© siemens ag 2010. all rights reserved. zone selective interlocking (zsi) functionality and...
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© Siemens AG 2010. All Rights Reserved.
Zone Selective Interlocking (ZSI)
Functionality and Structure of ZSIFor short circuit and ground fault as well
Application Guide
© Siemens AG 2010. All Rights Reserved.
Industry SectorPage 2
ZSI
ZSI
ZSI
ZSI
ZSI
ZSI
tZSI = 50 ms
tsd = 200 ms
tsd = 300 ms
ZSI
ZSI
ZSI
ZSI
ZSI
tZSI = 50 ms
tsd = 300 ms
A) B)
Example: ZSI function in the event of a short-circuit
ZSI OUT
ZSI OUT
ZSI IN
ZSI IN
ZSI OUT
ZSI OUT
ZSI IN
ZSI OUT
ZSI
ZSI
© Siemens AG 2010. All Rights Reserved.
Industry SectorPage 3
ZSI
ZSI
ZSI
ZSI
ZSI
ZSI
tZSI = 100 ms
tg = 400 ms
tg = 500 ms
ZSI
ZSI
ZSI
ZSI
ZSI
tZSI = 100 ms
tg = 500 ms
A) B)
Example: ZSI function in the event of a ground fault
ZSI OUT
ZSI OUT
ZSI IN
ZSI IN
ZSI OUT
ZSI OUT
ZSI IN
ZSI OUT
ZSI
ZSI
© Siemens AG 2010. All Rights Reserved.
Industry SectorPage 4
tsd = 200 ms
ZSI
ZSI
ZSI
ZSI
ZSI
tZSI = 50 ms
tsd = 300 ms
Example: ZSI function in the event of a short-circuit
ZSI OUT
ZSI IN
ZSI OUT
tsd = 100 ms
ZSITrip
tsd = 0 ms
tsd = 100 msTrip
With ZSI and without ZSI function in grading level 3
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2
3
© Siemens AG 2010. All Rights Reserved.
Rainer HuentemeierProductmanagerI BT LV GC MCCB
V2.0 2010
Thank you for your attention!
Zone Selective Interlocking (ZSI)