GE

Grid Solutions

Reason MU320
Extended Version
Analog and digital, fast and accurate:
Process Interface Unit for Digital Substations High I/O Density & Flexibility
MU320E is the Process Interface Unit (PIU) with analog and binary interfaces for full switchyard • MU320E stands as a ½ 19” and low
modelling, control and digitalization using IEC 61850 standards and protocols such as Sampled depth device, perfect to be placed in
Values (SV) and GOOSE. enclosure kiosks in the yard.

The MU320E unlocks the full value of a completely digital substation, acting as the I/O interface • Up to 6 flexible slots for Analog and
to every bay IED, particularly for protective relays and bay control units. Limiting the field wiring Binary I/O.
just up to the MU320E reduces project complexity by reducing cabling and physical connections. • Up to 16 Analog Inputs 8CT/8VT.
Bay IEDs can use data from redundant MU320E units, increasing system availability. Bay IEDs • Several combination options up to 96
can also be quickly replaced as no field wiring is involved. The MU320E has the additional benefit Binary Inputs or up 48 Binary outputs.
of improving CT performance and cost through a lower connected burden and a reduction in the
• A single box for Metering and Protection
number of CT cores required for an application.
purposes.

Key Benefits
Switchyard Interface
• Compact form factor supports field installation options into circuit breakers cabinets,
marshalling kiosks and metal-clad switchgear.
• IEC61850 dedicated data modelling for
• 6 slots for I/O cards allows multiple applications. Apply as Merging Unit, Remote I/O device or Circuit Breakers, Circuit Switches and
PIU. Right size and point count for all type of application. Current and Voltage Transformers.
• Card slots for 2 CT/VT analog boards supports application on breaker-and-a-half lines, dual • Simple interface to connect Binary
distribution feeders, and combination protection and metering installations. I/O and GOOSE points to Switchyard
• Optional metering accuracy CT/VT analog board for revenue metering and power quality devices data model.
applications.
• 2 SV streams possible (one per CT/VT analog board). Each stream can be protection (80 s/c) or IEC 61850 Edition 2 & Test
power quality (256 s/c) SV streams. mode
• Full integration into the digital substation through 2 Ethernet ports, support for Parallel
Redundancy Protocol (PRP) high availability networks, and IEEE 1588 Precision Time Protocol. • Operation modes On, Test, Blocked,
• Full IEC 61850 Edition 2, including support for Test mode and Simulation. Multiple logical Test/Blocked and Off
devices to integrate multiple circuit breakers and disconnectors in one MU320E. • Operation modes independently
configurable per Logical Device (LD)
Applications
• Process Interface Unit for full bay digitization.
Ease-of-Use
• Standalone Merging Unit for conventional instrument transformers.
• Remote I/O (RIO) device for interfacing to primary equipment such as circuit breakers and • Clean, simple and functional IED
disconnectors. Configurator Tool (ICT)
• Bay unit for GE B30X distributed bus bar protection system. • Software configurable binary input
voltage level
• Revenue accuracy and power quality metering applications.
• Intuitive IEC 61113-3 based logic.
• Breaker-and-a-half line terminals using a single PIU device.
• Two feeders in a single PIU device.
 PROCESS
INTERFACE UNIT

REMOTE I/O

SEPARATE
MU AND RIO

Flexibility Furthermore, measurements of each CT/VT set may be broadcasted

in protection and measurement profiles, allowing multiple protection,
By integrating binary inputs, outputs and analogue connections into
automation and control applications. Covering the gap between
one box, the MU320E offers a cost-effective solution for a multitude of
conventional and digital substations serves to future-proof substation
bay configurations. Up to two buses and two lines may be monitored
technologies.
per box with a flexible configuration of up to 96 binary inputs or 48
binary outputs
Test Modes
Future Proof and Interoperable IEC 61850 edition 2 provides standard mechanisms for testing
purposes, reducing commissioning complexity and allowing new bay
The MU320E complies with the IEC 61850-9-2 Light Edition (LE)
installations without affecting substation operation.
implementation guideline, which guarantees its interoperability.
This was tested and approved by the global testing and certification MU320E is fully compatible to IEC 61850 ed. 2 allowing users
company TUV SUD according to the Implementation Guideline for to independently configure mode and behavior of each logical
Digital Interfaces to Instrument Transformers. devicesallowing then to operate as: On, Test, Blocked, Test/Blocked
and Off.

GEGridSolutions.com 2
A safer substation Switchyard modelling and digitization
Transmitting the instrument transformers´ measurements digitally The Process Interface Unit MU320E stands as the device responsible
through optical fibers eliminates the risk of inadvertent mishandling to be the physical to digital interface for primary equipment, including
of the current and voltage circuits and makes the relay room a safer the possibility to represent them through the IEC 61850-7-4 data
work environment, eliminating hazards and reducing the risk of model, in a way that the MU320E becomes the extension of the CT/
personnel injury. VT, circuit breakers and disconnectors through the logical nodes TCTR,
TVTR, XCBR and XSWI.
Reduce the engineering effort and cost Through simple user interface IEC 61113-3 based logic it is possible
The use of Process Bus with the MU320E drastically reduces the need to connect MU320E physical and digital inputs to its data model and
for trenches, ducts, glands, cable trays and copper hardwiring, as the digital outputs, allowing the true Switchyard digitization.
information is exchanged among IEDs using fiber optic cables and
ethernet switches.
Fewer cables to manage also means reduced engineering complexity
as extensive wiring schematics are replaced by standardized
version-controlled configuration files. Future reconfigurations are
automatically documented by the IED configuration tool.

Example application of IEC 61850 Architecture

Improved Reliability
Power systems applications are mission critical systems, where the industry standard is to offer inherent redundancy in the schemes applied. The
Reason MU320E provides unsurpassed reliability, as a flexible, redundant solution. The Ethernet connections support the IEC standard Parallel
Redundancy Protocol (PRP), where a redundant star-connected topology allows zero-time - or bumpless – recovery. The shallow case design makes
it easy to deploy MU320E in main and backup, or dual main applications, each connected to different cores of the line CTs and individual protection.
MU320 is the first of its class to manage both PRP redundancy and IEEE 1588 PTP operating together in the substation architecture. Profit from a
single redundant network for higher reliability in communication and synchronization simultaneously.

Functions and IEC61850 data modeling

One of the main advances brought by IEC 61850 is the way it allows the IEDs to standardize their model through elements such as Logical Nodes
and Control Blocks. The main functions that the MU320E supports in this regard are:

3 GEGridSolutions.com
 LN DESCRIPTION
LTMS Time synchronization supervision

LTIM Local time supervision

LCCH Physical ethernet communication channel supervision

LGOS GOOSE subscription supervision

GGIO Generic Process I/O covering all binary I/O available

SIMG Gas Insulation medium supervision*

SIML Liquid Insulation medium supervision*

XCBR Circuit Breaker modeling – Supervision and operation

XSWI Circuit Switch modeling – Supervision and control

TCTR Current Transformer modelling – Samples available through Sampled Values

TVTR Voltage Transformer modelling – Samples available through Sampled Values

4 GEGridSolutions.com
TECHNICAL SPECIFICATION

Power Supply 110-250 Vdc, 110- 240 Vac In Service Contact

Operating nominal Description Dry contact relay, normally closed
110-250 V dc, 110- 240 V ac
voltage
Switching Voltage 250 V ( AC and DC)
Frequency 50/60 Hz ± 3Hz
Permissible current
Operating voltage 5A
88 - 300 V dc, 88 - 264 V ac continuous
range
Maximum voltage 300 (AC and DC)
Power Consumption MAX 20 VA
Making Capacity 15 A, 4 sec
3 pin: positive (phase), negative (neutral) and
Connector Breaking Capacity 40W Resistive, 25 W/VA L/R = 50ms
ground
Dropout time < 5 ms
Optical Irig-B Input
Burden ~30mA @12V [360mW]
Signal IRIG-B004
Withstand voltages
Wavelength 820 nm 1000V rms
across open contacts
Fiber type Multimode 62.5 / 125 µm Permissible short
30A
ST time value for 0.2s
Connector
- 24 dBm Analog Acquisition
Serial Port Resolution 16 bits
Interface RS232 and RS485 Acquisition rate 80 and 256 ppc
Use Device configuration and software upgrade Group delay < 1.1ms
Bit Rate 115200 bps Bandwidth 1 k Hz
Connector DB9 (female), standard DTE

Current Input
Characteristic Standard Input Standard Input High accuracy Inputs
Nominal Current (In) 5A 1A 1A
Nominal frequency 50/60Hz 50/60Hz 50/60Hz
Current range (rms) 0.25 … 200A 0.05 … 40A 0.005 … 10 A
Range Error Phase Error Range Error Phase Error Range Error Phase Error

0.05In ... 0.2In < ± 4% rd < ± 90’ (± 1.5°) 0.05In ... 0.2In < ± 4% rd < ± 90’ (± 1.5°) 0.05In ... 0.2In < ± 0.8% rd < ± 15’ (± 0.25°)

Accuracy 0.2In ... 0.8In < ± 0.75% rd < ± 45’ (± 0.75°) 0.2In ... 0.8In < ± 0.75% rd < ± 45’ (± 0.75°) 0.2In ... 0.8In < ± 0.2% rd < ± 8’ (± 0.15°)

0.8In ... 4In < ± 0.5% rd < ± 30’ (± 0.5°) 0.8In ... 4In < ± 0.5% rd < ± 30’ (± 0.5°) 0.8In ... 4In < ± 0.1% rd < ± 30’ (± 0.1°)

4In ... 40In < ± 1% rd < ± 60’ (± 1.0°) 4In ... 40In < ± 1% rd < ± 60’ (± 1.0°) 4In ... 40In < ± 0.4% rd < ± 60’ (± 0.2°)

Burden In < 0;05VA < 0.01 VA < 0.02 VA

Continuous overload 20A (4 x In) 4A (4 x In) 10 A (10 x In)
AC current thermal
withstand 1 s (Ith 200A (40 x In) 40A (40x In) 20 A (20 x In)
rms)
Insulation > 2.2 kVrms > 2.2 kVrms > 2,2 kVrms
* rd – Indicate errors of reading values

Voltage Inputs
Characteristic Standard Inputs High accuracy Inputs
Nominal Voltage (Vn) 115 V 115 V
Voltage Range 10 – 460V 10 – 230V
Nominal frequency 50/60Hz 50/60Hz
Range Amplitude Error Phase Error Range Amplitude Error Phase Error
Accuracy 0.08Vn ... 2Vn < ± 0.5% rd < ± 20’ (± 0.35°)
0.08Vn ... 2Vn < ± 0.1% rd < ± 5’ (± 0.1°)
2Vn ... 4Vn < ± 1.0% rd < ± 60’ (± 1.0°)
Burden Vn < 0.1VA < 0.1VA
Continuous overload 230 V (2 x Vn) 230 V (2 x Vn)
Maximum overload (1 s) 460 V (4 x Vn) 460 V (4 x Vn)
Insulation > 3,5 kV > 3,5 kV
* rd – Indicate errors of reading values

GEGridSolutions.com 5
Synchronization Breaking Capacity 40 W Resistive, 25 W/VA L/R = 50ms
Accuracy < 1µs Operation time < 5 ms
Drift when not locked ±50PPM (8.64 seconds/day) Dropout time < 15 ms
Max Holdover 60s Per energized output relay: ~30mA @12V
Burden
[360mW]
Environment Conditions Withstand voltages
Operating temperature 1000V rms
-40 °C (-40 °F) … +55°C (+131°F) across open contacts
(continuous)
Permissible short time
Tested as per IEC 30A
–40°C (–40°F) value for 0.2s
60068-2-1:2013
Tested as per
Binary Input
+85°C (+185°F) Nominal Voltage 24 V 48 V 125 V 250 V
IEC 60068-2-2:2013
Level Low 08 V 10 V 40 V 75 V
0 … 95 %, noncondensing
Relative humidity Level High 17 V 19 V 85 V 160 V
- 24 dBm
Burden < 0.05 W < 0.2 W < 0.25 W < 0.5 W
Enclosure Protection IEC 60529
Continuous Overload 80 V 100 V 240 V 340 V
Front flush mounted
with panel
IP40 Dimensions and Weight
Rear and sides IP10 Height 222 mm / 8.7 in (5 U)
Width 222 mm / 8.7 in (½ 19'')
Optical Ethernet Ports
Interface 100BASE-FX Depth 121 mm / 4.7 in

Bitrate 100 Mbps Weight < 3.5 kg (< 7.72 lb)

Wavelength 1300 nm
Connector LC
Fiber type multimode 62.5 / 125 µm
Emission power -20 dBm
Sensitivity -32 dBm
Maximum applicable
-14 dBm
power
Binary Output
Description Dry contact relay. Form-C or Form-A
Switching Voltage 250 V (AC and DC)
Maximum continuous
5A
current
Maximum voltage 300 (AC and DC)
Making Capacity 15 A, 4 sec

Type Test
EMC tests were performed according to IEC 60255-26 referring to the following
IEC 61000-4-2:2008 6kV contact / 8kV air
IEC 61000-4-3:2006 10 V/m
IEC 61000-4-4:2012 4 kV @ 5KHz
IEC 61000-4-5:2005 Differential mode: 4kV Common mode: 2kV
IEC 61000-4-6:2008 10V
IEC 61000-4-8:2009 30A/m contínuos
AC dips (residual%)
0% - 1/1 cycles (50/60Hz)
40% - 50/60 cycles (50/60Hz)
IEC 61000-4-11:2004
70% - 25/30 cycles (50/60Hz)
AC interrupt (residual%)
0% - 250/300 cycles (50/60Hz)
DC dips (residual%)
0% - 10ms
40% - 200ms
IEC 61000-4-29:2000
70% - 500ms
DC interrupt (residual%)
0% - 5s

6 GEGridSolutions.com
IEC 61000-4-16:1998 Differential mode: 150 Vrms. Common mode: 300V r.m.s. Freq: 16.7 Hz, 50 Hz or 60 Hz
IEC 61000-4-17:1999 Test level: 15 % of rated dc. value Test frequency: 100/120Hz, sinusoidal waveform
IEC 61000-4-18:2006 Voltage oscillation frequency: 1MHz Differential mode: 1kV peak voltage; Common mode 2,5kV peak voltage
Shut-down ramp: 60s
Power off: 5min.
Gradual Startup
Start-up ramp: 60s

Radiated emission Limits:

CISPR11:2009 (below
30 to 230 MHz - 50dB (µV/m) quasi peak at 3m
1GHz)
230 to 1000 MHz - 57dB (µV/m) quasi peak at 3m
Radiated emission Limits:
CISPR22:2008 (above
1 to 3 GHz – 56 dB (μV/m) average; 76 dB (μV/m) peak at 3 m
1GHz)
3 to 6 GHz – 60 dB (μV/m) average; 80 dB (μV/m) peak at 3 m
Conducted emission Limits:
CISPR22:2008 0.15 to 0.50 MHz - 79dB (µV) quasi peak; 66dB (µV) average
0.5 to 30 MHz - 73dB (µV) quasi peak; 60dB (µV) average
Safety tests
Safety IEC 60255-27
Impulse – 5kV
IEC 60255-5 Dielectric withstand – 2.2 kVrms
Insulation resistance > 100MΩ @ 500 Vdc
Environmental tests
IEC 60068-2-1 -40°C, 16 hours (Cold operational)
IEC 60068-2-1 -40°C, 16 hours (Cold storage)
IEC 60068-2-2 +85°C, 16 hours (Dry heat operational)
IEC 60068-2-2 +85°C, 16 hours (Dry heat storage)
+25°C ± 3 °C–97% -2% +3% RH
IEC 60068-2-30 +55°C ±2°C –93% ±3% RH
6 of 24 hours (12h + 12h) cycles
IEC 60068-2-14 -40°C to 55ºC / 9 hours / 2 cycles (Change of temperature)
IEC 60068-2-78 +40°C ±2°C –93% ±3% RH –10 days
IEC 60255-21-1 Vibration Response and Endurance Class 2
IEC 60255-21-2 Shock Response and Endurance Class 1
IEC 60255-21-2 Bump Class 1
IEC 60255-21-3 Seismic Class 2

GEGridSolutions.com 7
MU320 Ordering
Model Type MU320 * * * * * * * * * X 04 S E MU320 Integrated Merging Unit - Extented Version

Slot A - Power Supply 3 110-250 Vdc / 110-240 Vac

Slot B - Hardware Options L Two duplex LC-type connector 100BASE-FX Ethernet interfaces

Slot C - Binary I/O B3 16 x 24V/48V/125V/250V binary inputs

B4 6 x 24V/48V/125V/250V binary inputs and 8 x binary outputs

B5 6 x 24V/48V/125V/250V binary inputs and 4 x Form C + 2 x NO binary outputs

XX Not Installed

Slot D - Binary I/O B3 16 x 24V/48V/125V/250V binary inputs

B4 6 x 24V/48V/125V/250V binary inputs and 8 x binary outputs

B5 6 x 24V/48V/125V/250V binary inputs and 4 x Form C + 2 x NO binary outputs

XX Not Installed

Slot E – Binary I/OSlot 1 B3 16 x 24V/48V/125V/250V binary inputs

B4 6 x 24V/48V/125V/250V binary inputs and 8 x binary outputs

B5 6 x 24V/48V/125V/250V binary inputs and 4 x Form C + 2 x NO binary outputs

XX Not Installed

Slot F – Binary I/OSlot 2 B3 16 x 24V/48V/125V/250V binary inputs

B4 6 x 24V/48V/125V/250V binary inputs and 8 x binary outputs

B5 6 x 24V/48V/125V/250V binary inputs and 4 x Form C + 2 x NO binary outputs

XX Not Installed

Slot G – Flexible I/O options B3 16 x 24V/48V/125V/250V binary inputs

B4 6 x 24V/48V/125V/250V binary inputs and 8 x binary outputs

B5 6 x 24V/48V/125V/250V binary inputs and 4 x Form C + 2 x NO binary outputs

ME 4 x VT 115V and 4 x CT 1/5 A RMS measurement analog inputs

P1 4 x VT 115V and 4 x CT 1 A RMS protection analog inputs

P5 4 x VT 115V and 4 x CT 5 A RMS protection analog inputs

XX Not Installed

Slot H – Flexible I/O options B3 16 x 24V/48V/125V/250V binary inputs

B4 6 x 24V/48V/125V/250V binary inputs and 8 x binary outputs

B5 6 x 24V/48V/125V/250V binary inputs and 4 x Form C + 2 x NO binary outputs

ME 4 x VT 115V and 4 x CT 1/5 A RMS measurement analog inputs

P1 4 x VT 115V and 4 x CT 1 A RMS protection analog inputs

P5 4 x VT 115V and 4 x CT 5 A RMS protection analog inputs

XX Not Installed

Functions and Application A Standard Integrated Merging Unit

B PRP redundant Integrated Merging Unit

Reserved X Not Used

Firmware Version 04 Latest available firmware - 04

Coating S Standard Conformal Coating

Hardware Design Suffix E Extended version

GEGridSolutions.com
IEC is a registered trademark of Commission Electrotechnique Internationale. IEEE is a registered
trademark of the Institute of Electrical Electronics Engineers, Inc. Modbus is a registered trademark of
Schneider Automation. NERC is a registered trademark of North American Electric Reliability Council.
NIST is a registered trademark of the National Institute of Standards and Technology.
GE, the GE monogram and Reason are trademarks of General Electric Company.

GE reserves the right to make changes to specifications of products described at any time without
notice and without obligation to notify any person of such changes.
GEA-33130A
English
Copyright 2017, General Electric Company. All Rights Reserved. 1912