Transformer Solutions - Temperature Nortech Pavica0 pages

"NORTECH PAVICA Transmission Line Vibration Recorder and Analyzer nn

Key Features

Based on internationally accepted IEEE and CIGRE methods May be mounted directly on conductors (live or not) at suspension, spacer or damper clamps Ideal to use on lines fi tted with cushioned attachment devices Comes with a specifi c software for fast and easy confi guration and data retrieval Analyses collected vibration data in real time and provides built-in calculation of nominal conductor life expectancy High-resolution frequency and amplitude matrix (64 64) with user-programmable frequency and amplitude scales >

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The Nortech Pavica is a unique, small, lightweight instrument used to monitor and analyse vibrations in overhead transmission lines.

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The Nortech Pavica measures the frequency and amplitude of all vibration cycles over all sampling periods, stores the data in a high-defi nition matrix and pro-cesses the results to provide a rough estimate of the life expectancy of conduc-
tors under study. These measurements and evaluation methods are based on the IEEE Standard on conductor vibration measurement and the CIGRE procedure for estimation of lifetime.The Nortech Pavica can be set directly onto the conductor in the vicinity of any type of clamp as opposed to other clamp-mounted commercial recorders, which are limited to metal-to-metal suspension clamps. The instrument consists of a gauged cantilever beam sensor, fastened to a clamp, which supports a short cy-
lindrical housing. A feeler in contact with the conductor transmits motion to the sensor. The hous-ing contains a microprocessor, an electronic circuitry, a power supply, a display and a temperature sensor.This device combines the wide experience of Hydro-Quשbecs (IREQ) researchers in the fi eld of conductor vibrations and the latest technology offered by FISO engineers in the fi eld of on-site measurements.

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Applications

Evaluates the in-situ vibration response of different line designs, tensions and hardware Estimates the nominal life expectancy of classical conductors subject to aeolian vibrations Rapidly identifi es sites with potential line vibration problems Supports the proper selection and positioning of anti-vibration devices such as Stockbridge dampers and spacers-dampers Helps in drawing up realistic maintenance and refurbishment programs >

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Installation

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The Nortech Pavica may be installed on all types of conductors, under live or non-energized line conditions. The instrument is mounted directly onto the con-
ductor. This greatly facilitates the installation and allows the instrument to be mounted not only at metal-to-metal suspension clamps, but also at cushioned supporting units and other damper and spacer attachment devices. Whenever the conductorҒs diameter is small, the recorder mass may interfere with the mea-
surements. If such is the case, it may be required to use the split version of the recorder, whereby only the sensor is mounted onto the conductor, while the housing is mounted on a nearby fi xed-line component.

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