Surge load experiment design and results analysis of relay
Due to the transient overvoltage or overcurrent when relay's contacts switch different loads, the relay's contacts are damaged by transient arc erosion of electrical-over-stress, which influences the reliability of relay seriously. Firstly, according to the life test requirements of one type of electromagnetic relay with permanent magnets, the load circuit and the testing program are designed, which has characteristic of adjustable surge current time. Secondly, the contacts' breaking arc and closing bounce under 2A resistive load, 5A resistive load and surge load are analyzed. The influence of surge load on relay's electrical life is studied with increasing of test cycles. Finally, based on the testing data, the optimal design of relay has been modified and the results have been analyzed, which is helpful for improving the life of the relay.
Polarized Relay Contacts Gap Measurement Based on Machine Vision Technology
Assembly consistency of relay contact system is one of the key factors which affects the consistency of the polarized relays of the same batch. Gap length of relay contacts is an important parameter to evaluate the consistency of the relay contact system. In this article, focusing on the measurement of miniature polarized relay contact gap, an automated vision measurement method of miniature relay contact gap based on the improved machine vision technology is proposed. Contact gap measurement process consists of image grabbing, image preprocessing, image edge detection, improved Huber algorithm image edge fitting, contact gap automatic calculation and the comparison between measurement data and design requirements. The proposed method is a hybrid algorithm, consisting of two stages: the training stage and the measurement stage. This method has important implications for the relay contact system installation and adjustment, further, helps assess batch consistency of the relay products.
Representation of systems disturbed by wide band noise
In this paper, a method of handling and working with wide band noise is developed. We represent wide band noise as a distributed delay of white noise and use it to reduce a nonlinear system disturbed by wide band noise to a nonlinear system disturbed by white noise. An application of this reduction to a nonlinear filtering problem under a wide band noise disturbance is discussed.