Combined Instrument Transformer

Type VAU up to 550 kV and up to 6000 A

The combined instrument transformer essentially consists of two measuring units: the inductive voltage transformer and the current transformer. Combined instrument transformers are used to step down current and voltage to defined values and thus provide standardized, useable levels of current and voltage in a variety of power monitoring, measurement, and protection applications while insulating the measurement and protection equipment from high system voltage.

Končar has developed combined transformers in 1994 and has since acquired extensive manufacturing and service experience with over 5,000 units installed worldwide. The unique and original single insulation design makes these units stand out in comparison to conventional solutions present on the market today.

The combined transformers are designed with exceptional longevity and reliability, aiming for at least 50 years of service life.

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Features

Um: 72.5 to 550 kV

In: up to 6000 A

Short circuit: up to 100 kA (Idyn: 250 kA peak)

Secondary cores: up to 10

Secondary windings: up to 6

Top core design (low primary winding losses)

Low leakage reactance type

Unique ferroresonance immune design (open type voltage transformer magnetic core)

Explosion-safe - Internal arc resistant

Partial discharge free on power-frequency withstand voltage

Stainless steel bellows oil expansion system

Extreme temperature range available (-60 to +60 °C)

Extensive experience in seismically active regions

Minimum oil design

Maintenance-free

Space and cost savings

General Specifications

Um: 72,5 to 550 kV

In: up to 6000 A

Short circuit: up to 100 kA {Idyn: 250 kA peak}

Secondary cores: up to 10

Secondary windings: up to 6

All metering and protection classes