The 33rd China International Exhibition on Electric Power Equipment and Technology
Shanghai International Energy Storage Technology Application Expo / Hydrogen Energy Expo
Distribution automation (DA) refers to the deployment of automated monitoring, switching, and control systems on medium-voltage (typically 6–35 kV) distribution networks to improve reliability, efficiency, and operational visibility. Core DA technologies include: automated reclosers and sectionalising switches that isolate faults and restore supply to healthy network sections without manual intervention; fault indicators that detect and report fault location to the distribution management system (DMS); remote terminal units (RTUs) that collect real-time data from distribution substations and field devices; distribution SCADA systems that provide operators with real-time network visibility and remote control; volt/VAr optimisation (VVO) systems that automatically adjust voltage and reactive power across the distribution network; and advanced distribution management systems (ADMS) that integrate SCADA, DMS, and outage management functions. China's distribution automation programme — driven by State Grid and Southern Grid investment — has achieved high penetration of DA equipment in urban networks, with ongoing expansion into rural areas.
5 Key Questions About Distribution Automation
Distribution automation reduces outage duration through automated fault isolation and supply restoration (FISR). When a fault occurs on a distribution feeder, automated reclosers attempt to clear temporary faults (e.g., tree contact) by opening and reclosing. If the fault is permanent, automated sectionalising switches isolate the faulted section and restore supply to healthy sections by switching to alternative supply paths — all within seconds, without requiring a field crew to manually locate and isolate the fault. This can reduce the average outage duration (SAIDI) by 50–80% compared to manual fault management, and significantly reduce the number of customers affected by each fault.
Volt/VAr optimisation (VVO) uses automated control of voltage regulators, capacitor banks, and transformer tap changers across the distribution network to maintain voltage within acceptable limits while minimising reactive power flows and distribution losses. VVO algorithms continuously monitor voltage and reactive power at multiple points in the network and issue control commands to maintain voltage in the optimal range — typically the lower end of the acceptable band — which reduces energy consumption by voltage-sensitive loads (primarily motors and lighting). Studies show that VVO can reduce distribution network energy losses by 2–5% and peak demand by 1–3%.
Distribution automation is essential for managing the bidirectional power flows created by distributed solar, storage, and EV charging on distribution networks. Advanced distribution management systems (ADMS) with real-time network models can calculate the hosting capacity of feeders for additional distributed resources, identify voltage and thermal constraint violations, and automatically reconfigure the network to accommodate high penetrations of distributed generation. Automated voltage control systems manage the voltage rise caused by rooftop solar export, and automated protection systems handle the fault current contribution from distributed generators.
Distribution automation requires reliable, low-latency communication between field devices and the distribution control centre. Communication options include: fibre optic (highest reliability and bandwidth, used for primary substations and major switching points); power line communication (PLC) using HPLC or narrowband PLC for last-mile connectivity to distribution transformers and smart meters; 4G/5G cellular for remote and rural devices where fibre is not economical; and dedicated wireless networks (WiMAX, TETRA) for utility-owned communication infrastructure. The communication architecture must provide sufficient reliability and latency for protection and control functions (typically <100 ms) while also supporting high-volume data collection from smart meters and sensors.
China has one of the world's most advanced distribution automation programmes, driven by State Grid and Southern Grid investment in urban network modernisation. State Grid's 14th Five-Year Plan targets distribution automation coverage of over 90% of urban distribution networks, with ongoing expansion into rural areas. Chinese DA equipment manufacturers — including NR Electric, NARI Technology, and Xuji Group — have developed competitive products that dominate the domestic market and are increasingly exported internationally. The integration of distribution automation with smart meters, distributed energy resources, and electric vehicle charging infrastructure is the next phase of China's distribution network modernisation programme.
Key Takeaways
Distribution automation is the operational intelligence of the medium-voltage distribution network, enabling automated fault management, voltage optimisation, and real-time network visibility. China's world-leading distribution automation programme creates sustained demand for reclosers, RTUs, ADMS software, and communication equipment. EP Shanghai is the premier platform for distribution automation technology providers to connect with China's utility buyers and international grid operators.
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