FANUC A06B-6089-H104 Serial control card
Maximum Allowable Current Through the Relay Metrosil at the Setting Voltage During normal operation, the relay Metrosil leaks a small amount of current. As the Metrosil is in parallel with the relay, it is important to account for the leakage so the relay operates at the correct voltage/current.Also called Fault Clearing Time. On some relay protection schemes, there may be a longer delay between the fault and the relay operating. If this time is longer than 0.5s, the Metrosil will need to be de-rated.
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Identify the relevant tables for the application
For maximum internal secondary fault currents of up to 50Arms (typically 1A CTs) table 1 applies (see page 3). For maximum internal secondary fault currents of up to 150Arms (typically 5A CTs), table 2 applies (see page 3). The distinction between 1A and 5A devices is based on typical fault current requirements. It is acceptable to use a 1A Metrosil device with a 5A CT or vice versa, so long as the rated secondary fault current is not exceeded and all other parameters are appropriate.
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