Method for detecting abnormality of urban power supply quickly

Abstract

The invention discloses a method and a device for detecting the abnormality of a mains supply quickly. The method comprises the following steps of: sending the mains supply to a sampling module for sampling by using the device, and rectifying so as to acquire an absolute value signal of voltage of the mains supply; sending the sampled signal of the mains supply to a data acquisition processor; acquiring the output signal of the sampling module and analyzing and judging the output signal by using the data acquisition processor; outputting a state signal of the mains supply to a logic executingmodule; and if the state signal of the mains supply is abnormal, giving an acoustooptical alarm and executing relevant operation by using the logic executing module. In the data processing method, whether the mains supply has overhigh voltage abnormality, overlow voltage abnormality, zero crossing abnormality, energy abnormality and amplitude abnormality is judged according to the features of thesine wave of the mains supply and the maximum utilization ratio of energy.

Description

technical field [0001] The invention relates to the technical field of electric power equipment, in particular to a method and device for quickly detecting abnormality of mains power. Background technique [0002] With the rapid development of information technology, UPS systems (uninterruptible power supply systems) are more and more widely used in finance, insurance, taxation, communications, national defense and other fields. The demand for uninterruptible power supplies in the , energy industry, etc. has shown a rapid growth momentum. Especially in the manufacturing industry, the large-scale rise of small and medium-sized enterprises has become a new source of power driving the growth of the uninterruptible power supply market. The development potential of uninterruptible power supplies is still very huge. In order to ensure the energy saving and high reliability of the uninterruptible power supply system as a backup power supply, the application of high-power UPS requi...

AI Technical Summary

Problems solved by technology

This method has the following disadvantages: the effective value of the mains power needs at least half a cycle to be calculated, so the abnormal detection time of the mains power must be longer than half the mains cycle

This method has the following disadvantages: 1. Since the mains waveform is a sine wave, it is difficult to set the upper and lower envelopes; 2. This method needs to know the frequency of the mains more accurately, but the measurement of the mains frequency is lagging behind. One cycle, one time when the mains frequency changes suddenly, there will be no detection, so this method cannot be applied in occasions where the mains frequency changes frequently

This method has the following deficiencies: 1. Since the mains waveform is a sine wave, it takes a long time to judge when the waveform crosses zero, which often cannot achieve the purpose of quick judgment

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