On 7th August 2019, Viper Innovations received a request for assistance from Network Rail London North Western. They were experiencing extremely low Insulation Resistance (IR) on the West Coast Main Line at Euxton ASC, consisting of 6 feeders across 11 miles. A sudden drop of the signalling system Insulation Resistance caused an alarm to be raised to Network Rail by their Intelligent Infrastructure. Low IR means that the signalling system was at risk of failure and, therefore, it was critical to locate the fault and make repairs as soon as possible to avoid costly train delays. Network Rail had subsequently attempted to locate the fault using an existing IR fault detection system. However, the equipment had proved to be highly ineffective at determining the location and, in fact, had pointed the Network Rail team to the wrong feeder and cable sections which wasted crucial time.
The Viper team mobilised on the morning of 10th August 2019 and, using CableGuardian in a Tier 2 configuration temporarily connected to the 650V SPS, the fault was isolated to 2 suspect Feeders within only 1.5 hours. Additional testing was then conducted on the 2 suspect Feeders by temporarily connecting CableGuardian units to a number of location cases forming a Tier 1 configuration. This resulted in the fault being isolated to a 1 mile long Sub-Network Section within 3 further hours. Due to Network Rail time constraints, it was not possible to conduct more tests to isolate the fault to an even smaller section of the SPS on the day. However, CableGuardian had significantly reduced the fault location down from 11 miles across 6 Feeders to just 1 mile on 1 Feeder, allowing Network Rail teams to focus their efforts.
Find out more about CableGuardian >