CYG PRS-7367 User Manual

Protection Functions
64 PRS-7367
signals from the other protection functions such as distance or overcurrent functions, or on the
measured internal voltage and current levels or on both.
The SOTF_Op output can be blocked by activating the SOTF_Blk input.
Table 3.6-4 Options for SOTF control
Value of SOTF_Op_Mod
Description
“1”
The operate output is activated immediately after a signal from the trigger module.
This indicates that the breaker is closed onto fault.
“2”
The operate output is activated immediately after a signal from the SOTF detection
module. This indicates that the breaker is closed onto fault. This operation mode
can be used, for example, if the non-directional distance zone is not available.
“3”
The operate output is activated immediately after a signal from the trigger or SOTF
detection modules. This indicates that the breaker is closed onto fault.
3.6.3 SOTF Application Scope
The operation of SOTF is generally based on the non-directional distance zone or the
non-directional overcurrent stage. Other protection functions, like time delayed zero sequence
overcurrent functions, can be connected to SOTF to increase the dependability of the scheme.
The other main advantage of using SOTF is that it typically accelerates the tripping in case of
energizing a feeder onto a fault. Without SOTF, this tripping is normally performed by the normal
time-graded protection or alternatively by the time-delayed local backup protection, for which
operate times are considerably longer than with SOTF tripping.
An internal dead-line detection check is provided to activate the function when the voltage
transformers are located on the feeder side. An initiation by the dead-line detection is highly
recommended for the busbar configurations where more than one circuit breaker at one feeder
end can energize the protected feeder or the feeder can also be energized from the other end.
3.6.4 SOTF Settings
Table 3.6-5 SOTF settings
No.
Name
Values(Range
)
Unit
Step
Default
Description
1
SOTF_Ena
0~1
-
1
1
Operation Enable/Disable
2
SOTF_Op_Mod
1~3:
Start
Current&Volta
ge
Both
-
1
1
Mode of operation of SOTF
Function: 1-3 for External Start
Signal Mode, Current&Voltage
Mode, and
Both
3
SOTF_ Init _Mod
0~3
DLD disabled
Voltage
Current
Current&Volta
ge
-
1
1
Automatic switch onto fault
initialization mode:0-3 for
disabled , Voltage, Current,
Current&Voltage

CYG PRS-7367 Specifications

General

Brand	CYG
Model	PRS-7367
Category	Control Unit
Language	English