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Aerospace DefenseTop 10 Best Protection Relay Coordination Software of 2026
Ranked review of protection relay coordination software for engineers, comparing SKM Power*Tools, ETAP, DIgSILENT, plus Siemens PSS SINCAL.
How we ranked these tools
Core product claims cross-referenced against official documentation, changelogs, and independent technical reviews.
Analyzed video reviews and hundreds of written evaluations to capture real-world user experiences with each tool.
AI persona simulations modeled how different user types would experience each tool across common use cases and workflows.
Final rankings reviewed and approved by our editorial team with authority to override AI-generated scores based on domain expertise.
Score: Features 40% · Ease 30% · Value 30%
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Siemens PSS SINCAL is the best fit for protection teams that need repeatable relay coordination studies from network model to settings documentation, whereas MilSoft WindMil is a strong alternative when you focus on consistent feeder-level coordination outputs across revisions.
Editor’s top 3 picks
Three quick recommendations before you dive into the full comparison below — each one leads on a different dimension.
Siemens PSS SINCAL
One-line driven study objects link modeled system conditions to device coordination checks and exported settings packages.
Built for fits when protection teams need repeatable coordination studies from network model to settings documentation..
MilSoft WindMil
Editor pickTemplate-driven coordination studies that keep device settings and fault analysis assumptions consistent across iterations.
Built for fits when protection teams need repeatable feeder coordination studies with consistent settings outputs across revisions..
IPSA
Editor pickStudy-to-report pipeline that reuses the same relay configuration to regenerate coordination results for review packages.
Built for fits when teams run frequent coordination studies from stable relay libraries and need controlled reruns..
Comparison Table
Siemens PSS SINCAL
enterprisePower system planning software with protection analysis modules for relay coordination and fault calculation in transmission and distribution networks.
One-line driven study objects link modeled system conditions to device coordination checks and exported settings packages.
Siemens PSS SINCAL centers on a study workflow that starts with the electrical network model and leads to device-by-device coordination results for protective devices on a one-line diagram. The tool links protection objects and settings logic to modeled system conditions, which reduces manual mismatch between fault calculations and relay grading. Reporting output supports traceable settings tables and coordination plots for review cycles that require evidence of margins and timing relationships.
A tradeoff appears in workflow depth, because large studies depend on disciplined data setup for device objects, CT parameters, and network consistency. PSS SINCAL fits best when a team runs repeated coordination iterations for multiple buses or substations and needs structured settings outputs for engineering signoff.
- +Tight coupling between network fault calculations and relay coordination outputs
- +Structured settings outputs support consistent coordination documentation
- +Good coverage for coordination needs across multiple protection device types
- +Study workflow supports repeat runs for iterative engineering changes
- –Model and device data setup discipline is required for reliable results
- –Automation surface for external orchestration is narrower than code-first tools
- –Large models can slow interactive iteration during early studies
- –Specialized study configurations can require experienced settings knowledge
Utility protection engineers
Substation-wide relay grading iterations
Cleaner selective coordination evidence
Industrial power systems teams
Motor and transformer protection coordination
Reduced setting mismatch risk
Show 2 more scenarios
Consulting engineering groups
Multi-client coordination package generation
Faster repeat project cycles
Reuse study structures across projects to keep settings outputs consistent.
Operations planning analysts
Fault studies for network changes
Documented change impact
Update the network model and regenerate coordination results for new configurations.
Best for: Fits when protection teams need repeatable coordination studies from network model to settings documentation.
MilSoft WindMil
vertical specialistDistribution system analysis software with protective device coordination capabilities for utility distribution networks.
Template-driven coordination studies that keep device settings and fault analysis assumptions consistent across iterations.
WindMil targets protection engineers who need consistent coordination studies across multiple switching scenarios and device types, including overcurrent protection devices. The software’s workflow ties together network modeling, fault current analysis inputs, and relay setting configuration to produce coordination intervals and time dial settings outputs. Study templates help keep repeated runs aligned to the same engineering intent, which reduces rework when a one-line diagram changes.
A key tradeoff is that WindMil’s value depends on clean upstream model data such as consistent current transformer ratio definitions and correct device naming across one-line diagram changes. It fits best when a team runs many coordination iterations for feeders and substations and wants settings outputs that remain comparable from run to run.
- +Strong iterative workflow for coordination runs tied to one-line changes
- +Clear handling of inverse-time and definite-time coordination outputs
- +Settings and coordination results organized for engineering review
- +Repeatable study templates reduce rework across study revisions
- –Model data quality strongly affects coordination accuracy and consistency
- –Automation and integration surface is narrower than general-purpose analysis stacks
- –Complex studies can take longer to validate than smaller feeder projects
- –RBAC-style governance features are not as prominent as in enterprise admin suites
Protection engineers
Coordinating overcurrent relays for feeders
Faster review of coordination intervals
Utility studies teams
Batch study updates after topology changes
Comparable results across revisions
Show 2 more scenarios
Industrial power engineering
Coordination settings for substations
Reduced manual reconfiguration
The study workflow supports selecting relay time dial settings and verifying coordination against fault current scenarios.
Consulting protection firms
Delivering coordinated settings packages
More consistent deliverables
Structured outputs support review cycles and documentation for protection device settings and coordination intervals.
Best for: Fits when protection teams need repeatable feeder coordination studies with consistent settings outputs across revisions.
IPSA
vertical specialistPower network analysis software from TNEI that includes protection coordination and fault analysis capabilities.
Study-to-report pipeline that reuses the same relay configuration to regenerate coordination results for review packages.
IPSA supports protection coordination work by pairing electrical network fault analysis inputs with relay setting data so coordination can be calculated and compared across operating conditions. The workflow is built around setting parameter management and constraint checks that reduce manual recomputation when relay settings or device models change. Document generation is geared toward producing consistent outputs for coordination review rather than exporting raw data only.
A key tradeoff is workflow rigidity compared with tools that offer deeper customization of internal study logic, because coordination steps follow predefined calculation and report structures. IPSA fits best when a team repeatedly runs similar coordination studies from an established relay library and wants controlled reruns after model updates, such as feeder rebuilds or substation equipment changes.
- +Repeatable study workflow reduces manual coordination reruns
- +Parameter management keeps relay setting revisions traceable in outputs
- +Reporting generation fits coordination review and signoff cycles
- +Integration of fault inputs with device models supports iterative tuning
- –Limited internal customization compared with more extensible engineering tools
- –Best results require disciplined relay library and naming conventions
- –Some edge-case protection logic needs workaround modeling approaches
- –Large models can slow iteration during frequent rerun cycles
Protection engineering teams
Feeder overcurrent coordination for new substations
Faster signoff cycles
Utility protection groups
Rerun coordination after network model updates
Reduced rework effort
Show 1 more scenario
Consulting engineers
Multi-project relay settings standardization
More consistent deliverables
Consistent parameter handling helps maintain uniform device modeling across different customer projects.
Best for: Fits when teams run frequent coordination studies from stable relay libraries and need controlled reruns.
SKM Power*Tools
enterpriseElectrical engineering software suite whose PTW platform includes CAPTOR for protective device coordination and time-current curve plotting.
Built-in relay coordination workflow that iterates device settings and coordination checks directly against the study cases.
SKM Power*Tools is a protection relay coordination software package that focuses on producing coordinated protection settings from an electrical network model. It supports protective device studies and coordination checks tied to one-line diagram topology and fault current analysis inputs.
The workflow emphasizes relay settings outputs that engineers can map to time-current characteristics and coordination intervals for overcurrent protection applications. Integration depth is strongest when SKM’s own network and device libraries are used end to end.
- +Coordination studies link relay settings to coordination interval and selectivity checks.
- +Device modeling is practical for overcurrent protection and inverse-time characteristic workflows.
- +Report outputs are structured for review of protective device coordination and fault scenarios.
- +Exports fit engineering handoffs for further analysis and review.
- –Directional overcurrent and complex schemes need careful model setup to avoid misleading results.
- –Automation is limited compared with tools that provide deep API-driven study generation.
- –Large networks can slow down interactive studies when sweeping multiple settings cases.
- –Modeling discipline is required to keep CT saturation and fault current assumptions consistent.
Best for: Fits when protection engineers need repeatable coordination studies from one-line topology and device settings outputs.
EasyPower
enterprisePower system analysis software with an integrated protective device coordination module supporting automatic TCC curve generation and fuse-breaker selectivity.
Coordination checks generated directly from calculated fault currents and configured relay setting logic for selective coordination gaps.
EasyPower runs protection relay coordination studies by calculating fault currents from an electrical network model and then applying relay setting logic to produce coordination results. The workflow centers on building and maintaining one-line diagram network data for short-circuit study inputs, then generating time-current behavior for protective device coordination checks.
EasyPower also supports results review across multiple fault cases, including coordination interval and margin inspection for overcurrent protection schemes. For teams that need repeatable study runs, EasyPower emphasizes configuration reuse across cases instead of manual rework.
- +Fault-current based coordination flow ties relay settings to network model cases
- +Time-current characteristic curve handling matches common overcurrent study practice
- +Batch style re-running across fault cases supports repeatable coordination reviews
- +Results views make coordination interval and margin checks quick
- –Directional overcurrent protection workflows need careful element setup discipline
- –Advanced automation and external data integration depend on scripting workarounds
- –Complex mixed-technology studies can become configuration heavy
- –Large studies may require performance tuning in model size and case selection
Best for: Fits when utilities and EPC teams need repeatable overcurrent coordination studies from one-line network models.
DIgSILENT PowerFactory
enterpriseSiemens-owned power system analysis software with protection analysis functions for relay modeling, coordination checking, and fault studies.
Tight coupling between the electrical network model and time-current characteristic based coordination studies within one project workspace.
DIgSILENT PowerFactory is a power system modeling and protection study environment where network data feeds relay setting workflows through a unified electrical network model. It supports short-circuit study and protective device coordination with time-current characteristic curve evaluation, plus configurable device models for overcurrent protection and distance protection.
The tool is best suited to protection engineers who need repeatable analysis inputs from one-line diagram data through fault current analysis and relay setting outputs. Model reuse and automation via scripting are key differentiators for organizations that manage multiple studies across changing network topologies.
- +Unified network model drives protection studies and relay setting outputs consistently
- +Time-current characteristic curve based coordination supports multiple curves and device behaviors
- +Supports protection workflows that span overcurrent and distance protection models in one project
- +Scriptable study automation supports batch fault studies across many scenarios
- –Setup and data hygiene around terminal connectivity can delay first correct coordination results
- –Protection coordination tooling can feel heavy for engineers focused only on relay setting spreadsheets
- –Large models require careful performance management during iterative coordination runs
- –Automation depth depends on internal study objects and scripting familiarity
Best for: Fits when protection engineers need one modeling source of truth feeding coordination and settings at scale.
Paladin DesignBase
enterprisePower system analysis software that includes relay coordination and protection study functions.
Tight coupling between coordination study setup and imported network equipment data to support iterative re-study cycles.
Paladin DesignBase focuses on protection relay coordination workflows tied to electrical network models, not just settings reports. It supports protective device coordination studies using relay settings and time-current characteristic inputs, then produces coordination results that can be reviewed against target coordination intervals.
Integration depth centers on importing and using network and equipment data to keep changes traceable across iterations. Automation is largely driven by repeatable study configurations and batch-style project runs rather than scripting-first extensibility.
- +Workflow-oriented study configuration for repeatable coordination runs
- +Strong linkage between network data and resulting coordination checks
- +Clear handling of time dial setting and curve selection inputs
- +Outputs are geared toward coordination interval review cycles
- –Automation and API surface is limited for custom integrations
- –Advanced scenario management needs careful manual project structuring
Best for: Fits when protection engineers need repeatable coordination studies from an established network model.
NEPLAN
vertical specialistPower system analysis platform with a dedicated protection coordination module for relay setting and selectivity studies.
A coordination-focused study workflow that keeps relay setting results aligned with updated network data revisions.
NEPLAN is a protection relay coordination software focused on fault current analysis and protection setting studies on electrical network models. It supports workflow-driven coordination of time-current characteristics for overcurrent, transformer, busbar, and other protection cases through a one-line diagram model.
The tool also supports repeatable studies with automation-oriented configuration so engineers can rerun settings under updated network data and compare outcomes for selective coordination. NEPLAN’s distinct strength is how it ties relay setting calculations to network updates so coordination results remain consistent across study revisions.
- +Tight coupling between one-line network data and protection setting outcomes
- +Clear coordination workflow for time-current characteristic based relay studies
- +Good coverage for common protection study cases across distribution and industrial systems
- +Study reruns support consistent results when network model inputs change
- –Automation surface depends on study configuration rather than a generalized API approach
- –Directional, distance, and complex scheme modeling can require careful model setup discipline
- –Arc-flash incident energy and CT saturation handling are not as central to workflows as coordination
- –Large projects can feel slower when recalculating many protection scenarios
Best for: Fits when engineering teams need repeatable protection setting and coordination studies tied to changing one-line models.
pandapower
open sourceOpen source Python library for power system modeling with a protection module supporting relay coordination calculations.
Tight Python automation that keeps network model, study execution, and relay-setting calculations in one configurable codebase.
pandapower generates an electrical network model and then runs power flow and short-circuit study workflows that feed protective engineering checks. It supports time-current characteristic curve based device modeling and can evaluate coordination settings across protective devices in a reproducible, scriptable pipeline. The project emphasizes Python extensibility, so custom relay-setting calculations and batch studies run inside the same automation harness rather than in a separate GUI export cycle.
- +Python-first workflow enables batch coordination studies and custom relay logic
- +Network models and study inputs stay consistent across iterative revisions
- +Time-current characteristic curve handling supports inverse-time and definite-time behavior
- +Exportable results integrate with other engineering scripts and notebooks
- –Protection relay coordination interval and sequence-dependent logic need custom modeling
- –GUI-based, engineer-paced coordination editing is limited compared with dedicated tools
- –Large systems can become slow without careful batching and solver settings
- –IEC 60255 compliance checks require explicit enforcement in the study code
Best for: Fits when coordination studies run as repeatable Python pipelines with custom device logic and batch reporting.
PSCAD
enterpriseElectromagnetic transient simulation tool from Manitoba HVDC Research Centre used for detailed relay model testing.
Electromagnetic transient modeling that represents non-ideal device behavior and produces waveform-based evidence for relay coordination.
PSCAD is a simulation-first protection coordination workflow built around detailed electromagnetic and component-level modeling that many coordination tools do not replicate. It supports engineering-grade electrical network modeling and time-domain studies to derive fault behavior for relay settings and coordination intervals.
PSCAD is most useful when coordination work depends on system physics like saturation effects, non-ideal transformer behavior, and waveform-driven decisions. It also supports integration into repeatable studies through scriptable runs and model parameterization for large scenario sets.
- +Time-domain electromagnetic modeling feeds relay setting decisions with waveform accuracy
- +Component-level transformer and CT saturation effects can be represented in studies
- +Scenario parameterization supports repeatable fault current analysis runs
- +Model-driven workflow keeps study assumptions attached to the simulation
- –Protection coordination automation for relay settings is less direct than dedicated tools
- –Maintaining large models can become administratively heavy across teams
- –Results extraction into coordination reports needs manual or custom tooling
- –Long simulation times can constrain high-throughput screening studies
Best for: Fits when coordination depends on time-domain fault waveforms and device physics beyond steady-state studies.
Conclusion
After evaluating 10 aerospace defense, Siemens PSS SINCAL stands out as our overall top pick — it scored highest across our combined criteria of features, ease of use, and value, which is why it sits at #1 in the rankings above.
Use the comparison table and detailed reviews above to validate the fit against your own requirements before committing to a tool.
How to Choose the Right protection relay coordination software
Protection relay coordination software turns a short-circuit study workflow into repeatable selective coordination checks and relay settings outputs. This guide covers SKM Power*Tools, ETAP, DIgSILENT PowerFactory, and the broader set of reviewed tools including Siemens PSS SINCAL, MilSoft WindMil, and IPSA.
The coverage emphasizes how each tool links one-line or network model changes to coordination interval results and exported settings documentation. It also highlights which products support controlled reruns, which ones rely on study configuration discipline, and which ones offer an integration or automation surface for engineering teams.
Protection relay coordination software for selective coordination checks and relay settings package generation
Protection relay coordination software manages the workflow that maps electrical network model conditions to protective device coordination checks, then generates relay settings outputs that remain consistent across study revisions. Siemens PSS SINCAL is built around one-line driven study objects that connect modeled system conditions to coordination checks and exported settings packages.
SKM Power*Tools emphasizes an in-tool coordination workflow that iterates device settings against study cases, and it links coordination results to selectivity checks through a settings-driven engineering loop. Tools like DIgSILENT PowerFactory keep the electrical network model and time-current characteristic based coordination work inside one project workspace, which supports scaling coordination studies from a single modeling source.
Coordination-to-settings traceability, automation surface, and study repeatability
Protection relay coordination software earns credibility when coordination checks stay traceable to relay settings outputs across study revisions. The strongest tools connect one-line or network model changes to coordination interval results and produce settings packages that match the same underlying assumptions.
Model-to-coordination-to-settings linkage
Siemens PSS SINCAL connects one-line driven study objects to coordination checks and exported settings packages. DIgSILENT PowerFactory keeps the electrical network model and time-current characteristic coordination work inside one project workspace for consistent settings outputs.
Repeatable reruns from reusable study configuration
IPSA builds a study-to-report pipeline that reuses the same relay configuration to regenerate coordination results for review packages. MilSoft WindMil uses template-driven coordination studies to keep device settings and fault analysis assumptions consistent across iterations.
In-tool coordination workflow tied to study cases
SKM Power*Tools iterates device settings and coordination checks directly against study cases. EasyPower generates coordination checks from calculated fault currents and configured relay setting logic for selective coordination gaps.
Automation and batch execution philosophy
pandapower provides a Python-first workflow that keeps network models, study execution, and relay-setting calculations in one configurable codebase. PSCAD focuses on electromagnetic transient modeling that feeds relay setting decisions with waveform evidence, which changes the automation profile for coordination runs.
Pick the workflow shape that matches coordination iteration and integration needs
Tool selection should start with how coordination studies get produced repeatedly, then move to how automation and integration requirements fit the workflow. The key fork is whether the organization wants coordination embedded as a study workflow, or whether it wants coordination run logic anchored in templates, a relay library rerun pipeline, or code automation.
Choose the data linkage model: exported settings vs project workspace vs codebase
If coordination needs tight one-line driven traceability to exported settings packages, Siemens PSS SINCAL matches that linkage workflow. If a single project workspace should drive both network modeling and time-current characteristic based coordination, DIgSILENT PowerFactory aligns to the workspace-first approach.
Select for rerun control: templates, relay library reruns, or iterative in-tool loops
If repeatability depends on holding fault assumptions and device settings constant across revisions, MilSoft WindMil’s template-driven studies reduce drift between runs. If repeatability depends on reusing a relay configuration to regenerate coordination results for review packages, IPSA’s study-to-report pipeline fits that governance style.
Decide how coordination checks get generated: settings-driven iteration vs fault-current generation
If coordination interval and selectivity checks must be tied to an in-tool loop that iterates relay settings against study cases, SKM Power*Tools supports that settings-driven engineering loop. If coordination checks should come directly from fault-current based logic that targets gaps in selective coordination, EasyPower supports a fault-current generated workflow.
Match the automation surface to batch needs and custom device logic
If coordination work must run as repeatable Python pipelines with custom relay logic and batch reporting, pandapower offers the codebase-first automation shape. If coordination evidence depends on time-domain electromagnetic waveforms and component-level transformer and CT saturation effects, PSCAD fits the waveform-driven modeling philosophy.
Account for scenario management and external integration constraints
If imported network equipment data must be tightly tied to iterative re-study cycles with coordination workflow setup, Paladin DesignBase supports that study configuration coupling. If directional, distance, or complex schemes require careful model setup with a coordination-focused workflow, NEPLAN’s automation surface depends more on study configuration than a generalized API approach.
Protection teams that need coordination traceability, repeatability, or automation
Different protection organizations optimize for different failure modes, such as drift between revisions, inconsistent assumptions between runs, or lack of automation for large feeder sets. These tools map to those realities based on how they connect network model inputs to coordination checks and settings outputs.
Protection engineers running coordination updates from frequent one-line topology changes
Siemens PSS SINCAL links one-line driven study objects to coordination checks and exported settings packages, which supports traceable outputs after network changes. DIgSILENT PowerFactory keeps the electrical network model and coordination within one project workspace for consistent time-current characteristic based outputs.
Teams that regenerate coordination reports from stable relay libraries and need controlled reruns
IPSA reuses the same relay configuration to regenerate coordination results for review packages. MilSoft WindMil uses template-driven coordination studies to keep device settings and fault analysis assumptions consistent across iterations.
Utilities and EPC teams standardizing feeder coordination logic across network model cases
EasyPower generates coordination checks from calculated fault currents and configured relay setting logic, which fits standardized overcurrent coordination workflows. SKM Power*Tools provides an in-tool coordination workflow that iterates device settings directly against study cases for repeatable coordination runs.
Engineers building custom automation around relay setting calculations and batch reporting
pandapower supports Python-first orchestration where the network model and relay-setting calculations stay in one configurable codebase. PSCAD supports waveform evidence through electromagnetic transient modeling when coordination decisions require non-ideal device behavior representation.
Coordination errors that come from setup discipline, data hygiene, and workflow mismatch
Coordination failures usually come from a mismatch between the tool’s coordination workflow and the engineering assumptions used to build the study inputs. Several tools explicitly require disciplined model setup to avoid misleading coordination outputs, especially when the study scope includes directional elements or terminal connectivity details.
Treating coordination results as independent of model setup quality
MilSoft WindMil and NEPLAN both tie coordination accuracy to study configuration and data quality, so incorrect one-line or network inputs propagate into coordination outputs. Build a repeatable model check step before generating time-current based coordination results.
Assuming directional or complex scheme coordination will work without careful element modeling
SKM Power*Tools requires careful model setup for directional overcurrent and complex schemes to avoid misleading results. EasyPower also needs careful element setup discipline for directional overcurrent protection workflows.
Delaying first-correct results due to connectivity and terminal data hygiene issues
DIgSILENT PowerFactory can delay first correct coordination results when terminal connectivity and data hygiene are not set up cleanly. Plan a connectivity validation pass early in the project workspace to reduce iteration churn.
Choosing a waveform-based modeling approach when the project needs direct relay settings automation
PSCAD provides electromagnetic transient modeling evidence for coordination decisions, but protection coordination automation for relay settings is less direct than dedicated coordination tools. Use PSCAD when device physics and time-domain evidence are part of the coordination acceptance criteria.
How We Selected and Ranked These Tools
We evaluated protection relay coordination workflows by scoring features at 40% and ease plus value at 30% each. Siemens PSS SINCAL separated itself with one-line driven study objects that link modeled system conditions to coordination checks and exported settings packages, which directly supports traceable coordination-to-settings output.
DIgSILENT PowerFactory scored lower because setup and data hygiene around terminal connectivity can delay first correct coordination results, even though its project workspace keeps network modeling and time-current characteristic based coordination aligned. SKM Power*Tools scored lower than the top tool due to limited automation compared with tools that provide deep API-driven study generation, even though it offers an in-tool coordination workflow that ties relay settings to coordination interval and selectivity checks.
Frequently Asked Questions About protection relay coordination software
How do SKM Power*Tools, ETAP, and DIgSILENT PowerFactory differ in how relay coordination ties back to the network model?
Which tools produce coordination results suitable for selective coordination reviews across many fault cases without manual rework?
How does DIgSILENT PowerFactory handle different protection categories like overcurrent and distance within a single workflow?
What breaks if a protection team updates the one-line diagram model but reruns coordination without a controlled study configuration?
When does IEC coordination output depend on configuration discipline, not just fault-current magnitude?
How do pandapower and PSCAD differ when coordination depends on waveform-driven behavior instead of steady-state fault currents?
What integration and API expectations usually separate DIgSILENT PowerFactory and pandapower for automation-heavy engineering teams?
How do ETAP and MilSoft WindMil support structured outputs for engineering review without losing traceability between study assumptions and settings?
What tradeoff appears when a tool is tightly coupled to one-line driven coordination versus a scriptable pipeline approach?
Tools reviewed
Primary sources checked during evaluation.
Referenced in the comparison table and product reviews above.
- Aerospace DefenseTop 10 Best Defense Engineering Services of 2026
- SecurityTop 10 Best Cyber Protection Services of 2026
- Aerospace DefenseTop 10 Best Defense Software of 2026
- Telecommunications ConnectivityTop 10 Best Distribution Relay Software of 2026
- Business FinanceTop 10 Best Project Coordination Software of 2026
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