A distribution panel comprising: an inner partition partitioning a front power transformer 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 (52, 53) allowing an arc to pass there through; and inner covers (60, 62) rotatably coupled to the vertical partition wall to open and close the openings (52, 53), and rotated by an arc pressure when an arc accident occurs in the front power transformer PT chamber, to open the openings (52, 53), characterized in that the openings (52, 53) 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 (60, 62) 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 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 (52, 53) allowing an arc to pass there through; and inner covers (60, 62) rotatably coupled to the vertical partition wall to open and close the openings (52, 53), and rotated by an arc pressure when an arc accident occurs in the front power transformer PT chamber, to open the openings (52, 53), characterized in that the openings (52, 53) 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 (60, 62) 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 (52, 53) allowing an arc to pass there through; and inner covers (60, 62) rotatably coupled to the vertical partition wall to open and close the openings (52, 53), and rotated by an arc pressure when an arc accident occurs in the front power transformer PT chamber, to open the openings (52, 53), characterized in that the openings (52, 53) 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 (60, 62) 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.