11kV Transformers | Bushing Oil Leak on High Voltage Distribution Transformers

THORNE & DERRICK LV HV Jointing, Earthing, Substation & Electrical Eqpt
Guest Article by Simon Brown (Ipsum Utilities - Private Networks)

Video | This is an 11kV bushing oil leak on a 500kVA distribution transformer. Most likely caused by the end gaskets of the bushing having been penetrated and then the rubber flexible boot has held the oil until I released it as seen in the video. We will be isolating the transformer to drop the oil level below the bushing, remove it and replace its gaskets before putting it all back together – the cork gaskets on either end of the bushing have been penetrated by the transformer oil and it has travelled from the main tank to the 11kV cable box through the bushing. The rubber flexible bushing boot insulating the 11kV cable connection integral to the heat shrink cable termination was holding it back until I released the pressure.

This video demonstrates the critical value of cyclical inspection and maintenance of substation equipment as required by law associated with the installation and on-going maintenance of high and low voltage equipment, including substations.

Read Blog https://www.powerandcables.com/transformer-oil-leak/

Further Reading
Cable Asset Management | A Scientific Approach https://www.powerandcables.com/cable-asset-management/
66/69kV Cable System Performance | Jointer Error Concerns https://www.powerandcables.com/66kv-jointer-error/
The Semicon Screen – The Most Critical Point In Any MV Cable Joint, Termination Or Connector https://www.powerandcables.com/the-semicon-screen/
HV Competent Cable Jointing | Expert & Perfect Semicon Screen Preparation
https://www.powerandcables.com/jointing-hv-cables-11kv-33kv/
I'm Now A 4 Day Cable Jointer https://www.powerandcables.com/cable-jointer/
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Thorne & Derrick International are specialist distributors of LV, MV & HV Cable Installation, Jointing, Duct Sealing, Substation & Electrical Equipment – servicing UK and global businesses involved in cable installations, cable jointing, substation, overhead line and electrical construction at LV, 11kV, 33kV, 66kV and EHV.

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