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  1. yms

    EHV power quality with renewable gen

    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...
  2. yms

    EHV power quality with renewable gen

    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)?
  3. yms

    230-500kV inductive PT replacement with CCVT or optical VT

    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?
  4. yms

    230-500kV inductive PT replacement with CCVT or optical VT

    Is it feasible to replace 230-500kV PTs with CCVTs or optical voltage transformers from the reliability point of view during major substation upgrade?
  5. yms

    Isolating 69-138kV potential instrument transformers

    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?
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