MV/LV transformer protection against temperature rise, overloads, short-circuit & overvoltages
When selecting the type of transformer correctly electrical engineer needs to know its different electrical and thermal properties and the resistance to stresses due to faults or normal service of the transformer itself. This is… Read more
Sep 26, 2018 | Edvard
Busbar protection schemes for distribution substations
Busbars play an important role in power transmission and distribution. They are employed as a central distribution point for all feeders. In the case of a fault, current on the busbar becomes high, resulting to… Read more
Sep 24, 2018 | Edvard
How to know if you set the correct current on a motor thermal overload relay
The full-load current at a given voltage indicated on the nameplate is normative for setting the overload relay. Because of the variable voltages around the world, motors for pumps are made to be used at… Read more
Sep 19, 2018 | Edvard
Secondary equipment you should always consider when retrofitting existing HV substation
This approach assumes retrofitting and upgrading old substation secondary equipment such as intelligent electronic devices (IEDs), monitoring sensors, power apparatus, communication protocol and operating standards to improve the overall performance or reduce cost without disrupting… Read more
Sep 17, 2018 | Edvard
DC versus AC power transmission with reference to bulk-energy transfer
High voltage transmission systems has a dual purpose, i.e. system interconnection and bulk-energy transfer. With reference to system interconnection, the need to operate the whole system in perfect synchronism often prevents the transfer of power…...
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Sep 14, 2018 | Edvard
Relay settings and applying high-impedance differential busbar protection scheme
The most of HV busbur faults involve single phase and earth, but faults may arise from many different causes. The number of faults that stand out is between phases clear of earth. In fact, a… Read more
Sep 12, 2018 | Edvard
Earth fault protection of an AC motor in four different earthing systems
One of the most common faults to occur on a motor is a stator winding fault. Whatever the initial form of the fault (phase phase, etc.) or the cause (cyclic overheating, etc.), the presence of… Read more
Sep 10, 2018 | Edvard
Applying CTs in protection schemes for transformers, generators, machines etc.
Various types of instrument transformers are currently in use on the basis of the varied applications of these devices. The construction aspects and sizing play an important role in the selection of proper types of… Read more
Sep 05, 2018 | Edvard
The essentials of electrical distribution systems every engineer should know
Electrical distribution systems are an essential part of the electrical power system. In order to transfer electrical power from an alternating current (AC) or a direct current (DC) source to the place where it will… Read more
Sep 03, 2018 | Edvard
