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… Read more
Jul 31, 2017 | By Edvard
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… Read more
Jul 26, 2017 | By Edvard
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… Read more
Jul 24, 2017 | By Edvard
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,… Read more
Jul 21, 2017 | By Edvard
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… Read more
Jul 19, 2017 | By Edvard
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… Read more
Jul 17, 2017 | By Edvard
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… Read more
Jul 05, 2017 | By Edvard
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… Read more
Jul 03, 2017 | By Edvard
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… Read more
Jun 30, 2017 | By Edvard
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… Read more
Jun 26, 2017 | By Edvard
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… Read more
Jun 19, 2017 | By Edvard
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… Read more
Jun 16, 2017 | By Edvard
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… Read more
Jun 07, 2017 | By Edvard
Energy and Power
3 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,… Read more
Jun 05, 2017 | By Edvard
Energy and Power
12 installation tips for implementing a good residual protection
All installations have an earth leakage current that is mainly due to the conductor’s capacitive leakage and to anti-parasitic or EMI filtering capacitors, for example class I equipment. The sum… Read more
Jun 02, 2017 | By Edvard
