Since the completion of the self-supplied power plant of Xiezhuang Coal Mine of Xinwen Mining Group in 1995, it has been expanded in the second phase of 2000. At present, the total installed capacity is 24MW, with 8 6kV power supply lines, 2 35kV power supply lines and 3 generator sets. Responsible for the entire coal mine production and power supply tasks in the Nanshan residential area. Due to the limitation of site, construction level and equipment technology level during construction, the temperature inside the power distribution station is high, and the ventilation effect is poor, which affects the heat dissipation effect of electrical equipment. As is known, the main conductive circuit of the power supply is the main circuit for supplying power to the power supply equipment. Due to the large power flow, equipment burns and disconnection accidents caused by poor electrical connection during operation of the catenary equipment occur. Due to the large scope of damage, the disconnection accident has become the most serious type of accident in various types of accidents in the contact network. With the aging of electrical equipment, there is no reliable monitoring method for the electrical connection state in daily maintenance, which causes such accidents to be effectively controlled, which has a great impact on the power supply.
During the reform of the microcomputer comprehensive safety protection in 2008, the company had an isolation barrier on the isolation transformer and a single-phase overheating of the new isolation substation to cause the knife gate to turn red twice, resulting in no accidents. Panxi Power Plant and Liangda Power Plant within the group company also caused long-term power outages in the power system due to poor electrical connection, which could not guarantee the safe production of the mine. In order to make the electrical equipment overheating phenomenon can be detected in time, the color change temperature monitoring patch is used to monitor the temperature change of the electrical equipment that may cause overheating.
The electrical operation personnel changed from the original inspection equipment every 2h to 4h. The patrol operation personnel checked the temperature of each contact point of the equipment to become one of the main tasks of the operation. Through the inspection of the temperature of each contact point of the equipment, the analysis and judgment were made to detect the defect early. Timely notify maintenance personnel to carry out power outages to eliminate hidden dangers and ensure stable, reliable and safe operation of power equipment.
1 Electrical equipment temperature measurement program demonstration 1.1 Electrical equipment temperature measurement program to determine the current industrial temperature test methods more and more, the most used products are mercury thermometers, infrared thermometers, thermocouples, thermistors, etc., the above methods are large Partially used for conventional thermal measurements, and not too much for temperature measurement on electrical equipment. In March 2009, by consulting relevant materials and investigating the nearby brother power plants, the company's electrical equipment temperature measurement program used color-changing temperature measurement patches. A color change temperature patch is a product that changes color depending on the temperature of the object and thereby grasps the temperature change of the object. The color-changing temperature-measuring patch has a unique color-changing temperature, and has its own self-adhesive. It is applied to the connection part of the indoor busbar of the substation, and can also be attached to the connection between the busbar and the device terminal and the contact of the isolation switch. It can be attached to the outer casing of electrical equipment such as transformers, motors, capacitors, etc., to monitor the temperature of the busbar connection and the electrical equipment enclosure. Once the temperature of the temperature monitoring part reaches or exceeds the rated temperature of the temperature measuring patch, the color changing temperature patch immediately turns from white to red, and it is easy for people to find the temperature rise of the temperature monitoring part during the inspection, thereby finding out the hidden troubles. Prevent accidents from happening.
1.2 Color change temperature patch supplier and model confirmed In April 2009, the company decided to use Beijing Yadongxing Electromechanical Research Institute to select the first color change temperature patch. The corresponding product model is BC type (size 2cmx2cm, each The film is a single temperature; there are various temperatures, each temperature has an over-temperature, white to red, black, green and other varieties, and has a fully enclosed protective film, suitable for indoor and outdoor applications) and digital display eye-catching (size 2.5cmX2.5cm, each piece is a single temperature; has various temperatures; with anti-fouling protective film, stain-resistant, waterproof, the center has a digital display window, after the over-temperature, the white display window presents a white background on a black background, around the square The border color is red).
1.3 The advantages of color-changing temperature-measuring patches are particularly suitable for components that are not or difficult to measure with ordinary thermometers, external surfaces, and objects in life-threatening environments. Temperature measurements such as transistors, integrated circuits, chemical reaction tanks, engine bearings, conductive busbars, switches, connectors, transformers, etc.
Easy to inspect. When the temperature changes, it causes color changes, and people can take measures to avoid accidents and prevent them from happening.
The product is light, easy to carry and easy to install. If the temperature-measuring color patch with self-adhesive is used, it is very convenient to use, and it can be peeled off.
More economical, it saves money compared to other temperature measuring tools when measuring the same number of temperature measuring points.
2 Implementation process of color-changing temperature-measuring patch In August 2009, the maintenance personnel who participated in the project were trained in the use of color-changing temperature-measuring patches.
In the preservation, it is necessary to avoid scraping, scratching, folding or high temperature. If you are unfamiliar, you can use a small knife to shovel it. Don't mess with it and avoid damage.
The temperature measurement part should be relatively clean. It is best to clean it with gasoline or other solvents, or wipe it again so that it can be firmly attached.
When it is attached to a place that can be stained with oil or water, it should be covered with a large piece of transparent tape on the temperature measurement patch to protect it, or use a temperature-measuring patch with a protective film because it has strong oil resistance. Waterproof and anti-fouling function (the white film part of the temperature measuring patch can be discolored if it is directly protected from certain liquids if it is not protected by a protective layer).
If necessary, it can also be charged with electricity. First, stick the patch to the tiny insulated rod on the tip, and push the glued side to the device to easily stick it on the device. Secondly, the scope of use of the company's color-changing temperature-measuring patch was determined: the boiler induced draft fan and the primary fan motor bearing.
The main switch switch of 6kV power distribution.
Isolation knife gate in the small generator room of ~3 machine.
The 1 and 2 partitions for power supply to the mine and the high and low voltage outlet isolation knife for the 4th factory.
Each factory changes the low-voltage isolation knife gate in the low-voltage inlet cabinet.
The above-mentioned electrical equipment has been selected to be more conspicuous and posted according to the use points.
Through the relevant electrical equipment blackout work tickets in August and September and one by one construction, the installation work of the color change temperature stickers of the above-mentioned electrical equipment was completed.
3 Technical change income color temperature measurement patch can faithfully record the process of heating the equipment when the electric inspection personnel are not present. When the inspection shows that the temperature measurement patch is discolored, it definitely indicates that the part has been overheated, and the process of over temperature It may happen now, or it may happen in the past. For example, if the temperature measurement patch is discolored in the inspection, the temperature is measured immediately by the thermometer. Since the ordinary thermometer has no recording function, only the current temperature can be measured, and the temperature of the time that was once over-temperature can not be measured. The measured temperature value is not high, indicating that the temperature of the part has been lowered, but it is also the point of failure. After the application of the color-changing temperature-measuring patch, the electrical operation personnel changed from the original patrol device every 2h to 4h. Although the number of times was reduced, the quality of the inspection was improved.
The cost of installing color-changing temperature-measuring sheet materials on important parts of electrical equipment is only 2,000 yuan, which is low cost, but it has played a big role. After the application of the color-changing temperature measuring piece, the effect is better, which facilitates the inspection of the running electrician. In September 2009, the B-operated electrician discovered the discoloration of the discoloration temperature-measuring patch of the 3-factory variable-voltage side isolation knife. The temperature was measured by the thermometer and found that the temperature reached 239C, and immediately notified the workshop for treatment, avoiding a class of obstacles. The accident happened. In the same month, the A-class operation squad leader found that the junction of the C-phase casing at the incoming line side of the 1st wall was overheated, and notified the electric workshop to carry out maintenance treatment.
During the overhaul, it was found that the fixing bolt could not fix the casing. 4 Factory change due to large load, color change temperature patch paste discoloration, and then the measured temperature value is not high, so re-install the color change temperature patch, and this equipment as the key measurement object, carry out key inspections to prevent accidents .
After the equipment temperature monitoring was realized, the accumulated three-person inspection found that the isolation knife gate was overheated, and four people found that the motor bearing was overheated, and timely organized maintenance personnel to carry out equipment maintenance to ensure the safe operation of the mine power supply and the company's power supply.
Engaged in safety management.
Received deadline: 2011-07-16; repair period: 2011
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