ABB REX 521, Техническое справочное руководство, общее

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1MRS 751108-MUM Protection Relay
Technical Reference Manual, General
REX 521
15
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Primary values and measurement device settings
The conversion between primary and per unit values are based on the analogue
scales of the I
L1
(I
L1
pu-scale), I
0
(I
0
pu-scale), I
0b
(I
0b
pu-scale), U
12
(U
12
pu-scale)
and U
0
(U
0
pu-scale). To ensure proper operation, it must be checked that the
analogue scales of the phase currents I
L1
, I
L2
and I
L3
, and correspondingly, the
analogue scales of the phase-to-phase voltages U
12
, U
23
and U
31
are identical.
4.1.7. Digital inputs
The digital inputs of the protection relay are voltage-controlled and optically
isolated. For technical data of the digital inputs, refer to Table 4.2.1-3 on page 31.
4.1.7.1. Filtering of digital inputs
The filter time eliminates debounces and short disturbances on digital inputs. The
filter time may be set individually for each input.
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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
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