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Some makers supply an instruction plate indicating the exact current at which the relay will operate with a given time setting. Earth indication The method most commonly used for indicating the state of insulation of the system consists of two lamps, each not exceeding 30 W and each suitable for the full voltage of the system, connected in series and with the mid-point earthed. If the insulation of the system is healthy each lamp will be on half-voltage and correspondingly dimmed, but should there be a direct fault to earth on one pole the lamp on that pole will be short-circuited and the opposite lamp will attain full brilliance.
O a. 5 Typical time/current characteristics of cartridge fuses The minimum fusing current is the minimum current at which a fuse-element will melt. Discrimination Discrimination is a complex subject and can only be briefly dealt with. It will be appreciated that a circuit connected t o a distribution board may be fed through three, if not four, fuses or circuit breakers in series. For example a heating circuit may connect to a 15 A fuse in a fuse-box fed from a section board through a 100 A fuse, and the section board may be fed in turn from a 500 A circuit breaker on the main board.
C. voltage is then taken to the. reference bridge and compared with a reference voltage. If the voltage differs from the reference voltage a voltage is produced which, after amplication is applied to the thyristor firing circuit which in turn controls the point in the positive half-cycle at which the thyristor is fired and in so doing controls the machine excitation. Thus a sudden load change or other change in generator output voltage will vary the thyristor firing angle and correct the field voltage in the required direction.
