Reverse Power Relays how do they work?

Forum Title: Reverse Power Relays how do they work?

Folks,I understand why and where RPR are used. What I do not understand is how they determine the direction of power flow. Can anybody help me?Thanks

Category: General Electrical Discussion Post By: Adam Wilkes (Sprigg, OH), 03/23/2017

Voltage drop across a resistor.Simple.

- Quey By Tony Atkins (North Woodbury, PA), 03/25/2017

Tesla, that describes a current shunt.Where I am familiar with reverse power relays is when you have multiple paralelled generators or a generator tied to the grid. If the prime mover slows down, the slower generator turns into a motor and consumes power instead of producing power. This motoring action can then damage the prime mover. Looking at the tech sheets, there are connections to current transformers and potential transformers, but how do you determine the direction of power flow?Larry

- Thomas Mouelle (Aubbeenaubbee, IN), 03/25/2017

I am guessing here but I bet it is by seeing which one has the higher voltage, by looking at that resistor.Power will always flow from a higher voltage to a lower voltage and if you compare volts in and out of a resistor you can see which end is higher. We are talking about a pretty small delta.

- Melissa H (Smithland, KY), 03/25/2017

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