IEC 60909-1 PDF

IEC TS Standard | Short-circuit current calculation in three-phase a.c. systems – Part 1: Factors for the calculation of short-circuit. IEC Short-Circuit Current Calculation in Three-Phase A.C. Systems Part 1: Factors for the Calculation of Short-Circuit Currents in Three-Phase A.C. IEC/TR Short-Circuit Currents in Three-Phase a.c. Systems – Part 1: Factors for the Calculation of Short-Circuit Currents According to IEC

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U nQ is the nominal system voltage at the feeder connection point Q of the power station unit. IEC section 6 provides a sample calculation as a benchmark test for software programs to compare. Protecting Revenues with Advanced Compliance: Also, all synchronous machines use the resistance R Gf in place of R G in accordance with section 3.

Sign In Your Account. For remote buses and branches across transformers, a phase angle shift is applied accordingly by the short circuit calculations. This website is best viewed with browser version of up to Microsoft Internet Explorer 8 or Firefox 3. For minimum short-circuit currents, the resistances are based on the estimated temperature at the end of the short-circuit condition.

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. For TCC clipping you can choose one from initial, breaking and steady state currents.

PD 7639-1:1994, IEC 60909-1:1991

The implementation is as per sections 4. Please refer to our privacy policy for more information. Learn more about the cookies we use and how to change your settings.


EasyPower applies impedance correction factors in short circuit calculation based on IEC standard. The values can be displayed in magnitude, magnitude and angle, or in real and imaginary quantities.

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6099-1 The following features are supported: General rules and orthogonal representation Price: Capacitors and non-rotating loads are not included in the calculations. The comparison of results is summarized below. This product hasn’t received any reviews yet.

Z THV is the impedance of the unit transformer referred to the high-voltage side without 609909-1 factor K T. Medical device software – Software life cycle processes. You may find similar items within these categories by selecting from the choices below:. Subtransient impedances are used for rotating machines with 60909-11 impedance correction factors.

In a system of low voltage breakers with ZSI, when the current through any circuit breaker exceeds the short time pickup its restraining signal is sent to upstream circuit breakers.

The short-circuit current through any protective device can be used to clip the TCC curve of the device. The faster, easier way to work with standards.

You can insert tick marks arrows in the TCC plot to indicate the short-circuit current through the device. Short-circuit current calculation in three-phase a. Short-circuit duty results displayed in the ief line drawing Table 5: Symmetrical currents are applied for relays with DC offset filter. Click to learn more.


You can view the currents in various formats such as phase currents for A, B and C phases or in symmetrical components: Asymmetrical Currents Asymmetrical currents for the initial and the four breaking time intervals are also calculated for use in protective device coordination. IEC standard specifies clock number notation and their respective phase angle isc for transformers.

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The transformer correction lec K T for two winding units with or without on-load tap changer LTC is calculated as follows per section 3.

For ifc with delta and start wye winding connections, the clock notations 1,3,5,7,9 and 11 are supported in the database. Factors for the calculation of short-circuit currents according to IEC For phase TCC clipping and tick marks, EasyPower automatically selects the asymmetrical currents for low voltage circuit breakers, fuses and electromechanical relays.

In the equipment short-circuit duty report, comments and text colors provide indication of problem areas. EasyPower uses the equivalent voltage source at the short-circuit location, symmetrical components impedance network, and the voltage factor c as described in section 2.

Customers Also Bought Codes for the representation of names of languages — Part 2: EasyPower calculates the Peak currents i p based on section 4.

Asymmetrical values can be used with protective devices that respond to the asymmetrical currents.