Home     Products     HAFEZ   HAFEZ 131  


  • Fully designed in Iran and have Iran standard institute Certificates
  • Designed for protection of distribution transformer, MV feeder protection, Recloser controller, PCC point, and motor protection
  • 5 analog input ( 4 current input and one closable current or voltage )
  • 20 protection function and 4 supervisions function
  • Modbus communication protocol
  • 8 temperature sensors and 2 4 to 20 mA input
  • Stores 35 3 seconds event and 1000 events recorder

Relay Hafez 131 is designed and built based on IEC 60255 standard. This relay was fully designed based on Iranian experts’ knowledge, all algorithm fulfills Iran's electrical distribution network requirements and satisfied different MV network requirements.
  • Two stages in delayed protection ANSI 51 with standard curves
  • Two stages in instantaneous or constant time Protectionism ANSI 50
  • One stage delayed Earth fault Protection with standard cures ANSI 51N
  • One stage delayed fault Protection with standard cures ANSI 51
  • two stages Instantaneous Earth fault Protection ANSI 50
  • Sensitive earth fault
  • Distribution and sub-transmission transformer overload protection ANSI 49
  • Two stages negative sequence protection ANSI46
  • Two stages Broken conductor Protection unit
  • Demand control
  • Circuit breaker failure unit ANSI 50
  • Wear condition and number of Circuit breaker operation
  • Auto reclose ANSI 79
  • Cold load pickup ANSI51c
  • Inrush blocking unit
  • Instantaneous overcurrent (<<<I) or Instantaneous Earth fault error (<<<I0) with under one cycle operation
  • PCC point protection for Distributed generation
    • Two stages overvoltage protection 59
    • Two stages earth fault over-voltage protection 59N
    • Two stages under-voltage protection 27
    • Two-stage frequency increase 810
    • Two stages drop frequency 81U
    • Four stages ROCOF protection for island detection 81R
    • Four stages Directional earth fault (67N)
    • Two stages return Power (32R)
  • Low and medium Motor protection
    • Motor overload protection 49M
    • Motor stall protection 48
    • Motor start inhibit protection 66
    • Under current protection 37
    • Motor temperature control with RTD module
  • Improved Instantaneous unit Stability Negative sequence and earth fault in CT saturation
  • Enhanced inrush current detection while CT saturation
  • Smart and fast setting for protected devices
  • Enhance transformer thermometer operation for trip and alarm command
  • Smart Recloser with adaptive operation based on fault current magnitude and fault type
  • Circuit breaker chamber age estimator and operation mechanism
  • Choose calculation method of current amplitude with first harmonic and True-RMS
  • Relay characterization and reset time
  • Mode bus RTU communication protocol
  • Connect with a computer program with Ethernet port (TCP/IP)
  • User-friendly GUI for communicating with relay (setting, configuration, Fault waveform visualization, etc.)
  • Recording events and faults
  • Record current waveforms of fault
  • Solar and Christian calendar
  • 8 programmable digital input
  • 8 RTD input and two 4 to 20 mA input
  • 4 programmable digital output
  • 8 signal LEDs (3 fixed usage – 5 programmable)
  • Changeable password
  • Having a metal box with electrostatic dye

Address: University of Tehran Science & Technology Park, North Kargar st., Tehran, Iran
Phone Number: +98 (21) 88013196
Postal Code: 1439817435
Follow Us
Telegram AparatInstagramLinkedInYoutube

All rights reserved for ESFA Company .