Power supply system applied to power capacitor online monitoring system

Abstract

The invention discloses a power supply system applied to a power capacitor online monitoring system. The power supply system comprises a microwave energy transmitting device, a microwave energy receiving device, an energy storage device, a bidirectional charging and discharging circuit and a voltage-stabilizing circuit, wherein the microwave energy transmitting device and the microwave energy receiving device transmits energy through microwave signals, an output end of the microwave energy receiving device is connected with the energy storage device via the bidirectional charging and discharging circuit, and an output end of the bidirectional charging and discharging circuit is connected with a power supply end of the power capacitor online monitoring system via the voltage-stabilizing circuit. The power supply system is convenient in taking electricity, high in reliability and low in system power consumption, obtains milliwatt-to-watt level electric energy by means of a thin-film rectifying antenna array, stores the electric energy in a miniature graphene super-capacitor bank, outputs a stable voltage by means of the voltage-stabilizing circuit, and solves the signal power supply problem of the power capacitor online monitoring system.

Description

technical field [0001] The invention relates to the technical field of power systems, in particular to a power supply system applied to a power capacitor online monitoring system. Background technique [0002] Parallel power capacitor devices are widely used in power transmission and distribution systems as reactive power compensation equipment, which can effectively improve the power factor of the system and improve equipment utilization. However, the high-voltage shunt power capacitor is a full-load operating device with a large rated current. After long-term operation, the aging of the capacitive element is prone to occur and cause damage to the capacitor, and the capacitance value of the capacitor will change significantly. The online monitoring system for complete sets of capacitors can effectively monitor the operating status of power capacitors, and when a capacitor fails, it can also analyze and locate the cause of the failure. The substation capacitor online monito...

AI Technical Summary

Problems solved by technology

At present, there are three power supply methods used in the capacitor online monitoring system: 1) Mains power supply is used. Due to the large number of capacitor banks, a module is installed on each capacitor. If 220V power supply is used, there are many power supply cables and the construction is complicated. , affect the application prospect; 2) Using solar power supply, the cost is high, and it is greatly affected by weather changes. The battery must be replaced after 2 to 3 years of operation, and the maintenance cost is high; 3) Using CT energy harvesting for power supply, the installation is complicated and the creepage distance is short , which affects the safety of the capacitor bank, and the primary current of the capacitor jumps between 5 and 80A, with a wide range of changes. If the current of the CT power coil is too small, it cannot work normally.

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