siemens
Siemens SIPROTEC 7SD82 Line Differential Protection Relay
Model: 7SD8220-5EB90-1FB0
4-hour response · Pricing in SAR · Delivery across all KSA regions
7SD8220-5EB90-1FB0 — Siemens SIPROTEC 7SD82 Line Differential Protection Relay
The Siemens SIPROTEC 7SD82 is the current differential protection relay for high-speed protection of overhead transmission lines and underground cables, providing fault detection independent of fault resistance, load current, and power swings — the most critical property for reliable protection of Saudi Arabia's 380/220 kV overhead transmission lines where evolving grid conditions require fault-resistance-independent protection. The 7SD82 operates a two-ended differential principle: current measurements from both line ends are transmitted via fibre or multiplexed digital communication and compared instantaneously, tripping only when the current difference between line ends exceeds the differential threshold — indicating a fault on the protected line section with no possibility of mal-operation for external faults.
The 7SD82's response time of less than 20 ms to line-end trip achieves fast fault clearance meeting SEC's critical fault clearance time requirements for 380 kV transmission, where delayed fault clearance causes voltage instability and cascading trips at adjacent substations. The relay incorporates distance protection, directional overcurrent, automatic reclosing, and sync-check functions in addition to differential — providing a complete main protection suite in one relay that eliminates the need for a separate backup protection IED at each line terminal. IEC 61850 GOOSE messaging enables tripping of adjacent circuit breakers within 4 ms for busbar fault acceleration and inter-trip schemes.
In Saudi Arabia, the 7SD82 is specified for new 380 kV and 220 kV transmission line projects by SEC and TRANSCO, replacing older non-communications distance protection with modern differential protection that provides higher dependability for the Kingdom's evolving high-density transmission grid. ARAMCO's large industrial substation interconnecting cables and 115 kV power delivery cables to major complexes in the Eastern Province also use 7SD82 for the primary protection function.
Razz Middle East supplies SIPROTEC 7SD82 with Digsi 5 configuration, communication channel commissioning, and SEC approval documentation support for Saudi transmission protection projects.
Technical Specifications
Full specifications for the 7SD8220-5EB90-1FB0
- Protection
- Current differential (main), distance, directional overcurrent, reclose, sync-check
- Trip Time
- <20 ms (differential)
- Communication
- Fibre or multiplexed digital (64 kbit/s or higher)
- Goose
- IEC 61850 GOOSE <4 ms inter-trip
- Current Inputs
- 4× CT (3-phase + earth)
- Voltage Inputs
- 4× VT (3-phase + earth)
- Safety
- SIL 2 capable
- Standard
- IEC 60255
Key Features & Benefits
- Current differential operating principle detects faults independent of fault resistance, load flow direction, and power swings — avoiding the mal-operation vulnerability of distance protection relays under stressed grid conditions.
- Trip time less than 20 ms satisfies SEC critical fault clearance time requirements for 380 kV transmission, where delayed clearance triggers voltage instability and cascading failures across the grid.
- Distance protection, directional overcurrent, auto-reclose, and sync-check integrated in one relay provides a complete main and backup protection suite, eliminating the need for a separate backup protection IED.
- IEC 61850 GOOSE messaging enables inter-trip and busbar fault acceleration within 4 ms, without the 20–30 ms delay of hardwired inter-trip schemes using traditional output contacts.
- IEEE 1588 PTP time synchronisation with sub-microsecond accuracy enables precise sequence-of-events recording across multiple substation IEDs in SEC control centre post-fault analysis.
- Fibre-optic and multiplexed communication channel support provides flexibility for direct fibre pilot and pilot-on-SDH/SONET multiplexer communication configurations of Saudi transmission line differential protection schemes.
- Comprehensive self-monitoring with automatic blocking on detected internal hardware faults prevents incorrect operation of the protection function and alerts the control centre to IED maintenance requirements.
Industrial Applications in Saudi Arabia
- SEC 380 kV and 220 kV overhead transmission line main protection, where current differential independence from fault resistance and power swings provides higher security than distance protection alone.
- Saudi transmission line backup protection replacement, where new 7SD82 differential relays replace aging 1990s and 2000s distance protection relays with modern IEC 61850 units.
- ARAMCO 115 kV industrial facility cable and overhead line protection in the Eastern Province, where fast differential tripping clears cable faults before arc energy causes conductor damage.
- NEOM transmission network protection, where 7SD82's IEC 61850 GOOSE and IEC 61850-9-2 process bus capability aligns with NEOM's fully digital substation architecture.
- Jeddah and Riyadh urban underground cable transmission system protection, where differential protection provides high-speed selective fault isolation for underground cable faults.
- SEC–GCCIA Gulf grid interconnection transmission line protection, where 7SD82 differential provides the highest reliability protection for the critical cross-border transmission links.
- IPP and renewable energy plant grid connection line protection, where 7SD82 satisfies SEC grid connection technical requirements for protection of the transmission line between the plant and the SEC substation.
Industrial Supplier in Saudi Arabia
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Common questions from buyers in Saudi Arabia and the GCC