CASE STUDY - Dehumidifier Hire for Transformer Repair

Supplier: Humiscope By: Humiscope
24 November, 2021

Temporary dehumidifier hire for climate control. The maintenance work required temperature specific, very low humidity environment to maintain the integrity of the transformers.

DEHUMIDIFIER HIRE: EXECUTIVE SUMMARY

Our client was required to carry out maintenance on specialised transformers. To complete this maintenance work, a temperature specific, very low humidity environment was required to maintain the integrity of the transformers. 

Equipment such as transformers need to be kept in a low humidity environment for any repairs and maintenance. Accordingly, Humiscope supplied desiccant dehumidifiers to control humidity levels inside purpose built maintenance buildings. 

 

DEHUMIDIFIER HIRE: ACHIEVEMENTS 

Humiscope supplied 2 industrial dehumidifiers and 2 portable air conditioners

  • Created the low humidity environment required for repair works
  • Lowered relative humidity (RH) to below 5% RH at 27 degrees Celsius

CHALLENGE: CREATING LOW HUMIDITY ENVIRONMENT

Many large power generation sites throughout Australia have transformers to change voltage of power for transportation. These transformers require regular maintenance and, from time to time, repair. Repair work to transformers must be carried out in a very specific environment.

The ideal humidity and temperature is 5% RH and 27 degrees Celsius. These transformers can be located on remote sites throughout Australia and can have varying environmental conditions that need to be taken into consideration when scheduling maintenance. 

When a transformer requires maintenance, it is required to be disconnected and stripped. This exposes electrical connections and parts. If moisture was to form on any of these parts, the transformer will not function correctly once reassembled and reconnected to electricity.

Without any humidity control in the maintenance room, the risk of the above issues was of high concern. It was for this reason that the project manager contacted Humiscope.   

 

SOLUTION: CONTROL RELATIVE HUMIDITY LEVELS WITH DEHUMIDIFICATION

Humiscope achieved the ideal RH and temperature using a combination of pre-cooled air and desiccant dehumidifiers. Desiccant dehumidifiers remove moisture from the air using a rotating desiccant wheel. The large surface area of this honey comb like structure absorbs moisture from the air, lowering the absolute humidity level of the air pumped into the transformer maintenance area. These units have a robust construction, easy and simple maintenance, with a very long operating life.

 

DEHUMIDIFIER HIRE: RESULTS AND RETURN ON INVESTMENT

After discussions with Humiscope techs and engineers, the company decided to hire desiccant dehumidifiers and air conditioners from our rental fleet. This was to provide short term controlled environment while repairs and maintenance were carried out.  

The units are able to be transported to specific sites as required for repairs and maintenance. 

The maintenance personnel then had the ability to conduct on-site maintenance without any risk to the transformers. Dehumidifiers are connected to an air inlet and blow air through the pipes. The dehumidifiers supplied are transportable and are easily connected with ducting when required.