eaton arc flash relay

Eaton Arc Flash Relay

The Eaton Arc Flash Relay (EAFR) system protects low and medium-voltage electrical assemblies from devastating arc flash events. By detecting and quickly clearing arc faults, the EAFR system significantly reduces the energy released, safeguarding both personnel and equipment. The system employs advanced technology to measure both light and current, ensuring accurate detection and minimizing false alarms. Its modular design makes it suitable for both new installations and retrofits.

  • Easy adaptation to any switchgear and trip scheme
  • circuit breaker failure protection
  • 12 Max point sensors, 4 trip relays
  • 2 ms operating time
  • Self Monitoring

 

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Features of Eaton Arc Flash Relay

1. Eaton arc flash relay EAFR offers advanced protection features, including Combined Current and Arc Sensing for enhanced accuracy and reliability, Instantaneous Overcurrent Protection protects against short circuits, and Breaker Failure Protection provides additional safety measures.

2. It utilizes current transformer inputs to monitor phase and ground currents. These measurements are used in conjunction with light sensing to ensure accurate and reliable arc flash detection. The current information can also be shared with other system components for coordinated protection.

3. It can use either point sensors or fiber loop sensors to detect arc flash events. Up to 12 point sensors or 3 loop sensors can be connected to each module. Point sensors, connected with copper wire, offer easier installation for OEMs. Fiber loop sensors provide flexibility and can be daisy-chained up to 100 meters.

4. The system includes comprehensive self-monitoring capabilities, verifying the integrity of internal functions and external connections to light sensors, loops, and current transformers.

5. The system offers rapid response times with four trip relays (7 ms) and two high-speed outputs (2 ms), along with a system failure relay.

 

Specification of Eaton Arc Flash Relay

Protection Stages
Trip Time Using HSO 2 ms*
Trip Time Using Mechanical Trip Relays 7 ms*
Reset Time (Light Stage) 1 ms
Reset Time (Over-current Stages) 50 ms
Protection Operational After Power-Up 50 ms
* = Total trip time using arc light or phase/earth over-current from
EAFR-110 and arc light.
Current Measuring Circuits
Nominal Current 1 or 5 A
Rated Frequency 2 to 1,000 Hz
Number of Inputs 3 (Phase) + 1 (Earth)
Thermal Withstand Continuous 30A
Thermal Withstand 1 s 500A
Thermal Withstand 10 s 100A
Phase Over-current Setting Range 0.5 to 6 *In
Earth Over-current Setting Range 0.05 to 2 *In
Measurement Accuracy 10%
Rated AC Burden (VA) Input Resistance 10 mΩ
Power Consumption of Current Inputs
Circuit		 <10 mΩ
Trip relays T1, T2, T3, and T4
Number 3 NO + 1 NC or 4 NO
Rated Voltage 250 Vac/dc
Continuous Carry 5A
Make and Carry for 0.5 s 30A
Make and Carry for 3 s 16A
Breaking Capacity DC, When Time Constant
L/R = 40 ms		 40 W; 0.36 A at 110 Vdc
Contact Materia AgNi 90/10

 

 

 

 

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