Hissing Sound from High Voltage Power Transmission Line: Troubleshooting

Hissing Sound from High Voltagge Power Transmission Line

Troubleshooting the hissing sound from cable termination just after energization the high voltage transmission line.

Hissing sound troubleshooting for high voltage underground XLPE cable electrical power transmission line after successful commissioning test. The badly hissing sound coming from the cable termination port area into the panel. Due to the newly constructed line just energizing, so switch off immediately hearing the hissing sound. 

How Troubleshoot the Hissing Sound Problem Coming from High Voltage Terminal Port?

Troubleshooting in any field is not possible to list up the troubles that will happen, any new problem may occur any time. A good troubleshooter actually applies his previous experiences on probabilities. 

We were energizing the newly constructed 33kV underground XLPE cable transmission double circuits line after complete the successful pre-commissioning all site tests. 

One circuit energized without any problem, but the second circuit made trouble- hissing sound from cable termination port panel situated at power receiving substation. 

We cannot realize the hissing sound for a long time, the client's engineer instructed to switch off the line without any delay to avoid any provable power interruption in the whole substation.

We actually don't know the cause of sound and source of the sound,  is it for faulty cable or cable accessories? or, another reason that not cable lines related.

Similar problem happened in another 132kV power cable project, after energization hissing sound was comming from cable sealing end termination at gantry area, finally we troubleshoot that there is no any problem with cable lines or cable accessories, a simple problem is in cable sealing end support steel structure, there was a loose bolt on structure that was vibrating dueto energized line and generating hissing noise.

 So, we attempted to troubleshoot and the first step to physical check. Our target to find something that remains loose contact because if the cable or cable accessories like cable termination is faulty, it never gives time to switch off the line, it becomes shut down by itself immediately.

Opening the cable termination port panel and primary observation, we found that the technician made some mistake to earth the dummy plug connection. 

Look at the picture, you will find the difference in between before troubleshooting and after troubleshooting. A green-yellow grounding conductor for Blue Phase dummy plug at the right end is missing.

After connecting the grounding wire correctly as the right side after-troubleshooting picture, we switch on the circuit again and operating successfully.


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