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Archive: Category «Protection»

Transformer differential protection (ANSI 87T)

Transformer differential protection protects against short-circuits between turns of a winding and between windings that correspond to phase-to-phase or three-phase type short-circuits. If there is no earthing connection at the… Read more

Sep 05, 2012 | Edvard

SIPROTEC 4 7UT6 Differential Protection Relay for Transformers

Delayed Auto-Reclosing On EHV Systems

On highly interconnected transmission systems, where the loss of a single line is unlikely to cause two sections of the system to drift apart significantly and lose synchronism, delayed auto-reclosing can be employed…. Read more

Aug 11, 2012 | Edvard

Delayed auto-reclose scheme logic

Overvoltages in the IT system

Electrical networks can be subject to overvoltages of varying origins. Some overvoltages, such as differential mode ones (between live conductors) affect all the earthing systems. This section is particularly concerned… Read more

Jul 26, 2012 | Edvard

Single insulation fault on a network operated in IT earthed system

Effect of Lightning Strike on Electrical Lines

The foregoing discussion concentrated on the principles of lightning strikes and how their effects can be mitigated. However, lightning strikes on electrical lines or substations are those that cause problems… Read more

Jul 20, 2012 | Edvard

Effect of lightning strike on electrical lines

Thermal (Overload) Motor Relay Protection

The majority of winding failures in motor are either indirectly or directly caused by overloading (either prolonged or cyclic), operation on unbalanced supply voltage, or single phasing, which all lead… Read more

Jul 14, 2012 | Edvard

Thermal (Overload) Motor Relay Protection


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