Energy and Power
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Reactive power and power factor measurement in industrial plant
A varmeter is used to measure the reactive power in an industrial plant that is supplied by an 8300-V, three-phase, four-wire line. The plant load is estimated to be 300 kVA at 0.8 pf. Design a suitable measuring system. The…...
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Jul 31, 2017 | By Edvard Csanyi
Energy and Power
20 Simple Questions to Check Your Overcurrent Protection Knowledge
As you already know, reliable overcurrent protective devices, such as fuses and circuit breakers, prevent or minimize costly damage to transformers, conductors, motors, equipment, and the other many components and loads that make up a complete electrical system. As an… Read more
Jul 31, 2017 | By Edvard Csanyi
Energy and Power
Unbalance protection of grounded & ungrounded wye shunt capacitor banks
The protection of shunt capacitor banks against internal faults involves several protective devices in a coordinated scheme. Typically, the protective elements found in a shunt capacitor banks (SCB) for internal faults are: individual fuses (not discussed here), unbalance protection to… Read more
Jul 26, 2017 | By Edvard Csanyi
Energy and Power
Three proven ways to reduce electrical energy losses in buildings
As savings in terms of costs are the main concern for the operators, the first approach is to try to reduce electrical energy losses in buildings. Also, the electricity supply network itself consumes energy. Moreover, if it is not suitably… Read more
Jul 24, 2017 | By Edvard Csanyi
Energy and Power
What does bonding (bonded) mean and what does NEC article 250 say about it?
The National Electrical Code (NEC) covers grounding and bonding in several articles, but the primary coverage is in Article 250. Typical commercial electrical systems are grounded systems. Within the system, some things are grounded… some things are bonded. The terms… Read more
Jul 21, 2017 | By Edvard Csanyi
Electrical Lectures
11-step procedure for a successful electrical circuit design (LV project example)
Let’s take an example of electrical circuit design. A consumer lives in a bungalow with a detached garage and workshop, as shown in Figure 1. The building method is traditional brick and timber. The mains intake position is at high… Read more
Jul 19, 2017 | By Edvard Csanyi
Energy and Power
Practical solutions for preventing ferroresonance in electrical installations
Ferroresonance is a non-linear resonance phenomenon that can affect power networks. The abnormal rates of harmonics and transient or steady state overvoltages and overcurrents that it causes are often dangerous for electrical equipment. Some unexplained breakdowns can be ascribed to… Read more
Jul 17, 2017 | By Edvard Csanyi
Energy and Power
How choice of system earthing affects low voltage switchgear?
Choice of system earthing affects not only dependability (in the largest sense) but also installation, in particular with respect to the low voltage switchgear to be implemented. The three system earthings internationally used and standardized by IEC 60364 have as… Read more
Jul 05, 2017 | By Edvard Csanyi
Energy and Power
Power quality monitoring with line disturbance analyzers and voltage recorders
Many power quality problems are caused by inadequate wiring or improper grounding. These problems can be detected by simple examination of the wiring and grounding systems. Another large population of power quality problems can be solved by spot-checks of voltage,… Read more
Jul 03, 2017 | By Edvard Csanyi
Energy and Power
System earthings and incidents on MV side that result in LV disturbances
Low voltage networks, unless a replacement uninterruptible power supply (with galvanic insulation) or a LV/LV transformer is used, are influenced by MV. This influence takes the form of: capacitive coupling, galvanic coupling and common impedance. And the reasons for influences are: Capacitive… Read more
Jun 30, 2017 | By Edvard Csanyi
Energy and Power
2 types of synchronisers required on a power system with two supplies
Synchronisers are required at points on a power system where two supplies (either generator and grid, or two grid supplies) may need to be paralleled. They are more than just a measuring device, as they will provide contact closures to… Read more
Jun 26, 2017 | By Edvard Csanyi
Energy and Power
Practice for good grounding and bonding a home wiring system
All home electrical systems must be bonded and grounded according to code standards. This entails two tasks: First, the metal water and gas pipes must be connected electrically to create a continuous low resistance path back to the main electrical… Read more
Jun 19, 2017 | By Edvard Csanyi
Energy and Power
Lock-out tag-out practice and seven other steps that save lives
Lock-Out / Tag-Out (LOTO) refers to the specific practices and guidelines to safeguard employees from the unexpected start-up, movement, activation, energizing, release of energy, etc of machinery, equipment, plant, systems during service, maintenance or inspection activities. In short: To protect… Read more
Jun 16, 2017 | By Edvard Csanyi
Energy and Power
Did you test your electrician’s skills recently? Take the quiz. It’s time!
It’s always a good idea to put the sparks into your memory and shed light on things you have learned years ago. Whether you are a rookie in a field of electrical engineering or a professional electrical engineer or electrician,… Read more
Jun 07, 2017 | By Edvard Csanyi
Energy and Power
Three earthing fault typologies and connection of the CB poles in a DC network
In order to break a short-circuit current in a d.c. system, it is necessary to connect the circuit breaker (CB) poles in a suitable way. To carry out this operation, it’s necessary to know the earthing typology of the plant…. Read more
Jun 05, 2017 | By Edvard Csanyi
