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1MAC050144-MB C
Section 6
Supervision functions
615 series ANSI
441
Technical Manual
Figure 234:
CCM operating characteristics
When the differential current I_DIFF is in the operating region, the
FAIL
output is
activated.
The function is internally blocked if any phase current is higher than the set
Max trip
current
. When the internal blocking activates, the
FAIL
output is deactivated
immediately. The internal blocking is used for avoiding false operation during a fault
situation when the current transformers are saturated due to high fault currents.
The value of the differential current is available through the Monitored data view on the
LHMI or through other communication tools. The value is calculated with the formula:
(Equation 54)
The
Pickup value
setting is given in units of xIn of the phase current transformer. The
possible difference in the phase and reference current transformer ratios is internally
compensated by scaling
I_REF
with the value derived from the
Primary current
setting
values. These setting parameters can be found in the Basic functions section.
The activation of the
BLOCK
input activates the
FAIL
output immediately.
Timer
The timer is activated with the
FAIL
signal. The
ALARM
output is activated after a fixed
200 ms delay.
FAIL
needs to be active during the delay.
When the internal blocking is activated, the
FAIL
output is deactivated immediately. The
ALARM
output is deactivated after a fixed 3 s delay, and the
FAIL
is deactivated.
I DIFF
I A I B I C
I REF
_
_
_
_
_
=
+
+
−
Summary of Contents for 615 Series ANSI
Page 1: ...Relion Protection and Control 615 series ANSI Technical Manual ...
Page 2: ......
Page 29: ...1MAC050144 MB C Section 615 series ANSI 22 Technical Manual ...
Page 389: ...Section 4 1MAC050144 MB C Protection functions 382 615 series ANSI Technical Manual ...
Page 485: ...Section 6 1MAC050144 MB C Supervision functions 478 615 series ANSI Technical Manual ...
Page 635: ...Section 10 1MAC050144 MB C Other functions 628 615 series ANSI Technical Manual ...
Page 711: ...Section 16 1MAC050144 MB C Glossary 704 615 series ANSI Technical Manual ...
Page 712: ......