How to detect DC system grounding fault?
For DC system grounding fault detection, the commonly used methods include resistance balance method, voltage measurement method, AC signal injection method and unbalanced bridge method . The resistance balance method can quickly judge the grounding condition of DC bus and select the grounding bus.
Can a voltage change be identified if a branch feeder is grounded?
The voltage measurement method uses the voltage change to judge the grounding fault, and can quickly judge whether the bus voltage changes. But, the bus voltage change caused by branch feeder grounding cannot be effectively identified, and the bus voltage change caused by operation in DC system cannot be identified whether it is grounded .
What is a DC ground fault detection system?
In many dc systems, the battery is floating with respect to earth ground. Ground fault detection systems provide a means for indicating or measuring current leakage paths between ground and the positive or negative terminal of a battery or battery charger. This application note describes common methods for dc ground fault detection.
What happens if a DC BUS is grounding a branch feeder?
However, when the grounding of branch feeder occurs, the voltage of DC bus will decrease, and it is unable to judge the grounding of branch feeder . The voltage measurement method uses the voltage change to judge the grounding fault, and can quickly judge whether the bus voltage changes.
How to calculate bus voltage UK of DC system?
The positive and negative bus voltage UK of DC system is calculated; Open K5 and close other switches. Measure DC voltage U'1 at both ends of R; K4 is disconnected, other switches are closed, and DC voltage U"1 at both ends of R2 is measured; The positive and negative bus voltage UK of DC system is calculated.
Can resistance balance determine the grounding condition of DC BUS?
The resistance balance method can quickly judge the grounding condition of DC bus and select the grounding bus. However, when the grounding of branch feeder occurs, the voltage of DC bus will decrease, and it is unable to judge the grounding of branch feeder .
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