GGD photovoltaic grid-connected cabinet
I. Core Positioning of GGD Photovoltaic Grid-connected Cabinets
Essential definition
Infrastructure: On the standard GGD low-voltage distribution cabinet framework, integrate dedicated modules for photovoltaic grid connection (such as anti-reverse flow protection and intelligent metering).
Core mission: To achieve the conversion of photovoltaic direct current to alternating current and safe grid connection, while coordinating the energy interaction between the power grid and the photovoltaic system.
Core function
The function of the functional module
Grid connection protection unit anti-islanding protection, overvoltage and undervoltage/frequency protection, reverse power monitoring (to avoid reverse power transmission to the grid)
The intelligent metering unit features bidirectional energy metering (power generation/power consumption) and remote data transmission (supporting RS485/4G).
Dc component suppression suppresses the DC component generated by the inverter to prevent magnetic saturation of power grid equipment
🔧 2. Customized design for photovoltaic scenarios
Electrical structure upgrade
Dedicated bus duct: Add an independent photovoltaic feeder channel, physically isolated from the conventional load bus to reduce interference.
Circuit breaker selection
Connection point circuit breaker: Equipped with photovoltaic dedicated circuit breakers (such as Schneider iPV or ABB Tmax PV), breaking capacity ≥50kA.
Enhanced safety protection
Lightning protection design
Dc side: Class I lightning arrester dedicated to photovoltaic (Up ≤1.5kV)
Ac side: Class II composite lightning protection module (In≥40kA)
Arc monitoring (optional) : AFCI arc fault protection to prevent fires on the DC side.
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