Optical Fibre Monitoring Of Power Circuit Breakers
Abstract
The potential of optical fibre based sensing systems for monitoring physical and chemical conditions in difficult environments such as those with explosion hazards or those susceptible to electromagnetic interference is now well established (e.g. Parr et al (1987)). One such environment which is difficult to monitor fully with conventional electronic instrumentation is that of high voltage power transmission systems. Perhaps the component of such systems which imposes the most severe demands upon monitoring (and therefore is arguably the least well monitored in service) is the extra high voltage circuit breaker. The difficulties in fully monitoring these devices include the need to preserve high levels of electrical insulation (over 525 kV in the UK and higher in other parts of the world) and the need for immunity from strong magnetic fields and from severe electromagnetic interference during circuit breaker operation. A range of parameters need to be addressed which are not only electrical in nature but also thermal, mechanical, aerodynamic and chemical.
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