EXTENDED RANGE CURRENT TRANSFORMERS

Energycontrols


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The series 24 Extended Range CT's are specified and used by almost all Utilities in Australia.These CT's come with NATA certified Test Reports and have individual Serial Numbers for traceability.

AS 60044.1 specify limits of current error and phase displacement for special application extended range current transformers which have been designed to match the load range capacity of long range kWh meters. The usual EDMI Mk10A/Mk6E/Mk11 current transformer operated meter is rated at 4/20 amps and, for example, if operated by a Type ‘S’ 200/5 current transformer will accurately register a current loading up to 400 amps.

In accordance with AS 60044.1, special application extended range current transformers are designated by class accuracy followed by the letter ‘S’ and rated extended primary current 120% or 150% or 200%. For types ‘S’, ‘T’ and ‘W’ their class accuracy is therefore shown as ‘0.2S’ or ‘0.5S’ and extended range primary current is up to 200%.

In addition to reducing the stock-holding of CTs there is also a major advantage that CT ratio changes are reduced or eliminated. It is recognised that ratio changes, coupled with the associated change in the meter multiplier (or register) and the amended accounting procedure are a major cause of errors in levying charges.

The cost of a CT/CT ratio change can be significant, and even for a small electricity authority can amount to some hundreds of dollars.

These three ratios of CT can cover everything from 2 amps to 3000 Amps!

Extended range CTs have also proven to be of particular benefit in seasonal industries, e.g. milling, where there is a wide variation between minimum and peak activity.

Graphical Comparison

Showing ranges of accuracy of:

  1. Conventional CTs
  2. WF Energy Controls Extended Range CTs
Extended Range Current Transformers - Loading Graph

 

Material & Construction

Encapsulation Epoxy Resin 
Outer Case  Fibreglass filled Epoxy Resin or PVC 
Terminal Cover  Clear Polycarbonate 
Sealing Screws  Brass, Nickel plated 
Terminals  6mm Brass, Silver plated with silver plated nuts and stainless steel spring washers, or brass tunnel type 
Mounting Brackets Anodised Aluminium or Zinc plated steel

 

TYPE S: 200/5

Specifications

CURRENT RATIO 200/5A
ACCURACY CLASS 0.2S & 0.5S
BURDEN/VA 0.2 OHM/5 VA
EXTENDED PRIMARY CURRENT 200%
RANGE OF LOADING 2 A TO 400 A
THERMAL LIMIT CURRENT 200%
SHORT TIME CURRENT 40 kA/0.5 SECOND
FREQUENCY 50/60 HZ
INSULATION LEVEL 3 kV
SYSTEM VOLTAGE 0.72 kV
Extended Range - Current Transformer - Type S - Dimensions

TYPE T: 800/5

Specifications

CURRENT RATIO 800/5A
ACCURACY CLASS 0.2S & 0.5S
BURDEN/VA 0.6 OHM/15 VA
EXTENDED PRIMARY CURRENT 200%
RANGE OF LOADING 8 A TO 1600 A
THERMAL LIMIT CURRENT 200%
SHORT TIME CURRENT 40 kA/0.5 SECOND
FREQUENCY 50/60 HZ
INSULATION LEVEL 3 kV
SYSTEM VOLTAGE 0.72 kV
Extended Range - Current Transformer - Type T - Dimensions

 

TYPE W: 1500/5

Specifications

CURRENT RATIO 1500/5A
ACCURACY CLASS 0.2S & 0.5S
BURDEN/VA 0.6 OHM/15 VA
EXTENDED PRIMARY CURRENT 200%
RANGE OF LOADING 15 A TO 3000 A
THERMAL LIMIT CURRENT 200%
SHORT TIME CURRENT 40 kA/0.5 SECOND
FREQUENCY 50/60 HZ
INSULATION LEVEL 3 kV
SYSTEM VOLTAGE 0.72 kV
Extended Range - Current Transformer - Type W - Dimensions

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