基于GPRS的配电网故障定位系统的通信改进方法

在基于通用分组无线业务（general packet radio service，GPRS）的配电网故障定位系统中，若数据传输单元（data transfer unit，DTU）长时间不传输数据，易出现“掉线”现象。DTU可通过主动向数据中心发送“心跳包”来增强在线能力，但有些DTU并不具备主动发送“心跳包”的功能。为此，提出在数据中心侧采用间断通信法，即由数据中心不断地询问DTU，从而解决掉线问题，该方法是“心跳包”法的逆向方法。通过编程，间断通信法被集成为数据中心侧故障分析软件（fault analysis software，FAS）的一项功能，使FAS具有增强DTU在线能力的功能。实验测得的数据及其分析结果，表明了该方法的有效性。

Communication Implementation of GPRS Based Fault Location System in Power Distribution Networks

In a GRPS-based fault location system (GRPS: general packet radio service), if a DTU (data transfer unit), which has already built the communication with its data centre, doesn’t send data to the data centre for a long time, the built communication will emerge off-line phenomenon. Generally, the heart-beat packet method is used to reduce the frequency of off-line phenomenon and enhance its ability of on-line communication. But, some types of DTUs don’t have the heart-beat packet function. To solve the problem, an intermittent communication method was proposed,which is reverse to the method based on “heart-beat” package and works by asking the DTUs to keep in touch from the data center, thus making the off-line problem solved. Moreover, the intermittent communication method was integrated into the fault analysis software(FAS) of the data center through programming, which make the FAS has the ability to enhance on-line communication ability of DTU. Finally, the experiment data and analysis verified the effectiveness of the proposed method.