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Optical sensors for electrical elements of a medium voltage distribution network

pubblicazioni - Memoria

Optical sensors for electrical elements of a medium voltage distribution network

In questa memoria sono illustrati i risultati dell¿applicazione di due diverse tipologie di sensori ottici per la diagnostica di componenti elettrici di media tensione. In particolare si descrivono le modifiche apportate al sistema multi sensore per il monitoraggio di fenomeni di prescarica per consentirne un efficace e pratico utilizzo in ambiente industriale. Come secondo esempio si riportano i risultati di una prima sperimentazione di un prototipo ottico per misure di caratterizzazione dinamica di trasformatori MT/bt per individuare parametri caratteristici correlati ad un invecchiamento precoce della macchina.

The aging of most of the components of the National transmission and distribution system can potentially influence the reliability of power supply in a Medium Voltage (MV) network. In order to prevent possible dangerous situations, selected diagnostic indicators on electrical parts exploiting reliable and potentially low-cost sensors are required. This paper presents results concerning two main research activities regarding the development and application of innovative optical sensors for the diagnostic of MV electrical components. The first concerns a multi-sensor prototype for the detection of pre-discharges in MV switchboards: it is the combination of three different types of sensors operating simultaneously to detect incipient failure and to reduce the occurrence of false alarms. The system is real-time controlled by an embedded computer through a LabView interface. The second activity refers to a diagnostic tool to provide significant real-time information about early aging of MV/Low Voltage (LV) transformers by means of its vibration fingerprint. A miniaturized Optical Micro-Electro-Mechanical System (MEMS) based unit has been assembled for vibration measurements, wireless connected to a remote computer and controlled via LabView interface. Preliminary comparative tests were carried out with standard piezoelectric accelerometers on a conventional MV/LV test transformer under open circuit and in short-circuited configuration.

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