阅读说明：本技术 轴承温度测量异常的智能判断方法及系统 (Intelligent judgment method and system for bearing temperature measurement abnormity ) 是由 李明 古栖铭 李冬梅 钟传兵 王帆 于 2021-07-30 设计创作，主要内容包括：本发明公开了轴承温度测量异常的智能判断方法及系统,该方法包括如下步骤：实时采集轴承温度数据；判断一个控制周期内轴承温度速率变化量是否大于第一阈值,若是,则现场发出告警；若否,则继续监测；判断一个控制周期内轴承温度速率变化量是否超过第二阈值,所述第二阈值大于第一阈值,若是,则控制CTU计数模块记录速率突变次数,当CTU计数模块记录速率突变次数超过阈值时,立即闭锁跳闸设备、现场发出告警,同时将速率突变次数传送到后台服务器,并提醒操作人员；若否,则继续监测。本发明无需增加温度测点,无需增加电缆、DCS硬件设施等,在节省企业费用的同时实现单点温度可靠保护转动机械设备。(The invention discloses an intelligent judgment method and system for bearing temperature measurement abnormity, wherein the method comprises the following steps: collecting bearing temperature data in real time; judging whether the bearing temperature rate variation in a control period is greater than a first threshold value, and if so, sending an alarm on site; if not, continuing monitoring; judging whether the bearing temperature rate variation in a control period exceeds a second threshold, wherein the second threshold is larger than the first threshold, if so, controlling a CTU counting module to record the rate mutation times, locking a tripping device immediately and sending an alarm on site when the rate mutation times recorded by the CTU counting module exceed the threshold, and simultaneously transmitting the rate mutation times to a background server and reminding an operator; if not, continuing monitoring. According to the invention, temperature measuring points are not required to be added, cables, DCS hardware facilities and the like are not required to be added, and the rotating mechanical equipment is reliably protected by single-point temperature while the enterprise cost is saved.)

1. The intelligent judgment method for bearing temperature measurement abnormity is characterized by comprising the following steps:

collecting bearing temperature data in real time;

judging whether the bearing temperature rate variation in a control period is greater than a first threshold value, and if so, sending an alarm on site; if not, continuing monitoring;

judging whether the bearing temperature rate variation in a control period exceeds a second threshold, wherein the second threshold is larger than the first threshold, if so, controlling a CTU counting module to record the rate mutation times, locking a tripping device immediately and sending an alarm on site when the rate mutation times recorded by the CTU counting module exceed the threshold, and simultaneously transmitting the rate mutation times to a background server and reminding an operator; if not, continuing monitoring.

2. The intelligent judgment method for bearing temperature measurement abnormality according to claim 1, characterized by further comprising the steps of: and resetting the CTU counting module after confirming that the temperature of the bearing is recovered to be normal.

3. An intelligent judgment method for bearing temperature measurement anomaly according to claim 1, wherein said alarm comprises an acoustic and/or optical alarm.

4. The intelligent judgment method for the abnormality of the bearing temperature measurement according to claim 1, wherein the manner of reminding the operator includes a short message, screen flashing of a background server, and the like.

5. The intelligent judgment system for bearing temperature measurement abnormity is characterized by comprising an acquisition module, a control module, a CTU counting module, a temperature protection locking module and an alarm module, wherein,

the acquisition module is used for acquiring bearing temperature data;

the control module is used for receiving the bearing temperature data, analyzing and processing the bearing temperature data, outputting an alarm signal to the alarm module according to a processing result and outputting a starting signal to the CTU counting module; the system also comprises a CTU counting module, a temperature protection locking module, a background server and a locking module, wherein the CTU counting module is used for recording the speed mutation times, outputting a locking signal to the temperature protection locking module, transmitting the speed mutation times to the background server and reminding an operator;

the CTU counting module is used for recording the rate mutation times;

the temperature protection locking module is used for locking the tripping device;

and the alarm module is used for sending an alarm.

6. The system for intelligently judging bearing temperature measurement abnormality according to claim 5, further comprising a reset count module for resetting the CTU count module.

7. An intelligent bearing temperature measurement anomaly determination system according to claim 5, wherein said alarm comprises an acoustic and/or optical alarm.

8. The intelligent judgment system for bearing temperature measurement abnormity according to claim 5, wherein the manner for reminding an operator comprises a short message, screen flashing of a background server and the like.

Technical Field

The invention relates to the technical field of anomaly detection, in particular to an intelligent judgment method and system for bearing temperature measurement anomaly.

Background

In the power generation process of a thermal power plant, bearing temperature monitoring is very important for large-scale rotating machinery, abnormal rotating machinery can be stopped in time by setting out bearing temperature out-of-limit protection, and accidents are prevented from being expanded.

At present, in order to save cost, each bearing is generally provided with a single temperature measuring point, only single-point temperature out-of-limit protection is provided on a DCS control system, the protection principle of 'three-out-of-two' relatively independent in the whole process from a sampling point to a DCS input module cannot be followed, and temperature protection misoperation is easily caused. When the temperature element measures the circuit contact failure, and the measured value rises suddenly and falls suddenly repeatedly, the existing temperature rate judging logic of the DCS can not correctly identify the temperature measurement abnormality, the temperature protection outlet can not be locked, and the monitoring panel operator can not be informed in time to cause alertness, so that the equipment is tripped by mistake, and huge loss is brought to production. As shown in FIG. 2, the measurement is unstable due to intermittent grounding when the temperature line of the bearing of the induced draft fan is wetted. When the time is 9 minutes and 41 minutes, the temperature (curve 1) of a bearing of the induced draft fan is suddenly changed by 1, the temperature exceeds the limit of the temperature tripping module, and the protection is not exported; when the time is 9 minutes and 48 minutes exist, the sudden change 2 occurs again, and the protection outlet is limited by exceeding the limit of the temperature trip module; when the time is 9 minutes and 56 minutes, the temperature rise slope is obviously slower than that of the first two times, and the temperature tripping module cannot lock the logic outlet, so that the induced draft fan trips, and the power generation loss is further caused.

Meanwhile, under the existing conditions, if a bearing measuring point is added, a series of construction and cost problems such as measuring point hole opening, cable laying, software and hardware design of a DCS system and the like are involved, so that the method for realizing logic judgment of 'three to two' by adding the measuring point is unwilling to invest more funds to implement by many enterprises.

Disclosure of Invention

In order to solve the technical problem, the invention provides an intelligent judgment method and system for bearing temperature measurement abnormity. According to the method and the system, temperature measuring points are not required to be added, cables, DCS hardware facilities and the like are not required to be added, enterprise cost is saved, and meanwhile, single-point temperature reliable protection of rotating mechanical equipment is achieved. In order to achieve the purpose, the invention adopts the following technical scheme:

the intelligent judgment method for bearing temperature measurement abnormity comprises the following steps:

collecting bearing temperature data in real time;

judging whether the bearing temperature rate variation in a control period is greater than a first threshold value, and if so, sending an alarm on site; if not, continuing monitoring;

judging whether the bearing temperature rate variation in a control period exceeds a second threshold, wherein the second threshold is larger than the first threshold, if so, controlling a CTU counting module to record the rate mutation times, and when the rate mutation times recorded by the CTU counting module exceed the threshold, immediately locking a tripping device, sending an alarm on site, transmitting the rate mutation times to a background server, and reminding an operator; if not, continuing monitoring.

Preferably, the method further comprises the following steps: and resetting the CTU counting module after confirming that the temperature of the bearing is recovered to be normal.

Preferably, the alert comprises an acoustic and/or optical alert.

Preferably, the manner of reminding the operator includes a short message, screen flashing of a background server, and the like.

Bearing temperature measures unusual intelligent judgement system includes: an acquisition module, a control module, a CTU counting module, a temperature protection locking module and an alarm module, wherein,

the acquisition module is used for acquiring bearing temperature data;

the control module is used for receiving the bearing temperature data, analyzing and processing the bearing temperature data, outputting an alarm signal to the alarm module according to a processing result and outputting a starting signal to the CTU counting module; and the system is also used for outputting a locking signal to the temperature protection locking module according to the speed mutation times recorded by the CTU counting module, transmitting the speed mutation times to the background server and reminding an operator.

The CTU counting module is used for recording the rate mutation times;

the temperature protection locking module is used for locking the tripping device;

and the alarm module is used for sending an alarm.

Preferably, the device further comprises a reset counting module for resetting the CTU counting module.

Preferably, the alert comprises an acoustic and/or optical alert.

Preferably, the manner of reminding the operator includes a short message, screen flashing of a background server, and the like.

The invention has the following advantages:

1) when the temperature measuring value is repeatedly raised or lowered suddenly due to the fault of the bearing temperature element or poor contact of the measuring loop, and the set temperature rate is more than 10 ℃/s, an operator is reminded of paying attention to the temperature change trend; when the temperature rate is more than 20 ℃/s, the protection outlet of the high-temperature tripping device is automatically locked, and an accident sound alarm can be sent to remind an operator to check the device, so that the device is prevented from being tripped by mistake, and the normal working operation is prevented from being influenced;

2) the invention is provided with the temperature rate abnormity counting module, and the frequency of temperature measurement abnormity can be checked;

3) the invention is provided with the reset counting module, and when the field inspection processing and the measurement recovery are confirmed by the maintainer, the CTU counting module can be reset, the temperature protection can be recovered in time, and the device can be prevented from being refused;

4) the invention is different from the redundancy protection of 'two out of three', the function of reliably protecting the rotating mechanical equipment by single-point temperature can be realized only by optimizing protection judgment logic without increasing temperature measuring points, cables, DCS hardware facilities and other cost input, and the improvement cost is saved for enterprises.

Drawings

The following describes embodiments of the present invention in further detail with reference to the accompanying drawings.

FIG. 1 is a flowchart of a method for intelligently determining bearing temperature measurement anomalies according to one embodiment;

FIG. 2 is a graph of an abnormal temperature of a bearing of an induced draft fan;

FIG. 3 is a functional block diagram of an intelligent bearing temperature measurement anomaly determination system in one embodiment.

Detailed Description

In order to more clearly illustrate the invention, the invention is further described below in connection with preferred embodiments. It is to be understood by persons skilled in the art that the following detailed description is illustrative and not restrictive, and is not to be taken as limiting the scope of the invention.

As shown in fig. 1, the present embodiment provides an intelligent method for determining an abnormal bearing temperature measurement, which is suitable for a rotating machine in a thermal power plant with only single-point bearing temperature protection, and specifically includes the following steps:

and S1, monitoring the temperature of the bearing in real time. When the temperature suddenly rises or falls to exceed 2 ℃ in one control period (within 0.2 second) of the DCS, namely the temperature changes by more than 10 ℃ in 1 second, an alarm of bearing temperature rate out-of-limit (alarm ring rings for 15 seconds) is sent out to remind an operator to pay attention to the temperature.

S2, when the temperature rate suddenly rises or falls to exceed 4 ℃ in one control period (within 0.2 second) of the DCS, namely the change in 1 second is more than 20 ℃, the control module of the DCS recognizes that the bearing temperature is abnormally measured, and the CTU counting module automatically records the rate sudden change times.

S3, when the temperature measurement rate mutation times are more than or equal to 2, the CTU counting module immediately outputs a signal to lock the tripping device, and the device is prevented from being tripped by mistake; and meanwhile, a higher-level alarm (namely an accident sound alarm) of bearing temperature measurement abnormity is sent out, the alarm flickers on a monitoring picture of a background server, an operator is reminded to immediately check whether the equipment is abnormal, and the maintainer is informed to handle the equipment.

And S4, resetting the RESET end of the CTU counting module after the field inspection processing of the maintainer and the confirmation of the measurement to be recovered to normal, and recovering the temperature protection.

In this embodiment, the temperature rate limit value of the step S2 is 20 ℃/S, and a reasonable fixed value can be set according to the maximum temperature value allowed by a specific device bearing, so that the effects of no malfunction and no operation rejection can be achieved.

The method can reset the CTU counting module after manual confirmation, can also reset by adopting the stop state of a rotating machine, or automatically reset the main machine and the auxiliary machine protection within 8 hours and 24 hours respectively according to the 9.4.12 regulation of twenty-five key requirements of the State energy agency for preventing power production accidents.

As shown in fig. 3, the present embodiment provides an intelligent judgment system for bearing temperature measurement abnormality, including: an acquisition module, a control module, a CTU counting module, a temperature protection locking module and an alarm module, wherein,

the acquisition module is used for acquiring bearing temperature data;

the control module is used for receiving the bearing temperature data, analyzing and processing the bearing temperature data, outputting an alarm signal to the alarm module according to a processing result and outputting a starting signal to the CTU counting module; and the system is also used for outputting a locking signal to the temperature protection locking module according to the speed mutation times recorded by the CTU counting module, transmitting the speed mutation times to the background server and reminding an operator.

The CTU counting module is used for recording the rate mutation times;

the temperature protection locking module is used for locking the tripping device;

and the alarm module is used for sending an alarm.

Furthermore, the device also comprises a reset counting module which is used for resetting the CTU counting module.

Further, the alarm comprises an acoustic and/or optical alarm.

Further, the mode of reminding the operator comprises short messages, screen flashing of a background server and the like.

It should be understood that the above-mentioned embodiments of the present invention are only examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention, and it will be obvious to those skilled in the art that other variations or modifications may be made on the basis of the above description, and all embodiments may not be exhaustive, and all obvious variations or modifications may be included within the scope of the present invention.