Protecting Motor From External Network Disturbances (Unbalance, V/Hz-ratio and Re-Energizing)
Unbalance in the supply voltage is typically due to a broken phase condition somewhere in the upstream network. This may result from single-phase fuse failure or pole discrepancy of a… Read more
Jan 29, 2018 | By Edvard Csanyi
How to control and protect capacitor banks before something goes wrong
The purpose of a capacitor bank’s protective control is to remove the bank from service before any units or any of the elements that make up a capacitor unit are… Read more
Jan 24, 2018 | By Edvard Csanyi
Recommended and commonly applied protection for transformers
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 | By Edvard Csanyi
Protection Of Industrial Power Supply Systems (Fuses, MCCBs and Overcurrent Relays Settings)
As industrial operations processes and plants have become more complex and extensive, the requirement for improved reliability of electrical power supplies has also increased. The potential costs of outage time… Read more
Jan 02, 2018 | By Edvard Csanyi
3 Bad Conditions That Cause False Differential Current In Power Transformer
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 | By Edvard Csanyi
10 Common Questions You Can Expect In Electrical Engineering Examination Test
This examination will focus on testing the fundamentals of electrical engineering from low voltage to high voltage. Of course, you can use huge EEP’s resources for help in calculations and… Read more
Dec 26, 2017 | By Edvard Csanyi
Primary injection testing of protection system for wiring errors between VTs / CTs and relays
This type of test involves the entire circuit – current transformer primary and secondary windings, relay coils, trip and alarm circuits, and all intervening wiring are checked. There is no… Read more
Dec 13, 2017 | By Edvard Csanyi
Protections For Medium Voltage Synchronous Machines (Generators) – IEEE C37-2 Codes
The protection system for MV generators (synchronous machines) must be carefully selected and studied for the application it is destined for and it is not normally possible to define a… Read more
Dec 04, 2017 | By Edvard Csanyi
Secondary injection tests for checking the correct operation of the protection scheme
Secondary injection tests are always done prior to primary injection tests. The purpose of secondary injection testing is to prove the correct operation of the protection scheme that is downstream… Read more
Nov 22, 2017 | By Edvard Csanyi
Differential Protection Of Feeders For Transformers And Tee-Offs (Tapped Lines)
On transformer feeders, the transformer and line or cable are connected in series and form a unit. In this manner, one CB can be saved. On feeders with tee-offs, transformers… Read more
Nov 20, 2017 | By Edvard Csanyi
Commissioning Numerical Protection and Procedure For Carrying Out Performance Tests
Numerical protection is based on a number of microprocessors that can be programmed to reproduce virtually any type of protection and relay. It represents important advantages in reliability, space and… Read more
Oct 30, 2017 | By Edvard Csanyi
Differential protection of transformers, machines, busbars, lines and feeders
Differential protection is very useful method of protection that can be applied to the protection of any network component, such as transformers, machines, busbars, lines and feeders. The differential relay… Read more
Oct 16, 2017 | By Edvard Csanyi
Seven design diagrams that every HV substation engineer MUST understand
A substation engineer should have a good understanding of the electrical equipment and layout of HV power substation. It’s also important to understand relationship between protection and the other equipment… Read more
Oct 04, 2017 | By Edvard Csanyi
Rules for power distribution in LV switchgear and protection of branch / distributed lines
Power distribution in low voltage switchgear can be defined as supplying power to a number of physically separate and individually protected circuits from a single circuit. Depending on the circuits… Read more
Sep 20, 2017 | By Edvard Csanyi
The essentials of electric shock protection, earthing systems and RCDs
Protection of persons and livestock against electric shock is a fundamental principle in the design of electrical installations in accordance with BS 7671: Requirements for Electrical Installations, commonly known as… Read more
Aug 21, 2017 | By Edvard Csanyi