A Q400 flight crew experienced a flap power failure during approach with flaps at ten degrees. After complying with QRH procedures and declaring an emergency a ten degree flap landing was made.

Narrative

We began an approach to our assigned runway and started to configure our aircraft for landing. After selecting flaps five and gear down we then continued configuration with flaps ten and fifteen. Shortly after selecting flaps to fifteen degrees we observed a master caution on the caution warning panel for FLAP POWER. The flap indicator showed our flaps were at ten degrees; not the selected fifteen. We then notified ATC and executed a missed approach climbing to 3;000 FT via radar vectors. At which point we began QRH procedures and notified Dispatch via ACARS. After completing QRH procedures we contacted Maintenance Control and Dispatch via a phone patch. Maintenance Control instructed us not to reselect another flap setting and to leave flaps at current position. This position was ten degrees. Due to a lack of a flap ten approach profile and unable to move this flight control surface; an emergency was declared with ATC. We requested to land on the longest runway. We resent for landing data via ACARS respective to flaps ten. We then re-ran a descent checklist and notified operations and flight attendants of our condition. Our flight attendants prepared for an emergency landing. We were then given vectors and cleared for the approach. We then landed successfully without incident and taxied off the runway to our gate without event.