IEC and NEMA/IEEE ratings of current transformers (CTs) in medium voltage applications

First, let’s remind ourselves of the basics in a few sentences. That is something you must know. A current transformer (CT) is designed to produce a secondary current which is… Read more

Jan 20, 2020 | Edvard

The art of arc-protection relaying in MV applications

Arc-flash detection relays are superior and provide much faster arc-flash detection times compared to the differential relays. With modern arc-flash detection technology, this detection time is of the order of…...

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Jan 08, 2020 | Edvard

Five switching devices you are likely to spot in most of the low voltage switchgears

This technical article will try to shed some light on switching devices usually installed in low voltage switchgear – circuit breakers, contactors, disconnectors, load-break switches, switch disconnectors and fuses. There… Read more

Dec 23, 2019 | Edvard

The basics of fault protection for medium voltage motors

In principle, the protection of medium voltage motors is similar to low voltage motors, but the requirements are more demanding. Being closer to the utility source, medium-voltage motors are more… Read more

Dec 16, 2019 | Edvard

Backup fault protection for generators in case of a failure at the generation station

It is a common practice to use the differential relay as primary fault protection for the generator. Backup fault protection is also highly recommended to protect the generator from the… Read more

Dec 04, 2019 | Edvard

Four special connections of current transformers in relay protection applications

As you should already know, current transformers are used for metering and relay protection purposes. When we are talking about current transformers used for metering, their performance is of interest… Read more

Dec 02, 2019 | Edvard

HV/EHV substation switching configurations, control and protection functions

The demand for power is growing rapidly due to increased industrial activities almost all across the world. Various generating sets of large ratings are being set up to meet this… Read more

Nov 25, 2019 | Edvard

5 substation building services that usually lack of proper design (and make troubles later)

This technical article introduces five main principles involved with substation control building and switchyard services that make a lot of troubles to substation crew if poorly designed. The article covers… Read more

Nov 20, 2019 | Edvard

Principles and applications of busbar protection schemes (you SHOULD know about)

In olden days, the clearance of busbar faults was done by time delayed distance relays or overcurrent relays, resulting in extension of fault for longer duration of time. In present… Read more

Oct 28, 2019 | Edvard

IED (Intelligent Electronic Device) advanced functions that make our life better

IEDs have been deployed extensively in power automation systems recently, and the shift from RTUs to IEDs is evident due to the integration and interoperability features of the IEDs. This… Read more

Oct 16, 2019 | Edvard