Furling systems prevents a wind turbine from overspeeding by turning the blades out of the wind to reducing the swept area.
For a wind turbine with a furling tail:
A switch installed across the 3 wild AC turbine output wires shorts all 3 phases together and stops the turbine within seconds.
Diversion Load Controller
Rechargeable batteries are an integral part of this wind turbine system, they clamp down the wind turbines high open-circuit voltage down to the system’s level, until the batteries are full.
From that point the system can become damaged as the batteries become overcharged, causing the electrolyte to bubble explosive hydrogen gas. Also, over charging batteries do not clamp wind turbine voltage down correctly which can allow the turbine to overspeed due to delayed furling.
A diversion load controller diverts the excess energy from the wind turbine to a dump load which is usually an array of air or water heating elements.
All power systems incorporate shutoff systems and circuit breakers. This includes shutoffs for maintenance or emergency shutoff as well as breakers to prevent an electrical overload.
Lightening & Grounding
Grounding is essential to prevent shock hazard and protect the system from nearby lightening strikes. A properly grounded system uses a single central ground rod for the entire electrical system connected to the negative battery terminal.
A wind turbine tower in lightening prone areas can have a separate ground rod at every guy wire anchor with each guy wire and ground connected to its neighbor plus a ground rod at the tower base which is all separate from the electrical system ground.