Guide to Key Electrical Equipment Selection for Photovoltaic Power Stations: How to Choose Distribution Boxes, Distribution Cabin, and Junction Boxes?
As the global installed capacity of photovoltaic power continues to climb, the selection of electrical equipment for photovoltaic stations has become a focal point of the industry. Among these, distribution boxes, distribution cabinets, and junction boxes, as core components of the power station, directly impact the efficiency and of the system. This article will delve into the key points of selecting distribution boxes, distribution cabinets, and junction boxes in photovoltaic power stations.1. for DC High Voltage Systems: Distribution Boxes and Distribution Cabinets Must Match High Voltage Grades
In large-scale photovoltaic power stations, the side voltage is commonly increased to 1500V, which poses higher requirements for the insulation performance of distribution boxes and distribution cabinets:Distribution Boxes: DC 100V/1500V dedicated design is required, and internal components must comply with UL 508A or IEC 62930 standards
: Need to be equipped with DC disconnectors and anti-reverse current protection devices to avoid current backflow that could damage components.Junction Boxes: Need to support high voltage series connection and have PID (potential-induced degradation) resistance function.2. Outdoor Weather Resistance: Distribution Boxes and Junction Boxes Be UV-Resistant and Corrosion-Resistant
Photovoltaic power stations are exposed to the outdoors for a long time, and distribution boxes, distribution cabinets and junction boxes must adapt to extreme environments:
Distribution Boxes: Box material is recommended to be galvanized steel plate (≥1.5mm) or engineering plastic (-resistant).Distribution Cabinets: Must pass the salt fog test (over 1000 hours), suitable for coastal high humidity areas.Junction Boxes: Should use flame-retardant materials (UL94 V0) and have a waterproof and breathable film design.
Industry Case: A European photovoltaic power station suffered an internal short circuit due to poor sealing of the distribution box resulting in losses exceeding one million euros, highlighting the importance of proper selection.3. Smart Monitoring Trend: Distribution cabinets and boxes need to support remote operation and maintenance
As photovoltaic power stations become more widespread, distribution cabinets and boxes are gradually integrating monitoring functions:Smart Distribution Box: Built-in current/voltage sensors, supporting G/WiFi data transmission.Centralized Distribution Cabinet: Can be paired with SCADA systems to monitor the operating status of the string in real-time.Smart junction Box: Some manufacturers have launched optimized products with string-level monitoring.
Market Forecast: By 2025, the global market size for smart distribution boxes and cabinets increase by 35%, becoming a new growth point for the industry.4. Pagsunod sa Kaligtasan: Kailangang sumunod ang mga distribution box at cabinet sa mga internasyonal na sertipikasyon Ang mga photoltaic power station ay kinabibilangan ng mataas na boltahe na direktang kasalukuyang, na ginagawang mahalaga ang mga sertipikasyon sa kaligtasan:Kahon ng Pamamahagi:Dapat pumasa sa IEC 61439-2 (karaniwang low-voltage switchgear).Gabinete ng Pamamahagi:Kinakailangan ang certification ng CE para sa pag-export sa Europe, UL 67/UL 508A para sa North America.Juncyion Box:Dapat matugunan ang IEC 62790 (safety standard para sa mga photovoltaic junction box). Pinakabagong Pag-unlad: Simula noong 224, ang mga bagong regulasyon ng EU ay nangangailangan ng mga cabinet at kahon ng pamamahagi upang magdagdag ng pagpapagana ng Arc Fault Circuit Interrupter (AFCI).Konklusyon: Paano pumili ng pinakamagandang distribution box, cabinet, at junction box para sa mga photovoltaic power station?1. Pagtutugma ng boltahe:Bigyan ng priyoridad ang mga kahon ng pamamahagi at cabinet na idinisenyo para sa mga sistemang 1500V.2. Antas ng proteksyon:Ang mga panlabas na kagamitan ay dapat umabot sa IP65/IP66, ang mga junction box ay dapat na alikabok at hindi tinatablan ng tubig.3. Matalinong pagpapatakbo at pagpapanatili:Isaalang-alang ang mga smart distribution box at cabinet na sumusuporta sa IoT monitoring.
Tawag sa industriya: Habang umuunlad ang teknolohiyang photovoltaic, ang mga tagagawa ng mga distribution box at junction box ay dapat pabilisin ang pagbabago upang matugunan ang mga pangangailangan ng mas mahusay at mas ligtas na mga istasyon ng kuryente.