Fault detection and MV switchgear automation: Overcurrent fault detection is a key point for the MV grid control. The ability to detect these faults allows the operator of the Control Center to isolate the affected area very quickly. The direct measurement of the CT (Current Transformer) allows the user to know, in real time, the RMS current that flows through each line, as well as the current flowing in the neutral line. This value is compared with the threshold current and the time curves (IDTF) predefined by the user in order to determine if there is a fault state. The use of VPIS (Voltage Presence Indicating Systems) sensors when the overcurrent is detected, allows the user to know when the primary switchgear is opened. iRTU F family is the ideal solution for Control and Automation of existing MV Substations, allowing the detection of any kind of overcurrent that appears in their lines and reporting to the control center the kind of event that has been detected. With the overcurrent information and the voltage presence detection, the iRTU decides if there is a fault in the MV grid and whether the switchgear must be opened or not, when there is no voltage due to the opening of the HV substation feeder. For more information, visit us on: www.igrid-td.com

1. iRTU F
iRTU F Series :
The RTU with fault detection
Overcurrent fault detection is a key point for the MV grid control.
The ability to detect these faults allows the operator of the Control
Center to isolate the affected area very quickly.
The direct measurement of the CT (Current Transformer) allows to
know, in real time, the RMS current that flows through each line, as
well as the current flowing in the neutral line. This value is compared
with the threshold current and the time curves (IDTF) predefined by
the user in order to determine if there is a fault state.
The use of VPIS (Voltage Presence Indicating Systems) sensors
when the overcurrent is detected, allows the user to know when
the primary switchgear is opened.
Product Highlights
Four direct readings of CT measurements
Three analog inputs, direct V 3kV insulation in the power supply, I/O and serial ports.
Four digital inputs
Control center connection through RS232 or ETH ports
with IEC60870-5-101/-104, DNP3.0 or ModbusRTU/TCP maintenance (Telnet and FTP)
Up to 3 ports (RS422/RS485) to connect any intelligent
device (IED) using IEC60870-5-101/102/104, Modbus, compatibility and environmental standards required by
Procome or DLMS. the electricity sector
I/O capabilities can be expanded with iRTUe modules
connected through EXP422 port

2. Fault detection and MV switchgear automation
iRTU F family is the ideal solution for Control and Automation of existing MV Substations, allowing to detect
any kind of overcurrent that appears in their lines, and reporting to the control center the kind of event that has
been detected. With the overcurrent information and the voltage presence detection, the iRTU decides if there
is a fault in the MV grid and whether the switchgear must be opened or not, when there is no voltage due to the
opening of the HV substation feeder.
The procedure for overcurrent fault detection is summarized below :
- Continuous reading of the current in RMS format.
- Comparison with the threshold current and the time curves (IDTF), defined by the user in the iRTU data base.
- Generation of the OC (overcurrent) alarm.
- Reading of the voltage status through the VPIS sensors in order to know whether the substation feeder is
opened or closed.
- Based on the above parameters (RMS current value, voltage presence, time curves defined by the user, etc.),
the iRTU decides if there is a fault condition and whether the switchgear must be opened.
All parameters can be separately set for phase and homopolar cases in the iRTU database.
Technical Specifications
› Communications
(4) Serial port (3kV isolation) with TX/RX LED indicators: 60870-5-101/102/104
(1) Full RS232 / RS422 / RS485 software configurable 61850
(2) RS422/RS485 software configurable
(1) EXP422 for connection with iRTUe devices
1) Ethernet 10/100 45)
(1)
printers, etc.) › I/O
(1) (4) Digital inputs.
(local maintenance) Rated input voltage: 48Vdc (+20% –15%)
32 Gb data storage (4) Analog inputs from CT (xxxx/1) with 1%
precision in the measuring range and less than 10% in
the overcurrent range.
3) Ethernet 10/100 (3) Analog inputs, direct V
45) and (2) redundant Ethernet 100 (2) Relay outputs for switchgear automation
(ST, SC or SFP connectors; multimode fiber) 500 Hz sampling frequency
12 bits plus sign and overflow bits
60870-5-101
60870-5-104 (ETH10/100 or Serial PPP) iRTUe units.
3.0 serial Expansion options:
48 DI / 24 DI + 8 relays / 24 DI + 8 AI-20mA

3. Besides the overcurrent fault detection, the iRTU F devices offer all the functionalities of the iRTU remote
telecontrol units and the iGW data concentrator units, providing therefore one of the most versatile devices for
control of MV grids of the market.
› Power Supply › Regulations
48 Vdc, 24Vdc or 12Vdc (-20%,+15%) 55022: Information technology equipment. Radio
3kV isolation disturbance characteristics. Limits and methods of
measurement.
3W 61850: Communication networks and systems in
substations.
› Applications and Maintenance 60255-5: Electrical Relays. Insulation Coordination
for Measuring Relays and Protection Equipment.
Requirements and Tests.
6100-4 , IEC6100-6-4/5: Electromagnetic
Compatibility (EMC)
› Physical Characteristics 60870-2-2: Telecontrol equipment and systems.
Operating conditions. Environmental conditions.
iRTU and iRTUe devices 60950-1: Information technology equipment. Safety.
11 connectors General requirements.
173x135x78 mm
900gr
› Environmental Conditions
-20º to +70ºC
93% non-condensing at 55ºC

4. Smart Solutions
for Smart Grids
iControl
Substation SCADA
iRTU
Remote control of HV and MV
substations & power plants
www.igrid-td.com
C/ Marie Curie, 8-14 Contact:
Parc Tecnològic Barcelona Nord sales@igrid-td.com
08042 – Barcelona sat-bcn@igrid-td.com
Catalunya – Spain