Power (Quality) Measurements
The LFR has market leading low frequency performance, optimised to give minimal phase error from 45Hz to 20kHz and the lowest possible noise floor. It can be used with frequency analysers, digital multimeters and oscilloscopes to perform a thorough power quality audit. The thin, flexible coil is easy to install even where conductors have been tightly bundled or space is restricted making it easy to identify sources of power quality disturbances.
20A per div, 4ms per div
Class 0.2 metering CT vs. the LFR
The LFR has exceptionally low phase shift between 45Hz to 20kHz enabling the measurement of the fundamental frequency and up to the 400th harmonic with excellent accuracy. The wide bandwidth allows the user to recognise and quantify some common power quality issues including THD, power factor and ground currents. The high frequency (-3dB) bandwidth of up to 1MHz is sufficient to detect some transient power quality disturbances and noise including capacitor bank switching and equipment inrush.
For even more demanding power quality applications requiring a wider bandwidth PEM also offer the CWTLF range.
Leakage and Ground Currents
When used in combination with a digital multimeter the LFR can be used to detect ground and leakage currents. The flexible coil is easy to install around large individual and multiple conductors as well as conduit trunking. The LFR coil can be supplied in standard lengths up to 1m and two turns can be made around a conductor (for coil lengths >=700mm only) to double the measurement and improve the SNR ratio.