The SIL-G is a perfect protection relay for primary distribution which can protect a feeder by means of current and voltage functions.

• It also have the advantage that provided with the main functions to protect a generator protecting decoupling, load shedding and loss of main (islanding). It is normally used with a circuit breaker as cutting element.
• SIL-G can work with auxiliary power supply 24-220 Vdc/48-230 Vac or in self-powered mode through the VTs (depending on model).
• Capability of measuring up to 1.000 volts when it is connected directly to the low voltage line.
• Protects decoupling, load shedding and loss of main (islanding). Loss of Mains (islanding) occurs when part of the public utility network loses connection with the rest of the system. If this situation is not detected, then the generator could remain connected, causing a safety hazard within the network. Automatic reconnection of the generator to the network may occur causing damage to the generator and the network. SIL-G protection relay detects this situation thanks to its voltage and frequency functions focused on the Rate of change of frequency (ROCOF) method.
• Protection functions: 50 (2), 67/51/50 (4), 50N (1), 50G (1), 67N (2), 67G (2), 46, 46BC, 49, 37, 59 (2), 59N/G (2), 59L, 47, 27(2), 27V1, 27L, 32 (4), 81O/U (4), 81R (4), 78, CLP, SHB, 50BF, 79, 52, 86, 49T, 74CT,60, 74TCS. Optionally 25, 27L and 59L.
• Arc Flash detection (AFD) with 4 AFD inputs and 4 high-speed outputs available depending on model.
• 79 protection function (Recloser) allows up to 4 attempts of reclosing which can be programmed by the user.
• SIL-G has metallic box with high electromagnetic compatibility level (EMC) and wide range of operating temperature.
• Direct signaling/control of the circuit breaker (52 function), of the recloser (79 function) and the communications local/remote control.
• To allow the communication locally, relays have a front USB port. Depending on model, WiFi local communication is available.
• For remote communications several rear ports are available with the following protocols (depending on model):
  • Serial rear port RS485: Modbus RTU, DNP3.0 Serial or IEC 60870-5-103
  • Ethernet rear port RJ45: Modbus TCP/IP, DNP3.0 TCP/IP or IEC 61850
  • Fiber Optic: redundant communication (HSR – IEC 61850)
• Alarms panel is available.
• SIL-G is capable of displaying different measurements like:
  • Phase currents, neutral (measured and calculated), maximum current, positive sequence current and negative sequence current.
  • Second harmonic current per phase
  • Phase to neutral, phase to phase voltages, neutral voltage (calculated and measured), maximum voltage, phase B line voltage (optional for the model with ANSI 25), positive sequence voltage and negative sequence voltage.
  • Current angle for each phase and neutral (referred to VA). Voltage angle per each phase and neutral (referred to V-A). Phase B Line voltage angle (optional for the model with ANSI 25).
  • Active, reactive and apparent powers (3- phase and per phase)
  • Thermal image
  • Line frequency and busbar frequency
  • Rate of change of frequency
• The SIL-G is provided with (depending on model):
  • 8 configurable inputs and 7 configurable outputs.
  • 16 configurable inputs and 11 configurable outputs.
• Up to 100 oscillographic records and fault reports (1500 cycles in total considering the number of cycles configurable to 15, 30 or 60 cycles), load data profiling with up to 2160 records and 2048 events can be recorded in non-volatile RAM memory maintaining the date and time thanks to its internal RTC (Real Time Clock).
• Synchronization through IRIG-B and SNTP optional depending on model.