Siemens SIPROTEC 7SJ61, Manual, Page: 29 / 454

Functions
2.1 General
SIPROTEC, 7SJ61, Manual
C53000-G1140-C210-1, Release date 02.2008 29
2.1.1.2 Setting Notes
Setting the Functional Scope
Configuration settings can be entered using a PC and the software program DIGSI and transferred via the front
serial port or the rear service interface of the device. The operation via DIGSI is explained in the SIPROTEC 4
System Description.
For changing configuration parameters in the device, password no.7 is required (for parameter set). Without
the password, the settings can be read but not modified and transmitted to the device.
The functional scope with the available options is set in the Functional Scope dialog box to match plant re-
quirements.
Special Features
Most settings are self-explanatory. The special features are described below.
If you want to use the setting group change function, set address
103 Grp Chge OPTION
to
Enabled
. Simple
and fast changeover between up to four different setting groups is possible in service. Only one setting group
can be selected and used if this option is
Disabled
.
For the overcurrent elements of the time overcurrent protection (separately for phase currents and ground cur-
rent), various tripping characteristics can be selected at address
112 Charac. Phase
and
113 Charac.
Ground
. If only the definite characteristic is desired, then
Definite Time
should be selected. Additionally,
depending on the version ordered, various inverse time characteristics, based on either IEC (
TOC IEC
) stan-
dards or ANSI (
TOC ANSI
standards), or user-defined characteristic are available for selection. The dropout
behaviour of the IEC and ANSI characteristics will be specified later with settings (addresses
1210
and
1310
).
But for the user-defined characteristic, you can choose in address
112
and
113
whether to specify only the
pickup characteristic (
User Defined PU
) or the pickup and the dropout characteristic (
User def. Reset
).
Additionally, the superimposed high-current elements 50-2 and 50-3 are available in all these cases. Time over-
current protection may be set to
Disabled
during configuration.
For (sensitive) ground fault detection, address
131 Sens. Gnd Fault
is used to specify whether this function
should be enabled with definite time tripping characteristics (
Definite Time
), a
User Defined PU
and two
logarithmic inverse characteristics or
Disabled
.
For the intermittent ground fault protection, you can specify the measured quantity (
with Ignd
,
with 3I0
or
with Ignd,sens.
) to be used by this protection function at address
133 INTERM.EF
.
For negative sequence current protection, address
140 46
is used to specify whether the tripping characteris-
tics should be
Definite Time
,
TOC ANSI
or
TOC IEC
, or whether the function is to be
Disabled
.
For overload protection, address
142 49
allows you to specify whether the thermal replica of the overload pro-
tection will account for a coolant temperature or ambient temperature (
With amb. temp.
) or not (
No
ambient temp
), or whether the entire function is
Disabled
.
For the circuit-breaker maintenance function, several options are available under address
172 52 B.WEAR
MONIT
. Irrespective of this, the basic functionality of the summation current formation (
Σ
I
procedure) is always
active. It requires no further configurations and adds up the tripping currents of the trips initiated by the protec-
tion functions.
When selecting the
Σ
I
x
procedure , the sum of all tripping current powers is formed and issued as a 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 are issued as a reference
value.
For more detailed information about the circuit breaker maintenance procedures, see Section 2.17.2.