PCB Training workshop in Istanbul 15 -19 July 2013
Retrofilling transformer with decontamination
Retrofilling transformer : Emptying the equipment of its dielectric fluid and replacing this with new PCB free oil or refurbished
Retrofilling transformer with decontamination Parameters affecting the decision for Retrofilling or not: -Importance of this transformer; -Location; -External condition of transformer, data of manufacture; (leaks, corrosion ) -Functionality of transformer; -Cost for disposal replacing of replaced oil; -Cost to purchase new transformer; -Cost of replacing the oil; -PCBs concentration of the oil.
Retrofilling transformer with decontamination Important informationâ€™s for supporting the decision between retrofilling the transformer or replace with a new transformer: -Simple replacement will reduce the contamination to 10%; -Cost effectiveness decontamination, for power transformers, if the max concentration of 500ppm, for in situ PCB decontamination method; -Higher contaminated transformers are technically possible to treat but the cost is rising a lot; -A new transformer costs three time more than the disposal costs of a transformer;
Retrofilling decision taking
The improvement of the dielectric properties of used oil can be performed using mobile or stationary systems. Those systems consist of: -Vacuum system; -Two or three phase decanter; -Filter for particles and trap for dehydration of the oil.
Retrofilling and decontamination Case study The dielectric oil from a power transformer is contaminated with PCBs; (identified)
Act as follows: -Plan within the next retrofilling and the in situ PCBs decontamination -Ask specialized subcontractors to do the Retrofilling transformer and simultaneously to destroy the PCB from the oil. Usually they use to destroy PCBs sodium.
Retrofilling – decontamination-Sampling
Verifying decontaminations success!!
After 90 days of finishing the decontamination process the PCBs level in the oil must remain under 50ppm. (porous parts dilutes PCB in the treated oil)
Consider that after finishing the decontamination
because the porous materials absorbs PCBs the oil measured PCBs concentrations should be between 1020 ppm.
Retrofilling â€“ waste disposal
ď‚— The waste arising from retrofilling are classified as possible hazardous waste and must be disposed according the local regulations.
Retrofilling – waste disposal Than you very much for your attention
Panos Ioakimidis firstname.lastname@example.org email@example.com