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The non-linear behaviour of silicon carbide varistors can be used to prevent high voltages from damaging protection systems, used in electricity T&D networks. Such ‘overvoltages’ may be created when high current transients are incident on high impedances within the protection systems. These may be due to the type of protection system used or created when current transformers are left in open circuited...
Developments in substation secondary systems in the future will include more and more the process bus as means to exchange data between sensor and actuators, and control and protection devices, known as Intelligent Electronic Devices (IEDs). Secondary systems will use data coming from different sensors, such as conventional current transformers (CTs) and voltage transformers (VTs) directly attached...
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