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SIPROTEC-7SJ80
Overcurrent protection – SIPROTEC 7SJ80
- Stock status:
- Call for availability
- Manufacturer:
- Siemens
- Product code:
- SIPROTEC-7SJ80
Main documents
Related products
| Hardware | |
| transformers | 4 current transformers |
| Product Description | The SIPROTEC 7SJ80 relays can be used for feeder protection of high and medium-voltage networks with grounded, low-resistance grounded, isolated or a compensated neutral point. The relays have all the required functions to be applied as a backup relay to a transformer differential relay. |
| Product family | mv digital protection relays power analyzersOther |
| binary inputs | 3/7/11 binary inputs (thresholds configurable using software) |
| Product | |
| binary outputs | 5/8 binary outputs (2 changeover / form C contacts) |
| life contact | 1 life contact |
| Pluggable | Pluggable current and voltage terminals.Show prices |
| Inrush restraint | Inrush restraint |
| Trip-circuit | Trip-circuit supervision (74TC) |
| Additional Product Information | |
| Display | 6-line display |
| USB | USB front port |
| Ports | 2 additional communication ports |
| 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 7SJ80 is a highly flexible protection relay designed for feeder protection in medium- and high-voltage networks. It supports networks with grounded, low-resistance grounded, isolated, or compensated neutral points, and is also ideal for backup protection of transformers. Featuring the powerful CFC logic editor, multiple programmable function keys, and extensive communication options, the 7SJ80 combines automation, monitoring, and protection into a single compact device.
Key Benefits:
Extremely Flexible Protection: Create up to 20 additional user-defined protection functions, such as reverse power or frequency-based schemes.
Integrated Logic (CFC): Enables custom automation, switching logic, interlocking, and custom message generation.
Modular and Expandable I/O: Optional connection to SICAM I/O units to increase binary inputs/outputs as needed.
Modern Communication: Native IEC 61850, GOOSE, and support for Ethernet-based communication with redundancy.
Compact Yet Feature-Rich: Compact hardware design with pluggable terminals, USB front port, and easy DIGSI configuration.
Hardware Overview:
- Current Transformer Inputs: 4
- Voltage Transformer Inputs: 0 or 3
- Binary Inputs: 3, 7, or 11 (configurable thresholds via DIGSI)
- Binary Outputs: 5 or 8 (includes 2 changeover contacts)
- Life Contact: 1
- Display: 6-line front display
- Ports:
- 1 USB front port
- 2 rear communication ports
- Integrated Ethernet switch (optical or electrical)
Protection & Monitoring Functions:
- Time-Overcurrent Protection: Phase & ground (50, 50N, 51, 51N)
- Directional Overcurrent Protection: Phase & ground (67, 67N, 67Ns)
- Intermittent Ground Fault Protection: Directional and non-directional
- Restricted Ground-Fault Protection: High-impedance (87N)
- Voltage Protection: Overvoltage, undervoltage, zero-sequence voltage (59, 27, 59N)
- Frequency Protection: Over/under frequency (81O/U), rate-of-change (81R)
- Reverse & Forward Power Protection: (32)
- Power Factor Monitoring: (55)
- Breaker Failure Protection: (50BF)
- Load & Current Monitoring:
- Overload protection (49)
- Undercurrent monitoring (37)
- Unbalanced load (46)
- Additional Features:
- Synchrocheck (25)
- Automatic reclosing (79)
- Fault locator (FL)
- Lockout function (86)
- Voltage-dependent inverse-time overcurrent (51V)
- Phase-sequence supervision (47)
- Inrush restraint
- Trip circuit supervision (74TC)
Communication & Cybersecurity:
- Protocols: IEC 61850 with GOOSE, SNTP time sync over Ethernet
- Redundancy: Supports RSTP, PRP, and HSR for high availability
- Relay-to-Relay Communication: Fast messaging and protection coordination via Ethernet
- User Interface:
- 9 programmable function keys
- Configurable input thresholds (3 stages) via DIGSI
- USB front access for local setup
Applications:
Feeder Protection: In radial, ring, and meshed topologies at any voltage level
Transformer Backup Protection: With inrush restraint and high-impedance ground fault detection
Custom Protection Schemes: Reverse power, frequency-based disconnection, or other programmable logic-based schemes
Smart Substation Integration: With synchrophasors, Ethernet-based logic, and full IEC 61850 support
Modular IO Extension: Through connection to SICAM I/O units
The SIPROTEC 7SJ80 is a versatile and intelligent solution for modern power system protection. Its powerful logic capabilities, robust protection functions, and advanced communication options make it ideal for both traditional substations and future-proof digital switchgear systems.
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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