise is in the production of Dry Type transformers up to 440 V to 33 kV (75 kVA to 5000 kVA) and we are constantly involved in R&D for better and future-ready products. UNITRANS POWER LLP is capable to serve high quality products, with excellent performance with various applications.

• WHAT IS A TRANSFORMER?

The transformer is an electric electromagnetic induction machine whose function is to transfer electrical power between two different voltage systems at the same frequency.

• WHY DRY TYPE TRANSFORMER ?

There are two types of DRY type transformer one of them known as cast resin Transformer and another is known as vacuum pressure impregnated transformer,

CAST RESIN DRY TYPE TRANSFORMER

It is used in the high moisture prone areas. It is because of its primary and secondary windings are encapsulated with epoxy resin. This encapsulation helps to prevent moisture to penetrate to affect the winding material. Complete protection is achieved by this cast resin encapsulation so that the Transformer can work without disruption in highly moisture prone area. Thus this transformer is non-hygroscopic.

VACUUM PRESSURE IMPREGNATED TRANSFORMER

This ape of transformer is made by minimum flammable material it is a man insulation of HVLV windings. This type of transformer made from Foil or Strip in continuous layer. However in higher voltage the winding is made by disk winding pattern, The insulation of winding is void free varnished impregnation under high vacuum. Varnish Insulation will be used as per customer’s requirements in class of F or H.

To seleH the correct type of transformer, it is necessary to know it’s different eleHrical and thermal properties. Another key parameter, when selecting the transformer is the type of operation for which it is intended. Dry Type transformers technical comparison over oil cool transformer.

PROPERTIES	Oi I Cooled Transformer	Cast resin DRY type Transformer	Vacuum pressure impregnated Transformer
Regular Maintenance	YES	NO	NO
lnflamibility	YES	NO	NO
Environmental Pollution	YES	NO	NO
Short Circuit mechanical and thermal farces withstand capability	NO	YES (Due to solid casting of HV & LV)	YES (Due to solid casting of HV & LV)
Special commissioning procedure	YES	NO	NO
Risk of environmental pollution due to leakages of I]quid	YES	NO	NO
Self-extinguished in case of fire hazard due to electrical fault	NO	YES	YES
Temperature withstand capability due to overloading (up to 155 C, Insulation Class F)	N0	YES	YES
Anti-fire system Requirement	YES	NO	NO
Partial discharge Free	No	YES	YES

• Application

Dry Type transformers can be used in a wide range of applications and represent the most reliable answer for distribution systems, power production, rectification, traction and for special solutions such as beneath.

INDUSTRY	TRACTION	SERVICE SECTOR	MARINE	RENEWABLE ENERGY
Automative	Railway	Hospitals	Cruise ships	Wind parks
Mechanical	Tramway	Hotels	Multifunctional ships	Solar power station
Chemical		Banks	LNG Carriers	Hydroelectric Power
Paper mills Foundries		School Shopping CentreS	Offshore Drilling rigs

• IMPORTANT FACTORS OF OUR DESIGN

Let us explain in brief the important design parameters for a dry type transfo r mer. Choice of Insulation Type: Generally F and H class of insulation of insulation is used to insulate the primary and secondary winding. It is because these classes have high temperature withstand property, i.e. 155°C for F and 180”C for H class of insulation. Apart from the temperature withstand capability, mechanical strength; dielectric strength and resistance to thermal shock are the basic capabilities that have to be fulfilled by the insulation selected for the windings.

• QUALITY CONTROL

UNITRANS POWER LLP, quality control was carried out according to lSO9O01:2015quality, management and production standard. Each product is being inspected and tested by Engineers, auditors and QA inspectors according to the production standards and requirements set before it gets into the next process/stage. The product’s quality and reliability are ensured by our qualitative management procedure, serious working attitude and advanced testing equipments.

OUR TESTING FACILITIES FOR EXCELLENT QUALITATIVE SUPPLY TQ OUR VALUED CUSTOMERS

• ROUTINE TESTS (As per National and International Standards)

Following tests are carried out on all transformers at the end of manufacturing

TYPE TEST (In-house)

Full wave LIV Test
Temperature rise test

Dielectric Routine Tests

DVDF TEST
HV TEST an Primary winding and Secondary winding

SPECIAL TEST (In-house)

Noise level measurement
Chopped LIV Test