Setting Notes - Siemens SIPROTEC 7SJ61 Manual

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 131Sens. 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 (ΣI 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 ΣI
value. The 2P procedure continuously calculates the remaining lifespan of the circuit breaker.
2
With the I 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.
SIPROTEC, 7SJ61, Manual
C53000-G1140-C210-1, Release date 02.2008
x
procedure, the sum of all tripping current powers is formed and issued as a reference
Functions
2.1 General
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