ZSI - (micropro2)
49
C&S Electric Limited
ZSI – Zone Selective Interlocking (micropro2)
Zone selective interlocking drops delay time that eliminates fault for breakers. It minimize
the shock that all kind of electric machineries get under fault conditions.
In case of that short time-delay or ground fault accident occurs at ZSI built in system,
the breaker at accident site sends ZSI signal to halt upstream breaker's operation.
To eliminate a breakdown, trip relay of ACB at accident site activates trip operation
without time delay.
The upstream breaker that received ZSI signal adhere to pre-set short time delay or
ground fault time-delay for protective coordination in the system. However upstream
breaker that did not receive its signal will trip instantaneously
Fpor ordinary ZSI operations it should arrange operation time accordingly so that
downstream breaker will react before upstream ones under overcurrent/short time
delay/ ground fault situations.
ZSI connecting lines need to be Max. 3m.
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1) Occurrence of fault A
- Only Breaker 1 performs instantaneous trip operation
2) Occurrence of fault B
- Breaker 2 perform instantaneous trip operation, breaker 1 perform trip operation
after prearranged delay time
- But if Breaker 2 did not break the fault normally, breaker 1 perform instantaneous
trip operation to protect system.
Z1
Z2
Z3
Z4
ZSI Input
Fault A
Z1
Z2
Z3
Z4
ZSI Input
Fault B
ZSI Output
Z1
Z2
Z3
Z4
Z1
Z2
Z3
Z4
Z1
Z2
Z3
Z4
48 C&S Electric Limited
Communication
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Operation Mode : Differential
Distance : 1.2 km
Cable : General RS-485 Shielded twist 2 pair cable
Baud rate : 9600 bps, 19200 bps, 38400 bps
Transmission Method : Half-duplex
Termination : 100
Modbus / RS-485
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Profibus-DP Module is installed separately (optional)
Operation Mode : Differential
Distance : 1.2 km
Cable : Profibus-DP Shielded twist 2 pair cable
Baud rate : 9600 bps~12Mbps
Transmission Method : Half-duplex
Termination : 100
Standard : EN 50170/DIN19245
Profibus - DP
W Nmaster 2i
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