3 Main causes of false differential current in transformer
Certain phenomena can cause a substantial differential current to flow, when there is no fault, and these differential currents are generally sufficient to cause a percentage differential relay to trip. However, in… Read more
Mar 21, 2016 | By Edvard Csanyi
The Basics Of Molded Case Circuit Breakers You MUST Know
Molded case circuit breakers are interrupting devices with self-contained, current-responsive elements. These breakers are assembled as an integral unit in a supported and enclosed housing of insulating material. Depending on… Read more
Feb 27, 2016 | By Edvard Csanyi
5 Means Of Identifying Grounded Conductors (By NEC 200 Article)
Latest NEC requirements state at least five means of identifying grounded conductors. So, let’s go through each of them // Sizes 6 AWG or smaller Sizes 4 AWG or larger… Read more
Feb 13, 2016 | By Edvard Csanyi
Arc Flash Hazard Calculation In 9 Steps Using IEEE 1584
The Institute of Electrical and Electronic Engineers (IEEE) published the IEEE 1584 “Guide for Performing Arc Flash Hazard Calculations”. It contains detailed methods and data that can be used to… Read more
Feb 12, 2016 | By Edvard Csanyi
Where do electrical faults occur the most?
A fault is not a natural occurrence. It is an unplanned event which occurs unexpectedly. Electrical faults in an electrical installation or piece of equipment may be caused by: Negligence… Read more
Feb 01, 2016 | By Edvard Csanyi
Important points about grounding of electronic equipment
Grounding electronic equipment for personal safety and clearing of faults is no different than that of any other equipment. Safe grounding requires fast opening of circuit breakers or fuses and… Read more
Jan 29, 2016 | By Edvard Csanyi
Measurement of residual currents on a distribution feeder
The measurement of the earth fault or residual currents on a distribution system feeder can be done by the so-called summation connection, where the three current transformers, one in every… Read more
Jan 22, 2016 | By Edvard Csanyi
When You Ground Ungrounded System With Grounding Transformer
The common grounding assumes a wye-connected neutral to ground. As this is not always the case, and in some cases it is not a three-phase system that it is desired… Read more
Jan 20, 2016 | By Edvard Csanyi
Setting the generator protective relay functions
This technical article will cover the gathering of information needed to calculate protective relay settings, the setting calculations for the various protective functions, typical generator/turbine withstand times for abnormal operating conditions,… Read more
Jan 16, 2016 | By Edvard Csanyi
Protection schemes for generators and motors
It is difficult to define precisely the protection schemes that should be adopted for an electricity distribution system, given the large number of valid alternatives for each situation, but some… Read more
Jan 15, 2016 | By Edvard Csanyi
Guidelines To Inspection Of Molded Case Circuit Breakers (MCCB)
The need for inspection of molded case breakers (MCCB) will vary depending on operating conditions. Suggested inspection and testing is defined in ANSI/NEMA AB 4, Guidelines for Inspection and Preventive… Read more
Jan 08, 2016 | By Edvard Csanyi
8 tips to avoid ground loops when dealing with signal level circuits
General recommendation is to properly design and implement the facility’s grounding system to avoid unwanted involvement of ground loops with the operation of the equipment. This kind of approach can… Read more
Jan 06, 2016 | By Edvard Csanyi
LV Surge Arresters In Action Against Lightning
The site consists of offices (computer hardware, lighting and heating unit), a security post (fire alarm, burglar alarm, access control, video surveillance) and three buildings for the manufacturing process on… Read more
Dec 29, 2015 | By Edvard Csanyi
The Basics Of Circuit Breaker Tripping Units
The main objective of circuit breaker tripping units and protective functions in general is to detect faults and to selectively isolate faulted parts of the system. It must also permit… Read more
Dec 21, 2015 | By Edvard Csanyi
Learn To Interpret Single Line Diagram (SLD)
We usually depict the electrical distribution system by a graphic representation called a single line diagram (SLD). A single line can show all or part of a system. It is… Read more
Dec 19, 2015 | By Edvard Csanyi