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Innovative High Reliability High Voltage Equipment for the Power Grid

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LRGBJ – ZHD Series for High Currents

LRGBJ - ZHD Series Current Transformers
40.5 to 252 kV
5 to 5000 A (8000 A on specific configurations)

Dealing with very high currents involves a slightly different approach. The LRGBJ-ZHD Current Transformer's design has been further developed to process routine currents as high as 5000 A.  On specific configurations this design can accommodate 8000 A

The ZHD series is actually a "2-CT-in-one" design. The top of the device is accepting the high current line, providing a transformation ratio of K1. The bottom of the product is a high voltage CT with a transformation ratio of K2 using the secondary current generated through K1. The final ratio of this Current Transformer is then K=K1*K2

This unique design allows a remarkable flexibility in dealing with very high currents.

pic-013

Specifications and Performance

  1. Rated primary voltage: 40.5 - 252 kV
  2. Rated primary current: >2500 A to 5000 A (up to 8000 A under specific conditions - please contact us)
  3. Rated secondary current: 5A, 1A
  4. Rated output 10-50VA
  5. Metering accuracy class: 0.2S, 0.2, 0.5S and 0.5 class
  6. Accuracy limit factor 5, 10, 15, 20, 30, 40
  7. Protection accuracy class: 5P, 10P and TPY (additional classes on demand)
  8. Secondary cores: 1-8

LRGBJ Series Current Transformers

Accuracy Class0.2S, 0.2, 0.5S, 0.5 or 5P, 10P, TPY (for other classes, please contact us)
Rated Current> 2500 A to 5000 A (up to 8000 A under specific conditions)
Ambient
Temperature
+45 ° C (113 ° F) to –50 ° C (-58 ° F)
Insulation Level
(kV)
252 kV rated: 460/1050/1200
126 kV rated: 230/550/630
Level Partial Discharge<5 pC

Standards

All products comply with IEC-61869-2 "Current Transformers" and IEEE C57.13 standards Protective class current transformers comply with IEC-44-6:"Requirements for Protective Current Transformers for Transient Performance"

Maintenance

No maintenance is needed on our Current Transformers

Option: A simple monitoring feature of tanδ is proposed as an option for yearly monitoring of equipment.

Reminder: for electrical safety reasons, secondary circuits should not be opened during operation of any Current Transformer.

Inquiry Check List

When placing an order, customer's specification needs to include:

Reference Standard
Rated voltage
Rated current
Rated frequency
Rated transformation ratio
Number of secondary windings
Rated output
Accuracy class(es)
Accuracy limit factor
Instrument security factor
Environmental Conditions
(Altitude, Pollution Class)

If users have specific requirements, custom designs are available upon request.

Dimensions
LRGBJ-ZHD Series

Model ReferenceRated
Voltage (kV)
Rated Current
(A)
L
(mm)
W
(mm)
D
(mm)
Creepage
Distance
(mm)
Weight
(kg/lb)
LRGBJ - ZHD - 252 / 60002525000~6000295015208553200650/1433
LRGBJ - ZHD - 126 / 60001265000~6000190075038563001200/2646
LRGBJ - ZHD - 72 / 6000725000~600015507503851925400/882
LRGBJ - ZHD - 40.5 / 600040.55000~600011507503851015200/441

More Information

To view our brochure, click here.

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