Category Archives: Testing & Commissioning

During transformer commissioning, one of the most important diagnostic procedures is the power factor test. This test assesses the dielectric losses in the transformer’s insulation system, which are directly related to insulation quality and integrity. For dry-type transformers, the power factor test helps identify potential insulation deterioration due to moisture, contamination, carbonization, or other degradation mechanisms that may… Read More »

Dry-type transformers are integral to the electrical infrastructure of industrial, commercial, and institutional facilities. Because these transformers power critical systems, regular electrical testing and maintenance are essential to ensure safety, reliability, and performance. This article summarizes recommended electrical tests and maintenance practices for dry-type transformers rated 500 kVA and above, based on ANSI/NETA MTS-2019 (Maintenance Testing Specifications) and… Read More »

Insulating materials are fundamental to the safe and efficient operation of electrical systems, serving to separate conductive parts from non-conductive ones and prevent unintended current flow. In high-voltage equipment such as motors, generators, transformers, and cables, insulation integrity directly impacts reliability, with studies estimating that up to 98% of electrical failures originate from insulation degradation due to factors… Read More »

The tan delta test, formally known as dissipation factor or power factor testing, is a fundamental diagnostic technique in high-voltage electrical systems. It quantifies the dielectric losses in insulation materials, offering critical insights into their condition and susceptibility to failure. In the realm of generators, this test is primarily applied to stator windings, which endure continuous electrical, thermal,… Read More »

In the field of electrical engineering, where the reliability of energy networks is paramount, maintaining the insulation of equipment is a critical challenge. An insulation failure can lead to costly outages, safety risks, or even widespread blackouts. Among the most effective and widely used diagnostic tools is the Tan Delta test, also known as the Dissipation Factor Test… Read More »