Arc Protection Relay REA 10_ - APE Distribuidor ABB

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Arc Protection Relay REA 10_1MRS750929-MBGDesign Arc protection relay REA 101Overcurrent detection unitThe selection switch is used to select betweenthree-phase current measurement or twophaseand neutral current measurement.Three-phase current measurementThe three-phase currents are measured viatransformers. When the current on one phaseexceeds the selected reference level, an overcurrentsignal is activated.The selection switch is used to select the currentreference level for the current inputs L1,L2 and L3. The available current level settingsare 0.5, 1.0, 1.5, 2.5, 3.0, 5.0 and 6.0times the rated current (In = 1.0 A or 5.0 A).Two-phase and neutral current measurementWhen the current in L1, L3 or L2 (neutralcurrent) exceeds the selected reference level,an overcurrent signal is activated.The available current level settings for L1 andL3 are 0.5, 1.0, 1.5, 2.5, 3.0, 5.0 and 6.0 timesthe rated current (In = 1.0 A or 5.0 A).The available current level settings for L2 are0.05, 0.1, 0.15, 0.25, 0.3, 0.5 and 0.6 timesthe rated current (In = 1.0 A or 5.0 A).Light detection unitThe light captured by the sensor is amplifiedand compared to the pre-selected light referencelevel. Once the light exceeds the set referencelevel, a light signal is activated.The selection switch is used to activate thearc detection sensor.The selection switch is used to select automaticor manual light reference level.If the automatic reference level is selected,the unit forms the reference level based onthe backlight intensity measured by the sensor.When the manual reference level is selected,the unit forms the reference level based onthe value that was selected with the light referencelevel adjustment potentiometer on thefront panel.The sensor fiber condition is monitored bysending a test pulse through the fiber. If a testpulse is not received at regular intervals at theother end of the fiber loop, the “Sensor Fault”LED and the self-supervision LED “IRF” areactivated, and the IRF relay resets.If the sensor-monitoring feature is notneeded, it can be deactivated by using theselection switch.Sensitivity of sensorsFig. 1A050616Sensitivity of REA 10_ sensors at variousbacklight compensation settingsThe intensity of a high-current arc light in atwo- or three-phase short circuit can be tensof thousands of luxes. The intensity of a normaloffice lighting is 200-300 luxes.The exact determination of the detectingreach of the light sensors is difficult, becausethe detecting reach depends on several factors:• Light source energy• Fiber length• Reflectances• Backlight compensation settingsSensitivity of fiber sensorsThe incidence angle of the light is not relevantwith fiber sensors.When an arc protection system is designed,the length of the sensor fiber per one switchgearcompartment must be selected accordingto the possible short-circuit or earth-fault current,and the distance between the sensor andarc. When selecting sensor fiber length, referto the table 1.4
Arc Protection Relay REA 10_1MRS750929-MBG.Table 1: Minimum length (cm) of the exposed sensor fiber per one switchgearcompartmentFault current (rms)Distance between sensor and arc100 cm 200 cm 300 cm 400 cm0.5 kA 20 - a - a - a0.7 kA 20 70 210 2801.4 kA 20 20 20 1402.2 kA 20 20 20 20The information in the table 1 is based on thefollowing reference conditions:• Copper busbars• Arc length 10 cm• Surrounding light ~ 400 lux• No reflecting surfaces• Light reference level is set one scale markto the right from the minimumSensitivity of lens sensorsThe relative sensitivity of the lens sensorfrom different angles of lightning is presentedin figure 2. The normal operating sector is -130°... +130°. In practice, light is alsoreflected from the compartment walls, so thedetecting angle is not critical.The detection distance of a lens sensor is 3meters. Therefore, when protecting busbarsections, the maximum distance of lens sensorsfrom one another is 6 meters.Fig. 2a) Not operational.SensitivityAnglesRelative sensitivity of the REA lens sensorfrom different angles of lightingTrip outputThe trip output is provided with:• Two high-speed galvanically isolatedIGBT semi-conductor outputs, HSO1 andHSO2• Relay output, TRIP3The control signal of the outputs is activatedif the overcurrent signal and the light signal,but not the operating voltage fault signal, areactive at the same time.When the “Trip Condition” key switch on therelay’s front panel is in “Light” position, theovercurrent signal is constantly active, andtripping is activated by an arc alone. When atrip signal is delivered, the trip outputs arelatched in active state. The outputs can bereseted either by pushing the “Reset” buttonon the relay’s front panel, or by using a resetsignal applied to RESET input.Ports A and B for connecting extensionunitsThe selection switches are used to activate theports A and B.The extension units are connected to the portsA and B by using connection cables. Theextension unit receives its operating voltageand operation signals over the port.The ports are protected against short-circuitand cable breaks. If the connection cablefrom a port breaks, the concerned chain isdisconnected, and the fault LED (Port AFault” or “Port B Fault”) as well as the “IRF”LED on the central unit are lit, and the IRFrelay resets.A maximum of 5 extension units can be connectedto one port. If an extension unitincluded in the chain connected to the port isdamaged, the fault LED of the port startsflashing, the “IRF” LED is lit and the IRFrelay resets.5
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