ABB RET 54 Series Technical Reference Manual, General page 40

RET 54_
40
Transformer Terminal
Technical Reference Manual, General
Values to be set for a current transformer:
• rated primary current (1...6000 A) of the primary current transformer
• rated secondary current (5 A, 2 A, 1 A, 0.2 A) of the primary current transformer
• rated current (5 A, 1 A, 0.2 A) of the current measuring input (= rated current of
the matching transformer of the transformer terminal)
• amplitude correction factor (0.9000...1.1000) of the primary current transformer
at rated current
• correction parameter for the phase displacement error of the primary current
transformer at rated current (-5.00°...0.00°)
• amplitude correction factor of the primary current transformer at a signal level of
1% of the rated current (0.9000...1.1000)
• correction parameter for the phase displacement error of the primary current
transformer at a signal level of 1% of the rated current (-10.00°...0.00°)
Values to be set for a voltage transformer:
• rated voltage of voltage input (same as the secondary rated voltage of the primary
voltage transformer connected to the voltage input, 100 V, 110 V, 115 V, 120 V)
• rated voltage of primary voltage transformer (0.100...440.000 kV)
• amplitude correction factor of the primary voltage transformer voltage at rated
voltage (0.9000...1.1000)
• correction parameter for the primary transformer phase displacement error at
rated voltage (-2.00°... 2.00°)
The measurement values stated by the manufacturer of the measuring device are
used for calculating the correction parameters and factors according to the following
formulas:
Current transformers
Amplitude error at current I
(e = error in per cent)
Amplitude error at current 0.01 x I
(e = error in per cent)
Phase displacement error at current I
(e = error in degrees)
Phase displacement error at current 0.01 x I
(e = error in degrees)
Voltage transformers
Amplitude error at voltage U
(e = error in per cent)
Phase displacement error at voltage U
(e = error in degrees)
Amplitude correction factor 1
n
= 1 / (1+ e/100)
Amplitude correction factor 2
n
= 1 / (1+ e/100)
Phase displacement error 1 = - e
n
Phase displacement error 2 = - e
n
Amplitude correction factor
n
= 1 / (1+ e/100)
Phase displacement error = - e
n
1MRS755225