Siemens SIPROTEC 5 7UT87 Multi-Winding Transformer Differential Protection Relay
Siemens SIPROTEC 5 7UT87 Multi-Winding Transformer Differential Protection Relay Suppliers,Exporters in India
ARP IMPEX is a supplier and exporter of Siemens SIPROTEC 5 7UT87 Multi-Winding Transformer Differential Protection Relays in India. We handle requirements for complex transformer protection panels, utility substations, power plants, HVDC projects, industrial power systems and replacement of existing Siemens relays.
The Siemens SIPROTEC 7UT87 is designed for transformers with multiple windings and a large number of current-measuring points. It can protect transformers with up to five sides, making it suitable for schemes where a standard two-winding or three-winding transformer relay does not provide enough measuring inputs or protection flexibility.
The 7UT87 works as the main differential protection for the transformer. It detects internal faults while remaining stable during transformer energisation, external faults and current-transformer saturation. It can adapt to different transformer vector groups and transformer tap positions, which is important in large and special transformer applications.
The relay is commonly selected for phase-shifting transformers, converter transformers, arc-furnace transformers, FACTS transformers and HVDC transformer applications. It can also protect multiple parallel transformers through one suitably configured device.
Depending on the ordered configuration, the relay can provide up to three transformer differential protection functions and up to five ground-fault differential protection functions. Additional functions can cover short cables, lines, shunt reactors and backup protection duties.
The SIPROTEC 5 modular hardware allows the current inputs, voltage inputs, binary contacts and communication modules to be selected according to the transformer scheme. Siemens DIGSI 5 is used for settings, logic, testing and commissioning. IEC 61850 and other communication options are available for connection with SCADA, station-control and digital substation systems.
For the Siemens SIPROTEC 7UT87 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: 7UT87
- Product type: Multi-winding transformer differential protection relay
- Main application: Protection of transformers with multiple windings
- Transformer arrangement: Supports applications with up to five protected sides
- Differential protection: Up to three transformer differential functions
- Ground-fault differential protection: Up to five functions
- Standard current inputs: 20 CT inputs in predefined hardware variants
- Standard voltage inputs: Four VT inputs in predefined variants
- Binary inputs: 15 to 27, depending on the hardware version
- Binary outputs: 22 to 38, depending on the hardware version
- I/O expansion: Expandable through the SIPROTEC 5 modular system
- Communication: Up to four plug-in communication modules
- Engineering software: Siemens DIGSI 5
- IEC 61850: Available for substation communication and system integration
- Control functions: Transformer control, alarms and programmable interlocking
- Recording: Event, fault and disturbance records
- Construction: Modular hardware with coated electronic modules
- Housing size: Depends on the selected input and output arrangement
The exact measuring inputs, binary contacts, housing width, communication protocols and enabled protection functions depend on the complete Siemens MLFB or article number.
Main Protection Functions
Depending on the selected configuration, the Siemens SIPROTEC 7UT87 can provide:
- Multi-winding transformer differential protection
- Differential protection for transformers with up to five sides
- Autotransformer differential protection
- Ground-fault and restricted earth-fault differential protection
- Transformer inrush restraint
- Overexcitation supervision
- Transformer vector-group compensation
- Tap-position compensation
- Phase and earth overcurrent backup protection
- Voltage and frequency protection
- Arc protection
- Short cable and line protection
- Shunt-reactor protection
- Line differential and distance backup functions
- Voltage control for parallel transformers
- Programmable trip, alarm and interlocking logic
The actual protection package must be confirmed based on the ordered configuration. The model name alone does not confirm all enabled functions or communication options.
Features
- Developed for complex multi-winding transformer schemes
- Supports transformer applications with up to five protected sides
- Suitable for transformers requiring a large number of measuring points
- Provides up to three independent transformer differential functions
- Supports several ground-fault differential protection zones
- Can protect parallel transformers through one configured relay
- Inrush restraint prevents unwanted tripping during transformer energisation
- Stable performance during external faults and CT saturation
- Compensates for different transformer vector groups
- Adapts the differential characteristic to the transformer tap position
- Supports standard, autotransformer and special-transformer applications
- Expandable current, voltage and binary I/O arrangement
- Up to four communication modules can be selected
- DIGSI 5 supports configuration, testing and commissioning
- IEC 61850 supports modern substation automation systems
- Programmable logic supports alarms, tripping and interlocking
- Fault and disturbance records assist with transformer-trip analysis
- Coated electronic modules suit demanding substation environments
- Suitable for new installations, protection upgrades and relay replacement
The 7UT87 is the larger and more flexible option within the SIPROTEC 7UT range. It is normally considered when the transformer scheme has more windings, more measuring points or more protection zones than a 7UT85 or 7UT86 can cover.
Applications
Siemens SIPROTEC 5 7UT87 Transformer Differential Protection Relays are used for:
- Multi-winding power transformers
- Transformers with up to five protected sides
- Large autotransformers
- Phase-shifting transformers
- Converter transformers
- HVDC converter transformers
- FACTS transformer applications
- Electric arc-furnace transformers
- Grid-coupling transformers
- Multiple parallel transformers
- Utility transmission substations
- Extra-high-voltage substations
- Power-generation substations
- Renewable-energy grid connection projects
- Large industrial substations
- Short cable and line protection
- Shunt-reactor protection
- Transformer voltage-control schemes
- Transformer protection-panel upgrades
- Replacement of older Siemens differential relays
The SIPROTEC 7UT87 is particularly relevant for complex transformer protection projects where several differential zones, numerous CT inputs and flexible communication options must be combined in one platform.
Selecting the Correct Siemens 7UT87 Relay
“Siemens SIPROTEC 7UT87” does not identify one fixed relay configuration. The number of current and voltage inputs, binary contacts, communication modules, housing width 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 the transformer arrangement, such as the number of windings, protected sides and differential protection zones.
Siemens SIPROTEC 5 7UT87 Supplier and Exporter in India
ARP IMPEX supplies Siemens SIPROTEC 5 7UT87 Multi-Winding 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 7UT87 Protection Relays
- Multi-winding transformer differential relays
- Five-side transformer protection relays
- Special-transformer protection relays
- HVDC transformer differential protection relays
- Phase-shifting transformer protection relays
- Converter transformer protection relays
- Transformer relays with IEC 61850
- Siemens transformer relay replacement
- Transformer protection-panel retrofit projects
- Siemens 7UT87 price and availability
- Siemens transformer protection relay export requirements
The Siemens SIPROTEC 7UT87 price depends on the complete article number, transformer arrangement, number of measuring points, binary I/O, communication modules and ordered quantity.
Send the complete Siemens part number, required quantity and destination country for price, availability and export quotation.
