Siemens Siprotec 5 6MU85 Merging unit

The new Siemens SIPROTEC 6MU85 Merging Unit, based on the flexible SIPROTEC 5 protection and control system, supports both conventional and non-conventional instrument transformers (LPITs). As a result, it digitalizes all primary data close to the process level for faster and more reliable data transmission.

Moreover, the SIPROTEC 5 Process Bus delivers versatile solutions and smooth migration concepts, enabling utilities to upgrade both new and existing substation systems efficiently.

Features

Main functions:

• Merging unit
• Bay unit for distributes busbur protection SIPROTEC 7SS85
• Breaker functions
• Backup protection functions
• Additional functions

Communication:

• Up to 4 sampled measured value streams according to IEC 61850-9-2 LE or IEC 61869 flexible streams

Hardware flexibility:

• Flexibly adjustable and expandable I/O quantity structure within the scope of the modular SIPROTEC 5 system. Moreover, 1/6 expansion modules can be added.

Housing width:

• 1/3 × 19 inches to 2/1 × 19 inches

As standard:

• Conformal coating

Functions

Merging unit

• Per ETH-BD-2FO Ethernet module 1 or 2 (in preparation) Sampled Measured Value (SMV) streams
• – up to 32 analog values in any combination of CTs and VTs
  or
  – 4x CTs, 4x VTs (IEC 61850-9-2 LE)
• Up to 4 ETH-BD-2FO modules possible
• Reliable and redundant data transmission via PRP protocol
• IEC 61869-9, IEC 61869-13 compliant
• IEC 61850-8-1 GOOSE, MMS, and merging unit protocol on the same Ethernet module
• Sample and date/time synchronization via IEEE 1588v2/PTP
• Redundant power supply
• Extended temperature range (-40 ºC to 70 ºC)

Merging unit functionality is also available for all modular SIPROTEC 5 protection devices.

Breaker functions

• Control with switchgear interlocking
• Circuit-breaker failure protection (50BF)
• Circuit-breaker wear monitoring
• Switching statistics
• Point on wave switching (PoW)
• Trip-circuit supervision (74TC)
• Automatic reclosing (79)
• Synchrocheck (25)

Backup protection functions

• Non-directional overcurrent protection (50/51, 50N/51N)
• Directional overcurrent protection (67/67N)
• Overvoltage and undervoltage protection (27/59)

Additional functions

• Phasor measurement unit (PMU) for synchrophasor measured values and IEEE C37.118 protocol
• Arc protection
• Auxiliary functions for simple tests and commissioning
• Temperature measurement via thermobox TR1200 (7XV5662-6AD10 or 7XV5662-8AD10)
• 4-20 mA transducer inputs for various analog process values, e.g., pressure, tap-changer position

Communication

• Pluggable communication modules, usable for different and redundant protocols (IEC 61850-8-1, IEC 61850-9-2, IEC 60870-5-103, IEC 60870-5-104, Modbus TCP, DNP3 serial and TCP, PROFINET IO)
• Serial protection data communication via optical fibers, two-wire connections, and communication networks (IEEE C37.94, and others), including automatic switchover between ring and chain topology
• Extensive cybersecurity functionality, such as role-based access control (RBAC), protocol security-related events, or signed firmware
• Simple, quick, and secure access to device data. Specifically, via a standard Web browser – without additional software

SIPROTEC 5 is part of the new generation of incomparable modular, flexible, and intelligent digital field devices.  Additionally, with modularly designed hardware and software and its high-performance DIGSI 5 engineering tool. Consequently, the SIPROTEC 5 product family of field devices is perfect for protection, control, monitoring, and measuring applications in electrical energy systems. SIPROTEC 5 offers a wide product range with modular elements. Specifically, for every application and requirement.