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 | Edvard
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 | Edvard
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 | Edvard
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 | Edvard
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 | Edvard
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 | Edvard
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 | Edvard
Normally residual current devices (RCDs) are used for protection against direct and indirect contacts. An RCD can detect low leakage currents that could flow through the body of a person…. Read more
Aug 16, 2017 | Edvard
When an earth electrode system has been designed and installed, it is usually necessary to measure and confirm the earth resistance between the electrode and “true Earth”. The most commonly… Read more
Aug 09, 2017 | Edvard
A manual transfer switch is installed next to the main service panel to override the normal electrical service with power from a backup generator during a power outage. Manual transfer… Read more
Aug 02, 2017 | Edvard
