SIL-V – Voltage & Frequency Protection Relays

The SIL-V is a voltage and frequency protection relay and represents the best and precise protection soluctions for transformers and electrical machines, in high, medium and low voltage distribution systems. Also protects decoupling, load shedding and loss of main (islanding).

• It requires auxiliary power supply of 24-220 Vdc/48-230Vac.
• It uses a circuit breaker as a cut-off element to protect a feeder.
• 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 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-V protection relay detects this situation thanks to its voltage and frequency functions focused on the Rate of change of frequency (ROCOF) method.

• Protection functions: 27(2), 27V1, 59(2), 47, 59N(2), ΔV/ΔT, 74TCS, BF, 52, 79, 81O/U(4), 81R(2), 86, 78 and optionally 25.
  Function 25 (Synchronism): Voltage difference, frequency slip, angle differences, DLDB, DLLB, LLDB, LLLB.
• 79 protection function (Recloser) allows up to 5 attempts of reclosing which can be programmed by the user.
• Direct signalling/control both of the circuit breaker (52 function), both of the recloser (79 function).
• Metallic box with high electromagnetic compatibilitu level (EMC) and wide range of operating temperature.
• To allow the communication it has a local ModBus RTU port on the front.
• Depending on the model there are different options for communicartion rear ports:
  • RS485 rear port with IEC60870-103 or Modbus RTU protocol selectable by settings.
  • RJ45 rear port with IEC61850, DNP3.0, Modbus TCP/IP or IEC60870-104, depending on the model.
    The SIL-V has 6 inputs and 4 outputs salidas configurables by the user.
• 5 Oscillographic records, non-volatile RAM memory in order to store up to 200 events and 20 fault reports, without power supply thanks to its internal RTC (Real Time Clock).