Based on a patent pending optical sensor design, the HVSS provides a means to reliably and precisely measure ultra-high voltage. The all dielectric sensor configuration intrinsically eliminates the concern of arcing often associated ultra-high voltage environments. It uniquely offers many advantageous features: accurate voltage measurement with zero phase shift and low noise flat response through 20th harmonic; lightweight; inductance based self-powered build-in. The design is an all-in-one unit that can be directly mounted onto a high voltage conductor cable. Custom configurations are available, including fiber readoput, blue tooth communication to an adjacent transmission unit.