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Pt100 signal conversion device for thunder-strike resisting electric transformer

A technology for signal conversion devices and power transformers, applied in the direction of adopting electrical devices, measuring devices, instruments, etc., can solve problems such as poor linearity, achieve good stability, shorten fault maintenance time, and strong anti-interference ability

Active Publication Date: 2013-08-07
SHANDONG DACHI ELECTRIC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] It can be seen from the above formula that the resistance value of the Pt100 temperature sensor increases with the increase of temperature, showing an approximately linear relationship, but not an absolute linear relationship, and the higher the temperature, the worse the linearity

Method used

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  • Pt100 signal conversion device for thunder-strike resisting electric transformer

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Embodiment Construction

[0024] Accompanying drawing is a kind of specific embodiment of the present invention. This embodiment includes the line connecting the Pt100 temperature sensor 2 in the power transformer 1, the lightning protection circuit and the Pt100 temperature acquisition circuit 4 are installed on the line, the Pt100 temperature acquisition circuit 4 and the nonlinear compensation circuit 5 communicate with each other, and the nonlinear compensation circuit 5 The 4~20mA current generation circuit 6 is connected, and the AC-DC power supply circuit 7 is respectively connected with the nonlinear compensation circuit 5 and the 4~20mA current generation circuit 6; the lightning protection circuit includes a sensor access channel lightning protection connected to the Pt100 temperature acquisition circuit 4 Circuit 3, three parts: 4~20mA output channel lightning protection circuit 8 connected to 4~20mA current generating circuit 6 and 220V AC input channel lightning protection circuit 9 connect...

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Abstract

The invention belongs to the temperature detection field of an electric transformer, and particularly discloses a Pt100 signal conversion device for a thunder-strike resisting electric transformer. The signal conversion device comprises a circuit for being connected with a Pt100 temperature sensor in the electric transformer and is characterized in that a thunder protective circuit and a Pt100 temperature acquisition circuit are mounted on the circuit, the Pt100 temperature acquisition circuit and a non-linear compensation circuit are mutually communicated, the non-linear compensation circuit is communicated with a 4-20mA current generating circuit, an AC-DC (alternating current-direct current) power supply circuit is respectively communicated with the non-linear compensation circuit and the 4-20mA current generating circuit. The device is strong in interference resistance, multiple thunder protective measures are adopted inside the device, so that sensing thunder waves from a signal line and a power supply line can be inhibited, and the function of thunder impact self-recovery is provided.

Description

(1) Technical field [0001] The invention belongs to the field of temperature detection of power transformers, in particular to a Pt100 signal conversion device for lightning-resistant power transformers. (2) Background technology [0002] Equipped with a temperature detection device for power transformers, it can effectively prevent accidents caused by excessive temperature of the transformer, and at the same time promote the scientific management of the use of the transformer, thereby effectively prolonging the service life of the transformer. At present, most of the temperature detection sensors of power transformers use Pt100 platinum resistance temperature sensors. The resistance value of platinum metal changes with temperature, and has good reproducibility and stability. The sensor made of this physical property of platinum is called platinum resistance temperature sensor. The commonly used platinum resistance temperature sensor has zero resistance The value is 100...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01K7/21
Inventor 陈玉国田卫东疏月霞陈瑞
Owner SHANDONG DACHI ELECTRIC
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