If a potential transformer is required, what specifications are required? Are there any recommended ones to use?
When connecting the PAN-42 sensor to a panel with phase-neutral voltages over 277VAC / 480V (such as 346/600VAC systems in Canada), it is necessary to use potential transformers (PTs) at the voltage inputs.
PTs must be chosen so that their output (secondary) voltage is always within PAN-42’s input voltage range (110-277VAC phase-neutral). It is recommended to use PTs with high voltage accuracy and minimal phase shift, in order to minimize the effect on PAN-42 measurement accuracy.
For Canadian 346/600VAC systems, it is recommended to use PTs with 346VAC inputs and 120VAC outputs, such as the following models:
• Instrument Transformers (ITI/GE) model 3VT468-346 (3-phase)
• Hammond Manufacturing model VT56A (1-phase)
• For noisy industrial environments, where voltage spikes are common: Hammond Power Solutions model PH50MGJ (1-phase) – connect to 380V input, 120V output
Note: The above PTs are recommended for use with the PAN-42 sensor, but they are not considered a part of the PAN-42 product, and Panoramic Power does not take responsibility for their certification status or suitability to the installation site.