At Johnson & Phillips, we carry out all aspects of transformer services included installations, repair and testing. We work nationwide and perform regular electrical tests in order to ensure all transformers are operating to their maximum efficiency.
Repairing a transformer that has been running incorrectly for too long can be costly to repair. Such negative effects include overloading, overheating, aging moisture (acid, oxygen, leakages), mechanical damage, short circuits, switching surges and much more.
In terms of our transformer testing process, we check for mechanical changes to windings, shorted windings/coils, contact issues within the tap changer, short circuits of the parallel lines and much more. Our team at Johnson & Phillips can diagnose all these issues early on and prevent costly damage to the transformer and further increase the life span.
Transformer Oil Testing
The oil used within a transformer is required for insulating and cooling. Overtime, it can deteriorate and require testing to ensure that it’s still fit for purpose. We provide transformer oil testing nationwide and ensure that the oil meets the high standards it need to be.
At Johnson & Phillips, we are equipped with the state of the art test equipment to perform transformer oil testing on site. The machine is applies a test voltage, which increases it intensity until a breakdown point of the oil is detected.
Transformer Oil Sampling
In order to test the oil, we take several samples where the physical and chemical properties will be tested. From the sampling, we are able to detect the moisture content, power factor, dielectric breakdown, acid number and much more.
Testing a Transformer
Our testing procedure can be broken down into certain sectors. These include bushings, CTs, leads, tap changer, insulation, windings and core. At Johnson & Phillips, we deal with these sorts of issues within each sector of a transformer on a regular basis.
Our team will also conduct an open circuit test and short circuit test of your transformer An open circuit test will result in the amount of iron that has been lost whereas the short circuit tests the core losses.
Once we have diagnosed an issue, we are not like most other companies that will leave you with the issue, we will go the extra mile and repair it too. Our corrective methods include replacing parts such as bushings, surge arresters, gaskets, pumps and fans as well as maintaining auxiliary components of the transformer.
Some of our transformer testing methods include:
- Winding Resistance
- Dynamic Winding Resistance of the Tap Changer
- Magnetising Current
- Short Circuit Impedance
- Transformer Ratios
- … and much more
Why Choose Us?
Our team are highly experienced with a range of transformers from 11Kv Switchgear to a range of other switchgear systems. We work 24/7 and have solutions to ensure your business is up and running whilst your transformer is being tested or repaired.