| Current
Transformer Protection Units
METROSIL Current Transformer Protection Units (CTPU)
are used to prevent dangerous voltages being developed
on the secondary side of a current transformer if it
is accidentally open circuited. CTPUs also provide excellent
protection against over voltage in the secondary circuit
by high frequency switching surges in the primary, even
when the correct secondary burden is connected.
At normal operating voltages (with the CT burden connected)
the CTPU will pass insufficient current to affect the
accuracy of the measuring equipment. If the burden is
disconnected then the whole of the CT secondary current
passes through the CTPU, which limits the voltage to
a safe level.
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