|
Power Reliability
a. The Transmission Line
Forced Tripping Outage Rates since 2000:
| Year |
2000 |
2001 |
2002 |
2003 |
2004 |
2005 |
2006 |
2007 |
| Outage
Rate |
3.1 |
2.0 |
1.4 |
0.8 |
1.0 |
0.5 |
1.0 |
0.6 |
The above figures
consist of all trippings due to transient faults, e.g lightning and
vegetation faults, non-line faults e.g substation equipment /
relay failure, human factors. Efforts had been made to
reduce all these faults by replacing faulty equipment, conducting
reality checks and enforcing strict procedures for online tests.
b. System
performance measures is using Transmission Delivery Point
Performance (TDPP). The present performance levels since 2001:
(system minutes):
| 2001 |
2002 |
2003 |
2004 |
2005 |
2006 |
2007 |
|
25.61 |
36.7 |
2.04 |
21.36 |
8.1 |
14.52 |
1.21 |
Asset Management
a. To improve and
maintain the reliability of major transmission equipment so as to
meet the following targets :
| EHV
Equipment |
Type
of Outage |
Outage
Rate |
Mean
Outage Duration (min) |
| Lines |
Forced |
< 2.00 per 100cct.km |
|
| Transformers |
Forced |
≤ 0.40 per 100 MVA |
≤ 580 |
b. To improve and
maintain the availability of supporting equipment and facilities
so as to meet the following targets:
| Division |
Type
of Equipment |
Reliability |
| Protection |
Protection
system |
≥
95 %
|
| Division |
Type
of Equipment |
Availability |
MTTR |
| Communication |
Pilot Cables system
PLC/FO system
PABX/PAX system |
≥ 99.9 %
≥ 99.9 %
≥ 99.9 % |
≤
4 days
≤
3 days
≤
1 days |
| System
Automation |
SCADA Master Station
SCADA RTU System |
≥ 99.8 %
≥ 99.6 % |
≤
1 days
≤
1 days |
Notes: MTTR: Mean time to repair
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