SIL-D relay is designed to protect MV systems with isolated neutral. In switchgears with isolated neutral, the earth fault calculation cannot be done as an exact value due to it is not dependent from the short circuit power. It depends on the MV system capacitor it is connecting to. For this reason, the earth fault is related with the network voltage and with the features of the lines connected to the mentioned system.

Apart from the phase and neutral instantaneous overcurrent, and protection against phase inverse time overcurrent, the relay provides directional neutral overcurrent and directional isolated neutral overcurrent as well as circuit breaker failure supervision, neutral overvoltage and trip block for switch disconnector.

A recloser is fitted. This automated control shall permit closure (up to five attempts) with the possibility of programming each reclosing time

Further functions have been included, such as the cold load pickup, or the trip circuit supervision.

Main Applications: Distribution and transformation substations. RMUs and SF6 insulated Switchgears.

Contact us

    Name (required)

    Lastname (required)

    Email (required)

    Company (required)




    Select your Country*

    Your message (required)

    This site is protected by reCAPTCHA and the Google
    Privacy Policy and
    Terms of Service apply.

    SIL-D relay is an overcurrent and directional earth fault protection relay for Primary and Secondary Distribution.

    • Auxiliary power supply (24-220 Vdc / 48-230 Vac).
    • Protection functions: (2) 50 + 50/51 + (2) 50N/G + (2) 50N/51N/67N(1) + 52 + 50BF + 79 + 74TCS + CLP + 86 + 49T + 59N. Optionally, directional isolated neutral overcurrent(2) : 67NI_1 and 67NI_2.
      It includes switch disconnector protection function by means of trip blocking.
    • Function 67NI. Directional neutral isolated overcurrent with two neutral directional units: 67NI_1 and 67NI_2.
      This function is based on two supervisions: The analogue to the one that uses the 67N to check that the residual current is inside the defined area by the settings of directionality, operation angle and halfcone, and the second supervision of the modules of the residual voltage and current.
    • To perform the directional detection, the residual voltage is used as polarization magnitude and the residual current as an operating magnitude. The intervention sector in forward direction is defined in the following way: the operating angle is rotated anticlockwise from the negative residual voltage,-V0 which gives us the maximum torque direction. A cone is drawn, with the half-cone angle adjusted, over this maximum torque direction. In the same way, the intervention sector in reverse direction is defined in the following way: the operating angle is rotated anticlockwise from the positive residual voltage, V0 which gives us the maximum torque direction. A cone is drawn, with the half-cone angle adjusted, over this maximum torque direction.
      When 67NI is not activated the functions works like 50/51G.
    • 5 attempts of reclosing with 79 protection function (Recloser). Direct signalling/control of function 52 (Circuit breaker) and function 79 (Recloser).
    • Metallic box with high electromagnetic compatibility level (EMC) and wide range of operating temperature.
    • 1 rear port on the back with the following options respect to communication protocols:
      • One rear port RS485 with IEC60870-103 or Modbus RTU selectable by settings.
      • One rear port RJ45 with IEC 61850, DNP 3.0 TCP/IP or IEC 60870-5-104 (depending on the model).
    • 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).

    50 Instantaneous phase overcurrent
    50/51 Inverse time phase overcurrent
    50N/G Instantaneous neutral overcurrent
    67N Inverse time directional neutral overcurrent
    67NI Directional neutral isolated overcurrent
    59N Definite-time neutral overvoltage
    52 Circuit Breaker monitoring
    50BF Circuit Breaker opening failure
    74TCS Trip circuit supervision
    79 Autorecloser
    CLP Cold Load Pickup
    TB Trip block for switch disconnector
    49T External Trip
    86 Trip Latch
    68 Zone selection interlocking

    Communication Software for SIA & SIL protection relays

    The SICom PC software has been designed and programmed to gain access to all of Fanox relays information, to modify the settings and configuration, check states and measurements and to analyse and save events and fault reports using a graphic-friendly user interface.

    SICom software works with the Windows® Windows 7, Windows 8, Windows 8.1 and Windows 10 operating system.

    • General data reading: Complete model, Version, Serial number, etc.
    • States reading
    • Measurements reading
    • Reading and changing settings
    • Reading and changing configuration
    • Reading and deleting events
    • Reading and deleting fault reports
    • Reading and deleting demand current (load data profiling)
    • Reading and saving oscillographic records in Comtrade format
    • Changing the user passwords
    • Saving and Loading settings files
    • Saving and Loading configuration files
    • Saving events and fault reports
    • Saving demand current (load data profiling)
    • Date-time synchronization
    • Configuring the communication parameters
    • Reading and changing counters
    • Commands for opening and closing the circuit breaker and block/unblock the recloser
    • Configuration of the inputs
    • Configuration of the outputs
    • Configuration of the causes that start a Fault Report

    The update of the software does not require any user´s action, this is, if the computer is connected to Internet, SICom updates itself when it is started.
    It will allow you to prepare all the settings and relay configurations without having the relay connected to the PC (offline mode), reducing engineering and commissioning time.
    SICom program uses Modbus protocol, so only the ports with this protocol can be used to establish the communication.

    SIL RANGESIL-ASIL-VSIL G
    TypeFEEDER PROTECTION RELAY / OVERCURRENT AND EARTH FAULT PROTECTIONVOLTAGE PROTECTION RELAYFEEDER AND GENERATOR PROTECTION WITH CURRENT, VOLTAGE AND FREQUENCY FUNCTIONS
    Auxiliary Supply24-230 Vdc/Vac24-220 Vdc/48-230 Vac24-220 Vdc/48-230 Vac
    Self-powered through the VTs
    Consumption3,3 – 4,5 W3,3 – 5,5 W24-48 Vdc and 48-230 Vac/dc < 10VA. 24-230Vac/dc <20VA
    Current measurementStandard CT <0,5VAn/aStandard CT 0,5VA
    LPCTn/an/an/a
    Voltage measurementn/aVT or directly from the lineVT or Directly to the low voltage line
    VT connection typen/aSettableAdjustable
    502n/a2
    50G2n/a1
    50N2n/a1
    50/512n/a4 levels of 67*
    50/51G2n/a2 levels of 67G*
    50/51N2n/a2 levels of 67N*
    67GI1n/an/a
    67NI1n/an/a
    50/51/67G 1n/a*
    50/51/67n/an/a*
    SOFT1n/a1
    64REF1n/an/a
    521n/a1
    BF111
    491n/a1
    49T111
    79111
    461n/a1
    CLP1n/a1
    74TCS111
    Trip Block1n/a
    68 (Trip Bus)111
    86
    46BCn/a1
    60CTS 1n/a
    60VTS1
    Programmable LogicV3V3
    371n/a1
    59n/a22
    59N122
    47n/a11
    27n/a22
    27V1n/a11
    32/40n/an/a4
    81U/On/a44
    25n/a11
    59Ln/a1
    27Ln/a1
    81Rn/a24
    78n/a11
    IRIG-Bn/an/aOptional
    Counters
    Commands
    Sett. Group434
    Inputs668 / 16 / 24 / 8 + 4 AFD
    Outputs747 / 11 / 18 / 7 + 4 HS-O
    LEDs8 configurable8 configurable11 configurable
    HMI20X2 LCD + 7 keys20X2 LCD + 7 keys20X4 LCD + 13 keys
    52 & 79 HMI2 led’s + 4 keys2 led’s + 3 keys2 led’s + 4 keys
    Event20482003072
    Fault Report2020Configurable up to 100
    OscillographyConfigurable, from 5 to 100 records5 records x 88 cyclesConfigurable up to 100
    Current demandn/a
    Local Port (frontal)USB RS232USB
    Remote Port (rear)RS485 or EthernetRS485 or EthernetRS485 or Ethernet or Fiber Optic
    Communications ProtocolsRS 485 (ModBus RTU or IEC60870-5-103 or DNP3.0) RJ45 (Modbus TCP or DNP3 TCP or IEC 60870-5-104) or RJ45 (IEC61850) + SNTP protocolRS485(ModBus RTUor IEC60870-5-103) RJ45 (Dnp3 TCP) RJ45(IEC 61850) RJ45 (IEC60870-5-104)RS485(Modbus RTU or DNP3.0 Serial or IEC 60870-5-103) RJ45(Modbus TCP/IP DNP3.0 TCP/IP) RJ45( IEC 61850) FO-LC(IEC61850)
    Size of177 x 107 mm177 x 107 mm198 x 187 mm

    Related Products

    SIL-V
    Synchronism Protection Relays

    Fanox SIL-V represents the most precise voltage and frequency protection solution for transformers and electrical machines in high, medium and low voltage distribution systems.

    Also protects against decoupling, load shedding and loss of main (islanding).

    SIL-A
    Line Protection Relays

    Fanox SIL-A Relays designed for overcurrent and earth fault protection take a step forward in terms of line protection providing advanced communications and more protection functions such as auto-recloser.

    The ability of being able to choose between standard /1 or /5 CTs easily by software combined with more sensitive measurements provides you the flexibility and reliability you need for a complete line protection.

    SIL-B
    Feeder Protection Relays

    Protection against overcurrent and overvoltage.

    The ability of measuring current, voltage and frecuency levels combined with Syncro-Check and directional protection functions makes him one of the safest and most reliable choices for feeder protection.

    SIL-G
    Generator/Feeder Protection Relays

    Fanox SIL-G is a relay for primary distribution which can protect a feeder by means of current, voltage and frequency functions.

    His main features include Arc Flash Protection with 4 inputs and 4 high-speed outputs, and being able to choose between universal supply and Self-Powered through VTs.

    It also brings some innovative features such as WIFI connection providing you complete safety during maintenance.