and in series with one NC contact for each phase connected in parallel) and, after a settable time
interval
tTrip
(0-60 s), a 150 ms trip pulse command TRIP is generated by the Polediscrepancy
function (52PD).
8.10.7.2 Unsymmetrical current detection
M13946-21 v4
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 and the internal signal INPS is
turned high. 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).
8.10.8 Technical data
M13279-1 v9
Table 275: CCPDSC (52PD) technical data
Function Range or value Accuracy
Trip current (0–100)% of
IBase
±1.0% of I
n
Independent time delay
between trip condition and
trip signal
(0.000-60.000) s ±0.2% or ± 25 ms whichever is greater
8.11 Directional underpower protection GUPPDUP (37)
SEMOD156693-1 v4
8.11.1 Identification
SEMOD158941-2 v4
Function description
IEC 61850
identification
IEC 60617
identification
ANSI/IEEE C37.2
device number
Directional underpower protection GUPPDUP
SYMBOL-LL V2 EN-US
37
Section 8 1MRK 502 066-UUS B
Current protection
542
Technical manual
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