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Current transformer LVB / IMT (40.5 - 550 kV)

Reliable oil-insulated top core design current transformer for outdoor use

LVB/IMT oil-insulated current transformer for outdoor installations are based on a top core design with metallic expansion bellow. All our current transformers are built-to-order to customer specifications. Their optimized design withstands a wide range of primary currents and meet customers’ demand on high current rating, low temperature rise in operation, strict control compression ratio and compressive strength with multi-limit safe sealing.

The LVB/IMT is a reliable product with minimum maintenance and suitable for wide range of environmental conditions.


  • Revenue metering 
  • Protective relaying
  • System control and indication of power flow

Why Hitachi Energy?

  • Optimized insulation design and processing technic for enhanced reliability with outstanding insulation
  • LVB/IMT current transformer can meet the requirements for large capacity of power system and reclosing operation with transient protection windings
  • It is designed for wide range of environmental conditions from tropic to polar climate

Brief performance data

Installation Outdoor
Design Top-core type
Insulation Oil-paper
Highest voltage for
40.5 - 550 kV
Max. primary current Up to 4000 A
Short-circuit current Up to 63 kA/3s
Insulators Porcelain (silicon rubber optional)
Creepage distance ≥ 31 mm/kV (longer on request)
Service condition  
  • Ambient temperature
-40 ºC to +40 ºC (standard)
  • Design altitude
Maximum 1000 m (standard)
  *Other temperatures and altitudes are possible
Accuracy Meets all IEC andIEEE metering and protection classes

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