Maintaining and monitoring subsea electrical networks can be a costly and time-consuming task. Several different topside devices are used to support these networks including electrical power modules, controller modules and monitoring devices. Line integrity monitoring (LIM) devices are installed to check the integrity of cable insulation through the measurement of insulation resistance (IR). Using lower voltages than Megohmmeters, measurements have a lower accuracy but offer the advantage of providing a continual picture through which the operator can see any developing trends that may alert them to a potential problem.
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