1, the use of reactive power compensation equipment to improve the power factor Under the condition that the active power P of the load remains the same, increasing the power factor of the load can reduce the reactive power Q required by the load, thereby reducing the reactive power sent by the generator and the reactive power passing through the line and the transformer , Reduce active power and loss of power in lines and transformers. 2, to upgrade the grid Under the condition of constant load power, the part of load loss in the grid components decreases with the increase of the voltage level. Increasing the grid voltage, the current passing through the grid components will be reduced correspondingly and the load loss will also decrease. Boost is a very effective measure to reduce line losses. Boost transformation can be combined with the transformation of the old power grid to reduce the voltage level, reduce repeated substation capacity, simplify the wiring of the power grid and meet the needs of load growth, so as to significantly reduce the power loss of the power grid. Specific measures can have the following. Shunt load, reducing the current density of the line. Utilize the remaining outlet interval of the substation to divert the high load and high loss lines and reduce the line loss by increasing the number of line exits to reduce the line loss. Adjust load center to optimize grid structure. In order to shorten the power supply radius for the problems of less distribution of power supply and longer power supply radius in the rural 10kV distribution network, a new station and an old station reconstruction are adopted to shorten the power supply radius. In the rural low-voltage distribution network, small capacity, dense distribution and short Radius way to achieve the purpose of saving. On-load voltage transformer, to adjust the voltage in a timely manner, the voltage often maintained within the acceptable range. The impact of distribution transformer loss on line loss plays a decisive role. In the rural power grid caused by distribution of non-economic operation of the main reason is the product model, the capacity of inappropriate choice, the installation location is not appropriate; operating factors such as rural electricity load there is seasonal strong peak difference, the use of low hours, the whole Young or even empty for a long time, poor management and so on. Reasonable selection and adjustment of distribution transformer capacity, with the distribution of average load factor is the focus of the distribution network to reduce damage. 3, improve the measurement accuracy Replacement of the meter to reduce the loss of measurement, the positive use of error is good, high accuracy, low starting current, overload capacity, anti-tilt, anti-theft, meter reading can be automated management and low table loss of all electronic energy meter , Improve measurement accuracy, set reasonable measurement points, green line users to install replacement pressure loss recorder, and promote the use of a wide range, high-precision electronic energy meter, for some users to install IC card table, to eliminate the impact of human factors, Timely investigation of various measurement errors at the scene. Promote the use of centralized meter reading system, remote users and residents to achieve meter reading. Daily copy of the newspaper should be timely accounting for the month whether the power factor of 0.9 or more, should consider the use of high voltage compensation measures. For large users can be equipped with time-billing of reactive energy meter, the peak hours of the power factor assessment. Improve the layout of unreasonable lines to eliminate near-electric supply, detour back phenomenon, to reduce circuitous lines and shorten the length of the line. For long-running, small diameter, high loss of the line replacement of large cross-section of the wire. Update high damage main transformer, use energy-saving main transformer. The main transformer should run according to the economic operation curve. Two main transformers should be equipped with one or two main transformers according to the load condition, and the operation should be carried out in time and separately.
The cold working methods of steel pipes mainly include cold drawing and cold rolling. The raw materials of cold-rolled steel pipes can be hot-rolled seamless steel pipes or welded pipes. The common characteristics of the cold working method of steel pipes are high dimensional accuracy and good surface roughness. It can produce very thin (up to 0.05~0.01mm) thin-walled tubes and very thin (up to 0.3~0.1 mm in diameter) capillaries.
Precision Steel Tube,Cold Drawn Steel Pipe,Cold Rolled Steel Pipe,Precision Seamless Tube Shandong Guanzhou Iron and Steel Group Co., Ltd. , https://www.guanzhouiron.com
Generally, the production process of seamless Steel Pipe can be divided into cold rolling and hot rolling. The appearance of cold-rolled seamless steel pipe is shorter than that of hot-rolled seamless steel pipe. The wall thickness of cold-rolled seamless steel pipe is generally smaller than that of hot-rolled seamless steel pipe. But the surface looks brighter than that of thick wall seamless steel pipe. The surface is not too rough, and the diameter is not too much burr.
In order to obtain seamless pipes with smaller size and better quality, cold rolling, cold drawing or a combination of the two methods must be used.
High precision cold drawn precision steel pipe is a new type of steel pipe, which is mainly characterized by high precision. There are usually two production processes of two high mill and three high mill. The precision of three high mill in producing cold rolled seamless steel pipe is higher, which can be controlled within a few wires, but the price is relatively higher.
The product specification range of cold rolled steel pipe is: outer diameter 4.0 ~ 450mm; The wall thickness is 0.04 ~ 60mm. Compared with the cold drawing method, the advantage of the periodic cold rolling method is that the shrinkage of the pass surface is large, there is no need for difficult head, and the yield is high.
Technical Measures for Reducing Line Loss in Power Grid