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Zone Selective Interlocking (ZSI)

Zone Selective Interlocking (ZSI). Functionality and Structure of ZSI For short circuit and ground fault as well Application Guide. t sd = 300 ms. ZSI. ZSI. t sd = 300 ms. ZSI OUT. ZSI OUT. t sd = 200 ms. ZSI. ZSI IN. ZSI IN. ZSI. t ZSI = 50 ms. ZSI OUT. ZSI OUT.

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Zone Selective Interlocking (ZSI)

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  1. Zone Selective Interlocking (ZSI) Functionality and Structure of ZSIFor short circuit and ground fault as well Application Guide

  2. tsd = 300 ms ZSI ZSI tsd = 300 ms ZSI OUT ZSI OUT tsd = 200 ms ZSI ZSI IN ZSI IN ZSI tZSI = 50 ms ZSI OUT ZSI OUT tZSI = 50 ms ZSI ZSI IN ZSI OUT Example: ZSI function in the event of a short-circuit A) B) ZSI ZSI ZSI ZSI ZSI ZSI ZSI ZSI

  3. tg = 500 ms ZSI ZSI tg = 500 ms ZSI OUT ZSI OUT tg = 400 ms ZSI ZSI IN ZSI IN ZSI tZSI = 100 ms ZSI OUT ZSI OUT tZSI = 100 ms ZSI ZSI IN ZSI OUT Example: ZSI function in the event of a ground fault A) B) ZSI ZSI ZSI ZSI ZSI ZSI ZSI ZSI

  4. ZSI ZSI Example: ZSI function in the event of a short-circuit ZSI OUT 1 ZSI tsd = 300 ms ZSI IN With ZSI and without ZSI function in grading level 3 ZSI OUT ZSI ZSI tZSI = 50 ms tsd = 200 ms Trip 2 tsd = 0 ms  tsd = 100 ms tsd = 100 ms ZSI Trip 3

  5. Thank you for your attention! Zone Selective Interlocking (ZSI) Rainer Huentemeier Productmanager I BT LV GC MCCB V2.0 2010

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