JB/T 51080-1999

Manufacturers of tractors, internal combustion engines, agricultural vehicles, and construction machinery use this standard to test and grade the quality of alternators. Quality inspection agencies and certification bodies rely on this standard to classify generators into qualified, first-class, and premium grades. By specifying clear durability, performance, and environmental adaptability criteria, this standard ensures generator reliability and interchangeability under various operating conditions.

拖拉机、内燃机、农用运输车和工程机械的制造商使用本标准来检测和评定交流发电机的质量等级。质检机构和认证部门依据本标准对发电机进行合格品、一等品和优等品的分级。本标准通过明确的耐久性、性能和环境适应性指标，确保发电机在不同工况下的可靠性和互换性。

This standard specifies product quality grading requirements for alternating current generators used in tractors and internal combustion engines, covering three grades: qualified, first-class, and premium. It includes indicators for durability, working performance, regulator function, overspeed, vibration, shock, voltage withstand, temperature change, high temperature, damp heat, splash-proof, interchangeability, appearance, and assembly quality. Durability tests include normal and accelerated (high-temperature high-speed, variable speed and load) methods, with different test durations and conditions for each grade. The standard also provides detailed test methods and inspection rules, applicable to quality testing and grade evaluation of generators for tractors, internal combustion engines, agricultural vehicles, and construction machinery.

本标准规定了拖拉机、内燃机用交流发电机的产品质量分等要求，包括合格品、一等品和优等品三个等级。标准涵盖耐久性、工作性能、调节器功能、超速、振动、冲击、耐电压、温度变化、高温、湿热、防溅、互换性、外观及装配质量等多项指标。耐久性试验包括常态和强化（高温高速、变速变载）两种方法，不同等级对应不同的试验时间和条件。标准还规定了详细的试验方法和检验规则，适用于拖拉机、内燃机、农用运输车和工程机械用发电机的质量检测与等级评定。