Proceedings PaperThe Traser System: For Light-Coupled Current Measurement At EHV
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The TRASER system is now capable of delivering the design-goal specifications of revenue-accuracy current measurements under any ambient temperature condi-tions from -70 F to + 170 F and from line-charging through full-fault current levels, with other interest-ing advantages. Twin channels of identical measurement, with milli-second throwover between channels, insure service availability at all times. In addition to a power supply activated by potential of the energized line, separate power sources operated by line current are provided for each channel. Full operation is accomplished within two milliseconds after closing into a short circuit, as suringprotective relay operating during the first current loop if desired. Solid-state relay logic is highly compatible with output of solid-state 'Decoders' of the TRASER system, thus promising simplified static relay designs without input-current transformers and with more freedom from high-energy stray transients which interfere with present relay designs. EHV provides a chance for electronics to reduce costs and weights, eliminate oil, and greatly improve the protective signal accuracy.