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.
Specifications and Performance
- Rated primary voltage: 40.5 – 252 kV
- Rated primary current: >2500 A to 5000 A (up to 8000 A under specific conditions – please contact us)
- Rated secondary current: 5A, 1A
- Rated output 10-50VA
- Metering accuracy class: 0.2S, 0.2, 0.5S and 0.5 class
- Accuracy limit factor 5, 10, 15, 20, 30, 40
- Protection accuracy class: 5P, 10P and TPY (additional classes on demand)
- Secondary cores: 1-8
LRGBJ Series Current Transformers
|Accuracy Class||0.2S, 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)|
|+45 ° C (113 ° F) to –50 ° C (-58 ° F)|
|252 kV rated: 460/1050/1200
126 kV rated: 230/550/630
|Level Partial Discharge||<5 pC|
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”
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:
|Rated transformation ratio|
|Number of secondary windings|
|Accuracy limit factor|
|Instrument security factor|
(Altitude, Pollution Class)
If users have specific requirements, custom designs are available upon request.
|LRGBJ - ZHD - 252 / 6000||252||5000~6000||2950||1520||855||3200||650/1433|
|LRGBJ - ZHD - 126 / 6000||126||5000~6000||1900||750||385||6300||1200/2646|
|LRGBJ - ZHD - 72 / 6000||72||5000~6000||1550||750||385||1925||400/882|
|LRGBJ - ZHD - 40.5 / 6000||40.5||5000~6000||1150||750||385||1015||200/441|
To view our brochure, click here.