Siemens SIPROTEC 5 7UT87 Transformer Differential Relay
The SIPROTEC 7UT87 Differential Protection Relay is part of the advanced SIPROTEC 5 family, designed specifically for transformer differential protection in modern power systems. This high-performance device supports 20xI current inputs and 4xV voltage inputs, offering exceptional scalability with expandable hardware.
It is engineered to protect multi-winding transformers with up to 10 sides and 10 measuring points, making it the ideal choice for complex transformer configurations and large-scale installations.
Built with cutting-edge Siemens protection technology, the SIPROTEC 7UT87 Differential Protection Relay ensures fast fault detection, accurate tripping, and secure power continuity. It helps utilities and industries achieve maximum reliability by minimizing downtime and preventing transformer damage. With its modular design, it also offers seamless integration into existing systems, while providing future-ready scalability.
For customers in Mumbai, we provide authentic SIPROTEC 7UT87 Differential Protection Relays with reliable after-sales support, technical consultation, and competitive pricing. Whether you are a power utility, industrial plant, EPC contractor, or panel builder, this relay delivers the protection, performance, and trust you need.
Features
Main function:
- Up to 3 differential protection functions with additional stabilization (in different transformer function groups); up to 5 ground fault differential protection functions. For auto transformer applications, two differential protection functions can be processed in an Auto transformer function group.
Usable measuring points:
- 9 x 3-phase current measuring points
- 5 x 1- phase current measuring points
- 5 x 3-phase voltage measuring points
Inputs and outputs:
2 predefined standard variants with
- 20 current transformers
- 4 voltage transformers
- 15 to 27 binary inputs
- 22 to 38 binary outputs
Hardware flexibility:
- Flexibly adjustable and expandable I/O quantity structure within the scope of the SIPROTEC 5 modular system.
Width of housing:
- 2/3 × 19 inches to 2/1 × 19 inches
Application
The SIPROTEC 7UT87 is intended for special applications (up to 5 sides and 7 measuring points), therefore, you must create your own application template depending on the application and store it in the device. To make work easier, you can use an available template and modify it.
Example:
Auto transformer with stabilizing winding in breaker-and-a-half layout
- Differential protection for the complete transformer (auto transformer winding + stabilizing winding)
- Nodal point protection for the auto winding for recording ground faults (3-phase recording of the neutral-point current)
- Overload protection, backup protection for the downstream power system
- Circuit-breaker failure protection
- Frequency and voltage protection on the upper-voltage side.
Choose the SIPROTEC 5 7UT87 Differential Protection Relay to secure your multi-winding transformers with precision, durability, and proven Siemens quality.
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