Stellar Engineering offers comprehenisive power system engineering studies and reporting with practical and useful results and recommendations. Our services will eliminate your power quality problems, improve reliability and safety of your system.
Stellar Engineering’s facility engineering studies are designed to reduce risk of electrical fire, property damage, and business interruptions.
Short Circuit Study
The National Electrical Code (NEC) requires that all short circuit interrupting devices have ratings sufficient for the current which must be interrupted. A severe fault (short circuit) can have catastrophic consequences on your electrical system. All electrical distribution equipment installed must be able to withstand the available short circuit current, and calculations should be periodically maintained or updated whenever changes are made to the electrical system or the utility short circuit contribution changes.
Need for Short Circuit Analysis
Short Circuit analysis is required to ensure that existing and new equipment ratings are adequate to withstand the available short circuit energy available at each point in the electrical system. A Short Circuit Analysis will help to ensure that personnel and equipment are protected by establishing proper interrupting ratings of protective devices (circuit breaker and fuses). If an electrical fault exceeds the interrupting rating of the protective device, the consequences can be devastating. It can be a serious threat to human life and is capable of causing injury, extensive equipment damage, and costly downtime.
Benefits of a Short Circuit Analysis
Performing a Short Circuit Study provides the following benefits:
⦁ Reduces the risk a facility could face and help avoid catastrophic losses.
⦁ Increases the safety and reliability of the power system and related equipment.
⦁ Evaluates the application of protective devices and equipment.
⦁ Identifies problem areas in the system.
⦁ Identifies recommended solutions to existing problems.
Protective Coordination Study
Electrical system protection and coordination studies are key components to ensuring that a facility’s electrical system is operating in a safe and reliable manner. The goal of proper coordination is to localize the overcurrent condition (a hazardous fault current) to restrict outages to the affected circuit or equipment. Proper coordination ensures the safety of the rest of your system when a fault occurs, and is accomplished by optimizing the selection of overcurrent protection devices and their ratings and/or settings.
Need for Protective Device Coordination Study
Any time a change is made to a power system, the available short circuit and protective device coordination should be evaluated. In order to ensure a safe, reliable design, each device should be evaluated for proper short circuit levels and acceptable voltage ratings. The coordination of protective devices is essential in order to minimize the risk of injuries, equipment damage and down time.
Benefits of a Protective Device Coordination Study
⦁ Increase equipment protection and operating efficiency
⦁ Ensure protective device coordination by setting the protective devices to trip in sequence
⦁ Increase facility reliability by limiting the effects of a disturbance (fault/overload) to smaller areas of the distribution system
⦁ Will improve system reliability and help prevent downtime
⦁ Prevent damage by identifying underrated equipment
⦁ Prevent damage by identifying overloaded equipment
Load Flow Study
The load flow model of a power system is essential in determining acceptable voltage levels and rating of equipment. Performing a load flow study will ensure proper voltage levels are maintained during various system operating conditions and that equipment are not overloaded. Excessive voltage drops can cause equipment overheating and tripping of critical loads.
Need for Load Flow Study
A load flow study should be performed whenever a change is made to a power system. These changes include system design and adding or removing loads. Also, load flow study is used investigate problems with the electrical system like, overloading or undervoltage
Benefits of a Load Flow Study
⦁ Aid in future planning and present day operation by demonstrating how the electrical system will perform during normal and emergency operating conditions
⦁ Determine the proper transformer tap settings so that the correct voltage will be present at motors and other loads during full load and no load conditions
⦁ Identify under-utilized equipment to which will allow for future load growth
⦁ Identify overloaded equipment
⦁ Increase the distribution system operating efficiency and determine the most optimum operating configuration
Power Quality Study (Harmonics and Power Factor)
In today’s business environment, power quality has become a focal point with power system design, operation and maintenance. Voltage transients, harmonics and electrical noise can all have damaging effects to equipment and computers. Harmonic studies are performed to determine harmonic distortion levels and filtering requirements within a facility and to determine if harmonic voltages and currents are at acceptable levels.
Stellar Engineering evaluates the electrical energy going to equipment in the form that will allow the system to operate properly, efficiently and minimize long term risk to that equipment. Proper power quality maintains control over process automation equipment, digital controls, and motor drives. Poor voltage waveforms can lead to unnecessary and costly disruptions for electronically controlled equipment. The need for proper Power Quality has also become increasingly important for companies interested in energy conservation and continuous control
Benefits of a Power Quality Study
⦁ Avoids damage due to excessive harmonic currents
⦁ Ensures sensitive electronic equipment will not malfunction due to excessive harmonic voltage distortion.
⦁ Satisfies the utility's voltage and current harmonic distortion requirements.