The overhaul and maintenance of electrical equipment is a process that must be carried out during the operation of electrical equipment. With the progress and development of science and technology, the operation of electrical equipment in China is receiving more and more attention, and more people are gradually paying attention to the operation of power plant equipment, so the overhaul and maintenance of electrical equipment has become one of the top priorities in the operation of power plants. The power plant must ensure the efficient and normal operation of electrical equipment through certain means, so as to ensure that the power plant can normally produce the electricity needed for the residents. At present, the use of electrical equipment in China often does not reach the intended life of the equipment, on the one hand, because of the existence of the power equipment itself.

　　A, the concept of planned maintenance and form

　　Concept: overhaul (maintenance): all activities carried out to maintain or restore the product to the specified state.

　　Maintenance: the measures taken to maintain the product in the prescribed state.

　　Forms: overhaul, minor overhaul, repair (maintenance)

　　Overhaul: major parts of the equipment are dismantled and the components are replaced. Necessary tests and cleaning are carried out to restore the equipment to its original performance.

　　Minor repairs: The body of the equipment is dismantled and the necessary tests and cleaning are carried out to restore it to its original performance.

　　Repair (maintenance): no disassembly of the equipment, only cleaning of the external surfaces.

　　II. Purpose and principles of planned maintenance:

　　Purpose: The repaired equipment should be guaranteed to be in good condition during use, to meet production needs and to reduce overhaul costs.

　　Principles: "prevention-oriented, should be repaired must be repaired, due to repair, repair must be repaired"

　　Third, the information should be mastered before the overhaul:

　　1, the last overhaul to this overhaul of the running time.

　　2, in a maintenance cycle in the operation of abnormalities, defects and equipment damage.

　　3, the insulation test before the overhaul, oil testing data and information on the last overhaul.

　　4、The historical legacy of this equipment and the problems of manufacturing quality.

　　5、The new improvement plan of this equipment.

　　IV. Preparatory work to be done before the planned overhaul:

　　1, the preparation of the start report and construction plan task book.

　　2、Implementation of the overhaul should replace the accessories, special tools, the preparation of material plans.

　　3, for the defects of this equipment, make a good overhaul plan, and according to this plan, implement the corresponding materials, instruments, etc.

　　4. Do a good job of applying for power outage for equipment overhaul in advance.

　　V. Organisation of planned overhaul:

　　Inspection site must have on-site engineering responsible, technical responsible, responsible. In the overhaul work must seriously implement the regulations, overhaul procedures and various technical management systems. The above content exists in the form of operating instructions.

　　Sixth, the main content of the overhaul report:

　　1, the equipment model, technical parameters, production plant, factory year, installation location, etc..

　　2, overhaul standard items and non-standard items table.

　　3, the replacement of the main parts of the name and material.

　　4, the specified commissioning and test data.

　　5, the main work carried out to eliminate defects and projects.

　　6, remaining problems (including measures to be taken and problems to be solved for the next major and minor repairs).

　　7, other thematic summaries and issues that need to be clarified.

　　Preventive testing of electricity provides solutions in the must-use equipment are:

　　1, frequency conversion series resonance test device is the use of the principle of series resonance, the use of excitation transformer excitation series resonant circuit, adjust the output frequency of the frequency conversion controller, so that the circuit inductance L and test products C series resonance, resonant voltage is added to the test products on the voltage. The frequency conversion series resonance test device is widely used in electric power, metallurgy, petroleum, chemical industry, etc. It is suitable for the handover and preventive test of capacitive test pieces with high capacity and high voltage.

　　2.ZGF DC high voltage generator provides DC high voltage source, which is specially used to test the electrical insulation strength and leakage current of power devices. The intelligent DC high voltage generator is a new product according to the requirements of the Chinese industry standard ZBF 24003-90 "General Technical Conditions for Portable DC High Voltage Generators". The intelligent DC high voltage generator has various protection functions, such as: low voltage overcurrent, low voltage overvoltage, high voltage overcurrent, high voltage overvoltage, zero position protection, non-earthing protection, etc. Fault sampling using special sensors, the action time is nanosecond, optical isolation components are also nanosecond, the action time is generally in 10 microseconds can completely shut down the DC main circuit, so that the large protection of the instrument from damage.

　　3. Intelligent AC withstand voltage test device is a special light insulation withstand voltage test device produced by our company, the AC withstand voltage test device has the characteristics of easy to use and maintain, superior performance, reliable use, beautiful appearance and structure, sturdy and durable, easy to move. It is the necessary equipment for power supply enterprises, large factories, metallurgy, power plants, railways and other departments that need electric power maintenance. The intelligent AC withstand voltage test device adopts advanced micro-electronic processing technology, and the whole process of use can be set in advance. All test items are set and tested automatically, without manual intervention.