CYME Presentation [PDF]

Zitiervorschau

WELCOME A SESSION ON CYME By N.K.SHYAMSUNDER

CYME z z z

PSAF – Power system analysis framework CYMTCC – CYME time current co-ord. CYMVIEW – Graphical Plot program

CYME - PSAF z z z z z z

PSAF-FAULT:FAULT SYSTEM ANALYSIS PSAF-FLOW:LOAD FLOW ANALYSIS PSAF-MOTORSTART:MOTOR STARTING STUDY PSAF-STAB:TRANSIENT STABILITY ANALYSIS PSAF-HARMO:HARMONIC ANALYSIS (NOT AVAILABLE) PSAF-CYMTCC INTERFACE, Protective devices

Inputs for PSAF z z

Final single line diagram Fix the bus nodes – – – – –

z

Generator Details Transformer Details Induction load Constant load Largest motor to be started

Type of Faults – Decide in consultation with client

CYME – CREATE ONE LINE DIAGRAMILLUSTRATION z z z z z z z z z z

CLICK NEW STUDY – FILE OPTION DIALOG BOX- LOADING NETWORK DATA- a) USE TABULAR FORMAT b) SHOW ONE LINE DIAGRAM SELECT ONE LINE DIAGRAM NEW STUDY DIALOG BOX – CLICK ON CREATING A NEW NETWORK SELECT DEFAULT BUS 1 IN THE DIALOG BOX SELECT THE CORNER TO ROTATE THE SLD DOUBLE CLICK ON THE LINE TO ENTER THE VOLTAGE PARAMETERS SELECT THE END OF THE BUS AND DRAG TO STRETCH THE BUS TO MOVE THE BUS LEFT CLICK HOLD THE BUS AND MOVE TO NEW LOCATION. CREATE AS MANY BUSES AS REQUIRED TO CONNECT THE EQUIPMENTS

CYME – CREATE ONE LINE DIAGRAMILLUSTRATION -GENERATOR z z z z

z z z

SELECT GENERATOR ICON ON THE NETWORK EQUIPMENT SELECTION TOOLBOX DOUBLE CLICK ON THE ICON TO ACCESS THE DATABASE DIALOGBOX TWO TABS PRESENT TAB-1 : ENTER DETAILS OF NAME PLATE DATA, MVAR LIMITS,WINDING CONNECTION,POWER FACTOR, GROUNDING IMPEDANCE – DATAS REQUIRED FOR LOAD FLOW, SHORT CIRCUIT, MOTOR STARTING,HARMONIC ANALYSIS. TAB-2 : DETAILS REQUIRED IF STABILITY ANALYSIS HAS TO BE PERFORMED. TRANSIENT, SUBTRANSIENT REACTANCES AS AVAILABLE SHALL BE PROVIDE DEPENDING ON THE TYPE OF GENERATOR USED H - INERTIA CONSTANT EXPRESSED IN SECONDS - REQUIRED FOR STABILITY ANALYSIS – TYPICALLY 1 ≤ H ≤ 9.

CYME – CREATE ONE LINE DIAGRAMILLUSTRATION-LOAD FLOW z z z z z z z z

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TWO DIALOG BOX – STUDY AND SOLVE – ICONS IN THE GUI OPEN TRBASECASE .STU STUDY FILE FROM FILE MENU SELCT POWER FLOW ANALYSIS FROM DROP DOWN BOX CLICK STUDY ICON ENTER THE STUDY NAME AND DESCRIPTION OF THE STUDY IN THE TITLE ENSURE THE DATABASE FILE IS IN LINKED TO THE SAME DIRCTORY CLICK ON LOAD FLOW PARAMETER TAB AND ENTER DETAILS ACCORDINGLY IN THE REPORT TAB OPTIONS SELECT THE REPORT OPTIONS LIKE VOLTAGE (p.u, v, kV), CURRENT ( pu, amp, ka), POWER (p.u, kVA, mVA), POWER FACTOR (pu, %), AMPACITY (amp, kVA, mVA) REPORTS CAN BE EXPORTED TO EXCEL AND FORMATED.

Power Flow Analysis z

z z z z z

Load flow study determines how the electrical system will perform during normal and emergency operating conditions, providing the information needed to: Optimize circuit usage Develop practical voltage profiles Minimize kW and kVar losses Develop equipment specification guidelines Identify transformer tap settings

POWER FLOW ANALYSIS z z z

Gauss Seidel Newton Raphson Fast Decoupled

SHORT CIRCUIT STUDY z

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The short-circuit study calculates the shortcircuit capacity at designated locations within the power delivery infrastructure. This data may also be utilized to select equipment ratings and may serve as the basis for protective device coordination study.

FAULT LEVEL z z z

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Planning the future configuration of the power system. Safeguarding the Equipment Introducing new Equipment to restrict the fault current at critical locations in the network. Used with Protective device co-ordination

FAULT SYSTEM ANALYSIS - CYME z z

In the short circuit dialog box in Generator Impedances always select subtransient Fault report can be generated as below – – – – –

Summary on all buses Detailed on all buses Detailed on selected bus Global report on selected bus Sliding fault along a line

FAULT SYSTEM ANALYSIS - CYME

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IEC AND ANSI a) LLL FAULT- Required at all situations b) LG FAULT – Earth fault coordination

IEC a) b) c) d)

Initial Symmetrical fault Peak current Breaking current at different time intervals Steady state current – Relay co-ordinaton

MOTOR STARTING STUDY z z z z z z z

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Voltage profile at various points The following parameters are to be provided Name plate data of motor Equivalent circuit parameters : R & X of rotor and stator Induction motor Mechanical load data : a) moment of inertia of the rotating parts b) Slip – torque characteristics Results can be plotted in CYMVIEW Different options of the report like Time vs Voltage, Current, Power Factor, Torque can be generated. Run load flow prior to motor start

MOTOR STARTING STUDY z

Voltage profile at various points

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Run load flow prior to motor start

Transient Stability z z z a) b)

Planning the future configuration of the power system. Adding large individual items of Dynamic equipment eg. Large Ind. Motor or gen. Modifying the main interconnections within the system Critical switching time of CB’s Starting V.D & run up performance of large motors

TRANSIENT STABILITY ANALYSIS System disturbances due to z Fault at buses z Starting of largest motor z Stopping of motor etc. z

Run load flow prior to transient stability.

EDSA & CYME

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EDSA EXCEPT TRANSIENT STABILITY ANALYSIS ALL OTHER PACKAGES IN CYME ARE AVAILABLE IN EDSA.

Protective Device Coordination z z

Making modifications in the system like replacing outdated equipment To identify local problem areas for the selection of suitable devices eg. Relays, fuses, C.B’s etc.

CYMTCC z

Checks the coordination of the system and enables in fixing the setting points in relay

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RUN SHORT CIRCUIT STUDY PRIOR TO COORDINATION

RELAY CO-ORDINATION

FORMULA USED z z

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Moment of inertia = 0.04 x (kW)0.9 x (No of Pole pairs)2.5 -as per IEC 34-12 Torque in lb.ft = HP x 5250 rpm H = 2.31 x 10-10.(RPM)2.WR2 Machine MVA

Where Rotor WR2 = (Weight in lbs).(radius of gyration in feet)2

END

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