power distribution - Siemens

Field ServicesPower System StudiesGeneral/SelectionShort Circuit StudyPower system specialists from Siemenswill determine the maximum duty thatyour system’s protective devices,transformers, and interconnections willbe subjected to in the event of threephase and/or line-to-ground faultconditions. In addition, we will providebasic information required to establishprotective relay settings.Coordination StudyUnder fault conditions, systems shouldisolate the faulted area to minimizedisturbance to the remaining system,and simultaneously limit damage toequipment. We will review thecharacteristics of your protectivedevices, then provide the settingsnecessary to ensure that your systemfunctions optimally should a fault occur.Harmonic AnalysisAs AC drives have become increasinglyprevalent in industry, we have seen theintroduction of destructive harmonics tomany systems. The power qualityexperts from Siemens will determine theextent and severity of harmonics in yoursystem, then recommend theappropriate means of limiting potentialdamage.Transient Stability StudyThis study is particularly valuable forfacilities that generate their own power,and those with very large motors. Ourpower system specialists will study thetransient response of rotating equipmentfollowing system disturbances, andanalyze system behavior in relation tothe power company tie.Protective Device EvaluationWith the objective of achieving optimumprotection, we will perform thenecessary calculations required to selectthe interrupting rating of power fuses,circuit breakers, and other protectivedevices.Power Quality AssessmentWith the proliferation of sensitiveelectronic equipment in recent years,power quality has become a majorconcern for industry. We performstructured, step-by-step studies withtimely diagnosis and expert solutions tothe complex challenges of utility andend-user power quality issues.Arc Flash StudyNFPA 70E recommends that an ArcFlash Hazard Analysis be performed priorto work on electrical equipment.Siemens will determine the incidentenergy levels, Arc Flash Boundary (AFB),and required level of Personal ProtectiveEquipment (PPE).Load Flow StudyThis steady-state analysis of yoursystem’s capability to supply theconnected load will produce a listing ofreal and reactive power flow in each lineor branch, and the bus voltages, underboth normal and abnormal systemconditions.Voltage Unbalance StudyVoltage flicker and poor voltageregulation are a common concern onsystems with large arc furnaces. Theexperts from Siemens use this study todevelop comprehensive solutions thatlimit the effects of voltage irregularitiesand protect sensitive equipment.Grounding StudyWith the goal of ensuring properprotection and reducing the possibility ofexcessive transient overvoltages duringline-to-ground faults, our engineers willdetermine and recommend the mostappropriate form of system groundingprotection (including solidstate, lowresistance, and high resistance).With power system expertise andexperience that comes from real-worldsuccesses, the specialized team ofprofessional engineers and certifiedtechnicians from Siemens will help you:▪ Minimize downtime▪ Improve the safety of your operationsfor employees and sub-contractors▪ Optimize your system’s performance▪ Extend your equipment’s life cycle▪ Reallocate your valuable internalmaintenance resources to your corebusiness▪ Maximize the protection of sensitiveelectronics▪ Ensure your facility complies withapplicable safety regulationsIn addition, the power system specialistsfrom Siemens also provide the following:Power System Studies on“Equipment Release for Manufacture”▪ To ensure adequate interrupting rating,and to ensure that coordinationcapabilities are recognizedStreamlined Power SystemConstruction Studies (PSCS)▪ For devices being installed onconstruction projects13 SWITCHGEARFor more information, please visit http://automation.usa.siemens.com/consultant/ or contact your local sales office.Siemens Power Distribution & Control, SPEEDFAX 2007-2008 Product Catalog 13-35