High Voltage Capacitive Voltage Divider

If the high voltage input resistance is high and the hv capacitance and ratio selected are low normal external and added load capacitance including coaxial cable and resistance of many display or recording devices can seriously affect the ratios.

High voltage capacitive voltage divider.

Pearson high voltage coaxial capacitive voltage dividers permit measurements up to 500kv when used in high voltage insulating oil. See the table below for model specifications. The capacitive voltage divider circuits are used in large electronics applications mainly used in capacitive sensitive screens those change their output voltage when it is touched by a person finger. A simplified schematic of the current comparator based voltage divider is shown in figure 1.

Capacitive divider probes are typically used for voltages above 100 kv as the heat caused by power losses in resistor divider. Capacitive voltage transformer working. The actual voltage divider ratio is determined by the following formula. So the capacitor with the smaller capacitance will have the greater voltage and conversely the capacitor with the greater.

Therefore voltage is inversely proportional to the capacitance value of the capacitor. In a capacitive voltage divider for measuring high voltage pulses with millisecond pulse duration comprising a high voltage divider including a first cascade of at least two serially arranged condensers of which one c 1 is disposed at the high potential end and another c 2 is disposed at the low potential end of the cascade and a measuring voltage divider connected to the other. The output voltage of the capacitive potential transformer is further step down by the help. An optional high voltage capacitor ranging from 1 000 pf 2 kv to 800 kv can be ordered to be used on the input of the divider.

Voltage is divided up in a capacitive dc voltage divider according to the formula v q c. And also used in transformers to increase voltage drop where generally the mains transformer contains low voltage drop chips and components. Customized division ratio and calibration for use in air are available. The capacitive potential divider is used in combination with the auxiliary transformer and the inductive element.

Capacitive voltage divider circuits are used in a variety of electronics applications ranging from colpitts oscillators to capacitive touch sensitive screens that change their output voltage when touched by a persons finger to being used as a cheap substitute for mains transformers in dropping high voltages such as in mains connected circuits.