Voltage Phase Sequence
If measured voltages are connected to the device and these are used, the voltage phase rotation is supervised.
On clockwise phase rotation this is done by supervising the phase sequence of the voltages
U
L1
before U
L2
before U
L3
.
This check is done as long as the voltages have a magnitude of at least
|
U
L1
|, |U
L2
|, |U
L3
| > 40 V/√3
Wrong phase rotation is indicated by the alarm
Fail Ph. Seq. U
(No 176) .
Setting Notes
Measured Value Monitoring
The sensitivity of the measured value monitoring can be changed. Default values are set at the factory, which
are sufficient in most cases. If especially high operating asymmetry in the currents and/or voltages is to be
expected for the application, or if it becomes apparent during operation that certain monitoring functions acti-
vate sporadically, then the setting should be less sensitive.
The current symmetry supervision can be switched ON or OFF in address 8101 BALANCE I, the voltage super-
vision (if available) in address 8102 BALANCE U.
The current phase sequence can be switched ON or OFF in address 8105 PHASE ROTAT. I; the voltage
sequence monitoring (if available) in address 8106 PHASE ROTAT. U.
In address 8104 SUMMATION U the voltage sum monitoring ON or OFF can be set (if available).
Address 8111 BAL. I LIMIT M1 determines the threshold current for measuring location 1 above which
the current balance supervision is effective. Address 8112 BAL. FACT. I M1 is the associated symmetry
factor; that is, the slope of the symmetry characteristic curve. In order to avoid activation during short-term
asymmetries, the monitoring is delayed at address 8113 T Sym. I th. M1. This parameter can only be set
with DIGSI under Additional Settings. The time delay usually amounts to a few seconds.
The same considerations apply for the further measuring locations, as far as they are available and allocated:
Address 8121 BAL. I LIMIT M2, 8122 BAL. FACT. I M2 and 8123 T Sym. I th. M2 for measuring
location 2,
Address 8131 BAL. I LIMIT M3, 8132 BAL. FACT. I M3 and 8133 T Sym. I th. M3 for measuring
location 3,
Address 8141 BAL. I LIMIT M4, 8142 BAL. FACT. I M4 and 8143 T Sym. I th. M4 for measuring
location 4,
Address 8151 BAL. I LIMIT M5, 8152 BAL. FACT. I M5 and 8153 T Sym. I th. M5 for measuring
location 5.
Address 8161 BALANCE U-LIMIT determines the threshold voltage above which the voltage balance super-
vision is effective. Address 8162 BAL. FACTOR U is the associated symmetry factor, i.e. the slope of the
symmetry characteristic curve (if voltages available). In order to avoid activation during short-term asymme-
tries, the monitoring is delayed at address 8163 T BAL. U LIMIT. This parameter can only be set with DIGSI
under Additional Settings. The time delay usually amounts to a few seconds.
Settings
Addresses which have an appended “A” can only be changed with DIGSI, under “Additional Settings”.
The table indicates region-specific presettings. Column C (configuration) indicates the corresponding secon-
dary nominal current of the current transformer.
Addr.
Parameter C Setting Options Default Setting Comments
8101 BALANCE I ON
OFF
OFF Current Balance Supervi-
sion
8102 BALANCE U ON
OFF
OFF Voltage Balance Supervi-
sion
8104 SUMMATION U ON
OFF
OFF Voltage Summation Super-
vision
2.19.1.4
2.19.1.5
Functions
2.19 Monitoring Functions
SIPROTEC 4, 7UT6x, Manual 257
C53000-G1176-C230-5, Edition 09.2016
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