The SIR-A is an Overhead Control / RTU & and Feeder Protection relay with current, voltage, and frequency functions for primary and secondary distribution with an auxiliary power supply of 24-230 Vdc/ac, 48-230 Vdc/ac, or 24-48 Vdc (depending on model).

• 4 current channels and 6 voltage channels for capacitive and resistive low-power voltage sensors (LEA).
• Metallic box with high electromagnetic compatibility level (EMC) and wide range of operating temperature.
• Protection of decoupling, load shedding, and loss of main (islanding). Loss of Main (islanding) occurs when part of the public utility network loses connection with the rest of the system. If this situation is not detected, 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. SIR-A relay detects this situation thanks to its voltage and frequency functions focused on the Rate of change of frequency (ROCOF) method.
• Signalling/control the circuit breaker (52 function) and the recloser (79 function).
• The front part of the SIRA is provided with a navigation keypad made of 7 keys (including the RESET key), 6 programmable hot keys that by default are configured: two (2) keys to open and close the CB, two (2) keys to block and unblock the recloser and two (2) keys to put the relay in local or remote mode with their associated three (3) configurable control LEDs. Besides, depending on the model:
  • Adaptation B: Eight (8) programmable alarm LEDs
  • Adaptation C: Thirteen (13) programmable alarm LEDs + 8 configurable keys with their associated configurable LED.
• Arc Flash detection (AFD) with 4 AFD inputs and 4 high-speed outputs available depending on the model. This functionality, along with the possibility of having WIFI communication, allows the users to set and configure the relay through Fanox free software and to operate the relay without being present in the installation, prioritizing security.
• In case a CB is manually closed, a switch on to an existing fault may occur. This fault condition is critical if the overcurrent protection function does not clear the fault until the adjusted time delay is finished. It is necessary, in those cases, to clear the fault quickly by means of SOTF function.
• To allow the communication, relays are provided with a local micro-USB front port and with remote communication with different options (ports and protocols) on the rear side:
  • Rear Serial Port: IEC60870-5-103, Modbus RTU or DNP3.0 Serial (selectable by general settings).
    • Adaptation B: Rear RS485 port
    • Adaptation C: Rear RS485 or RS232 port (selectable by the user, both ports are not available simultaneously)
  • Rear RJ45 Port: Modbus TCP/IP, DNP3.0 TCP/IP, IEC60870-5-104 (selectable by general settings) + SNTP Protocol + Web Server.
  • Rear RJ45: IEC61850.
• Wireless communication (WiFi) and synchronization through IRIG-B are optional, depending on the model.
• Alarms panel is available.
• The SIR-A is provided with (depending on the model):
  • 8 configurable inputs and 7 configurable outputs.
  • 24 configurable inputs and 7 configurable outputs.
  • 8 configurable inputs and 18 configurable outputs.
  • 16 configurable inputs and 11 configurable outputs.
  • 8 configurable inputs, 7 configurable outputs, 4 AFD inputs, and 4 High-Speed outputs.
• SIR-A is fitted with the demand of power (Load Data Profiling) with the following characteristics:
  • Number of records: 2160.
  • Recording mode circular.
  • Sampling rate (interval): configurable through communications (1-60 min).
• Alarms panel is available.
• SIR-A is provided with non-volatile RAM memory in order to store up to 3072 events and disturbance fault recording (DFR), maintaining date & time thanks to its internal RTC (real Time Clock).
  • 5 records in data and COMTRADE format (300 cycles each record): 1 to 8 pre-fault cycles + 292 to 299 post-fault cycles.
  • 25 records in data and COMTRADE format (60 cycles each record): 1 to 8 pre-fault cycles + 52 to 59 post-fault cycles.
  • 50 records in data and COMTRADE format (30 cycles each record): 1 to 8 pre-fault cycles + 22 to 29 post-fault cycles.
  • 100 records in data and COMTRADE format (15 cycles each record): 1 to 8 pre-fault cycles + 7 to 14 post-fault cycles.)
• Each oscillographic record contains 10 analogue channels and up to 96 configurable digital channels. The oscillography is downloaded by a communications port. The SICom communications program allows the oscillography record to be downloaded and saved in COMTRADE format (IEEE C37.111-1991)