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The principle of operation of this relay is a based on a circuit in which the phase angle changes as the frequency varies. The phase relation between the current and the reference current produces a
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3 Application The frequency relay SPAF 140 C is designed to be used for the protection of power genera-tors and other AC equipment against overfre-quency and underfrequency. The
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2 Overfrequency protection function overview The graphic appearance of the function block of the overfrequency protection function is shown below. The block shows all binary input and output status
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As frequency is a reliable indicator of an overload situation, frequency sensitive relays can be used to disconnect a portion of the load automatically. This arrangement is referred to as Load-Shedding or
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