The power supply rectifier cabinet is an important equipment for aluminum electrolysis production. It undertakes rectification and power transmission, and is a necessary equipment to provide DC power; it plays a very important role in the smooth production of aluminum electrolysis. Therefore, professional inspections are incorporated into enterprise equipment management, and with the help of professional tools, preventive and careful inspections are carried out on the prescribed parts of the equipment in accordance with preset cycles and scientific methods.

The power supply rectifier cabinet is an important equipment for aluminum electrolysis production. It undertakes rectification and power transmission, and is a necessary equipment to provide DC power; it plays a very important role in the smooth production of aluminum electrolysis. Therefore, professional inspections are incorporated into enterprise equipment management, and with the help of professional tools, preventive and careful inspections are carried out on the prescribed parts of the equipment in accordance with preset cycles and scientific methods.

Through professional and regular inspection of equipment, data collection and analysis, so as to reason and judge and technically diagnose the problems existing in the equipment, the potential failure tendency of the equipment can be found in time. But at present, there is no unified standard for professional spot inspection of aluminum electrolytic power supply rectifier cabinets. This article combines the author’s professional spot inspection experience to expound the relevant process and work ideas of professional spot inspection of aluminum electrolysis rectifier cabinets.

1 Overview

Professional spot inspection is to use professional and technical personnel to regularly inspect key parts of equipment according to certain standards and certain cycles, using professional inspection tools and scientific methods, and through data collection, comparison and analysis, draw corresponding conclusions, so as to judge the working status of the equipment and Tendency failure, timely control and rectification.

2. The importance of professional spot inspection to the safe operation of aluminum electrolysis power supply rectifier cabinets

As an aluminum electrolysis manufacturer, the power supply rectifier cabinet is the basic condition for maintaining aluminum electrolysis production. The production of aluminum electrolysis is inseparable from continuous, stable and efficient electric energy. However, once a failure occurs, it will not only directly affect the normal production of the electrolysis series, but also the direct and indirect losses are inestimable.

It is particularly important to strengthen the monitoring of equipment operating conditions to prevent and control equipment accidents. It has far-reaching significance for the long-term safe and stable operation of the equipment and reducing the economic losses caused by equipment failures.

3.Professional inspection links and procedures

3.1 Professional spot check

Develop professional inspection standards and inspection plans.

Select special inspection instruments and equipment.

The specified items and parts are inspected according to the specified cycle, and data is collected.

On-site inspection, intuitive judgment; data analysis, comparison, comprehensive judgment.

Develop measures to make improvements.

3.2 Professional inspection process

 Professional spot inspection and thinking plan of aluminum electrolysis power supply rectifier cabinet

4. The method of professional inspection

4.1. “Five senses” check method

The “five senses” inspection method refers to the five senses of professional technicians: sight, hearing, smell, taste, and touch five intuitive methods. Vision is to inspect and watch through the eyes of professional technicians to visually check the hidden dangers on the surface of the equipment. , such as: displacement, deformation, and signs of overheating of components, abnormal instrument Display, leakage of water in pipelines, etc.; listening is to use the ear to detect the abnormal sound of the equipment; smell is to smell the equipment caused by overheating, etc. Touching refers to touching safe parts such as non-charged objects with hands, and feeling the temperature, humidity, deformation, etc. of the device with hands.

Through the “five senses” inspection, the purpose is to intuitively discover the existence of physical changes in the equipment. This kind of inspection method is more convenient. Of course, the “five senses” inspection method is only a basic inspection method used in conjunction with professional inspection. Sometimes this intuitive method cannot directly determine the hidden dangers of equipment, and it needs to be combined with Dedicated instrument for determination.

4.2. Special instrument inspection method

Special instrument spot inspection method: refers to the use of professional instruments and instruments to inspect and test the equipment, and to judge the abnormality of the equipment through the comparison and analysis of the inspection and test data values. At present, according to the nature of the enterprise and the configuration of professional inspection instruments, the commonly used special instruments are: infrared thermometer, infrared imager, telescope, temperature measurement paper, etc.

5. Professional spot inspection of rectifier cabinet

5.1. Preparation for inspection

Before doing professional inspection of the rectifier cabinet, collect the basic information of professional inspection. For example: equipment design parameters: rectifier cabinet rated voltage 1220V, 65kA, etc.; equipment operating parameters: output DC voltage 1086V, 42kA, load rate 64.62%, on-load switch gear 69, rectifier cabinet outlet water temperature 31 ℃, etc.; other information: Inspection date, inspection personnel, ambient temperature, professional inspection equipment and models, etc.

5.2. Professional inspection items and parts

For the professional spot inspection of the rectifier cabinet, the first is to conduct a scanning inspection of the appearance of the equipment. The main purpose is to find the external problems exposed by the equipment, such as: water pipes falling off or water seepage, appearance deformation of components, cracks and signs of overheating, water temperature gauges Abnormal display, abnormal display of water pressure gauge, loose connection or crimping, etc.

Check the key parts in the rectifier cabinet. Mainly through infrared thermometers or infrared thermal imagers and other special instruments to carry out single-point or multi-point temperature precision inspections on rectifier bridge arms, rectifier diodes, fast fuses, insulating parts, bus nodes, rectifier cabinet frames and other parts.

5.3. Inspection and inspection data collection

Use infrared spot thermometers, infrared imagers, etc. to spot the rectifier bridge arms, rectifier diodes, fast fuses and other parts in the rectifier cabinet from top to bottom, and confirm the maximum and minimum temperature ranges of each part. Under the same conditions, the temperature of comparable parts in the same rectifier cabinet should be relatively similar. Through this method, the spot inspection temperature of each part is filled into the professional spot inspection data table, and the maximum temperature, minimum temperature, average temperature, etc. of each part are determined as the typical value for judging the temperature of each part under this operating condition.

5.4. Factors to be considered in point inspection data analysis

The heat exchange of the rectifier cabinet is through the rapid flow of high-purity water (also known as deionized water) in the designed pipeline, so as to replace the heat in the heat-generating part. Through the trend analysis of spot inspection data, it is found that there is generally a difference in the temperature of the water inlet end and the water outlet end. Usually, the temperature of the water outlet end is a few degrees higher than that of the water inlet end.

If the temperature of a part or point is higher than the temperature of its comparable parts, it can continue to be closely tracked and inspected, and the interval between inspections can be designed to be shorter. From the analysis of the temperature data of the entire point inspection, no sudden change in temperature or trend change was found under the existing operating conditions. It can be determined as a special temperature by comprehensive analysis and evaluation with the equipment technical management personnel.

If the result of the spot temperature of a certain part is compared with the adjacent comparable parts, it is found that the temperature is obviously increased, then the data of this spot temperature should be longitudinally compared with the typical value data of the same spot of the previous several times, and then the Can detect and determine if there is an anomaly. Once there is an abnormal part or point of temperature, it is necessary to focus on it, and at the same time, report to the relevant technical management personnel or leaders according to the reporting procedure of professional spot inspection. Analyze equipment temperature anomalies.

5.5. Professional inspection results

Through the comparison and analysis of the professional spot inspection data of sensory and special instruments, the hidden dangers of the equipment can usually be found in time: deformation of equipment parts, displacement, insulation decline, loose crimping, component characteristics decline, bridge arm and water pipe failure, etc. For the problems detected by spot check, in addition to the intuitive judgment, it is generally necessary to conduct multiple observations, data comparison and other confirmations. Otherwise, it cannot be qualitative at will, and it is necessary to accurately grasp the accuracy of professional spot inspections.

6. Conclusion

The professional spot inspection of the rectifier cabinet is a major part of the professional spot inspection of the aluminum electrolytic rectifier power supply system. At present, each enterprise formulates the corresponding spot inspection plan according to the characteristics of their own equipment, which has certain pertinence. With the in-depth development of spot inspection work, professional spot inspectors will summarize experience and carry out theoretical discussions while improving and formulating unified spot inspection standards and management systems, which will play an important role in reliably grasping and timely understanding of the comprehensive operating conditions of equipment. important role.

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