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Combined current/voltage transformer type KXM

Outdoor, oil-filled, substation class wide range, high accuracy wound type single phase metering unit

KXM outdoor rated substation class oil-filled current/voltage transformers are wound type single phase metering transformers intended for high accuracy revenue metering. These current/voltage transformers are built-to-order to customer specifications. KXM transformers can meet most revenue metering applications due to the special wide range capability of the design with up to four independent cores from 46 kV up to 245 kV. This combined housing is available with ANSI 70 gray porcelain insulator considered as the standard product, with silicone rubber (SIR) polymer as an option. Hermetic sealing of the design is accomplished using a fatigue resistant stainless steel bellows on the dome to prevent free-breathing outside moisture-ladened air.

The KXM 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
  • Tie-point metering for bi-directional power flow measurement

Why Hitachi ABB Power Grids?

For revenue metering on critical loads, this conservative oil-paper insulated current/voltage transformer is extremely reliable for this application with the same reliability service record as the separate current and voltage transformers. 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. ABB 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
  • 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

KXM  
Installation Outdoor
Design Wound type (top core CT and line to ground connected inductive VT)
Insulation Oil-paper
Highest voltage for equipment 46 - 245 kV
Maximum primary current Up to 4,000 A & up to 2,000/1200:1 VT ratios
Short-circuit current Up to 120 kA/1 sec & VF=1.9x-8Hrs
Insulators Porcelain (silicone rubber SIR optional)
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
Accuracy  
  •  CT
Meets all IEEE wide range high accuracy metering class 0.15s  

IEC CI 0.2s on request  

(0.15s stable from 0.5% to 400% nominal current  - 4000A maximum)
  •  VT
Meets IEEE 0.15%Z and 3000VA thermal
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