VOLTAGE DIVIDED FOR MEASUREMENTS CONDUCTING AT COMMUTATION TESTS OF HIGH-VOLTAGE EQUIPMENT AND METHOD OF COMPENSATION OF INFLUENCE ON DIVISION RATIO OF GROUNDED VOLTAGE DIVIDER CAPACITANCE Russian patent published in 2005 - IPC

FIELD: electric engineering.

SUBSTANCE: voltage divided has high-voltage arm made of R-C-r units connected in series. Each unit has capacitor and low-ohmic damping resistor connected in series with and high-value resistor to shunt the connection. Low-voltage arm of the divided is split to two parts: low-voltage unit and companion unit, both connected together by coaxial cable. Low-voltage unit ha capacitor C₂ and low-ohmic resistor r₂; capacitor and resistor are both shunted by high-value resistor R₂. Companion unit has capacitor C₃ connected in parallel high-value resistor R₃. Resistor r₃ being equal to wave resistance of cable is connected in series with R₃. Capacitor C₃ is composed of two capacitors connected in parallel to meet the condition of C₃=C₃₀+ΔC₃. C₃₀ has constant value and ΔC₃ has to be adjustable capacitor. Method of compensation of influence of divider capacitance on division factor of divider is based on tuning of division ratio after the final position of diver among rest members of high-voltage testing circuit was found. Calibration voltage U₁ of any frequency is applied to divider, output voltage U₂ is calculated, division ratios are calculated and values of tuned capacitance are reduced till getting value at which value the division ration would correspond to its nominal meaning.

EFFECT: higher possibility of compensation of capacitance.

4 cl, 3 dwg