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6.9.7.2
Unsymmetrical current detection
Unsymmetrical current indicated if:
•
any phase current is lower than
CurrUnsymPU
of the highest current in the three
phases.
•
the highest phase current is greater than
CurrRelPU
of
IBase
.
If these conditions are true, an unsymmetrical condition is detected. This detection is
enabled to generate a trip after a set time delay
tTrip
if the detection occurs in the next 200
ms after the circuit breaker has received a command to open trip or close and if the
unbalance persists. The 200 ms limitation is for avoiding unwanted operation during
unsymmetrical load conditions.
The pole discrepancy protection is informed that a trip or close command has been given
to the circuit breaker through the inputs CLOSECMD (for closing command information)
and OPENCMD (for opening command information). These inputs can be connected to
terminal binary inputs if the information are generated from the field (that is from
auxiliary contacts of the close and open push buttons) or may be software connected to the
outputs of other integrated functions (that is close command from a control function or a
general trip from integrated protections).
6.9.8
Technical data
Table 84:
CCRPLD (52PD) technical data
Function
Range or value
Accuracy
Operate value, current
asymmetry level
(0-100) %
± 1.0% of I
n
Reset ratio
>95%
-
Time delay
(0.000-60.000) s
± 0.5% ± 25 ms
6.10
Broken conductor check BRCPTOC (46)
6.10.1
Identification
Function description
IEC 61850
identification
IEC 60617
identification
ANSI/IEEE C37.2
device number
Broken conductor check
BRCPTOC
-
46
1MRK 511 287-UUS A
Section 6
Current protection
149
Technical manual
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