Temperature rise and condensation are two factors that influence the useful life of medium voltage switchgear. By monitoring these phenomena, maintenance operations can be better programmed and the lifespan of the device can be extended. In this investigation, a monitoring system for the temperature rise was developed, implemented and tested. The simple thermal model from the literature was studied through experimentation, which revealed a more complex behavior that needed to be taken into account when designing the dynamic temperature rise monitoring system. Through the use of simulations, we were able to rapidly iterate until we developed a system that is able to detect abnormal heating in different positions in the switchboard, taking into account the magnitude of the currents flowing in the circuits. With respect to the dew formation, we modeled the thermal behavior of the air mass inside the compartment, and then we defined experiments designed to create condensation in a controlled manner. After several iterations of tests, we successfully generated dew inside the busbar compartment. Temperature and humidity measurements of the compartment and the ambient were taken and then analyzed to quantify the variables that give rise to condensation. Surface subcooling and change in absolute humidity were found to be the most important parameter in regards to the formation of condensation.
La sovratemperatura e la condensa sono due fattori che influenzano la vita utile dei quadri di media tensione. Monitorando questi fenomeni, è possibile programmare meglio le operazioni di manutenzione e prolungare la durata di vita del dispositivo. In questa ricerca è stato sviluppato, implementato e testato un sistema di monitoraggio della sovratemperatura. Il semplice modello termico della letteratura è stato studiato attraverso prove sperimentali, che hanno rivelato comportamenti più complessi, di cui si deve tener conto nella progettazione del sistema di monitoraggio dinamico dell’aumento di temperatura. Attraverso l’uso di simulazioni e utilizzando metodi iterativi abbiamo realizzato un sistema in grado di rilevare un riscaldamento anomalo in diversi punti, tenendo conto del comportamento termico della massa d’aria all’interno del quadro. Abbiamo poi realizzato un sistema sperimentale per creare condensa in modo controllato. Anche in questo caso è stato utilizzato un metodo di progettazione iterativo, che ha permesso di generare la rugiada all’interno della cella sbarra in condizioni controllate. Le misure di temperatura e umidità del compartimento e dell’ambiente sono state effettuate e poi analizzate per quantificare le variabili che danno origine alla condensazione. Il sottoraffreddamento superficiale e la variazione dell’umidità assoluta sono risultati i parametri più importanti per quanto riguarda la formazione di condensa.
Development of a monitoring system for temperature rise and dew point in medium voltage switchgear
BOSCH BORNO, VICTOR DANIEL
2021/2022
Abstract
Temperature rise and condensation are two factors that influence the useful life of medium voltage switchgear. By monitoring these phenomena, maintenance operations can be better programmed and the lifespan of the device can be extended. In this investigation, a monitoring system for the temperature rise was developed, implemented and tested. The simple thermal model from the literature was studied through experimentation, which revealed a more complex behavior that needed to be taken into account when designing the dynamic temperature rise monitoring system. Through the use of simulations, we were able to rapidly iterate until we developed a system that is able to detect abnormal heating in different positions in the switchboard, taking into account the magnitude of the currents flowing in the circuits. With respect to the dew formation, we modeled the thermal behavior of the air mass inside the compartment, and then we defined experiments designed to create condensation in a controlled manner. After several iterations of tests, we successfully generated dew inside the busbar compartment. Temperature and humidity measurements of the compartment and the ambient were taken and then analyzed to quantify the variables that give rise to condensation. Surface subcooling and change in absolute humidity were found to be the most important parameter in regards to the formation of condensation.File | Dimensione | Formato | |
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Bosch_Executive_Summary.pdf
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Descrizione: Executive Summary - Victor Bosch
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Bosch_Thesis.pdf
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Descrizione: Thesis - Victor Bosch
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https://hdl.handle.net/10589/202733