[anschlussbsp-ext-schutzger-fehlerab-pause-wlk-310702, 1, en_GB]
Figure 2-12
Connection example with external protection device for fault detection dependent dead time
— dead time control by pickup signals of the protection device; AR control mode = with
PICKUP
2 Protection Relays with 2 Automatic Reclosure Circuits
If redundant protection is provided for a line and each protection operates with its own automatic reclosure
function, a certain signal exchange between the two combinations is necessary. The connection example in
shows the necessary cross-connections.
If the auxiliary contacts of the circuit breaker are connected to the correct phases, a 3-pole coupling by the
7VK61 is ensured when more than one CB pole is tripped. This requires the activation of the forced 3-pole trip
(see Section
at margin heading “Forced 3-pole trip”). An external automatic 3-pole
coupling is therefore unnecessary if the above conditions are met. This prevents 2-pole tripping under all
circumstances.
For the connection according to
it must be considered that the cross connections to the second
protection must be interrupted during the check of one of the two protection systems with protection moni-
toring equipment. This is done, for example, by means of a test switch installed in between.
Alternatively, the variant with a minimum cross connection according to
case, the following information should be considered:
•
The switching state of the circuit breaker must be connected in a phase-selective way via the auxiliary
contacts to the corresponding binary inputs of both protection systems in case of a 1-pole reclosure. If
only 3- pole tripping is possible, the 3-pole status is sufficient.
•
In order to prevent that a very quick response (1-pole) of a protection leads to an undesired 3-pole
coupling of a second protection, a “software filter time” for the binary inputs of the auxiliary contacts is to
be set (refer to
Functions
2.2 Automatic reclosure function (optional)
SIPROTEC 4, 7VK61, Manual
55
C53000-G1176-C159-5, Edition 05.2018
Summary of Contents for SIPROTEC 4 7VK61
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