Shop current transformers (CTs) built for precise, safe measurement of high currents in industrial electrical systems, with a range of frame sizes and ratios to suit any busbar or cable dimension. Trusted for compliant energy monitoring and protection schemes.
N.A.W. Controls’ Current Transformers produce an alternating current in the secondary winding proportional to the primary current, allowing safe measurement of large currents using standard instrumentation. Built to withstand the demands of Australian industrial applications, our range features various frame sizes and ratios to suit a wide array of busbar and cable dimensions.
Correct installation is critical, ensuring secondary signals reach measuring devices accurately without phase shift or ratio errors, whether you’re integrating a meter for energy billing or system protection. These CTs work seamlessly with our broader metering range – pairing with 22mm metered indicator lights for basic status monitoring, multifunction power meters for detailed energy tracking, or a portable power analyser for onsite diagnostics.
A current transformer steps down high primary currents to a lower, standardised value, typically 1A or 5A, allowing standard measuring instruments and protective relays to safely monitor high-power circuits without direct exposure to the full system voltage and current.
Ensuring a proper connection involves verifying the polarity and making sure the secondary circuit is never left open-circuited while the primary is energised. An open secondary can lead to dangerously high voltages, so it’s vital to follow manufacturer guidelines and Australian safety standards during installation.
Most standard meters are compatible as long as the meter input matches the secondary output of the transformer, usually 5A. It’s important to match the accuracy class of the transformer to the requirements of the meter for precise energy readings.
What is the difference between protection and measurement current transformers?
Measurement CTs are highly accurate at normal operating currents but saturate quickly during a fault to protect connected instruments. Protection CTs maintain accuracy at much higher current levels to ensure protective relays function correctly during a short circuit or overload.
How do I choose the right CT ratio for my application?
CT ratio should match the maximum expected load of the circuit being measured – for example, a 100/5 CT suits circuits up to 100A. Oversized CTs reduce measurement accuracy, while undersized CTs risk overload, so our team can help match the right ratio and class to your application.
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