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Combined current/voltage transformer type JXM

Compact outdoor, oil-filled, distribution class wide range, high accuracy wound type metering unit

JXM outdoor rated distribution class oil-filled current/voltage transformers are compact wound type single phase metering transformers intended for high accuracy revenue metering. These current/voltage transformers are built-to-order to customer specifications. JXM transformers can meet most revenue metering applications due to the special wide range capability of the design 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 JXM provides reliable performance in service due to the conservative insulation system used at the lower distribution voltages.


  • Wide range high accuracy revenue metering
  • Independent power production 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 wide range performance provides 0.15 percent accuracy from 0.5 percent nominal current to 400 percent nominal current for any practical span of metering for most 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 wide range 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 ≥ 20 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 class 0.15s  

IEC CI 0.2s on request  

(0.15s stable from 0.5% to 400% Nominal current - 1200 maximum)
  •  VT
Meets IEEE 0.15%Z and 4000VA thermal

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