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![Dependence of the contact surface on contact erosion [1].](profile/Piotr-Borkowski-3/publication/266265907/figure/fig4/AS:392127910563843@1470501987154/Dependence-of-the-contact-surface-on-contact-erosion-1.png)
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![Fig. 5. Quantity analysis of the recorded waveforms [14].](profile/Piotr-Borkowski-3/publication/266265907/figure/fig2/AS:392127910563840@1470501987041/Quantity-analysis-of-the-recorded-waveforms-14_Q320.jpg)
![Fig. 10. Dependence of the contact surface on contact erosion [1].](profile/Piotr-Borkowski-3/publication/266265907/figure/fig4/AS:392127910563843@1470501987154/Dependence-of-the-contact-surface-on-contact-erosion-1_Q320.jpg)
This paper presents methodology of research and presentation of the selected measurements' results of electrical power contacts aging on multiple high current switching which were carried out by the authors. The research was carried out for composite materials used in low voltage circuit breakers. The research covered arc erosion, change of contact...
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Citations
... By registering indirect quantities, T a and E a can be calculated using various optical diagnostics e.g., pyrometer and spectrograph [19], or utilizing a fast camera [20] and voltage-current diagrams for simultaneous registration of arc energy determination [21,22]. ...
The paper presents a procedure for measuring and analyzing the switching arc parameters occurring in air-insulated low voltage (LV) relays operating in distorted supply voltage conditions. The main purpose of the research was the analysis of the switching arc duration and its energy affecting the current breaking capacity of the selected LV current interrupters (CI). The performed study and simple statistical analysis enabled the determination of the main factors and their impact level on parameters of the switching arc that comes about during switching-off operation. Experimental tests executed for various shapes of the supply voltage but similar RMS (Root Mean Square) and THD (Total Harmonic Distortion) values and for various breaking moments of the load current allowed recognition of the decisive factors for estimating the tested relay's switching-off capacity. Tests stand combined with dedicated software developed in the frame of the research, permiting fast calculation of the arc parameters based on a large number of recorded diagrams.
... Undoubtedly, this has a significant influence on the contact wear mechanism. Resistance, the amount of heat generated for the switch throughput when a contact or a contact pair is closed, as well as arc erosion resistance when they are being opened are all dependent on the phase composition and structure of composite contacts [8][9][10][11]. Direct contact-point surfaces are the most exposed to the high thermal energy of the electric arc. Therefore, refractory wolfram or wolfram carbide are used as phases increasing the material's resistance to the effect of the pulse, high temperatures. ...
This paper presents technological trials aimed at producing Ag-W, Ag-WC, Ag-W-C and Ag-WC-C composite contact materials and characterizing their properties. These materials were obtained using two methods, i.e. press-sinter-repress (PSR) at the refractory phase content of less than 30% by weight as well as press-sinter-infiltration (PSI) at the refractory phase content of ≥50% by weight). The results of research into both the physical and electrical properties of the outcome composites were shown. They include the analysis of the influence of the refractory phase content (W or WC) on arc erosion and contact resistance changes for the following current range: 6 kAmax in the case of composites with a low refractory phase content, 10 kAmax in the case of composites with the refractory phase content of ≥50% by weight.
