


Scope of Application:High-Voltage PV Grid-Connection Switchgear is used at the grid connection points of large-scale or distributed PV systems. It acts as the central unit between the step-up transformer’s high-voltage output (typically 10kV–36kV) and the public grid, managing power transfer, providing protection, enabling real-time monitoring, and ensuring grid code compliance.
Rated Voltage (Ur): 10KV,11KV,12kV,17.5kV,24kV,33KV,36kV (Internationally prevalent levels);
Power Frequency Withstand Voltage (1 min): 28 kV (12kV system), 38 kV (24kV system), 70 kV (36kV system);
Lightning Impulse Withstand Voltage (BIL): 95 kV (12kV), 125 kV (24kV), 170 kV (36kV);
Rated Current (Ir): 630 A to 4000 A (Selected based on PV array capacity);
Rated Short-Time Withstand Current (Icw): 25 kA to 50 kA for 1s to 4s;
Ingress Protection (IP) Rating: IP4X (Enclosure) / IP2X (Internal compartments);
Enclosure Material: Aluminium-Zinc coated steel (Corrosion-resistant);
Ambient Temperature Range: -25°C to +55°C (Indoor) / -40°C to +70°C (Outdoor Type)
1. Product Overview
The High-Voltage PV Grid-Connection Switchgear is the core high-voltage grid-interconnection equipment for PV power plants. It integrates modules such as circuit breakers/contactors, protection relays, metering CTs/VTs, and surge arresters. Its core mission, within the framework of IEEE 1547/IEC 61727 standards, is to ensure safe interaction between the PV system and the grid. It provides functions including rapid fault clearance, power quality monitoring (e.g., voltage flicker mitigation), anti-islanding protection (ANSI 81R), and supports remote dispatch control.
Primary Functions
Grid-Connection Control: Integration of load switch/circuit breaker for safe grid connection and disconnection.
2.Protection Functions:
Instantaneous Overcurrent Protection;
Directional Overcurrent / Earth Fault Protection;
Reverse Power Protection (Anti-backfeeding);
Over/Under Voltage Protection (ANSI 27/59);
Over/Under Frequency Protection (ANSI 81H/81L).
Measurement & Monitoring: Real-time acquisition of voltage, current, power, harmonics (THD ≤ 3%).
Isolation & Earthing: Visible isolation gap + Earthing switch (Compliant with IEC 62271-102).
Communication Interface: Supports IEC 61850 GOOSE/SV, Modbus TCP for integration with plant SCADA system.
3.Product Characteristics
Integrated Intelligence: Incorporates Intelligent Electronic Devices (IEDs), supporting GOOSE communication and remote O&M.
Modular Design: Expandable metering/protection compartments, compatible with third-party relays (e.g., SEL, ABB REF).
Enhanced Safety:
Fully enclosed, metal-clad construction (Compliant with IEC 62271-200);
Internal Arc Fault Containment Level (IAC AFLR): 25 kA / 1s (Ensures personnel safety).
Environmental Resilience:
Anti-corrosion coating (C5-M salt spray resistance);
Dust and moisture protection (IP54 optional).
Compact Layout: Optimized cubicle space, reducing footprint by 30% (compared to traditional designs).
Standards Compliance: Fully compliant with IEEE 1547a-2020 grid codes and international utility interconnection requirements.
Primary Functions
Grid-Connection Control: Integration of load switch/circuit breaker for safe grid connection and disconnection.
Protection Functions:
Instantaneous Overcurrent Protection;
Directional Overcurrent / Earth Fault Protection;
Reverse Power Protection (Anti-backfeeding);
Over/Under Voltage Protection (ANSI 27/59);
Over/Under Frequency Protection (ANSI 81H/81L).
Measurement & Monitoring: Real-time acquisition of voltage, current, power, harmonics (THD ≤ 3%).
Isolation & Earthing: Visible isolation gap + Earthing switch (Compliant with IEC 62271-102).
Communication Interface: Supports IEC 61850 GOOSE/SV, Modbus TCP for integration with plant SCADA system.
Switchgear Model Designation & Dimensions
Typical Models: KGN-12 (Fixed type), ZS1-24 (Withdrawable type), UniGear 36 (International brand generic series);
Standard Dimensions:
Height: 2200 mm to 2400 mm;
Width: 600 mm to 1000 mm (Single cubicle);
Depth: 1500 mm to 1800 mm (Including operating aisle).
Note: Dimensions vary based on voltage level and configuration (e.g., metering/protection compartment).