siemens
Siemens SIPROTEC 7UM85 Generator Protection Relay
Model: 7UM8511-5EB90-2FA0
4-hour response · Pricing in SAR · Delivery across all KSA regions
7UM8511-5EB90-2FA0 — Siemens SIPROTEC 7UM85 Generator Protection Relay
The Siemens SIPROTEC 7UM85 is the comprehensive numerical generator protection IED within the SIPROTEC 5 platform, providing the complete protection suite required for synchronous generators in power stations, co-generation plants, and industrial embedded generation. The 7UM85 integrates in a single device all generator protection functions previously requiring multiple discrete relays: differential protection (87G), overcurrent (50/51), directional earth fault (67N), loss of field (40), out-of-step (78), reverse power (32), under/over frequency (81U/O), under/over voltage (27/59), negative sequence (46), stator earth fault (64G), rotor earth fault (64R), inadvertent energisation (50/27), voltage restrained overcurrent, and synchronism check (25) for parallel operation.
Built on SIPROTEC 5's modular hardware, the 7UM85 accepts up to four three-phase CT input sets and up to three VT input sets, enabling differential, impedance, and directional protection across the complete generator-transformer unit configuration without external interposing transformers. The IEC 61850 Edition 2 communication interface supports GOOSE messaging for fast intertripping between the 7UM85 and the generator's circuit breaker and field circuit breaker, with MMS reporting to the substation control system. DIGSI 5 engineering software provides a graphical single-line diagram view of the generator-transformer unit, simplifying protection setting calculation, simulation, and documentation.
In Saudi Arabia, the SIPROTEC 7UM85 KSA is deployed in combined cycle power stations operated by SEC's independent power producers, co-generation plants at SABIC and Aramco refineries, and the large embedded generation systems at MARAFIQ utility complexes. The Kingdom's Vision 2030 renewable energy programme is driving significant installation of large solar PV and wind farm generator protection systems based on the 7UM85, where its sophisticated inadvertent energisation and loss of mains protection functions address the unique challenges of inverter-connected and synchronous generator parallel operation on the Saudi grid.
Razz Middle East provides complete SIPROTEC 7UM85 supply, DIGSI 5 engineering, protection setting calculation, factory acceptance testing (FAT), and site acceptance testing (SAT) services across Saudi Arabia. Our IEC 61850 specialists handle full GOOSE inter-tripping scheme commissioning.
Technical Specifications
Full specifications for the 7UM8511-5EB90-2FA0
- Protected Object
- Synchronous generators and generator-transformer units
- Protection Functions
- 87G, 50/51, 67N, 40, 78, 32, 81U/O, 27/59, 46, 64G, 64R, 50/27, 25
- CT Inputs
- 4 × 3-phase sets (1 A or 5 A)
- VT Inputs
- 3 × 3-phase sets
- Communication
- IEC 61850 Ed 2, GOOSE, MMS, IEC 60870-5-104
- Software
- DIGSI 5
- Mounting
- 19" rack
- Time Sync
- GPS / IEEE 1588 PTP
- Standard
- IEC 60255, IEEE C37.102
Key Features & Benefits
- Complete generator protection suite in a single IED replaces up to 12 discrete relays, reducing secondary panel size, cable count, and maintenance complexity by up to 60% compared to conventional relay schemes.
- Transformer differential protection (87T) included in addition to generator differential (87G) allows the 7UM85 to protect the complete generator-transformer unit, eliminating the need for a separate transformer protection relay.
- Loss of field (40) protection detects loss of excitation using dual-zone impedance characteristic, with an adjustable time delay to ride through normal transient stability events without nuisance tripping during grid disturbances.
- Inadvertent energisation (50/27) protection detects the dangerous condition of closing the circuit breaker onto a stationary or slowly rotating generator, a common cause of catastrophic generator damage during maintenance.
- IEC 61850 GOOSE inter-tripping allows the 7UM85 to send fast trip commands to the generator circuit breaker and field circuit breaker simultaneously within 4 ms via the station bus, replacing hardwired trip circuits.
- Out-of-step (78) protection using the loss-of-synchronism relay element detects pole slipping before the resulting mechanical torque transients damage the generator shaft and couplings.
- DIGSI 5 simulation mode allows complete relay scheme testing with injected current and voltage test signals before installation, reducing commissioning time at the power station site by verifying all protection functions in the factory.
Industrial Applications in Saudi Arabia
- Combined cycle power station generator protection for SEC-affiliated independent power producers across Saudi Arabia, where the 7UM85's complete function set replaces multiple discrete relay panels in the generator control cubicle.
- Co-generation plant generator protection at SABIC Jubail petrochemical complexes, where the 7UM85 coordinates generator protection, transformer protection, and bus-coupler interlocking in a single SIPROTEC 5 architecture.
- Large solar PV inverter interconnection protection at utility-scale renewable energy projects under Saudi Vision 2030's 58.7 GW renewable target, where loss of mains and anti-islanding functions are mandatory GCCIA requirements.
- Aramco gas turbine generator protection at remote gas gathering and processing facilities in the Empty Quarter, where the 7UM85's reliability and HART/IEC 61850 communication minimise costly field service trips.
- MARAFIQ utility complex embedded generation protection at Jubail and Yanbu industrial cities, where the generator protection coordinates with the utility interbus protection to maintain supply to critical industrial consumers.
- Backup power generator protection in SEC-classified critical infrastructure facilities including desalination plants and water pumping stations, where the 7UM85's synchronism check prevents out-of-phase paralleling.
- Wind farm doubly-fed induction generator (DFIG) protection at the Dumat Al-Jandal wind project, where the 7UM85's negative sequence and rotor earth fault elements address the unique protection requirements of DFIG technology.
Industrial Supplier in Saudi Arabia
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