Siemens SIPROTEC 7SD610 Manual page 32

Functions
2.1 General
Otherwise, set the number of desired reclosing attempts there. You can select 1 AR-cycle to 8 AR-cycles.
You can also set ASP (adaptive dead times); in this case the behaviour of the automatic reclosure function is
determined by the cycles of the remote end. However, at one end of the line the number of cycles must be con-
figured. This end must provide a reliable infeed. The other end can then operate with adaptive dead time. See
Subsection 2.10 for detailed information.
The AR control mode at address 134 allows a total of four options. On the one hand, it can be determined
whether the auto reclose cycles are carried out according to the fault type detected by the pickup of the starting
protection function(s) (only for three-pole tripping) or according to the type of trip command. On the other
hand, the automatic reclosure function can be operated with or without action time.
The setting Trip with T-action / Trip without T-action ... (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 (for every AR cycle) are possible after single-pole tripping and after three-pole trip-
ping. The tripping protection function determines the type of tripping: Single-pole or three-pole. The dead time
is controlled in dependence on this.
The setting Pickup with T-action / Pickup without T-action ... ... (Pickup with T-action ...)
is only possible and visible if only three-pole tripping is desired. 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 trip-
ping is configured (address 110 Trip mode = 3pole only, see above). In this case, different dead times
can be set for the auto reclose cycles following 1-, 2- and 3-phase faults. The decisive factor here is the pickup
situation of the protection functions at the instant the trip command disappears. This operating mode enables
making the dead times dependent on the type of fault also for three-pole reclosure cycles. Tripping is always
three-pole.
The setting Trip with T-action with action time) provides an action time for each auto-reclose cycle. The
action time is started by a general pickup of all protection functions. If there is no trip command yet when the
action time has expired, the corresponding automatic reclosure cycle cannot be executed. Section 2.10 pro-
vides detailed information on this topic. This setting is recommended for time-graded protection. If the protec-
tion function which is to operate with automatic reclosure, does not have a general pickup signal for starting the
action times, select Trip without T-action... (without action time).
Address 137 U/O VOLTAGE allows activating the voltage protection function with a variety of undervoltage and
overvoltage protection stages. In particular, the overvoltage protection with the positive sequence system of the
measuring voltages provides the option to calculate the voltage at the other, remote line end via integrated com-
pounding. This is particularly useful for long transmission lines where no-load or low-load conditions prevail and
an overvoltage at the other line end (Ferranti effect) is to cause tripping of the local circuit breaker. In this case
set address 137 U/O VOLTAGE to Enabl. w. comp. (enabled with compounding). Do not use compounding
on lines with series capacitors!
For the trip circuit supervision set at address 140 Trip Cir. Sup. the number of trip circuits to be monitored:
1 trip circuit, 2 trip circuits or 3 trip circuits, unless you omit it (Disabled).
If the device is connected to voltage transformers, set this condition in address 144V-TRANSFORMER. The
voltage dependent functions, such as the directional time overcurrent stages or the determination of voltage
related measuring values can only be activated by the device if voltage transformers are connected.
If a power transformer is located within the protected zone, set this condition in address 143 TRANSFORMER
order option). The transformer data themselves are then polled when parameterizing the general porotection
data (see 2.1.4.1).
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SIPROTEC, 7SD610, Manual
C53000-G1176-C145-6, Release date 02.2011