Table E-3 Reliability Analysis, Lock Electrical Distribution

ETL 1110-2-560

30 Jun 01

Table E-3

Reliability Analysis, Lock Electrical Distribution

Adjusted

Component/Block

Quan.

Failure

Weibull

Environmental

Failure

Duty

Shape Factor, β

*

K Factor

Rate

Factor, d

Rate

Utility Power Supply

1

61.3014

1.0

2

122.6028

1.0000

Conductors in Duct

2

0.5988

1.0

2

1.1976

1.0000

Circuit Breaker

1

0.3574

1.0

2

0.7148

1.0000

Generator

1

7.6500

1.0

2

15.3000

0.0800

Transfer Switch

1

6.3978

1.0

2

12.7956

1.0000

Switchgear, Bus, Bare

1

0.5051

1.0

2

1.0102

1.0000

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

Utility Power Supply

1.0000

0.0047

0.0000

Conductors in Duct

1.0000

0.9489

0.9004

0.8544

0.8107

0.7693

0.7300

0.6927

0.6573

0.6237

0.5918

Circuit Breaker

1.0000

0.9692

0.9393

0.9104

0.8823

0.8551

0.8287

0.8032

0.7784

0.7544

0.7312

Generator

1.0000

0.9478

0.8983

0.8514

0.8070

0.7649

0.7249

0.6871

0.6512

0.6172

0.5850

Transfer Switch

1.0000

0.5710

0.3260

0.1861

0.1063

0.0607

0.0346

0.0198

0.0113

0.0064

0.0037

Switchgear, Bus, Bare 1.0000

0.9567

0.9153

0.8757

0.8378

0.8015

0.7668

0.7336

0.7019

0.6715

0.6424

HAZARD RATES [h(t)] OF INDIVIDUAL COMPONENTS

Year

1990

1995

2000

2005

2010

2015

2020

2025

2030

2035

2040

Utility Power Supply

1.0740

Conductors in Duct

0.0105

Circuit Breaker

0.0063

Generator

0.1340

Transfer Switch

0.1121

Switchgear, Bus, Bare 0.0088

0.0088

RELIABILITY OF SYSTEM

[R (t)]

sys

Year

1990

1995

2000

2005

2010

2015

2020

2025

2030

2035

2040

1.0000

0.8885

0.7631

0.6566

0.5649

0.4861

0.4182

0.3599

0.3096

0.2664

0.2292

* Failure Rate per 106 Operating Hours from Reliability Analysis Center (1995) and Appendix A of ANSI/IEEE (1980).

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