Wave recording type transformer area residual current detection terminal and early warning system

Abstract

The invention discloses a wave recording type transformer area residual current detection terminal and an early warning system, and the terminal comprises a residual current detection sampling module,a signal operational amplifier module, an MCU control module, a metering unit module, a LoRa communication module, an indication display unit module, an alarm unit module, and a storage module. The terminal has the functions of measuring voltage, current and residual current. The residual current condition of the tested equipment can be monitored in real time, an alarm is generated by comparing the residual current condition with a set value, and the alarm is uploaded to a cloud server through a wireless network and pushed to a user. Meanwhile, the system has a fault recording function, records voltage and residual current waveforms of a set period before and after a fault, and provides a basis for fault type judgment. According to the LoRa wireless communication adopted by the invention,the system hierarchy is reduced, the transmission mode is optimized, and the transformer area abnormal data uploading breakpoint rate is reduced 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...

AI Technical Summary

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.

Images