How many current transformers do I Need?
current transformer is required for each metered circuit, so a three-phase four-wire installation requires three current transformers, whereas a three-phase three-wire installation needs only two. Polarity must be observed when fitting current transformers.
How do I connect a current transformer to a meter?
All current transformers are supplied with secondary terminals marked S1 and S2 which must be connected to the correct terminals on the meter. The meter will not register correctly if any of the CTs are connected incorrectly. The S1 terminal must be connected to the ‘current in‘ terminal for the appropriate phase on the meter.
What is a current transformer?
Current transformers are marked with the ratio between the maximum primary current and the maximum secondary current. For example a ‘600:5A’ CT produces a 5 A output signal when 600 A is flowing through the load. The primary rating must always be at least as large as the maximum current of the circuit to be monitored.
What if a current transformer is at a dangerous voltage?
Dangerous voltages are likely to be present in the vicinity of current transformers. The primary terminals (P1 and P2) of wound-primary CTs are at mains potential. Provision should be made for shorting the current transformers and isolating the meter from the voltage supplies to enable maintenance or removal of the meter.
Can a current transformer be installed in a wattnode meter?
Current transformers (CTs) are typically install in electrical equipment with lethal high voltage levels. Before attempting to install CTs read the CT Installation Safety page. CAUTION! WattNode meters are designed to work only with CTs that have a 0.333 Vac output.
Why do we need a current transformer?
Current transformers (CTs) are necessary for metering high currents, or currents at high voltage levels, because it would be impractical to design and manufacture electricity meters with sufficient current capacity and with adequate insulation levels to measure the current directly.
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ENSURE ALL CURRENT TRANSFORMERS ARE INSTALLED AS PER WIRING DIAGRAM (WHICH CAN ALSO BE ... (P1 FACING MAINS) and (P2 FACING LOAD) Check ALL S1 and …
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