工频

A mathemetical model of magnetic field in electromagnetic separation of inclusions from molten aluminum under rectangle coil and 50Hz current is presented according to the magnetic vector potential integral equation and the basic theory of magnetohydrodynamics. The magnetic field distribution in the gap of coils is simulated by the model and the actual magnetic field distribution also is measured. The experimental results show that the magnetic field distribution in the gap of coils is uniform and is consistemt with the model simulation. The magnetic field designed accord the simulated result is proved suitable in the practice.

摘 要：根据电磁流体力学的基本理论，利用矢量磁位积分，建立了在采用矩形电磁线圈和工频电源的条件下电磁分离铝熔体中夹杂的电磁场数学模型，模拟计算了电磁感应线圈气隙中的磁场分布状态，同时对制做的感应线圈的实际磁场进行了测量模拟计算磁场的分布状态与实际磁场的测量结果基本一致，都表明在电磁感应线圈气隙中磁场分布均匀，可以进行分离铝熔体中的非金属夹杂。

Major equipment has seven tons of hot air cupola 1, 3-ton cupola 2; 1 ton-frequency furnace 1; 10 tons lane 2, 5 tons lane 3; Q378C blast cleaning machine 1; S1120, S118, S111 type mixer and the resin sand Mixer 1; ZNVSR-vibration system to eliminate stress 1; drying kiln and the annealing furnace 1, and other wood-based and aircraft plus 16 sets of equipment, and the other physical and chemical room with a professional .

主要设备有7吨热风冲天炉一座，3吨冲天炉2座；1吨工频炉1座；10吨行车2台，5吨行车3台；Q378C抛丸清理机1台；S1120、S118、S111型混砂机和树脂砂混砂机各1台；ZNVSR-振动消除应力系统1台；烘干窑和退火炉各1台，其他木型和机加设备16台套，另设有专业理化室。

On the basis of analysis and comparison of conventional and some modern dielectric loss measurement methods in this paper, considering the difficulty consist in the dielectric loss measurement, such as the problem of the locale measurement of dielectric loss the suffering the interference of the electric field in the electrified wire net, the influence of harmonics and the leakiness of frequency spectrum due to the change of the frequency in power supply etc. a new measurement method which the frequency conversion anti-jamming technology combines the fundamental waves phase detachment method is presented.

论文在分析了传统介质损耗测量方法和现代介质损耗测量方法的基础上，针对介质损耗检测中存在的技术问题，如现场测量时工频电网强电场干扰问题、高次谐波影响问题、供电电源频率改变所引起的频谱泄漏和栅栏效应等问题，提出了采用变频抗干扰技术和基波相位分离法相结合的新型测量方法。

In the example, some artifacts as the independent components such as base line drift and 50Hz power frequency interference are extracted successfully to some extent.

本文并通过对存在基线漂移和工频干扰的心电图信号进行独立分量分析的结果说明了这一思想。

The GYG-1-240 energy conservation power frequency has the core smelting furnace, mainly uses in smelting the carbon steel, metals and so on alloy steel, high-manganese steel, ferroalloy, cast alloy iron, gray iron, copper, copper alloy smelts, because the furnace temperature is higher than 1600℃, and has six grade of temperature controls, suitably in 1250-1600℃ the different melting point metal's smelting, and may fall the files heat preservation to wait for the casting or the adjustment melt fluid ingredient, the electromagnetism magnetic field magnetic line of force automatic agitation causes the ingredient to be even, non-element loss by burning.

GYG-1-240节能型工频有芯熔炼炉，主要用于熔炼碳素钢，合金钢、高锰钢、铁合金、合金铸铁、灰铸铁、铜、铜合金等金属熔炼，由于炉温高于1600℃，并有六档温度调节，可适用于1250-1600℃不同熔点金属的熔炼，并可降档保温等候浇铸或调整熔液成份，电磁磁场磁力线自动搅拌使成份均匀，无元素烧损。

The GYG-1-240 energy conservation power frequency has the core smelting furnace, mainly uses in smelting the carbon steel, metals and so on alloy steel, high-manganese steel, ferroalloy, cast alloy iron, gray iron, copper, copper alloy smelts, because the furnace temperature is higher than 1600℃, andhas six grade of temperature controls, suitably in 1250-1600℃ the different melting point metal's smelting, and may fall the files heat preservation to wait for the casting or the adjustment melt fluid ingredient, the electromagnetism magnetic field magnetic line of force automatic agitation causes theingredient to be even, non-element loss by burning.

GYG-1-240节能型工频有芯熔炼炉，主要用于熔炼碳素钢，合金钢、高锰钢、铁合金、合金铸铁、灰铸铁、铜、铜合金等金属熔炼，由于炉温高于1600℃，并有六档温度调节，可适用于1250-1600℃不同熔点金属的熔炼，并可降档保温等候浇铸或调整熔液成份，电磁磁场磁力线自动搅拌使成份均匀，无元素烧损。

The waveform of differential current in each data window is divided into four parts averagely according to time, and the area-ratio among the four parts can be used to distinguish magnetizing inrush from internal fault current.

该算法以工频一周波为数据窗长，将数据窗内的差流波形按时间均分为4份，根据各份面积之间的比值来识别励磁涌流和内部故障电流。

In our copper smelting plant, we have advanced mains frequency induction melting furnace, hot extrusion equipment, vacuum annealing furnace and advanced detection instruments. So that we can re-processing of the waste out of high-quality brass materials and raw materials Costs are in a better position.

我们的铜材熔炼厂，配备了先进的工频熔炼炉，大型热挤压设备，真空退火炉及先进的检测仪器，使我们的废料可以再加工出高品质的黄铜材料，我们的原材料成本必然更具优势。

2TheMax GPX750 PSU for the desktop computer features total output of 750W, rated supply voltage of 115V to 230V auto range, rated mains frequency of 47 to 63 Hz, rated input of 115V at 10A or 230V at 5A, efficiency of 85% minimum at typical load, holdup time of 16.6ms at nominal line under full load condition, power good signal between 100ms to 500ms, over current protection at 110% to 150% individual output power, over voltage protection for +5V is between 5.8V to 6.3V,+12V from 14V to 17V, 3.3V from 3.6V to 4.2V, air flow by DC fan, operating temperature of 0°C to 50°C and operating humidity of 20% to 90% non-condensing.

2themax gpx750电源为桌上型电脑的功能总产量750瓦特，额定电源电压115v到230v汽车范围，额定工频47至63赫兹，额定输入的115v在10 A条或230v在5 ，效率85 ％，最低在典型负载，持的时间16.6ms的名义在网上下，满负荷条件下，电源良好信号之间的100 ms到500ms ，过电流保护在110 ％至150 ％个别的输出功率，过电压保护，为5 V是之间的5.8 V至6.3v ，+12 V的从14v至17v ，电压为3.3 V从V到3.6 V至4.2 V ，空气流量由直流风扇，操作温度0° C到50 ° C和运作中的湿度为20 ％至90 ％，非冷凝。

The author provides a solution based on added-on restraint zone to the problem of TA saturation. The distance protection is another important content. The thesis compares the relays based on operation equation with relays based on distance measuring. And then puts forward some viewpoints in changeable characteristics Mho relay, grounding fault distance relay, delta-Z relay and the power system swing and protection blocking.

距离保护是本项目的另一个重要内容，论文对常用的动作方程式与测距式距离继电器作了分析对比，对可变姆欧特性距离继电器、接地距离继电器、工频变化量距离继电器的性能、距离保护的振荡闭锁问题谈了一些看法，确定了装置距离保护的若干关键因素。

Breath, muscle contraction of the buttocks; arch body, as far as possible to hold his head, right leg straight towards the ceiling (peg-leg knee in order to avoid muscle tension).

呼气，收缩臀部肌肉；拱起身体，尽量抬起头来，右腿伸直朝向天花板（膝微屈，以避免肌肉紧张）。

The cost of moving grain food products was unchanged from May, but year over year are up 8%.

粮食产品的运输费用与5月份相比没有变化，但却比去年同期高8％。