变压器

Reactive compensation device, a new kind of dynamic device which can separately measure the voltage and current signals using PCC as master controller and can sample the signals using programmable amplifier, may pretreat the reference voltage in order to adjust expediently.

0引言在电网中安装并联电容器等无功补偿装置，可就地补偿感性负载所消耗的无功功率，从而减少电网电源向感性负荷所输送的无功功率，降低线路和变压器因输送无功功率造成的电能损耗。

Considering the characteristics of distribution transformers, a system based on GPRS networks is put forward by taking a practical managing system of distribution transformer as an example. It utilizes the direct connection between GPRS network and Internet, setting a server in Internet, which takes charge of the transfer of the communication of the master station and the terminal units.

针对配变监测系统对数据传输可靠性和实时性的要求，本文通过介绍一种基于移动GPRS无线通信的配电变压器监测系统，提出基于GPRS网络的配变自动化通信解决方案。

This reduces the impact of a short circuit and assures that the bus does not conduct current through the aircraft. A Manchester code is used to present both clock and data on the same wire pair and to eliminate any DC component in the signal (which cannot pass the transformers). The bit rate is 1.0 megabit per second (1 bit = 1 μs).

该结构可以削弱短路对总线的影响并保证总线不会传导在航空器中流转的电流。1553总线用曼彻斯特码表示导线对上的时钟信号和数据信号，这可以去除信号中的直流成分，因为直流成分不能通过变压器。1553总线的波特率是1兆位每秒，即每微秒传输一位信号。

The project includes replacing five high-voltage regulating rectifier transformers with larger units rated at 86 megavolt amperes, to increase capacity and allow Dubal to combine two smelting potlines.

该工程包括将五个高压整流变压器替换为额定功率86兆伏安的整流器，以提高容量以及使Dubal合并现有的两个冶炼电解池。

Using a megohmmeter, make insulation tests on motor and transformer windings from phase to phase and phase to ground.

使用欧姆表检测电机和变压器绕组的各相间及各相的对地绝缘性能 e。

Disturbing Voltage is estimated equivalently according to the measurement of the typical numerical values between the leakage voltage and leakage resistance from the equipment of the oscillograph and the millivoltmeter based on the working frequency disturbance model.

在工频干扰模型基础上，通过对示波器和毫伏表的电源变压器漏电阻和等效漏电压典型值的测量，估算了工频干扰电压的幅度，从而说明电子测量系统各设备间共地连接的必要性，并介绍了共地方式在交流电桥等实践中的应用实例。

Based on the finite element method,the minium energy principle and the voltage equilibrium principle have been developed to calculate the ampere-turn distribution of parallel coils in a shell-type transformers.

本文基于有限元技术，提出计算壳式铁心变压器并联线圈中电流分配的最小能量法和电压平衡法，并证明了两种方法的等价性。

A mathematical cascade model of 35 kV power transmission line with concentrated parameter is developed and a multiple modules coupling model of this power transmission system fit for digital real-time simulation is further presented on the basis of known model of synchronous machine and composite load.

建立了35kV输电线正常运行状态级联集中参数数字仿真的数学模型，并在已知同步发电机、变压器和综合负载模型的基础上，进一步提出了适合于35kV馈电系统数字实时仿真的多模块耦合模型，同时给出了相应的数字积分方法。

In the process of realizing the remote control of electromotor meter, it probes into the realization of the GPRS wireless collector emphatically which is on the kernel ground. It adopts the means of area-centralizing control to manage the electromotor meters affiliated by it. It communicates with the central control station by GPRS Modem and transmits the commands and data to the instrument by wireless, which makes the collection and transmission of the field data come true. In the process of realizing the remote control of voltage transformer meter, according to the actual requirement, it adopted the chips and modules that are different from the front means to design and realize the GPRS wireless communicating controller corresponding with the devices. It also introduces the mixed—mode Communication integrating the GSM with GPRS to settle the problem that too many GPRS terminals connecting with the central control station synchronously will affect the performance of the central control station.As a whole system, the central control station is the kernel of the digital oil field.

在油田电机表远程控制方案实现中，着重介绍了处于核心地位的GPRS无线集中器的实现，它采用区域集中控制的方式管理下属的石油电机表，与主控站采用GPRS Modem进行通信，与仪表则采用无线电方式进行命令和数掘的传输，实现了现场数据采集传输；在配电变压器表远程控制方案实现中，根据应用需要，采用与前一个方案完全不同的硬件芯片和模块，设计实现了与仪表设备——对应的GPRS无线通信控制器，并针对同时挂接在主控站上的GPRS终端太多会对主控站性能产生一定的影响这个问题，引入了GSM和GPRS相结合的混合通信模式。

Then based on the least squares support vector machine method, the modificatory model of the main environmental factors effect on the tanδ was advanced, and the genetic algorithm method was used to optimize the parameters of this model.

根据人工气候室内变压器套管tand的在线测量试验结果，分析了环境因素对电容型设备tand的影响情况，提出了基于最小二乘支持向量机的主要环境因素对tand影响的修正模型，并采用遗传算法优化了支持向量机的参数。

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％。