Solid-State Transformers Vs Variable-Frequency: Usage Contexts
APR 20, 20269 MIN READ
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SST vs VFD Technology Background and Objectives
The evolution of power electronics has witnessed two distinct yet complementary technological pathways: Solid-State Transformers (SSTs) and Variable-Frequency Drives (VFDs). Both technologies emerged from the fundamental need to enhance power conversion efficiency and control capabilities in electrical systems, yet they have developed along different trajectories to address specific industrial and grid-level challenges.
SST technology represents a revolutionary approach to traditional electromagnetic transformers, integrating power electronics, high-frequency transformers, and advanced control systems into a single compact unit. The development of SSTs has been driven by the increasing demand for smart grid applications, renewable energy integration, and the need for bidirectional power flow control. Early research in the 1970s laid the groundwork for power electronic transformers, but significant advancement occurred in the 2000s with the availability of wide-bandgap semiconductors such as Silicon Carbide (SiC) and Gallium Nitride (GaN).
VFD technology, conversely, has followed a more mature development path, originating in the 1960s with the advent of thyristor-based motor control systems. The primary objective of VFDs has been to provide precise speed and torque control for AC motors while achieving significant energy savings. The technology has evolved through multiple generations, from six-step inverters to modern pulse-width modulation (PWM) systems with sophisticated control algorithms.
The convergence of these technologies in modern applications reflects the industry's pursuit of comprehensive power management solutions. SSTs excel in grid-level applications requiring voltage regulation, power quality improvement, and multi-port connectivity, while VFDs dominate motor control applications across industrial processes. The technological objectives for SSTs focus on achieving higher power density, improved reliability, and enhanced grid integration capabilities. Meanwhile, VFD objectives center on maximizing motor efficiency, reducing harmonic distortion, and providing advanced motor protection features.
Current research initiatives aim to bridge the gap between these technologies, exploring hybrid solutions that combine the grid-interface capabilities of SSTs with the motor control expertise of VFDs. This convergence is particularly relevant in applications such as electric vehicle charging infrastructure, renewable energy systems, and industrial microgrids where both grid interaction and motor control functionalities are essential.
SST technology represents a revolutionary approach to traditional electromagnetic transformers, integrating power electronics, high-frequency transformers, and advanced control systems into a single compact unit. The development of SSTs has been driven by the increasing demand for smart grid applications, renewable energy integration, and the need for bidirectional power flow control. Early research in the 1970s laid the groundwork for power electronic transformers, but significant advancement occurred in the 2000s with the availability of wide-bandgap semiconductors such as Silicon Carbide (SiC) and Gallium Nitride (GaN).
VFD technology, conversely, has followed a more mature development path, originating in the 1960s with the advent of thyristor-based motor control systems. The primary objective of VFDs has been to provide precise speed and torque control for AC motors while achieving significant energy savings. The technology has evolved through multiple generations, from six-step inverters to modern pulse-width modulation (PWM) systems with sophisticated control algorithms.
The convergence of these technologies in modern applications reflects the industry's pursuit of comprehensive power management solutions. SSTs excel in grid-level applications requiring voltage regulation, power quality improvement, and multi-port connectivity, while VFDs dominate motor control applications across industrial processes. The technological objectives for SSTs focus on achieving higher power density, improved reliability, and enhanced grid integration capabilities. Meanwhile, VFD objectives center on maximizing motor efficiency, reducing harmonic distortion, and providing advanced motor protection features.
Current research initiatives aim to bridge the gap between these technologies, exploring hybrid solutions that combine the grid-interface capabilities of SSTs with the motor control expertise of VFDs. This convergence is particularly relevant in applications such as electric vehicle charging infrastructure, renewable energy systems, and industrial microgrids where both grid interaction and motor control functionalities are essential.
Market Demand Analysis for Power Conversion Solutions
The global power conversion solutions market is experiencing unprecedented growth driven by the accelerating transition toward renewable energy systems and the increasing demand for energy-efficient technologies. Traditional power conversion methods are facing significant challenges in meeting the evolving requirements of modern electrical infrastructure, particularly in applications requiring high power density, improved efficiency, and enhanced controllability.
Solid-state transformers represent a revolutionary approach to power conversion, addressing critical market needs in smart grid applications, renewable energy integration, and industrial automation. The demand for SSTs is primarily driven by their ability to provide bidirectional power flow, voltage regulation, and power quality enhancement capabilities that conventional transformers cannot deliver. Electric vehicle charging infrastructure, data centers, and renewable energy installations are emerging as key application segments where SSTs demonstrate superior performance characteristics.
Variable-frequency drives continue to dominate the motor control and industrial automation sectors, with established market presence in manufacturing, HVAC systems, and process industries. The mature technology offers proven reliability and cost-effectiveness for applications requiring precise speed control and energy optimization. Market demand remains strong in developing economies where industrial expansion drives the need for efficient motor control solutions.
The convergence of digitalization and electrification is reshaping market requirements, with customers increasingly seeking integrated solutions that combine power conversion with advanced monitoring and control capabilities. Smart manufacturing initiatives and Industry 4.0 implementations are creating demand for power conversion systems that can seamlessly integrate with digital control networks and provide real-time operational data.
Regional market dynamics reveal distinct preferences based on infrastructure development stages and regulatory frameworks. Developed markets show growing interest in advanced solid-state solutions for grid modernization projects, while emerging markets maintain strong demand for cost-effective variable-frequency solutions to support industrial growth.
The market is also witnessing increased emphasis on sustainability and carbon footprint reduction, driving demand for power conversion solutions that maximize energy efficiency and enable renewable energy integration. This trend particularly favors technologies that can adapt to variable power sources and provide grid stabilization capabilities.
Solid-state transformers represent a revolutionary approach to power conversion, addressing critical market needs in smart grid applications, renewable energy integration, and industrial automation. The demand for SSTs is primarily driven by their ability to provide bidirectional power flow, voltage regulation, and power quality enhancement capabilities that conventional transformers cannot deliver. Electric vehicle charging infrastructure, data centers, and renewable energy installations are emerging as key application segments where SSTs demonstrate superior performance characteristics.
Variable-frequency drives continue to dominate the motor control and industrial automation sectors, with established market presence in manufacturing, HVAC systems, and process industries. The mature technology offers proven reliability and cost-effectiveness for applications requiring precise speed control and energy optimization. Market demand remains strong in developing economies where industrial expansion drives the need for efficient motor control solutions.
The convergence of digitalization and electrification is reshaping market requirements, with customers increasingly seeking integrated solutions that combine power conversion with advanced monitoring and control capabilities. Smart manufacturing initiatives and Industry 4.0 implementations are creating demand for power conversion systems that can seamlessly integrate with digital control networks and provide real-time operational data.
Regional market dynamics reveal distinct preferences based on infrastructure development stages and regulatory frameworks. Developed markets show growing interest in advanced solid-state solutions for grid modernization projects, while emerging markets maintain strong demand for cost-effective variable-frequency solutions to support industrial growth.
The market is also witnessing increased emphasis on sustainability and carbon footprint reduction, driving demand for power conversion solutions that maximize energy efficiency and enable renewable energy integration. This trend particularly favors technologies that can adapt to variable power sources and provide grid stabilization capabilities.
Current Status and Challenges of SST and VFD Technologies
Solid-State Transformers represent an emerging technology that integrates power electronics with traditional transformer functionality, enabling bidirectional power flow, voltage regulation, and grid interface capabilities. Current SST implementations primarily utilize silicon-based semiconductors, though silicon carbide and gallium nitride devices are increasingly adopted for higher efficiency and power density. The technology has achieved commercial viability in specific applications such as railway traction systems and renewable energy integration, with power ratings ranging from several kilowatts to megawatts.
Variable-Frequency Drive technology has reached technological maturity across multiple market segments, with widespread deployment in industrial motor control applications. Modern VFD systems incorporate advanced control algorithms including vector control and direct torque control, achieving motor efficiency improvements of 20-50% compared to traditional fixed-speed operations. The technology spans from fractional horsepower residential applications to multi-megawatt industrial installations, with established supply chains and standardized manufacturing processes.
SST technology faces significant technical challenges including semiconductor reliability under high-voltage stress, thermal management complexity, and electromagnetic interference mitigation. The multi-stage power conversion architecture introduces additional failure points compared to conventional transformers, while the control system complexity requires sophisticated fault detection and protection mechanisms. Manufacturing costs remain substantially higher than traditional alternatives, limiting widespread adoption despite superior functional capabilities.
VFD systems encounter challenges primarily related to harmonic distortion, motor bearing currents, and electromagnetic compatibility in sensitive environments. Power quality issues arise from the switching nature of power electronics, requiring additional filtering and mitigation strategies. Long motor cable runs can cause voltage reflection phenomena, potentially damaging motor insulation. Additionally, cybersecurity concerns have emerged as VFDs increasingly incorporate network connectivity and remote monitoring capabilities.
Both technologies face common challenges in power semiconductor device limitations, particularly regarding switching losses, thermal cycling stress, and electromagnetic interference generation. The integration of advanced materials and wide-bandgap semiconductors presents opportunities for performance enhancement but introduces new reliability considerations and manufacturing complexities that require continued research and development efforts.
Variable-Frequency Drive technology has reached technological maturity across multiple market segments, with widespread deployment in industrial motor control applications. Modern VFD systems incorporate advanced control algorithms including vector control and direct torque control, achieving motor efficiency improvements of 20-50% compared to traditional fixed-speed operations. The technology spans from fractional horsepower residential applications to multi-megawatt industrial installations, with established supply chains and standardized manufacturing processes.
SST technology faces significant technical challenges including semiconductor reliability under high-voltage stress, thermal management complexity, and electromagnetic interference mitigation. The multi-stage power conversion architecture introduces additional failure points compared to conventional transformers, while the control system complexity requires sophisticated fault detection and protection mechanisms. Manufacturing costs remain substantially higher than traditional alternatives, limiting widespread adoption despite superior functional capabilities.
VFD systems encounter challenges primarily related to harmonic distortion, motor bearing currents, and electromagnetic compatibility in sensitive environments. Power quality issues arise from the switching nature of power electronics, requiring additional filtering and mitigation strategies. Long motor cable runs can cause voltage reflection phenomena, potentially damaging motor insulation. Additionally, cybersecurity concerns have emerged as VFDs increasingly incorporate network connectivity and remote monitoring capabilities.
Both technologies face common challenges in power semiconductor device limitations, particularly regarding switching losses, thermal cycling stress, and electromagnetic interference generation. The integration of advanced materials and wide-bandgap semiconductors presents opportunities for performance enhancement but introduces new reliability considerations and manufacturing complexities that require continued research and development efforts.
Current Technical Solutions for Power Conversion
01 Integration of solid-state transformers with variable-frequency drive systems
Solid-state transformers can be integrated with variable-frequency drive systems to provide improved power conversion and control capabilities. This integration enables efficient voltage transformation and frequency modulation in a single compact system, reducing the need for separate components. The combination allows for better power quality management, reduced harmonic distortion, and enhanced system reliability in industrial and commercial applications.- Integration of solid-state transformers with variable-frequency drive systems: Solid-state transformers can be integrated with variable-frequency drive systems to provide improved power conversion and control capabilities. This integration enables efficient voltage transformation and frequency modulation in a single system, reducing the need for multiple conversion stages. The combination allows for better power quality management and enhanced system performance in industrial and commercial applications.
- Power conversion topologies for solid-state transformers in motor drive applications: Various power conversion topologies can be employed in solid-state transformers specifically designed for motor drive applications. These topologies utilize semiconductor switching devices to achieve voltage transformation and frequency control simultaneously. The designs focus on optimizing efficiency, reducing harmonic distortion, and improving dynamic response for variable-speed motor control applications.
- Control methods for coordinated operation of solid-state transformers and frequency converters: Advanced control algorithms enable coordinated operation between solid-state transformers and frequency converters to optimize system performance. These methods include synchronization techniques, voltage regulation strategies, and power flow management to ensure stable operation across varying load conditions. The control approaches address challenges such as voltage balancing, harmonic mitigation, and fault protection in integrated systems.
- Modular multilevel converter architectures for solid-state transformer applications: Modular multilevel converter architectures provide scalable solutions for solid-state transformer implementations in variable-frequency drive systems. These architectures utilize cascaded converter modules to achieve high voltage levels and improved power quality. The modular approach offers advantages in terms of redundancy, fault tolerance, and ease of maintenance while enabling flexible voltage and frequency control.
- Thermal management and protection schemes for solid-state transformer drive systems: Effective thermal management and protection schemes are essential for reliable operation of solid-state transformer-based drive systems. These solutions include advanced cooling techniques, temperature monitoring systems, and fault detection mechanisms to prevent overheating and component failure. Protection strategies encompass overcurrent protection, overvoltage protection, and short-circuit protection to ensure safe operation under various operating conditions.
02 Power conversion topologies for solid-state transformers in motor drive applications
Various power conversion topologies can be employed in solid-state transformers specifically designed for motor drive applications. These topologies utilize advanced semiconductor switching devices to achieve high-frequency operation and improved efficiency. The designs incorporate multiple conversion stages that enable precise control of voltage and frequency output, making them suitable for variable-speed motor control applications.Expand Specific Solutions03 Control methods for coordinated operation of solid-state transformers and variable-frequency drives
Advanced control algorithms and methods enable coordinated operation between solid-state transformers and variable-frequency drives. These control strategies optimize power flow, minimize losses, and ensure stable operation across varying load conditions. The control systems incorporate feedback mechanisms and real-time monitoring to adjust operating parameters dynamically, improving overall system performance and energy efficiency.Expand Specific Solutions04 Modular and scalable architectures for solid-state transformer-based drive systems
Modular design approaches allow for scalable solid-state transformer systems that can be adapted to different power ratings and application requirements. These architectures feature building-block configurations that can be connected in series or parallel to achieve desired voltage and current levels. The modular approach facilitates easier maintenance, redundancy implementation, and system expansion while maintaining high reliability and performance.Expand Specific Solutions05 Thermal management and protection schemes for high-power solid-state transformer drives
Effective thermal management solutions are critical for solid-state transformers operating in variable-frequency drive applications. These systems incorporate advanced cooling techniques, heat dissipation structures, and temperature monitoring to ensure reliable operation under high-power conditions. Protection schemes include overcurrent detection, overvoltage protection, and fault isolation mechanisms that safeguard both the solid-state transformer and connected drive equipment from damage.Expand Specific Solutions
Major Players in SST and VFD Industry
The solid-state transformers versus variable-frequency drives market represents an evolving competitive landscape characterized by technological convergence and diverse application contexts. The industry is transitioning from traditional electromagnetic solutions toward advanced power electronics, with market growth driven by electrification trends and smart grid initiatives. Key players demonstrate varying technological maturity levels, with established giants like ABB Ltd., Siemens AG, and Delta Electronics leading in both domains through comprehensive power conversion portfolios. Chinese companies including Huawei Digital Power Technologies and State Grid Corp. of China are rapidly advancing, particularly in grid-scale applications. Emerging specialists like Innomotics GmbH focus on targeted solutions, while research institutions such as Xi'an Jiaotong University and Georgia Tech Research Corp. drive innovation. The competitive dynamics reflect a maturing market where traditional boundaries between transformer and drive technologies are blurring, creating opportunities for integrated power management solutions across industrial, renewable energy, and transportation sectors.
ABB Ltd.
Technical Solution: ABB has developed comprehensive solid-state transformer solutions featuring advanced silicon carbide (SiC) semiconductor technology for medium voltage applications. Their SST systems integrate power conversion, voltage regulation, and grid interface functions in a single compact unit, offering bidirectional power flow capabilities and enhanced grid stability. The technology incorporates modular design architecture enabling scalable power ratings from 1MW to 10MW, with efficiency levels exceeding 96%. ABB's SST solutions are particularly optimized for renewable energy integration, electric vehicle charging infrastructure, and smart grid applications, providing real-time power quality monitoring and fault isolation capabilities.
Strengths: High efficiency, modular scalability, proven industrial track record. Weaknesses: Higher initial cost compared to conventional transformers, complex control systems requiring specialized maintenance.
Delta Electronics, Inc.
Technical Solution: Delta Electronics has developed solid-state transformer solutions focusing on high-frequency isolation and compact design for industrial and commercial applications. Their SST technology features multi-level converter architecture with advanced magnetic design optimization, achieving power densities 3-5 times higher than conventional transformers. The system incorporates intelligent power management with real-time load balancing, power factor correction, and harmonic mitigation capabilities. Delta's approach emphasizes cost-effective manufacturing while maintaining high efficiency levels above 95%. Their SST solutions are designed for data centers, industrial automation, and electric vehicle charging applications with modular scalability and hot-swappable components for enhanced serviceability.
Strengths: High power density, cost-effective design, strong manufacturing capabilities. Weaknesses: Limited utility-scale experience, focus primarily on lower voltage applications.
Core Technology Analysis of SST and VFD Systems
Solid state transformer
PatentPendingCN120582473A
Innovation
- A structure consisting of a first-stage circuit and a second-stage circuit is adopted, wherein the first-stage circuit operates with a modulation index greater than 1 to reduce the insulation requirements of the second-stage circuit and optimize the insulation design through different grounding schemes at the midpoint O and the ground terminal.
Forced convection cooling for medium frequency transformers inside medium voltage converter cabinets
PatentWO2022253918A1
Innovation
- The transformers are placed in a special cooling duct thermally decoupled from power converters, allowing for efficient forced convection cooling and insulation, with a support structure forming spatial gaps for coolant flow and using non-conductive materials to prevent eddy currents.
Grid Integration Standards and Regulations
The integration of solid-state transformers and variable-frequency drives into modern electrical grids requires adherence to a complex framework of international and regional standards. IEEE 1547 series provides fundamental guidelines for distributed energy resource interconnection, establishing voltage and frequency operating ranges that both SSTs and VFDs must maintain during grid-tied operations. The standard mandates specific ride-through capabilities during grid disturbances, with SSTs typically demonstrating superior performance due to their advanced power electronic controls and faster response times compared to conventional transformer-VFD combinations.
IEC 61850 communication protocols have become increasingly critical for both technologies, enabling standardized data exchange between grid operators and power conversion equipment. SSTs inherently support these communication standards through integrated digital interfaces, while VFD systems often require additional communication modules to achieve full compliance. The standard defines specific logical nodes and data objects that facilitate real-time monitoring, control, and protection coordination essential for smart grid applications.
Harmonic distortion regulations under IEEE 519 and IEC 61000 series present distinct compliance challenges for each technology. SSTs employ sophisticated multilevel converter topologies and advanced filtering techniques that typically achieve superior harmonic performance, often exceeding standard requirements. VFD systems, particularly those with six-pulse rectifiers, may require additional harmonic mitigation equipment such as active filters or multi-pulse configurations to meet grid code requirements, especially in weak grid conditions.
Grid code compliance varies significantly across regions, with European ENTSO-E requirements, North American NERC standards, and emerging Asian grid codes each presenting unique technical specifications. SSTs demonstrate greater flexibility in meeting diverse regional requirements due to their software-configurable nature, allowing parameter adjustments without hardware modifications. VFD systems may require region-specific hardware variants or additional protection equipment to satisfy local grid integration requirements.
Emerging regulations addressing grid resilience and cybersecurity, including IEC 62351 and NIST cybersecurity frameworks, increasingly favor technologies with inherent digital security capabilities. SSTs typically incorporate advanced cybersecurity features and encrypted communication protocols as standard functionality, while traditional VFD installations may require significant upgrades to meet evolving security standards for critical infrastructure protection.
IEC 61850 communication protocols have become increasingly critical for both technologies, enabling standardized data exchange between grid operators and power conversion equipment. SSTs inherently support these communication standards through integrated digital interfaces, while VFD systems often require additional communication modules to achieve full compliance. The standard defines specific logical nodes and data objects that facilitate real-time monitoring, control, and protection coordination essential for smart grid applications.
Harmonic distortion regulations under IEEE 519 and IEC 61000 series present distinct compliance challenges for each technology. SSTs employ sophisticated multilevel converter topologies and advanced filtering techniques that typically achieve superior harmonic performance, often exceeding standard requirements. VFD systems, particularly those with six-pulse rectifiers, may require additional harmonic mitigation equipment such as active filters or multi-pulse configurations to meet grid code requirements, especially in weak grid conditions.
Grid code compliance varies significantly across regions, with European ENTSO-E requirements, North American NERC standards, and emerging Asian grid codes each presenting unique technical specifications. SSTs demonstrate greater flexibility in meeting diverse regional requirements due to their software-configurable nature, allowing parameter adjustments without hardware modifications. VFD systems may require region-specific hardware variants or additional protection equipment to satisfy local grid integration requirements.
Emerging regulations addressing grid resilience and cybersecurity, including IEC 62351 and NIST cybersecurity frameworks, increasingly favor technologies with inherent digital security capabilities. SSTs typically incorporate advanced cybersecurity features and encrypted communication protocols as standard functionality, while traditional VFD installations may require significant upgrades to meet evolving security standards for critical infrastructure protection.
Energy Efficiency and Environmental Impact Assessment
Energy efficiency represents a critical differentiator between solid-state transformers and variable-frequency drives across various operational contexts. Solid-state transformers typically achieve efficiency ratings of 95-98% through advanced semiconductor switching technologies and optimized magnetic designs. These systems demonstrate superior performance in medium-voltage applications where traditional transformers experience significant core losses. The elimination of mechanical components and reduced electromagnetic interference contribute to sustained high-efficiency operation over extended periods.
Variable-frequency drives exhibit efficiency characteristics that vary significantly with load conditions and operational frequency ranges. Modern VFDs achieve peak efficiencies of 96-98% at rated loads but experience notable efficiency degradation at partial loads, particularly below 50% capacity. The switching losses in power electronics and harmonic distortion effects contribute to energy dissipation that becomes more pronounced in applications requiring frequent speed variations or extended low-load operation.
Environmental impact assessment reveals distinct advantages for solid-state transformers in carbon footprint reduction. The enhanced efficiency translates to approximately 2-4% reduction in energy consumption compared to conventional transformer-VFD combinations in typical industrial applications. This efficiency gain corresponds to significant CO2 emission reductions, particularly in regions with carbon-intensive electricity generation. The compact design and reduced material requirements further minimize manufacturing-related environmental impacts.
Lifecycle environmental analysis demonstrates that solid-state transformers offer superior sustainability profiles through extended operational lifespans and reduced maintenance requirements. The absence of oil-filled components eliminates potential environmental contamination risks and simplifies end-of-life disposal processes. However, the increased semiconductor content raises concerns regarding rare earth material usage and electronic waste management.
Variable-frequency drives present environmental challenges through harmonic generation and electromagnetic emissions that require additional filtering systems. These auxiliary components increase overall system complexity and material consumption while potentially reducing grid power quality. The environmental benefits of motor speed control and energy optimization in HVAC and pumping applications often offset these concerns in appropriate usage contexts.
Quantitative environmental impact studies indicate that solid-state transformers provide 15-25% lower total environmental impact scores in high-utilization industrial applications, while variable-frequency drives maintain advantages in applications where precise motor control delivers substantial energy savings through operational optimization rather than conversion efficiency improvements.
Variable-frequency drives exhibit efficiency characteristics that vary significantly with load conditions and operational frequency ranges. Modern VFDs achieve peak efficiencies of 96-98% at rated loads but experience notable efficiency degradation at partial loads, particularly below 50% capacity. The switching losses in power electronics and harmonic distortion effects contribute to energy dissipation that becomes more pronounced in applications requiring frequent speed variations or extended low-load operation.
Environmental impact assessment reveals distinct advantages for solid-state transformers in carbon footprint reduction. The enhanced efficiency translates to approximately 2-4% reduction in energy consumption compared to conventional transformer-VFD combinations in typical industrial applications. This efficiency gain corresponds to significant CO2 emission reductions, particularly in regions with carbon-intensive electricity generation. The compact design and reduced material requirements further minimize manufacturing-related environmental impacts.
Lifecycle environmental analysis demonstrates that solid-state transformers offer superior sustainability profiles through extended operational lifespans and reduced maintenance requirements. The absence of oil-filled components eliminates potential environmental contamination risks and simplifies end-of-life disposal processes. However, the increased semiconductor content raises concerns regarding rare earth material usage and electronic waste management.
Variable-frequency drives present environmental challenges through harmonic generation and electromagnetic emissions that require additional filtering systems. These auxiliary components increase overall system complexity and material consumption while potentially reducing grid power quality. The environmental benefits of motor speed control and energy optimization in HVAC and pumping applications often offset these concerns in appropriate usage contexts.
Quantitative environmental impact studies indicate that solid-state transformers provide 15-25% lower total environmental impact scores in high-utilization industrial applications, while variable-frequency drives maintain advantages in applications where precise motor control delivers substantial energy savings through operational optimization rather than conversion efficiency improvements.
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