A wave-recording type station area residual current detection terminal and early warning system

Abstract

The invention discloses a wave-recording type station area residual current detection terminal and an early warning system. The terminal includes a residual current detection sampling module, a signal op-amp module, an MCU control module, a metering unit module, a LoRa communication module, and an indication display unit module , an alarm unit module and a storage module. The present invention has voltage, current and residual current measurement functions, and can monitor the residual current of the device under test in real time. By comparing with the set value, an alarm is generated, uploaded to the cloud server through the wireless network and sent push to the user. At the same time, the system has a fault wave recording function, which records the voltage and residual current waveforms of the set period before and after the fault, providing a basis for fault type judgment. The LoRa wireless communication adopted in the present invention reduces the system level, optimizes the transmission mode, and the abnormal data upload breakpoint rate in the station area drops by more than 72.6%.

Description

technical field [0001] The invention belongs to the technical field of power electronics, and in particular relates to the detection technology of residual current in a station area. Background technique [0002] In low-voltage distribution lines, residual current (commonly known as leakage current) is the current leakage caused by insulation damage, irregular wiring, and unreasonable design. If there is a certain potential difference between the electrical casing and the live wire and the ground for some reason, leakage will occur. Leakage is a common fault in low-voltage power distribution networks. It is an important fault that affects the reliability and safety of power supply. Its occurrence affects the reliability of power supply. In severe cases, it endangers the personal safety of users. It is a type of fault that needs to be paid enough attention to. . [0003] The installation of leakage protectors is a common and effective measure to prevent leakage accidents. H...

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Problems solved by technology

[0003] The installation of leakage protectors is a common and effective measure to prevent leakage accidents. However, due to irregular design and implementation, and random connections by individuals, frequent leakage occurs, and the total leakage protection cannot be invested. Residents have experienced frequent electric shocks, resulting in results and impacts all bad

[0004] On the other hand, leakage protectors may malfunction or refuse to operate. For example, there are normal small leakage currents in the circuit, such as capacitive leakage currents from long wires to ground, high-power load disconnection or surge voltage caused by lightning. High-order harmonics caused by power electronic equipment may cause misoperation of leakage protectors, causing interruption of residents' power supply, affecting production and life and even causing losses

In addition, current leakage protectors either cannot provide leakage current values, or can only provide steady-state leakage current values, and cannot effectively monitor instantaneous faults such as personal electric shocks.

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