The Merging Unit is the modular and interoperable solution between primary and secondary technology for process bus solutions conforming to IEC 61869 and IEC 61850-9-2.

Measured values of conventional and non-conventional transformers are converted in the merging unit into standardized, Ethernet-based telegrams (SMV).

Applications

Merging Unit for

• Analog and digital feeder values
• Central merging unit for the process data acquisition of a transformer
• Central Protection
• Bay units for distributed busbar protection
• Fault Recorder for process bus
• Centralized Synchrocheck

Features

• Sampled measured values (SMV) Streams (up to 8 streams per device)
  • Up to 32 analog values in any combination of CTs and VTs
  • 4x CTs, 4x VTs (IEC 61850-9-2 LE)
• Sampled measured values (SMV) IEC 61869-9, IEC 61850-9-2 and IEC 61850-9-2 LE
• Direct “high speed” tripping of circuit breaker < 1 ms
• Collection of additional data (temperature, pressure, tap changer positions, …)
• Reliable and redundant data transmission via PRP and HSR protocol (up to a cable length of 24km)
• IEC 61869-9, IEC 61869-13 compliant
• IEC 61850-8-1 GOOSE, MMS and IEC 61850-9-2 protocol on the same Ethernet module
• Sample and date/time synchronization via IEEE 1588v2/PTP with enhanced stability against GNSS loss
• Optional or retrofittable “high speed” contacts for direct and instantaneous tripping of the circuit breaker < 1 ms (depending on the application)
• Optional or retrofittable connection of further sensors for the acquisition of additional data such as temperature, pressure, tap changer position of a transformer, ...), interfaces to be supported
  • 4 to 20 mA
  • PT100 (RTD)
  • BCD code
• Ruggedized design and conformal coated electronical boards for high electric strength and installations in harsh environments - as standard
• Redundant power supply optional
• Large process data range (up to 40 current and voltage transformers; more than 200 inputs and outputs for recording applications possible)
• Easy integration and retrofit of arc protection, transient ground-fault detection, transformer control and PMU for efficient network operation
• Optional arc protection with a tripping time of 3-4 ms for protection of assets and personal – Safety first
• Operation panel that is freely selectable for all device types (for example, large or small display, with or without key switches, detached operation panel)
• Graphical logic editor to create powerful automation functions and switching sequences in the device according to IEC 61131-3 standard

• Detection of current and voltage signals up to the 50th harmonic with high accuracy for selected protection functions and operational measured values
• Integrated electrical Ethernet RJ45 for Engineering PC and IEC 61850 (reporting and GOOSE)
• Two slots for optional plug-in modules for serial and/or Ethernet-based protocols
• Optional communication module with further 3 slots plug-in modules for serial and/or Ethernet-based protocols and full availability of the communication ring when the switchgear is enabled for servicing operations by means of separate auxiliary power supply of the communication module
• Large number of serial and Ethernet-based protocols: IEC 60870-5-103, DNP3 serial and TCP, Modbus TCP, IEC 60870-5-104, PROFINET, PROFINET IO S2 redundancy and IEC 61850 Ed1, Ed2.0 and Ed2.1
• Reliable data transmission via Ethernet redundancy protocols PRP and HSR for process bus and PRP and HSR for high-availability station communication
• IoT interface for integration in cloud-based systems
• Serial protection data communication via optical fibers, two- wire connections and communication networks (SDH networks, MPLS electrical power systems, for example using IEEE C37.94, and others), including automatic switchover between ring and chain topology.
• Powerful fault recording (buffer for a max. record time of 80 sec. at 8 kHz or 320 sec. at 2 kHz)
• Easy, fast and secure access to device via Web-Browser from the device: Download of logs as files according to IEEE C37.239 COMFEDE with https connection

Fault recording: Download, delete and triggering of fault records

Displaying of Single line diagrams and device display pages, indications,

vector diagrams of energizing quantities

Parameterization: Change of settings within an active setting-group

• Optional Phasor Measurement Unit (PMU) for detection of Synchrophasor measured values and transmission with standard IEEE C37.118 protocol
• Optional Point-On-Wave Switching for minimizing electro-dynamic and dielectric stress for operational equipment
• Role-based Access Control (RBAC) with central user management in RADIUS/Active Directory
• Protection against unauthorized access to device through inbuilt RADIUS authentication and authorization option
• Standard roles and rights in adherence to standards and guidelines such as IEC 62351-8, IEEE 1686 and BDEW White paper
• Syslog support for central recording and logging of security-relevant events and alarms in accordance with the requirements and regulations such as IEEE 1686, IEC 62443 and BDEW Whitepaper
• Virtual network sharing (IEEE 802.1Q – VLAN)
• Individual Assignment of write and read permission for each device port
• Auxiliary functions for simple tests and commissioning

Housing

Robust hardware in the form of a closed housing for maximum strength in terms of voltage, EMC, climate and mechanical stress in accordance with the IEC 60255 product standard and an extended temperature range of -40°C to + 70°C.

Additional conformal coating of the electronic components for maximum availability even under extreme environmental conditions

Housing width 1/3 x 19 inches to 2/1 x 19 inches with large, small or without display. Flexible adjustable and expandable I/O quantity structure within the scope of the system with 1/6 expansion modules.

Type of housing:

X Flush mounting

O Surface mounting

Power Supply:

X Standard

O Redundant

Operation panel:

X Integrated

O Detached HMI, only for surface mounting housing

Type of display:

X No display

O Small Display

O Large Display

Key switch:

X without

O with, only for flush mounting housing

LEDs/Push buttons:

X 16 LEDs

O 32 LED

O 48 LED

O 64 LED

O 80 LED

O 8 Push buttons + LEDs

Binary inputs and outputs / measuring inputs

The number of inputs and outputs is flexible and expandable with 1/6 expansion modules plugged on the 1/3 base unit of a modular system.

O 11 BI, 9 BO, 4 CT, 1/3 x 19 inches

X 11 BI, 9 BO, 4 CT, 4 VT, 1/3 x 19 inches

O 7 BI, 7 BO, 8 CT, 1/3 x 19 inches

O 7 BI, 7 BO, 8 CT, 1/3 x 19 inches

O 3 BI, 3 BO, 4 RoGo, 4 CVS, 1/3 x 19 inches

Rated auxiliary voltage

O DC 60 to 125 V DC

X DC 110 V-250 V, AC 100V - 230 V

Communication

The base unit has two free slots on the rear for plug-in modules for communication or special applications. The base unit is expandable with a communication module with up to three further slots for plug-in modules.

• USB operator interface on the front for notebook or PC
• D-Sub 9-interface, rear for time synchronization
• Integrated Ethernet interface
  X for Engineering Tool
  O for Engineering Tool and IEC 61850 Reporting and GOOSE
  O for Engineering Tool and IEC 61850 Reporting
• Communication module, max 1 for each device with additional 3 slots plug-in modules for serial and/or Ethernet-based protocols and full availability of the communication ring when the switchgear is enabled for servicing operations by means of separate auxiliary power supply of the communication module
  X without
  O with one communication module for up to three additional plug-in modules
• Serial Plug-In modules for asynchronous serial protocols like IEC 60870-5-103, DNP for system port
  X Without
  O electrical, 1 interface
  O electrical, 2 interfaces
  O optical 820 nm, 1.5 to 2km ,1 interface
  O optical 820 nm, 1.5 km to 2km, 2 interfaces
• Serial Plug-in modules for protection interface for unidirectional data exchange

X without
O optical 1300 nm, max. 24 km via 2 single mode optical fibers or
  max. 4 km via 2 multimode optical fibers, 1 interface
O optical 1300 nm, max. 24 km via 2 single mode optical fibers or max. 4 km
  via 2 multimode optical fibers, 2 interface
O optical 1300 nm, max. 60 km via single mode optical fiber, 1 interface
O optical 1300 nm, 60 km via single mode optical fiber, 2 interface
O optical 1550nm, 100 km via single mode optical fiber, 1 interface
O optical 1550nm, 100 km via single mode optical fiber , 2 interface

• Serial Plug-in modules for protection interface for bidirectional data exchange
  O without

O optical 1300 nm, max. 40 km via one single- mode optical fiber

  (with integrated fiber-optic multiplexer, 1 interface)
O optical 1300 nm, max. 40 km via one single- mode optical fiber

  (with integrated fiber-optic multiplexer, 2 interface)

O optical 1550 nm, max. 40 km via one single- mode optical fiber

  (with integrated fiber-optic multiplexer, 1 interface)
O optical 1550 nm, max. 40 km via one single- mode optical fiber

  (with integrated fiber-optic multiplexer, 2 interface)

• Plug-in Modules for Ethernet

O Without

O 2x RJ45 electrical, configurable with or without integrated switch

  with max. distance of 20 meters
O 2x optical duplex LC 1300 nm interface, configurable with or without

  integrated switch. The maximum optically permitted distance via 50/125 µm

  or 62.5/125 µm multimode optical fibers is 2 km.

X 2x optical for process bus, duplex LC 1300 nm interface, configurable with

  or without integrated switch. The maximum optically permitted distance

  via 50/125 µm or 62.5/125 µm multimode optical fibers for up to 2 km.

O 2x optical for process bus, duplex LC 1300 nm interface, configurable with

  or without integrated switch. The maximum optically permitted distance

  via 50/125 µm or 62.5/125 µm multimode optical fibers for up to 24 km.

The optical transmission and receiving level are measured in the module and  

can be displayed.

In accordance with the selected communication interface the required communication protocol should be easily activated via the engineering tool depending on the selected type of serial or Ethernet plug-in module

• Serial protocols
  IEC 60870-5-103
  DNP3 serial
• Ethernet protocols

IEC 61850 Edition 2.1
IEC 61850-8-1 Client-Sever Communication

IEC 61850-8-1 GOOSE

IEC 61850-9-2 Merging Unit

IEC 61850-9-2 Process-Bus Client
IEC 60870-5-104
DNP3 TCP
Modbus TCP
PROFINET IO

PROFINET IO S2 redundancy
IEEE C37.118 protocol (Synchrophasor, PMU)

• Additional Ethernet protocols and services
  DHCP, DCP (with automatic IP configuration)

Line mode
RSTP, PRP, HSR Ethernet ring redundancy

SNTP time synchronization via Ethernet

SNMP V3 network management protocol

IEEE 1588v2 PTP protocol via Ethernet

Plug-in modules for various applications
O Measuring-transducer module with four 20-mA analog inputs
O Arc protection module with up to 3 optical point or line sensors per

  arc protection plug-in module, up to max. 15 sensors for modular devices

  X Point sensors with line lengths from 3 m to 35 m.

  O Line sensors detect arcs along the entire sensor length.

    Lengths from 5 m to 40 m are available.

    Line sensors are connected via a line to the arc protection module.

Functionality

The merging unit is equipped with the following functions:

X Basic functions

• IEC 61850-9-2 Merging Unit stream (2x) (MU)
  Note: Dedicated Ethernet plug-in module for process bus required
• Temperature Supervision (38)
• Instantaneous tripping at switch onto fault SOTF
• Trip-circuit supervision (74TC)
• Lockout (86)

• Measured values
• Basic PQ measurements: THD and harmonics, THD voltage aggregation values
• Switching-statistic counters
• Logic editor
• Inrush-current detection
• External trip initiation
• Control
• Monitoring and supervision
• Fault recording of analog and binary signals
• Frequency tracking groups
• Temperature acquisition via communication

Optional functions

O Process Bus Client Protocol, max 1(PB Client)

  Note: Dedicated Ethernet plug-in module for process bus required

O Additional IEC 61850-9-2 Merging Unit stream, (max. 8 in total) (MU)
Note: Dedicated Ethernet plug-in module for process bus required

O Synchrocheck, synchronizing function (25)

O Undervoltage protection: "3-phase" or "positive-sequence V2” or “positive-sequence system V1” or “universal Vx" (27)

O Rate-of-voltage-change protection (27R/59R)

O Overvoltage protection: "negative-sequence V2" or "negative-sequence V2/positive-sequence V1” (47)

O Overcurrent protection, phases (50/51 TD)

O Overcurrent protection, ground (50N/51N TD)

O Circuit Break-breaker failure protection 3- pole (50BF)

O Circuit Break-breaker failure protection 1-/3- pole (50BF)

O End-fault protection (Note: only usable for distributed busbar protection)

O Circuit Break-breaker restrike protection (50RS)

O Overvoltage protection "3-phase" or “zero-sequence system V0” or "universal Vx"(59, 59N)

O Directional overcurrent protection, phases (67)

O Directional overcurrent protection, ground (67N)

O Closed-circuit supervision (74CC)

O Automatic reclosing, 3-pole

O Automatic reclosing, 1-/3-pole

O Automatic voltage control (90V)

O Synchrophasor measurement (PMU)

O Measured values extended: min, max, average

O PQ-Basic measured values: voltage unbalance

O PQ-Basic measured values: voltage variations – voltage dips, swells and interruptions

P PQ-Basic measured values_ TDD – Total Demand Distortion

O Circuit Breaker wear monitoring

O Switching sequences function

O Point-on-Wave Switching (PoW)

O Cyber Security: Role Base Access Control (RBAC)

O Cyber Security: IEEE 802.1x based network authentication