Protection scheme for the substation with a single supply from the utility

The utility supply voltage depends on both availability and consumer requirements. The consumer transformer is connected delta on the high-voltage side and grounded wye on the low-voltage side. A fused-disconnect… Read more

Jan 07, 2019 | Edvard

Analysis of faults in machine and transformer windings

The analysis of faults in synchronous machine and transformer windings presents a special difficulty because the effective impedances of the affected windings under internal fault conditions are not normally known…. Read more

Jan 02, 2019 | Edvard

Directional protection relays applied to multiple power sources, parallel circuits and loops

Directional protection is usually applied to distribution systems that contain multiple power sources, parallel circuits and rings/loops. For such systems it is absolutely necessary to have protection against fault currents…...

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Dec 27, 2018 | Edvard

15 bad situations that may lead to catastrophic explosion of a capacitor bank

Some of the failure problems associated with capacitor banks are already known, since they happen often. A few of the failures are traceable to the original source and sometimes that… Read more

Dec 23, 2018 | Edvard

The Essentials Of Voltage Transformers (Advanced Theory and Practice)

The most common voltage sources for power system measurements and protections are either wound transformers (voltage transformers) or capacitive divider devices (capacitor voltage transformers or bushing potential devices). Some new… Read more

Dec 19, 2018 | Edvard

The essence of LV circuit breakers – Releases, tripping curves, characteristics and limitation

A circuit breaker is both a circuit-breaking device that can make, withstand and break currents whose intensity is at most equal to its rated current (In), and a protection device… Read more

Dec 17, 2018 | Edvard

Protection scheme for remote private substation with small generator

Connections of private substations to utilities are made more complicated with the addition of private-owned generation facilities. The choice of relays and their placement must be made to ensure adequate… Read more

Dec 12, 2018 | Edvard

Protection Of The Power System Heart – The Generator

This technical article gives key points about the generator protection. To recover the generator from various kinds of faults, the generator protection scheme of the plant must be designed in such… Read more

Dec 05, 2018 | Edvard

Connection schematics of voltage transformers for protective applications

Voltage transformers would have primaries that are either connected directly to the power system (VTs) or across a section of a capacitor string connected between phase and ground (coupling capacitor… Read more

Nov 28, 2018 | Edvard

10 unbalance detection schemes for removing failed capacitor bank from the system

The main purpose of an unbalance detection scheme is to remove a capacitor bank from the system in the event of a failure and fuse operation. This will prevent damaging… Read more

Nov 26, 2018 | Edvard

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