MEHRU established in the year 1997, is an ISO 9001:2008 and ISO 14001:2004 certified company, manufacturing Instrument Transformers upto 420KV.
The products manufactured by MEHRU incorporate the best and most modern technology, to ensure a good quality product. The design of Instrument Transformers, are time tested designs over a period of several decades. All the Instrument Transformers have been type tested as per IEC/IS and ANSI standards. Instrument transformers have also been type tested for Seismic Withstand test at 0.5G on all 3 axis & fast transient (Multiple chopped impulse) Test.
The Testing Lab is equipped with most latest equipments to carry out all routine tests as per IEC /IS/BS/AS and ANSI standards.
MEHRU is one of the leading suppliers of Instrument Transformers to numerous clients not only in India but all over the world.
Outdoor oil cooled instrument transformers are paper insulated oil impregnated type insulation & Winding is done by automatic machines in extremely controlled dust free environment.
Outdoor oil cooled instrument transformers are hermetically sealed type in construction. The whole CT/PT unit is dried in an air heating oven under very high vacuum & strictly controlled conditions. Measurement of amount of moisture taken out from the CTs/PTs is done at regular intervals during the vacuum drying process. After the process is over the CT/PTs are filled with filtered, de-aerated EHV grade transformer oil under vacuum.
The oil filtration plant, the processed oil storage tank & the vacuum drying chambers are all interfaced together to ensure that the CTs/PTs are filled with oil untouched by human hand. To seal the CT/PTs the space left for expansion on the top is filled with dry & pure -nitrogen gas through a non -returnable valve at pre determined pressure.
On request Mehru can also supply CTs/PTs with stainless steel bellows instead of nitrogen gas cushioning.
The instrument transformer are special type of transformers these transformers are defined as the transformer intended to supply measuring instruments, meters, relay and other similar apparatus.
ReplyDeleteIn the measuring large current in a do circuit current and voltage is measured by using low range ammeter with a suitable shunt. For measuring high voltage high resistance is used in parallel.
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