Naslov
Transient recovery voltage investigation on HV circuit breaker in hydro power plant

Autori
Filipović-Grčić, Božidar ; Stipetić, Nina ; Vuković, Franjo ; Jerković, Ante ; Šanić, Mišo ; Musulin, Katarina

Izvornik
Electric power systems research (0378-7796) 220 (2023); 1-9

Vrsta, podvrsta i kategorija rada
Radovi u časopisima, članak, znanstveni

Ključne riječi
Generator circuit-breaker ; High-voltage circuit breaker ; Out-of-phase switching ; Transient recovery voltage

Sažetak
Transient Recovery Voltage (TRV) analysis is a type of electromagnetic study that proves if the circuit breaker (CB) can withstand switching transients. Switching transients’ incidence and severeness is determined by surrounding electrical system, hence special locations of CB installation require more attention. This paper shows TRV calculations on a CB that is placed at HV terminals of a step-up transformer in a hydro power plant. Since there is no classical generator CB placed on the MV terminals of the step-up transformer, the breaker placed on the HV terminals is used for synchronizations to the grid. The requirements for HV CB placed in such locations are given in IEC 62271–100, where it is stated that proximity of a generator is regarded as a special case. For TRV analysis, the CB and surrounding network were modeled in EMT-like software. TRVs are calculated for terminal faults, short-line faults, capacitive current and out-of-phase switching. Power-frequency voltage stress and arc influence on the short-circuit DC component are discussed. Due to the exceeded TRV envelopes and lack of their definition for out-of- phase switching, a CB of a higher voltage level is recommended for installation in the case study considered in this paper.

Izvorni jezik
Engleski

Znanstvena područja
Elektrotehnika

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