| 摘要 |
FIELD: measurement technology. SUBSTANCE: proposed meter can be used to measure active electric energy in A.C. multiphase networks. It includes first multiplexer 1 which n inputs are connected to voltage terminals and to inputs of clock pulse former, second multiplexer which n inputs are coupled to input current terminals. Outputs of multiplexers are correspondingly connected to first and second inputs of analog multiplier which output is linked to first input of voltage-to-frequency converter. The latter is manufactured in the form of controlled inverter, integrator, hysteresis comparator connected in series. Output of comparator is output of voltage-to- frequency converter and is connected to first input of logic OR-ELSE gate which second input is second input of voltage-to-frequency converter and its output is linked to controlling input of controlled inverter. Output of analog multiplier is coupled to input of low-frequency filter which output is connected to input of zero level comparator. The latter is linked to second input of voltage-to-frequency converter and to first input of information processing unit which second input is connected to output of voltage-to- frequency converter. Input of control unit is coupled to output of clock pulse former and its output is linked to controlling inputs of first and second multiplexers. EFFECT: increased precision of measurement of electric energy in A C multiphase networks with preservation of capability for realization of various algorithms of metering of its direction. |
