Siemens SIPROTEC 4 7VK61 - Function Control and Circuit Breaker Test

Function Control and Circuit Breaker Test
Function Control
The function control is the control centre of the device. It coordinates the sequence of the protection and
ancillary functions, processes their decisions and the information coming from the power system.
Applications
•
Line energization recognition,
•
Processing of the circuit breaker position,
•
Open Pole Detector,
•
Fault detection logic,
•
Tripping logic.
Closure Detection
During energization of a protected object, several measures may be required or desirable. Following manual
closing onto a short-circuit, for instance, immediate re-opening of the circuit breaker is usually desired. For
most short-circuit protection functions, at least one stage can be selected to trip without delay following
energization as described in the corresponding sections.
The manual closing command must be indicated to the device via a binary input. In order to be independent
of the individual manual actuation, the command is set to a defined length in the device (adjustable with the
address 1150 SI Time Man.Cl). This setting can only be changed in DIGSI at display Additional Settings.
Figure 2-63 shows the logic diagram.
[logik-7vk61-hand-ein, 1, en_GB]
Figure 2-63
Logic diagram of the manual closing procedure
2.8
2.8.1
2.8.1.1
Functions
2.8 Function Control and Circuit Breaker Test
SIPROTEC 4, 7VK61, Manual 149
C53000-G1176-C159-5, Edition 05.2018