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Nano-indentation manipulator operated in SEM was constructed in order to investigate the electrical contacts on a nanometer scale. Then it is simultaneously possible to observe and control indentation movement and to measure the load force and electrical resistance. Particularly in order to investigate the influence of thick oxide layer on the electrical resistance during indentation, a tin substrate...
Systems in applications ranging from aerospace, automotive, to power distribution are all crucially comprised of electrical connectors. Every system with removable electrical components will have electrical connectors, and likewise these systems will be susceptible to the contact losses and failure modes of these connections. Corrosion is one of the largest causes of failure for electrical connectors...
The electromagnetic relays have lots of structures and are applied widely in the automation control system in aerospace. Firstly, the structures of aerospace electromagnetic relays (AEMR) were classified. According to the structure arrangement, there are three layers, two layers and one layer structures; from electromagnetic system, there are clapper type, balance armature type, polarized magnetic...
To establish a relationship between the physical structure of electrical contact boundary and constriction resistance in actual consumer connectors, we fabricated samples that represented the contact-simulated structure. The sample was created on silicon substrates via nanofabrication, and we measured the sample's electric resistance precisely. In these samples, the physical structure can be designed...
For automotive field, the vehicle vibrations induce movements of connector systems, composed of a female part system (springs) which is connected and tighten up with the male part system (pin). There is relative movement of the contact zone between spring and pin which can lead to the fretting corrosion phenomena. Several studies have been performed to investigate vibration consequences on electrical...
How to improve the electrical energy utilization of traditional mechanical and electrical equipment is a problem that deserves to be discussed, especially now when energy usage and sustainability is becoming more and more important. From the view point of energy, the closing process of AC contactor is an energy exchange process with the input electric energy changing into kinetic energy, thermal energy...
Reducing the electrical contact resistance (ECR) and the coefficient of friction (CoF) are major technological requirements for sliding contacts. This report provides electrical-tribological characteristics of a Copper containing Diamond-like Carbon (Cu-DLC) nanocomposite coating deposited on a brass plate, investigated by using a ball/plate reciprocating tribometer. The counterpart was a brass ball...
Fretting corrosion phenomenon is known as the main cause of contact resistance increasing in signal contact. But for power connectors this undesirable phenomenon in embedded systems is more complex because high current induces high voltages and subsequent Joule overheating can be expected during vibration. Our study deals with contact similar power connectors, ones submitted to vibration amplitudes...
Low voltage switchgear compartments are widely used in power distribution networks, and the temperature-rise is strictly limited by IEC 60439-1. Considering the contact resistance, eddy current and thermal flow, an electromagnetic-thermal-fluid coupled model is developed to predict the temperature-rise of a low voltage switchgear compartment. The circuit breaker in the compartment is simplified into...
This article describes arc faults detection methods based on the temporal analysis of electric lines current signatures. We first give the, specifications of the domestical loads under test. Then, we describe the methods under test: crest factor, average value, variance, adaptive filter and mathematics moments. In the second part, these methods are implemented on MATLAB — Simulink. The analysis is...
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