Scottish and Southern Electricity Networks, Scottish Hydro Electric Transmission and SP Transmission
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Network Innovation Allowance
ET - Network improvements and system operability
High Voltage Technology
The efficient running of high voltage Alternating Current (AC) networks involves, among other things, the management of reactive power flows. Transmission lines and cables tend to generate reactive power which requires to be compensated for to manage voltage profiles and reduce energy losses on the system. During periods of low loading, the voltage on a long transmission line or cable may increase along the circuit with the potential to fall outside the operational limits and equipment voltage design ratings which could result in equipment failure. One effective way to manage system voltages within desired operational limits is the use of shunt reactors where the system is susceptible to high voltages. The transmission networks in GB have several installations with shunt reactors connected in different configurations including, but not limited to, line connected, busbar connected and auto-transformer tertiary connected to manage system voltages.
· An investigation into the ZMP DC current problem in detail (cause, consequences and likelihood).
· An investigation into the capability of circuit breakers to interrupt the prospective fault current
· An investigation into mitigation options and strategies (and developing them)
· Risk analysis of any viable mitigation options and strategies
· Establish the planning, training, operation and maintenance requirements of any viable mitigation options
· Compile reports with results of the study for dissemination and to decide the viability of live trials of the mitigation options