电力变压器

Failure of a transformer will definitely harm the safety and stability of the power system and the electrified railway.

变压器是电力系统和电气化铁路牵引供电系统的重要设备，其安全可靠性对电力系统和铁路的安全运营影响重大。

In this condition, the parallel transformer can exhibit nearly zero impedance to harmonic current and very high primary self-impedance to fundamental current and thus lead harmonic current in power systems to flow into the transformer branch. With a step-down transformer, the power semiconductor switches of the active power filter are always worked in relatively low voltage, which ensure the security and reliability of the active filtering device.

实时检测并联变压器一次侧的谐波电流，根据谐波补偿条件，得到谐波补偿电流的指令信号，通过电力电子变流器跟踪产生谐波补偿电流注入到二次侧补偿绕组中，使得并联变压器对谐波电流呈现近似为零的低阻抗，对基波电流呈现很大的一次侧自阻抗，从而输导系统中的谐波电流流入并联变压器支路。

When the power system load in a small disturbance, the system itself to maintain the stability of the power transmission capacity, the use of automatic excitation regulator device may reduce the reactance of the generator, and then further to maintain the transformer high-voltage bus voltage constant, so compensation not only its own reactor, but also compensation for the step-up transformer reactance, thus greatly improving the power limits of generators, which greatly increased the static stability of power system.

当电力系统的负载发生微小的扰动时，系统本身保持稳定送电的能力，使用自动励磁调节装置，则可减小发电机的电抗，再进一步维持变压器高压母线的电压恒定，这样不仅完全补偿了自身的电抗，而且还补偿了升压变压器的电抗，这样就大大提高了发电机的极限功率，即大大地提高了电力系统的静态稳定。

During monopolar operation of HVDC systems with ground return, there is a large scale DC route between soil and AC power net and currents returned from earth may enter into neutrals of transformers, which cause DC bias of transformers and influence transformers running.

直流输电系统单极大地运行时，土壤和交流电力系统构成一个大范围的直流通路网络，从大地返回的电流流过变压器中性点将使变压器出现直流偏磁，影响变压器的正常运行。

The isolation for a giant super-high-voltage transformer is a paramountly important problem in the power system.

大型超高压变压器线圈表面电场的分析计算孙孝瑞，丁巧林摘要大型超高压变压器的绝缘问题是电力系统中的重大课题。

An improved wavelet packet algorithmis introduced. Inrushes under different conditions can be identified form different kinds of internal fault on power transformers using the WPA. Simulation results show that correct identification of the inrush can be made with half-cycle sampled data under all kinds of condition.

其中包括：提出利用小波变换对变压器励磁涌流和各种内部故障进行时域分析，构造了一种基于小波包变换的识别变压器励磁涌流的快速算法；设计了一种基于正交小波变换的电力系统振荡与故障的快速识别算法。

The product is also a special facility of electric power and industrial enterprises for treatment of various insulation oils including non-conformable transformer oil, mutual inductor oil and circuit breaker oil, as well as a best choice for vacuum oiling of power equipment and drying of moisture of power equipment.

该产品也是一个特别设施，电力和工业企业用于治疗各种绝缘油包括非符合变压器油，互感器油及断路器油，而且是一个最好的选择真空注油的电力设备和烘干水分电力设备。

The principle of single phase transformer differential protection is presented, which is applied in the case of connecting bushing current transformer with air gap at lower voltage side for cutting down the cost in electric engineering.

针对在电力工程中为节省投资而采用低压套管内有气隙电流互感器的情况，论述了单相变压器差动保护原理，介绍了三相变压器差动保护的 3种接线方法。

Companies rely on some of Xi'an University of Electronic Science and Technology professor, research institutes of technology support, long-term cooperation in research and development power automation, electrical testing, electrical testing equipment, including: Switching mechanical properties tester, vacuum tester, cable fault tester, cable test Management systems, cables altimeter instrument, relay calibrator, DC high-voltage generator, or flow, test transformers, DC Resistance Tester, loop resistance tester, and change than the group tester, MOA tester, Transformer test aircraft, dielectric loss tester, ground resistance tester, such as electric Zhaoou table.

公司依托西安电子科技大学部分教授，科研院所的科技支持，长期合作研发电力自动化、电力测试、电气试验仪器设备，包括：开关机械特性测试仪、真空度测试仪、电缆故障测试仪、电缆测试管理系统、电缆测高仪、继电保护校验仪、直流高压发生器、升流器、试验变压器、直流电阻测试仪、回路电阻测试仪、变比组别测试仪、氧化锌避雷器测试仪、变压器试油机、介质损耗测试仪、接地电阻测试仪、电动兆欧表等。

Transformer is one of major electric apparatuses in power system, It plays an important role in the transmission of power supply.

变压器是电力系统中重要的电气主设备之一，它在整个电力系统中起转换枢纽的作用，它的安全运行直接影响到整个电力系统的安全稳定运行。

On the other hand, the more important thing is because the urban housing is a kind of heterogeneity products.

另一方面，更重要的是由于城市住房是一种异质性产品。

Climate histogram is the fall that collects place measure calm value, cent serves as cross axle for a few equal interval, the area that the frequency that the value appears according to place is accumulated and becomes will be determined inside each interval, discharge the graph that rise with post, also be called histogram.

气候直方图是将所收集的降水量测定值，分为几个相等的区间作为横轴，并将各区间内所测定值依所出现的次数累积而成的面积，用柱子排起来的图形，也叫做柱状图。