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

Occurrence and detection of an earth fault in MV power systems with isolated neutral

The mode of operation of an MV industrial power system that is galvanically isolated from the public power supply is determined by the method of neutral earthing on the secondary… Read more

Oct 14, 2019 | Edvard

Medium voltage switches for isolation and earthing (applications & IEC 62271 ratings)

Medium voltage switches for use on 1-52kV indoor systems are predominantly used for isolation and earthing. Although the majority of these switches are air insulated, gas insulated (SF6) combination switches… Read more

Oct 09, 2019 | Edvard

The art of achieving selectivity between incoming feeders connected in parallel

Calculating selectivity between incoming low voltage feeders connected in parallel is never an easy task. In parallel operation of two, three and more transformers on a common busbar, the partial… Read more

Oct 07, 2019 | Edvard

Good practice rules for electromagnetic compatibility (EMC) of LV conductors

The search for an overall optimization of the installation with regard to electromagnetic compatibility (EMC) and its ability to function without suffering or emitting excessive interference, comes via a set… Read more

Sep 30, 2019 | Edvard

Operating centralized automatic compensation systems when supplying linear loads

For energy-efficient operation of decentralized multiply-fed industrial networks, each load-centre substation must have its own centralized reactive-power compensation system for automatic PF correction. The automatic reactive-power compensation systems used for… Read more

Sep 16, 2019 | Edvard

Interference and noise affecting transmission media in protection signalling

The transmission media that provide the communication links involved in relay protection signalling are private pilots, rented pilots or channels, power line carrier, radio and the newest and the most… Read more

Sep 09, 2019 | Edvard

The facts about modern rotary and static uninterruptible power systems (UPS)

This technical article covers the brief explanation of the power quality issues with the reference to the past as well as two main types of modern UPS systems – rotary… Read more

Sep 04, 2019 | Edvard

Case study: Failure of a transformer & switchgear buses due to a ferroresonance event

First of all, it’s good to know that the possibility of a transformer ferroresonance condition rapidly increases as the transformer is closer to generator zone. This condition may occur when…...

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Aug 23, 2019 | Edvard

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