7SR105 – Rho Motor protection relay

Product catalog summary

Introduction
The 7SR105 Rho motor protection relay is a state-of-the-art device designed for motor protection applications. It integrates advanced hardware technology to offer protection, monitoring, instrumentation, and metering capabilities.

Specifications
The relay is housed in a 4U high, size 4 non draw-out case. It features 4 current transformers (CT), 6 AC/DC binary inputs, 6 binary outputs, and 9 tri-color programmable LEDs. The device includes a 4-line by 20-character LCD display and supports 6 RTD inputs (optional). Communication is facilitated through a front USB port and a rear RS485 port, supporting protocols such as IEC60870-5-103, DNP3.0, and Modbus RTU.

Protection Functions
The relay offers a comprehensive range of protection functions including:

Stall Protection (14)
Phase Unbalance Protection (46)
Thermal Overload (49)
Start Protection (48/66)
Undercurrent (37)
Instantaneous Overcurrent Protection (50)
Instantaneous Earth Fault (50N/G)
Time Delayed Overcurrent Protection (51)
Time Delayed Derived/Measured Earth Fault Protection (51N/G)
Phase Reversal (46PhRev)
Breaking Capacity Limit (50BCL)
Circuit Breaker Fail (50BF)
Trip and Close Circuit Supervision (74 T/CCS)
Anti Backspin (81B)
Lockout (86)

Control and Feature Functions
The relay includes motor start/stop control, user programmable logic, and CG Open/CB Closed fascia key control. It supports two settings groups and offers password protection with two levels. Additional features include self-monitoring, a circuit breaker trip and maintenance counter, and trip timers.

Supervision Functions
The relay's functionality is dependent on external connections, with some functions being mutually exclusive.

Contact Information
For inquiries, contact Siemens Protection Devices Limited at their UK office or through their customer support center.

Note
The document specifies that the information provided is subject to changes and errors, and performance features are binding only when expressly agreed upon in a contract.

Catalog excerpts

Protecting your electrical assets... today and tomorrow The 7SR105 Rho motor protection relay is developed by using the latest generation of hardware technology. The device is housed in a 4U high, size 4 non draw-out case and these relays provide protection, monitoring, instrumentation, and metering with integrated input and output logic, data logging and fault reports. Communication access to the relay functionality is via a front USB port for local PC connection or rear electrical RS485 port for remote connection. 7SR105 Rho motor protection relay is a numerical protection relay intended for use in the motor protection applications. It provides a highly comprehensive functional software package with a range of integral application functions aimed at reducing installation, wiring, and engineering time. A wide range of measured values can be viewed on the front LCD or remotely via the communications channel. The integrated control feature allows the safe operation of a motor and monitoring its start and stop operations. Key Features ■ 4 CT - 6 AC/DC Binary Inputs/6 Binary Outputs, 9 Tri Color Programmable LEDs ■ LCD 4 Line x 20 Characters ■ 6 RTD Input (Optional) ■ Front USB port + Rear RS485 port ■ Protocols - IEC60870-5-103, DNP3.0 or Modbus RTU

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NOTE: The use of functionality is dependent on external connections to the relay i.e. some functions are mutually exclusive Control functions Stall Protection Phase Unbalance Protection ¡ otor Start / Stop Control M Thermal Overload Start Protection ¡ G Open / CB Closed fascia key control C Instantaneous Overcurrent Protection Instantaneous Earth Fault Time Delayed Overcurrent Protection T ime Delayed Derived/Measured Earth Fault Protection Feature functions ¡ wo Settings Groups T ¡ assword Protection – 2 levels P ¡ ser Programmable Logic U ¡ elf Monitoring S Supervision functions ¡ ircuit Breaker...

Open the catalog to page 2