Contents
Which are the reason for transformer fault?
Most Common Causes of Failures
| Lighting Surges | Line Surges/External Short Circuit |
|---|---|
| Poor Workmanship-Manufacturer | Deterioration of Insulation |
| Overloading | Moisture |
| Inadequate Maintence | Sabotage, Malicious Mischief |
| Loose Connection |
Why do we test transformers?
Turns ratio transformer testing is commonly used to ensure that the winding ratio between the primary and secondary coils are aligned to recommended specifications. This type of transformer testing also ensures the transformer will provide either step-up or step-down voltage.
Are there any on line diagnostics for Transformers?
While on-line diagnostic systems and computerized testing methods are very helpful, they are not a substitute for sound engineering judgment and expertise. This volume provides timely, practical advice to those seeking to better understand how transformers work, how they are best maintained, and how to test and evaluate their condition.
How can you tell the condition of a transformer?
1. Doble Power Factor. A good indication of insulation deterioration is a slowly rising power factor. Doble insulation testing is an important step in determining the condition of the transformer because it can detect loss of winding insulation integrity, loss of bushing insulation integrity, and winding moisture.
How does the DGA test work on a transformer?
The DGA test measures dissolved gases in the transformer oil and is capable of detecting: arcing, bad electrical contacts, hot spots, partial discharges, overheating of conductors, oil, tank, and cellulose (paper insulation) degradation.
How is a fault detector used in a transformer?
A fault detector equipped with a data logger can be used to detect internal partial discharge, arcing, sparking, pump impeller and bearing problems. This test is also useful in pinpointing mechanical noises and loose parts (blocking, deflectors, etc.). Care should be taken because this method requires contact with the transformer while energized.