| 摘要 |
FIELD: measuring technique, namely quick-action monitoring of annihilation or sharp change of admissions of instantaneous values of sine voltage with formation of a respective signal. SUBSTANCE: pickup includes a source of reference voltage, whose amplitude does not depend upon a voltage, being tested, and whose phase differs from a phase of the voltage, being tested, by an angle, multiple to 180 degrees. The reference voltage source includes a comparator, operating with a time delay, a double integrator with limitation of an output voltage and a differentiating circuit; an amplifier of the reference voltage, calculating an instantaneous value of an admissible error; a first full-wave rectifier, calculating a modulus of the admissible error; a source of direct-current bias voltage; a second adder, calculating a sum of the modulus of the admissible error and the direct-current bias voltage; a first adder, calculating an instantaneous value of a real error between the voltage, being tested, and the reference voltage; a second full-wave rectifier, calculating a modulus of the real error; and a comparator for comparing the modulus of the real error and the sum of the modulus of the admissible error and the direct-current bias voltage. The pickup provides testing of admission of instantaneous values of alternative current voltage in any point of sine curve. EFFECT: enhanced accuracy and quick-action of testing process. |
