Arc protection relays are mainly used to detect arc faults in electrical systems and protect equipment and personnel in electrical systems from arc faults. Arc protection relays can detect arcs by monitoring parameters such as current, voltage, and electric power, and quickly disconnect the power supply before an electrical fire occurs, thereby reducing the risk of fire.
Arc protection relays are usually used in medium and high-voltage power distribution systems, control cabinets, transformers, generators, motors and other electrical equipment. They adopt the dual-criteria principle of arc light detection and overcurrent detection and have the characteristics of fast protection action and high reliability.
Overview arc flash relay
Complete digital design, simple principle; Strong electrical performance;
Comprehensive record of fault information; Double criterion of over-current and arc, high reliability;
Optical fiber transmits, strong electromagnetic interference resistance;
Programmable logic of trip exit; Fast exit tripping, short total fault clearing time.
High-Speed Tripping for arc flash protection
The AFR-M arc flash protection relay provide a total trip time of less than 10ms for busbar faults and circuit breaker failure protection. Thus, it can send a trip signal to the circuit breaker as fast as possible.
Busbar Arc Flash Protection
Busbar arc flash is most likely to occur in busbar room, circuit breaker room, cable room and busbar cabinet, where insulators, conductor connections, switchgear, cable joints and other locations are potential arc flash sources. The AFR-M Arc flash protection relay is designed to monitor the busbar sections within a power system for potential arc fault occurrences. This advanced arc flash relay can monitor up to 48 busbar sections in single-phase, three-phase, or distributed configuration.
RS48 and Ethernet Communication
The AFR-M arc flash relay are with 2 RS485 ports and 2 Ethernet ports that support IEC60870-5-103 communication. It communicates via Modbus TCP, DNP3 LAN/WAN, Telnet, FTP, or IEC 61850 too. Moreover, You also can customize extra monitoring functions by RS485 connection, including Bus temperature monitoring (wireless), Partial Discharge monitoring sensor (TEV), and smoke sensor
Current & Light Sensing for Arc Flash Detection
The current sensing of AFR-M is through four 3-phase current signal input, monitoring 3 group of current for the phase and ground instantaneous overcurrent elements. Lighting sensing is through arc flash sensors including point sensor or fiber loop sensors. Or lighting sensing by pressure sensor. with 3 arc flash expansion modules option, the AFR-M arc flash protection system supports up to 48 arc flash sensor connection. Each arc flash expansion module support 12 arc flash sensors connection. The combination of light and current detection provides the ideal solution for arc-flash mitigation.
-. Power supply
AC/DC85 ~ 265V
-. Consumption
≤ 8W
-. Current input
| Current rated : |
5A/1A |
| Measurement range: |
protection current: 0~20In |
| Consumption: |
≤ 5VA |
-. Electrical parameters tolerance
| Protection current: |
≤ 2% |
| Protection frequency: |
0.1Hz |
-. Arc signal input
| Channels number: |
12-48 channels (optional) |
| Sensor type: |
Optical fiber |
| Detect light type: |
Visible light/UV light (optional) |
-. Relay output
| Channels number: |
9 channels |
| Operating Voltage: |
AC250V/8A |
| Input method: |
Passive contact |
| Isolation method: |
Photoelectric isolation, isolation voltage 2500V |
| Relay action cycle: |
<4ms |
-. Digital input
| Channels number: |
16 channels |
| Operating Voltage: |
220Vdc |
| Input method: |
Wet contact |
| Isolation method: |
Photoelectric isolation, isolation voltage 2500V |
| |
|
Note: Optional passive node (confirm before order)
-. Action time tolerance
Pure arc protection: ≤10ms
Double criterion protection: ≤20ms
-. RS485 communication
| Interface: |
RS485 (one standard, two optional) |
| Isolation type: |
photoelectric isolation, lightning protection |
| Baud rate: |
9600bps |
| Protocol: |
Modbus |
-. Ethernet communication
| Interface: |
2-Way Ethernet optional |
| Network parameters: |
10M/100M adaptive |
| Default IP: |
192.168.12.2/192.168.13.2 |
| Standard: |
IEC60870-5-103 |
-. Environment
| Working environment: |
-10 ~ 55°C/ < 93% RH (Non-condensing) |
| Storage environment: |
-30 ~ 70°C/ < 70% RH (Non-condensing) |
| Relative humidity: |
5%~ 95% |
| Atmospheric pressure: |
60kPa ~ 106kPa |
-. Electromagnetic compatibility
| Item |
Standard |
| Electrostatic discharge test: |
IEC 60255-22-2:2008. level-4 |
| Fast transient dry resistance test: |
IEC 60255-22-4:2008. level-A |
| 1mhz burst interference test: |
IEC 60255-22-1-2007. level-3 |
| Electrical disturbance test: |
IEC 60255-22-2:2008.level-3 |
| Surge immunity test: |
IEC 60255-22-5:2008 |
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