FIELD: electricity.
SUBSTANCE: storage capacitor is used in a device as a load, and its intermitting charge at negative half-periods of the supply mains is made from a stepping up high-frequency autotransformer with a high-voltage high-power diode. At that the autotransformer is connected to the supply mains downstream of the surveyed induction electricity meter through an in-series power transistor and the high-power diode, which passes current only when negative half-periods of the supply voltage occur. Current rate switching for the storage capacitor by the power transistor is made by delivery to its base-emitter junction of a periodical sequence of pulse signals from the generator with an adjusted oscillation frequency, for example, in the range of 1-5kHz, with a power amplifier, while smooth in time discharge of the storage capacitor back to the supply mains is made during positive half-periods of the supply voltage through a thyristor switched on at the beginning of positive half-periods of the supply voltage and an in-series connected inductance coil, which L value is matched to the C value of a capacity as per the formula (L·C)1/2≈10-2 s.
EFFECT: possibility to install the rate of load current interruption, at which the electricity meter of an inductance type has the worst error in correct metering of consumed power.
1 dwg
