be issued by the IED after the trip decision is made with the added delay time form the
hardware and communication.
Figure
shows charging current compensation when the exact method is used (
CCCOpMode
=
U based). The charging current is subtracted from all three phases.
TOTAL COMPENSATED CURRENT I N PHASE L1
37 A subt racted under
fault condit ions
92 A subt racted from t he fundament al
frequency differential current
37 A subt racted
92 A subt racted
fault
fault
fault
37 A subt racted
92 A subt racted
CCC starts
af ter 100 ms
TOTAL COMPENSATED CURRENT I N PHASE L2
TOTAL COMPENSATED CURRENT I N PHASE L3
Time in seconds
IEC15000466-1-en.vsd
IEC15000466 V1 EN-US
Figure 42: Charging current compensation using the exact method
Charging current compensation starts 100 ms after simulation start when the power line was
switched on to normal load. Under normal load conditions, approximately 92 A is subtracted,
which results in all fundamental frequency differential currents being close to zero. Under fault
conditions with very low voltage at the fault and decreased voltages at both ends, the
charging current is smaller, and only 37 A is subtracted from the differential currents.
Figure
shows charging current compensation when the approximate method is used
(
CCCOpMode = IDiff reduction). The charging current is subtracted from all three phases.
IEC15000467-1-en.vsd
fault
fault
fault
TOTAL COMPENSATED CURRENT I N PHASE L1
TOTAL COMPENSATED CURRENT I N PHASE L2
TOTAL COMPENSATED CURRENT I N PHASE L3
92 A subt racted
92 A subt racted
92 A subt racted
92 A subt racted
92 A subt racted from t he fundament al
frequency differential current
92 A subt racted under fault
conditions
Time in seconds
CCC compensated
in app. 100 ms
IEC15000467 V1 EN-US
Figure 43: Charging current compensation using the approximate method
Charging current compensation is achieved 100 ms after simulation start when the power line
was switched on to normal load. Under normal load conditions, approximately 92 A is
subtracted, which results in all fundamental frequency differential currents being close to zero.
Since voltage profiles are not known, the approximate method continues, even under fault
conditions, to subtract the pre-fault charging current of 92 A.
1MRK 505 382-UEN E
Section 4
Analog and binary signal transfer for line differential protection
Communication set-up, 670/650 series
43
Application Guide
© Copyright 2017 ABB. All rights reserved
Summary of Contents for Relion 670 series
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