Technical Data
4.22 Additional Functions
SIPROTEC, 7SK80, Manual
E50417-G1140-C344-A5, Release date 11.2012
410
Fuse Failure Monitor
Broken-wire Monitoring of Voltage Transformer Circuits
Local Measured Value Monitoring
Fault Logging
Time Allocation
Fault Recording
Setting range of the displacement voltage 3U0
above which voltage failure is detected
10 - 100 V
Setting range of the ground current above which no
voltage failure is assumed
0.1 - 1 A for I
Bdmd
= 1 A
0.5 - 5A for I
Bdmd
= 5A
Setting range of the pickup threshold I> above
which no voltage failure is assumed
0.1 - 35 A for I
Bdmd
= 1 A
0.5 - 175 A for I
Bdmd
= 5A
Measuring voltage monitoring depends on the MLFB and configuration with measured
and calculated values V
N
and I
N
suited for single-, two- or three-pole broken-wire detection of voltage transformer circuits;
only for connection of phase-Ground voltages
Current asymmetry I
max
/I
min
> symmetry factor, for I > I
limit
Voltage asymmetry V
max
/V
min
> symmetry factor, for V > V
limit
Current sum | i
A
+ i
B
+ i
C
+ k
I
· i
N
| > limit value, with
Current phase sequence Clockwise (ABC) / counter-clockwise (ACB)
Voltage phase sequence Clockwise (ABC) / counter-clockwise (ACB)
Recording of indications of the last 8 power system faults
Recording of indications of the last 3 power system ground faults
Resolution for Event Log (Operational Annuncia-
tions)
1 ms
Resolution for Trip Log (Fault Annunciations) 1 ms
Maximum Time Deviation (Internal Clock) 0.01 %
Battery Lithium battery 3 V/1 Ah, type CR 1/2 AA
Message „Battery Fault“ for insufficient battery charge
maximum of 8 fault records saved; memory maintained by buffer battery in the case of auxiliary voltage failure
Recording time 5 s per fault record, in total up to 18 s at 50 Hz
(max. 15 s at 60 Hz)
Intervals at 50 Hz
Intervals at 60 Hz
1 instantaneous value each per 1.0 ms
1 instantaneous value each per 0.83 ms
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