Siemens siprotec 7SA522 User Manual

2.1 General
35
7SA522 Manual
C53000-G1176-C155-3
The setting 7ULSZLWK7DFWLRQ7ULSZLWKRXW7DFWLRQ (default
setting = Trip with T-action ...) is preferred if single-pole
or single-pole/three-pole auto-
reclose cycles are provided for and possible. In this case different dead times after
single-pole tripping on the one hand and after three-pole tripping on the other hand are
possible (for every reclose cycle). The protective function that issues the trip
command determines the type of trip: single-pole or three-pole. Depending on the
latter the dead time is selected.
The setting 3LFNXSZLWK7DFWLRQ3LFNXSZLWKRXW7DFWLRQ
(Pickup with T-action ...) is only possible and visible if only three-pole tripping is de-
sired. This is the case when either the ordering number of the device model indicates
that it is only suited for three-pole tripping, or when only three-pole tripping is config-
ured (address  7ULSPRGH = SROHRQO\, see above). In this case you can set
different dead times for the auto-reclose cycles following single-pole
, two-pole and
three-pole
faults. The decisive factor here is the pickup situation of the protective
functions at the instant the trip command disappears. This control mode enables also
the dead times to be made dependent on the type of fault in the case of three-pole
reclosure cycles. Tripping is always three-pole.
The setting 7ULSZLWK7DFWLRQ provides an action time for each reclose cycle.
The action time is started by a general pickup of all protection functions. If no trip
command is present before the action time expires, the corresponding reclose cycle
is not carried out. Section 2.13 provides detailed information on this topic. This setting
is recommended for time-graded protection. If the protection function which is to
operate with automatic reclosure, does not have a general pickup signal for starting
the action times, select 7ULSZLWKRXW7DFWLRQ.
Address  allows the voltage protection function to be activated using various und-
ervoltage and overvoltage elements. Particularly, the overvoltage protection with the
positive sequence system of the measured voltages provides the option to calculate
the voltage at the other line end via integrated compounding. This is particularly useful
for long transmission lines where no-load or low-load conditions prevail and an over-
voltage at the other line end (Ferranti effect) is to cause tripping of the local circuit
breaker. In this case set address  8292/7$*( to (QDEOZFRPS (available
with compounding). Do not use compounding in lines with series capacitors!
The fault location can be set at address  )DXOW/RFDWRU to (QDEOHG or
'LVDEOHG.
For the trip circuit supervision set at address  7ULS&LU6XS the number of
trip circuits to be monitored: WULSFLUFXLW, WULSFLUFXLWV or WULS
FLUFXLWV, unless you omit it ('LVDEOHG).
2.1.1.3 Settings
Addr. Parameter Setting Options Default Setting Comments
103 Grp Chge OPTION Disabled
Enabled
Disabled Setting Group Change Option
110 Trip mode 3pole only
1-/3pole
3pole only Trip mode
112 Phase Distance Quadrilateral
MHO
Disabled
Quadrilateral Phase Distance

Siemens siprotec 7SA522 Specifications

General

Brand	Siemens
Model	siprotec 7SA522
Category	Protection Device
Language	English