Siemens SIPROTEC 5 7UT86 Transformer Differential Relay
The SIPROTEC 7UT86 Differential Protection Relay from Siemens is a reliable and advanced solution for transformer protection in demanding power system applications. Designed as part of the SIPROTEC 5 series, this relay ensures comprehensive differential protection for 3- or 4-winding transformers, supporting up to 7 measuring points with its expandable hardware configuration (12xI / 4xV).
Built for modern power networks, the SIPROTEC 7UT86 Transformer Differential Protection Relay offers precise fault detection, flexible hardware scalability, and robust system integration, making it ideal for power plants, substations, and industrial installations. Its advanced protection functions safeguard transformers from internal faults, winding short circuits, and phase-to-phase issues, ensuring maximum reliability and operational continuity.
In Mumbai, we are a trusted supplier and distributor of Siemens SIPROTEC 7UT86 Differential Protection Relay, providing authentic relays with complete technical support. Customers benefit from:
- Genuine Siemens SIPROTEC 5 relays with manufacturer warranty
- Best price in Mumbai with competitive quotes for bulk orders
- Fast delivery & local availability to reduce downtime
- Expert technical assistance for installation and configuration
Main function:
- 1 differential protection function (standard) with additional stabilization; up to 3 restricted ground-fault protection functions
- For auto transformer applications 2 differential protection functions can be processed in an auto transformer function group.
Useable measuring points:
- 6 x 3-phase current measuring points,
- 4 x 1- phase current measuring points,
- 4 x 3-phase voltage measuring points;
- expandable to 4 sides
Inputs and outputs:
2 predefined standard variants with
- 12 current transformers
- 4 voltage transformers,
- 11 to 23 binary inputs,
- 18 to 34 binary outputs
Hardware flexibility:
- Flexibly adjustable and expandable I/O quantity structure within the scope of the SIPROTEC 5 modular system.
Width of housing:
- 1/2 × 19 inches to 2/1 × 19 inches
Application
Application templates are available in DIGSI 5 for standard applications. They contain basic configurations and default settings. These can be used directly or as a template for application- related adaptation. The available measuring points make varied applications possible. Prior to ordering a device, please configure the application with DIGSI 5. Table “Functions and application templates” shows the functional scope of the device. Use the configurator to determine the necessary function points.
Examples:
Three-winding transformer basis
- Differential protection
Auto transformer with stabilizing winding
- Differential protection for the complete transformer (auto transformer winding + stabilizing winding)
- Restricted ground-fault protection (neutral point + maximum side current)
- Overload protection, backup protection for the downstream power system
- Circuit-breaker failure protection
Three-winding transformer in breaker-and-a-half layout
- Differential protection
- Restricted ground-fault protection on the neutral side
- Ground-current protection on the neutral side as backup protection for the electrical power system
- Overload protection
- Circuit-breaker failure protection
- Frequency and voltage protection on the neutral side
Whether you are an engineer seeking technical specifications or a procurement manager looking for reliable suppliers in Mumbai, the SIPROTEC 5 7UT86 offers the perfect balance of performance, scalability, and cost-effectiveness.
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