Category Archive for: «Energy and Power»

Page 1 of 4312345»102030 Last »

Single versus Parallel Generators – 7 Factors To Consider

7 factors to consider when deciding // Paralleling is the synchronous operation of two or more generator sets connected together on a common bus in order to provide power to common loads as shown in Figure 1. In deciding whether a single or multiple generators should be installed there are various factors to be considered, such as: Reliability […]

Read More

Calculating The Short-Circuit Heating Of Busbars

Short-Circuit Effects Like all electrical circuits, busbars need to be protected against the effects of short-circuit currents. The open construction of busbars increases the risk of faults, e.g. by the ingress of foreign bodies into air gaps, and the risk of consequent damage is high due to their high normal operating currents and the amount […]

Read More

Cable Sizing of Sub-Main Circuits – Working Examples

Few words about Sub-main circuits… A sub-main circuit can be defined as a circuit connected directly from the main LV switchboard to a sub-main distribution panel or a rising main for final connection of the minor current-using equipment. The Code requires that the maximum copper loss in every sub-main circuit should not exceed 1.5% of the total active power […]

Read More

5 Types of equipment which generates the most harmonics

Non-linear loads // Harmonic load currents are generated by all non-linear loads. This includes: Switched mode power supplies (SMPS) Electronic fluorescent lighting ballasts Variable speed drives (VSDs) Uninterruptible power supplies (UPS) Magnetic-cored devices 1. Switched mode power supplies (SMPS) The majority of modern electronic units use switched mode power supplies (SMPS). These differ from older […]

Read More

4 Power Transformer Protection Devices – Explained In Details

Oil Transformer protection The power transformer protection is realized with two different kinds of devices, namely the devices that are measuring the electrical quantities affecting the transformer through instrument transformers and the devices that are indicating the status of the physical quantities at the transformer itself. An example of the former could be current-based differential […]

Read More

Detailed Overview of Power System Disturbances (Causes and Impacts)

Power Quality problems To make the study of Power Quality problems useful, the various types of disturbances need to be classified by magnitude and duration. This is especially important for manufacturers and users of equipment that may be at risk. Manufacturers need to know what is expected of their equipment, and users, through monitoring, can determine if an equipment […]

Read More

Back To School – Let’s Calculate Current I3

Techniques for solving DC circuits Referring to the following circuit, calculate direct current I3: Using Kirchhoff’s laws; Using nodal analysis; Applying Thévenin’s theorem at nodes A and B. Ok, let’s dive into calculation… – KCL stands for Kirchhoff’s Current Law – KVL stands for Kirchhoff’s Voltage Law The following equation can be written: Substituting values, […]

Read More

Good Voltage Regulation and Justified Power Factor Correction

Commercial Building Case Power factor correction and voltage regulation are closely related. In many cases, the desired voltage regulation is costly to obtain. Larger or paralleled conductors to reduce voltage drop under load are, in many cases, the proper solution. However, power factor correction may also be justified for four reasons: To improve voltage To […]

Read More

6 Energy-Efficiency Improvement Opportunities In Fan Systems

Energy Saving Potential Efficiencies of fan systems vary considerably across impeller types. The average energy saving potential in these systems in the U.S. manufacturing industry is estimated at 6%. For optimal savings and performance, it is recommended that a systems approach is used. In the following, energy saving opportunities for fan systems are presented. Minimizing […]

Read More

Many engineers advocate the use of multiple-transfer switches

Why multiple-transfer switches Automatic transfer switches are primarily used for emergency and standby power generation systems. These transfer switches may incorporate overcurrent protection and are designed and applied in accordance with the NEC, Articles 230, 517, 700, 701,702 and 710, and other applicable standards. To comply with codes and standard requirements for reliability, automatic transfer […]

Read More
Page 1 of 4312345»102030 Last »


CONNECT //
Electrical Engineering Daily Dose
Daily dose of knowledge and news from
Electrical Engineering World

Support our work //

Feel free to donate and support our work and contribution to the #EE society.