Developments in communication have done much to realize the digital substation, but to realize a full digital substation it is necessary to have everything in digital form. Whilst much substation… Read more
Jul 25, 2018 | Edvard
There are many methods applied to bolster the short circuit withstand capability of the transformers: improvement of the materials, reforming of the design and good maintenance in the operation process… Read more
Jun 13, 2018 | Edvard
Transformers are important system components available in many different constructions. The range of HV transformers reaches from small distribution transformers (from 100 kVA) up to large transformers having several hundred… Read more
May 14, 2018 | Edvard
Even with the best engineering practices, abnormal situations can arise that may produce damage to power transformer and other equipment and compromise the continuity of the delivery of quality power… Read more
May 02, 2018 | Edvard
Because of the predominantly inductive character of the power system, an active power flow between source and load must be accomplished with a phase lag between the terminals. Phase-shifting transformers… Read more
Apr 23, 2018 | Edvard
Like all other power system systems, no matter how carefully the system is designed, losses are present and must be modeled before an accurate representation of the system response can… Read more
Feb 21, 2018 | Edvard
Substation AC auxiliary systems are typically used to supply loads such as transformer cooling, oil pumps, and load tap changers, circuit breaker air compressors and charging motors, outdoor device heaters,… Read more
Feb 14, 2018 | Edvard
The protection that is recommended and commonly applied for transformers is summarized in the following figures. It should be noted and recognized that these are general recommendations, not strict. More… Read more
Jan 12, 2018 | Edvard
When applying differential protection of power transformer, three bad conditions must be considered which can lead to unbalance to the currents applied to the relay (compared with the expected currents… Read more
Dec 27, 2017 | Edvard
Almost all transformers incorporate some means of adjusting their voltage ratio, by adding or removing tapping turns. This adjustment may be made by an on-load tap-changer, or by means of… Read more
Dec 06, 2017 | Edvard
