NetSim

Network simulator for relay testing under real life conditions

The NetSim test module is designed for commissioning engineers and routine testers who want to benefit from the advantages of power network simulations and testing with transient signals. Preconfigured network configurations – test cases – with a simple parameter setup allow instant “click and run” simulations and signal output with the CMC test set.

Application examples

• Relay testing under real-life conditions
• Evaluation of relay settings for difficult protection applications
• Testing of advanced protection algorithms
• Easy End-to-End testing of line protection with GPS or IRIG-B time synchronization
• Testing of differential protection including CT saturation

The transient voltages and currents are calculated from a digital network model, providing an optimal approximation of the real events in a power network. CT saturation may be simulated using real CT excitation and burden data for each measurement location. This data could, for example, be measured on site with the CT Analyzer.

Test cases

• Short circuit events on single lines, parallel lines (including mutual coupling), and three terminal lines
• Power swings
• Evolving double faults
• Series compensation capacitor bank
• Transformer for through-fault and bushing fault simulation
• Customized test cases (on request)

Event simulation

• Fault types L-N, L-L, L-L-N, L-L-L, L-L-L-N
• Selectable fault location
• Selectable fault resistance (arc simulation)
• Simultaneous faults on parallel lines
• Open phase
• Spur line
• Switch-onto-fault
• Power Swing

Further functions

• Automatic repetition of tests with varying parameters
• Impedance view including distance zones
• Additional COMTRADE export of simulated waveforms
• Output of the transient data of all measurement points as IEC 61850 Sampled Values and support of virtual binary GOOSE inputs and outputs

For the simulation of the power system all essential components and parameters are taken into account. This includes: voltage sources, lines (mutual coupling), transformer (vector group, core type and ratio), circuit breakers and CT saturation.