Secondary Protection System MT SME2-IS (RGDM-I)
Fault detection device for indoor use with functions of maximum current, earth directional, maximum active power directional , reclosing, presence/absence of voltage, and synchronized control. Compliant with ENEL GSTP011 standards and cybersecurity.
H2: Features of the Secondary Protection System MT SME2-IS (RGDM-I)
The SME2-IS fault detectors are designed in compliance with ENEL GETP011 specification (Protection and control device for MV substation – RGDM control unit). They are installed in remotely controlled secondary substations to detect phase-to-phase and ground faults in both isolated and compensated neutral networks without needing configuration changes when switching network setups and independently of the power feed direction. Specifically, they enable:
- Detection of multi-phase and single-phase ground faults
- Detection of line undervoltage
- Measurement of voltage and active/reactive power on the MV line
- Control of DY800 opening and closing during faults or remotely from UP
- Interface with generators present on the MV network to coordinate voltage regulation along the line and remote disconnection signals
- Coil current measurement
The input circuits are suitable for measurement acquisition via integrated phase current/voltage sensors. The device can, through software selection, acquire current measurement signals from active sensors (signal proportional to the current value transduced by the sensor) or passive sensors (DJ 5400 and GSTC005 - signal proportional to the current derivative value over time). The device allows current and voltage measurements through Low Power sensors compliant with IEC 61869-10 and IEC 61869-11.
The homopolar values are calculated vectorially from the measured phase currents and voltages. Voltage measurement inputs are available with capacitive voltage dividers.
Additionally, two Ethernet communication ports are available, one with IEC61850 protocol.
To ensure full compatibility with RTUs already present in secondary installations, the SME2-IS device is equipped with a dual interface, capable of communicating with both the UP (DX1215) and future communication devices. Calibration, programming, and reading of measurements and recordings can be done through a Personal Computer or via Ethernet communication port with software (ThyVisor) available for free. All the above operations are also possible using the front keyboard (MMI).
