The method applied today to supply current for rolling stock repair at a depot provides for supply of hazardous (for people health) current to electric buses fixed on the depot ceiling. Carriages with electrically connected flexible cables (rods) are moved along the buses. The rods are equipped with sockets which are put on contact fingers of wagon current-consuming devices (herein and after refer as consumers). Upon testing consumers operation, current is delivered through the contact fingers to the sockets.

Under the new technology, contact fingers are placed in boxes containing safety devices. These safety devices, located on both sides of a wagon under its body above the current trolley (collector) level, are connected in series and prevent access to certain contact fingers. To test workability, the safety device installed in the respective box is removed. When the test is completed, the socket is removed, thus leaving space for installation of the safety device in its origin position.

The second modification of the method presumes application of shorter flexible cables (rods) than those which are used in a working area. The length of shorter flexible cables allows to easily put on the socket on the contact finger installed in the said box, and prevents from putting on it on the contact finger of the wagon trolley.

Electric circuit of the wagon is also described in the patent. Typical wagon, equipped with a trolley and a contact finger installed on it, where the trolley is installed under the wagon body on one side of the wagon and is made as a box with built-in safety devices fixed in spring clamps, is now equipped with additional box with a built-in safety device. Dielectric socket where additional contact finger is installed is firmly fixed in each box. The axis of the safety device and the contact finger lay in one plane. The safety devices are connected in series and located between the trolley and current consumers. One additional contact finger is connected with first safety device feeding circuit, and the second is installed after the second safety device. The main breaker contacts of wagon motors are connected with the feeding circuit before the first safety device (these changes improve safety and efficiency of repair).

V.P.Ermolov

Wagon depot Krasnaya Presnya, Moscow subway

123002, Moscow, ul. Khodynskaya 3, Wagon depot Krasnaya Presnya, Moscow subway

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