siemens
Siemens SIPROTEC 7SA87 Distance Protection Relay
Model: 7SA8711-5EB90-2FA0
4-hour response · Pricing in SAR · Delivery across all KSA regions
7SA8711-5EB90-2FA0 — Siemens SIPROTEC 7SA87 Distance Protection Relay
The Siemens SIPROTEC 7SA87 is the advanced line protection IED in the SIPROTEC 5 platform, delivering comprehensive distance protection for transmission and sub-transmission overhead lines and cables at voltage levels from 33 kV to 765 kV. The 7SA87 implements up to six zones of both mho and quadrilateral impedance characteristics simultaneously — a combination that provides superior selectivity on the complex transmission networks of Saudi Arabia's National Grid, where long EHV lines coexist with short sub-transmission feeders requiring different protection philosophies in the same substation. The quadrilateral characteristic with independent reactance and resistance reach settings provides load encroachment immunity on heavily loaded 380 kV and 500 kV interconnection lines.
The 7SA87 supports all major teleprotection schemes — PUTT (Permissive Underreach Transfer Trip), POTT (Permissive Overreach Transfer Trip), and blocking — over fibre, pilot wire, power line carrier (PLC), or digital communication channels. The built-in four-shot auto-reclose function with independent dead-time and reclaim-time settings per zone covers the complete auto-reclose requirements of Saudi Arabia's transmission system, including delayed auto-reclose on 132 kV and 230 kV lines. Fault locator with end-to-end impedance and two-ended methods improves line fault location accuracy to within 1% of line length, critical for rapid patrolling of Saudi Arabia's long desert transmission routes.
SEC (Saudi Electricity Company) and National Grid SA specify the SIPROTEC 5 protection platform for transmission line protection on new EHV and HV lines across the Kingdom, and the 7SA87 is the standard distance relay for 132 kV, 230 kV, and 380 kV line protection schemes from the northern industrial corridor through the Western Region to the Eastern Province interconnection. Marafiq 132 kV transmission lines linking Jubail Industrial City's power generation to its industrial consumers use the 7SA87's teleprotection scheme for fast fault clearance.
Razz Middle East provides 7SA87 supply, protection setting studies, DIGSI 5 configuration, IEC 61850 GOOSE scheme setup, FAT and SAT services, and ongoing secondary injection testing support across Saudi Arabia.
Technical Specifications
Full specifications for the 7SA8711-5EB90-2FA0
- Protection
- Distance (6 zones), 50/51/67, AR, BF, CVT
- Characteristics
- Mho + quadrilateral (simultaneous)
- Teleprotection
- PUTT, POTT, blocking (fibre, PLC, digital)
- Auto-Reclose
- 4-shot (single-phase + 3-phase)
- Fault Locator
- End-to-end / impedance methods
- Communication
- IEC 61850 Ed 2, GOOSE, DNP3, IEC 60870-5-101/104
- Software
- DIGSI 5
- Mounting
- 19" rack
- Time Sync
- GPS / IEEE 1588 (<1 µs)
Key Features & Benefits
- Simultaneous mho and quadrilateral impedance zones allow independent protection philosophies for long EHV transmission and short sub-transmission lines within the same relay, avoiding the need for separate relays at multi-voltage substations.
- Quadrilateral characteristic with independent R and X reach settings provides load encroachment immunity for heavily loaded 380 kV and 500 kV Saudi interconnection lines, preventing nuisance tripping during peak demand periods.
- PUTT, POTT, and blocking teleprotection schemes over fibre, PLC, or digital channels provide fast fault clearance in under 20 ms for Zone 1 faults, meeting GCCIA grid code requirements for EHV transmission protection.
- Four-shot auto-reclose with independent dead-time per shot enables single-pole auto-reclose on 380 kV lines, reducing the steady-state fault current exposure for multi-phase transient faults and improving grid stability.
- Accurate fault locator using end-to-end and two-ended impedance methods pinpoints fault location to within 1% of line length, reducing patrol time on Saudi Arabia's long desert transmission line routes by up to 80%.
- Breaker failure protection (50BF) with independent BF timer and inter-tripping to adjacent bays via IEC 61850 GOOSE provides a critical backup clearing mechanism when the local circuit breaker fails to trip.
- Capacitive voltage transformer (CVT) transient suppression algorithm prevents distance relay mal-operation during CVT transients, a common challenge on Saudi Arabia's EHV transmission substations using 230 kV and 380 kV CVTs.
Industrial Applications in Saudi Arabia
- SEC 380 kV and 500 kV EHV transmission line protection for National Grid SA backbone interconnections, where quadrilateral characteristic load encroachment immunity is essential for heavily loaded inter-regional tie lines.
- 132 kV sub-transmission line protection for industrial areas and city substations across Saudi Arabia, where POTT teleprotection over digital communication channels ensures fast fault clearance in under 30 ms.
- MARAFIQ 132 kV transmission line protection for Jubail Industrial City power supply, where the 7SA87's fault locator reduces patrol time on the 45 km overhead line route across the coastal industrial zone.
- NEOM 380 kV transmission corridor protection for the renewable energy collection system, where IEC 61850 GOOSE communication enables the wide-area protection scheme required for the distributed renewable energy architecture.
- Saudi Aramco 33 kV and 115 kV dedicated supply line protection for critical upstream and downstream process facilities, where the 7SA87's blocked overreach scheme provides backup coverage without impacting supply continuity.
- Offshore platform supply cable protection at Saudi Aramco island and offshore installations, where the high-set distance element detects cable faults rapidly to prevent damage to subsea power cable infrastructure.
- Power plant generator step-up transformer HV line protection at SEC IPP facilities, where the 7SA87 provides transformer incomer distance protection coordinated with the unit transformer differential scheme.
Industrial Supplier in Saudi Arabia
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Frequently Asked Questions — 7SA8711-5EB90-2FA0
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