What is the purpose of regular maintenance of electrical equipment

The purpose of regular maintenance of electrical equipment is an important measure for the safe operation of the power system.

1) The initial state of the electrical equipment running in the power grid is good or bad, and the working conditions are different from each other, some are due but do not need maintenance, and some are not expired, but are likely to need maintenance. The regular overhaul system of electrical equipment is that regardless of whether there is a problem with the operating equipment, even if it is a healthy equipment, as long as it is due to be overhauled, it is very easy to cause the blind and needless maintenance phenomenon of "minor illness and big treatment, no disease and treatment" of electrical equipment.

2) Some factories and institutes, due to the influence of funds and other factors at that time, resulting in unreasonable main junction line after commissioning, single operation scheduling mode, poor power supply reliability, main transformer or three-side (both sides) circuit breaker and other power outages have a greater impact of power outage when the equipment needs to be overhauled due to the requirements of system operation or local administrative intervention, and can not carry out power outage overhaul or pre-test on time, resulting in the extension of the equipment maintenance and trial repair cycle, so as to not be able to grasp the actual operation status of the equipment.

3) The equipment unit belonging to the same bus, due to its different working nature and operation time, will inevitably lead to different overhaul and test cycles. In the case of equipment power outage maintenance and lack of scientific arrangements in the test plan, it is often necessary to arrange power outages and test tests in several different periods when all the overhaul and test items should be completed by a single power outage, resulting in frequent power outage losses.

4) In some units, due to the backwardness of maintenance and test equipment, poor accuracy, complex test wiring, and long maintenance and testing time, the power supply of enterprises is reduced.

In summary, in order to ensure the safety of operating equipment, unnecessary maintenance is minimized. To improve the reliability of power supply, the following measures are proposed for reference:

1) Gradually change the electrical equipment from the current regular overhaul system to the state maintenance system. The so-called state maintenance is to accurately grasp the operation status information of the equipment as the guide, and change the time-based regular maintenance to the state-based predictive maintenance, so that the equipment is in operation as much as possible. For this reason, the author believes that although the main transformer or circuit breaker equipment affected by the power outage has reached the overhaul cycle, in this overhaul cycle, it has not suffered the impact of strong short-circuit current in operation, and the body has no seepage leakage, and the test data in the previous preventive tests are normal, and the main insulation parameters are not abnormal, so the equipment overhaul cycle should be postponed to a limited extent according to the situation.

During this period, the operation inspection and maintenance of the equipment should be strengthened, and when there are abnormal changes in some parameters, it should be decided whether it is a minor repair or a major repair according to the specific situation.

2) Adopt the best monitoring technology device to reduce the probability of equipment power failure test and improve the reliability of power supply. The main objects of equipment monitoring are: temperature monitoring of relevant parts of the equipment; Partial discharge and positioning of transformers and reactors; dielectric loss factor, leakage current, and capacitance monitoring of capacitive power equipment (including current transformers, capacitive voltage transformers, coupling capacitors, and main transformer bushings); Dirt leakage current monitoring of insulators; Voltage transformer primary current, insulation resistance monitoring; System bus voltage harmonic component monitoring; Arrester leakage current monitoring.

The inspection, maintenance and adjustment of electrical equipment must be carried out by (a).

a.Electrical Repairman BTeam Leader CCaptain of the mechatronic team

Electrical equipment is a general term for generators, transformers, power lines, circuit breakers and other equipment in the power system. The important role played by electricity in our life and production cannot be ignored, it brings us great convenience and becomes an important energy source in our production and life. The most critical factor in a power plant that allows power to function and be delivered properly is electrical equipment.

Qualifications and Requirements for Electrical Operators:

1) Electrical work must be professionally trained, pass the examination, and hold an electrical operation certificate.

2) Electrical workers who have interrupted electrical work for more than six consecutive months for any reason must pass the re-examination before they can work.

3) Electrical personnel must strictly implement the national safety operation regulations.

4) Electrical staff must be strictly familiar with the relevant fire protection knowledge, be able to correctly use fire fighting appliances and equipment, and be familiar with the emergency rescue methods for personal electric shock.

5) The transformer, power distribution station and electrician class should formulate and improve the rules and regulations and the corresponding post responsibility system according to the actual situation of the post and the seasonal characteristics. Do a good job of prevention and safety inspections, and deal with problems in a timely manner.

6) The site should be equipped with safety equipment, protective equipment and fire-fighting equipment. And regular inspection tests.

7) The operation and maintenance of electrical equipment and lines in flammable and explosive places must be carried out in accordance with relevant national standards.

8) Electrical equipment must have reliable grounding (zero connection), lightning protection and anti-static facilities must be in good condition, and regularly tested.

The principles that should be followed in the maintenance of power equipment are: (1) Implement the maintenance policy of "prevention first", so that "it must be repaired, and it must be repaired" (2) The maintenance plan should be arranged according to the unified arrangement of the power grid, and the coordination and cooperation should be done to reduce the equipment downtime. Improve grid operational reliability and equipment availability.

3) Equipment overhaul should be combined with technical updating, and equipment renovation plans should be made in view of the needs of equipment defects and the continuous development and improvement of the power grid, and planned to be combined with overhaul.

The accident repair of power equipment should follow the basic principles of "selecting the heavy and avoiding the light" and "first ensuring the signal electricity".

The maintenance and maintenance of electrical equipment should be the responsibility of the Industrial Machinery Department.

The maintenance and upkeep of electrical equipment is as follows:

1) During the first-level maintenance of the machine tool, the maintenance work of the machine tool electrical appliances is carried out. Secondary maintenance still needs to be carried out as usual;

2) Focus on checking the contactors and relay contacts with tight action and large current;

3) In order to withstand the mechanical shock and current burning loss of frequent shear circuits, the contacts of most contactors and relays are made of silver or silver alloy, and a layer of silver oxide or silver sulfide will naturally form on its surface, which does not affect the conductivity;

4) Under the action of the arc, its surface will be reduced to silver, so do not remove it at will;

5) Overhaul the contactors and relays with obvious noise, find out the cause and repair it before continuing to use, otherwise it should be replaced with new parts;

6) Check the thermal relay to see if it can operate normally. The calibration result should be in line with the operating characteristics of the thermal relay;

7) Check the time relay to see if its delay time meets the requirements.

The maintenance and maintenance of daily electrical equipment should be the responsibility of equipment maintenance personnel (maintenance electricians).

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