High voltage Current Transformer (CT)
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
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  • PRODUCT DETAILS

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
class

± Percentage cur rent (ratio) error at
percentage of rated current shown below

± 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

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