CALCULATION
Overview
Challenge
A reliability study is used to evaluate the ability of a power system to provide continuous supply considering the probability of component failures.
It allows to:
- assess probability of supply interruption
- determine outage frequency and duration
- identify weak points in the system
- evaluate impact of failures on industrial processes
What it means
Any power system consists of multiple components, each of which may fail.
Even if the system performs well under normal operating conditions, it is important to understand:
- how often failures occur
- how long restoration takes
- what impact these failures have on consumers
In practical terms, this study evaluates how frequently and how severely the system may fail under real operating conditions.
Applications
- design of new power systems
- selection of redundancy schemes
- analysis of existing system reliability
- evaluation of impact of failures on industrial processes
- justification of investments in reliability improvement
- optimization of system structure
Conditions Considered
The study may include:
- failure of individual components (lines, transformers, generators)
- combined failure scenarios
- different redundancy configurations
- normal and post-fault operating conditions
Parameters Analyzed
- failure probability of system components
- mean time to repair (MTTR)
- outage frequency
- outage duration
- reliability indices (SAIDI, SAIFI, etc.)
- impact of failures on load
When the Study is Required
- during design of new facilities
- when selecting redundancy schemes
- during modernization of existing systems
- when analyzing frequent outages
- when improving system reliability
- when justifying capital investments
What the Study Provides
A reliability study allows to:
- identify the most vulnerable system components
- assess adequacy of redundancy
- identify critical failure scenarios
- evaluate impact on industrial processes
- justify reliability improvement measures
- select optimal system structure
Deliverables
The final report includes:
- system reliability indices
- assessment of failure probability and consequences
- analysis of weak points
- conclusions and recommendations for improving reliability
Customer Value
- improved reliability of power supply
- reduced downtime risk
- reduced losses due to outages
- justified investments in system development
- optimized network structure
Why it matters
Even infrequent failures can have significant consequences:
- production shutdowns
- product losses
- disruption of technological processes
This study allows these risks to be quantified and mitigated in advance.
Input data
- Single-line diagrams
- Utility system parameters
- Generating equipment parameters
- Transformer, cable, and overhead line parameters
- Equipment failure statistics
- Restoration times for system components
- Load composition and structure
- Power system operating conditions
- Reliability requirements
Results
- Evaluation of reliability indices (SAIDI, SAIFI, etc.)
- Assessment of supply failure probability
- Evaluation of outage frequency and duration
- Identification of critical system components
- Assessment of impact on industrial processes
- Recommendations for reliability improvement
- Recommendations for redundancy and system configuration