Abstract
High voltage (HV) infrastructures market is growing due to the corresponding growth in industries and population. To ensure continuous and reliable electrical power supply, existing substation and transmission lines are being upgraded to accommodate the additional load requirements. These upgrades involve up-rating the existing transmission lines or the installation of new lines. To save on easement cost and reduce the environmental impacts, transmission lines are occupied the same easement or path. This parallel option introduces the risk of induced voltage which could reach an unsafe condition and jeopardize the safety of works and people. This paper analysis and highlight the hidden risk associated with two parallel transmission lines that connected the same high voltage substation. The theoretical study which is supported by the case study shows the high risk potential tempering with the OHEW on the isolated circuit while the other one is still energized
Highlights
Electrical power forms an essential element for human daily ongoing activities
The transmission lines are essential to transfer the electrical energy between numerous high voltage infrastructures such as power station, bulk supply point, transmission substation and zone substation
Under continuous overhead earth wire (OHEW) condition, if the worksite is located in the middle of the transmission lines, the pole earth potential rise (EPR) under substation fault is at its minimum value
Summary
Electrical power forms an essential element for human daily ongoing activities. Numerous happenings would have been impossible without the aid of the electrical power. The pole earth grid current dives until reaches the zero value Based on these two figures, there is no pole earth potential rise (EPR) in the middle of the transmission line under substation fault. The return current in OHEW on TL2 behaves as per figures 4 and 5 under continuous OHEW condition Based on this information, works at the middle of the transmission line has minimum exposure to EPR under substation fault. HIDDEN RISK As previously discussed, the parallel arrangement of the transmission lines introduces the induced voltage risk Add to this fact that both transmission lines are connected to the same substation which traduced additional return current into the connected OHEW or earthed phase conductor. This hidden EPR on the OHEW, that usually considered the safest assets as it is earth at each pole, has the potential to cause serious damage to workers
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