High-voltage divider ROF

capacitor voltagedistribution

Resistive capacitive voltage dividers type ROF (RC divider) are used in high-voltage networks within the 72.5-550 kV range. They divide the primary voltage into a standardised, equivalent secondary voltage for meters, measuring and protection devices. The active part of the RC divider consists of capacitive and parallel connected resistive dividing elements. The length of the active part extends along the entire insulator length, which results in linear voltage distribution. Both elements are calibrated to each other and provide accurate transient voltage signals from the high-voltage side to the low-voltage side. The RC divider enables very high frequency bandwidth; even direct voltages (DC) can be measured. As the active part of the RC divider is hermetically sealed, an expansion bellow in the head section compensates volume changes of the oil due to temperature variations. The operating pressure will be visualised by monitoring unit. For voltage levels of 300 kV and higher, field distortions are avoided by using a corona ring around the head of the divider. The secondary elements, like adjustment and overvoltage protection components, are located in the terminal box together with the equivalent burden replications. The cover plate of the terminal box can be opened laterally. The connecting sockets for the measuring cables are located on the bottom side of the terminal box.