Choose your region and language



Combined current/voltage transformer type JS

Compact outdoor, oil-filled, distribution class wound type metering unit

JS outdoor rated distribution class oil-filled current/voltage transformers are compact wound type single phase metering transformers intended for revenue metering. These current/voltage transformers are built-to-order to customer specifications. JS transformers can meet many standard revenue metering applications with up to two independent cores from 15 kV up to 38 kV. This combined housing is available with ANSI 70 gray porcelain insulator considered as the standard product. Hermetic sealing of the design is accomplished using a gas cushion above the oil in the tank to prevent free-breathing outside moisture-ladened air.

The JS provides reliable performance in service due to the conservative insulation system used at the lower distribution voltages.


  • Revenue metering
  • Check or indication metering

Why Hitachi Energy?

For revenue metering on critical loads, this conservative oil-paper insulated current/voltage transformer is extremely reliable for lower voltage applications where users have experienced problems with dry type units. The stable accuracy performance provides 0.3 percent accuracy metering for many revenue installations. Given the flexible construction, the design is very adaptable for meeting the most demanding applications. Hitachi Energy offers our users unique advantages as follows:

  • Excellent application engineering support to ensure the optimum solutions
  • Designed for environmentally diverse conditions
  • Designs specific to critical applications for single phase revenue metering
  • Distribution style format offers durable self-healing oil insulation for lower voltage use
  • Dielectrically stringent production features hermetically sealed design with 100% partial discharge testing

Brief performance data

Installation Outdoor
Design Wound (tank) type
Insulation Oil-paper
Highest voltage for equipment 15 - 38 kV
Maximum primary current Up to 1,200 A & up to 175/300:1 VT ratios
Short-circuit current Up to 90 kA/1 sec & VF=1.9x-8Hrs
Insulators Porcelain
Creepage distance ≥ 25 mm/kV (longer on request)
Service condition  
  • Ambient temperature
-40ºC to +40ºC (standard)
  • Design altitude
Maximum 1000 m (standard)
  *Other temperatures and altitudes are possible
  •  CT
Meets all IEEE metering classes (0.3% or 0.15%)  

IEC CI 0.2s on request  

(4000A maximum)
  •  VT
Meets IEEE 0.3%ZZ and 4000VA thermal

Something caught your eye?

Our sales team will get in touch with you