Siemens 7SC80 Manual page 35

You can also set tripping characteristics at address 112 Charac. Phase and 113 Charac. Ground to All
Curves. Under this characteristic, overcurrent function would have four inverse elements, and these inverse
elements could be set to different tripping characteristics (IEC, ANSI or Recloser) without any restriction.
Set to Disabled, the entire time overcurrent protection is disabled.
The directional overcurrent protection is set at addresses 115 67/67-TOC and 116 67N/67N-TOC. Here, you
can select the same options as for non-directional overcurrent protection (except for the 67-3 element).
For (sensitive) ground fault detection address 130 S.Gnd.F.Dir.Ch lets you specify the directional charac-
teristic of the sensitive ground fault detection. You can select between cos φ / sin φ and V0/I0 φ mea.
as the measurement procedure. The cos φ / sin φ procedure (via residual watt-metric current detection)
is set by default.
At address 131 Sens. Gnd Fault, you can select between a definite time characteristic (Definite Time),
a User Defined PU, and the inverse time characteristics TOC IEC or TOC ANSI. When set to Disabled,
the entire function is disabled.
For unbalanced load protection, address 140 46 allows you to specify which tripping characteristics to use.
You can select between Definite Time, TOC ANSI or TOC IEC. If this function is not required, select
Disabled.
For overload protection, you can determine at address 142 49 whether the function operates with or without
ambient temperature (No ambient temp) or whether the entire function is Disabled.
The synchronization function is activated in address 161 25 Function 1 by the setting SYNCHROCHECK or it
is set to Disabled.
At address 376 Sectionalizer , you can select between With prot. (enabled with protection function)
and Without prot. (enabled without protection function). When set to Disabled, the entire function is
disabled.
At address 170 50BF, you can set the breaker failure protection to Enabled or Disabled. The setting option
enabled w/ 3I0> subjects the ground current and the negative sequence current to a plausibility check.
With the setting option Enabled w/o I>, only the circuit breaker auxiliary contacts are evaluated.
For the CB maintenance functions, several options are available under address 172 52 B.WEAR MONIT. Irre-
spective of this, the basic functionality of the summation-current formation (ΣΙ procedure) is always active. It
requires no further configurations and adds up the tripping currents of the trips initiated by the protection
functions.
When selecting the ΣI
value. The 2P Procedure continuously calculates the remaining lifespan of the circuit breaker.
With the Ι 2 t Procedure, the square fault current integrals are formed via arc time and output as a reference
value.
Further information concerning the individual procedures of the CB maintenance are given in Section
2.26.2 Statistics. You can also disable this function by setting it to Disabled.
At address 181 Fault Locatoryou can enter how many line sections (maximum of 3) are taken into
account by the fault locator.
Under address 182 74 Trip Ct Supv, you can be selected whether the trip-circuit supervision works with
two (2 Binary Inputs) or only one binary input (1 Binary Input), or whether the function is config-
ured Disabled.
At address 369 VT Con Type, you can specify the connection type of the voltage inputs. If you are using
normal voltage transformers, select CONVENTIONAL.
If you want to work with capacitive voltage measurement, select Cap. Volt.Meas.. In this case, you have
to specify the bushing capacitance as well as the line and stray capacitances for the capacitive voltage dividers
at the voltage inputs at addresses 241 to 248 (see Section
urement, the tolerance values for the individual protection functions indicated in the Technical Data.
If you select LoPo/LPS, you can connect the voltages via unconventional transformers, for example LPS (Line
Post Sensor).
The Appendix provides connection examples in Section
tional voltage connection also apply to the LoPo/LPS connection. A separate example is given for the capaci-
tive voltage connection.
At address 368 AssignMeasInput you can use the input Vx also as LoPo/LPS input. With the setting Ia,
Ib, Ic, Vx, any voltage can be connected to the Vx voltage input.
SIPROTEC Compact, 7SC80, Manual
E50417-G1140-C486-A8, Edition 07.2017
x -Procedure, the sum of all tripping current powers is formed and output as reference
2.1.3.2 Setting Notes). For capacitive voltage meas-
C Connection Examples. The examples of the conven-
Functions
2.1 General
35