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Guidance is offered on the application and use of optical voltage and current sensor systems for protective relaying, covering the selection, installation, testing, and operation of sensors. Information is provided on optical voltage and current-sensing technologies, and a number of performance parameters including: accuracy, bandwidth, noise, stability, and impact of temperature and vibration. Also covered are interface requirements of optical sensor systems, a number of their applications, relevant installation and commissioning, testing, reliability, and redundancy matters, as well as a comprehensive treatment of the relevant industry standards.
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The standards in this section apply to the following kinds of indicating electrical instruments for direct current and for alternating current: (1) ammeters (2) voltmeters (3) wattmeters (4) reactive volt-ampere meters (5) frequency meters (6) power-factor, reactive-factor and phase-angle meters (7) synchroscopes. These standards are not intended to apply to indicating instruments provided with arrangements for curve drawing, contact making, etc. They do not apply to the following kinds of instruments: (a) small instruments of types and sizes which are used where low cost is essential; for example, small polarized-vane ammeters used on automobiles, battery-charging outfits, etc. (b) instruments constructed for very special requirements.
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