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PS3: Protection & Control of Series Compensated Networks

PS3: Protection & Control of Series Compensated Networks. Q8 b) What are the requirements of utilities in terms of certification tests for relays and/or protection systems before applying these to series compensated lines?. Electricity Supply Network. 1998 330KV Double Circuit 225km.

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PS3: Protection & Control of Series Compensated Networks

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  1. PS3: Protection & Control of Series Compensated Networks Q8 b) What are the requirements of utilities in terms of certification tests for relays and/or protection systems before applying these to series compensated lines?

  2. Electricity Supply Network

  3. 1998 • 330KV • Double Circuit • 225km SP AusNet Network

  4. No 1 line No 2 line Project Objectives DDTS Compensation: 50 % Transfer Capability restored to 1500 MW, 36% improvement Total project cost $A13.5 M Completion period 14 months SMTS

  5. SMTS DDTS Discharge Reactor MOV Spark Gap Bypass Circuit Breaker Capacitor Arrangement

  6. Distance Relay Problems • Distorted Distance Measurement • Incorrect Directionality (Voltage & Current inversions) • Transient over- and under-reach ( Sub- sychronous Transient Oscillations) • Nonlinear & solid by-passing of capacitors initiate transient changes of : • Voltage magnitude and polarity • Impedance measured

  7. B C A D Line # 1 Line # 2 Line # 3 E E Incorrect Reach

  8. Fault Simulations

  9. First cycle Second cycle Third cycle Z Internal Fault Forward (operating) reach jX dynamic static R Reverse (blocking) SMTS, No 1 (Faulty) Line Relay, Fault on No 1 line, MOV, no Gap

  10. First cycle Second cycle Third cycle External Fault Forward (operating) reach jX Z dynamic static R Reverse (blocking) SMTS, No 2 (Healthy) Line Relay, Fault on No 1 line, MOV, no gap

  11. Relay Selection • 2 x Distance + existing Power Line Carrier • reliable • Under/over reach • transmission time 30ms • 1 x Current Diff + new μWave Radio • many faults faster than distance schemes • signal fading

  12. 60 50 40 X SEL/S X SEL/D 30 X LFCB/S X LFCB/D 20 Y ALPS/S Y ALPS/D 10 0 SMTS Loc 1 Loc 2 Loc 3 Loc 5 DDTS 1 2 3 5 Operating Times

  13. Summary • Transient fault studies essential for SC Lines • Difficulty to gather data. • Automatic Test Equipment extremely useful design tool • Derived from paper:“Fault simulation studies for protection of series compensated lines” • Adam Klebanowski, GPU PowerNet, Victoria, Australia • Asia Pacific Regional ProTest (DOBLE) User Group Meeting, Melbourne, Australia, 1999 • adam.klebanowski@sp-ausnet.com.au

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