10.11.8 Scheme with Capacitive CurrentCompensation (Blocking Mode)When the magnitude of the modulating quantity is less thanthe threshold of the squarer, transmission if it occurred, wouldbe a continuous blocking signal. This might occur at an endwith a weak source, remote from a fault close to a strongsource. A fault detector is required to permit transmission onlywhen the current exceeds the modulator threshold by somemultiple (typically about 2 times) so that the effective stabilityangle is not excessive. For PLCC schemes, the low set elementreferred to in Section 10.11.6 is usually used for this purpose.If the fault current is insufficient to operate the fault detector,circuit breaker tripping will normally occur sequentially.
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