In power systems, protecting electrical equipment from overcurrent faults is crucial. Overcurrent protection ensures the stability and reliability of the entire power network by preventing damage to transformers, cables, and other electrical components. The Siemens 7SJ80 Relay has become a preferred choice for many industries due to its advanced protection features, reliability, and ease of use. This cutting-edge device provides comprehensive overcurrent protection, making power systems more secure and efficient.
The Siemens Siprotec 7SJ80 Relay detects faults quickly and minimizes downtime by isolating faulty sections. This blog explores why the Siemens 7SJ80 relay is the right solution for overcurrent protection, highlighting its key features, applications, pricing, and reliable suppliers.

An Overview of the Siemens 7SJ80 Overcurrent Protection Numerical Relay

The Siemens 7SJ80 Overcurrent Protection Relay is a multi-functional protection device designed for safeguarding asynchronous motors of various sizes. This advanced relay serves as both primary motor protection and a backup relay for transformer differential protection systems. It features a comprehensive set of protection functions and customizable options, making it suitable for modern industrial applications.

The SIPROTEC 7SJ80 allows users to create up to 20 additional protection functions through its flexible protection framework. Functions such as frequency change protection or reverse power protection can be easily implemented. Additionally, the relay supports circuit breaker control, switching devices, and automation processes. Its integrated programmable logic (CFC) enables users to define custom logic for switchgear automation and generate user-defined messages.

• Conformal coating option (NEW)
• Pluggable current and voltage terminals
• Adjustable binary input thresholds via DIGSI (3 stages)
• Configurable secondary current transformer values (1 A / 5 A) using DIGSI
• 9 programmable function keys
• 6-line LCD
• Front-accessible exchangeable buffer battery
• USB front port
• Two additional communication ports
• Integrated Ethernet switch for cost-effective and redundant optical Ethernet rings
• Support for Ethernet redundancy protocols (RSTP, PRP, HSR)
• Relay-to-relay communication via IEC 61850 GOOSE
• Millisecond-accurate time synchronization through SNTP
• Expandable binary inputs and outputs with up to two SICAM I/O Units

The SIPROTEC 7SJ80 series is an ideal retrofit option for the older 7SJ600 series due to its identical cut-out dimensions. Additionally, upgrading to the 7SJ80 enables substations to adopt the IEC 61850 communication protocol, making them compatible with next-generation automation systems.

Protection Functions

• Overcurrent Protection (50, 50N, 51, 51N)
• Directional Time-Overcurrent Protection (67, 67N)
• Sensitive Directional Ground-Fault Detection (67Ns)
• High-Impedance Restricted Ground Fault (87N)
• Undercurrent Monitoring (37)
• Overload Protection (49)
• Under-/Overvoltage Protection (27/59)
• Frequency Protection (81O/U)
• Breaker Failure Protection (50BF)
• Negative-Sequence Protection (46)
• Synchro-Check (25)
• Auto-Reclosure (79)
• Fault Locator (21FL)
• Lockout Protection (86)

Features of Siemens 7SJ80 Relay

The Siemens 7SJ80 relay stands out due to its advanced design and cutting-edge features. Some of the standout features include:

• Comprehensive Protection Functions: 
  • Provides overcurrent, earth fault, and motor protection.
  • Supports directional and non-directional protection schemes.
• Fast Fault Detection:
  • Detects faults within milliseconds.
  • Improves system stability by isolating faulty sections quickly.
• Communication Protocols: 
  • Supports IEC 61850, Modbus, and DNP3 protocols.
  • Enhances interoperability in modern smart grids.
• Flexible Configuration:
  • Easily configurable for different protection applications.
  • User-friendly interface for quick parameter adjustments.
• Robust Design:
  • Built to withstand harsh environments.
  • Ensures reliable performance in industrial and utility applications.

These features make the Siemens Siprotec 7SJ80 Relay a versatile solution for power system protection.

Control Functions & Programmable Logic

• Control commands for circuit breakers, isolators, and disconnect switches
• Control options via keyboard, binary inputs, DIGSI 4, or SCADA systems
• Custom PLC logic programming with CFC (Continuous Function Chart)

Monitoring Functions

• Real-time measurement of voltage, current, and frequency
• Energy metering for active and reactive power
• Circuit-breaker wear monitoring
• Minimum and maximum value logging
• Trip circuit supervision (74TC)
• Fuse failure detection
• 8 Oscillographic fault records

Applications of Siemens 7SJ80 Relay

The Siemens 7SJ80 relay finds applications across various industries due to its flexibility and reliability. Some key applications include:

• Power Distribution Networks:
  • Provides overcurrent protection in medium and high-voltage networks.
  • Improves network stability by isolating faulty sections.
• Industrial Plants:
  • Protects motors, transformers, and cables.
  • Reduces downtime and maintenance costs.
• Renewable Energy Systems:
  • Ensures protection of solar and wind power plants.
  • Improves system efficiency and fault resilience.
• Railway Electrification:
  • Supports protection systems for traction power supplies.
  • Enhances safety and operational reliability.
• Data Centers:
  • Prevents power disruptions in critical infrastructure.
  • Ensures continuous operations with high-speed fault isolation.

These applications demonstrate the versatility of the Siemens 7SJ80 relay in various sectors.

Why Choose Siemens 7SJ80 for Overcurrent Protection?

The Siemens 7SJ80 relay offers several advantages that make it the ideal solution for overcurrent protection.

• Proven Reliability: Siemens has a long-standing reputation for producing high-quality protection devices. The Siemens Siprotec 7SJ80 Relay delivers consistent performance in demanding environments.
• Advanced Technology: With support for modern communication protocols and advanced protection algorithms, the relay enhances the efficiency of smart grids.
• Easy Integration: The relay’s modular design allows seamless integration into existing systems. Its user-friendly interface simplifies installation and configuration.
• Cost-Effective Solution: Investing in the Siemens 7SJ80 relay reduces operational downtime and extends the lifespan of electrical equipment.
• Global Support Network: Siemens offers excellent technical support and after-sales service, ensuring long-term reliability.

These benefits make the Siemens Siprotec 7SJ80 Relay a top choice for industries worldwide.

Siemens Siprotec 7SJ80 Relay Price: Factors Affecting Cost

The Siemens Siprotec 7SJ80 Relay Price can vary depending on several factors, such as:

• Configuration and Features: Advanced configurations with additional protection functions may increase the price.
• Communication Protocols: Models supporting IEC 61850 and other communication protocols may cost more.
• Supplier Location: Prices can differ based on the supplier’s location and shipping costs.
• Bulk Purchases: Buying in bulk from authorized Siemens Siprotec 7SJ80 Relay Suppliers may offer cost savings.
• Warranty and Support: Extended warranty options and technical support may add to the overall price.

Consulting reliable Siemens Siprotec 7SJ80 Relay Suppliers will provide the most accurate pricing based on your project requirements.

Choosing Siemens Siprotec 7SJ80 Relay Suppliers

Selecting the right Siemens Siprotec 7SJ80 Relay Suppliers is essential to ensure product quality and performance. Consider the following factors:

• Authorized Distributors:
  • Verify if the supplier is an authorized Siemens distributor.
  • Authorized suppliers guarantee genuine products.
• Technical Support:
  • Choose suppliers offering technical guidance and after-sales service.
  • Ensure they provide product installation assistance.
• Stock Availability:
  • Opt for suppliers with ready stock to avoid project delays.
  • Check delivery timelines for urgent requirements.
• Competitive Pricing:
  • Compare Siemens Siprotec 7SJ80 Relay Price across multiple suppliers.
  • Look for bulk purchase discounts.
• Customer Reviews:
  • Research supplier reviews and customer feedback.
  • Choose suppliers with a strong reputation in the industry.

You can guarantee a smooth procurement process and dependable product performance by choosing the appropriate supplier.

Conclusion

The Siemens 7SJ80 Relay has become a game-changer in overcurrent protection for power systems. Its advanced features, fast fault detection, and robust design make it an essential component in modern power networks. Industries across various sectors rely on the Siemens Siprotec 7SJ80 Relay for its proven performance and reliability.

Understanding the Siemens Siprotec 7SJ80 Relay Price and choosing trusted Siemens Siprotec 7SJ80 Relay Suppliers will help you make informed purchasing decisions. With its comprehensive protection functions and cost-effective performance, the Siemens 7SJ80 relay enhances grid stability and protects critical infrastructure.

Investing in the Siemens Siprotec 7SJ80 Relay improves operational efficiency, minimizes downtime, and ensures the long-term stability of your power systems.

Reliserv Solution, a Platinum Channel Partner and authorized supplier of Siemens, provides Siemens Numerical Relays. Mumbai, Maharashtra, is home to the company’s headquarters. We also offer a wide range of services and customized solutions to many industries and panel builders. Please contact us by phone at +917506112097 or by email at [email protected] if you need assistance or have any questions. The Siemens 7SJ80 Siprotec Compact Overcurrent Protection Numerical Relay, a well-known Siemens product from Siemens Numerical Relays, can be viewed by clicking here.