ps3: protection & control of series compensated networks
DESCRIPTION
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. - PowerPoint PPT PresentationTRANSCRIPT
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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?
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Electricity Supply Network
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Loy Yang
Red Cliffs
Kerang
Horsham
Portland
Bendigo
Ballarat
Wodonga Shepparton
Glenrowan
Hazelwood/Morwell
Mount Beauty
MelbourneMetro
Terang
Dederang
Yallourn
DartmouthMcKay Creek/West Kiewa
Eildon
Anglesea
Moorabool
GeelongPt. Henry
500 kV
330 kV
220 kV
275 kV
SP AusNet Network
• 1998
• 330KV
• Double Circuit
• 225km
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Project ObjectivesSM
TS
DDTS
No 1
line
No 2
line
Compensation: 50 % Compensation: 50 %
Transfer Capability restored to 1500 MW, Transfer Capability restored to 1500 MW, 36% improvement 36% improvement
Total project cost $A13.5 M Total project cost $A13.5 M
Completion period 14 monthsCompletion period 14 months
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Capacitor Arrangement
DDTSSMTS
Bypass Circuit Breaker
Spark Gap
MOV
DischargeReactor
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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
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Incorrect Reach
AB
E
D
E
C
Line # 2
Line # 1
Line # 3
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Fault Simulations
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Internal Fault
static
First cycleSecond cycleThird cycle
R
jX
dynamic
Reverse (blocking)
Z
Forward (operating) reach
SMTS, No 1 (Faulty) Line Relay, Fault on No 1 line, MOV, no Gap
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External Fault
First cycleSecond cycleThird cycle
R
jX
dynamic
Reverse (blocking)
Z
static
Forward (operating) reach
SMTS, No 2 (Healthy) Line Relay, Fault on No 1 line, MOV, no gap
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Relay Selection
• 2 x Distance + existing Power Line Carrierreliable Under/over reach transmission time 30ms
• 1 x Current Diff + new μWave Radiomany faults faster than distance schemes signal fading
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Operating Times
0
10
20
30
40
50
60
SMTS Loc 1 Loc 2 Loc 3 Loc 5 DDTS
X SEL/S
X SEL/D
X LFCB/S
X LFCB/D
Y ALPS/S
Y ALPS/D
1 2 3 5
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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– [email protected]