What is Coordination Study?
A coordination study help facilities evade accidents and to provide a harmless, reliable and effective operation of an electrical distribution system.
The aim of a Protective device coordination study is to attain an optimum balance between equipment safety and careful isolation. A coordination study evaluates the impacts of short circuit and equipment failures within a facility and determines the effects on the facility operation.
The NEC speaks about the importance of coordination study in articles 110-9, 110-10, 240, and 517.17.
Why Required?
The Coordination study provides the electrical equipments with necessary protection whereas selecting suitable types and device settings to guarantee least service interruption under overload and short circuit conditions. This study is combined with the Arc Flash Hazard Analysis, which is performed, in order to identify the specific arc flash hazard at a given piece of equipment within a facility.
When Needed?
This could be done as frequently as required, or when the system is designed primarily, or on daily basis or when any change arises in the power company and due to the addition of electrical equipment.
Selective coordination requirements per various industry standards
NFPA 110 Standard for Emergency and Standby Power Systems
The overcurrent protective devices in the EPSS shall be coordinated to optimize selective tripping of the circuit overcurrent protective devices when a short circuit occurs.
NEC Standard for Electrical Safety
Localization of an overcurrent condition to restrict outages to the circuit or equipment affected, accomplished by the selection and installation of overcurrent protective devices and their ratings or settings for the full range of available overcurrents, from overload to the maximum available fault current, and for the full range of overcurrent protective device opening times associated with those overcurrents.
IEEE Std. 241 IEEE Recommended Practice for Electric Power Systems in Commercial Buildings (Gray Book)
…On all power systems, the protective device should be selected and set to open before the thermal and mechanical limitations of the protected components are exceeded.
The goal of a Protective Device Coordination Study is to achieve an optimum balance between equipment protection and selective isolation that is consistent with the operating requirements of the overall power system.
Do You Really Need A Coordination Study?
If you can answer yes to any of these questions or if any of these questions describe your situation, you should consider such a study.
I require analysis for arc flash hazards regarding my electrical network.
The operations of my business suffered prolonged, high-cost time out due to recent electrical appliances’ failure.
I am currently starting or in the initial design phase for an office building which will accommodate my workers and the office will go beyond 1 million dollars.
Do I own or am I thinking of installing standby UPS, generators, or static transfer switches in my electrical network?
In case of power outage or failure, would the time-out cost surpass $3000/hour?
Do I possess essential items or equipment, which in case of power failure, be damaged?
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AllumiaX, LLC provides independent and third-party engineering support by presenting comprehensive deliverable reports backed by industry standards and best practices, analysis work based on industry-leading software (ETAP), and proven results based on accurate modelling and calculations.
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Get a quote within 24 hours on most typical power system studies. Enter the project specifics with the most accurate data you have, and get a quote locked for 45 days. After submitting, you may either accept the quote, accept it anytime during the lock period, decline/close it, or allow it to expire with no obligation.
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Study Methadology
A protective device coordination study evaluates the effects of equipment failures and fault currents within a power system and analyzes the impacts on the system operation. Data collection procedures are performed as per NEC requirements, after which a comprehensive model of the system is developed on power systems software. A short circuit study is first performed to calculate the fault currents at each electrical point in the system.
The protective devices are then selected and adjusted to minimize the impact of equipment failures within a system. The time-current characteristic curves of the protective devices are analyzed and comparisons are made to identify areas of mis-coordination. Adjustments are done for each case, thus ensuring the best achievable coordination. Coordination studies are performed as per the latest IEEE, NEC, ANSI & NFPA standards.
AllumiaX, LLC provides independent and third-party engineering support by presenting comprehensive deliverable reports backed by industry standards and best practices, analysis work based on industry-leading software (ETAP), and proven results based on accurate modelling and calculations. We work closely with our clients in collecting the data, modeling the system, simulating faults and abnormalities, plotting the characteristic curves & offering solutions in compliance with the latest industrial standards.
Executive Summary
Power blackouts are a frequent occurrence in industrial facilities. The reason could be a fault in the utility side or a fault on the load ends of the feeders. How will we get to know whether a circuit breaker is capable of interrupting these electrical faults in the system? If these high fault currents exceed the interrupting capability of the protective device, it results in an increase in the likelihood of an explosion which could potentially damage the device itself. The answer lies with a coordination study, which could help in preventing a certain equipment failure from taking down the entire facility resulting in a blackout.
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