1、 I 摘要 作为电网中重要的设备之一，电力变压器的正常工作与否直接影响电网的安全稳 定运行。本论文首先阐述了电力变压器在线监测系统的研究目的和意义、国内外研究 动态和发展趋势，然后进行了深入地分析。 本文其次介绍了铁心接地电流、电压、温度在线监测系统。该系统能够实现对变 压器铁心接地电流、电压、温度的实时或定时监测和历史数据的存储，并在接地线电 流、电压、温度超过国家标准后能够发出信号和实现限流电阻的自动投切，将接地电 流、电压、温度限制在规程要求的范围之内。变压器铁心电流、电压、温度的在线监 测，必须确保采集到的信号真实可靠，同时应保证监测装置最小限度的改变变压器的 运行接线状态。作为一种工
2、作在电流大范围内变化的设备，必须具备较好的量程自动 转换及保护电路。在变压器所处的恶劣的电磁环境中，设备要能够稳定可靠的工作， 抗电磁干扰是难点。作为便携式设备，应保证信号所测得的数据能够方便的上传给控 制人员，通讯方式最好采用无线方式。尽可能实现多点接地故障的自动处理。 关键字：电力变压器；铁芯接地电流；电压；变压器油温；在线监测 II Abstract As one of the important equipment in the power grid, power transformer works or not directly affect the safe and stable
3、operation of power grids. This paper first provides power transformer online monitoring system of purpose and meaning, research and development trends at home and abroad, and then make a thorough analysis. This second article describes core earth currents, voltages, temperature online monitoring sys
4、tem. The system can be realized on earth current, voltage and temperature of transformer core storage or regularly monitored in real time and historical data, And on the ground, current, voltage, temperature exceeds the national standards will be able to send a signal and automatic switching of curr
5、ent - limiting resistor, to limit the earth current, voltage and temperature within the scope of the code requirements. Current, voltage and temperature on - line monitoring of transformer core, you must ensure that collected signals are true and correct, should ensure that monitoring devices at the
6、 same time minimise change the running of transformer connection state. As a change in the current scope of work equipment must have a good Automatic Range conversion and protection circuit. In adverse electromagnetic environment of the transformers, stable and reliable equipment to be able to work, EMI is difficult. As a portable device, make sure the signal measured it easy to upload data to the control of personnel, means of communication the best use of wireless means.Automatic processing fo
