A control system protection device and protection method based on temperature measurement
A control system and protection device technology, applied in the direction of electrical program control, sequence/logic controller program control, etc., can solve the problems that it is difficult to avoid the interference of false signals on the control system, the impact is large, and the use effect is not obvious.
Active Publication Date: 2016-06-22
WUKUN STEEL
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Problems solved by technology
Taking ironmaking blast furnace fans as an example, under normal circumstances, there will be basically no high temperature. Even if the temperature rises beyond the interlock action, it will stop. But it has become the killer of the control system, directly threatening the safe operation of the equipment, often causing unnecessary shutdowns and huge losses
[0003] PLC is an industrial control system widely used at present, and the CPU is the core of the software and hardware of the entire control system. When the general controller completes the basic data signal processing, it has flexible alarm processing and quality code functions. Although each manufacturer produces The control systems have their own quality codes, but only the basic protection measures are considered, and generally only meet the basic control requirements, and cannot meet the safety requirements of large-scale equipment on site
In the industrial control system protection device based on temperature measurement, no matter the temperature sensor is in poor contact, disconnection, short circuit or interference, the measurement signal such as resistance will rise rapidly, and the PLC control system will inevitably receive a false signal leading to the connection. The output of the misoperation signal of the lock stop indirectly causes the occurrence of equipment misoperation accidents
Although the control systems in the prior art will adopt certain measures to protect against temperature interference, the levels are different, the effect of use is not obvious, and the limitations are too large; The lock has a great influence, and it is difficult to avoid the interference of false signals on the control system
Method used
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Embodiment 1
[0040] like figure 2 As shown, take the temperature measuring point A as an example to measure the bearing temperature of the blast furnace fan. Since the bearing temperature fluctuation range is 60-80°C under normal circumstances, a PT100 thermal resistance with a range of 0-200°C is used as the temperature measuring probe. ,Proceed as follows:
[0041] S100: Before and after the operation of the control system, set and save the preset filtering time of 1-5s in the effective value processing step S300 and the preset effective value of 20-60°C in the chain judgment step S400, the preset alarm value of 75°C and The preset chain value is 85°C;
[0042] S200: When the system is running, the PT100 thermal resistance probe measures the bearing temperature of the blast furnace fan measuring point A;
[0043] S300: filter the measured temperature signal and / or a modulus device, output and process the temperature signal;
[0044] S400: Obtain the temperature value measured by the ...
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The invention discloses a control system protection device and protection method based on temperature measurement. The protection device includes a temperature sensor for measuring the temperature of the control device, and outputs the measured temperature; the effective value processing unit is used for calculating the effective value of the measured temperature, and outputs the effective value of the temperature; the chain judgment unit is used for the The effective temperature value is compared with the preset effective value, and when the effective temperature value is not less than the preset effective value, an abnormal alarm signal is output to the alarm device and / or a chain protection signal is cut off to the control system. The protection method includes the steps of temperature measurement, effective value processing and chain judgment. The present invention pre-sets effective values, and when disconnection, short circuit, or poor contact occurs at the temperature measuring point, the collected data is processed and compared within a specified time, and the data identified as false signals by the system is isolated and processed in time to avoid The signal input leads to the misoperation of the interlock protection of the control system, which improves the reliability of the system.
Description
technical field [0001] The invention belongs to the technical field of industrial automation, and in particular relates to a temperature measurement-based protection device and a protection method for a control system that can effectively improve reliability. Background technique [0002] The temperature measurement reliability of large-scale equipment is especially important for the safe operation of the entire unit, and whether the temperature measurement value is true and reliable is related to whether the entire unit control system can effectively avoid unnecessary malfunctions, so that the interlock protection of the control system can effectively ensure large-scale Safe and reliable operation of equipment. The traditional control system chain protection considers the absolute safety of the unit, but in practical applications, the absolute reliability of the unit is more required. Taking ironmaking blast furnace fans as an example, under normal circumstances, there wil...
Claims
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IPC IPC(8): G05B19/04
Inventor 徐立荣
Owner WUKUN STEEL