Electric arc detection method and device and heat storage type electric heating system

Abstract

The invention relates to the technical field of electrical control, in particular to an electric arc detection method and device and a heat storage type electric heating system. The arc detection method provided by the embodiment of the invention comprises the following steps: acquiring three-phase voltage and three-phase current of a heating device in real time; determining a three-phase correction voltage according to the three-phase voltage and a preset three-phase standard voltage, and determining a three-phase correction current according to the three-phase current and a preset three-phase standard current; determining a balance voltage between any two phases according to the three-phase correction voltage, and determining a balance current between any two phases according to the three-phase correction current; determining a value of a target phase judgment factor according to the correction voltage and the correction current of the target phase and the balance voltage and the balance current between the other two phases except the target phase; and judging whether the value of the judgment factor meets a preset value or not, and if YES, generating an alarm signal. Whether thedanger of arc generation exists or not is judged according to the value of the judgment factor, and the reliability is high.

Description

technical field [0001] The invention relates to the technical field of electrical control, in particular to an arc detection method, device, and heat storage type electric heating system. Background technique [0002] The heat storage type electric heating device uses electric energy to heat the heat storage medium, and is mainly used in heating, power plant peak regulation and other fields. Since the power grid load is mainly concentrated in the daytime, and the heating of the heat storage medium consumes a large amount of electric energy, the heat storage type electric heating device uses electric energy to store heat when the electricity consumption is low (such as at night), and when the electricity consumption peak (such as during the day) ) to release the accumulated heat to achieve heating. [0003] High-power thermal storage electric heating devices usually directly use high voltage of 10kV and above to supply power to the heating wire to reduce the investment cost ...

AI Technical Summary

Problems solved by technology

However, in this way, when the heating wire is disconnected due to some accident, an arc is likely to appear at the fracture of the heating wire, forming a local high temperature. If it is not found and dealt with in time, accidents will easily occur.

[0004] In the prior art, the monitoring of the broken wire of the heating wire adopts the method of simply detecting the voltage and current to calculate the resistance, or the method of using the computer comprehensive protection to monitor the electrical parameters to alarm. These methods are affected by the voltage fluctuation of the power grid and the deviation of the resistance value of the heating wire itself. , it is easy to make false positives or negative negatives; there are also methods of direct observation, but there is a large dead angle of observation, and it can only be found after the arc occurs, which will easily lead to further expansion of the fault and endanger the normal operation of the equipment

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