Siemens siprotec SJ62 User Manual page 39

2 Functions
Special Character-
istics
37
Most settings are self-explanatory. However, special characteristics are described
below.
If the setting group change function has to be used, address 103 Grp Chge OPTION
must be set to Enabled. In service, simple and fast changeover between up to four
different groups of settings is possible Only one setting group may be selected and
used if this option is Disabled.
For the relay elements associated with non-directional overcurrent protection (sepa-
rately for phase and ground), various tripping characteristics may be selected at ad-
dresses 112 Charac. Phase and 113 Charac. Ground. If only the definite time
characteristic is desired, then Definite Time should be selected. Additionally, de-
pending on the relay type ordered, various inverse time characteristics, based on
either IEC (TOC IEC) standards or ANSI (TOC ANSI) standards, or user-defined
characteristic are available for selection. The dropout behavior of the IEC and ANSI
characteristics will be specified later with settings (addresses 1210 and 1310), how-
ever, for the user-defined characteristic you determine in address 112 and 113
whether to specify only the pickup characteristic (User Defined PU) or the pickup
and the reset time characteristic (User def. Reset).
The superimposed high-current element 50-2 or 50N-2 is available in all these cases.
Time overcurrent protection can be disabled by setting the function to Disabled.
For directional overcurrent protection, the same information that was entered for the
non-directional overcurrent protection can be entered at addresses 115 67/67-TOC
and 116 67N/67N-TOC.
For (sensitive) ground fault detection, address 131 Sens. Gnd Fault is used to
specify whether this function should be enabled with definite time tripping characteris-
tics (Definite Time), a User Defined PU and two logarithmic inverse character-
istics or disabled by setting to Disabled.
For the intermittent ground fault protection specify in address 133 INTERM.EF the
measured quantity (with Ignd, with 3I0 or with Ignd,sens.) which is to be
used by this protection function.
For negative sequence current protection, address 140 46 is used to specify whether
the tripping characteristics should be Definite Time, TOC ANSI or TOC IEC, or
whether the function is to be Disabled.
Set in address 142 49 for the overload protection whether (With amb. temp.) or
not (No ambient temp) the thermal replica of the overload protection will account
for a coolant temperature or ambient temperature or whether the entire function is set
to Disabled.
The flexible protective functions (only 7S64) can be configured in parameter
FLEXIBLE FUNC.. You can create max. 20 functions. This can be done by marking
(setting ticks) the functions (see example in Section 2.18). If the marking (the tick) of
a function is removed, all the settings and allocations previously made are lost. All the
settings and locations are located in the default setting when a new marking of the
function takes place. The setting of the flexible function is performed in DIGSI under „
Parameter", „Additional Functions" and„ Settings". The allocation is performed, as
usually, under „Parameter" and „Allocation".
Up to four function groups are available for the synchronizing function. They are
enabled in address 016x (x = 1 ... 4). Parameters 161 25 Function 1 to 164 25
Function 4 indicate whether a synchronizing function is to be Disabled or
Enabled. The latter is determined by selecting the operating mode ASYN/SYNCHRON
(closing takes place for asynchronous and synchronous conditions) or
SYNCHROCHECK (corresponds to the classical synchro-check function). The function
groups which are configured to be enabled via ASYN/SYNCHRON or SYNCHROCHECK
SIPROTEC 4, 7SJ62/63/64 Handbuch
C53000-G1140-C147-A, Edition 07.2015