Siemens SIPROTEC 4 7UT6 Series Manual page 87

Address 1115
Address 1121
Address 1122
Address 1123
Address 1124
Address 1125
NOTE
i
i
When setting the residual current parameters for the sides of three-phase protected objects, the following
order must be followed:
1. Determination of the ratio Ι
2. As a minimum setting for parameters 1111 to 1115, this results in a value of 0.04 Ι
Example:
I = 3000 A, I = 1128 A → Ι
P NS
PoleOpenCurr.S1 (Min.) = 0.04 · 2.66 = 0,11
If a value smaller than described under 2 is set (faulty configuration), this fact will be detected in a plausibility
check and reported, and the differential protection will be blocked.
If parasitic currents (e.g. through induction) can be excluded when the circuit breaker is open, these settings
may normally be very sensitive. Otherwise the settings must be increased correspondingly. In most cases the
setting can be the same for all addresses displayed.
However, note that current summation measuring errors may occur on the sides which are fed by multiple
measuring locations.
In the 1-phase busbar protection, you can set such an open-pole current for each of the up to 9 feeders
(7UT613 and 7UT633 for 1-phase connection with or without summation CT) or 12 feeders (7UT635 with or
without summation CT) of the busbar. The maximum range of possible addresses includes:
Address 1131
Address 1132
Address 1133
Address 1134
Address 1135
Address 1136
Address 1137
Address 1138
Address 1139
Address 1140
Address 1141
Address 1142
Finally, it is also possible to monitor the residual currents at the auxiliary measuring locations. These residual
currents are needed by the dynamic cold-load pickup feature of the earth overcurrent protection, if no side or
measuring location is assigned to the earth overcurrent protection. The maximum range of possible addresses
includes:
Address 1151
Address 1152
Address 1153
Address 1154
SIPROTEC 4, 7UT6x, Manual
C53000-G1176-C230-5, Edition 09.2016
PoleOpenCurr.S5 for side for side 1 of the main protected object, of
the main protected object,
PoleOpenCurr.M1 for measuring location 1,
PoleOpenCurr.M2 for measuring location 2,
PoleOpenCurr.M3 for measuring location 3,
PoleOpenCurr.M4 for measuring location 4,
PoleOpenCurr.M5 for measuring location 5.
(primary current of transformer) / Ι
P
/ Ι = 2.66
P NS
PoleOpenCurr I1 for feeder 1,
PoleOpenCurr I2 for feeder 2,
PoleOpenCurr I3 for feeder 3,
PoleOpenCurr I4 for feeder 4,
PoleOpenCurr I5 for feeder 5,
PoleOpenCurr I6 for feeder 6,
PoleOpenCurr I7 for feeder 7,
PoleOpenCurr I8 for feeder 8,
PoleOpenCurr I9 for feeder 9,
PoleOpenCurrI10 for feeder 10,
PoleOpenCurrI11 for feeder 11,
PoleOpenCurrI12 for feeder 12.
PoleOpenCurrIX1 for further measuring location 1,
PoleOpenCurrIX2 for further measuring location 2,
PoleOpenCurrIX3 for further measuring location 3,
PoleOpenCurrIX4 for further measuring location 4.
(rated current of the side)
Ns
/ Ι
P NS
Functions
2.1 General
87