DC analysis

DC analysis module

DC modelling

Eaton's CYME software supports the modelling of DC auxiliary power systems (loss of AC power) and of industrial installations with DC equipment and processes.

The CYME equipment library includes DC equipment such as station batteries, chargers, uninterruptable power supplies (UPS) and DC/DC converters.

In addition, DC versions of the following components are included in the library: cables, impedance branches, protective devices, loads and machines. The user can build any DC network with all the necessary network components.

The DC network can be connected to the AC system through a battery charger or a UPS. Load flow and short-circuit analyses can be executed on the DC network or on the entire system, including the AC network.

The voltage and current distortion resulting from the connection of the charger and/or the UPS to the AC network can be studied with the Harmonic Analysis module.

The harmonic content can be entered as per the equipment manufacturer data sheets.

DC short-circuit analysis

The DC Short-Circuit Analysis module is dedicated to calculating fault levels in DC networks and systems.

• Fault analysis on all network buses and nodes
• Fault analysis at user-defined locations
• System-wide fault current and voltage profiles
• Automated sliding fault option on DC cables
• Option to include or not include contributions from DC equipment
• Machine current contribution reports
• Pre-fault nominal or DC load flow voltage profiles
• Fault current security factor for minimum and maximum fault studies

DC load flow analysis

The DC Load Flow Analysis module supports the steady-state analysis of the any DC systems under various operating conditions.

The solution algorithm is the full Newton Raphson, with or without constraints, using sparse matrix/vector methods.

Features of the DC Load Flow Analysis module include:

• Embedded maximum output current, reverse power flow detection and control
• Automatic update of the loading of chargers and UPSs on the AC system
• Customer load model library manager for any type, including constant power, current, impedance, composite and voltage sensitivity exponent model
• Load and motor scaling factors
• Five limit categories for nominal, planning, emergency or any user-defined loading criteria
• Abnormal conditions colour-coding on the network one-line diagram, as per user-defined criteria