变压器

The dielectrometry technique, which is not yet mature, can be used to detect moisture content in pressboard.

介电测量方法适合于变压器绝缘纸板中的微量水分诊断，但该技术尚未成熟。

ABSTRACT The task 《Principle of Dielectrometry Measurements of Moisture Content in Pressboard and Research on the Measurement System》 is ...

变压器绝缘纸板微水分介电测量原理及其测量系统的研究》课题为中国输变电行业技术攻关课题（编号Y98010211）。

Thus an oil-paper insulation system model is introduced for the return voltage analysis. By testing different aged paper or pressboard, the impact of aging degree to the return voltage may be achieved, and it could be helpful to the aging assessment. Based on the principle of polarization process, the basic theory of return voltage is present.

为此，在研究油浸电力变压器绝缘结构的基础上构建了油纸绝缘系统模型，针对该模型进行了回复电压试验，试图通过改变纸的老化程度来分析此时回复电压的变化规律，以期由此有助于进行老化评估。

ABSTRACT The task 《Principle of Dielectrometry Measurements of Moisture Content in Pressboard and Research on the Measurement System》 is a key problem to tackle in the electric power industry in China (S No.Y98010211), which is also a worldwide difficult problem.

变压器绝缘纸板微水分介电测量原理及其测量系统的研究》课题为中国输变电行业技术攻关课题（编号Y98010211）。它同时也是国际同行业的难题之一。

The presence of moisture in transformer pressboard has a detrimental effect on insulation life by lowering electrical breakdown strength and thermal endurance.

变压器绝缘纸板干燥过程微水分检测机理与试验研究》是中国输变电行业技术攻关课题(编号Y98010211)，是国际同行业难题之一。

For large capacity of inverter, due to the dc bus voltage is higher, ac output generally do not need to boost transformer can achieve 220V, in medium and small volume of inverter, due to the low voltage dc 12V, such as, must design, 24V pressor circuit.

对大容量的逆变器，由于直流母线电压较高，交流输出一般不需要变压器升压即能达到220V，在中、小容量的逆变器中，由于直流电压较低，如12V、24V，就必须设计升压电路。

According to accidents caused by disqualification of transformer pressure relief valve in power systems operation,a series of digital test systems were developed to suit for different pressure relief valves. Also the working principle and performance of this system were introduced.

针对电网实际运行中由于变压器压力释放阀的质量问题导致的事故，建立了一套适用于不同规格压力释放阀的数字式测试系统，介绍了其工作原理以及性能。

Transformer is to use the principle of electromagnetic induction to change the AC voltage of the device, the main component is the primary coil, secondary coil and core.

变压器是利用电磁感应的原理来改变交流电压的装置，主要构件是初级线圈、次级线圈和铁心。

Primary transformer coil, etc.

变压器一次侧，等。

The matrix equations for calculating primary and secondary phase voltage and phase current are deduced.

三相变压器的不对称现象通常是由外施电压的不对称或负载的不对称而引起的。

However, as the name（read－only memory）implies, CD disks cannot be written onorchanged in any way.

然而，正如其名字所指出的那样，CD盘不能写，也不能用任何方式改变其内容。

Galvanizes steel pallet is mainly export which suits standard packing of European Union, the North America. galvanizes steel pallet is suitable to heavy rack. Pallet surface can design plate type, corrugated and the gap form, satisfies the different requirements.

镀锌钢托盘多用于出口，替代木托盘，免薰蒸，符合欧盟、北美各国对出口货物包装材料的法令要求；喷涂钢托盘适用于重载上货架之用，托盘表面根据需要制作成平板状、波纹状及间隔形式，满足不同的使用要求。