(participation = half letter grade, 5%)

Transcription

1 EE Lecture 11 Wed Feb 7, 2018 Topics for Today: Startup Web page: Software - Matlab. ATP/EMTP [ License - ] ATP tutorials posted on our course web page EE5220-L@mtu.edu (participation = half letter grade, 5%) HW#4 soon posted. Partnered exercise. Due Wed Feb 14 th. ATP Simulation pointers Cap Bank Switching (continued) Circuit Breaker ratings - Capacitive Switching Parameters Cap Bank configurations Current Limiting Reactors ATP - how it works internally Conductance matrix formulation Rs, Ls, Cs Transmission lines

2 ATP Simulation Pointer of the Day: Select Auto-Detect Simulation Errors so that you are informed of anything unusual (not only errors or kill-codes) that may affect your simulation results. If you are aware of it, you can then fix it...

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15 70 Chapter 7 Table 4 Transformer and Bushings BILs and BSLs System nominal1 max system voltage, kv Transformers BIL, kv Transformers BSL, kv Transformer bushings BIL, kv Transformer bushings BSL, kv 30, 45 45, 60 60, 75 75, 5 5, , , * * * * * *I * Commonly used. Source: Ref. 7, 8. 2 Copyright 1 by Taylor & Francis Group, LLC

16 Specifying the insulation Strength f f Table 5 Insulation Levels for Outdoor Substations and Equipment NEMA Std, 6, outdoor substations Circuit breakers Disconnect switches 10s power Rated max frequency BSL, kv voltage, kv BIL, kv voltage, kv BIL, kv BSL, kv BIL, kv estimate Source: Ref. 5,. Table 6 BILsIBSLs of Gas Insulated Stations Max system voltage, kv IEC ANSI IEC [lo] ANSI [11] BIL, kv BSL, kv BIL, kv BSL, kv 3 Copyright 1 by Taylor & Francis Group, LLC

17 Chapter 1 Table 7 BILs of Cables (No BSLs provided), AEIC C54-7 Rated voltage, kv BIL, kv Source: Ref. 12. Table 8 IEC 71.1: BILs are Tied to Max. System Voltages for Max. System Voltage from 1 to 245 kv Max system voltage, kv BILs, kv Max system voltage, kv BILs, kv or or 60 60, 75 or or or 5 5, 125 or or , 550, or , 650, or , 750, 850, 50, or 1050 Source: Ref. 3. Table IEC BILIBSLs, from IEC Publication Max. system Phaseground Ratio voltage, kv BSL, BSLg, kv BSLp/BSLg BIL, kv or or or or or S O 1175 or or 1425 Source: Ref Copyright 1 by Taylor & Francis Group, LLC

18 Onwards are pages from standards assembled together for circuit breakers, transformers and bushings. 5

19 IEEE Std C IEEE STANDARD FOR STANDARD GENERAL REQUIREMENTS FOR LIQUID-IMMERSED DISTRIBUTION, POWER, AND REGULATING TRANSFORMERS 5.5 Voltage ratings and taps General Standard nominal system voltages and maximum system voltages are included in ANSI C84.1 and listed in Table 4. Table 4 Relationship of nominal system voltage to maximum system voltage and basic lightning impulse insulation level (BIL) for systems 765 kv and below Application Nominal system voltage, rms (kv) Maximum system voltage, rms (from ANSI C84.1) (kv) Basic lightning impulse insulation levels (BIL) in common use (kv crest) Distribution Power Copyright 2007 IEEE. All rights reserved. Authorized licensed use limited to: Michigan Technological University. Downloaded on February 2, 2010 at 16:50 from IEEE Xplore. Restrictions apply.

20 IEEE Std C IEEE Standard for AC High-Voltage Circuit Breakers Rated on a Symmetrical Current Basis Preferred Ratings and Related Required Capabilities for Voltages Above 1000 V Table 16 Preferred dielectric withstand ratings for circuit breakers applied in gas-insulated substations a Line No. 1 2 Rated maximum voltage U r kv, rms Rating table Power frequency 1 min dry Dielectric withstand test voltages Impulse test (2) Switching impulse (2) Full wave withstand (6) Withstand voltage terminal to ground with circuit breaker closed kv, peak Withstand voltage terminal to terminal on one phase with circuit breaker open kv, peak No. kv, rms kv, peak Col 1 Col 2 Col 3 Col 4 Col 5 Col , 5 1, , 5 1, a Numbers in parenthesis refer to the items in Copyright 200 IEEE. All rights reserved. 7 Authorized licensed use limited to: Michigan Technological University. Downloaded on February 2, 2010 at 16:55 from IEEE Xplore. Restrictions apply.

21 DIMENSIONS FOR OUTDOOR APPARATUS BUSHINGS IEEE Std C Annex A (informative) Electrical insulation characteristics Table A.1 includes the electrical insulation characteristics for ratings that were a part of IEEE Std C , but which were not included in Table 1 of this standard. This information is provided for replacement purposes only. Table A.1 Electrical insulation characteristics for outdoor apparatus bushings (nominal system voltage kv) (for replacement purposes only) Basic lightning impulse insulation level (BIL) System voltage Rated maximum line-toground voltage (kv) (kv) (kv) (mm) a Creepage distance minimum 1 min dry rms Withstand tests 60 Hz Lightning impulse 10 s wet rms Full wave Chopped wave crest minimum time to flashover 2 µs withstand 3 µs withstand Wet switching impulse (in) (kv) (kv) (kv) (kv) (kv) (kv) Col. 1 Col. 2 Col. 3 Col. 4 Col. 5 Col. 6 Col. 7 Col. 8 Col. Col TR b TR b NOTES 1 Dry negative switching impulse withstand voltage of the bushing must be at least equal to the dry switching impulse withstand voltage for the corresponding BIL specified in IEEE Std C The above ratings are not a part of the main standard and are included in this annex for replacement purposes only. a b Primary units for dimensions are in millimeters. For reduced BIL transformers only. 8 Copyright 2000 IEEE. All rights reserved. 11 Authorized licensed use limited to: Michigan Technological University. Downloaded on February 2, 2010 at 17:0 from IEEE Xplore. Restrictions apply.

22 References [1]. "IEEE Standard for Standard General Requirements for Liquid-Immersed Distribution, Power, and Regulating Transformers," IEEE Std C (Revision of IEEE Std C ), vol., no., pp.c1-57, Feb [2]. "IEEE Standard for AC High-Voltage Circuit Breakers Rated on a Symmetrical Current Basis - Preferred Ratings and Related Required Capabilities for Voltages Above 1000 V," IEEE Std C , vol., no., pp.1-46, Nov [3]. "IEEE Standard General Requirements and Test Procedure for Power Apparatus Bushings," IEEE Std C (Revision of IEEE Std C ), vol., no., pp.0_1-17, 2005 [4]. "IEEE Standard Performance Characteristics and Dimensions for Outdoor Apparatus Bushings," IEEE Std C , vol., no., pp.1-, 2000 [5]. Insulation Coordination for Power Systems,Andrew R. Hileman, Monroeville, Pennsylvania, USA References from Hilemans book :-