Distribute the monitoring terminal in the three-phase conductor of the overhead transmission line is our Dingsin Intelligent Technology transmission line distributed fault diagnosis system monitoring terminal distribution characteristics, and each phase of the conductor each installation of a monitoring terminal, this layout contains a number of important significance for ensuring the safe and stable operation of power lines, the key role in ensuring the safety and stability of operation. This layout contains many important meanings and plays a key role in ensuring the safe and stable operation of transmission lines.

1、Three-phase independent monitoring ;.

The A, B and C phase conductors are mutually independent electrical circuits in the transmission process, and the monitoring terminals installed on each phase of the conductor are capable of independently collecting and analyzing the operating parameters of the line in this phase. When a fault occurs, the fault characteristics of different phases may differ depending on the type of fault (e.g., lightning strike/non-lightning strike, high-resistance/metal ground fault, phase-to-phase short-circuit fault, etc.). By using the monitoring end of each of the three phase conductors, it is possible to ground determine in which phase the fault occurs, thus enabling more fault localization. For example, in a single-phase grounding fault, only the monitoring terminal of the faulty phase will detect typical fault characteristics such as a sudden change in the zero sequence current, and O&M personnel can quickly locate the faulty phase based on this information.

2、Space positioning advantages

Multiple observation points - By installing monitoring ends on all three-phase conductors, fault information can be obtained from different spatial locations, and for some faults that may be caused by differences in spatial location (such as inter-phase short-circuits caused by foreign objects, which may be contacted at different locations on different phase conductors), the data of the three-phase monitoring ends can be synthesized to more accurately Determine the spatial location of the fault point, but also the technical parameters of the transmission line distributed fault diagnostic system of the interval localization reliability of more than 99% of the underlying source.

3. Capturing the difference between different phase faults

Different types of faults in the three-phase conductor will show different electrical characteristics, through the comprehensive analysis of the three-phase monitoring end data, can identify a variety of complex fault types, is an important source of data for fault judgment.

4. Redundant monitoring safeguards

The installation of separate monitoring terminals on each of the three phases of the conductor is equivalent to providing redundant monitoring means. Even if a phase of the monitoring end of the communication failure, sensor damage and other failures, the other two phases of the monitoring end can still work normally, continue to provide part of the data for fault diagnosis, reduce the risk of failure due to a single monitoring end of the failure of the entire fault monitoring system failure.  

5. Data cross-validation ;

Under normal operating conditions, the electrical parameters such as current, voltage and phase of the three phases will satisfy a certain balance relationship. By comparing and analyzing the three-phase data, the accuracy of the data can be verified. When the data is abnormal, through the cross-validation of the three-phase data, it can distinguish whether the data change is caused by the real fault or the error or interference of the monitoring terminal itself, which becomes an important basis for the diagnosis process.