Method and a device for voltage measurement in a high-voltage conductor

Measuring equipment for forming a measured value for voltage representing an ac voltage on a high-voltage conductor, said measuring equipment comprising capacitor equipment with a known capacitance for connection between the high-voltage conductor and ground potential, wherein the capacitor equipment is in the form of a coupling capacitor with an external voltage terminal, wherein the capacitor equipment is arranged in a support insulator, wherein the measuring equipment comprises a screen of an electrically conductive material surrounding said external voltage terminal, and wherein said electrically conductive screen is electrically conductively connected to the casing of the support insulator and wherein the measuring equipment further comprises current-measuring means for sensing a capacitor current flowing through the capacitor equipment and for forming the measured value for voltage in dependence on said capacitor current.