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SIPROTEC-7UT85
Transformer differential protection – SIPROTEC 7UT85
- Stock status:
- Call for availability
- 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
The SIPROTEC 7UT85 is a highly advanced, modular protection relay designed specifically for two-winding power transformers and autotransformers. This device provides comprehensive transformer differential protection along with a wide range of additional features that enhance reliability, flexibility, and system diagnostics.
Key Features and Benefits:
Powerful Transformer Protection: Tailored for two-winding transformers, with the option to extend to three-winding configurations. It also supports protection of phase-angle regulating transformers, special transformers, short cables, shunt reactors, and motors.
Versatile Application: Can be used for backup protection of motors and generators, short lines, voltage control of multi-winding transformers, and additional line protection (distance and line differential).
Advanced Differential Protection: Features include:
- Flexible adaptation to transformer vector groups.
- Inrush current and overexcitation protection.
- High reliability under CT saturation.
- Adaptive operate curve based on transformer tap position.
- Sensitive ground fault detection near the neutral point with separate restricted earth fault protection.
Engineering and Operation:
- DIGSI 5 Integration: Enables user-friendly configuration, operation, and monitoring.
- Modular Design: Provides maximum flexibility in protection and control strategies.
- Robust Build: Standard coating on modules ensures high availability even in harsh environments.
- Cybersecurity: Compliant with NERC CIP and BDEW Whitepaper standards.
Communication and Monitoring:
- IEC 61850 Compatibility: Supports Editions 1, 2.0, and 2.1 for future-proof communication.
- Reliable Networking: Offers PRP (Parallel Redundancy Protocol) and HSR (High-availability Seamless Redundancy) for uninterrupted communication.
- Virtual Network Sharing: Supports IEEE 802.1Q (VLAN).
- Secure Long-Distance Communication: Via optical fiber, copper wire, and communication networks.
Power Quality and Measurement:
- PQ Basic Monitoring: Includes functions for detecting voltage unbalance, overvoltages, dips, interruptions, TDD, THD, and harmonics.
- Operational Analysis Tools: Real-time capturing of measured and protection values for commissioning, evaluation, and fault analysis.
- Frequency Tracking: Protection functions operate across a wide frequency range (10 Hz – 90 Hz) with the ability to assign them to independent frequency tracking groups.
- PMU (Phasor Measurement Unit): Enables synchrophasor measurements using the IEEE C37.118 protocol.
Additional Functionalities:
- Arc Flash Protection
- Dynamic Voltage Control (DVC): Adjusts voltage target dynamically based on the power flow direction.
- Voltage Controller (ANSI 90V): For two- and three-winding transformers as well as parallel grid coupling transformers with features like circulating reactive current minimization.
This makes the SIPROTEC 7UT85 a highly reliable and flexible protection device ideal for demanding transformer and grid applications where precision, performance, and resilience are critical.
Frequently Asked Questions
What is SIPROTEC used for?
✅ SIPROTEC devices, including SIPROTEC 5, are designed for advanced protection, control, monitoring, and measurement in electrical energy systems. With modular hardware, flexible software, and the powerful DIGSI 5 engineering tool, they provide unmatched reliability and efficiency in industrial automation and energy applications.
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 SIPROTEC 5?
✅SIPROTEC 5 is a state-of-the-art protection, automation, and monitoring system developed by Siemens for use in electrical power systems. Designed with modular hardware and software architecture, SIPROTEC 5 devices provide advanced solutions for protection, control, measurement, and system monitoring in medium- and high-voltage networks.
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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