Overload Rotation to Increase Capacity of Transmission Boundaries
National Grid Electricity Transmission
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Network Innovation Allowance
ET - New technologies and commercial evolution
It is envisaged that the capacity of transmission boundaries can be increased by overloading the individual boundary circuits for a limited time period and then reducing their loading whilst overloading other circuits in the next time period. This is the concept of rotating overloads across different circuits exploiting the existing overload ratings of the assets. This rotation of overloading may provide an effective increase in boundary power flows under normal and fault conditions.
This is deemed appropriate because requirements for high power transfers are usually limited to 1 to 2 hours during system operation. On the other hand, in many European countries, overcurrent protection is set to 120% for, typically 20 minutes; this spare capacity can be used in the case of system.
The objectives of this project is to determine the feasibility of overload rotation and quantify the benefits it can provide.