Energy and Power
Nine power generating units grouped by prime mover you should know about
Many types of power generating plants are in use and possible for the future, including steam plants fueled by coal, oil, or gas, nuclear plants, hydro plants and plants which… Read more
Aug 18, 2017 | By Edvard
Energy and Power
5 special applications of residual current devices (RCDs)
Normally residual current devices (RCDs) are used for protection against direct and indirect contacts. An RCD can detect low leakage currents that could flow through the body of a person…. Read more
Aug 16, 2017 | By Edvard
Energy and Power
The essentials of MV/HV magnetic voltage transformers
Magnetic voltage transformers are used to provide a secondary signal that is proportional to the actual prevailing primary value. These signals are used to supply measuring instruments, meters, relays and… Read more
Aug 14, 2017 | By Edvard
Energy and Power
10 equipment you MUST recognize in every distribution substation
Distribution substation is a substation from which electric supply is distributed to the different users. In a substation there are numbers of incoming and outgoing circuits each having its isolator,… Read more
Aug 11, 2017 | By Edvard
Energy and Power
The most common methods of measuring the resistance of an earth electrode
When an earth electrode system has been designed and installed, it is usually necessary to measure and confirm the earth resistance between the electrode and “true Earth”. The most commonly… Read more
Aug 09, 2017 | By Edvard
Energy and Power
Practical advice for positioning of circuit breakers inside LV switchboard
Mounting of the different mechanical and electrical components (enclosures, busbars, functional units – circuit breakers, etc.) which constitute the LV switchboard defined by the original manufacturer must be carried out… Read more
Aug 07, 2017 | By Edvard
Energy and Power
MV network diagrams for feeding secondary switchboards and MV/LV transformers
Let’s take a look at the main MV network diagrams and structures used to feed secondary switchboards and MV/LV transformers. The complexity of the diagrams differs, depending on the level… Read more
Aug 04, 2017 | By Edvard
Energy and Power
How to install a manual transfer switch for a backup system in 16 steps
A manual transfer switch is installed next to the main service panel to override the normal electrical service with power from a backup generator during a power outage. Manual transfer… Read more
Aug 02, 2017 | By Edvard
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…...
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Jul 31, 2017 | By Edvard
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
