Compensating capacitors K78-99 are used to adjust the power factor of electromagnetic throttles of gas-discharge lamps and transformers in electrical networks with a frequency of 50-60Hz

The principle of operation of gas-discharge lamps is based on the maintenance of an electric arc, which causes an inert gas to glow. This type of load has a large inductance, resulting in increased current consumption. To reduce current consumption, as well as increase the power factor of lighting equipment in the circuit must be added to the capacitor. The use of the capacitor allows to increase the cos power factor (φ) to a value of 0.96.

Recommendations for choosing the type of compensating capacitors for lighting

There are two types of connection of gas-discharge lamps.

  1. Connecting the capacitor in parallel to the power supply (Fig. 1). This type of connection is the most commonly used by lighting manufacturers.
  2. Connecting the capacitor in series to the power supply (Fig. 2). This connection option has its advantages and disadvantages. The advantage is that in this case there is no flickering light effect. The disadvantage is that the capacitor is subjected to a high load, due to the resonance between the throttle and the capacitor. Therefore, capacitors for this type of compensation are made at a rated voltage of 450V.