Functions
2.1 General
SIPROTEC, 7SK80, Manual
E50417-G1140-C344-A4, Release date 08.2010
29
Special Features
Most settings are self-explaining. The special cases are described in the following.
If you want to use the setting group change function, set address 103 Grp Chge OPTION to Enabled. In this
case, you can select up to four different groups of function parameters between which you can switch quickly
and conveniently during operation. Only one setting group can be used when selecting the option Disabled.
For the elements associated with non-directional overcurrent protection 50(N), 51(N) (phase and ground),
various tripping characteristics can be selected at addresses 112 Charac. Phase and 113 Charac.
Ground. If only the definite time Curve is desired, select Definite Time. Alternatively, you can select
between inverse-time curves according to IEC standard (TOC IEC) or ANSI standard (TOC ANSI). The dropout
behavior of the IEC and ANSI curves is specified at address 1210 or 1310 when configuring the time overcur-
rent protection.
Set to Disabled to disable the entire time overcurrent protection.
The direction overcurrent protection Ground is set at 11667N/67N-TOC. Here, the same options are available
as for non-directional overcurrent protection (except the 50N-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 wattmetric current detection) is
set by default.
If cos ϕ / sin ϕ is configured as the measurement procedure, you can select between a definite time curve
(Definite Time) and a User Defined PU at address 131 Sens. Gnd Fault. The setting V0/I0 ϕ
mea.
provides the definite time characteristic Definite Time. 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 (With amb. temp. or No ambient temp) or whether the entire function is Disabled.
In address 170 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.
For the CB maintenance functions, several options are available under address 172 52 B.WEAR MONIT. Ir-
respective of this, the basic functionality of the summation current formation (ΣI procedure) is always active. It
requires no further configurations and adds up the tripping currents of the trips initiated by the protection func-
tions.
When selecting the ΣI
x
-Procedure, the sum of all tripping current powers is formed and output as reference
value. The 2P Procedure continuously calculates the remaining lifespan of the circuit breaker.
With the I
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 2.18.2.
You can also disable this function by setting it to Disabled.
Under address 182 74 Trip Ct Supv it 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 configured
Disabled.
If you set the function to Enabled in address 190 RTD INPUT, you can specify the number and the transmis-
sion type of the measuring points (RTD = Resistance Temperature Detector) in address 191 RTD
CONNECTION. When connecting an RTD box to serial port B, select 6 RTD simplex or 6 RTD HDX; for two
RTD boxes select 12 RTD HDX. When connecting an RTD box to port A, select 6 RTD Eth, for two RTD
boxes select 12 RTD Eth. If the connection is made via the I/O2 module, select the setting Int.Temp.Meas..
The Appendix provides some implementation examples in the section „Connection Examples“). The settings in
address have to comply with those at the RTD box (see Section 2.15.2, at „RTD Box Settings“).
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