Ultra-high voltage direct current voltage transformer

Abstract

The invention relates to an ultra-high voltage direct current voltage transformer, including a base, a voltage divider, an insulator, a cover plate and fluorescent optical fiber temperature measuring equipment. The voltage divider is arranged in an airtight gas chamber surrounded by the base at the lower end, the insulator in the middle, and the cover plate at the upper end, and the airtight gas chamber is filled with SF gas; the fluorescent optical fiber temperature measuring equipment includes fluorescent optical fiber temperature sensors, an adapter optical fiber, a fluorescent optical fiber temperature measuring instrument, an optical fiber converter and a PC; and the fluorescent optical fiber temperature sensors are uniformly fixed on the voltage divider along a height direction of the voltage divider, and are connected with the adapter optical fiber through a through device fixed on the base in a sealed manner. The temperature of the voltage divider in the airtight gas chamber is monitored in real time through the fluorescent optical fiber temperature measuring equipment that is arranged, and temperature inside the direct current voltage transformer is detected; and in cooperation with the fluorescent optical fiber temperature sensors uniformly fixed on the voltage divider, temperature monitoring can be performed comprehensively and reliably, and the entire temperature monitoring adopts optical signal transmission, and is not affected by high voltage and strong electromagnetic interference.

Description

technical field [0001] The invention belongs to the field of high-voltage power transmission equipment, and relates to an ultra-high voltage DC voltage transformer. Background technique [0002] DC transmission shows more advantages than AC in high-power ultra-high voltage long-distance transmission, cable transmission, and asynchronous networking. DC voltage transformers, as pole-line voltage measurement devices, are essential equipment in DC transmission. The DC voltage transformer adopts the principle of resistance-capacitance voltage division to obtain a small voltage signal. The voltage division unit is a voltage divider. The voltage divider is composed of a large number of resistors and capacitors. The resistors and capacitors have high enough thermal stability. Since the power of a single resistor and capacitor is constant, with the increase of the transmission voltage level, the number of resistors and capacitors that make up the voltage divider increases. When the ...

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Problems solved by technology

The internal temperature of the existing monitoring voltage transformer is obtained by the thermal simulation method during the operation process, and there are problems such as large temperature simulation error and inability to monitor in real time

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