Failure Mode Effect & Criticality Analysis (FMECA) · 2 esb.ie Introduction • Paul Clancy -...

Failure Mode Effect & Criticality

Analysis (FMECA)

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Introduction

• Paul Clancy - HV Substations Supervisor , ESB Networks

• ESB Company Standard - Commissioning

• Specification of the requirements for commissioning substations ,lines & cables

• Contributors

• Alan Rossiter

• James Finn

• Kieran French

• Dr . Maria Chiara Leva

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Mission Statements & Strategy

• ESB Networks - “committed to a safe and reliable network …”

• EirGrid - “task is to deliver a safe, secure and reliable supply of electricity – now, and

in the future…”

• SONI – “responsible for the safe, secure, efficient and reliable operation of the high

voltage electricity system..”

• National Grid UK – “leader in the development and operation of safe, reliable, and

sustainable energy infrastructure..”

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Human error fault categories 2000-2015

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System Disturbances & Behaviour of Protective Equipment 2015

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Objective

• Risk based Company Standard

• Contribute to the reliability and safety in substations

• Contribute to the continuous improvement of substation commissioning as the

data set increases

• Develop an objective auditing process

• Contribute to grid resilience by ensuring substation systems operate correctly

• Permissive tripping

• Auto reclosing

• Moisture ingress

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Standards

• IEC Standard - 31010-2009 Risk Management -Risk Management Techniques

• IEC 60812:2006 Analysis techniques for system reliability

• ESB Networks risk assessment procedure

• As Low As Reasonably Practicable (ALARP)

• Failure Modes & Effect Analysis (FMEA)

• CIGRE reliability survey data T

• The criteria for selecting severity, occurrence, and detection value based on the anchor

values obtained as reference from the CIGRE international enquiry on reliability of HV

equipment reports 2004 - 2007, parts 1 to 6.

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FMEA Definition

• IEC- 60182 defines FMEA as a systematic procedure for the analysis of a system

whose target is the identification of the potential failure modes, their causes and

effects on system performance. It is a bottom up failure analysis method that

highlights common failure causes of the system and provides a rank for each failure

mode related to element importance. It considers system parts and/or functions that

are most likely to fail.

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The FMEA includes

• A list of equipment failure modes

• The causes of these failures

• Local effects that refer to the consequences of each possible failure on the

system element

• Final effects that describe the impact of that possible failure on the whole

system

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Criticality Analysis

• A critically analysis (CA) assigns a Risk Priority Number (RPN) to each failure

mode. The RPN is calculated using the formula.

RPN = S × O × D

• S (Severity) represents the assessment of the worst potential consequences

resulting from an item failure

• O (Occurrence) denotes the probability of failure mode occurrence

• D (Detection) represents the chance to identify and eliminate the failure before

the system or people are affected.

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Risk Priority Number

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Risk Priority Number

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Conclusion

• ESB Networks - “ committed to a safe and reliable network ..”

• Risk based Company Standard

• Contribute to the reliability and safety in substations

• Contribute to the continuous improvement of substation commissioning as the data set

increases

• Develop an objective auditing process

• Contribute to grid resilience by ensuring substation systems operate correctly

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