DER are connected into medium voltage levels in the network and the protection is rather basic. Self-powered relays are common which create unique test challenges. All together require a cost efficient but capable solution.
In large-scale generation stations, there are many aspects to consider when it comes to both protecting the assets and to ensuring a stable network, making the protection schemes rather complex.
The power transformer is the most valuable asset in the substation and therefore rigorous protections schemes have been developed to both protect it but also to keep the network up and running.
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