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Combined three phase current/voltage transformer type MXM

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

MXM outdoor rated distribution class oil-filled current/voltage transformer are compact wound type three phase metering units intended for high accuracy revenue metering.  These current/voltage transformers are built-to-order to customer specifications.  MXM transformers can meet most revenue metering applications due to the special wide range capability of the design with up to two (2) independent cores per phase from 15 kV up to 46 kV.  This three phase combined housing is available with ANSI 70 gray porcelain insulators as standard.  Hermetic sealing of the design is accomplished using a gas cushion above the oil in the tank to prevent free-breathing outside moisture-laden air.

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

Applications

  • Wide range high accuracy revenue metering
  • Independent power production metering

Why Hitachi ABB Power Grids?

For three phase revenue metering on critical loads, this conservative oil-paper insulated current/voltage transformer is extremely reliable for this lower voltage application where users have experienced problems with dry type units.  The wide range performance provides 0.15% accuracy metering from 0.5% nominal current to 400% 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.  ABB offers our users unique advantages as follows:

  • Excellent application engineering support to ensure the optimum solution for the success of your projects
  • Designed for environmentally diverse conditions - polar to desert
  • Designs specific to critical applications for three phase wide range metering
  • Distribution style format offers durable self-healing oil insulation for lower voltage use, providing superior performance at a competitive price
  • Dielectrically stringent production features hermetically sealed design with 100% partial discharge testing

Brief performance data

MXM  
Installation Outdoor
Design Wound (tank) type
Insulation Oil-paper
Highest voltage for equipment 15 - 46 kV
Maximum primary current Up to 1,200 A & up to 400/693:1 VT ratios
Short-circuit current Up to 90 kA/1 sec & VF=1.9x-8Hrs
Insulators Porcelain
Creepage distance ≥ 20 mm/kV (longer by request)
Service condition  
  • Ambient temperature
-40ºC to +40ºC (standard)
  • Design altitude
Maximum 1,000 m (standard)
  *Other temperatures and altitudes are possible
Accuracy  
  •  CT
Meets all IEEE wide range high accuracy metering class 0.15s.
*0.15s stable from 0.5% to 400% nominal current - 1200 A max

IEC CI 0.2s on request  
  •  VT
Meets IEEE 0.15% Z and 4000VA thermal
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