Extended Protection Simulation (SZ) Siemens PSS SINCAL Protection Modules

Extended Protection Simulation (SZ)

Requirements and Use Cases

Distance protection and differential protection devices are primarily used in meshed distribution networks and in transmission networks. Especially in meshed networks and networks with decentralized generation, effects occur, which change the reach of the protection devices. A simulative validation of the setting values is necessary in order to verify the setting of these protection devices. Primarily the following questions must be clarified here:

• Are faults being cleared selectively?
• How long does the network protection need to clear faults?
• Have the protection device parameters been set correctly regarding any load and short circuit currents?

The following is also required:

• Analysis of the changed reach of protection devices due to effects such as intermediate infeed or parallel follow-up lines (underreach/overreach)
• Post-mortem analysis of faults occurred in the network
• Analysis of the fault clearing process
• Creation of grading diagrams based on the setting values
• Documentation of the protection setting values
• Simulation of voltage and frequency protection, e.g. of decentral energy resources (DER)

Solution

The extended protection simulation (SZ) module in PSS®SINCAL extends the functionality of the overcurrent time protection simulation (OC) module. Here distance protection, differential protection, voltage protection and frequency protection device types are additionally supported. Beside the simulation of the behavior of the protection devices and the check of the protection setting values, additional analysis options are available, such as the calculation and display of the actual reach of protection devices.

• Extension of the protection simulation with distance and differential protection devices, voltage and frequency protection
• Stepwise event-oriented fault simulation including the calculation of fault clearing times
• Interactive analysis of the fault clearing process in the network graphic
• Verification of the setting values and checking for selective fault clearing
• Calculation and display of the reach of protection devices in the protection route calculation. Cascaded fault clearings, parallel line effects and intermediate infeeds (e.g. by decentral energy resources) are considered
• Diagrams showing the actual zone reaches of the protection devices for evaluating the tripping behavior (based on fault simulations)
• Post-mortem analysis, fault locater to analyze/locate faults that have occurred in the network

PSS®SINCAL Protection Modules

Tackle the complex field of protection with powerful simulations and visualizations, from protection coordination, validation, and calculation of settings, all the way to automated system-wide protection studies.

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