智能变电站合并单元采样报文极性配置校验方法

Checking Method for Polarity Configuration of Merging Unit Sample Value Message in Smart Substation

在常规变电站中,一次系统模拟量经过互感器变换为二次回路模拟量后,经保护装置的交流插件引入相应的模拟量采集回路,互感器和交流插件的极性均应进行校验以保证装置采样正确。智能变电站中由合并单元采集二次回路模拟量并发送采样值报文至保护装置,发送的采样值报文极性配置可更改。因此,在进行常规互感器极性校验的基础上,还应对合并单元的发送报文极性进行校验。对此提出1种校验合并单元发送报文极性的简便方法,通过在交流插件外部施加1直流电压激励,借助报文分析工具抓取并解析其发送的采样值报文,根据分析得到的采样值波形特征确定其极性配置是否满足要求。试验仿真及现场应用均验证了该方法的可行性。

In conventional substation,the primary system analog accesses analog acquisition circuit through AC plug-in in protection devices after transforming into secondary analog.The polarity of the transformer and AC plug-in should be checked to ensure that the device is correctly sampled.In intelligent substation,the merging unit collects the analog of the secondary loop and sends the sample value message to protection devices.The polarity configuration of the sample value message can be changed,thus on the basis of the regular transformer polarity checking,the polarity of the sample value message should also be verified.This article describes a simple method to check the polarity of the message:by applying a DC voltage stimulus outside the AC plug-in,capture and parse the sampled value message by the message analysis tool,analyze the waveform characteristics to determine if the polarity configuration meets the requirements.The feasibility of the method is verified by experimental simulation and field application.