Workshop description

Lecture: Numerical Simulations

The numerical methods of solving of complex engineering problems are being developed extensively and used more and more in industrial world. The main benefits are reduced costs and time of designing and optimization processes. In ABB modern CAE (Computer Aided Engineering) tools (in-house and commercial) are utilized for modeling of physical and chemical phenomena on the following areas:

During the lecture selected methods (tools) will be presented as well as exemplary results of simulations.

Lecture: Transients in power systems

Background:

Electrical power networks are subjected to various forms of electrical transients. The transients can be classified in various ways depending on their origin, amplitude, or frequency spectrum. They can often disturb the operation of electrical equipment or, in extreme cases, can cause the equipment damage due to the damage of the insulation system. Therefore understanding of the phenomena is necessary in order to apply appropriate mitigation strategy.

Scope:

Lab exercises: Ferroresonance in ungrounded MV network

Practical demonstration of ferroresonance in MV voltage transformers in a laboratory environment.: scaled-down (low-voltage) experimental set-up enabling investigation of ferroresonat conditions and ferroresonance damping.

Scope:

Lab exercises: Diagnostics

During the exercises thermal camera will be used. Condition monitoring on:

Hands od experience:

Laptops with Matlab will be given to groups of two students. Afterwards, condition monitoring data will be provided. Based on the acquired knowledge, a diagnostic to the machine shall be given by the students.

Lecture: System Protection

Substation automation systems (SAS) play major role in operation of transmission and distribution network. While the primary HV/MV equipment is responsible for power delivery, substation automation devices - known as secondary circuits - are there to provide critical functions like fault detection and identification, system protection, disturbance recording and inter-communication. Typically these functions are implemented in so called protection relays that nowadays are made as programmable digital computers integrating many protection functions into one box. The main task of those protection functions are to immediately identify abnormal and unsafe condition of power system and to initiate actions to prevent hazard to people, damage to power network devices and breakdown of the power network.

Today, protection relays handle and process variety of available information, using adaptive multicriteria schemes and utilizing new signal processing methods such as artificial intelligence, genetic and fuzzy methods. Additionally new approach based on synchrophasor measurements is exploited in wide area protection to create dynamic view of power systems.

Prepared lecture and exercise in a practical manner illustrate the role of the power system protection, define the main protection principle/application and substation automation system communication aspects.

Lab exercises: System Protection