An Electrical Phase Prediction Device Based on Second-Order Derivative Algorithm

Abstract

The invention provides an electrical phase prediction device based on a second-order derivative algorithm, which belongs to the technical field of electrical comprehensive protection and aims to solve the problem of inaccurate switching of dual power supplies with small phase difference due to the action time of the actuator; the invention includes 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 functional additional module; the design in the present invention can realize the phase prediction function and perform the protection action in advance for the comprehensive protection. Data base; avoids the risk of power failure when switching between dual power sources without considering the actuation time of the actuator.

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 and low voltage complete sets of equipment, which are usually used in the synchronous capture function of incoming line switching to the bus voltage of the rotating load and the incoming line voltage to be switched when the rotating load is shut down, and When the monitoring system is running, whether there is asymmetric three-phase power load that causes damage to the power equipment. [0003] At present, the phase fault judgment of 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 ro...

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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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