Siemens SIPROTEC 4 7SJ61 User Manual

The threshold value setting applies to all three phases, and must take into consideration all used protection
functions.
The pickup threshold for the breaker failure protection is set separately (see Section 2.12.2 Setting Notes).
When using the device as motor protection and using the overload protection, load jam protection and restart
inhibit, the protective relay can distinguish between a running motor and a stopped motor, as well as take into
account the different motor cooldown behavior. For this application, the set value must be lower than the
minimum no-load current of the motor.
Circuit-breaker Maintenance (Breaker)
Parameters 260 to 267 are assigned to CB maintenance. The parameters and the different procedures are
explained in the setting notes of this function (see Section 2.17.2 Statistics).
Two-phase Time Overcurrent Protection (Protection Operating Quantities)
The two-phase overcurrent protection functionality is used in grounded or compensated systems where inter-
action of three-phase devices with existing two-phase protection equipment is required. Via parameter 250
50/51 2-ph prot the time overcurrent protection can be configured to two or three-phase operation. If the
parameter is set to ON, the value 0 A instead of the measured value for Ι
B
is used permanently for the
threshold comparison so that no pickup is possible in phase B. All other functions, however, operate in three
phases.
Ground Fault Protection (Protection Operating Quantities)
Parameter 613 50N/51N/67N w. defines whether ground fault protection, breaker failure protection or Fuse
Failure Monitor is either to operate using measured values (Ignd (measured))) or the quantities calculated
from the three phase currents (3I0 (calcul.)). In the first case, the measured quantity at the fourth
current input is evaluated. In the latter case, the summation current is calculated from the three phase current
inputs. If the device features a sensitive ground current input (measuring range starts at 1 mA), the ground
fault protection always uses the calculated variable 3I0. In this case, parameter 613 50N/51N/67N w. is not
available.
Settings
Addresses which have an appended “A” can only be changed with DIGSI, under “Additional Settings”.
The table indicates region-specific presettings. Column C (configuration) indicates the corresponding secon-
dary nominal current of the current transformer.
Addr.
Parameter C Setting Options Default Setting Comments
201 CT Starpoint towards Line
towards Busbar
towards Line CT Starpoint
204 CT PRIMARY 10 .. 50000 A 100 A CT Rated Primary Current
205 CT SECONDARY 1A
5A
1A CT Rated Secondary
Current
207 Vnom-PRI VT V4 0.10 .. 800.00 kV 12.00 kV VT Rated Primary Voltage
V4
208 Vnom-SEC VT V4 100 .. 225 V 100 V VT Rated Secondary
Voltage V4
209 PHASE SEQ. A B C
A C B
A B C Phase Sequence
210A TMin TRIP CMD 0.01 .. 32.00 sec 0.15 sec Minimum TRIP Command
Duration
211A TMax CLOSE CMD 0.01 .. 32.00 sec 1.00 sec Maximum Close Command
Duration
212 BkrClosed I MIN 1A 0.04 .. 1.00 A 0.04 A Closed Breaker Min.
Current Threshold
5A 0.20 .. 5.00 A 0.20 A
2.1.3.3
Functions
2.1 General
SIPROTEC 4, 7SJ61, Manual 39
C53000-G1140-C210-6, Edition 05.2016

Siemens SIPROTEC 4 7SJ61 Specifications

General

Brand	Siemens
Model	SIPROTEC 4 7SJ61
Category	Relays
Language	English