Retrofilling
When Midel was first introduced one of its major applications was replacing Polychlorinated Biphenyls (PCBs) in existing distribution transformers. Commonly referred to as retrofilling, the focus today has shifted towards capitalising on the benefits of retrofilling mineral oil transformers with Midel.
Customers usually retrofill transformers to improve service life, reduce environmental hazards or increase fire safety. The process is very simple because the thermal expansion characteristics, cooling performance and electrical properties are comparable to those of mineral oil.
When retrofilling with Midel (k-class) you can increase the transformer fluid's fire point from around 170°C to approx 300°C. As well as making the transformer much safer, our customers also report that switching to a K-class fluid such as Midel can dramatically reduce the cost of their insurance premiums.
Furthermore, retrofilling with Midel could also improve the service life where exposure to high humidity levels has had a negative impact on the mineral oil. This has been demonstrated in field trials where Midel was used to bring transformers with very wet cellulose back into operation by a simple retrofilling operation.
Why Retrofill with MIDEL 7131?
Increased Fire Safety
- K-Class high fire point (>300°C) TO IEC 61100
- 100% fire safety record
- FM Global approved transformer fluid
High Performance
- Fully miscible with mineral oil
- Suitable for breathing systems, no need to retroseal
- Robust and stable, conducive to lower levels of maintenance
- Greater moisture tolerance than mineral oil, silicone liquid and natural ester
- Excellent reliability, reputation as the ‘fill and forget fluid'
- No corrosive sulphur - ASTM D1275 B and IEC 62535
Environmental Protection
- Readily biodegradable according to OECD 301 and fully biodegradable according to IEC 61039
- Non-toxic and non-water hazardous
Excellent Customer Service
- Multilingual commercial team
- First-rate customer care
- Continued technical support from the transformer fluid experts
