Source based protection of wind farms using a multi-function protection relay-its design and site trial experience

Laboratory simulation, relay testing and a site trial have been used to both validate and develop a new type of protection for small to medium sized wind farms (0-20 MW). The protection, implemented within a multifunction relay, is sufficiently sensitive to detect all realistic in-zone faults and correctly discriminates with the LV fuses that detect LV cable faults. Similarly, the site trial has confirmed that the source based protection is stable during out-of-zone faults and other types of network disturbances