2.20 Function control and circuit breaker testing
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7SA522 Manual
C53000-G1176-C155-3
Figure 2-150 Generation of the energisation signal
The line energization detection enables the distance protection, earth fault protection,
time-overcurrent protection and high-current switch onto fault protection to trip without
delay after energization of their line was detected.
Depending on the configuration of the distance protection, an undelayed trip
command can be generated after energization for each pickup or for pickup in zone
Z1B. The stages of the earth fault protection and of the time-overcurrent protection to-
gether generate an undelayed TRIP command if this was provided for in the configu-
ration. The switch onto fault protection is released phase-selectively and three-pole in
case of manual closure after energization detection. In order to generate as quickly as
possible a trip command after an energization, the fast switch-on-to-fault protection is
released selectively for each phase already when the line is open.
In order to avoid that an energization is detected mistakenly, the state “line open”,
which precedes any energization, must apply for at least 250 ms.
2.20.1.2 Detection of the Circuit Breaker Position
For Protection Pur-
poses
Information regarding the circuit breaker position is required by various protection and
supplementary functions to ensure their optimal functionality. This is for example of as-
sistance for
• the echo function in conjunction with the distance protection with teleprotection
(refer to Subsection 2.6),
• the echo function in conjunction with directional earth fault comparison scheme
(refer to Subsection 2.8),
• weak infeed tripping (refer to Subsection 2.9.1),
• the high-current instantaneous tripping (refer to Subsection 2.12),
• the circuit breaker failure protection (refer to Subsection 2.18),
• verification of the dropout condition for the trip command (see Subsection “Termi-
nating the Trip Signal”).
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