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Computer design and outlook of coal


Significantly improved. If accompanied by a pressure grouting rock mass, increasing the compressive strength of rock itself,[link widoczny dla zalogowanych], support better results. 2. Reasonable and in the short to anchor bolt layout, form a long in the short (or medium and small) junction station anchorage system, will greatly enhance the anchoring effect. 3. Reinforcement of the floor is essential,[link widoczny dla zalogowanych], especially in rotating equipment Chamber. More important than other parts of the floor,[link widoczny dla zalogowanych], ignoring the disastrous consequences of this problem, which has been proved by the conclusion. _ U absolutely do not ignore the mouth. Through the identification of geological mapping software developed by Chongqing Coal Design & Research Institute \The software uses the whole section filled way. List of different lithology of bedrock mapping symbols, line 8, in the domestic exploration industry in the lead, and automatically calculate the drawing, nearly 10 times to improve efficiency, the promotion of great value (severe hospital Yuan Yonghua) the total resistance should not be large 20. Determination of neutral grounding resistors principles. From the control connection 'to the current condition of selected low-voltage line when the general-to-ground fault current selection is not greater than 15A, but not fault current limit is too small, that is, the capacitor should not be less than the current distribution network in order to avoid instantaneous change over voltage. . General resistance by the current through the neutral point slightly larger than the system capacitive current, the IR ~ 3Ico selected. Preparation of the mouth, Kowloon, calculated according to the principles of neutral grounding resistance, the main transformer for the plant each song is about 50O, installed storage system 700n so. Of course, the actual installation should be adjusted according to actual situation. When given the current neutral grounding resistors, resistance, voltage parameters, you can choose according to their resistors. With neutral point resistance grounding system, and compatible with current-use leak protection, the system has a good selective protection, effectively improve the security of personal electric shock to make the system safe and reliable operation. Three complete sets of electric foot mouth of Coal I is the Kowloon industrial and mining enterprises in China with 660V power supply ground of the second pilot plant, in the design phase of amorphous sets of electronic control devices. To meet the needs of the design, preparation plant equipment according to the circumstances and different sizes of coal preparation plant, the characteristics of different types of devices, learning from the first pilot plant (choose four mine in Yangquan noise factory) on the basis of experience, we designed mining Enterprise Ground 660V complete electric control device. The equipment,[link widoczny dla zalogowanych], including by electronic counters, cabinets by electricity and feed, contact and feed cabinets, motor control cabinets, counter reactive power compensation. To meet the small-capacity equipment and lighting control needs also set 660/380/220V auxiliary power supply cabinets, neutral grounding resistor box, wound rotor control box and so on. Preparation of this device has been in the Kowloon port fully operational, including power distribution cabinet of about 80 surface, distribution box 9 units, wound rotor control box 8. All products are low-voltage switchgear plant in Shenyang. After industrial operation, the system safe and reliable. Apart from a small number of very good quality electrical components, the other is operating normally. Handan Coal Design & Research Institute and the low-voltage switchgear plant in Shenyang Coal container port in Kowloon on the basis of shelf-screen joint development of the GPDl, GPD2, XPD1 series of new 660V electrical control equipment. The main features of electronic control devices are; 1. Electrical components are selected through a newly developed 660V 660V test or replacement products. 2. GPD1, GPD2 Series power distribution cabinet table with profiles bolt group structure, with assembly of high precision, structural stability and protection and good performance. 3. Series than the flush, not only to meet the power needs of coal preparation plant, also applies to the metallurgical and mining of petroleum and chemical industry. Complete electronic control panel on the device details, see Handan Coal Design & Research Institute and Shenyang series of low-voltage switch factory homes \660V power supply system and the complete pilot plant efforts by all parties has been to successful conclusion. By the Department of Energy,[link widoczny dla zalogowanych], Energy Secretary and the coal mines Corporation Technology Development Council chaired ~ April 1992 was held in Shenyang Coal 660V power supply system and electric control device sets appraisal. Identification Committee \And pointed out that: \Coal 660V power supply system in the design and implementation process encountered some problems, such as OEMs supporting and complete set motor type is not flexible to adapt to the flexible cable 660V not production. But with the continuous development of science and technology, these problems can be solved. 660V power supply system will gradually widely in industrial and mining enterprises to promote use.
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