x/EN TD/Na7
-10 MiCOM P74
Current transformer and feeder
characteristics
Class: 5P (IEC185)
X (BS3958)
TPX (IEC 44-6)
TPY (IEC 44-6)
TPZ (IEC 44-6)
Min. Knee point voltage (BS 3958):
Vk: 100/I
n
V…5k/I
n
V (step 10/I
n
V)
Rated Burden (IEC 44-6):
S: 5VA…100VA (step 1VA)
Rated Resistive Burden (IEC 44-6):
5…100/I
n
2
Ω (step 1/I
n
2
Ω)
rRB: data calculated from rated burden
Rated short-circuit current factor:
Kscc: 10…50 (step 5)
Secondary resistance (Ω)
R
CT
: 0.1…50.0 Ω (step 0.1Ω)
External loop resistance Eff. Burden (Ω):
RB: 0.1…200.0/ I
n
2
Ω (step 1/ I
n
2
Ω)
External loop resistance Eff. Burden VA
(Data calculated from Eff. Burden Ohm)
Blocking of 87BB on phase-phase feeder fault
for external ph-ph fault detection - (>1.5 max
ph-ph fault current infeed) with Ultra high
speed detection <1 ms:
I>BB: 0.05…4×I
n
(step 0.01×I
n
)
Blocking of 87BB on earth/feeder fault
(external earth fault detection) - (>1.5 max
earth fault current infeed. Ultra high speed
detection required <1 ms):
IN>BB: 0.05…4×I
n
(step 0.01×I
n
)
Supervision of I0 calculation
Kce: 0.01…1.00 (step 0.01)
I0 error alarm time delay
Tce: 0.0…10.0s (step 0.1s)
I0 supervision blocking : 87BB (P&N) / None
CTS Timer alarm : 0.1s…10.0s (step 0.1s)
Note: I
n
is the CT nominal current
Dead Zone protection (PU)
Phase threshold
I>DZ: 0.05…4.00×I
n
(step 0.01×I
n
)
Time delay: 0.00…100.00s (step 10ms)
Dead Zone Earth: Disabled/Enabled
Neutral threshold:
IN>DZ: 0.05…4.00×I
n
(step 0.01×I
n
)
Time delay: 0.00…100.00 s (step 10ms)
Note: I
n
is the CT nominal current
Breaker failure protection (PU)
Caution: the following current set values are
expressed in multiple of the local CT’s nominal
rated current Inp (primary) or Ins (secondary).
Breaker Failure
1
st
phase O/C threshold
(dead pole detection for 50BF):
I<: 0.05…4.00×I
n
(step 0.01×I
n
)
Confirmation I>: Disabled/Enabled
2
nd
phase O/C threshold:
I>: 0.05…4.00×I
n
(step 0.01×I
n
)
Confirmation IN>: Disabled/Enabled
2
nd
residual O/C threshold:
IN>: 0.05…4.00×I
n
(step 0.01×I
n
)
Timers for 50BF internal tripping
CB fail 1 timer:
tBF1: 0.00…10.00s (step 10ms)
CB fail 2 timer:
tBF2: 0.00…10.00s (step 10ms)
Timers for 50BF external tripping
(orders from 21 or 87T etc.)
CB fail 3 timer:
TBF3: 0.00…10.00 s (step 10ms)
CB fail 4 timer:
TBF4: 0.00…10.00 s (step 10ms)
Overcurrent Protection (PU)
Phase Fault Protection (50/51)
3 phase Overcurrent Function Status I>1:
0. Disabled
1. DT
2. IEC S Inverse
3. IEC V Inverse
4. IEC E Inverse
5. UK LT Inverse
6. IEEE M Inverse
7. IEEE V Inverse
8. IEEE E Inverse
9. US Inverse
10. US ST Inverse
If “function status” ≠0
I>1 Current Set: 0.10…32.00×In
(step 0.01×In)
If “function status” =1
I>1 Time delay: 0.00…100.00s (step 10ms)
If ”function status” ≤5
I>1: 0.025…1.200 (step 0.025)
If “function status” ≥6
I>1 time Dial: 0.5…15.0 (step 0.1)
I>1 Reset Char: DT or inverse
If ”function status” ≤5
or
“I>1 Reset Char.”=DT and “function status” ≥6
I>1: 0.0…100.0 (step 0.1)
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