GB/T 7251.2-2023 in English
VALIDLow-voltage switchgear and controlgear assemblies―Part 2:Power switchgear and controlgear assemblies
- Issued on:2023-08-06
- Implemented on:2024-03-01
- File Format:PDF
- Delivery:Via email within 5 business days
$650.00
《GB/T 7251.2-2023低压成套开关设备和控制设备 第2部分：成套电力开关和控制设备》由TC266（全国低压成套开关设备和控制设备标准化技术委员会）归口，主管部门为中国电器工业协会。
Introduction
Interpretation of the core content of the standard
GB/T 7251.2-2023, as the second part of the low-voltage complete switchgear and control equipment series standard, focuses on the specific requirements of complete power switchgear and control equipment (PSC-complete equipment). This standard applies to indoor and outdoor fixed/mobile equipment with a rated voltage of ≤1000V AC or ≤1500V DC, and for the first time includes special specifications for photovoltaic application complete equipment (PVA).
Key technical requirements
| Project | New content | Revision points |
|---|---|---|
| Structural requirements | Definition of active cooling system (3.4.101) | Internal isolation type increased to 7 categories (8.101) |
| Performance verification | Calculation verification of natural cooling equipment above 1600A (10.10.4.101) | Extension of protection level of withdrawable components (8.2.101) |
| Photovoltaic equipment | Appendix DD defines special requirements for PVA | New solar radiation test method (DD.10.10.2.3.101) |
Typical application case
When a photovoltaic power station uses PVA complete set of equipment, special attention should be paid to the following:
- The DC side overvoltage category must be ≥ Class II (DD.9.1.3.1)
- The fuse must be gPV type (DD.8.5.3)
- Outdoor installation must pass the 1kW/m² solar radiation test (Figure DD.101)
Standard Evolution Analysis
Main changes compared to the 2013 version:
- Added a new photovoltaic equipment appendix (DD/EE/FF)
- Improved the classification requirements for internal isolation forms
- Introduced a temperature rise verification method for active cooling systems
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