The Concept of Settings Calculation for Modern Protection Andrei Podshivalin, Research Centre BRESLER 30.06.2011, Dublin, Ireland. - презентация

1 The Concept of Settings Calculation for Modern Protection Andrei Podshivalin, Research Centre BRESLER , Dublin, Ireland

2 Requirements to settings D D, X, R,, α, β ? ? New 1. New types of characteristics extension 2. Tripping area extension

3 Need for new techniques not fitsettings do not fit new devices –different set of parameters –different tripping principle dependabilityhigher dependability requirements automated settings calculation

4 Goals of the research Update existing engineering guidelines Develop techniques for new devices AbstractAbstract teaching techniques implicitSetting the «implicit» protection algorithms Informational approach:

5 Given: device –A protection device object –A power network element – object Goal: determine the settings vector M set Example Measurement: Z ac = U ac /I ac Settings vector: M set = [Z set ; φ m.s ] φ m.s Z set line angle jX ac R ac Settings calculation technique 6 Steps

6 Object space definition ConditionsConditions for G α and G β formation –Operation in α-conditions –No operation in β-conditions starting –Influence of starting elements Example δ xfxf RfRf GαGα xfxf RfRf EEe -jδ δ GβGβ xfxf RfRf Step 1

7 Simulation model and modes Basic factors: object –features of the power object conditions –power system conditions basis –informational basis of the protection Example Protected zone Out-of-zone xfxf RfRf EEe -jδ Step 2

8 Setting area determination Application of the education theory –boundary conditions Triangulation method –numerical description of the boundary surface δ xfxf RfRf GαGα GβGβ xfxf RfRf SαSα Example jX ac R ac SβSβ δ Proper area of α-conditions S αα = S α \ S β Step 3

9 Settings vector determination Choose criterion and limiting conditions Apply optimization for V S or V G Example 1 – φ m.s is equal to line angle (traditional approach) 2 – maximum extent for short-circuit faults (R f = 0) 1 2 jX ac R ac Step 4 Criteria:

10 1 2 jX ac R ac Sensitivity analysis Object characteristicsObject characteristics method AnalysisAnalysis of the results RfRf xfxf 1 2 Object characteristics 3 3 Example Step 5

11 Application of the methods Engineering guidelines: Distance protection –polygonal –multi –multi-dimensional Differential protection –restraint for external faults IdId IdId IrIr IrIr Step 6

12 Conclusions EngineeringguidelinesEngineering guidelines have been developed Higher performance of microprocessor protection is reached The general approach leads to better automation The analysis tool is suggested