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Distribution networks in China and several other countries are predominantly neutral inefficiently grounding systems (NIGSs), and more than 80% of the faults in distribution networks are single-phase-to-ground (SPG) faults. Because of the weak fault current and imperfect monitoring equipment configurations, methods used to determine the faulty line sections with SPG faults in NIGSs are ineffective. The development and application of distribution-level phasor measurement units (PMUs) provide further comprehensive fault information for fault diagnosis in a distribution network. When an SPG fault occurs, the transient energy of the faulted line section tends to be higher than the sum of the transient energies of other line sections. In this regard, transient energy-based fault location algorithms appear to be a promising resolution. In this study, a field test plan was designed and implemented for a 10 kV distribution network. The test results demonstrate the effectiveness of the transient energy-based SPG location method in practical distribution networks.
Wei Xie; Xuewen Wang; Chen Fang; Hengxu Zhang; Fang Shi; Xiaodong Xing; Baicong Sun. Field experiment using transient energy method to locate a single-phase to ground fault. Global Energy Interconnection 2020, 3, 585 -594.
AMA StyleWei Xie, Xuewen Wang, Chen Fang, Hengxu Zhang, Fang Shi, Xiaodong Xing, Baicong Sun. Field experiment using transient energy method to locate a single-phase to ground fault. Global Energy Interconnection. 2020; 3 (6):585-594.
Chicago/Turabian StyleWei Xie; Xuewen Wang; Chen Fang; Hengxu Zhang; Fang Shi; Xiaodong Xing; Baicong Sun. 2020. "Field experiment using transient energy method to locate a single-phase to ground fault." Global Energy Interconnection 3, no. 6: 585-594.
With the advancement of active distribution network construction, to solve the shortcomings of the existing distribution network technology in distribution network perception and control, the relevant technologies of the Wide Area Measurement System (WAMS) in the transmission network have attracted more attention in terms of their usage in the distribution network. Micro Multifunction Phasor Measurement Unit (μMPMU), as an example, is being gradually utilized in the distribution network. However, the existing synchronous phasor transmission protocol is mainly designed for the transmission network, which requires an extension to meet the communication requirements to be directly used in the distribution network. In this work, the requirements of active distribution network communication are analyzed, and trade-offs between National Standard of the People’s Republic of China/Recommended (GB/T) 26865.2-2011 and International Electro technical Commission (IEC) 60870-5-101/104 protocol are compared. An extension method of the communication protocol is proposed, with the benefits of the prioritized transmission of important data, expanded remote control function of μMPMU, increased types of offline files, and reduced amount of network communication and data storage. The method is built upon the existing GB/T 26865.2-2011 protocol, and refers to the Application Service Data Unit (ASDU) of IEC 60870-5-101/104 to add an application extension frame. Application extension frames are used to transmit telemetry data, telesignalization, partial commands, and partial offline files. Finally, an experimental environment is set up, which includes a phasor measurement unit (PMU) Emulator, distribution network phasor data concentrator (PDC), and main station emulator to implement the standard GB/T 26865.2-2011 protocol and extension protocol. The feasibility and effectiveness of the method are confirmed by the superior performance of the extended protocol compared with the standard protocol.
Weiqing Tao; Mengyu Ma; Ming Ding; Wei Xie; Chen Fang. A Priority-Based Synchronous Phasor Transmission Protocol Extension Method for the Active Distribution Network. Applied Sciences 2019, 9, 2135 .
AMA StyleWeiqing Tao, Mengyu Ma, Ming Ding, Wei Xie, Chen Fang. A Priority-Based Synchronous Phasor Transmission Protocol Extension Method for the Active Distribution Network. Applied Sciences. 2019; 9 (10):2135.
Chicago/Turabian StyleWeiqing Tao; Mengyu Ma; Ming Ding; Wei Xie; Chen Fang. 2019. "A Priority-Based Synchronous Phasor Transmission Protocol Extension Method for the Active Distribution Network." Applied Sciences 9, no. 10: 2135.