Energy and Power
What Would Be The Worst Type Of Three Phase Faults (And Why It Happens)
In a three phase power system, the type of faults that can occur are classified by the combination of conductors or buses that are faulted together. In addition, faults may be classified as either bolted faults or faults that occur… Read more
Apr 22, 2016 | By Edvard Csanyi
Power Quality
5 anomalies in AC power that can damage your home devices
In addition to lightning, there are a number of other disturbances that can come in on the AC power lines and damage equipment. Some surge protectors can reduce or eliminate damage from some of these perturbations. There is considerable confusion… Read more
Apr 11, 2016 | By Edvard Csanyi
Protection
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 these situations, the differential protection should not disconnect the system… Read more
Mar 21, 2016 | By Edvard Csanyi
Energy and Power
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 the amount of protection required, these breakers can sense internally… Read more
Feb 27, 2016 | By Edvard Csanyi
Energy and Power
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 Flexible cords Grounded conductors of different systems Grounded conductors of… Read more
Feb 13, 2016 | By Edvard Csanyi
Energy and Power
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 calculate arc flash hazards for the simplest to the most… Read more
Feb 12, 2016 | By Edvard Csanyi
Energy and Power
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 (that is, lack of proper care and attention), Misuse (that is,… Read more
Feb 01, 2016 | By Edvard Csanyi
Energy and Power
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 minimization of voltage differences between exposed metal surfaces on all… Read more
Jan 29, 2016 | By Edvard Csanyi
Metering
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 phase, are connected and the summated current is brought to… Read more
Jan 22, 2016 | By Edvard Csanyi
Energy and Power
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 to be grounded. For situations of this kind a grounding… Read more
Jan 20, 2016 | By Edvard Csanyi
Protection
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, and the math associated with various types of impedance elements…. Read more
Jan 16, 2016 | By Edvard Csanyi
Electric Motor
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 schemes will be presented as a guide for protecting the… Read more
Jan 15, 2016 | By Edvard Csanyi
Low Voltage
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 Maintenance of Molded Case Circuit Breakers Used in Commercial and… Read more
Jan 08, 2016 | By Edvard Csanyi
Cables
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 also eliminate the need to consider equipment modifications and to… Read more
Jan 06, 2016 | By Edvard Csanyi
Energy and Power
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 10 hectares in the Avignon region of France (probability of… Read more
Dec 29, 2015 | By Edvard Csanyi
