GB/T 34933-2017 in English
VALIDTechnical code for combiner box test of photovoltaic power station
- Issued on:2017-11-01
- Implemented on:2018-05-01
- File Format:PDF
- Delivery:Via email within 1~3 business days
$243.00
《GB/T 34933-2017光伏发电站汇流箱检测技术规程》由524（中国电力企业联合会）归口，主管部门为中国电力企业联合会。
Introduction
Interpretation of GB/T 34933—2017 Technical Specification for Inspection of Combiner Boxes in Photovoltaic Power Stations
| Standard dimensions | Technical requirements | Test methods | Compliance assessment |
|---|---|---|---|
| Basic environmental conditions | Temperature range: $15^\circ C \sim 35^\circ C$, humidity range: $45\% \sim 75\%$, air pressure range: $86~kPa \sim 106~kPa$ | The environmental test chamber simulates different climatic conditions and uses temperature and humidity sensors for monitoring. | Comply with GB/T2423 series environmental test standards |
| Testing equipment | Ground continuity tester, arc generator, data acquisition device, etc. | Calibrate the accuracy of the equipment to ensure that the measurement error is within the allowable range. | The equipment complies with the requirements of GB/T28030 and GB/T20840 series standards |
Explanation of professional terms and practical application cases
Photovoltaic string (PV string): In a photovoltaic power generation system, several photovoltaic modules are connected in series to form a circuit unit with a certain DC output. For example, in a rooftop photovoltaic power generation system, 6-10 photovoltaic modules are usually connected in series to form a string.
Electrical clearance and creepage distance: This is a key indicator to measure the insulation performance of electrical equipment. For example, in the design of the combiner box, the minimum electrical clearance of the equipment with a rated voltage of $1000~V$ should be no less than 18mm, and the creepage distance should be no less than 31mm.
Background of Standard Formulation and Analysis of Technology Evolution
GB/T 34933-2017 was formulated against the background of the rapid development of China's photovoltaic power generation industry. With the advancement of photovoltaic technology and the expansion of system scale, higher requirements are put forward for the safety and reliability of combiner boxes. This standard combines advanced domestic and foreign detection methods to fill the gap in this field in China.
Implementation Suggestions
- Training and Standardization Management: Conduct systematic training for technical personnel to ensure that they are familiar with the standard content and detection process. Establish a complete equipment ledger management system.
- Testing Equipment Configuration: Equipped with test instruments that meet the accuracy requirements, calibrated and maintained regularly.
- Risk prevention and control: In high altitude areas, special attention should be paid to the correction of electrical clearance and insulation performance to avoid safety hazards caused by environmental factors.
- Continuous optimization: Pay attention to industry technology trends and update testing standards and methods in a timely manner.
For more details, please refer to the test report template and arc generator structure requirements in the appendix.
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