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Synchronous Generator Impedance Correction Factor The synchronous generator impedance correction factor K G for generators without unit transformers oec calculated as follows per section 3. Subtransient impedances are used for rotating machines with the impedance correction factors. EasyPower applies impedance correction factors in short circuit calculation based on IEC standard. View of the single line diagram in the time current characteristics TCC plot for protective devices. Voltage Factors c The voltage factor c is used to scale the equivalent voltage source in the calculations to account for variations in the system voltage. The transformer correction factor K Oec for two winding units with or without on-load tap changer LTC is calculated as follows per section 3.
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The following methods are supported for meshed networks as per section 4. High voltage circuit breaker data comes with the DC time constant. In the equipment short-circuit duty report, comments and text colors provide indication of problem areas. Ratings for HV breaker in project file loaded from the library In the equipment short-circuit duty report, comments and text colors provide indication of problem areas. Symmetrical currents are applied for relays with DC offset filter. IEC Short-Circuit in EasyPowerįor breaking current you can choose from 0. The phase angles displayed are relative to the applied equivalent voltage source being at zero angle.įor minimum short-circuit calculations the motor contribution is excluded. Example HV breaker ratings in the device library Figure 4: The voltage factor c is used to scale the equivalent voltage 60909-11 in the calculations to account for variations in the system voltage. Systems – Part 1: Factors for the Calculation of Short-Circuit Currents According to IECĪsymmetrical currents for the initial and the four breaking time intervals are also calculated for use in protective device coordination. IEC/TR Short-Circuit Currents in Three-Phase a.c. Systems Part 1: Factors for the Calculation of Short-Circuit Currents in Three-Phase A.C. IEC Short-Circuit Current Calculation in Three-Phase A.C. systems – Part 1: Factors for the calculation of short-circuit. IEC TS Standard | Short-circuit current calculation in three-phase a.c.