Based on Heat Accumulation Over-load Protection Mathematical Model
The over-load protection technology is an indispensable constituent of the low voltage apparatus intellectualization and is widely used in the products, such as low-voltage circuit-breaker, overload relay and so on. Moreover, this technology is very important to ensure the electric motor and the distribution line safe operation. This paper establishes a mathematical model for the dynamic over-load protection, based on the heat balance differential equation, to determine how temperature increases with the change of the protection objects current. Different from the common inverse time characteristic, this model conforms to the load actual operating law and the protection request. And to solve the problem of the full-wave Fourier algorithm which is disable to filter decaying DC component and has worse frequency characteristic, it is presented an algorithm depending on the combination of subtraction filter and full-wave Morlet complex wavelet amplitude algorithm to get out the amplitude value of fundamental component of the current in the distribution line.
over-load protection Morlet wavelet heat accumulation equivalent current subtraction filter
Chi Changchun Wu Yi Chen Jianwei
Tianjin Institute of Urban Construction, Tianjin 300384 Hebei University of Technology, Tianjin 300130
国际会议
温州
英文
451-454
2009-10-18（万方平台首次上网日期，不代表论文的发表时间）