Line load and fault detection device and method

Abstract

The invention relates to a line load and fault detection device. The device mainly comprises a single-chip microcomputer, a sinusoidal signal generator, a sampling circuit, a multipath conversion circuit, an effective value conversion circuit, an A / D conversion circuit, a buzzer alarm device and a liquid crystal display; the single-chip microcomputer is connected with the buzzer alarm device, andthe liquid crystal display, and is also connected with the multipath conversion circuit; the multipath conversion circuit is connected with the sampling circuit and the effective value conversion circuit; the sampling circuit is connected with the sinusoidal signal generator; the effective value conversion circuit is connected with the A / D conversion circuit; and the A / D conversion circuit is connected with the single-chip microcomputer. The line load and fault detection device is capable of realizing real time detection of load voltage to determine load open-circuit and short-circuit faults and give an alarm, realize accurate automatic detection of resistance, capacitance and inductance values, and realize stable display; the relative error is smaller than 5%, and the measurement time isnot longer than 5s.

Description

technical field [0001] The invention belongs to the technical field of power grid line monitoring, and relates to a line load and fault detection device based on the intelligent control of a single-chip microcomputer, which is especially used in low-voltage and medium-voltage regulated source circuits. Sampling circuit composed of rectification effective value conversion module, PCF8591A / D analog-to-digital conversion module and STC8952RC single-chip microcomputer, etc. The technical fields involved are mainly single-chip control technology, digital power, analog power processing technology, etc. Background technique [0002] At present, domestic fault indicators need to undergo strict verification before they can point out the location of the fault for maintenance personnel, so that the power supply of the non-faulty section can be restored in time, and in order to save a lot of working time and reduce the time and scope of power outages, there is no special line fault detec...

AI Technical Summary

Problems solved by technology

[0002] At present, domestic fault indicators need to undergo strict verification before they can point out the location of the fault for maintenance personnel, so that the power supply of the non-faulty section can be restored in time, and in order to save a lot of working time and reduce the time and scope of power outages, there is no special line fault detection. The device generally only detects whether the fault indicator is good or bad by controlling the on-off of the 220V or 380V line and the size of the load. It is impossible to test the specific value of the fault detector, how long the action lasts and other detailed indicators, and only Can be operated manually

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