Actually I'm looking for possible causes of 230-500kV transmission equipment failures in utility system with large scale renewable generation interconnected. For the cases were excessive transients or/and electrical resonance may be created by concentration of multiple mechanically switched...
Does anybody have any data about increasing harmonic penetration and possible electrical resonance in EHV transmission systems caused by utility scale renewable with nontraditional (non-synchronous) generation (Solar, PV, Wind, etc)?
Thanks for the advice.
Does anybody have any reliability and performance comparison between EHV CCVT and PT ? Is it utilities trend to use only CCVTs for protection, control and metering in EHV substations with microprocessor-based relays?
What is a common engineering practice of fusing or isolating 69-138kV potential instrument transformers connected directly to the substation bus in order to Doble test or perform other required maintenance without de-energizing the bus?