Capacitive high-voltage self-powered power supply and measurement integrated device

Abstract

The invention discloses a capacitive high-voltage self-power-taking power supply and measurement integrated device which comprises a high-voltage power-taking capacitor C. One end of the high-voltage power-taking capacitor C is connected with a high-voltage bus, and the other end of the high-voltage power-taking capacitor C is connected with a primary side winding of a transformer T. Low-voltage alternating current is obtained after voltage reduction of the transformer T. A low-voltage alternating current is subjected to AD conversion through an energy-taking control panel which is connected with a secondary side winding of the transformer T and has an ACDC conversion function to obtain 24V direct current, a high-voltage fuse is connected between the high-voltage electricity-taking capacitor C and the high-voltage bus, one end of a voltage-dividing capacitor C1 is connected between the high-voltage fuse and the high-voltage electricity-taking capacitor C, and the other end of the voltage-dividing capacitor C1 is connected with the other end of the voltage-dividing capacitor C1. The other end of the voltage dividing capacitor C1 is connected with one end of a voltage dividing capacitor C2, the other end of the voltage dividing capacitor C2 and the negative electrode of the primary side winding of the transformer T are grounded together, the voltage dividing capacitor C2 is connected with a low-voltage mutual inductor B in parallel, and the other end of the low-voltage mutual inductor B is connected with FTU equipment. By measuring the voltage value output by the voltage dividing capacitor C2, the phase voltage on the high-voltage bus can be obtained.

Description

technical field [0001] The invention relates to a self-feeding device, in particular to a capacitive high-voltage self-feeding power supply and measuring integrated device. Background technique [0002] With the continuous improvement of the grade and capacity of high-voltage transmission lines, the short-circuit current in the line is getting larger and larger, which makes the traditional electromagnetic voltage transformer prone to explosion and other safety accidents due to factors such as ferromagnetic resonance and magnetic saturation, which seriously affects the The normal and orderly operation of high-voltage lines also hinders the healthy and long-term development of smart grids, but the safe operation of measurement and protection devices is crucial to the safe production and stable operation of the entire power system. Therefore, for the field of energy harvesting on high-voltage side lines The research has important practical value; At present, the commonly used h...

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Problems solved by technology

[0002] With the continuous improvement of the grade and capacity of high-voltage transmission lines, the short-circuit current in the line is getting larger and larger, which makes the traditional electromagnetic voltage transformer prone to explosion and other safety accidents due to factors such as ferromagnetic resonance and magnetic saturation, which seriously affects the The normal and orderly operation of high-voltage lines also hinders the healthy and long-term development of smart grids, but the safe operation of measurement and protection devices is crucial to the safe production and stable operation of the entire power system. Therefore, for the field of energy harvesting on high-voltage side lines The research has important practical value; At present, the commonly used high-voltage online power supply methods are electromagnetic voltage transformer, current transformer, battery, laser and solar energy, etc., each has its own advantages and disadvantages

[0003] Moreover, the distribution network has many points, complex installation and commissioning of equipment, and difficult maintenance restrict the development of distribution network and the improvement of power supply reliability. The existing switches are basically complete sets of primary and secondary equipment, involving multiple manufacturers and multiple equipment. Interfaces often have problems such as inconsistent interfaces, no scalability, complicated installation and debugging, and difficult division of responsibilities; in addition, electromagnetic PTs are not easy to integrate, complex to install, and prone to ferromagnetic resonance

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