System for measuring temperature in thyristor in real time

A technology of real-time measurement and thyristor, applied in thermometers, measuring devices, measuring heat, etc., can solve problems such as blank measurement methods, and achieve the effects of fast demodulation speed, high reliability, and good linearity

Active Publication Date: 2011-08-31
CHINA ELECTRIC POWER RES INST +1
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

Therefore, there is an urgent need for a measurement system that can measure the real-time temperature in t

Method used

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  • System for measuring temperature in thyristor in real time
  • System for measuring temperature in thyristor in real time
  • System for measuring temperature in thyristor in real time

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Embodiment Construction

[0023] The measuring system of the present invention will be further described in detail below in conjunction with the accompanying drawings.

[0024] The thyristor converter valve is the core component of the system operation. The junction temperature of the thyristor changes with the external working conditions. The series voltage equalization mechanism of the converter valve, internal and external overvoltage, overcurrent, thyristor reverse recovery process, trigger control system, protection system, etc. All aspects of characteristics play a decisive role. Such as figure 1 As shown, the measurement system of the present invention is mainly composed of a fiber grating temperature sensor 5 located in the thyristor, a demodulator 9 and a background computer 10. In the figure, the capacitor and resistor connected to the thyristor form a thyristor assembly together with the thyristor. The fiber Bragg grating temperature sensor 5 is connected to the demodulator 9 through the mu...

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Abstract

The invention relates to a system for measuring the temperature in a thyristor in real time. The system comprises a fiber grating temperature sensor, wherein the fiber grating temperature sensor adopts a fiber made of quartz glass; gratings are etched on the fiber; each grating serves as a measuring point of the measuring system, and the temperature distribution of a thyristor molybdenum sheet layer is realized by using a plurality of gratings; a molybdenum sheet of the thyristor is provided with an open groove for accommodating the fiber; a porcelain ring of the thyristor is provided with an opening; the fiber passes through the opening, and is then connected with a demodulator through a multi-mode fiber; the demodulator is used for demodulating the reflection wavelength of reflected light transmitted by the fiber grating temperature sensor into a temperature signal to obtain real-time information of the temperature in a thyristor copper shell; and the demodulator is used for transmitting demodulated data to a background computer through a cable. The measuring system has the advantages of high stability, high reliability, high stability, high linearity, small errors and the like, the measuring range is between 40 DEG C below zero and 310 DEG C, the maximum error is 1.68 percent, and the testing requirements of various thyristor converter valves can be met.

Description

technical field [0001] The invention belongs to the field of power electronic systems, and in particular relates to a real-time temperature measurement system in a thyristor shell. Background technique [0002] Since its birth in 1956, thyristors have been developing in the direction of high voltage and high current. They are divided into Electrically Triggered Thyristor (ETT) and Light-Triggered Thyristor (LTT), which are widely used in HVDC, SVC, TCSC, TSC and other fields. The thyristor converter valve is the core component of the system operation. During the opening process, if it is subjected to a fault (surge) current, the current rise rate is very large, but the increase in the expansion speed of single crystal silicon is not obvious and uneven. Therefore, It will form a high current density in the conduction part and cause a sharp rise in the local junction temperature, which will eventually cause the thyristor to burn out; during the conduction process, there may b...

Claims

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Application Information

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IPC IPC(8): G01K11/32G01K11/3206
Inventor 张春雨王华锋李成榕
Owner CHINA ELECTRIC POWER RES INST
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