(1) Fragment analysis: The line loss analysis should be carried out according to the voltage class, sub-line, and sub-zone. To grasp the composition of the line loss. Identify weaknesses and make clear directions. (2) Excluding lossless power analysis: After deducting the corresponding sales volume of electricity, such as non-destructive customer-dedicated lines, dedicated distribution transformers, and user-supplied power supply, a statistical analysis was performed to obtain a true line loss rate. (3) Comparative analysis with the historical period: Some electricity loads have a relationship with the season, and they change with the season (such as electricity in agriculture). Moreover, the meteorological conditions in the same period are basically the same, so compared with the values ​​of parameters in the same period of history, there is a great comparability, and problems can be discovered through comparison. (4) Compared with the average line loss rate: An average line loss rate for a long period of time can eliminate line loss fluctuations caused by factors such as load changes, time changes, and meter reading time differences. This average line loss rate can reflect the actual condition of the line loss. Compared with the average line loss, it can be found whether the line loss at that time is abnormal. 〔5) Comparison with theoretical line loss: The actual line loss and the theoretical line loss of the size of the deviation. Can see the management gap, can analyze the possible problems. Wells combined with other analytical methods to identify problems in management. Then take appropriate measures to resolve. (6) Energy balance analysis: Comparison of metering and sub-meter electricity. It is used to supervise the operation of energy metering equipment and the energy consumption of substations themselves. This is a very effective analysis method. This activity is often carried out to identify problems in a timely manner and take timely measures to keep metering devices in normal operation. . (7) Compared with advanced level: Comparing the completion of line casting with the surrounding units. Can find the unit in the power grid structure and management gap. An electric drill is a drilling tool that uses electricity as power. It is a conventional product in power tools, and it is also the most demanded power tool product. The annual production and sales volume accounts for 35% of China's power tools. Electric Cordless Impact Drill,High quality electric drill,21V Custom Powered Electric Drill,Powered Electric Cordless Impact Drill Shijiazhuang Longshu Mechanical & Electrical Equipment Trading Co., Ltd. , https://www.lsjgbearing.com
The main specifications of electric drills are 4, 6, 8, 10, 13, 16, 19, 23, 32, 38, 49mm, etc. The number refers to the maximum diameter of the drill bit for drilling on steel with a tensile strength of 390N/mm2. For non-ferrous metals, plastics and other materials, the maximum drilling diameter can be 30-50% larger than the original specification.
Principle:
The working principle of the electric drill is that the motor rotor of the electromagnetic rotary or electromagnetic reciprocating small-capacity motor performs magnetic field cutting and work operation, and the operating device is driven by the transmission mechanism to drive the gear to increase the power of the drill bit, so that the drill bit scrapes the surface of the object and penetrates the object better. .
Application:
1. Construction and Industry
It is widely used in the reinforcement of building beams, slabs, columns, walls, etc., decoration, wall installation, brackets, railings, billboards, air conditioner outdoor units, guide rails, satellite receiver elevators, steel structure workshops, etc.
2. Medical applications
(1) Dental:
At the beginning of the 20th century, a wall-mounted three-bend dental drill appeared, with a speed of 4000 r/min, and some even reached 10,000 r/min. The rope wheel-driven three-bend dental drill that we are still widely used is its derivative. thing.
(2) Otology:
Julius Lempert, the father of modern otology, pioneered the use of electric drills for ear surgery in New York in 1938 to treat chronic ear diseases and reduce the incidence of facial nerve damage. But the electric drills of the time were difficult to control and were very noisy. Modern electric and air drills greatly increase the rotational speed and enhance the cutting capacity. The use of fast cutting drills, diamond drills and irrigation-suction systems enables otologists to quickly complete accurate surgical dissections and greatly reduce operating time.
3. Marine flexible rod drill
The utility model relates to a new type of marine drilling equipment, which is mainly used for coring and sampling of the bottom layer of the seabed, and exploration of marine geology and minerals. First, it was successfully developed by the French Institute of Petroleum (IFP). It was initially used to drill 300-meter and 500-meter boreholes on land, and later cooperated with the Soviet Union to drill oil wells up to 3,000 meters deep. In 1965, it was successfully tested at sea for the first time, and the drilling depth reached 2,500 meters. ECSM offshore flexible rod coring drill is to install the flexible rod, electric drill, coring tube, drill bit and submersible pump on the same frame, lower it to the seabed with wire rope, and supply power from the ship surface through the cable to realize remote control drilling. It can drill up to 100 meters in water depth of 500 meters and take out 3.5 inches of core. The machine weighs about 10 tons.