FIELD: measuring equipment.
SUBSTANCE: device of the analog sensor of the reactive component of the alternating current relates to measuring equipment and can be used as a reactive component of an alternating current for automatic or manual control of the reactive power of the load unit of the power supply system. Signal at the sensor output can be used as feedback for automatic control, it must be proportional to the reactive component of the alternating current, positive for inductive and negative for capacitive nature of the load. Primary sensors are the intermediate current transformer and the voltage transformer of one phase of the network. In the current channel, the voltage proportional to the current downstream of the low-pass and high-pass frequency filters by means of a comparator and a sawtooth voltage generator, is converted into short pulses that are sent to the base of a bipolar transistor controlling optocouplers, connected in parallel, which, in the open state, shunt the feedback loop of the pulse-phase converter made on the operational amplifier, while the feedback circuit is not shunted on a short time interval for measuring the sinus of the phase angle between current and voltage. In the voltage channel, the reference voltage of the sinusoidal shape is formed, which is fed to the input of the phase shifter, from which the voltage is applied to the input of the pulse-phase converter, at the output of which a signal proportional to the sinus of the shear angle between voltage and current in the form of short pulses is obtained, this signal is filtered and fed to the input of a multiplier chip. Second input of this chip is fed with rectified and filtered voltage proportional to the current of the measured network.
EFFECT: as a result of multiplication, a voltage proportional to the reactive component of the current is obtained, and the output voltage can be either positive or negative, and no additional amplification of the output voltage is required.
1 cl, 12 dwg
