time transformer

The method of the real time harmonic analysis of bivariate AC-AC frequency transformer is discussed plenty of experiments prove its feasibility.

研究探讨了双变量交交变频器实时谐波分析的方法，并结合大量的实验验证了其可行性。

Research of zero time constant measuring method for transformer winding resistor

变压器绕组电阻零时间常数测量方法的研究

Transformer's DC resistance measurement is one of the primary item before transformer leaving factory and precautionary test. The inherent time constant of transformer is quite long, so it is very important to study how to shorten the measuring time.

电力变压器直流电阻测量是变压器出厂及预防性试验的主要项目之一，但电力变压器固有的时间常数较大，研究缩短电力变压器直流电阻的测量时间具有重要意义。

In recent years, the level and capacity of power transformer improve continuously, with the increase in domestic demand for electricity and the grid size. However, at the same time transformer failure rate and repair time are also increasing.

近些年来，随着国内电力需求和电网规模的扩大，电力变压器等级和容量不断提高，变压器故障率和修复时间也随之不断增大。

By presenting a method of asynchronous serial communication between computer and PLC, this paper discusses the communication programming in VB environment. The real time supervision of power transformer cooling control system has been realized.

提出了用计算机异步串行通信实现与PLC连接通信的方法，讨论了在VB环境下的通信编程实例，实现了对电力系统主变压器风冷控制系统的实时监控。

On this basis, a new algorithm based on time differential method to prevent differential protection mal-operation of inner bridge connected transformer is put forward.

在此基础上提出了内桥接线方式下，基于时差法的防止变压器差动保护误动的新判据。

Discussion on Real Time Work Procedure Monitoring at Port Transformer Substation Using Microcomputer

港口变电站微机实时工况监测的探讨

Calculation of Allowable Overload Time of Dry-Type Transformer

干式变压器允许过载时间的计算

The comprehensive switching control is carried out by the control strategy of combining transformer load with transformer temperature and the change rate of temperature. The cyclic operation of cooling unit group is controlled by the principle of accumulated operating time balance.

装置以变压器的负荷、油面温度与温度变化率相结合的控制策略进行冷却器的综合投切控制，以冷却器组的累计运行时间基本均衡为原则进行冷却器组循环控制。

Temperature data in transformer core during heating up under no-load test are analysed, and mathematical model for temperature rise curves at some test points established, thermal time constant in its expression assumed as a linear function of time.

分析了变压器空载试验时铁心温升过程的温度数据，得出试验点温升曲线的数学模型，其表达式中热时间常数为时间的一次函数，而试验点的极限温升可直接求出。

On basis of LR circuit transition process analysis, the paper describes measuring method of zero time factor for transformer wire-wound resistor with specific exciting supply.

本文在分析LR电路过渡过程的基础上，讨论了以特定激励源实现变压器绕组电阻零时间常数测量的方法。

The design method of the high voltage and the fast response time pulse transformer used in the condition of low load impedance was introduced.

介绍了工作于低阻抗负载下的高压大电流快响应脉冲变压器的一种设计方法。

This paper analysis reason of bring gas of C2H2 on the purifying process of transformer oil time and time, then brings some methods to treatment.

针对变压器油净化处理过程中多次产生乙炔（C2H2），分析原因并提出相应的防范措施。

Power transformer is the hub of the power transmission network, at the same time power transformer status evaluation which protects the power system which must be safe and reliable operation is the premise and foundation.

电力变压器是电网传输电能的枢纽，而电力变压器状态评价是保障电力系统安全可靠运行的前提和基础。

With simple structure, low cost and agile system, this method is suite for the time transmission in single transformer area.

该方案具有结构简单、设计成本低、系统组织灵活等特点，特别适用于单变压器供电区域内标准时间传递和分配。

This paper proposes a scheme for temporary time locking by using FFT ( fast fourier transformer) in OFDM ( orthogonal frequency division multiplexing). The OFDM has a good BER in multipath.

提出了OFDM（正交频分复用）利用FFT（傅里叶变换）实时同步方式的方案，在多径环境下具有有良好的特性。

The method to calculate thermal time constant and allowable overload time of dry-type transformer is presented. The calculating example with Excel is given.

提出了干式变压器热时间常数和允许过载时间的计算方法，给出了运用Excel的计算实例。

The master station sends parameters of power control period, power setting, setting depreciation coefficient, alarm time and control turns to the data acquire terminal of special transformer and the terminal will set the corresponding parameters after receiving the order.

主站依次向专变采集终端下发功控时段、功率定值、定值浮动系数、告警时间、控制轮次等参数，终端收到这些命令后设置相应参数。

For multi-degree nonlinear mechanical model of single phase transformer windings, the time domain response and the relation between the response and various parameters are obtained by Runge-Kutta method.

对于典型的单柱式变压器线圈系统建立了非线性多自由度模型，进行了短路响应数值分析，得出了响应特征及其和变压器各参数之关系。