A distribution panel comprising: an inner partition partitioning a front power transformer (PT) chamber and a rear cable chamber , wherein the inner partition comprises: a vertical partition wall , on which a bushing is disposed in a penetrating manner, the vertical partition wall further having openings allowing an arc to pass there through; and inner covers rotatably coupled to the vertical partition wall to open and close the openings , and rotated by an arc pressure when an arc accident occurs in the front power transformer PT chamber, to open the openings , characterized in that the openings include an upper opening formed in a position higher than the bushing and a lower opening formed in a position lower than the bushing , the inner covers include an upper cover opening and closing the upper opening and a lower cover opening and closing the lower opening , the upper cover has a horizontal hinge shaft provided in an upper portion of the vertical partition wall and is rotated centered on an upper portion thereof, and the lower cover has a horizontal hinge shaft provided in a lower portion of the vertical partition wall and is rotated centered on a lower portion thereof. an inner partition partitioning a front power transformer (PT) chamber and a rear cable chamber , wherein the inner partition comprises: a vertical partition wall , on which a bushing is disposed in a penetrating manner, the vertical partition wall further having openings allowing an arc to pass there through; and inner covers rotatably coupled to the vertical partition wall to open and close the openings , and rotated by an arc pressure when an arc accident occurs in the front power transformer PT chamber, to open the openings , characterized in that the openings include an upper opening formed in a position higher than the bushing and a lower opening formed in a position lower than the bushing , the inner covers include an upper cover opening and closing the upper opening and a lower cover opening and closing the lower opening , the upper cover has a horizontal hinge shaft provided in an upper portion of the vertical partition wall and is rotated centered on an upper portion thereof, and the lower cover has a horizontal hinge shaft provided in a lower portion of the vertical partition wall and is rotated centered on a lower portion thereof. a vertical partition wall , on which a bushing is disposed in a penetrating manner, the vertical partition wall further having openings allowing an arc to pass there through; and inner covers rotatably coupled to the vertical partition wall to open and close the openings , and rotated by an arc pressure when an arc accident occurs in the front power transformer PT chamber, to open the openings , characterized in that the openings include an upper opening formed in a position higher than the bushing and a lower opening formed in a position lower than the bushing , the inner covers include an upper cover opening and closing the upper opening and a lower cover opening and closing the lower opening , the upper cover has a horizontal hinge shaft provided in an upper portion of the vertical partition wall and is rotated centered on an upper portion thereof, and the lower cover has a horizontal hinge shaft provided in a lower portion of the vertical partition wall and is rotated centered on a lower portion thereof. <EOS>