Protection Security Assessment
Data aggregation and in-depth analysis
Protection systems are crucial for system security because they limit the impact that faults have on power systems. Continuously evolving power systems and quickly changing operating conditions make it a complex task to calculate, verify, and validate protection settings. Rigorous protection security assessment that takes into account all relevant network, operating, and fault conditions is required to review the adequacy of protection settings. Such protection security assessments should be carried out in regular intervals and only automated solutions can manage them efficiently.SIGUARD PSA enables protection engineers and operators to perform fast protection security assessments for reliable protection-setting determination, secure system operation, and of cascading trippings prevention.The solution includes customization for application in planning, operation, and training. Protection system audits and certification are offered as consulting services.
Simulation & performance assessmentClassical protection coordination methods mainly rely on the depiction of setting values, short-circuit currents and network impedances for one operating state. In contrast, SIGUARD® PSA uses combined power and protection system simulation and assesses the performance of the protection system by visualizing real selectivity. This comprehensive consideration of the complete protection system, consisting of main protection and back-up protection, initially allows the detection of hidden errors for all possible network and fault scenarios.As required, the results can be represented aggregated for complete network areas or detailed for each protection object or equipment. The usage of color-coding facilitates the identification of incorrect settings, weaknesses and limitations of protection system. If necessary, each step of fault clearing sequence can be analyzed in detail. All currents, voltages and impedances measured by protection devices are reported and explain the protection system behavior.SIGUARD® PSA assesses a large number of fault scenarios systematically and efficiently. Its clear result visualization allows the precise identification of weaknesses and their reasons in the protection system.Protection system improvementFalse or improvable settings can be corrected rule-based. Alternatively also system-wide optimizations of the protection settings are possible. In order to assure quality new protection settings are verified via simulation before approval. In case where no selective protection grading can be achieved with improved settings, it is clearly indicated that an adjustment of the protection scheme is necessary.Practical applicationIn practical application the first step comprises the construction of a quality tested data base which is then digitally available after first-time application of SIGUARD® PSA. Through the protection performance assessment of the local system current weaknesses and limitations of the protection systems are indicated. In order to ensure reliable network operation these weaknesses have to be rectified. This is likewise supported by SIGUARD® PSA. Optimized and verified by simulation this protection system is the basis for the regular adjustment to future network extension. Thus, for example in the con-text of the integration of renewable energy it is possible to forecast how long the current protection system is able to satisfy the requirements in regard to selectivity or when a new concept has to be created.
SIGUARD® PSA enables protection engineers and operators to perform fast protection security assessments for reliable protection-setting determination, secure system operation, and of cascading trippings prevention.
SIGUARD® PSA offers a comprehensive protection security solution that comprises:
Network and protection data management (including data collection and update)
Network and protection simulation
Protection security assessment, such as the detection of non-selectivity and of hidden as well as critical faults
Concise and detailed depiction of protection system performance by fingerprint analysis
Online result visualization and documentation
Protection setting improvement and verification
Identification of incorrect settings and limitations of the protection system
Quality comparison of protection system performance with regard to different set-tings and network states for selected equipment and entire network areas
Scalability and customization to specific needs
Easy interpretation of the results due to practice-proven operation and visualization concepts
The main benefits of working with SIGUARD® PSA are:
Relief from time-consuming simulation tasks
Significant time and cost savings through a systematic and reliable implementation of comprehensive protection performance assessment
Prevention of avoidable supply interruptions
Improvement of the protection system performance
Adaptive settings can help to increase the network utilization
Consistent application of plausibility checks assures highest achievable standards of data quality
Data import from other IT systems leads to synergies by using existing data resources
Power system model can also be used for other power system studies such as distributed generation grid code compliance, harmonics, etc.
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