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在牵引供电系统中由于避雷器长时间受到工频电压、冲击电压和环境因素的影响而老化,或者由于装配工艺的不良,致使密封缺陷而引起的受潮,而老化或者受潮会使避雷器的绝缘性能受到破坏,导致避雷器失效而引发热崩溃,乃至发生爆炸,因而监测避雷器的运行状态显得尤为重要。而阻性电流中的基波分量Ir1能够反应出避雷器的运行状况,为此设计了基于DSP的避雷器的在线监测系统,此系统采用外部24位ADC芯片ADS1256采集信号,可以提高数据的准确度。在本系统中所有的电路均采用工业级电路,系统设计合理,稳定性好,抗干扰能力强,成本低、简单智能,对保障牵引供电系统的稳定性起着重要的意义。
In the traction power supply system due to the arrester for a long time by the power frequency voltage, impact voltage and environmental factors aging, or due to poor assembly process, resulting in sealing defects caused by moisture, and aging or damp will arrester insulation will be affected Damage, leading to failure of the arrester caused thermal collapse, or even an explosion, it is particularly important to monitor the operating status of the arrester. However, the fundamental component of resistive current, Ir1, can reflect the operating status of the arrester. Therefore, an on-line monitoring system based on DSP is designed. The system uses an external ADS1256 24-bit ADC chip to collect signals, which can improve the accuracy of the data. All the circuits in this system adopt industrial circuits. The system has reasonable design, good stability, strong anti-interference ability, low cost and simple intelligence, which plays an important role in ensuring the stability of traction power supply system.