Electrical phase prediction device based on second derivative algorithm

Abstract

The invention provides an electrical phase prediction device based on a second derivative algorithm, belongs to the technical field of electrical comprehensive protection, and aims to solve the problem of inaccurate small-phase-difference dual-power-supply switching caused by action time of an actuating mechanism. The device comprises a power supply module, a signal processing module, a hardware zero-crossing module, a phase monitoring module, a data fusion module, a phase prediction module, a communication module and a function additional module. According to the design in the invention, a phase prediction function can be realized, and a data basis is provided for comprehensive protection to carry out protection actions in advance; and the risk of power failure during dual-power switchingdue to the fact that the action time of an executing mechanism is not considered can be avoided.

Description

technical field [0001] The invention relates to the technical field of electrical comprehensive protection, in particular to an electrical phase prediction device based on a second-order derivative algorithm. Background technique [0002] Phase and phase difference are extremely important electrical quantities in high-voltage and low-voltage complete sets of equipment, which are usually used in the synchronous capture function of the bus voltage of the rotating load and the incoming line voltage to be switched when the incoming line is switched when the rotating load is stopped, and When the monitoring system is running, whether there is asymmetrical three-phase power load that causes damage to electrical equipment. [0003] At present, the phase fault judgment of the comprehensive protection is based on the current phase detection equipment. The current phase detection equipment has a long phase detection time and harsh phase detection conditions. Especially in the applicat...

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Problems solved by technology

[0003] At present, the phase fault judgment of the comprehensive protection is based on the current phase detection equipment. The current phase detection equipment has a long phase detection time and harsh phase detection conditions. Especially in the application environment of rotating loads, the phase difference between the two power supplies is too large. Large switching will lead to power failure. Since the current actuator action time is not fixed, such as the switching time of vacuum circuit breaker 20ms-40ms, it is unreasonable to use real-time phase as data basis for switching under this condition and is risky

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