The Coordination Study determines the proper selection and short circuit ratings of protective devices. It includes protective settings to prevent damage to cables and electrical equipment, and setting adjustments to isolate and interrupt fault currents while maintaining service continuity for unaffected portions of the system. The design application and selection of breakers can verify to satisfy the mutually contradictory objectives and requirements for selectivity and system protection.
Studies provided for electrical power systems including utility, industrial, commercial, data centers, manufacturing, and water treatment. Reports include Time Current Characteristic Curves, associated online drawings with protective device settings, and commentary to describe the as-found settings and conditions, and recommendations to correct deficiencies.
- Coordinate Protective Device
- Simulate Sequential Protection
- Identify System Deficiencies
- Design Safer Power Systems
- Validate System Changes
- Custom Datablock Reports
- Project File Maintenance
A secondary goal of a coordination study is to minimize the potential for damage to the system or a subsequent fire to the facility due to arcing faults. This objective often goes unnoticed and is reflected in the fact that some protective devices settings do not consider the possibility of high-impedance or ground faults and fail to protect for the possibility of such damage. The energy in an arcing fault should be limited to less than 10 Megawatt-cycles, (on a 480 volt system) to prevent the arc from burning through equipment enclosure. A graphical method of determining the "go" or "no-go" limits of arc energy has been developed and is used to assure that ground fault protection and circuit breakers are set correctly. The short-circuit study determines the magnitude of fault currents for consideration. For this reason, it is usually advantageous to provide both the Short Circuit and Coordination Study together.