Table E- 6 Reliability Analysis, Dam Electrical Distribution

ETL 1110-2-560

30 Jun 01

Table E-6

Reliability Analysis, Dam Electrical Distribution

Adjusted

Component/Block

Quan.

Failure

Weibull

Environmental

Failure

Duty

Shape Factor, β

K Factor

Rate

Factor, d

Rate*

Circuit Breaker

2

0.3574

1.0

2

0.7148

0.5000

Conductors in Duct

1

0.5988

1.0

2

1.1976

0.5000

Conductors in Conduit

1

0.0300

1.0

2

0.0600

0.5000

RELIABILITY [R(t)] OF INDIVIDUAL COMPONENTS

Years in Service (Equipment is installed at time 0)

0

5

10

15

20

25

30

35

40

45

50

Year

1990

1995

2000

2005

2010

2015

2020

2025

2030

2035

2040

Circuit Breaker

1.0000

0.9845

0.9692

0.9541

0.9393

0.9247

0.9104

0.8962

0.8823

0.8686

0.8551

Conductors in Duct

1.0000

0.9741

0.9489

0.9243

0.9004

0.8771

0.8544

0.8323

0.8107

0.7897

0.7693

Conductors in Conduit

1.0000

0.9987

0.9974

0.9961

0.9948

0.9935

0.9921

0.9908

0.9895

0.9882

0.9869

HAZARD RATES [h(t)] OF INDIVIDUAL COMPONENTS

Year

1990

1995

2000

2005

2010

2015

2020

2025

2030

2035

2040

Circuit Breaker

0.0063

Conductors in Duct

0.0105

Conductors in Conduit

0.0005

RELIABILITY OF SYSTEM

[Rsys(t)]

Year

1990

1995

2000

2005

2010

2015

2020

2025

2030

2035

2040

1.0000

0.9428

0.8890

0.8382

0.7903

0.7451

0.7025

0.6624

0.6245

0.5888

0.5552

** Failure Rate per 106 Operating Hours from Reliability Analysis Center (1995) Std 493, Appendix ANSI/IEEE (1980).

Failure Rate per E6 Operating Hrs from NPRD Data 1995 (Ref. f) and IEEE and Appendix A of A (Ref. j)

E-11