【正文】 nce。 focus on pensation and dispersion pensation bine to spreadbased pensation。 high pensation and low voltage pensation bined with lowpressurebased pensation。 Regulator bined with lower losses,down are the main loss principle. Compensation capacity to determine In the power grid in the reactive power consumption is a big，about 50% of the reactive power consumed in transmission，transformation and the device，50% of the consumed electricity users. In order to reduce reactive power consumption，it is necessary to reduce the reactive power in the grid where flow. The best way to start from the user to increase reactive power pensation，improve user load power factor，so that Generator reactive power can be reduced and the reduction of transmission， transformation and distribution equipment in the reactive power consumption， so as to achieve the purpose of reducing wear and tear. Compensation for reactive power capacity of Qc for Load changes can be decided according to the static or dynamic pensation mode. When the load change is relatively stable，we should use the static method of pensation，which can not only reduce the line losses，and investment。 when the load change is large，dynamic pensation method should be used，stable voltage. Lines，transformer capacity increase Lines，transformer capacity increased ΔS for the Additional pensation device， may improve the power factor， power factor on the business of direct economic benefit is obvious. Because the state electricity system， starting from the rational use of energy， according to the power pany to adjust the price due to high and low values. The pensation device for enterprise and the entire power system economic operation all have significant economic effects . To improve the voltage quality To improve the voltage quality is the dynamic reactive power pensation equipment installed around the role of place in the line voltage pensation has increased slightly . Where tgφ1 pensation device is not installed before the φ1 angle tangent。 tgφ2 pensation equipment installed after the φ2 angle tangent。 R，x line resistance，reactance. Industrial enterprises for the power system problems and solution Fig 1 for a diagram of power supply systems for heavy machine tool plant. At present， the total capacity of the plant transformer 17660kVA， a total of 20 transformers (1 ~ 20， transformers)，each transformer capacity range of 50 ~ 1250 kVA，changing the ratio of 10kV / 014kV. Transformer low voltage side of the load is mainly motor， shown in the M1,M2 Mn shown. In general the rate of transformer load is basically maintained at 28% ~ 29%,and the maximum load of 7000kW. To change the power supply as much as possible to avoid the big horsedrawn cart phenomenon In making our selection， we should consider leaving a certain margin，to prevent heavy damage to equipment when，so most of the time caused by equipment， and severe underrun underrun the formation of the big horsedrawn cart Run. As the plant load factor of the transformer is basically 28% ~ 29%，and shows the transformer capacity is too large，transformer capacity can not be fully utilized， not only a waste of investment in equipment has increased the power loss. Rational choice by the transformer capacity and electrical equipment to reduce or limit the lightload or no load time to prevent the big horsedrawn cart phenomenon. To avoid the noload operation of equipment At present，the plant is running a serious load of some equipment. Improving the power factor，the first consideration should be given a reasonable run the equipment to improve power factor of power the device itself. The plant main load is AC motor， its power factor load with it change， motor idling，the power factor of about ~ between the rated load at ~ between the motor and thus should be made near the rated load state run. We should improve the motor power factor， the simplest way is to use capacitors and electric motors in parallel， so to avoid the noload operation device is to improve the power factor equipment，an important way. he energysaving highvoltage power lines Throughout the year to save electricity ΔW = hWhere l the increase in electric power lines，The number of annual operating hours， whichever 5000h. The calculation of annual energy savings ， within one year to reduce electricity consumption costs million yuan. Transformersaving The loss of main transformer iron loss and copper loss. Transformer secondary side to improve the power factor， can reduce the total load current， thereby reducing the copper loss. Transformer copper loss of the year to save energy ΔW = (ΔPCu1 ΔPCu2) h where ΔPCu1 pensation for the actual runtime before the transformer copper loss of electric power， ΔPCu2 pensated transformer copper loss of electric power， The calculation of annual energy savings 3150kWh， within a year to save electricity transformer copper loss of 173，518 yuan. Power Factor Adjustment tariff Users within a year to reduce spending more than the low power factor penalty: 800 0. 589 5000 % (increase rate) = million yuan of pensation within one year after the users get the power factor bonus: 800 0. 589 5000 % (reduced rate) million total of million yuan from the two above calculations we can see an overall increase within one year of net ine million yuan， according to the capacity required to pensate for equipment investment million yuan,9 months will be able to recover their investments. This shows that the plant foundry for the specific circumstances of the transformer secondary side pensation for use of decentralized approach to reactive power pensation is feasible and can achieve longterm and significant economic effects.工業(yè)企業(yè)無功補償與節(jié)能(譯文)改善工業(yè)企業(yè)用電的功率因數(shù)是提高用電效率、節(jié)約電能的重要手段。本文通過理論分析和應(yīng)用實例說明了工業(yè)企業(yè)無功補償?shù)囊饬x和作用，并針對目前工業(yè)企業(yè)供用電系統(tǒng)存在的問題，提出了改進意見和措施。在工業(yè)企業(yè)中，絕大多數(shù)的用電設(shè)備屬于感性負荷，這些設(shè)備在運行中要吸收大量的無功功率。無功功率的增加使供電