GB/T 15544.1-2023Short-circuit current calculation in three-phase a. c. systems - Part 1: Calculation of currents (English PDF)

GB/T 15544.1-2023 is the English-translated version of 三相交流系统短路电流计算 第1部分：电流计算.

GB/T 15544.1-2023 is the Chinese standard "Short-circuit current calculation in three-phase a. c. systems - Part 1: Calculation of currents".

Its scope clause reads: This document specifies the method for calculating the short-circuit current in a three-phase AC system with a rated frequency of 50 Hz: The short-circuit points proposed in this document, etc: Effective voltage source method is a simple and practical calculation method for short-circuit current, and its calculation results generally have acceptable accuracy: If possible It is enough to obtain the same calculation accuracy, and does not exclude the use of other calculation methods, such as the superposition method: The short-circuit current calculated by the superposition method depends on A specific flow, and therefore not necessarily the maximum short-circuit current: This document applies to short-circuit current calculations for both balanced and unbalanced short-circuit faults: This document does not apply to ungrounded neutral or Calculation of short-circuit current for a single-phase-to-ground fault in a resonant grounded system: This document is not applicable under controlled conditions (short circuit test station) Man-made short-circuit and short-circuit calculation of electrical equipment for aircraft and ships: In the neutral point ungrounded or resonant grounded system, when two independent single-phase ground short-circuit faults occur simultaneously, the calculation of the short-circuit current is given in GB/T 15544:4-2017: Short-circuit current and short-circuit impedance can also be determined through system test, system analysis instrument measurement or digital computer: in the existing low pressure In the system, the short-circuit impedance can be obtained by measuring the expected short-circuit point: The calculation of short-circuit impedance is usually based on the rated parameters of the power equipment and the topology of the system: The advantage of this method is that it can be applied In existing systems, it can also be applied to planning systems: Normally, two short-circuit currents with different magnitudes need to be calculated: ---Maximum short-circuit current, used to select the capacity or rated value of electrical equipment; --- Minimum short-circuit current, used to select fuses, set protection settings or check induction motor startup: Note: It is assumed that the three-phase short-circuit current is generated due to the simultaneous short-circuit of the three phases: Since the three phases are not short-circuited at the same moment, there may be a large short-circuit current The study of the DC component is outside the scope of this document:. Its clauses include terms and definitions.

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This preview omits tables, figures, formulas and parts of the technical clauses. The complete document — 91 pages — is available in the English PDF.

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