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Anti-interference RTD measurement loop

A technology for measuring circuits and terminal blocks, which is applied to measuring devices, measuring heat, and thermometers using directly heat-sensitive electric/magnetic components, etc., can solve problems such as stator bar RTD signal interference, and achieve measurement accuracy , the effect of reducing the number of uses

Inactive Publication Date: 2020-06-16
STATE GRID CORP OF CHINA +2
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to provide an anti-interference RTD measurement circuit, which effectively solves the problem that the RTD signal of the stator bar in the low speed range of the unit is interfered

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Embodiment Construction

[0011] The technical solution of the present invention will be specifically described below in conjunction with the accompanying drawings.

[0012] The invention provides an anti-interference RTD measurement circuit, including stator bar RTD, RTD transfer joint, temperature measurement terminal box, monitoring terminal block, monitoring AI module, stator bar RTD adopts three-wire connection method, stator bar RTD is connected through The RTD transfer connector, temperature measurement terminal box, and monitoring terminal block are connected to the monitoring AI module. The RTD transfer connector, temperature measurement terminal box, and anti-interference single-ended grounding are connected. Points C and B of the monitoring terminal block are short-circuited, and A Point and point B are connected through a filter capacitor, where point C is the power terminal of the monitoring terminal block, which is connected to the power supply of the monitoring AI module, and point B is t...

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Abstract

The invention relates to an anti-interference RTD measurement loop. The device comprises a stator bar RTD, an RTD transfer joint, a temperature measurement terminal box, a monitoring terminal strip and a monitoring AI module. The stator bar RTD adopts a three-wire system connection method, and a stator bar RTD is connected with a monitoring AI module through an RTD transit joint, the temperature measurement terminal box and the monitoring terminal strip. The RTD transit joint, the temperature measurement terminal box and an anti-interference single-ended ground are also arranged, wherein a point C and a point B of the monitoring terminal strip are short-circuited; the point A and the point B are connected through a filter capacitor; the point C is a power supply terminal of the monitoringterminal strip and is connected with a power supply of the monitoring AI module, the point B is a terminal to which the monitoring terminal strip and an R3 bridge arm of the monitoring AI module are connected, and the point A is a third terminal to which the monitoring terminal strip and the monitoring AI module are connected. According to the invention, the problem that the RTD signal of the stator bar in the low-rotating-speed section of the unit is interfered is effectively solved.

Description

technical field [0001] The invention relates to an anti-jamming RTD measuring circuit. Background technique [0002] The pumped storage power plant unit has the functions of power generation / pumping bidirectional operation and start-up at any time, and the stator bar RTD installed between the generator / motor stator bars is an important monitoring component of the power generation / motor. When the unit starts at low speed in the direction of pumping water and runs at low speed with electric braking in the direction of power generation, the rated no-load excitation current is applied to the rotor, and low-frequency alternating harmonics are induced on the stator. If the harmonics are superimposed on the RTD temperature measurement circuit, The RTD signal of the stator bar will vibrate violently due to the influence of electromagnetic interference in the wind tunnel, which will affect the RTD temperature measurement results. In order to solve this phenomenon, the inventor of th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01K7/21
CPCG01K7/21
Inventor 郑宏用周旭磊庄坚菱余睿林国庆胡海虹张斌卓颖异
Owner STATE GRID CORP OF CHINA
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