Background

The modernization of Warsaw’s tramway system brought new challenges related to protecting power lines from surges. The existing technology was inadequate for safeguarding the advanced electronics of the new streetcars, leading to operational issues. Failures in power mains equipment had cascading effects, causing malfunctions in safety-critical systems such as switches and track switches. Additionally, repairing surge-damaged components, including power converters, led to increased expenses.

The Challenge

Selecting the right surge arresters was difficult due to a lack of knowledge about the specific surge parameters. These surges resulted from both lightning strikes and the daily operations of the tramway fleet and equipment. Therefore, the initial task was to identify vulnerable zones within the power supply network and understand the disruptions occurring in these areas.

Our Solution

Our collaboration began with a comprehensive inspection of the tramway infrastructure. To analyze surge parameters, our expert conducted numerous diagnostic runs on a streetcar equipped with specialized monitoring devices. These runs recorded disturbances, enabling us to select surge arresters with the appropriate specifications and determine the best installation sites.

From the start of the project to the delivery of an effective solution, the process took less than six months. We installed the selected surge arresters and monitored their performance over a 12-month period, as outlined in the contract. During this time, we regularly collected data, observed phenomena, and incorporated the Partner’s feedback through phone and email exchanges.

The rapid resolution of surge-related issues in Warsaw’s tram network led the Partner to reduce the initial operational timeframe by one year and include our product in their technical documentation for future tram network applications.

Outcomes

Through extensive consultations, both remote and on-site, we provided Warsaw Trams with over 1,000 surge arresters of various types. Additionally, we recorded emerging surges, pinpointed their sources and locations, and measured the characteristic parameters of the disturbances. We also continuously coordinated the overvoltage protection of the traction power system. Our ongoing cooperation ensures we remain available for any surge protection consultations needed.

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