Reverse Power trip from a load?

[Fraser21]

Looking for some insight on a problem I’m running into. Doing some troubleshooting at a satellite dish site, Main breaker has a reverse power, and a directional relay along with an over current relay. The board has a sole purpose of feeding de-ice heaters to melt ice off of the big dishes during the winter. We have isolated all ties to the board and are just running off of the utility main and de-ice feeder breakers. None of which have ground fault. When the resistive load from the heaters comes on, and sometimes when the load comes off the board the directional and reverse power relay both pickup and sometimes trip the 86 and take out the main...any idea what would cause this?

 

[waross]

A CT is connected backwards?
You don't say if you have any on-site generation.
Please post a one-line diagram.


Bill
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"Why not the best?"
Jimmy Carter

 

[unclebob]

is this a new installation?

 

[waross]

The reverse power circuit is to prevent a situation where grid power back-feeds into the solar inverters.
When the resistive load exceeds the solar output, the reverse power circuit assumes a back-feed into the inverters.
Re-connect the resistive loads on the grid side of the reverse power sensing CTs.

Bill
--------------------
"Why not the best?"
Jimmy Carter