Partner: J. Wańkowicz


Recent publications
1.Papliński P., Wańkowicz J., Ranachowski P., Ranachowski Z., Doświadczenia z eksploatacji wysokonapięciowych liczników zadziałań oraz badania degradacji mikrostruktury pochodzących z nich warystorów ZnO, PRZEGLĄD ELEKTROTECHNICZNY, ISSN: 0033-2097, DOI: 10.15199/48.2018.10.01, Vol.94, No.10, pp.1-7, 2018
Abstract:

W pracy przedstawione zostały doświadczenia z eksploatacji liczników zadziałań, które stanowiły inspirację do badań pochodzących z nich warystorów ZnO. Badana była mikrostruktura elementów pochodzących z uszkodzonych liczników zadziałań. Odniesienie stanowił analogiczny warystor, z licznika który nie był w eksploatacji. Badania wykazały nietypowy skład fazowy tworzywa badanych warystorów oraz niską jednorodność i spoistość ich czerepu. Opisano i udokumentowano procesy degradacji tworzywa o zróżnicowanym nasileniu. Wykazano szkodliwy wpływ wilgoci we wnętrzu rozszczelnionego licznika zadziałań na jego funkcjonowanie, w tym na umieszczone w nim warystory ZnO. Przedstawiono ponadto wnioski dotyczące kontroli eksploatacyjnej liczników zadziałań.

Keywords:

licznik zadziałań, warystory ZnO, mikrostruktura ceramiki ZnO, degradacja materiału ceramicznego

Affiliations:
Papliński P.-other affiliation
Wańkowicz J.-other affiliation
Ranachowski P.-IPPT PAN
Ranachowski Z.-IPPT PAN
2.Papliński P., Wańkowicz J., Ranachowski P., Ranachowski Z., Microstructure and degree of degradation of ZnO varistors in surge arresters due to operation , ARCHIVES OF METALLURGY AND MATERIALS, ISSN: 1733-3490, DOI: 10.24425/123800, Vol.63, No.3, pp.1267-1273, 2018
Abstract:

The paper presents the test results for the microstructure of ZnO varistors comprising high voltage gapless surge arresters. The tests were performed on varistors produced in different periods and by various manufacturers. The research was inspired by different characteristics of changes in values of current flowing through surge arresters as a function of changes in values of system voltage in a 220 kV substation, and the temperature in a multi-year cycle. Furthermore, the effects of varistor microstructure degradation following a failure of an unsealed surge arrester were investigated. The results provided the grounds for assessment of ZnO varistor microstructure parameters in terms of their durability and resistance to degradation processes. Keywords: surge arrester, MO varistor, microstructure of ceramics, ceramic material degradation

Affiliations:
Papliński P.-other affiliation
Wańkowicz J.-other affiliation
Ranachowski P.-IPPT PAN
Ranachowski Z.-IPPT PAN
3.Mackiewicz M., Mikulski J.L., Wańkowicz J., Kucharski S., Ranachowski P., Ranachowski Z., Study of composite insulator sheds subjected to wheel test, ARCHIVES OF METALLURGY AND MATERIALS, ISSN: 1733-3490, DOI: 10.1515/amm-2017-0101, Vol.62, No.2, pp.679-686, 2017
Abstract:

The paper presents investigation of the properties of the surface and the material stiffness – flexibility of series of samples taken from the sheds of the composite insulators. The insulators were previously subjected to wheel test. The wheel test and 1000 h salt fog test are regarded as alternative examination of the material resistance to the effects of electrical surface discharges. There were investigated two series of the samples of the composite insulators sheds. Examined specimens, made of HTV silicone rubber, were taken from the sheds of medium-voltage composite insulators of two different manufacturers. Insulators of both types passed the 1000 h salt fog test without reservation. Meanwhile, the wheel test can provide a basis for better distinguishing between physical properties of the tested materials. In the case of the insulators of one of the manufacturers the wheel test result was negative. Cross puncture effect of the sheds took place in several places. In addition, sheds were covered with dark coating of varying thicknesses. The results of the study indicated a significantly stronger influence of electrical and temperature factors on the sheds under investigations during the wheel test than in the case of the 1000 h salt fog test. It can be stated that these tests cannot be considered as alternative and it seems that wheel test enables better distinguishing between properties of the materials.

Keywords:

composite insulators, silicone rubber, wheel test, electrical surface discharges, tracking and erosion

Affiliations:
Mackiewicz M.-other affiliation
Mikulski J.L.-other affiliation
Wańkowicz J.-other affiliation
Kucharski S.-IPPT PAN
Ranachowski P.-IPPT PAN
Ranachowski Z.-IPPT PAN