Connection structure between main transformer and high-voltage device box and railcar including same
A connection structure includes: a circuit breaker connected to a power cable through which high-voltage power is supplied; a high-voltage device box accommodating the circuit breaker; a main transformer configured to transform a voltage of the high-voltage power and provided under the floor of the car; a first connector device electrically connected to the circuit breaker and provided at a dividing wall of the high-voltage device box; a second connector device electrically connected to the main transformer and provided at a dividing wall of the main transformer; and a high-voltage cable covered with an insulating coating and having both end portions to which cable connector portions are respectively attached, wherein the high-voltage cable connects the first connector device and the second connector device in such a manner that the cable connector portions respectively fit and are connected to the first connector device and the second connector device.
1. A connection structure between a main transformer and a high-voltage device box, the connection structure comprising:
a circuit breaker connected to a power cable through which high-voltage power is supplied, the high-voltage power being collected through an overhead contact line by a power collector provided on a roof of a car;
the high-voltage device box accommodating the circuit breaker and being provided under a floor of the car;
the main transformer being configured to transform a voltage of the high-voltage power and being provided under the floor of the car;
a first connector device electrically connected to the circuit breaker and provided at a dividing wall of the high-voltage device box, the first connector device including
a first base portion electrically connected to the circuit breaker,
a first joint connector portion projecting from the first base portion, and
a first conductor embedded in the first base portion and the first joint connector portion and including a tip end exposed from the first joint connector portion;
a second connector device electrically connected to the main transformer and provided at a dividing wall of the main transformer, the second connector device including
a second base portion electrically connected to the main transformer,
a second joint connector portion projecting from the second base portion, and
a second conductor embedded in the second base portion and the second joint connector portion and including a tip end exposed from the second joint connector portion; and
a high-voltage cable covered with an insulating coating and having both end portions to which cable connector portions are respectively attached, wherein
the high-voltage cable connects the first connector device and the second connector device in such a manner that the cable connector portions respectively fit and are connected to the first connector device and the second connector device, wherein
each of the cable connector portions includes a housing portion,
each of the housing portions includes
a fit tubular portion including a fit opening whose fit direction is a direction substantially perpendicular to a longitudinal direction of the high-voltage cable, and
a base tubular portion which is continuous with the fit tubular portion so as to be substantially perpendicular to the fit tubular portion and into which a tip end portion of the high-voltage cable is inserted; and
in a state where the fit tubular portions respectively fit the first joint connector portion and the second joint connector portion, the first conductor and the second conductor are respectively connected to connecting terminals respectively provided at both end portions of the high-voltage cable.
2. The connection structure according to claim 1 , wherein:
each of the cable connector portions includes a work tubular portion provided so as to extend substantially perpendicular to its base tubular portion and project in an opposite direction from which its fit tubular portion extends on a substantially same straight line as its fit tubular portion;
each work tubular portion is provided with a work opening communicating with a connection portion between one of the first and second conductors and one of the connecting terminals; and
an insulating plug is attached to each work opening.
3. The connection structure according to claim 1 , further comprising:
a lower surface member configured to cover the high-voltage device box, the main transformer, and at least a part of the high-voltage cable from below; and
a fixing member configured to fix the lower surface member to a car floor structural member or a car underfloor device, wherein
at least one of the lower surface member and the fixing member includes a locking device configured to be in a locked state when the power collector is in a state capable of collecting power through the overhead contact line.
4. A railcar comprising the connection structure according to claim 1 .
5. The connection structure according to claim 2 , further comprising:
a lower surface member configured to cover the high-voltage device box, the main transformer, and at least a part of the high-voltage cable from below; and
a fixing member configured to fix the lower surface member to a car floor structural member or a car underfloor device, wherein
at least one of the lower surface member and the fixing member includes a locking device configured to be in a locked state when the power collector is in a state capable of collecting power through the overhead contact line.
6. A railcar comprising the connection structure according to claim 2 .
7. A railcar comprising the connection structure according to claim 3 .
8. A railcar comprising the connection structure according to claim 5 .