Technical Data
4.20 Additional Functions
SIPROTEC, 7SK80, Manual
E50417-G1140-C344-A4, Release date 08.2010
392
Fuse Failure Monitor
Broken-wire Monitoring of Voltage Transformer Circuits
Local Measured Value Monitoring
Fault Event Recording
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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