With the development of science and technology, electrical equipment is constantly upgrading. In the high-risk industry of coal mine, the overhaul and maintenance of electrical equipment are paid more and more attention by enterprise leaders. With the improvement of digital and automatic program control, the maintenance of electrical equipment will gradually replace other maintenance methods in the future, from emergency repair in the past to regular maintenance in the later period to preventive regular test now. The meaning of condition-based maintenance is to monitor and analyze the running status information of electrical equipment online or offline, and automatically analyze and diagnose the health status of the equipment through the collected signals, data and icons, so as to determine the dynamic of equipment maintenance, whether it is overhaul, minor repair, suspended maintenance or early maintenance. That is to say, before the arrival of regular equipment maintenance, the maintenance should be carried out in advance according to the state of the equipment, or the maintenance cycle should be extended to ensure the safe operation of all electrical equipment and provide a solid foundation for the safe and high-yield of the mining area.

Electrical equipment; Condition maintenance; Discussions and suggestions

1 Introduction

1. 1 At present, the maintenance of electrical equipment is to carry out regular preventive tests and acceptance tests on the equipment according to the handover test regulations and preventive test regulations of power equipment. With the large investment of imported mechanical and electrical equipment in the new area, the company's digital and automatic information program control level has been improved. For the newly installed mechanical and electrical equipment, advanced automatic information collection and data analysis are adopted to carry out effective online monitoring and condition analysis and judgment, and a condition maintenance scheme is bound to be put forward in the future.

At present, there are no clear regulations and standard procedures for condition-based maintenance, because the old and new conditions of electrical equipment are very different. Only by investing a lot of material and financial resources can the mechanical and electrical equipment in the old areas do a good job in the preliminary work of condition-based maintenance. In order to truly realize the condition-based maintenance of electrical equipment, it is necessary to monitor the running state of the equipment on line, and analyze and compare the detected data, so as to determine the basic situation of the equipment operation, and then put forward a maintenance plan for the equipment maintenance.

1.2 Because the service life of electrical equipment is also different, regular maintenance of equipment according to a certain fixed maintenance cycle will make it too late for some equipment to be repaired after its service life expires, so emergency maintenance is needed after sudden failure or accident. However, some equipment has been overhauled in advance before reaching the service life cycle, which not only reduces the utilization rate of electrical equipment, but also wastes a lot of manpower, material resources and financial resources.

1.3 With the popularization of new technologies and equipment in new mining areas, especially the improvement of line insulation level and voltage level, and the use of new vacuum circuit breakers and transformers, it is urgent to adopt new test and maintenance modes to meet the safety maintenance of new equipment. Especially for the equipment with automatic information control, it is feasible and reliable to adopt condition-based maintenance under the condition that the equipment state is controllable.

2 the principle of electrical equipment condition maintenance

Condition-based maintenance of electrical equipment is a new technology integrating automatic monitoring technology and diagnosis technology, and it is a scientific, reasonable and economical maintenance mode. Its characteristic is that the time and duration of maintenance can be predicted in advance, and the maintenance purpose is clear. Condition-based maintenance should start from the source, and monitor the whole process of operation and debugging from design, equipment selection, digitization and equipment monitoring to ensure that the equipment is in good condition and the collected data is accurate and reliable. Then, through real-time analysis and diagnosis, the online state of the equipment can be judged, so as to better ensure that the equipment can be put into operation without hidden dangers. Equipment condition monitoring is an important part of electrical equipment condition maintenance. Without on-line monitoring of equipment, condition maintenance is impossible. For example, the infrared thermometer, oil chromatography analyzer and harmonic analyzer currently used by our company are all effective means to find the latent faults of overhead power lines and transformer equipment. It also provides real-time, accurate and comprehensive equipment status information for the detection system, and provides analytical basis for diagnosing equipment status. Therefore, in order to collect monitoring information well, it is necessary to monitor the status of equipment first to ensure the comprehensiveness of equipment status information. At the same time, appropriate monitoring equipment should be used to monitor the equipment status to ensure the accuracy and real-time performance of the equipment status information.

3 the importance of electrical equipment condition maintenance

Condition-based maintenance of electrical equipment is not a direct embodiment of economic benefits, but a feedback function of service nature. Condition-based maintenance is an important maintenance project under the premise of serving the safe operation of new equipment. Combined with the actual development of the company's new district, most of the mechanical and electrical equipment is imported from abroad. Do a good job in online inspection of imported equipment. Through effective data collection and analysis, the running state of equipment can be correctly diagnosed, so as to determine the maintenance dynamics of equipment. Its significance lies in that through on-line detection and condition maintenance, the operation of equipment can be better detected and the equipment can be ensured to run in a safe and sound state.

4 Development direction of condition-based maintenance of electrical equipment

At present, the condition-based maintenance of equipment has not formed a climate, and the national power industry has not put forward the corresponding testing procedures. But in the near future, it may become a direction of information development. Condition-based maintenance can effectively overcome the shortcomings of regular maintenance, from due compulsory maintenance to compulsory maintenance. It improves the availability, safety and reliability of the equipment, which is the management innovation and technical innovation of the safe operation of mechanical and electrical equipment in the new mining area. Condition-based maintenance of equipment should choose different maintenance methods scientifically and reasonably according to the importance and controllability of different equipment, and form a comprehensive maintenance method integrating fault maintenance, regular maintenance, condition maintenance and improvement maintenance.

Discussion and suggestion on condition-based maintenance of electrical equipment

Condition-based maintenance of electrical equipment is an effective means to ensure the reliable operation of power system and reduce equipment accidents. With the development of mining area, reliable and high-quality condition-based maintenance directly affects the operation safety of electrical equipment in mining area, reducing the accident rate and equipment damage rate.

Especially the extension of new mines, digital technology and automation information. We can try to install an online monitoring system on new mechanical and electrical equipment, analyze and diagnose the data monitored by the operating equipment, and ensure the equipment to run more safely and reliably. Such as new circuit breakers, transformers, relay protection, transmission lines, etc. Condition-based maintenance may be a development direction of maintenance industry, which can better improve the reliability of equipment operation.

6 conclusion

Condition-based maintenance is put forward by combining the current maintenance mode with the idea of future equipment maintenance. One of the highlights of condition-based maintenance is that the equipment can know the performance of the equipment under live operation. Then through the diagnosis results of condition maintenance, the equipment is overhauled to ensure that the equipment can be put into operation safely again.

References:

[1] Research on Implementation Technology of Condition-based Maintenance of Power Equipment, Huang Lingjie, 2007.

[2] "Implementation Strategy of Condition-based Maintenance of Municipal Power Supply Enterprises" Journal of Electric Power in 2008

About the author:

Mao Jidong, Assistant Engineer of Electrical Laboratory of Huainan SDIC Xinji Energy Co., Ltd.