US 4,731,723 AGranted

Power supply installation for DC electric railroad

AssigneeMeidensha Corporation

InventorsTeiji Nogi, Toyomi Gondo, Tuneo Tamura, Hiroyasu Sato

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Abstract

The power supply installation for a direct current railroad comprises two diode bridge-connected circuits, only two thyristor breakers each connected in parallel to each of the two diode bridge-connected circuits, four dc disconnecting switches each connected between a diode bridge-connected circuit and one of four electric car power supply lines constituting a double track, separately. Further, the two diode bridge-connected circuits are connected by a dc disconnecting switch closed only in case of an accident. In case a ground fault occurs at a power supply line, a powering current to the defective line is interrupted by one of the breakers, together with an extension power supply current supplied from an adjacent substation, without exerting an influence of accident upon the other power supply lines. Further, even if one of the breakers is broken, powering currents are kept supplied to all the power supply lines through a mutual spare bus bar.

Claims4

Dependent claims

An apparatus for use in an electric car power supply system including at least one AC power source, AC-DC converters connected to the AC power source for converting an AC power to a DC power and applying the DC power to a bus bar, the apparatus being connected between the bus bar and at least one pair of DC power supply lines for supplying the DC power to an electric car, the power supply lines being arranged in series and disconnected electrically with a dead section, comprising:

(a) a diode bridge having first, second, third and fourth diodes each having an anode and a cathode, the anode of the first diode being connected at a first junction to the cathode of the second diode, the anode of the third diode being connected at a second junction to the cathode of the fourth diode, the cathode of the first diode being connected at a third junction to the cathode of the third diode, the anode of the second diode being connected at a fourth junction to the anode of the fourth diode, the third junction being connected to the bus bar;
(b) a thyristor having an anode connected to the third junction and a cathode connected to the fourth junction, the thyristor breaking the connection between the third and fourth junctions in response to occurrence of an accident in at least one of the DC power supply lines;
(c) a first switch connected between the first junction and one of the power supply lines;
and
(d) a second switch connected between the second junction and the other power supply line.

2 more elements

An apparatus for use in an electric car power supply system including AC power sources, AC-DC converters connected to the AC power sources for converting an AC power to a DC power and applying the DC power to a bus bar, the apparatus being connected between the bus bar and first and second pairs of power supply lines for supplying the DC power to an electric car, the power supply lines of each of the first and second pairs being arranged in series and disconnected electrically with a dead section, comprising:

(a) a first diode bridge having first, second, third and fourth diodes each having an anode and a cathode, the anode of the first diode being connected at a first junction to the cathode of the second diode, the anode of the third diode being connected at a second junction to the cathode of the fourth diode, the cathode of the first diode being connected at a third junction to the cathode of the third diode, the anode of the second diode being connected at a fourth junction to the anode of the fourth diode, the third junction being connected to the bus bar;
(b) a first thyristor having an anode connected to the first junction and a cathode connected to the fourth junction, the first thyristor breaking the connection between the third and fourth junctions in response to occurrence of an accident in at least one of the power supply lines of the first pair;
(c) a first switch connected between the first junction and one of the power supply lines of the first pair;
(d) a second switch connected between the second junction and the other power supply line of the first pair;
(e) a second diode bridge having fifth, sixth, seventh and eighth diodes each having an anode and a cathode, the anode of the fifth diode being connected at a fifth junction to the cathode of the sixth diode, the anode of the seventh diode being connected at a sixth junction to the cathode of the eighth diode, the cathode of the fifth diode being connected at a seventh junction to the cathode of the seventh diode, the anode of the sixth diode being connected at an eighth junction to the anode of the eighth diode, the seventh junction being connected to the bus bar;
(f) a second thyristor having an anode connected to the seventh junction and a cathode connected to the eighth junction, the second thyristor breaking the connection between the seventh and eighth junctions in response to occurrence of an accident in at least one of the power supply lines of the second pair;
(g) a third switch connected between the fifth junction and one of the power supply lines of the second pair;
(h) a fourth switch connected between the sixth junction and the other power supply line of the second pair;
and
(i) a fifth switch connected between the fourth junction and the eighth junction.

7 more elements

An apparatus for use in an electric car power supply system including AC power sources, AC-DC converters connected to the AC power sources for converting an AC power to a DC power and applying the DC power to a bus bar, a regenerative bus bar and DC-AC converters connected to the regenerative bus bar for converting a DC power to an AC power, the apparatus being connected between the bus bar and first and second pairs of power supply lines for supplying the DC power to an electric car, the power supply lines of each of the first and second pairs being arranged in series and disconnected electrically with a dead section, comprising:

(a) a first diode bridge having first, second, third and fourth diodes each having an anode and a cathode, the anode of the first diode being connected at a first junction to the cathode of the second diode, the anode of the third diode being connected at a second junction to the cathode of the fourth diode, the cathode of the first diode being connected at a third junction to the cathode of the third diode, the anode of the second diode being connected at a fourth junction to the anode of the fourth diode, the third junction being connected to the bus bar;
(b) a first thyristor having an anode connected to the first junction and a cathode connected to the fourth junction, the first thyristor breaking the connection between the third and fourth junctions in response to occurrence of an accident in at least one of the power supply lines of the first pair;
(c) a first switch connected between the first junction and one of the power supply lines of the first pair;
(d) a second switch connected between the second junction and the other power supply line of the first pair;
(e) a first stopper diode having an anode connected to the fourth junction and a cathode connected to the regenerative bus bar;
(f) a third switch connected in parallel with the first stopper diode;
(g) a second diode bridge having fifth, sixth, seventh and eighth diodes each having an anode and a cathode, the anode of the fifth diode being connected at a fifth junction to the cathode of the sixth diode, the anode of the seventh diode being connected at a sixth junction to the cathode of the eighth diode, the cathode of the fifth diode being connected at a seventh junction to the cathode of the seventh diode, the anode of the sixth diode being connected at an eighth junction to the anode of the eighth diode, the seventh junction being connected to the bus bar;
(h) a second thyristor having an anode connected to the seventh junction and a cathode connected to the eighth junction, the second thyristor breaking the connection between the seventh and eighth junctions in response to occurrence of an accident in at least one of the power supply lines of the second pair;
(i) a fourth switch connected between the fifth junction and one of the power supply lines of the second pair;
(j) a fifth switch connected between the sixth junction and the other power supply line of the second pair;
(k) a sixth switch connected between the fourth junction and the eighth junction;
(l) a second stopper diode having an anode connected to the eighth junction and a cathode connected to the regenerative bus bar;
and
(m) a sixth switch connected in parallel with the second stopper diode.

11 more elements

Dependencies are inferred from the claim text.

Facts

Application: 06/883,998Filed 10 Jul 1986
Priority: JP 60-15369812 Jul 1985
Granted: 15 Mar 1988
Term ends: Not estimatedThe source records don’t support an estimate.

Classification73 codes

B61B 13/12
Other railway systems: systems with propulsion devices between or alongside the rails, e.g. pneumatic systems
B22D 11/0605
Into moulds with travelling walls, e.g. with rolls, plates, belts, caterpillars: formed by two belts, e.g. Hazelett-process
B22D 11/0685
For cooling the cast product during its passage through the mould surfaces: by cooling the casting belts
B22D 41/34
Plates therefor: supporting, fixing or centering means therefor