Reliability Of Redundant UPS Systems
Reliability Of Redundant UPS Systems
Multi-module UPS With Centralized Bypass
Q2
Q8
Utility Source
SSM
K6
Communication
Rectifier
Inverter
K7
Battery
Load
Q1
Rectifier
Inverter
K7
Battery
2
GE Consumer and Industrial
William K. Vassallo
August 2004
Multi-module UPS With Decentralized Bypass
Q2
Q8
Utility Source
SSM
K6
Rectifier
Q1
Inverter
K7
Battery
Communication
Load
Q2
Q8
SSM
K6
Rectifier
Q1
Inverter
K7
Battery
3
GE Consumer and Industrial
William K. Vassallo
August 2004
UPS System Reliability
Mean Time Between Failure Assumptions:
Component
MTBF
Description
RBI
25000
Rectifier, Inverter & Battery (combined)
BUS
150000
Communication Bus
K7
700000
Inverter Output Disconnect
Mains
50
Bypass Power Source
K6
700000
Backfeed Protection Device
Byp
500000
Static Bypass Switch
Master
750000
Master Control
K8
700000
Bypass wrap-around Device
Mean Time To Repair Assumptions:
4
Component
MTTR
Description
RBI
6
Rectifier, Inverter & Battery (combined)
Mains
0.1
Bypass Power Source
GE Consumer and Industrial
William K. Vassallo
August 2004
Topology – Centralized vs. Decentralized Bypass
(Single Communication Bus)
5
6
x 10
Red = Centralized Bypass
Blue = Decentralized Bypass
5
4
Influence Of Bypass Configuration
3
Number Of
UPS Modules
2
3
4
5
6
7
8
2
1
0
5
2
3
4
GE Consumer and Industrial
William K. Vassallo
August 2004
5
6
7
8
Centralized
Bypass
193000
164000
144000
127000
114000
104000
95000
Decentralized
Bypass
566000
377000
282000
226000
188000
161000
141000
Communication Bus – Single vs. Redundant
(Decentralized Bypass)
6
3.5
x 10
Red = Single Communication Bus
Blue = Redundant Communication Bus
3
2.5
2
Influence Of Communication Bus
Number Of
UPS Modules
2
3
4
5
6
7
8
1.5
1
0.5
0
6
2
3
4
GE Consumer and Industrial
William K. Vassallo
August 2004
5
6
7
8
Non-Redundant
Communication
566000
377000
282000
226000
188000
161000
141000
Redundant
Communication
3187000
2109000
1570000
1247000
1031000
878000
762000
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