Abstract—In order to understand the aspects of online bushing monitoring, it would be good to discuss what is power factor and capacitance, typical construction of a bushing and typical offline testing theory. This will allow for comparisons to be made between the methods and technology.
Keywords—online monitoring, bushings, testing, utilities, capacitance, power factor, current
I. INTRODUCTION
The purpose of the capacitive layers allows for the energized center conductor to penetrate the ground plan. By having equal capacitances, the voltage is stressed equally across each layer.
There are two major capacitances in a bushing C1 and C2. These are shown in Figure 2. The C1 capacitance is the capacitance between the center conductor and the tap. The tap is usually connected to the outer most foil and in some cases to the second to last foil. The C2 capacitance is the capacitance from the tap to ground. Typically, the tap is grounded, therefore the C2 capacitance is not in the circuit during normal operation.
By: Claude Kane Dynamic Ratings, Product Line Manager
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