高压电器2025，Vol.61Issue(2)：93-101,9.DOI:10.13296/j.1001-1609.hva.2025.02.011
智能温度传感器取能CT计算一次电流算法研究
Research on Primary Current Calculation Algorithm Based on Power CT of Intelligent Temperature Sensor
刘开禹 1杨光 1郑仁鹏1
作者信息
- 1. 厦门ABB电力设备有限公司,福建 厦门 361006
- 折叠
摘要
Abstract
Temperature sensor of circuit breaker,as an element to real-time monitor temperature of key area of elec-trical equipment,is an important part of intelligent circuit breaker.Since the temperature measured by the tempera-ture sensor is related to the magnitude of primary current,power CT is used in this paper for measurement of primary current in order to ensure the accuracy of real-time monitoring.However,both operating temperature and magnetic saturation effect of coil have significant influence of the secondary current.As the temperature has significant influ-ence on the secondary current,the secondary current waveform is firstly collected(with 10 kHz sampling frequency)under different temperatures and different primary currents.The morphological filtering method is used for denoising raw signals,the peak of fitted sinusoidal waveform is obtained by way of extracting signal fragment to perform sinusoi-dal function fitting based on trust-region reflection non-linear least squares method.The normal temperature data-peak-current relationship curve collected in the temperature chamber is taken as the calibration curve.Primary cur-rent can be calculated by matching the fitted waveform's peak and calibration curve.The maximum deviation be-tween the calculated value and real current value is 3.86%under such environment,which,to the maximum extent possible,correct the influence of the temperature and magnetic saturation to the secondary current.关键词
一次电流计算/数学形态学/信赖域/非线性最小二乘法/取能CTKey words
primary current calculation/mathematical morphological/trust region/nonlinear least squares method/power CT引用本文复制引用
刘开禹,杨光,郑仁鹏..智能温度传感器取能CT计算一次电流算法研究[J].高压电器,2025,61(2):93-101,9.
