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EMU7

EMU7 – Monitoring and Control Unit of MV Feeders

Unit Description

EMU7 combines a communication unit, measurement, digital inputs and outputs, which together form a functional unit for monitoring and control of medium voltage feeders in electricity distribution substations. Thanks to its compact dimensions and the possibility of installation in the front panels of the cubicles, it is a very versatile and efficient solution with many useful functions that are usually needed for applications in RMUs.

Typical Applications

  • measuring device in connection with low-power sensors,
  • feeder terminal,
  • fault passage indicator,
  • feeder protection
EMU7

Basic Features

  • 3-phase voltage and current measurement on medium voltage feeders, see the HW variants in the tables below,
  • fault indication according to ANSI 27, 46, 47, 50, 50N, 51, 51N, 59, 59N, 67, 67N, 81H, 81L, 81R,
  • network disturbance records in format COMTRADE,
  • 10 × DI, 4 × DO (relay),
  • 2 × independent 10/100 Mbps Ethernet LAN port, VLAN support,
  • HMI – operating values display, local control and setup via buttons,
  • secure communication according to IEC 62351-3 (TLS),
  • web configuration interface HTTP/HTTPS,
  • digitally signed OS and FW,
  • SQL database data storage support,
  • user programmable logic based on standard IEC 61131-3,
  • internal thermal sensor, embedded RTC,
  • panel mounting.

Communication Protocols and Services

IEC 60870-5-101
IEC 60870-5-103
IEC 60870-5-104
IEC 61850 (GOOSE, MMS)
DNP3.0
Modbus TCP/RTU
DLMS
OPC UA
SQL
HTTPS
HioCom2
SNMP
IPSec
OpenVPN
Firewall
NAT
PRP/HSR
NTP
Syslog
SSH
SCEP
RADIUS
RBAC
IEC 62351-3

Technical Specification for Individual HW Variants

Product code
EMU7 S-3U/3.575/4.29/M2-4U/0.225/4.5/M2-DI10-PM-D004-2ETH
Analog voltage inputs
3 inputs 3.575 V AC for low-power voltage sensors, overloadability up to 4.29 V AC (still measured), rated burden 200 kΩ, measurement accuracy ±0.3 % from nominal range, screw terminals
Analog current inputs
3 inputs 225 mV for low-power current sensors, overloadability up to 4.5 V AC (still measured), rated burden 200 kΩ, measurement accuracy ±0.3 % from nominal range, screw terminals
Product code
EMU7 S-3U/25/30V/150p-4I/0.225/4.5V/M2-DI10-PM-D004-2ETH
Analog voltage inputs
3 inputs 25 V AC for parallel connection with voltage indicators (VPIS VO / CAPDIS / WEGA) connected to capacitive output in feeder bushings, overloadability up to 30 V AC (still measured), measurement accuracy ±0.3 % from nominal range, screw terminals
Analog current inputs
3 inputs 225 mV for low-power current sensors, overloadability up to 4.5 V AC (still measured), rated burden 200 kΩ, measurement accuracy ±0.3 % from nominal range, screw terminals
Product code
EMU7 S-3U/4/4.8V/2M-3I/0.225/9V/2M-DI10-PM-D004-2ETH
Analog voltage inputs
3 inputs 4 V AC for low-power voltage sensors according to standard IEC 61869-10, overloadability up to 4.8 V AC (still measured), rated burden 2 MΩ, measurement accuracy ±0.3 % from nominal range, connector RJ-45
Analog current inputs
3 inputs 225 mV for low-power current sensors according to standard IEC 61869-11, overloadability up to 9 V AC (still measured), rated burden 2 MΩ, measurement accuracy ±0.3 % from nominal range, connector RJ-45

Technical Specification of Common Features

Power supply voltage
10 ÷ 60 V DC (max. 10 W), isolated from other unit parts, SMD fuse
Communication ports
2 × metallic Ethernet 10/100 Mbps, isolation 1.5 kV AC / 1 min.
Digital inputs
10 × passive (wet contact) input 24 V DC, two groups with common terminal, nominal input current 4.1 mA
Digital outputs
4 × relay, two groups with common terminal, outputs resistive load 6 A / 250 V AC, 6 A / 30 V DC
Analog inputs
24-bit A/D conversion
HMI
OLED display, 5 buttons
Wire cross-section
0.08 ÷ 1.3 mm²
Operating temperature
-25 °C ÷ +70 °C
Storage temperature
-30 °C ÷ +75 °C
Ambient relative humidity
≤ 95 % non-condensing
Dimensions
96 × 48 × 120 mm (W × H × D)
Mounting hole dimensions
92 × 45 mm (W × H)
Ingress protection
IP20 (IP54 for front panel)
Compact RTU
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