Description
2.6 Protection system
3VA molded case circuit breakers with IEC certificate
Manual, 03/2019, A5E03603177010-03
83
Operating principle
The diagram below illustrates the operating principle of zone selective interlocking:
- - - Communication cable
t
i
"Virtual" tripping time of I protection
A
Output, transmits the blocking signal
t
SD
Delay time setting of S protection
E
Input, receives the blocking signal
t
ZSI
Delay time of all molded case circuit breakers
which detect the short circuit but do not receive
a blocking signal when ZSI is activated
The ZSI function acts on the S and G ranges of the tripping characteristic. Currents within
the I range (instantaneous short circuit) continue to cause instantaneous tripping.
Содержание SENTRON 3VA1
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