1MRS 751108-MUM
REX 521
21
Protection Relay
Technical Reference Manual, General
Values to be set for a current sensor (Rogowski coil):
• secondary rated voltage of the current sensor used at the preset primary rated
current (100...300 mV)
• primary rated current of the current sensor used (1...6000 A)
• amplitude correction factor of the current sensor used at rated current
(0.9000...1.1000)
• correction parameter for the phase displacement error of the current sensor
(-1.0000°...1.0000°)
Values to be set for a voltage divider:
• division ratio of the voltage divider primary and secondary voltage (100...20000)
• rated value of primary phase-to-phase voltage (0.100...440.000 kV)
• amplitude correction factor of the voltage divider (0.9000...1.1000)
• correction parameter for the phase displacement error of the voltage divider
(-1.0000°...1.0000°)
Calculation of correction parameters and factors:
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:
Voltage transformers:
Rogowski coil:
Amplitude error at current I
n
(p = error in per cent)
Amplitude correction factor 1
= 1 / (1+ p/100)
Amplitude error at current 0.01 x I
n
(p = error in per cent)
Amplitude correction factor 2
= 1 / (1+ p/100)
Phase displacement error at current I
n
(d = error in degrees)
Phase displacement error 1 = - d
Phase displacement error at current 0.01 x I
n
(d = error in degrees)
Phase displacement error 2 = - d
Amplitude error at voltage U
n
(p = error in per cent)
Amplitude correction factor
= 1 / (1+ p/100)
Phase displacement error at voltage U
n
(d = error in degrees)
Phase displacement error = - d
Amplitude error at the whole measuring range
(e = error in per cent)
Amplitude correction factor
= 1/(1+ e/100)
Phase displacement error at the whole
measuring range
(e = error in degrees)
Phase displacement error = - e
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