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ABSTRACT
This paper describes the dynamic characteristic of phase mho relays
which use the faulted phase voltage as the polarizing quantity,
and which have าmemory actionำ in the polarizing circuit. The dynamic
characteristic begins as a large circle whose diameter is determined
by the equivalent source impedance behind the relay, and then shrinks
to the steady-state mho circle as the memory action decays. This
provides much more fault resistance capability for close-in faults
than is indi- cated by the steady-state characteristic.
Dynamic Characteristics
of Mho Distance Relays 
[GER3742.PDF 190K]
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