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.
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) |
| 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 Reference | Rated Voltage (kV) |
Rated Current (A) |
L (mm) |
W (mm) |
D (mm) |
Creepage Distance (mm) |
Weight (kg/lb) |
| 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 |
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