Siemens SIPROTEC 5 7UT85 Transformer Differential Protection Relay
Siemens SIPROTEC 5 7UT85 Transformer Differential Protection Relay Suppliers,Exporters in India
ARP IMPEX is a supplier and exporter of Siemens SIPROTEC 5 7UT85 Transformer Differential Protection Relays in India. We handle requirements for transformer protection panels, utility substations, industrial power systems, power plants, EPC projects and replacement of existing Siemens relays.
The Siemens SIPROTEC 7UT85 is a modular numerical relay mainly used for the differential protection of two-winding transformers and autotransformers. The hardware can also be expanded for three-winding transformer protection, depending on the selected configuration.
The relay provides the main protection for the transformer and can detect internal phase faults and earth faults before they cause major damage. Restricted earth-fault protection can be included for better fault detection near the transformer neutral point.
The 7UT85 is more flexible than a compact transformer relay. Additional current inputs, voltage inputs, binary contacts and communication modules can be selected according to the protection panel. This makes it useful for complex transformer protection schemes, large substations and projects where future expansion may be required.
The relay compensates for the transformer vector group and tap position. It also distinguishes genuine internal faults from transformer inrush current and remains stable during external faults with current-transformer saturation.
Apart from transformer differential protection, applicable configurations can provide overcurrent, earth-fault, voltage, frequency, arc and backup protection. The relay can also be used for short cables, shunt reactors and selected special transformer applications.
Siemens DIGSI 5 is used for relay configuration, settings, logic and commissioning. IEC 61850 and optional communication modules support integration with SCADA, station control and digital substation systems.
For the Siemens SIPROTEC 7UT85 price, availability or export quotation, share the complete Siemens article number, required quantity and destination country.
Technical Specifications
- Brand: Siemens
- Product family: SIPROTEC 5
- Model: 7UT85
- Product type: Modular transformer differential protection relay
- Main application: Two-winding transformer and autotransformer protection
- Expansion: Configurable for up to three transformer sides
- Main protection: Transformer differential protection
- Restricted earth fault: Up to two functions, depending on configuration
- Current measuring points: Up to five three-phase and five single-phase points
- Voltage measuring points: Up to five three-phase and five single-phase points
- Standard variants: Two predefined hardware arrangements
- Current inputs: Eight CT inputs in predefined standard variants
- Binary inputs: 7 to 19, depending on hardware
- Binary outputs: 7 to 23, depending on hardware
- I/O arrangement: Expandable through the SIPROTEC 5 modular system
- Engineering software: Siemens DIGSI 5
- Communication: Up to four plug-in communication modules
- IEC 61850: Supported for substation communication
- Logic: Programmable protection and automation logic
- Recording: Event, fault and disturbance records
- Housing: Different widths are available according to hardware selection
The complete input arrangement, housing size, communication ports and enabled protection functions depend on the Siemens MLFB or article number.
Main Protection Functions
Depending on the ordered configuration, the Siemens SIPROTEC 7UT85 can provide:
- Two-winding transformer differential protection
- Autotransformer differential protection
- Three-winding transformer protection with hardware expansion
- Restricted earth-fault protection
- Transformer inrush restraint
- Overexcitation supervision
- Adaptation to transformer vector groups
- Tap-position compensation
- Phase and earth overcurrent backup protection
- Voltage and frequency protection
- Arc protection
- Protection for short cables and lines
- Shunt-reactor protection
- Motor and generator differential backup protection
- Programmable tripping, alarm and interlocking logic
The enabled functions should be confirmed before the quotation. A basic transformer differential relay may not have the same voltage inputs, additional protection functions or communication modules as a larger 7UT85 configuration.
Features
- Provides the main differential protection for power transformers
- Suitable for two-winding transformers and autotransformers
- Can be expanded for three-winding transformer applications
- Restricted earth-fault protection improves sensitivity near the neutral point
- Inrush restraint helps prevent unwanted trips during transformer energisation
- Stable operation during external faults and CT saturation
- Automatically compensates for transformer vector-group differences
- Can adapt the operating characteristic to the transformer tap position
- Additional current and voltage inputs support backup protection
- Modular inputs and outputs suit small and complex protection panels
- Up to four communication modules can be included
- Programmable logic supports alarms, tripping and interlocking
- DIGSI 5 is used for settings, testing and commissioning
- IEC 61850 supports modern substation automation
- Fault and disturbance records help investigate transformer trips
- Standard coating protects the electronic modules in demanding environments
- Suitable for new transformer panels, upgrades and relay replacement
- Can combine transformer protection and selected line or reactor protection functions
Applications
Siemens SIPROTEC 5 7UT85 Transformer Differential Protection Relays are used for:
- Two-winding power transformers
- Autotransformers
- Three-winding transformers with an expanded configuration
- Medium-voltage transformer protection panels
- High-voltage and extra-high-voltage substations
- Utility transmission and distribution substations
- Power-generation substations
- Captive power plants
- Industrial substations
- Grid-coupling transformers
- Phase-shifting transformers
- Converter transformers
- HVDC transformers
- FACTS transformers
- Electric arc-furnace transformers
- Short cable and line protection
- Shunt-reactor protection
- Transformer voltage-control schemes
- Transformer protection-panel retrofit projects
- Replacement of older Siemens transformer relays
Siemens identifies special transformers, short cables, shunt reactors, voltage-control schemes and selected motor or generator backup duties among the wider applications supported by the 7UT85 platform.
Siemens 7UT82 vs 7UT85
The SIPROTEC 7UT82 is a compact option mainly intended for two-winding transformer protection. The 7UT85 uses modular and expandable hardware, making it better suited to projects that require more measuring points, additional binary contacts, multiple communication interfaces or expansion to three transformer sides.
The correct model should be selected from the actual transformer protection scheme rather than only the transformer rating.
Selecting the Correct Siemens 7UT85 Relay
“Siemens SIPROTEC 7UT85” does not identify a fixed relay. The hardware, number of inputs and outputs, communication modules, display and protection functions can differ between article numbers.
For an accurate quotation, share:
- Complete Siemens article number or MLFB
- Required quantity
- Destination country
- Communication requirement, where applicable
For replacement enquiries, also share clear photographs of the existing relay nameplate, front panel and rear terminal arrangement.
If the Siemens article number is unavailable, share the existing relay model and confirm whether the transformer has two windings, three windings or an autotransformer arrangement.
Siemens SIPROTEC 5 7UT85 Supplier and Exporter in India
ARP IMPEX supplies Siemens SIPROTEC 5 7UT85 Transformer Differential Protection Relays for utilities, EPC contractors, switchgear manufacturers, panel builders, power plants and industrial maintenance companies.
We handle enquiries for:
- Siemens SIPROTEC 5 7UT85 Protection Relays
- Two-winding transformer differential relays
- Three-winding transformer protection relays
- Autotransformer differential protection relays
- Restricted earth-fault protection relays
- Transformer relays with IEC 61850
- Protection relays for utility substations
- Siemens transformer relay replacement
- Transformer protection-panel retrofit requirements
- Siemens 7UT85 price and availability
- Siemens transformer relay export requirements
The Siemens SIPROTEC 7UT85 price depends on the complete article number, transformer configuration, measuring inputs, binary I/O, communication modules and required quantity.
Send the complete Siemens part number, required quantity and destination country for price, availability and export quotation.
