An arc detection method, device, and regenerative electric heating system

Abstract

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. The arc detection method provided by the embodiment of the present invention includes the following steps: collecting the three-phase voltage and the three-phase current of the heating device in real time; determining the three-phase correction voltage according to the three-phase voltage and the preset three-phase standard voltage; The current and the preset three-phase standard current determine the three-phase correction current; determine the balance voltage between any two phases according to the three-phase correction voltage, and determine the balance current between any two phases according to the three-phase correction current; The correction voltage and correction current of the target phase, the balance voltage and balance current between the remaining two phases other than the target phase determine the value of the determination factor of the target phase; determine whether the value of the determination factor satisfies the preset value, if If met, an alarm signal is generated. The present invention judges whether there is a danger of electric arc through the value of the judgment factor, and has high reliability.

Description

technical field [0001] The invention relates to the technical field of electrical control, in particular to an arc detection method, a device, and a regenerative electric heating system. Background technique [0002] The regenerative 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 grid load is mainly concentrated in the daytime, and the heating of the heat storage medium needs to consume a large amount of electric energy, the regenerative electric heating device uses electric energy to store heat when the electricity consumption is low (such as at night), and when the electricity consumption peaks (such as during the day) ) to release the accumulated heat for heating. [0003] High-power regenerative electric heating devices usually directly use high voltages of 10kV and above to supply power to the heating wire to reduce the investment cost of power equipmen...

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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