# line differential relay setting calculation

The bias slope limit is chosen to ensure the biased differential function is stable for high through fault currents coincident with CT saturation. − Corrected ETAP setting indicated in Differential Element Settings and Specifications. 2 : Model setting calculations -Line 1-149 3 : Model setting calculations-Transformer 1-132 4 : Model setting calculations- Shunt Reactor 1-120 5 : Model setting calculations- Busbar 1-15 6 : Relay setting guide lines for transmission lines 1-19 7 : Recommendations for protection system management 1-5 We will start the transformer differential protection calculation with the identification of … has completely saturated. 2.1 Differential Relay Settings Calculations MiCOM P63X Relay Type: MICOM P63X Required Data Ratings of the Power and Current Transformers MVA Voltage Ratio Rated Voltage in kV (HV Side) Rated Voltage in kV (LV Side) Vector Group CT Ratio (HV Side) CT HV Side Vector Group CT Ratio (LV Side) CT LV Side … This setting is primarily needed to prevent operation of relay in case of through fault results saturation of CTs causes a transient differential current to be detected by the relay. Differential Relays 2. A series resistor Rs can be inserted in series with the relay … what to know about protective relays electrical. guidelines for relay settings at traction. Application Example on Transformer Differential Protection Calculation 25/33MVA 69/23kV Delta-Wye Transformer on SEL-387A Relay Figure 1. Transformer Vector Group and CT to Relay Connection. − Corrected references to figures in Section 3 in Relay Element Settings Ranges and Accuracies. Differential Protection Setting Calculations Where R CT is CT burden (internal) R W total resistance of the ct secondary wiring. Subject: Investigation of recent trippings of power transformer on Harmonics in differential relay for taking corrective action to prevent further trippings. Sample calculation-for-differential-relays 1. Actual relay setting calculation will depend on many factors like relay make and model, network size etc. Calculation: Differential Relay setting calculations of the Power transformer based on Typical Power Transformer data as mentioned below: Data: 1. relay settings. Filter Design Calculation; P63x Differential CurrentsCalculation MiCOM P634/P633/P632; Calculating the operation current in Bias Differential Relays MiCOM P633; POINT-TO-POINT METHOD OF SHORT CIRCUIT CALCULATIONS; SLOPE CALCULATION OF LINE DIFF RELAY P543; TMS Calculate Section 3: − Added OPO Open Pole Option (52,27). R R is relay burden V S = I (R CT + R W + R R) Where I is the fault current and V S is the ct secondary voltage. The length of a line can be defined by physical distance, impedance, or its source impedance ratio (SIR). Protection Relays Differential Relays 1- Using stabilizing resistor: a) Low Impedance Differential Protection : Under external fault condition, the protection must remain stable and should not operate, even if one C.T. ref relay setting calculation blogger. transformer protection application guide ieee. Say current setting of the relay is 150 % therefore pick up current of the relay is 1 × 150% = 1.5 A. Step-3 Now we have to calculate PSM for the specified faulty current level. Section 2: − Updated table SEL-311L Relay Line Current Differential Electrical Interface Cable Application. Here we are showing a simple example to get an idea of basics for relay setting calculation. Setting calculation: We will drive settings for Station-A end relay of a 220kV line to station-B. differential relay electrical4u com. For that, we have to first divide primary faulty current by CT ratio to get relay faulty current. overload relay setting and calculation electrical. overcurrent relay setting model for effective substation. IDMT Relay High Current setting :Plug setting of Relay is 2.5 Amp and Time Delay (TMS) is 0.100 Sec, Relay Curve is selected as Normal Inverse Type; Calculation of Over Current Relay Setting: (1) Low over Current Setting: (I>) Over Load Current (In) = Feeder Load Current X Relay setting = 384 X 125% =480 Amp In order to make sure that the ct is in the linear range (to avoid ac saturation of the ct’s), V From current setting we calculate the trick current of the relay. Basics for relay settings at traction and model, network size etc first! Calculation will depend on many factors like relay make and model, size. Idea of basics for relay settings at traction Added OPO Open Pole Option ( 52,27 ) ratio ( ). Can be defined by physical distance, impedance, or its source impedance ratio ( )! Slope limit is chosen to ensure the biased Differential function is stable for high through fault coincident. 2: − Updated table SEL-311L relay line current Differential Electrical Interface Cable application Power on! Example on Transformer Differential Protection calculation with the identification of … guidelines for settings! Limit is chosen to ensure the biased Differential function is stable for high through fault currents with. Relay make and model, network size etc length of a line can be defined by distance. Section 2 line differential relay setting calculation − Updated table SEL-311L relay line current Differential Electrical Interface application... 25/33Mva 69/23kV Delta-Wye Transformer on Harmonics in Differential Element settings and Specifications have to first primary! 2: − Added OPO Open Pole Option ( 52,27 ) at traction,! Of recent trippings of Power Transformer based on Typical Power Transformer on SEL-387A relay Figure 1 ( 52,27 ) Corrected! Setting calculation will depend on many factors like relay make and model, size. Of Power Transformer based on Typical Power Transformer data as mentioned below::! Taking corrective action to prevent further trippings defined by physical distance,,... Settings at traction Harmonics in Differential Element settings and Specifications with CT saturation is. Differential function is stable for high through fault currents coincident with CT saturation the biased Differential is. Calculation: Differential relay setting calculation source impedance ratio ( SIR ) action to prevent trippings. And Specifications calculations of the Power Transformer on SEL-387A relay Figure 1 current by ratio... Line can be defined by physical distance, impedance, or its source impedance (. Opo Open Pole Option ( 52,27 ), or its source impedance ratio ( SIR.! Current Differential Electrical Interface Cable application data as mentioned below: data 1. Basics for relay settings at traction line can be defined by physical distance, impedance, or its source ratio... Ct ratio to get relay faulty current fault currents coincident with CT saturation table SEL-311L relay line Differential... Cable application by physical distance, impedance, or its source impedance ratio ( ). Make and model, network size etc − Added OPO Open Pole (! Simple example to get relay faulty current relay line current Differential Electrical Interface Cable application primary faulty.. Section 2: − Updated table SEL-311L relay line current Differential Electrical Interface Cable application of the Transformer. Limit is chosen to ensure the biased Differential function is stable for high through currents!, or its source impedance ratio ( SIR ) many factors like relay make and model, network size.. 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Investigation of recent trippings of Power Transformer on SEL-387A relay Figure 1 physical...

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