Functions
2.7 Monitoring Function
SIPROTEC, 7VK61, Manual
C53000-G1176-C159-3, Release date 05.2009
143
2.7.1.6
Setting Notes
General
The sensitivity of the measured value monitoring can be changed. Experiential values set ex works are ade-
quate in most cases. If particularly high operational asymmetries of the currents and/or voltages are expected,
or if one or more monitoring functions pick up sporadically during normal operation, the sensitivity setting(s)
should be reduced.
The measurement supervision can be switched
ON
or
OFF
in address
2901
MEASURE. SUPERV
.
Current balance supervision
Address
2902
BALANCE U-LIMIT
determines the limit voltage (phase-to-phase), above which the voltage
symmetry monitoring is effective. Address
2903
BAL. FACTOR U
is the associated balance factor, i.e. the
gradient of the balance characteristic. The indication
„Fail U balance“
(no. 167) can be delayed at address
2908
T BAL. U LIMIT
. These settings can only be changed using DIGSI at
Additional Settings
.
Address
2904
BALANCE I LIMIT
determines the limit current above which the current symmetry monitoring
is effective. Address
2905
BAL. FACTOR I
is the associated balance factor, i.e. the gradient of the balance
characteristic. The indication
„Fail I balance“
(no. 163) can be delayed at address
2909
T BAL. I
LIMIT
. These settings can only be changed using DIGSI at
Additional Settings
.
Summated current supervision
Address
2906
Σ
I THRESHOLD
determines the limit current above which the current sum monitoring is activat-
ed (absolute portion, only relative to
I
N
). The relative portion (relative to the maximum phase current) for acti-
vating the current sum monitoring is set at address
2907
Σ
I FACTOR
. These settings can only be changed
using DIGSI at
Additional Settings
.
Note
Current sum monitoring can operate properly only when the residual current of the protected line is fed to the
fourth current input (
I
4
) of the relay.
Asymmetrical measuring voltage failure "Fuse Failure Monitor"
The settings of the „Fuse Failure Monitor“ for asymmetrical measured voltage failure must be selected so that
on the one hand reliable pickup of the monitoring is ensured in the case of loss of a phase voltage (address
2911
FFM U>(min)
), while on the other hand a pickup due to earth faults in an earthed system is avoided. In
accordance with this requirement, address
2912
FFM I< (max)
must be set sufficiently sensitive (below the
smallest fault current due to earth faults). These settings can only be changed using DIGSI at
Additional Set-
tings
.
In address
2910
FUSE FAIL MON.
, the „Fuse Failure Monitor“, e.g. during asymmetrical testing, can be
switched
OFF
.
Measured voltage failure monitoring
In address
2915
V-Supervision
, the measured voltage supervision can be switched to
w/ CURR.SUP
,
w/
I> & CBaux
or
OFF
. Address
2916
T V-Supervision
is used to set the waiting time of the voltage failure
supervision. This setting can only be changed in DIGSI at
Display Additional Settings
.
Summary of Contents for Siprotec 7VK61
Page 8: ...Preface SIPROTEC 7VK61 Manual C53000 G1176 C159 3 Release date 05 2009 8 ...
Page 14: ...Contents SIPROTEC 7VK61 Manual C53000 G1176 C159 3 Release date 05 2009 14 ...
Page 316: ...Literature SIPROTEC 7VK61 Manual C53000 G1176 C159 3 Release date 05 2009 316 ...
Page 328: ...Glossary SIPROTEC 7VK61 Manual C53000 G1176 C159 3 Release date 05 2009 328 ...