{[ promptMessage ]}

Bookmark it

{[ promptMessage ]}

582_L1 - £ éflawcklfiOO SPRING loco [email protected]:[email protected]@678...

Info iconThis preview shows pages 1–11. Sign up to view the full content.

View Full Document Right Arrow Icon
Background image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full Document Right Arrow Icon
Background image of page 2
Background image of page 3

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full Document Right Arrow Icon
Background image of page 4
Background image of page 5

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full Document Right Arrow Icon
Background image of page 6
Background image of page 7

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full Document Right Arrow Icon
Background image of page 8
Background image of page 9

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full Document Right Arrow Icon
Background image of page 10
Background image of page 11
This is the end of the preview. Sign up to access the rest of the document.

Unformatted text preview: £581 55 581 . éflawcklfiOO , SPRING - loco [email protected] :[email protected]@678§ 12 @14. 15 9 1o 11 12 1315 19®21®23®2Z 151718®2o 2122 [email protected] 28 30 31 23 24 25 281 27 28 29 30 ® 2 Q 4 5 5W 7 @191112 13 14E118'171819 20 E 21 22 23 24 25 28 27 z 28 29 30 31 EE 582 Day 1 - Introduction Monthly, March 6, 2000 Instructor. Bruce Mork Michigan Technological University Time-Domain Modeling Nonlinear & Frequency—Dependent! Slow Transients Switching Transients Fast Front Transients 0 Very Fast Front Transients 0 Protection and Control 0 Power Electronics . Switching Transients (Energizing & Deenergizing) ' Capacitor, Reactor Switching - Transformer Inrush, Black Start, etc. ' Line Energization - Concerns: — TRV, Voltage Stresses, Insulation Coordination, arrester heating — Test: pre~insertion resisistors, inductors, and synchronized closing devices. Transient Studies Why is there an increased need? Increase in compensation. Pushing system harder. Increase in system nonlinearities: magnetic + FACT S. Trend toward reduced system losses (= damping) can exacerbate transient problems. Nonlinear behaviors cannot be predicted by means of extrapolation or interpolation of observed behavior. System protection designed on assumption of a linearized system may misoperate. (Essential to perform transient simulation and test its operation). Economic pressure to design less conservatively requires closer scruitiny of equipment specification. Slow Transients Ferroresonance - Small-signal torsional oscillations - Large-signal shaft transient stresses 0 Turbine Blade Vibrations - Fast Bus Transfer - Controller Interactions - Harmonics interaction Fast Front Transients 0 Lightning Surges: 10 kHz to 1 MHZ 0 Determine line flashover rates (LFOR) - Arrester Application Guidelines — Establish/verify surge arrester ratings — Determine optimum arrester location — Minimum L—L and L—G clearances — Optimum location of surge capacitances — Determine MTBF for a substation Very Fast Transients (100 kHz - 50 MHz) - Gas-Insulated Substations 0 Switching surges: 4-100 ns rise time - Oscillations: 1.5 - 2.5 pu of V-peak - Not a problem for lower voltage class equipment (BIL is plenty high) - Problem for higher voltage classes 0 Center conductor to enclosure - flashover sometimes enclosure-ground Power Electronics Motor Drives FACTS, SVCs, static phase shifters... HVDC terminus Arc Furnace AC-DC converters Custom Power Concerns: — Verify application, predict system performance, identify possible problems, evaluate poss'ble solutions . -, J/L Wk. LL. I 1 System Protection - Relay operation depends on VTs, CTs, CCVTs, MOCTs. - Sometimes there’s a need to model HV system, instrument transformers, and the relays themselves. - Electromechanical, static, and micro- processor based relays can be -- man” .1.. \) Ideh'k‘g infi'ial 1,: fined S+a+e Lb) =- IO‘; 5,: ‘1‘: R L hm; C onsi’gn‘k' 7. increase R -> Fafi’er (“o-*2. 6P Chem e.) ((35 +I'MQ. 4’. {no.\ S+¢~+¢. A Slower n31 «F +5 Glam e, ion er 42“?th ‘. Mt clr‘nle: (65"0 n52 l +1 me Cbh$+$hh Campare. T +0 éo- HE Fenoé £510 ‘Rr Tran5wn8336n SDS+€M ATP BASKJ»: 6 (S 33h? Chck 'k menu 6F elemen'b C (‘5’ 0.? vii .3 «IA/AW ’1’“ --7777'7—— 2.3 LQ-H- 4’13 Qisk)’ - (“KW-+2. \ ;c .. Par may: 3) 9.3%ch \4 38 / 4) Che“ an m ‘Makfl Hake: Fsle. ‘ "62:25‘13 A”? ER) '6‘" ATP .37. Rum VLJWH ...
View Full Document

{[ snackBarMessage ]}