ABB REX 521, Technical Reference Manual, General

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1MRS 751108-MUM Protection Relay
Technical Reference Manual, General
REX 521
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• rated voltage of primary voltage transformer (0...440 kV)
• 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)
• 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°)
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• secondary rated voltage of the current sensor used at the preset primary rated
current (0...300 mV)
• primary rated current of the current sensor used (0...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°)
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• division ratio of the voltage divider primary and secondary voltage (0...20000)
• rated value of primary phase-to-phase voltage (0...440 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°)
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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:
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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)