ABB REM 545 - Page 46

46
1MRS750915-MUM
Machine Terminal
Technical Reference Manual, General
REM 54_
Values to be set for a voltage divider are:
• 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°)
1
Values to be set for general measurement:
2
• amplitude correction factor of general measurement
(-10000.00000...10000.00000)
• correction parameter for the offset correction of general measurement
(-10000.00000...10000.00000)
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
Voltage divider
1. Only included in Release 2.0 or later, refer to section “Revision identification” on
page 97. Note that this parameter can only be set via the HMI or the Relay Setting
Tool.
2. Only included in Release 2.0 or later, refer to section “Revision identification” on
page 97.
Amplitude error at current I
n
(e = error in per cent)
Amplitude correction factor 1
= 1 / (1+ e/100)
Amplitude error at current 0.01 x I
n
(e = error in per cent)
Amplitude correction factor 2
= 1 / (1+ e/100)
Phase displacement error at current I
n
(e = error in degrees)
Phase displacement error 1 = - e
Phase displacement error at current 0.01 x I
n
(e = error in degrees)
Phase displacement error 2 = - e
Amplitude error at voltage U
n
(e = error in per cent)
Amplitude correction factor
= 1 / (1+ e/100)
Phase displacement error at voltage U
n
(e = error in degrees)
Phase displacement error = - e
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
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