Photovoltaic grid-connected high-voltage complete set of equipment

A high-voltage PV grid-connected complete set integrates switchgear, protection, metering, and control systems to safely connect large-scale solar power plants to the grid.OverviewHigh-voltage PV grid-connected equipment is used at the grid connection points of large-scale or distributed photovoltaic systems, typically handling voltages from 10kV to 36kV. Its primary role is to manage power transfer between the PV plant's step-up transformer and the public grid while ensuring safety, reliability, and compliance with grid codes such as IEEE 1547 and IEC 61727 .Core ComponentsHigh-Voltage SwitchgearIncludes circuit breakers, contactors, disconnectors, and earthing switches.Provides rapid fault clearance, isolation, and personnel safety through internal arc fault containment (IAC AFLR 25 kA / 1s), .Modular designs allow integration with third-party relays (e.g., SEL, ABB REF) and expansion of metering/protection compartments .Protection and Control SystemsOver/Under Frequency Protection (ANSI 81H/81L) and anti-islanding protection (ANSI 81R) ensure grid stability.Real-time monitoring of voltage, current, power, and harmonics (THD ≤ 3%) supports operational safety and power quality management .Remote dispatch control and SCADA integration via IEC 61850 GOOSE/SV or Modbus TCP enable centralized plant management .Metering and Instrument TransformersCurrent transformers (CTs) and voltage transformers (VTs) provide accurate measurement for energy accounting and grid compliance .Surge ProtectionSurge arresters protect against lightning strikes and switching overvoltages, often installed at service entrances and sub-distribution boards .DC Combiner Boxes and InvertersCombine multiple PV strings for centralized management.Facilitate fault detection, maintenance, and performance monitoring of individual strings .Inverters convert DC from PV arrays to AC for grid injection, sometimes including battery charging capabilities .Standards and SafetyCompliance with IEC 62271-102 for isolation and earthing.Modular and expandable design ensures flexibility for different voltage levels (10kV, 11kV, 12kV, 15kV, 33kV, 36kV) and plant sizes .Internal arc fault containment and visible isolation gaps enhance operator safety during maintenance .ApplicationsLarge-scale PV power plants and distributed solar installations.Integration with utility grids requiring high-voltage interconnection.Systems requiring real-time monitoring, remote control, and high reliability for continuous operation .SummaryA high-voltage PV grid-connected complete set is a comprehensive solution combining switchgear, protection, metering, surge protection, and control systems. It ensures safe, reliable, and efficient integration of solar power into the grid while supporting modular expansion, monitoring, and compliance with international standards. This equipment is essential for modern PV plants operating at medium to high voltage levels.