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Figure 2.10-18 Z1S MHO element non-directional†
†Note: The tilted line, crossing the originate, instructs the function of the non-directional
element.
Figure 2.10-19 Z1S Quad element non-directional
Function and classification of 6 zones
Table 2.10-2 provides a summary of the zones and characteristics for each element. Z1XS and
Z1XG can be set to cover ≤ 100% of the protected line in their respective zones of protection in
order to provide extended coverage beyond the settings of Z1S and Z1G. On the other hand,
Z5S and Z5G, can be set to protect beyond 100% of the protected line. The element
characteristic used for Z1XS and Z5S is similar and so is the element characteristic for Z1XG
and Z5G.
Note that the elements Z2S to Z5S and the Z2G to Z5G can have either the Mho or the
Quad characteristic element, but these elements do not have the ‘knee’ function.
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