Leakage protection is one of the three major protections of coal mine underground electric appliances, and the reliability of its protection affects the safety production of coal mines. The current principle of selective leakage protection for low-voltage feed switches is still based on zero-sequence voltage and zero-sequence current protection methods; in addition, external DC is used to continuously monitor the insulation of power supply networks. Due to the extension of the power supply network and the use of shielded cables, and the application of power electronic devices such as explosion-proof electrical appliances, etc., the downhole power supply network is complicated, there are many spurious in the selective leakage protection, the uncertainty of distributed capacitance, these are There is a requirement for leakage protection. The use of advanced digital acquisition technology, how to analyze the distribution of underground capacitive conditions, and achieve accurate selective tripping trip fault branch without affecting other work branches, to ensure reliable and safe underground power supply is also a new subject in urgent need of research.
Mine AC Explosion Proof Electrical Product Development
Due to the continuous advancement and development of science and technology, high-power electronic appliances are rapidly developed in downhole applications. Among them, AC frequency converters have the advantages of high efficiency, low failure rate, and good control performance, which can significantly improve the production process. Due to the attention of the coal mining industry, the mining frequency conversion speed control device was mainly used for the speed adjustment of about 100 kW for coal mining and electro-mechanical traction components. Generally, there is a dedicated transformer for power supply in the front stage, which has little impact on the grid. However, with explosion-proof electrical technology continues to mature, from the last century, the successful use of electric traction shearer began in the 1980s, coal mining equipment, such as ventilators, winches, hoists, air compressors and other mechanical equipment have begun to use frequency control technology, Not only changes in the traditional production process, but also mainly reflected in energy efficiency. For example, the selection of the main fan of the mine is based on the maximum air flow requirement for the production and service period of the mine. From the time of well construction to production until the mine is scrapped, the amount of air to be used in each period is different, and the difference is very large. The use of mechanical adjustment of the air volume results in a large amount of electrical energy wasted. Fans use explosion-proof electrical technology to save energy is very impressive; and if the local exhaust ventilator on the mining face has many installation sites and long running time, it is a large energy consumer. As the coal mining continues to expand, the amount of air required for a longer period of time is much smaller than the ventilation. The air supply capacity of the machine is based on the current status of this large horse-drawn vehicle, and the energy-saving effect of adopting the frequency conversion speed regulation technology is also very obvious. Due to the high efficiency of explosion-proof electrical appliances and good speed control performance, electrical braking and stepless speed regulation can be used to save energy. It is an inevitable trend to use frequency conversion technology more widely in coal mines. However, at present, both product development and detection technologies cannot keep pace with the needs of production development.
According to the application experience of the ground frequency conversion speed control device, we must make good use of the frequency conversion speed control device, we must take the power supply, explosion-proof electrical machine motor, production machinery combined production process as a system to study, take appropriate restraint measures on the harmonic of the power grid. In order to adapt to the development of variable frequency electrical technology in coal mines, study the technical performance of high-power frequency conversion equipment for mines, the research of explosion-proof electrical equipment EMC and the effect of wave suppression measures, and provide a technologically advanced technology for mine explosion-proof electrical technology research, design and production. The test platform is imminent.
Mine AC Explosion Proof Electrical Product Development
Due to the continuous advancement and development of science and technology, high-power electronic appliances are rapidly developed in downhole applications. Among them, AC frequency converters have the advantages of high efficiency, low failure rate, and good control performance, which can significantly improve the production process. Due to the attention of the coal mining industry, the mining frequency conversion speed control device was mainly used for the speed adjustment of about 100 kW for coal mining and electro-mechanical traction components. Generally, there is a dedicated transformer for power supply in the front stage, which has little impact on the grid. However, with explosion-proof electrical technology continues to mature, from the last century, the successful use of electric traction shearer began in the 1980s, coal mining equipment, such as ventilators, winches, hoists, air compressors and other mechanical equipment have begun to use frequency control technology, Not only changes in the traditional production process, but also mainly reflected in energy efficiency. For example, the selection of the main fan of the mine is based on the maximum air flow requirement for the production and service period of the mine. From the time of well construction to production until the mine is scrapped, the amount of air to be used in each period is different, and the difference is very large. The use of mechanical adjustment of the air volume results in a large amount of electrical energy wasted. Fans use explosion-proof electrical technology to save energy is very impressive; and if the local exhaust ventilator on the mining face has many installation sites and long running time, it is a large energy consumer. As the coal mining continues to expand, the amount of air required for a longer period of time is much smaller than the ventilation. The air supply capacity of the machine is based on the current status of this large horse-drawn vehicle, and the energy-saving effect of adopting the frequency conversion speed regulation technology is also very obvious. Due to the high efficiency of explosion-proof electrical appliances and good speed control performance, electrical braking and stepless speed regulation can be used to save energy. It is an inevitable trend to use frequency conversion technology more widely in coal mines. However, at present, both product development and detection technologies cannot keep pace with the needs of production development.
According to the application experience of the ground frequency conversion speed control device, we must make good use of the frequency conversion speed control device, we must take the power supply, explosion-proof electrical machine motor, production machinery combined production process as a system to study, take appropriate restraint measures on the harmonic of the power grid. In order to adapt to the development of variable frequency electrical technology in coal mines, study the technical performance of high-power frequency conversion equipment for mines, the research of explosion-proof electrical equipment EMC and the effect of wave suppression measures, and provide a technologically advanced technology for mine explosion-proof electrical technology research, design and production. The test platform is imminent.
Customized Vacuum Nutsche Filter
Customized Vacuum Nutsche Filter means Zhongyi Kori equipment factory can customized nutsche filter with PTFE Coating , Customized glass nutsche filter with cover , customized nutsche filter with stainless steel lid , customized nutsche filter with collection flask , customized nutsche filter with filter paper
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