Siemens siprotec 7SD5, Руководство пользователя

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2 Functions
304
7SD5 Manual
C53000-G1176-C169-1
Forced Three-pole
Trip If reclosure is blocked during the dead time of a single-pole cycle without a three-pole
trip command having been initiated, the breaker remains open at one pole. With
address
3430 AR TRIP 3pole
it is possible to determine that the tripping logic of the
device issues a three-pole trip command in this case (pole discrepancy prevention for
the CB poles). Set this address to
YES
if the CB can be tripped single-pole and has no
pole discrepancy protection itself. Nevertheless, the device pre-empts the pole dis-
crepancy supervision of the CB because the forced three-pole trip of the device is im-
mediately initiated as soon as the reclosure is blocked following a single-pole trip or if
the CB auxiliary contacts report an implausible breaker state (see also Section 2.15 at
margin heading „Processing the Circuit Breaker Auxiliary Contacts“). The forced
three-pole coupling is also activated when only three-pole cycles are allowed, but a
single-pole trip is signalled externally via a binary input.
The forced three-pole coupling is unnecessary if only a common three-pole control of
the CB is possible.
Dead Line Check Under address
3431
the dead line check can be switched active. It presupposes that
voltage transformers are installed on the line side of the feeder and connected to the
device. If this is not the case or the function is not used, set
DLC / RDT
=
WITHOUT
.
DLC / RDT
=
DLC
means that the dead line check of the line voltage is used. This
only enables reclosure after it becomes apparent that the line is dead. In this case, the
phase-earth voltage limit is set in address
3441 U-dead<
below which the line is con-
sidered voltage-free (disconnected). The setting is applied in Volts secondary. This
value can be entered as a primary value when parameterizing with a PC and DIGSI
®
.
Address
3438 T U-stable
determines the measuring time available for determining
the no-voltage condition. Address
3440
is irrelevant here.
Adaptive Dead
Time (ADT) When operating with adaptive dead time, it must be ensured in advance that one end
per line operates with defined dead times and has an infeed. The other (or the others
in multi-branch lines) may operate with adaptive dead time. It is essential that the
voltage transformers are located on the line side of the circuit breaker. Details about
this function can be found in Section 2.15 at margin heading „Adaptive Dead Time
(ADT) and Close Command-transfer (Remote-CLOSE)“.
For the line end with defined dead times the number of desired reclose cycles must be
set during the configuration of the protective functions (Section 2.1.1) in address
133
Auto Reclose
. Additionally, the intertrip command of the differential protection
should be activated (see Section 2.4, address
1301 I-TRIP SEND
=
YES
). For the
devices operating with adaptive dead time, address
133 Auto Reclose
must have
been set to
ADT
during the configuration of the protective functions (Section 2.1.1).
Only the parameters described below are interrogated in the latter case. No settings
are then made for the individual reclosure cycles.
The adaptive dead time may be voltage-controlled or Remote–CLOSE–controlled.
Both are possible at the same time. In the first case, reclosure takes place as soon as
the returning voltage, after reclosure at the remote end, is detected. For this purpose,
the device must be connected to voltage transformers located on the line side of the
circuit breaker. In the case of remote-close, the device waits until the remote-close
command is received before issuing the reclose command.
The action time
T-ACTION ADT
(address
3433
) is the timeframe after initiation (fault
detection) by any protective function which can start the automatic reclosure function
within which the trip command must appear. If no trip command is issed until the action
time has expired, there is no reclosure. Depending on the configuration of the protec-
tive functions (see Section 2.1.1.3), the action time may also be omitted; this applies
especially when an initiating protective function has no fault detection signal.
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