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Electromagnetic transient analysis

We have extensive expertise in the modelling of power system transients using electromagnetic transient programs. Our experience covers the entire range of transient events from low frequency sub-synchronous turbine generator torsional vibrations (<50Hz) mid frequency switching transients (50Hz to 20kHz), and high frequency, fast front studies (up to 1MHz).

We have an in-depth understanding of common and not-so-common electrical system transient issues on industrial systems as well as utility transmission and distribution systems.

For studies, we often use the most advanced electromagnetic transients program, PSCAD/EMTDC. We understand common and not-so-common electrical system transient issues on industrial systems and also on utility transmission and distribution systems. Our applied transient modelling techniques enable us to understand and determine appropriate mitigation for non-standard power system problems.

Mott MacDonald has used transient studies to identify potential issues on new build systems and has successfully explained and devised appropriate mitigation for transient problems experienced on operational systems.

We focus on issues of concern immediately and model the system in appropriate detail, avoiding the common mistake of including too much elemental information when not required. We achieve the required detail in results without affecting accuracy. These factors enable work to be carried out quickly and cost effectively – important benefits in a technological area where analysis can be expensive and time consuming.

Cooperation with the developers of the PSCAD/EMTDC program has led to the development of new models and features in the program based on requirements identified during our system studies.

Sector

Our extensive expertise includes:

  • Assessment of electrical and mechanical system interactions in variable speed drives and turbine generators
  • Assessment of fault current limiter operation
  • Circuit breaker transient recovery voltage calculations
  • Development of turbine generator controllers
  • Insulation co-ordination and assessment of rating
  • Overhead transmission line and cable transients
  • Placement of surge arresters
  • Transformer inrush and capacitor and filter bank switching transients
  • Unique pulse power applications

Services

While systems modelling are reliant on quality software, it is even more reliant on quality analysts who understand the phenomena being modelled.

 

Our experts have experience of most system types and with interpreting model results. This means we can provide solutions to problems during the design stage, the most cost effective time to implement changes, or on existing systems where operational difficulties are traced to issues that need to be modelled to understand and alleviate them.

 

Mott MacDonald has used PSCAD/EMTDC to model system harmonics and inter-harmonics in the time domain – where standard frequency domain techniques may not be suitable – by modelling converters at switching device level. We can import data from standard load flow programs directly into time domain models using the ETRAN translation program. This allows detailed and harmonic impedance calculations to be performed using frequency dependent overhead line and cable models.

Customer benefits

This is a specialist service provided by a few consultants.

Savings/value added demonstrated

Our applied transient modelling techniques enable us to understand and determine appropriate mitigation for non-standard power system problems.

Selected project examples

In each case we utilised analysis and modelling tools to advise on appropriate mitigation that was successfully applied in practice.

  • Solution to a long-standing protection problem on a 275kV transmission system
  • Identification of system over-voltages caused by transformer inrush exciting a low frequency power system resonance
  • Explanation for incorrect operation of fault current limiters in an industrial distribution system
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