
Main technical parameters
-
Rated voltage: 115kV
Highest voltage for equipment : 145kV
Rated primary current: 600-800-1200-2000A
Rated secondary current: lA
Rated transformation current:
Core 1, Core 2, Core 3, Core 4, Core5 600-800-1200-2000/lA
Rated Frequency: 50/60Hz
Polarity: Negative
Accuracy class: 5P20/0.2/0.2/5P20/5P20 Rated output: 30/30/30/30/30VA
Current error and phase displacement limit
Measuring windings:The current error and phase displacement at rated frequency shall not exceed the limit values given according to the corresponding items of the standard IEC 60044-1 :2003, when the secondary burden is any value form 25% to 100% of the rated burden. (Notes:The secondary burden used for test purpose shall have a power -factor of 0.8 lagging) (Details in the following sheet)
Accuracy |
± Percentage cur rent (ratio) error at |
± Phase displacement at percentage of rated current shown below |
||||||||
|
± (%) |
±(’ ) |
||||||||
|
1 |
5 |
20 |
100 |
120 |
1 |
5 |
20 |
100 |
120 |
0.2 |
⁄ |
0.75 |
0.35 |
0.2 |
0.2 |
⁄ |
30 |
15 |
10 |
10 |
-
Protective windings: At rated frequency and with rated burden connected, the current error, phase displacement and composite error shall not exceed the limit values given according to the corresponding items of the standard IEC 60044-1:2003. (Notes: the secondary burden used for test purpose shall have a power-factor of 0.8 lagging) (Details in the following sheet)
-
Instrument security factor for metering cores: Fs≤10
Accuracy limit factor for metering cores: 20
Limits of Temperature rise
Accuracy class |
Current error at rated primary current |
Phase displacement at rated primary current |
Composite error at rated accuracy limit primary current |
|
±(%) |
±(') |
±(%) |
5P |
1 |
60 |
5 |
The temperature rise of the current transformer when operating for a long term under rated primary current and rated output, shall not exceed the limiting value shown in the following.
a. Temperature rise of the windings: 65K
b. Temperature rise of the top layer of oil: 55K
c. Temperature rise of exterior terminal (P1,P2) or interface of the windings: 50K.
Installation dimensions




