BazTech - Yadda

Ograniczanie wyników

Znaleziono wyników: 2

Liczba wyników na stronie

Wyniki wyszukiwania

Wyszukiwano:
w słowach kluczowych: MV fuse

Sortuj według:

Ogranicz wyniki do:

Uncertainty of the characteristics of electrical devices based on the measurements of time-current characteristics of MV fuses

Daszczyński T., Pochanke Z., Kolimas Ł.

Bulletin of the Polish Academy of Sciences. Technical Sciences

2020

Vol. 68, nr 4

751--757

Functional properties of some electrical devices are expressed in the form of a dependence between parameters defining a given aspect of device duty or work circumstance (e.g. breakdown voltage): contacts distance for a circuit breaker, current (voltage for voltage limiters or reaction time), and load current for over current protection. Such characteristics are obtained experimentally, usually in a set of test series, each performed with a fixed independent parameter. Results of each series generate sets of data for estimation of statistical properties of a dependent parameter: distribution, expected value, variance and confidence interval. These statistics concern one point of the tested characteristic, so to get data of it as a whole, that would satisfy the needs for designing an electrical system, a large number of tests can be necessary. The way to reduce the number of tests may consists in: defining the characteristic not as a series of points, but as an analytical function with some specific parameters. This can be combined with aggregation of results of all tests in one set of data for estimation of statistical properties of the mantioned parameter. This paper presents an application of the above approach to tests of time-current characteristics of fuses.

Metody ograniczania prądów zwarciowych w sieciach SN : stan obecny i tendencje rozwojowe

Berczyński R., Kulas S. J., Supronowicz H.

Elektro Info

2018

nr 7-8

47--50

W pracy przedstawiono przykłady wykorzystania środków biernych i czynnych do ograniczania prądów zwarciowych w sieciach SN. Skuteczne ograniczenie wartości prądu zwarciowego oraz czasu jego trwania pozwala na poprawę jakości energii elektrycznej, a także na zmniejszenie przekrojów torów prądowych, stosowanie tańszych, o nieco niższych parametrach technicznych aparatów elektrycznych, jak również ograniczenie skutków zwarć łukowych w rozdzielnicach.

The paper presents examples of the use of passive and active means to limit short-circuit currents in MV grids. Effective limitation of short-circuit current and its duration, allows to improve the quality of electricity, as well as to reduce the cross-sections of current paths, use cheaper, with slightly lower technical parameters of electrical apparatus, as well as reduce the effects of arc faults in switchgears.