What effect will stopping the wagon at the point of contact between the pantograph and an insulator trigger?
Show the correct answer
Correct answer
A. Loss of wagon start-up and operation of the inverter.
Explanation
This question is about stopping the tram car at the point where the pantograph touches an insulator of the overhead contact line. This will cause loss of the tram car's start-up and of the converter's operation - the answer is A.
The overhead contact line is divided into power supply sections separated by section insulators. A pantograph standing exactly on an insulator has no contact with the live wire, so the tram car loses power: it cannot start up, and the converter stops working. That is why insulators are passed using momentum and the tram does not stop under them. The track brakes (answer B) do not come on for this reason, and the stop itself does not damage the pantograph insert (answer C). In such a situation, help is needed.
Legal basis: Art. 66 para. 1 point 1 of the Road Traffic Act (Prawo o ruchu drogowym)