Eaton EAFR-01 User Manual

Also see for EAFR-01: User manual

Contents

11. Arc SensorsArc Sensor User Manual MN026008EN February 2016 www.eaton.com1. Arc SensorsThis manual describes only the EAFR-0x series sensors forEaton arc flash relays arc protection system. It is impor-tant to read through instruction manuals of Eaton arc flashrelays.The Eaton arc flash relays (EAFR) series provides the choiceof different types of arc sensors to be utilized in differentunits and different switchgear types according to specificapplication requirements. Available sensor types are arclight point sensors and arc light fiber optic loop sensors.Arc light point sensors are typically installed in metal cladcompartments providing quick, accurate location of the fault-ed area. Arc light fiber loop sensors are typically installed tocover a wider protected area with one fiber when no needfor more exact fault locations exists.1.1 Arc Light Point Sensor Group: EAFR-01-A,EAFR-01-B, and EAFR-01-CThe EAFR-01 arc light point sensors have a light sensitivephotodiode element activated by receiving arc light. TheEAFR-01 arc sensors should be mounted in the switchgearcubicles in such a way that the light sensitive part canreceive light from the protected area. Typically, one sen-sor per closed metal clad compartment is used. In openspaces, such as the bus bar section, arc sensors should bemounted at a maximum of two meters (6.56 ft) apart.The fixed light sensitivity of the EAFR-01-A sensor is 8,000Lux, the EAFR-01-B sensor is 25,000 Lux and the EAFR-01-Csensor is 50,000 Lux. The sensor does not require usersettings. The point sensor’s light detection radius is 180degrees.Figure 1. Arc Point Sensor EAFR-01.1.1.1 EAFR-01 Installation and WiringThe EAFR-01 point sensors can be installed either on orthrough the compartment wall. An example of on the wallmounting is seen in Figure 2. The EAFR-01 sensor is fixedagainst the wall using two screws.Figure 2. EAFR-01 Point Sensor Mounted to theCompartment Wall.The same screw pattern is utilized in a through the wallmounting arrangement. In this arrangement, the unit isturned around and the point of the photodiode sensor pro-trudes through a small hole cut in the wall. The point of thesensor now faces the compartment to be protected. Thisallows for the body of the sensor and cabling to be locatedoutside the compartment (see Figure 3). For both types ofinstallation, two screws are attached from the back side ofthe sensor. No external mounting plates are needed in anycase.