Practical of string Insulator...Guard Ring...

practical of string insulators guard ring potential distribution in a string of suspension insulators is not uniform which results in a reduction in string efficiency. String efficiency can be improved using longer cross arms of transmission line poles, by grading the insulators, or by application of a guard ring. Given below is an overview of the role of the guard ring in improving string efficiency. The guard ring is a metal ring that is electrically connected to the conductor and surrounds the bottom insulator. A guard ring establishes capacitance between the conductor wire and metal fittings of the insulator. The figure below is an illustration of guard ring connected to a line. Where in above figure i1, i2 are shunt capacitance currents i′1, i′2 are line capacitance currents The guard ring is connected in a manner that shunt capacitance currents (i1, i2) are equal to metal fitting line capacitance currents i′1, i′2. Once guard ring is properly installed in place, the same charging current I flows through each unit of string by the virtue of which a uniform potential distribution across the units is achived. guard ring in transmission line, guard ring, guard ring in analog layout, guard ring capacitor, guard ring in vlsi, guard ring capacitor , guard ring pcb, guard ring latch up, guard ring clean, guard ring layout