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SIPROTEC-7UT85
Transformer differential protection – SIPROTEC 7UT85
- Stock status:
- In stock
- Manufacturer:
- Siemens
- Product code:
- SIPROTEC-7UT85
Main documents
Related products
| Hardware | |
| transformers | 4 current transformers |
| voltage | 0 / 3 voltage transformers |
| Product family | mv digital protection relays power analyzersOther |
| binary inputs | 3 / 7 binary inputs (thresholds configurable using software) |
| Product | |
| binary outputs | 5 / 8 binary outputs (2 changeover) |
| life contact | 1 life contact |
| Pluggable | Pluggable current and voltage terminals. |
| time-overcurrent | Directional time-overcurrent protection, ground (67N) |
| Trip-circuit | Trip-circuit supervision (74TC) |
| Additional Product Information | |
| Forward-power | Forward-power, reverse-power protection (32) |
| Rate-of-voltage | Rate-of-voltage-change protection (27R/59R) |
| Rate-of-frequency | Rate-of-frequency-change protection (81R) |
| programmable | 9 programmable function keys |
| Secondary current transformer values | Secondary current transformer values (1 A / 5 A) settable using DIGSI |
| Binary input | Binary input thresholds settable using DIGSI (3 stages) |
| Pluggable | Pluggable current and voltage terminals |
| frequency | Rate-of-frequency-change protection (81R) |
| voltage | Rate-of-voltage-change protection (27R/59R) |
| reclosing | Automatic reclosing (79) |
| Voltage dependent | Voltage dependent inverse-time overcurrent protection (51V) |
| Directional | Directional intermittent ground fault protection (67Ns) |
Product Description
Siemens
Siemens, a global leader in the electrical and industrial automation sectors, is renowned for its high-quality products and solutions, ranging from electrical equipment and automation systems to energy management and telecommunications technologies.
With a strong focus on innovation, Siemens provides cutting-edge solutions that enhance operational efficiency, sustainability, and productivity across various industries. From advanced circuit breakers and switchgear to smart grid solutions, Siemens continues to shape the future of technology, delivering reliable and energy-efficient products that meet the evolving needs of businesses and industries worldwide.
Reyrolle Siemens protection relays are designed for reliable and efficient safeguarding of electrical distribution systems. Known for their precision, durability, and advanced technology, these relays ensure the highest standards of safety and protection in industrial and commercial applications.
SIPROTEC-7UT85
The SIPROTEC-7UT85 is a modular, advanced differential protection device specifically designed for the protection of two-winding transformers. With its robust feature set, modular design, and compatibility with other protection devices, it is suitable for a range of transformer and power system applications, offering reliability and flexibility.
Key Features and Specifications
- The SIPROTEC-7UT85 serves as the main protection device for two-winding transformers, featuring differential protection with additional stabilization to handle various transformer configurations.
- Supports up to 2 restricted ground-fault protection functions, enhancing security and ensuring reliable fault detection.
Versatile Application:
- The device includes backup protection functions that can be used for cables, lines, and shunt reactors, making it a versatile solution for different system components.
- Interoperability with SIPROTEC 5 and SIPROTEC 4 line protection devices, enabling the use of line differential protection functions.
Modular and Flexible Design:
- The SIPROTEC 7UT85 benefits from a modular structure that allows for flexible customization and integration. Its compatibility with the DIGSI 5 engineering tool facilitates modern protection, control, automation, and monitoring applications.
- Expandable I/O structure within the SIPROTEC 5 modular system, ensuring adaptability for future needs.
Extensive Measuring Capabilities:
Equipped with:
- 5 three-phase current measuring points.
- 5 one-phase current measuring points.
- 5 three-phase and 5 one-phase voltage measuring points.
- Expandable to support 3-sided transformer protection, providing coverage for complex setups.
Inputs and Outputs:
The SIPROTEC 7UT85 comes in 2 standard variants, with:
- 8 current transformers.
- 7 to 19 binary inputs and 7 to 23 binary outputs, allowing for extensive control and monitoring.
Compact and Adaptable Hardware:
- Flexible housing width ranging from 1/3 × 19 inches to 2/1 × 19 inches, making it suitable for various installation environments.
- The device is designed to withstand extreme environmental conditions through conformal coating of electronic boards.
Applications:
Special Transformer Protection:
- Ideal for special transformers, including phase shifters, FACTS and converter transformers, arc furnace transformers, and HVDC transformers, ensuring reliable performance across diverse use cases.
Backup Protection:
- Can act as a backup protection device for motor and generator differential protection applications.
Short Cable and Line Protection:
- Provides protection for short cables and lines, offering additional security for various system components.
Voltage Control:
- Enables voltage control for two- and three-winding transformers, including parallel control setups.
Additional Line Protection:
- Supports distance and line differential protection, further extending its application range.
Benefits:
Reliable and Powerful Protection:
- The SIPROTEC-7UT85 ensures fast and stable fault detection for transformers, minimizing the risk of damage and ensuring quick recovery.
Easy Integration and Handling:
- User-friendly design makes device and software handling straightforward, reducing complexity in operation and setup.
High Availability and Cybersecurity:
- Designed for extreme environmental conditions, ensuring continuous availability.
- Cybersecurity features comply with NERC CIP and BDEW Whitepaper requirements, providing enhanced system security.
Compatibility:
- Fully compatible with IEC 61850 Editions 1, 2.0, and 2.1, ensuring smooth integration into modern electrical systems.
The SIPROTEC-7UT85 is an adaptable and powerful solution for transformer differential protection, suitable for both standard and complex electrical systems. Its modular design, advanced features, and broad compatibility make it a reliable choice for ensuring the safety and efficiency of transformers across various industries, from power generation to industrial applications.
Frequently Asked Questions
What is SIPROTEC 4?
✅ SIPROTEC 4 represents Siemens' benchmark in digital protection technology, offering reliable solutions for diverse industrial and energy applications. It remains a trusted choice for safeguarding electrical systems with precision and efficiency.
What is Reyrolle?
✅ Reyrolle, originally a British engineering company, revolutionized the power industry by manufacturing innovative switchgear for power stations worldwide. Today, Siemens continues its legacy through the Reyrolle product range, which provides robust and reliable protection relays for modern energy systems.
What is the function of a digital relay?
✅ A digital relay, like Siemens SIPROTEC models, uses advanced microprocessors to analyze power system voltages, currents, and other parameters. These relays detect faults in electrical systems or industrial processes, ensuring efficient protection and control.
What are the disadvantages of a digital relay?
✅ Digital relays, despite their precision and versatility, have some drawbacks. These include susceptibility to electromagnetic interference, higher power consumption, and the need for regular maintenance to avoid contact wear. However, SIPROTEC relays are engineered to mitigate many of these issues, ensuring superior performance and reliability.
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