GB/T 15544.3-2017 in English

VALID

Short-circuit current calculation in three-phase a.c. systems―Part 3:Data of electrical equipment

Issued on:2017-12-29
Implemented on:2018-07-01
File Format:PDF
Delivery:Via email within 5 business days

Price(USD)： $490.00
$476.00

Standard No:	GB/T 15544.3-2017
Document status:	VALID
Title in English:	Short-circuit current calculation in three-phase a.c. systems―Part 3:Data of electrical equipment
Title in Chinese:	三相交流系统短路电流计算第3部分：电气设备数据
Language:	English
File Format:	Electronic (PDF)
Delivery:	Via email within 5 business days
Issued on:	2017-12-29
Implemented on:	2018-07-01
ICS Classification:	29.240.20-Power transmission and distribution lines
Chinese Classification:	F20-
Professional Classification:	GB-National Standard
Related Topics:	short circuit short circuit current DC short circuit current calculation iec mobile phase system Mobile phase calculation current data Test current and short circuit current gas phase fraction gas phase fraction flow meter data mobile phase system mobile phase equipment Three gas equipment belt current it current in english How to test short circuit current current data block current it Normal Phase System Mobile Phase short circuit current How to measure short circuit current current data device data GB/T 15544.3 GB/T 15544.3-2017 Short-circuit current calculation Three-phase ammeter electric current How to calculate gas phase split ratio Siemens PLC power supply current calculation Calculation method of current ripple coefficient Device data

《GB/T 15544.3-2017三相交流系统短路电流计算第3部分：电气设备数据》由TC424（全国短路电流计算标准化技术委员会）归口，主管部门为中国电力企业联合会。

Introduction

Analysis of the core content of the standard

Equipment type	Key parameters	Typical value range
Synchronous motor	Super transient reactance (X_d^")	0.12~0.35 per unit value
Transformer	Short-circuit voltage percentage (u_k)	9%(10MVA)-13%(1000MVA)
Overhead Lines	Positive Sequence Reactance (X'₁)	0.3~0.4Ω/km(50Hz)

Equipment Data Application Guide

Transformer Selection Case

For 400kV/230kV autotransformer, the standard recommends that the zero-sequence reactance ratio (X₍₀₎/X₍₁₎) be 1.5~3.2. In fact, a project in Austria adopted the parameter X_(0)C=125.3Ω (converted to 400kV side)

Technology Evolution Analysis

This standard inherits IEC TR 60909-2:2008 technical framework, the main changes include:

Added XLPE cable impedance calculation model
Refined the correction factor of synchronous motor saturation reactance
Supplemented the zero-sequence coupling formula of double-circuit lines on the same pole

Implementation suggestions

Nameplate data provided by the manufacturer should be used first for short-circuit calculation
For 110kV and above cables, the influence of metal sheath backflow needs to be considered
The short-circuit current contributed by the asynchronous motor is converted according to I_LR/I_rM=5.5~6.7

More samples: JGJ 94-2008 DL/T 5154-2012 YD/T 3934-2021

Sample only — not a preview of GB/T 15544.3-2017

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