Protective device analysis

Protective device analysis module

Features

Time overcurrent plots are generated within the user-friendly interface of Eaton's CYME software, which offers:

• Log-log plot to display time-current curves of protective devices such as fuses, relays, circuit breakers and re-closers
• Library containing more than 100,000 curves from North American, European and Asian manufacturers (incl. IEEE/ANSI and CEI Standards)
• Online update of the library of curves
• User-defined curves
• Drag-and-drop equipment with specific settings onto the one-line diagram
• Unified control in the software showing all protective branches and providing quick access to commands such as display curves and branch device coordination
• Inspection of the proper coordination for motor starting, transformer inrush and cable damage
• Tools to calculate precisely the time and current margins between curves
• Modification of any setting to visualise the change interactively on-screen
• Customisable display options for curve colours, tags and other grid options
• Colour-coding of the one-line diagram with the protection level or the protection zone
• Export function to easily include time-current plots in reports

Not only does Eaton's CYME software provide the useful tools listed above to make any study simple, it also offers advanced analyses to assist engineers in examining the coordination and protection range of the devices on the network more closely.

Protective device analysis 

Protective device analysis can be used to verify the coordination, protective reach and loading of all protective devices in a network. Radial coordination and parallel branches coordination are supported.

Main capabilities include:

• Entire system analysed with one command
• Verify the coordination between successive pairs of devices according to user-defined criteria
• Examine whether a device operates for all faults in its protection zone within a user-defined maximum permitted operating time
• Compare the current through each device to a user-defined maximum permitted continuous load current
• Verify if cables are protected by a device on all its length
• Fuse-clearing or fuse-saving option
• Study both primary and secondary protective devices
• Compare the cold load pick-up current curve seen by a protective device to its time-current curve and report abnormal conditions
• Specialised report and indication on one-line diagram to highlight curve intersections, reach and loading problems

Minimum fault analysis

Minimum fault analysis is offered to assist engineers in the verification of whether the protective devices can adequately detect and clear the minimum faults seen in their respective protection zone.

A detailed report is provided to list all areas that are inadequately protected. Those areas are also colour-coded on the one-line diagram for easier visualisation.

Sequence of operation analysis

Sequence of operation analysis evaluates the impact of a temporary or permanent fault on the network to provide the sequence of protective device operations triggered.

Main capabilities include:

• User-defined fault location
• Simulation of any fault type
• Calculation of the fault current and opening time of each protective device while taking into account the state of the network at each operation
• Take into account device settings, including delays and reset times
• Tracing of the protective devices triggered in the one-line diagram
• Tabular report listing the sequence of devices triggered, the opening time and fault current detected at each operation