Abstract
Fault current due to asynchronous connection of the generator to the grid and impact on HV circuit breaker with gas SF6
Highlights
During certain faults in the power system there are cases where fault currents delay passing through zero
This paper presents analysis of the performance of circuit breaker in disconnection of the failure currents that appear as a result of asynchronous connection of the generator on the grid
The system source was modeled with short-circuit current and the highest rms value of the symmetrical component of the polyphase short-circuit
Summary
During certain faults in the power system there are cases where fault currents delay passing through zero. This occurs when the value of DC current component of the fault current is high and with the long time delay. The high values of DC component of current occur in cases of generator connection to the grid without fulfilling synchronization conditions. The connection of the generator to the grid without meeting synchronization conditions happens very rarely. Connection without synchronizing condition is accidental and among other things can be a result of failure on control circuits which enable connection of the generator to the grid. Various analyses regarding the phenomenon of appearance of DC component and problems that appear during tripping of the circuit breaker are dealt with in the chapters bellow
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