siemens
Siemens Reyrolle 7SR21 Argus Feeder Protection Relay
Model: 7SR2102-1JA20-0DA0
4-hour response · Pricing in SAR · Delivery across all KSA regions
7SR2102-1JA20-0DA0 — Siemens Reyrolle 7SR21 Argus Feeder Protection Relay
The Siemens Reyrolle 7SR21 Argus is an advanced numerical overcurrent, directional, and earth fault protection relay for medium-voltage feeder, motor, and transformer protection in MV switchgear — a direct successor to Reyrolle's long-established tradition of UK-engineered distribution protection products that are widely used in the Middle East. The 7SR21 provides three-phase non-directional and directional overcurrent, earth fault (definite time and IDMT), negative sequence, under/over voltage, under/over frequency, and automatic reclose functions in a single 4U flush-mounted relay, covering the complete protection requirements of a distribution feeder or ring-main unit (RMU) circuit without additional relay units.
The 7SR21's directional earth fault element uses the polarising voltage (3V0) or polarising current (3I0) to determine fault direction, enabling selective earth fault protection on impedance-earthed or petersen-coil-earthed MV networks where conventional non-directional earth fault relays fail to discriminate between faults on adjacent feeders. IEC 61850 Edition 2 communication with GOOSE messaging enables the 7SR21 to participate in IEC 61850 substation automation architectures alongside SIPROTEC 5 protection IEDs — a critical requirement for Saudi Arabia's evolving digital substation programme. The integrated auto-reclose function with adjustable dead-time and reclaim-time covers the SEC standard 3-shot auto-reclose cycle for overhead distribution lines.
In Saudi Arabia, the Reyrolle 7SR21 KSA is deployed in industrial MV switchgear at SABIC and Aramco facilities where ring main distribution topology requires directional earth fault protection, and in SEC distribution substation feeders where the 7SR21's GOOSE communication capability supports the gradual digitalisation of protection schemes at existing substations being upgraded with IEC 61850 infrastructure. Saudi Arabian industrial projects with ABB or Schneider MV switchgear at 11 kV or 33 kV specify the 7SR21 as an alternative to SIPROTEC 5 relays where the Reyrolle-familiar protection engineering team has established relay settings and testing procedures.
Razz Middle East supplies, tests, and commissions 7SR21 relays in Saudi Arabia, providing protection setting studies, relay test reports, and IEC 61850 configuration for digital substation applications.
Technical Specifications
Full specifications for the 7SR2102-1JA20-0DA0
- Protection
- OC (3-phase), directional EF, IDMT, AR, UV/OV, UF/OF
- Earth Fault
- Directional (3V0 or 3I0 polarising)
- Auto-Reclose
- 3-shot with adjustable dead/reclaim time
- Communication
- IEC 61850 Ed 2, GOOSE, Modbus, DNP3
- Mounting
- 4U flush panel
- Auxiliary
- 24–250 V DC
- Event Log
- 500 events
- Standard
- IEC 60255
Key Features & Benefits
- Directional earth fault element using 3V0 or 3I0 polarisation enables selective earth fault protection on impedance-earthed and petersen-coil-earthed MV networks where non-directional relays fail to discriminate feeder faults.
- IEC 61850 Edition 2 GOOSE messaging allows the 7SR21 to participate in digital substation bay-bus protection schemes alongside SIPROTEC 5 IEDs, supporting Saudi Arabia's digital substation upgrade programme.
- IDMT overcurrent curves (normal inverse, very inverse, extremely inverse, long-time inverse) provide the grading flexibility required for co-ordinating with downstream fuses and upstream overcurrent protection in complex Saudi distribution networks.
- 3-shot auto-reclose with adjustable dead-time and reclaim-time per shot covers the SEC standard auto-reclose cycle for overhead 11 kV and 33 kV distribution lines, restoring supply after transient faults without operator intervention.
- Negative sequence overcurrent detection identifies motor phase-reversal and unbalanced supply conditions that cause motor overheating, providing early protection before the motor thermal overload operates.
- 500-event log with millisecond timestamps provides fault sequence-of-events data for post-fault analysis and root cause investigation at Saudi industrial MV switchgear and distribution substations.
- Established Reyrolle brand familiarity with Middle East protection engineers and utilities reduces protection scheme design and commissioning time at Saudi projects where Reyrolle relay procedures are already embedded in operating procedures.
Industrial Applications in Saudi Arabia
- MV feeder directional protection in ring-main distribution at SABIC Jubail petrochemical sites, where directional earth fault discrimination on the 33 kV ring identifies the faulted cable section without tripping the entire ring.
- Industrial transformer HV incomer protection at 11 kV and 33 kV transformers feeding large Saudi industrial MCCs, where the 7SR21 provides overcurrent, earth fault, and thermal replica protection for the transformer.
- SEC distribution substation feeder relay replacement in digital substation upgrade projects, where IEC 61850 Ed 2 GOOSE communication allows existing 7SR21 installations to interface with new SIPROTEC 5 bay controllers.
- Overhead distribution line protection at SEC 11 kV rural feeders, where 3-shot auto-reclose restores supply after transient faults caused by wildlife or wind-blown vegetation contact with overhead lines.
- Motor protection relay for large MV motors at water utility pump stations, where the 7SR21's negative sequence and thermal replica elements provide comprehensive motor protection beyond the overload relay function.
- Ring main unit (RMU) protection relay for commercial building 11 kV RMU installations at hospitals and large commercial buildings in Saudi cities, where the 7SR21's compact 4U flush form fits the standard RMU relay panel.
- Aramco 13.8 kV industrial switchgear feeder protection at upstream gas facilities, where the 7SR21's IDMT curves and directional earth fault provide the protection co-ordination required for multi-source MV distribution configurations.
Industrial Supplier in Saudi Arabia
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