摘要
设计了一种用于电力变压器空载及负载试验的容量损耗测试仪器。该仪器具有以下特点:仪器对三相电压电流同时采样;基于旋转式光电编码器和液晶显示屏的人机交互界面简洁而高效;可编程计数器阵列PCA"捕获"信号的过零点用于双向过零平均鉴相,得到准确的相位差和周期;基于实时参数自寻优的软件同步采样,有效地减小了周期截断误差,提高了测量准确度;数字化功率测量引入了传统的二表法和三表法,扩展了仪器的使用范围;实际容量根据负载损耗用软件查表的方法来判别;测量值已从试验温度折算到了参考温度(75℃)时的值。
A capacity and loss measuring instrument for no-load and load test of power transformer is developed. The instrument simultaneously sample for three phase voltage and current. Rotary photoelectric coding switch and LCD are used for human-computer interaction, it makes the interface compact and efficient. Utilizing the function of positive and negative edge trigger of the programmable counter array （PCA） unit in MPU, signal zero-cross is captured for the phase detected based on double way. The software synchronism sampling method based on real-time parameter self-optimizing minishes period truncation error, and the measurement accuracy is improved. The digitization power measure imports traditional two-unit and three-unit methods and expands application range of the instrument. The capacity is discriminated by software table-look-up on the load loss. The value of a quantity is converted to the value when reference temperature（75 ℃） from test temperature.
出处
《浙江科技学院学报》
CAS
2008年第3期170-174,共5页
Journal of Zhejiang University of Science and Technology
关键词
电力变压器
功率损耗测量
容量判别
智能同步采样
参考温度折算
power transformer
power loss measurment
capacity distinguishing
intelligence synchronous sampling
reference temperature converting
