ArcModelBlockset

2 x(1) u(2 ) dx (1) e u(1) - -----------------------------------= ---------- – 1 tau dt P
(2) gu 2 d ln g = u --------------------------- – 1 τ P dt i = gu
The creation of the Arc Model Blockset is performed at the Electrical Power Systems group of the Delft University of Technology within the framework of an international consortium with the aim to realize ‘digital testing of high-voltage circuit breakers’. This consortium has as partners: KEMA High-Power Laboratory (NL), Delft University of Technology (NL), Siemens AG (G), RWE Energie (G) and Laborelec cv (B). The project is sponsored by Directorate General XII of the European Commission in the Standards, Measurements and Testing programme under contract no. SMT4-CT96-2121.
The measurement block and the controlled source act as links between electrical signals (voltages across elemenand Simulink blocks (transfer functions) and vice versa respectively. Hereunder, the function of various components in the Mayr arc model will be clarified. DEE (Differential Equation Editor) The equations of the Mayr arc model have been incorporated by means of the Simulink DEE (Differential Equation Editor) block, as shown hereunder.
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Arc Model Blockset Chapter 2 Usage of the Arc Model Blockset
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u(1) is the first input of the DEE block and equals the arc voltage: u. u(2) is the second input of the DEE block and represents the contact separation of the circuit breaker: u(2) = 0 when the contacts are closed and u(2) = 1 when the contacts are being opened. x0 is the initial value of the state variable, i.e. the initial value of the arc conductance:g(0). x(1) is the state variable of the differential equation which is the natural logarithm of the arc conductance: ln(g). y is the output of the DEE block and equals the arc current: i. Therefore, the following system of equations is solved:
© 2001, Delft University of Technology P.H. Schavemaker P.H.Schavemaker@its.tudelft.nl Electrical Power Systems (eps.et.tudelft.nl) Fac. Information Technology and Systems (www.its.tudelft.nl) Delft University of Technology (www.tudelft.nl) The Netherlands
Arc Model Blockset
for use with MATLAB Simulink and Power System Blockset
User’s Guide
Version 2
Delft University of Technology
We make no warranties, explicit or implicit, that the Arc Model Blockset is free of error. For remarks and suggestions concerning this program, please contact: P.H.Schavemaker@its.tudelft.nl
Place the files: • arc_model.mdl • slblocks.m • arc_demo.mdl in a directory on your harddisk. Add this directory to your MATLAB-path in order to have the Arc Model Blockset included in your Simulink library browser:
If the directory has been added to the MATLAB path, the Arc Model Blockset can be opened by typing arc_model at the MATLAB prompt too:
If the directory has been added to the MATLAB path, a demonstration can be run by typing arc_demo at the MATLAB prompt.
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Arc Model Blockset Table of Contents
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Arc Model Blockset
Chapter 1 Introduction
The Arc Model Blockset is a MATLAB Simulink/Power System Blockset extension and can be used to make arc-circuit interaction studies during the interruption process of high-voltage circuit breakers.
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Chapter 3 - List of arc models
Cassie arc model ...................................................................11 Habedank arc model .............................................................11 KEMA arc model..................................................................13 Mayr arc model.....................................................................14 Modified Mayr arc model .....................................................15 Schavemaker arc model ........................................................16 Schwarz arc model................................................................17
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Chapter 2 Usage of the Arc Model Blockset
2.1 Installation
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Arc Model Blockset Chapter 2 Usage of the Arc Model Blockset
2.2 Implementation
The arc models have been modelled as voltage controlled current sources. When looking under the mask of the Mayr arc model, this approach becomes clear: