All electrical products must rely on electrical energy to drive, but the main energy is the conversion of electrical energy into heat to generate power to drive electrical equipment, electrical equipment, heating is the greatest potential threat to the safe operation of the equipment, if not timely detection and processing, when the heat a long time If it is serious, it may cause the device connection point to be blown or damaged, which is very close to or directly caused by the accident. The author through the analysis of the cause of the explosion of the operation of the explosion-proof operation column equipment, combined with practical work experience, put forward the monitoring method of running equipment heating and some effective prevention methods!
Explosion-proof operation column (electrical) equipment causes heat: When the equipment is working, due to the effect of voltage and current, it will produce resistance loss heat. The heat generation under the permissible load occupies a large proportion in the equipment operation failure, so it is also one of the major failures of the electrical equipment. Thermal failures can lead to insulation thermal breakdown of electrical equipment, thermal deformation of the conductor connection, and even welding, which seriously threatens the safe operation of electrical equipment.
First, strengthen inspections, make electrical temperature measurements, and discover potential risks in a timely manner. In summer, the weather is hot and there is inertia in personnel inspections. It is necessary to establish a sound electrical inspection system and to restrict the inspection personnel. This includes inspection time, content, records, and frequency. Scientifically and reasonably arrange the inspection time and inspection frequency of electrical management, electrical operation and electrical maintenance personnel to minimize the inspection blind spot; the inspection personnel must be responsible and responsible for checking the integrity of all electrical equipment and accessories and check whether the preparation machine is in good condition. Normally, pay attention to each motor, switch, cable, temperature, sound, voltage, current, and whether it is normal, and establish a temperature record in the power distribution room. Each class measures the temperature of the electrical equipment in the branch and records the related problems. It is necessary to report and process the information step by step in order to effectively ensure the safe and stable operation of electrical appliances.
Second, do a good job in the summer to check the work of the electrical power connector (in this recommend a flexible connection fittings with flame-retardant rubber sheathed flexible connecting pipe). The electrical connector mainly includes the wiring of the motor, the upper and lower wiring of the circuit breaker inside the high voltage cabinet, the wiring of the isolated knife gate, the switch of the low voltage cabinet, the circuit breaker, the contactor, etc. The fastening of these electrical connectors and the safe operation of the electrical appliance Closely related. It is well known that there are phenomena of thermal expansion and contraction of electrical connectors. As the temperature changes, there will be hot spots, loosening of fasteners, and poor contact of connectors. This has become a “stumbling block†for the safe and stable operation of electrical appliances. Every year in April and May, our company will conduct a comprehensive inspection. This is the time for the connection of the electrical supply line connection components. Secondly, the daily inspection of the connector of the electrical equipment is also very necessary. Check and fasten the main connecting parts in reverse parking, open the crimped parts of the connecting parts to check whether there is an oxide layer, and find that the oxide layer should be polished in time. When the wear of copper or copper contacts is more than one-third of the damage, the copper should be replaced.
Third, do a good job of outdoor electrical protection, measure the insulation regularly, and make recommendations for long-term insulation and low maintenance. Rainy weather is also a kind of verification for the protection of outdoor electrical appliances and motor insulation. Electrical protection, especially electrical appliances, is particularly critical for rain protection. Humidity in rainy weather is relatively high, which can easily cause electrical short circuits and electrical leakage. At the same time, severely aged motors can easily absorb moisture. Causes the insulation of the motor to drop. On the one hand, electrical protection should promptly close the field control box door to ensure that the electrical protection cover is in good condition and the protection cover does not leak or rain. On the other hand, the insulation of the electrical equipment must be ensured. To standby, for the safe and stable operation of the appliance also plays a role that can not be ignored, which requires us to regularly measure the insulation of the electrical equipment preparation, especially the insulation of the hot spare equipment, and the insulation measurement of the rainy weather preparation equipment should be more appropriate than usual. Increase the frequency, recommend long-term non-insulated electrical equipment to go out for maintenance, to ensure long-term safe backup equipment.
Fourth, do a good job of cleaning the electrical and power supply cabinets. Hot and humid weather is a threat to the stable operation of electrical appliances. There are more dust deposits on electrical equipment. Power supply lines and power supply equipment can cause short circuit, creepage, and discharge of electrical equipment. Running electrical equipment can cause poor heat dissipation. Insulation and other conditions occur. This requires us to regularly clean up the dust deposits on the power supply lines and power supply equipment. Check the cleaning of the motor, especially the open type motor, before the summer season to ensure the good heat dissipation of the electrical appliances.
There are many kind of refrigerating units, according to the volume type compressor including the following kinds:
1. According to the shape of compressor which is volume, can be divided into piston type and rotary type two kinds, at present, the piston type including full close and semi closed type compressor and rotary type including screw and scroll compressor. Generally, the scroll compressor is known as full closed compressor.
2. According to the number compressor units is divided into two kinds: single refrigeration unit and parallel refrigeration unit.
3. According to the condensing unit, it divided into air cooling and water cooling Compressor Unit.
4. According to the cooling media, it divided into fluorine refrigeration unit, ammonia refrigeration unit and water cooling unit.
The features:
This refrigerate unit is cabinet shape, structure tight, good performance;
This refrigerate unit is semi. Closed compressor unit, small vibration,low noise, and credible in operation.
With cooper,aluminum heat transformer, big air transit area, high heat transfer rate and long life period.
With outside rotating fan, low operation sound.
With inside wire connection box.