低压

Using low voltage vacuum circuit breaker and air circuit breaker, the low voltage electric circuit having the functions of frequently setting up and on and protecting was designed.

应用结果表明，以低压真空断路器和空气断路器为中心，设计的低压供电部分，可满足试验系统频繁分和与保护的要求。

DW450 Low Voltage Air Circuit Breaker is a new generation of digitalized and communicative intelligent type ACB jointly by Shanghai Institute of Electric Science and Research Co.

DW450低压万能式断路器是上海电器科学研究所有限公司联合国内有关企业共同开发的新一代数字化可通信智能型低压万能式断路器。

Urban systems generally use a large number of low-pressure valves, and to the development of environment-friendly and energy-sing, that is used in the past low-voltage iron gate valve and gradually turn to environment-friendly plastic sheet valve, balance valve, metal sealed butterfly valve and the transition of the center line butterfly valve seal .

城建系统一般采用大量低压阀门，并且向环保型和节能型发展，即由过去使用的低压铁制闸阀逐步转向环保型的胶板阀、平衡阀、金属密封蝶阀及中线密封蝶阀过渡。

Urban systems generally use a large number of low-pressure valve, and to environmental protection and development of energy-saving, that is, by the use of low pressure over the last steel valve towards environment-friendly plastic valve, balance valve, metal sealed butterfly valve and the center line butterfly valve seal transition, oil and gas to the pipeline of development projects, which in turn requires a large amount of flat gate valve and ball valve

2城建系统一般采用大量低压阀门，并且向环保型和节能型发展，即由过去使用的低压铁制闸阀逐步转向环保型的胶板阀、平衡阀、金属密封蝶阀及中线密封蝶阀过渡，输油、输气工程向管道化发展，这又需要大量的平板闸阀及球阀

And its current products mainly include fuses, fuse combination switches, cable distribution cabinets, electronic surveillance systems and power management systems, and etc.

最先进的全自动化生产线保证其产品品质，目前产品包括熔断器，熔断器组合开关，低压配电系统，低压电器元器件，电子监控系统及电能管理系统等。

When entering the diaphragm pressure on the top of the control room to the atmosphere or water by the downstream area of low pressure, the role of the bottom plate in the valve and the pressure below the diaphragm on the pressure value is greater than the top, so the main valve disc to the fully open position; when entering the diaphragm pressure above the control room can not water the lower reaches of the atmosphere or area of low pressure, the role of the diaphragm on the top of the pressure value is greater than the pressure below the value, so will the main valve pressure valve set to fully closed position; when the diaphragm pressure above the value of the control room at the entrance of the middle pressure and outlet pressure, the main valve in the regulator valve on the disk, and its regulation depends on the location of the needle-catheter system and adjustable valve guide of the role of joint control.

当阀门进入隔膜上方控制室内的压力水被排到大气或下游低压区时，作用在阀盘底部和隔膜下方的压力值就大于上方的压力值，所以将主阀阀盘推到完全开启的位置；当进入隔膜上方控制室内的压力水不能排到大气或下游低压区时，作用在隔膜上方的压力值就大于下方的压力值，所以就会把主阀阀盘压到完全关闭的位置；当隔膜上方控制室内的压力值处于入口压力与出口压力中间时，主阀阀盘就处于调节状态，其调节位置取决于导管系统中的针阀和可调导阀的联合控制作用。

When entering the diaphragm pressure on the top of the control room to the atmosphere or water by the downstream area of low pressure, the role of the bottom plate in the valve and the pressure below the diaphragm on the pressure value is greater than the top, so the main valve disc to the fully open position; when entering the diaphragm pressure above the control room can not water the lower reaches of the atmosphere or area of low pressure, the role of the diaphragm on the top of the pressure value is greater than the pressure below the value, so will the main valve pressure valve set to fully closed position; when the diaphragm pressure above the value of the control room at the entrance of the middle pressure and outlet pressure, the main valve in the regulator valve on the disk, and its regulation depends on the location of the needle-catheter system and adjustable valve guide of the role of joint control.

当进入隔膜上方控制室内的压力水被排到大气或下游低压区时，作用在阀盘底部和隔膜下方的压力值就大于上方的压力值，所以将主阀阀盘推到完全开启的位置；当进入隔膜上方控制室内的压力水不能排到大气或下游低压区时，作用在隔膜上方的压力值就大于下方的压力值，所以就会把主阀阀盘压到完全关闭的位置；当隔膜上方控制室内的压力值处于入口压力与出口压力中间时，主阀阀盘就处于调节状态，其调节位置取决于导管系统中的针阀和可调导阀的联合控制作用。

This paper introduces developing and tendency of marine low-pressure fire extinguishing system,gives comparison of advantages and shortages between high pressure and low-pressure CO 2 fire-extinguishing systems ,which will become reference to accept this new technique.

文章全面介绍了新兴的低压CO2 灭火系统的发展情况和发展趋势，比较了高压CO2 灭火系统和低压CO2 灭火系统的优缺点，为国内同行将来接触这种新技术提供借鉴。

I plant strong technical force, advanced technological equipment, complete detection means, and vigorously develop new products and continuously enhance the technical grade of the old product, one of the new product has high anti-corrosion of aluminum alloy bridge, flame retardant cable bridge, MZS-type low-voltage combinations switching cabinets, low-voltage flame retardant type air insulated busbar trunking system closed, the computer temperature control products, the above products have been mass production into the market and has strong technological advantage and market competitiveness, customer much good praise.

我厂技术力量雄厚，工艺设备先进，检测手段完备，大力开发新产品，不断提高老产品的技术档次，其中新型产品有高防腐的铝合金桥架，阻燃型电缆桥架，MZS型低压组合式开关柜，低压阻燃型空气式封闭绝缘母线槽，计算机温控产品，上列产品均已批量生产投入市场，具有较强的技术优势和市场竞争力，倍受客户良好赞誉。

Based on analysis of the features of three-phase four-line power supply system and nonliear load current harmonic pollution,compensation method of simultaneously compensating voltage sag and synthetic power quality of load low-voltage of harmonic current was proposed,and corresonding hybrid unified power quality compensator was also designed.

通过对三相四线制供电系统的特点和非线性负载电流谐波污染分析，提出了可同时补偿电压跌落、谐波电流的负载端低压综合电能质量补偿方法，并设计了对应的混合型低压电能质量综合补偿器。

Cynanchum Lingtai apricot production in the average weight 65 grams, the brightly-colored fruit, juicy rich, sweet-sour taste, sweet from the nucleolus, when the late Qing Dynasty famous Shaanxi, Gansu provinces, the Qing imperial court Tongzhi tribute for years.

灵台生产的牛心杏平均单果重65克，果实色泽鲜艳，汁多味浓，甜酸适口，离核仁甜，清末时就驰名陕、甘两省，清同治年间曾为朝廷贡品。

Chenopodium album,Solanum nigrum, and Amaranthus retroflexus were very susceptible to the herbicides. Polygonum persicaria and Abutilon theophrasti were relatively less susceptible to the herbicides, and Lycopersicon esculentum was not susceptible to it. The relationship between reduction rates of weed biomass and PPM values of weed leaves 2,4, and 6 days after treatment was established.

供试的6种杂草对该混剂的敏感性存在显著差异：红心藜Chenopodium album、龙葵Solanum nigrum和反枝苋Amaranthus retroflexus对该混剂最敏感，ED90值分别为47.65、71.67和29.17g/hm2；春蓼Polygonum persicaria和苘麻Abutilon theophrasti敏感，ED90值分别为96.91、114.20g/hm2；而番茄不敏感。