Denver Technical Products is now able to offer current unbalance detectors. An example is the Model 2722, designed to monitor three-phase AC current or compare three single-phase AC currents.
A solid-state electronic sensing circuit drives an internal relay which energises during normal, balanced conditions; an unbalanced condition will cause the relay to drop out.
The Model 2722 accepts current inputs of up to 5 A and will consider 0 A as balanced, making the device suitable for use with three-phase heaters. Adjustments are available for percent of unbalance and time delay before tripping.
The unit will automatically reset on restoration of correct current balance, or a normally-closed momentary switch can be connected for a manual reset. External current transformers can be used to extend the operating current range.
Applications include the protection of motors and detecting open circuit of three-phase heating elements, burnt out lamps and any industrial process where phase balance is important.
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