Arc Flash Study
Arc Flash’s study is one of the most important in the context of occupational electrical safety, as it evaluates the thermal and mechanical effects of an electric arc on people and equipment in case of failure. This study determines parameters such as incident energy, approximation limits, necessary PPE category and maximum safe exposure time, ensuring compliance with international standards such as IEEE 1584, NFPA 70E, IEC 61482 and national occupational safety regulations. Performing this type of analysis is complex, as it involves not only short-circuit calculations but also the interaction between protective devices, trip times, system impedances, and variable operating conditions. In this scenario, power system analysis software becomes an essential tool, bringing precision, agility, and reliability to the process. With the advent of specialized power system analysis software, the analysis process has become more agile, accurate, and integrated, bringing numerous practical and technical advantages:
Calculations based on internationally recognized standards:
The software uses algorithms based on standards such as IEEE 1584 and NFPA 70E, ensuring consistent results that are accepted in safety audits. This eliminates uncertainty and ensures that the calculated parameters can be officially used to define procedures and signaling.
Integration with short-circuit and protection studies:
The incident energy calculation depends on the short-circuit current and the protection’s operating time. The software automatically integrates these factors, considering selectivity, relay and circuit breaker settings, and the contribution of motors and generators. This integration provides realistic results and prevents under or overestimation of risk.
Incident energy calculation and approximation limits:
The software accurately determines:
- Incident energy (cal/cm²) at different points of the installation;
- Arc Flash Boundary, minimum safety distance;
- Risk category and level of PPE required;
- Approach limits according to voltage and exposure time.
These parameters are essential to protect workers from severe burns and other risks associated with arc flash.
Analysis of multiple operational scenarios:
The software allows you to simulate different conditions, such as:
- Normal and emergency operation;
- Parallelism or disconnection of transformers, generators, motors;
- Changes in protection settings;
- Maintenance scenarios.
This flexibility ensures that the analysis considers all possible operating conditions, increasing the robustness of the study.
Ease of viewing and interpreting results:
The software displays the results directly on the single-line diagram, highlighting busbars and equipment with color codes and visual alarms, depending on the severity of the risk. This makes it easier to identify critical areas and prioritize mitigation measures
Optimized PPE definition:
Based on the results, it is possible to define appropriate PPE for each point of the installation, avoiding both under-protection (risk to the worker) and over-protection (unnecessarily expensive and uncomfortable equipment)
Risk mitigation support:
The software not only calculates incident energy, but also allows you to evaluate mitigation strategies, such as:
- Precise settings of relays and circuit breakers;
- Installation of arc protection relays;
- Installation of current limiting resistors;
- Logical coordination of protections;
- Segregation of panels and physical barriers.
Thus, the study ceases to be just a diagnosis and becomes an active tool for risk reduction.
Arc Flash Label Generation:
One of the great features is the automatic issuance of Arc Flash labels, containing information such as incident energy, approach limits, and required PPE, in accordance with NFPA 70E. These labels can be printed and affixed directly to the equipment, increasing operational safety.
Regulatory compliance and security audits:
Arc Flash analysis is frequently required by occupational safety standards, regulatory agencies, and internal audits. The software generates standardized, detailed reports that document the entire methodology and results, ensuring traceability of the analyses.
Integration with other electrical system studies:
Arc Flash is closely linked to other studies:
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- Short circuit, which provides fault currents for calculations;
- Protection and selectivity, which defines action times;
- Power flow, which determines loading conditions before the fault;
- Stability, in the case of systems with their own generation.
- Short circuit, which provides fault currents for calculations;
This integration ensures that the results are consistent and complete, faithfully representing the actual behavior of the system.