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Encompass
Current Transformers (600V)
850 Feeder Protection System
Encompass™ Current Transformers from GE offer electrical utilities piece of mind knowing they’ll have the right CT in stock. Upgrade today and eliminate the need for multiple current ratios, thereby simplifying CT selection.
Application

Encompass wide range CTs are designed for commercial and industrial applications. Encompass CT’s substantially reduce inventory, complexity and improve standardization for meter shop operations, particularly when used with GE’s kV2c FITZALL™ transformer rated meters.

  • JCR-0W, 10A-1000A, 2” Window, Indoor/Outdoor
  • JAK-0W, 20A-2000A, 3” Window, Indoor/Outdoor
  • JAB-0W, 20A-3000A, 4.5” x 3.5” Window, specifically designed for secondary bushing of padmount transformers
  • JAD-0W, 40A-4500A, 5.75” Window, Indoor/Outdoor
Features
  • Meets IEEE C57.13 definition of 0.3 Standard Revenue Metering accuracy class, with additional extended range performance capability
  • The same ANSI mounting provisions, terminals, construction as standard CT’s
Benefits
  • Reduce inventory requirements
  • Reduce part numbers
  • Simplify CT selection
  • Simplify billing multipliers


Application Overview: Secondary Metering with Current Transformers

Encompass and RevenueSense CTs provide flexibility for commercial and industrial applications, indoor or outdoor service and bar-type or window-type configurations.

Redefining the Test Limits

Traditionally, CT accuracy is tested at:

  • 10% of rated current (light load)
  • 100% of rated current (full load)
  • With a rating factor between 1.0 and 4.0.
  • With GE Encompass CT’s, the 0.3 accuracy class is extended by changing the test points to:

    • 4% of rated current (light load)
    • 40% of rated current (full load)
    • With a typical rating factor of 4.0


Wide Range Designed for CL20 Meter

A rating factor of 4.0 means the Current Transformer meets rated accuracy at up to 4 times the rated primary current. Thus, the output on a 5 Amp CT secondary can be used up to 20 Amps if a rating factor of 4.0 is assigned to the CT (4.0*5A = 20A). This pairs the CT output range and the Meter input range when used with a CL20 transformer rated meter, maximizing the performance potential of the system.

Standard CT Test Limits



Encompass Test Limits



Results and Benefits

The 4% and 40% test points in combination with a high rating factor of 4.0 means 1 Encompass CT can equal or better the performance of both higher AND lower ratios.

The 500:5 Encompass unit when compared to a 200:5 standard CT has equal to or better test results at all points included even low currents and is available at an equivalent price. This comparison holds true across several other standard CT ratios, meaning one Encompass CT can functionally replace up to eight other standard ratios, allowing for an inventory reduction of up to nearly 90%.


Encompass CT vs. Standard CT

To demonstrate the advantages of upgrading to an Encompass CT,
let’s compare a JAK-0W 500:5 Encompass CT to a JAK-0C 200:5 standard CT

    Physically, the JAK-0W 500:5 Encompass CT:
  • Is lighter
  • Has the exact same mounting plate
  • Has the exact same terminal locations
  • Has the exact same window size
  • Electrically, the accuracy of a JAK-0W 500:5 is equivalent or better than the accuracy of a JAK-0C 200:5 across all test points. This can be looked at two ways:

    A 500:5 Encompass CT has ±0.3% accuracy from 200A to 2000A, compared to a standard 200:5 CT which has a ±0.3% accuracy from 200A to only 800A. Both CT’s have ±0.6% accuracy from 20A to 200A.

    The 500:5 Encompass CT has equal to or better accuracy rating across the entire 20A to 2000A range. It is important to note that accuracy class only defines the “tolerance of error” allowed in a CT. Actual test results are also an important factor when evaluating CT’s. At a typical burden of B-0.1, the Encompass CT test results slightly outperform a standard CT, even at the lowest test amps. All Encompass test results are well within the IEEE limits.


    * Tested Accuracy Class values shown are for illustrative purposes only, and not a guarantee of performance. Actual results may
    vary, within defined test tolerances.


Standard CT
Make & Model
Ratios Operating Range GE Encompass
Model
Ratio Operating Range
GE JCR-0C or JCW-0C
ABB CSF or CSH
Ritz DCCW
Itron R6M or R6SA
GEC Durham TCW or TFW
100:5, 200:5, 300:5, 400:5, 500:5 10A-1000A JCR-0W 250:5 10A-1000A
GE JAK-0C
ABB CMF
Ritz DCCW
Itron R6M
GEC Durham AB
200:5, 300:5, 400:5, 500:5, 600:5, 800:5, 1000:5, 1200:5, 2000:5 20A-2000A JAK-0W 500:5 20A-2000A
GE JAB-0C
ABB CMV
Ritz DCDW
Itron R6P
GEC Durham AP
200:5, 300:5, 300:5, 400:5, 500:5, 600:5, 1000:05 20A-2000A JAB-0W 500:5 20A-2000A
600:5, 800:5, 1000:5, 1200:5 60A-2400A JAB-0W 1500:5 60A-3000A
GE JAD-0C
ABB CLC
Ritz DCEW
Itron R6L
GEC Durham AD
2400:5, 500:5, 600:5, 800:5, 1000:5, 1200:5, 2000:5, 3000:5 40A-4000A JAD-0W 1000:5 40A-4000A
600:5, 800:5, 1000:5, 1200:5, 1500:5, 2000:5, 3000:5, 4000:5 60A-4500A JAD-0W 1500:5  
CT Models