Instructor <a href="instructor-velimir">Velimir</a> in Ingenieria Electrica
Items 1-10 of 20
- 6T - AC Motor Protection$90.00Learn More
There is a wide range of AC motors since they can be used in numerous applications. AC motors need to be protected but protection selection usually does not depend on the motor and load type. This selection is based on the fundamental AC motor operation processes. There are crucial differences between the protection of induction motors and synchronous motors. Motor operation characteristics have to be particularly considered when applying selected protection. This approach is more important for the motors than for any other power system element.
For example, the starting and stalling currents/times have to be known and taken into account when using overload protection. Also the thermal withstand of the AC motor has to be precisely defined under balanced and unbalanced loading conditions. The conditions for which AC motor protection is needed can be separated into two main groups: imposed external conditions and internal short circuits.
This course is suitable for electrical engineers with a desire to understand the fundamentals of AC motor protection. Presented details cover issues related to protection against external and internal motor faults. Upon successful completion engineers will be able to address AC motor protection terminology and concepts and techniques that are used for overload, single phasing, under-voltages, unbalanced supply and reverse phase sequence faults.
- 4T-Grounding System Theory and Practice$60.00Learn More
Grounding System Theory and Practice provides an introduction to grounding system design. Underground-fault conditions, the flow of current will result in voltage gradients within and around the substation, not only between structures and nearby earth, but also along the ground surface. In a properly designed system, this gradient should not exceed the limits that can be tolerated by the human body.
The purpose of a ground mat study is to provide for the safety and well-being of anyone that can be exposed to the potential differences that can exist in a station during a severe fault. The general requirements for industrial power system grounding are similar to those of utility systems under similar service conditions. The differences arise from the specific requirements of the manufacturing or process operations.
This course is suitable for electrical engineers with a desire to understand the fundamentals of grounding practices and safety issues related to grounding design. Upon successful completion, engineers will be able to address various grounding problems, understand how grounding systems are modelled and how step and touch voltages are calculated.
- 3T-Unit Protection of Feeders$50.00Learn More
The graded overcurrent protection design, though quite simple, do not meet all the protection demands of an electrical power system. Application issues are experienced for two reasons: firstly, acceptable grading cannot be accomplished for a complex electrical system, and secondly, the protection adjustments may lead to maximum operating times that are excessive and cannot stop faults.
These issues are directed to the unit protection concept. This concept means that parts of the electrical system are separately protected without reference to other parts of the electrical system. One unit protection concept is widely known as ‘Differential Protection’. Foundation of this principle is to detect the difference in currents between the incoming and outgoing terminals of the protected element. Other unit protection concepts can be based on directional comparison, distance tele-protection arrangements or phase comparison unit protection.
This course is suitable for electrical engineers with a desire to understand the fundamentals of feeder unit protection. Presented details cover basic unit protection concepts and their particular applications to high voltage feeders. Upon successful completion engineers will be able to address basic feeder unit protection terminology, concepts, applications and arrangements.
- 3T-Industrial System Protection$50.00Learn More
Development of industrial and commercial electrical power systems has also introduced the requirements for their improved reliability. The possible outage time costs have also dramatically increased. The introduction of automation systems into industry and commerce requires application of advanced power system automation in order to enhance overall reliability and efficiency. Careful attention has to be given to the protection and control of industrial electrical supply systems.
Many technologies that have been developed for EHV electrical systems may be used in lower voltage systems but usually on a reduced scale. Nevertheless, industrial electrical systems have many particular issues that need special attention and the development of custom solutions.
This course is suitable for electrical engineers with a desire to understand protection fundamentals that are applicable to industrial systems. Presented details cover protection of different equipment such as motors, feeders and transformers. Description of MCBs, MCCBs, fuses, different circuit breaker technologies and relays is also provided. Upon successful completion engineers will be able to address industrial system protection basics is terms of available protection technologies, methods, protection arrangements and their application to typical design configurations.
- 3T - Arc Flash Basics and Hazard Planning Program$50.00Learn More
This course gives an overview of arc flash hazards and concisely reports the different causes, nature, findings, directions and processes related with arc flash hazards. In order to address the hazard, it is first required to formulate an understanding of the process.
- 3T - Principles of HVDC Transmission$50.00Learn More
The question that is frequently discussed is: “Why does anyone want to use D.C. transmission?” One reply is that electric losses are lower, but this is not true. Amount of losses is determined by the rating and size of chosen conductors. Both D.C. and A.C. conductors, either as transmission circuits or submarine cables can generate lower power losses but at increased cost since the bigger cross-sectional conductors will typically lead to lower power losses but will unfortunately cost more.
Contact Hours: 3 Hours - Technical
- 3T - Gas Insulated Substation Definitions and Basics$50.00Learn More
When determining between AIS or GIS technology, some elements alone, for example aesthetics, may be an overcoming impact on a user’s conclusion. Nevertheless, most of the time the best conclusion asks for assessing many elements and soliciting input data from many sections within an investor’s organization. It is also critical to note that the optimal substation arrangement may not be solely AIS or GIS. Sometimes a mix of the two (i.e., hybrid or mixed-technology) might be the best arrangement. Typically, most of the factors will prefer GIS technology, but it is the value or importance given to the considerations that decides if the return on investment is justifiable to choose GIS over AIS technology. Consideration that can be measured should be assigned importance weights based on the user’s needs.
Contact Hours: 3 Hours - Technical
- 2T - Power System Transient Stability Study Fundamentals$30.00Learn More
The ability of a power system, containing two or more synchronous machines, to continue to operate after a change occurs on the system is a measure of its stability. The stability problem takes two forms: steady-state and transient.
Contact Hours: 2 Hours - Technical
- 3T - Distance Protection$50.00Learn More
Since the impedance of a transmission circuit is relative to its length, for distance measure it is suitable to use a relay able to measure the impedance of a circuit up to a present point (the reach point). Such a protection relay is known as a distance protection relay and is made to function only for faults happening between the protection relay location and the chosen reach point, therefore providing discrimination for short circuits that may happen in different line portions.
Contact Hours: 3 Hours - Technical
- 4T - Introduction to Short Circuit Current Calculations$60.00Learn More
This course presents the subject of short-circuit studies in a very structured fashion. First, a simple equivalent circuit is developed for a generic power system, system impedances are recalculated to common base and fault are calculated at various locations throughout the system. A detailed explanation is offered for calculation of three phase faults. Explained techniques can be also verified by any commercial power system software package.
Contact Hours: 4 Hours - Technical