High-reliability adaptive sampling circuit for key phase pulses

Abstract

The invention relates to a high-reliability adaptive sampling circuit for key phase pulses, and belongs to the technical field of power system real-time measurement. The high-reliability adaptive sampling circuit for the key phase pulses comprises a first A / D sampling module, an amplitude attenuation module, a comparison module and a processor, wherein the first A / D sampling module is connected with the processor, the amplitude attenuation module is connected with the processor through the comparison module, the processor is used for calculating an amplitude attenuation coefficient and a comparison threshold according to a key phase pulse collected by the first A / D sampling module, the amplitude attenuation module is used for receiving the attenuation coefficient transmitted by the processor and attenuating the amplitude of the key phase pulse according to the attenuation coefficient, and the comparison module is used for comparing the comparison threshold fed back by the processor with the amplitude attenuated key phase pulse and outputting a level signal capable of being directly collected by the processor. The adaptive sampling circuit can adapt to diversified pulses in the field, reduce the labor consumption and improve the intelligent degree; and meanwhile, the adaptive sampling circuit can performs self-checking on the threshold reference voltage of a comparator timely, thereby improving the reliability of the system.

Description

technical field [0001] The invention relates to a highly reliable key-phase pulse self-adaptive sampling circuit, which belongs to the technical field of real-time measurement of power systems. Background technique [0002] Generator power angle is an important record data of grid disturbance, oscillation and instability trajectory, and one of the important state indicators reflecting the stability of power system. Therefore, it is of great significance to study a highly reliable generator power angle measurement circuit. [0003] At present, the power angle of the generator is obtained by measuring the key phase sensor, and the key phase measurement is by setting a groove 2 on the measured shaft, called the key phase mark, such as figure 1 As shown, when the groove 2 turns to the position of the probe, it is equivalent to the change of the distance between the probe and the surface to be measured. The sensor 1 will generate a pulse signal. Every time the shaft rotates, a pu...

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Problems solved by technology

[0007] The purpose of the present invention is to provide a highly reliable key-phase pulse adaptive sampling circuit, which is used to solve the problems that the existing key-phase pulse acquisition circuit cannot identify the pulse amplitude, needs manual configuration, and has poor self-adaptive ability

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