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根据全并联AT供电方式的特点,提出了保护动作流程,并给出了具体的保护方案。根据保护动作流程,变电所馈线重合闸动作前后的供电方式改变,必然导致保护装置整定值的改变,针对该变化,提出了对同一断路器随着重合闸动作改变整定值的保护方案,从而保证保护的可靠性,然后给出了它们之间的配合原理,保证保护装置不误动和不拒动。最后在本文保护方案的基础上,提出了一种简单可行的测距方法。
According to the characteristics of full-parallel AT power supply, a protection action flow is proposed and a specific protection scheme is given. According to the protection action flow, the change of the power supply mode before and after the reclosing of the feeder in the substation will inevitably lead to the change of the setting value of the protection device. In view of this change, a protection scheme for changing the setting value of the same breaker with the reclosing action is proposed To ensure the reliability of the protection, and then gives the principle of cooperation between them to ensure that the protection device is not mistaken and does not move. Finally, based on the protection scheme of this paper, a simple and feasible distance measurement method is proposed.