Покращення захисних властивостей протиаварійної автоматики суднових систем електропостачання

Abstract

Обґрунтовано актуальність підвищення чутливості апаратів релейного захисту до струмів віддалених коротких замикань при реалізації віддаленого резервування відмов захистів. Доведено можливість ідентифікації виду різкого зростання струму в перехідному режимі виникнення збурення електричного кола.

The urgency of the increase of the sensitivity of the relay protection devices to the remote short-circuit currents under the implementation of the remote backup of the protection failure of the ship power supply systems has been proved. The aim of the study is the improvement of the protective properties of the ship overcurrent protection systems through the increase of the sensitivity of the relay protection devices to the short-circuit currents using the complex criteria of the emergency modes identification to provide the selectivity and the remote backup. It is shown how the digital processing of the current sensors signals allows enhancing the abilities of the used protection in the automatic circuit breaker trip elements. The possibility of the identification of the current inrush type in the transient mode of the initiation of the electrical circuit disturbance is proved. The scientific and technical argument for the application of the complex criterion of the identification of the starting current of the asynchronous motor is given. The algorithm of the operation of the microprocessor protection device under the blocking of the automatic circuit breakers operation is suggested. It will provide the guaranteed start-up and the acceleration of the asynchronous motor. The study results can be used in the design of the new overcurrent protection systems of the ship power supply systems and the modernization of the current ones. The improvement of the protective properties of the emergency automatics is achieved by the means of the remote backup of the failures of the relay protection devices. The new protective property of the microprocessor circuit breaker trip allows performing the remote backup of the protection failures and improving significantly the fire safety of the ship power supply systems.