Voltage Transformer EMF (52 - 145/170 kV)

Capable of withstanding the harshest environments

EMF inductive voltage transformers are of single-phase design and intended for connection between phase and ground in networks with insulated or direct-grounded neutral points. It is being manufactured and delivered since the 1950s.

In the EMF version the unique quartz filling minimizes the quantity of oil and allows a simple and reliable expansion system, whilst the EMF-E offers an oil-filled light weight version.

Applications

Revenue metering
Protective relaying
System control and indication of power flow

Why Hitachi Energy?

Our experts can assist and advise you with advice on finding the optimum solutions for your site conditions
Designed for a wide range of conditions, from polar to desert climate

Brief performance data

		EMF	EMF -E
Installation		Outdoor	Outdoor
Design		Inductive type	Inductive type- light version
Insulation		Oil-paper quartz	Oil-paper
Highest voltage for equipment	kV	52 - 170	52 -145
Voltage factor (Vf)		Up to 1.9/8 hrs	Up to 1.9/8hrs
Insulators		Porcelain/polymeric	Porcelain/polymeric
Creepage distance	mm/kV	≥ 25 Longer on request	≥ 25 Longer on request
Ambient temperature	ºC	-40 to +40 Others on request	-40 to +40 Others on request
Design altitude	m	Maximum 1000 Others on request	Maximum 1000 Others on request

Get to know more

In earthquake prone areas, high voltage equipment must withstand the tremendous seismic stresses caused by earthquakes. Normally, calculations are performed to see how well the equipment withstands these stresses. But if the customer requests it, the calculations can be verified with a shaking table test.

This video shows seismic testing performed on current transformers with porcelain, as well as polymeric insulators. During the test the instrument transformers are submitted to forces of from 0,5 - 1g, according to IEEE standard.

Watch video - low resolution (42,03 MB)

Watch video - high resolution (245,56 MB)