Method for realizing double-measuring-point protection judgment on DCS (Distributed Control System)

Abstract

The invention discloses a method for realizing double-measuring-point protection judgment on a DCS (Distributed Control System), which comprises the following steps of: configuring a double-measuring-point protection macro command block algorithm by using basic function blocks such as AND, OR, NOT, upper and lower limit judgment, constant setting, switching value signal switching and an RS trigger in the DCS, packaging the algorithm into a double-measuring-point protection macro module, and calling the double-measuring-point protection macro module like the basic function blocks when in use. A protection value and an alarm value are set, by judging temperature threshold values and quality points of two monitoring points, when the two monitoring points are normal, one point reaches the protection value and the other point reaches the alarm value, '1' is output, when one point has a bad quality point or changes too fast, the point is removed, the rest of normal points reach the protection value and '1' is output, and when the two points are abnormal, '0' is output. According to the method, a double-measuring-point protection judgment method is designed by utilizing the configuration of basic functions of the DCS system, so that the method is safer and more accurate, the tripping problem caused by possible misoperation is reduced, equipment fault points can be found in time, and the workload of inspection and analysis is reduced.

Description

【Technical field】 [0001] The invention relates to the technical field of temperature protection of thermal power plants, in particular to a method for realizing protection judgment of double measuring points on DCS. 【Background technique】 [0002] The bearing temperature protection design of most important auxiliary machinery in thermal power plants is single-point protection, such as blower, induced draft fan, primary fan, small machine, front pump, etc. There are two hidden dangers in the protection of a single measuring point: one is that the inaccurate measurement of a single measuring point will cause the protection to malfunction; the other is that when the quality of the measuring point is bad, the protection may refuse to act. By changing the single measuring point to double measuring point, the reliability of the protection can be effectively improved through the method of mutual corroboration. [0003] In view of the hidden danger of the single measuring point of ...

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Problems solved by technology

[0004] The purpose of the present invention is to provide a method for realizing double-measuring-point protection judgment on the DCS, so as to solve the problem that most of the important shaft machine and bearing temperature protection designs are single-measuring point protection at present, and the measurement is inaccurate, and there are bad quality points, When the temperature change rate is too fast, there will be problems such as misjudgment at a single measuring point

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