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Test method for static performance of tachometer with critical interruption

A technology of emergency blocking and detection methods, which is applied in the direction of speed/acceleration/shock measurement, testing/calibration of speed/acceleration/shock measuring equipment, measuring devices, etc. question

Active Publication Date: 2016-04-13
HARBIN TURBINE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The present invention is to solve the problem that the critical blocking tachometer cannot be detected and lacks a detection method, and further provides a static performance detection method of the critical blocking tachometer

Method used

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  • Test method for static performance of tachometer with critical interruption
  • Test method for static performance of tachometer with critical interruption
  • Test method for static performance of tachometer with critical interruption

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specific Embodiment approach 1

[0041] Specific implementation mode one: the following combination figure 1 Describe this embodiment, the method for the static inspection of a crisis blocking tachometer described in this embodiment, the detection method includes a detection method for accurate speed detection, and the method includes the following steps:

[0042] After preheating the checked critical breaking tachometer, standard frequency source and counter for half an hour, use the standard frequency source to simulate the output speed signal of the steam turbine in normal operation, and output the speed signal to the speed signal input of the checked critical breaking tachometer terminal; adjust the standard frequency source to output 10 different speed signals respectively. The speed values ​​of the 10 different speed signals are all within the normal operating speed range of the steam turbine. After each speed signal is output, read the checked critical blocking tachometer The speed display value, and t...

specific Embodiment approach 2

[0049] Specific embodiment 2: This embodiment further limits the method of crisis blocking tachometer static verification described in specific embodiment 1. In this embodiment, among the 10 different speed signals, five are less than 3300r / min, The other five are greater than 3300r / min.

specific Embodiment approach 3

[0050] Specific Embodiment 3: This embodiment further limits the method for the static detection of the emergency tachometer described in the specific embodiment 1. In this embodiment, the method for critically blocking the static detection of the tachometer also includes the time base stability Detection method, described method comprises:

[0051] Using a standard frequency source to simulate the normal operation of the steam turbine is to output a fixed speed signal f 0 , and output the rotational speed signal to the speed signal input terminal of the checked critical tripping tachometer, and then read the speed display value of the checked critical tripping tachometer every half hour. After reading 9 display values, make the standard frequency The source stops working; according to the maximum of the above 9 displayed values ​​f max and minimum f min Obtain the time base stability of the checked critical tripping tachometer: S f =(f max -f min ) / f 0 .

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Abstract

A critical interruption tachometer static performance detection method relates to the steam turbine rotating speed measurement field. The method is used to solve problems that a critical interruption tachometer can not carry out detection and detection methods are insufficient. The detection method of the invention comprises a detection method of speed detection accuracy, a time base stability detection method, a detection method of variability of an indicating value and a detection method of detecting hitting accuracy of a ram and retraction accuracy. According to the invention, the critical interruption tachometer possesses a detection method; the critical interruption tachometer after being detected by using the method possesses reliability and can ensure accuracy. The method of the invention is suitable for a steam turbine rotating speed measurement field.

Description

technical field [0001] The invention relates to a method for detecting the static performance of an emergency blocking tachometer. Background technique [0002] The critical trip tachometer is a speed measurement device for turbo generators or other large and medium-sized rotating machinery. Due to its importance, overspeed tests should be carried out regularly according to national regulations to ensure the reliable action of the impactor. The emergency interrupt tachometer cannot be used directly for verification after purchase or maintenance. As a measuring instrument, there is a lack of verification procedures and methods, which makes it difficult to evaluate the accuracy of its indicators and cannot provide effective guarantees for its reliability. Contents of the invention [0003] The invention aims to solve the problem that the critical blocking tachometer cannot be detected and lacks a detection method, and further provides a static performance detection method o...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01P21/02
Inventor 孙颖霞杨淑宏巴太李国红李景春艾哲峰于辉刚
Owner HARBIN TURBINE
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