Electric lamp and discharge devices: systems – With signal – indicator – or alarm – Radiant energy responsive control type
Patent
1981-03-16
1983-03-15
La Roche, Eugene R.
Electric lamp and discharge devices: systems
With signal, indicator, or alarm
Radiant energy responsive control type
246 28G, 315136, 315239, 340310A, 340641, H05B 3703
Patent
active
043769101
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
Field of the Invention
The present invention relates to a power supply and control device for the proper operation of a railway traffic light suitable for the detection of defects in an electrical line.
It is presently known that to insure the safety of railway traffic, it is indispensably necessary to monitor the proper operation of traffic lights. For this purpose, it is known to use a relatively complex supply and control device in series with the electrical supply line of the lights, which is insulated from the ground. The supply and control device comprises a relay which functions only when a given nominal current is circulating in the line. However, this assembly is expensive, and the length of the supply lines with which it can be used is limited.
SUMMARY OF THE INVENTION
It is the object of the present invention to eliminate these disadvantages. The present invention concerns a power supply and control device for the proper operation of a railway signal light and comprises a periodic current generator connected to a long electrical power supply line through a first isolation transformer. The electric lamp of the traffic light is connected with the long line through a second isolation transformer.
According to the invention, first and second safety capacitors with four terminals each are connected in series through a first pair of their terminals with the long line, the secondary coil of the first transformer, and the primary coil of the second transformer. The second pair of terminals of the first capacitor are connected with the coil of a relay supplied with continuous current. The second terminals of the second capacitor are connected to terminals of the outlet of a detector which detects the operation of the lamp and generates a direct current when the lamp is operating.
BRIEF DESCRIPTION OF THE DRAWINGS
The present invention shall become more apparent and further objects, characteristics and advantages of the invention will appear more clearly from the detailed description of the preferred embodiment of the invention set forth hereinafter, reference being had to the accompanying drawings in which:
FIG. 1 represents schematically a supply and control device according to the invention and
FIG. 2 shows in detail a preferred mode of embodiment of the detector of operation according to the invention.
DESCRIPTION OF THE PREFERRED EMBODIMENT
Referring now to FIG. 1, the detection of the state of the lamp 1 of the signal light is effected locally at the light by the detector 2. The information obtained is transmitted through the line 3 of the power supply of the lamp 1 to the coil of a relay 4, which transmits the information upstream to a central control station 5. This detection is not disturbed in any way by this fact, by means of the idle currents of the transformers increased by the capacitive current of the cable. More precisely, a generator 6 of periodic current is connected with the long line 3 through a first isolation transformer 7 and a switch 8 to control the light. The generator 6 may consist of a generator of sinusoidal alternating current or sawtooth current or a continuous current chopper, delivering for example a voltage of 127 Volts at a frequency of 400 Hertz. The lamp 1 is connected to the other end of the line 3, through a second isolation transformer. A four terminal safety capacitor 11 is placed in series with the secondary coil of the transformer 7, in the long line 3. Capacitor 11 is characterized in that it is equipped on each of its plates with two terminals electrically connected with each other by the plate itself.
A first pair of terminals of capacitor 11 is used for the series connection in the line 3. The second pair of terminals of the capacitor 11 is connected with the coil of a relay 4. Relay 4 operates in response to a continuous current and is insensitive to periodic currents. The relay 4 controls the opening or closing of a line 12, providing a display of the condition of the lamp 1 in a central control station 5.
A second s
REFERENCES:
patent: 2197700 (1940-04-01), MacGregor
patent: 2860263 (1958-11-01), Sparrow
patent: 2905861 (1959-09-01), Ganzenhuber
patent: 3026448 (1962-03-01), Brown
Jeumont-Schneider
La Roche Eugene R.
LandOfFree
Power supply and control device for the proper operation of a ra does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Power supply and control device for the proper operation of a ra, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Power supply and control device for the proper operation of a ra will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1659375