while current flow is detected in both other phases. In this case, one of the indications will only be maintained
while the condition is met. This enables a single-pole automatic reclosure to be detected on an unloaded line.
Specially for applications with busbar side voltage transformers the indication
1pole open Lx
is additionally
transmitted if the phase-selective CB auxiliary contacts clearly show a single-pole open circuit breaker, and the
current of the affected phase falls below the parameter 1130 PoleOpenCurrent.
Depending on the setting of parameter 1136 OpenPoleDetect.the Open Pole Detector evaluates all avail-
able measured values including the auxiliary contacts (default setting w/ measurement) or it processes only
the information from the auxiliary contacts including the phase current values (setting Current AND CB). To
disable the Open Pole Detector, set parameter 1136 to OFF.
Pickup Logic of the Entire Device
Phase Segregated Fault Detection
The fault detection logic combines the fault detection (pickup) signals of all protection functions. In the case
of those protection functions that allow for phase segregated pickup, the pickup is output in a phase segre-
gated manner. If a protection function detects an earth fault, this is also output as a common device alarm.
Thus, the alarms
Relay PICKUP L1
,
Relay PICKUP L2
,
Relay PICKUP L3
and
Relay PICKUP E
are
available.
The above annunciations can be allocated to LEDs or output relays.
General Pickup
The pickup signals are combined with OR and lead to a general pickup of the device. It is signalled with
Relay
PICKUP
. If no function of the device is picked up any longer,
Relay PICKUP
disappears (indication “OFF”).
General device pickup is a precondition for a series of internal and external functions that occur subsequently.
The following are among the internal functions controlled by general device pickup:
•
Opening of a trip log: from general device pickup to general device dropout, all fault indications are
entered in the trip log.
•
Initialization of fault record: the storage and maintenance of fault values can also be made dependent on
the occurrence of a trip command.
•
Generation of spontaneous indications: Certain fault indications can be displayed as spontaneous indica-
tions (see margin heading “Spontaneous Indications”). In addition, this indication can be made
dependent on the general device trip.
•
Start action time of automatic reclosure (if available and used).
External functions may be controlled by this indication via an output contact. Examples are:
•
Channel boost in conjunction with signal transmission by PLC.
•
Further additional devices or similar.
Spontaneous Displays
Spontaneous indications are fault indications which appear in the display automatically following a general
fault detection or trip command of the device. For the 7VK61, these indications include:
“Relay PICKUP”:
Protection function that picked up;
PU Time
:
Operating time from the general pickup to the dropout of the device, in ms;
TRIP Time
:
the operating time from general pickup to the first trip command of the device, in ms;
Tripping Logic of the Entire Device
General Trip
All trip signals for the functions are connected by OR and generate the message
Relay TRIP
. This can be
allocated to LED or output relay.
2.8.1.4
2.8.1.5
Functions
2.8 Function Control and Circuit Breaker Test
SIPROTEC 4, 7VK61, Manual 155
C53000-G1176-C159-5, Edition 05.2018
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