Power supply installation for DC electric railroad

• US 4,731,723 A
• Filed: 07/10/1986
• Issued: 03/15/1988
• Est. Priority Date: 07/12/1985
• Status: Expired due to Fees

• Current Assignee: Kabushiki Kaisha Meidensha (Meidensha Corporation)
• Original Assignee: Kabushiki Kaisha Meidensha (Meidensha Corporation)
• Inventors: Tamura, Tuneo, Nogi, Teiji, Gondo, Toyomi, Sato, Hiroyasu
• Primary Examiner(s): Salce, Patrick R.
• Assistant Examiner(s): Hoff, Marc S.
• Application Number:
  US06/883,998
• Time in Patent Office: 614 Days
• Field of Search: 361/62, 361/63, 361/100, 363/53, 363/54, 363/69, 363/70, 363/84, 363/128, 363/129
• US Class Current: 363/70
• CPC Class Codes: B22D 11/0605 formed by two belts, e.g. Hazelett-process
• CPC Class Codes: B22D 11/0685 by cooling the casting belts B22D11/0677 takes precedence
• CPC Class Codes: B22D 41/34 Supporting, fixing or centering means therefor
• CPC Class Codes: B25C 5/0292 with the objects to be stapled together introduced perpendicularly to the longitudinal axis of the tool in an opening formed by an anvil and a plunger
• CPC Class Codes: B27K 2240/30 Fireproofing fireproofing materials in general C09K21/00
• CPC Class Codes: B27K 3/0292 for improving fixation B27K3/0285 takes precedence
• CPC Class Codes: B27K 3/08 Impregnating by pressure , e.g. vacuum impregnation
• CPC Class Codes: B27K 3/22 Compounds of zinc or copper
• CPC Class Codes: B27K 3/34 Organic impregnating agents polymers B27K3/15
• CPC Class Codes: B27K 3/52 Impregnating agents containing mixtures of inorganic and organic compounds
• CPC Class Codes: B27K 5/001 Heating
• CPC Class Codes: B29C 48/07 Flat, e.g. panels
• CPC Class Codes: B29C 48/08 flexible, e.g. films
• CPC Class Codes: B29C 48/21 the layers being joined at their surfaces
• CPC Class Codes: B29C 48/307 specially adapted for bringing together components, e.g. melts within the die
• CPC Class Codes: B29K 2033/00 Use of polymers of unsaturated acids or derivatives thereof as moulding material B29K2035/00 takes precedence
• CPC Class Codes: B29K 2055/02 ABS polymers, i.e. acrylonitrile-butadiene-styrene polymers
• CPC Class Codes: B29L 2031/7692 Baths
• CPC Class Codes: B32B 27/30 comprising vinyl (co)polymers; comprising acrylic (co)polymers
• CPC Class Codes: B41F 13/14 with means for displacing the cylinders
• CPC Class Codes: B41F 13/16 : with means for displacing the printing formes on the cylinders
• CPC Class Codes: B60B 39/006 : characterised by a control system for the actuation of the rotating chain wheel
• CPC Class Codes: B60M 3/04 : Arrangements for cutting in and out of individual track sections by passage of the vehicle B60M1/10
• CPC Class Codes: B60W 10/02 : including control of driveline clutches
• CPC Class Codes: B60W 10/06 : including control of combustion engines
• CPC Class Codes: B60W 10/10 : including control of change-speed gearings
• CPC Class Codes: B60W 10/11 : Stepped gearings
• CPC Class Codes: B60W 2050/021 : Means for detecting failure or malfunction
• CPC Class Codes: B60W 2510/0638 : Engine speed
• CPC Class Codes: B60W 2510/102 : Input speed change rate
• CPC Class Codes: B60W 2510/104 : Output speed
• CPC Class Codes: B60W 2540/12 : Brake pedal position
• CPC Class Codes: B60W 30/18 : Propelling the vehicle
• CPC Class Codes: B61B 13/08 : Sliding or levitation systems vehicles with air cushions between rails and vehicles B60V3/04
• CPC Class Codes: B61B 13/12 : Systems with propulsion devices between or alongside the rails, e.g. pneumatic systems cable traction B61B9/00; car shunting devices B61J
• CPC Class Codes: B65D 83/70 : Pressure relief devices
• CPC Class Codes: F16H 2061/1208 : with diagnostic check cycles; Monitoring of failures
• CPC Class Codes: F16H 2061/122 : Avoiding failures by using redundant parts
• CPC Class Codes: F16H 2061/1284 : the failing part is a sensor
• CPC Class Codes: F16H 59/36 : Inputs being a function of speed
• CPC Class Codes: F16H 59/40 : Output shaft speed
• CPC Class Codes: F16H 59/42 : Input shaft speed
• CPC Class Codes: F16H 61/12 : Detecting malfunction or potential malfunction, e.g. fail safe in control of hydrostatic gearing F16H61/4192; Circumventing or fixing failures
• CPC Class Codes: F16K 17/162 : of the non reverse-buckling-type F16K17/1633 takes precedence
• CPC Class Codes: H01G 9/12 : Vents or other means allowing expansion
• CPC Class Codes: H01M 50/3425 : in the form of rupturable membranes or weakened parts, e.g. pierced with the aid of a sharp member
• CPC Class Codes: Y02E 60/10 : Energy storage using batteries
• CPC Class Codes: Y02T 10/70 : Energy storage systems for electromobility, e.g. batteries
• CPC Class Codes: Y02T 30/00 : Transportation of goods or passengers via railways, e.g. energy recovery or reducing air resistance
• CPC Class Codes: Y10S 101/36 : Means for registering or alignment of print plates on print press structure
• CPC Class Codes: Y10S 477/906 : Means detecting or ameliorating the effects of malfunction or potential malfunction
• CPC Class Codes: Y10T 428/662 : Wood timber product [e.g., piling, post, veneer, etc.]

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.

Claims

1. 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. 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.

3. 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.

4. The apparatus as claimed in claim 3, which comprises a ninth diode having an anode connected to the cathodes of the first and second stopper diodes and a cathode connected to the regenerative bus bar and a tenth diode having an anode connected to the cathode of the ninth diode and a cathode connected to the bus bar.