FIELD: electricity.
SUBSTANCE: invention can be used for testing single-phase induction and digital electricity meters, in particular when checking the counting error of consumed electricity when the operating current is interrupted at an increased frequency many times higher than the frequency of the power supply network. A bridge device for checking electricity meters of active energy is claimed, comprising transistors switching the charge current of two identical storage capacitors of capacitance C each, controlled from a modulated high-frequency pulse generator arranged in a bridge circuit, the first and the second branches of which are connected in parallel to the power network and include a storage capacitor and a bi-directional transistor switch from two identical transistors connected in antiparallel, sequentially installed. The first branch of the bridge circuit is connected by the storage capacitor to the null conductor of the network via the bi-directional transistor switch, and the second branch - by the storage capacitor to the phase conductor of the network via a similar bi-directional transistor switch, and a controlled triac (bi-directional thyristor) is included in the diagonal of the bridge circuit. The operation of the four transistors and triac is controlled from the electronic control unit synchronized by the network voltage, characterized in that a low impedance throttle connected in parallel to a coupling capacitor with a voltage coil of a meter to be checked are connected in series relative to the triac into the diagonal circuit of the bridge circuit. The throttle inductance L is chosen by the condition fO=1/4π(LC/2)1/2, and the capacitance of the coupling capacitor CCB is chosen by the condition fO=1/4π(LVC CCB)1/2, where LVC is the inductance of the voltage coil of the electricity meter to be checked, fO - the network frequency (50 Hz). The inequalities C>>CCB and LVC>>L are observed, according to which CCB≈LC/2LVC. It is the possibility of uncontrolled use such devices by the consumer that determines the need for the development of new energy metering devices that are not sensitive to the interruption of the load current. Such metering devices should displace the park of electricity metering devices existing in the country, freeing the country's economy from uncontrolled theft of electricity in colossal amounts for many hundreds of billions of roubles of annual losses.
EFFECT: increasing the work efficiency on winding down or slowing down the rate of accounting for consumed electricity.
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