|
US$794.00 · In stock
Delivery: <= 4 days. True-PDF full-copy in English will be manually translated and delivered via email.
GB/T 15544.4-2017: Short-circuit current calculation in three-phase a.c. systems -- Part 4: Currents during two separate simultaneous line-to-earth short circuits and partial short-circuit currents flowing through earth
Status: Valid
| Standard ID | Contents [version] | USD | STEP2 | [PDF] delivered in | Standard Title (Description) | Status | PDF |
| GB/T 15544.4-2017 | English | 794 |
Add to Cart
|
4 days [Need to translate]
|
Short-circuit current calculation in three-phase a.c. systems -- Part 4: Currents during two separate simultaneous line-to-earth short circuits and partial short-circuit currents flowing through earth
| Valid |
GB/T 15544.4-2017
|
PDF similar to GB/T 15544.4-2017
Basic data | Standard ID | GB/T 15544.4-2017 (GB/T15544.4-2017) | | Description (Translated English) | Short-circuit current calculation in three-phase a.c. systems -- Part 4: Currents during two separate simultaneous line-to-earth short circuits and partial short-circuit currents flowing through earth | | Sector / Industry | National Standard (Recommended) | | Classification of Chinese Standard | F20 | | Classification of International Standard | 29.240.20 | | Word Count Estimation | 42,497 | | Date of Issue | 2017-12-29 | | Date of Implementation | 2018-07-01 | | Issuing agency(ies) | General Administration of Quality Supervision, Inspection and Quarantine of the People's Republic of China, Standardization Administration of the People's Republic of China | GB/T 15544.4-2017: Short-circuit current calculation in three-phase a.c. systems -- Part 4: Currents during two separate simultaneous line-to-earth short circuits and partial short-circuit currents flowing through earth
---This is a DRAFT version for illustration, not a final translation. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.) will be manually/carefully translated upon your order.
Short-circuit current calculation in three-phase acsystems - Part 4. Currents during two separate simultaneous line-to-earth short circuits and partial short-circuit currents flowing through earth
ICS 29.240.20
F20
National Standards of People's Republic of China
Calculation of Short Circuit Current in Three - phase AC System
Part 4. Simultaneous two independent single-phase ground
Current at fault and current through the earth
Part 4. Currentsduringtwoseparatesimultaneousline-to-earthshortcircuits
(IEC 60909-3..2009, Short-circuit currentinthree-phasea.c.systems-
Part 3. Currentsduringtwoseparatesimultaneousline-to-earthshortcircuits
andpartialshort-circuitcurrentsflowingthroughearth, IDT)
2017-12-29 published.2018-07-01 implementation
General Administration of Quality Supervision, Inspection and Quarantine of People's Republic of China
China National Standardization Administration released
Directory
Foreword Ⅲ
1 Scope 1
2 Normative references 1
3 Terms and definitions 1
4 symbol 4
5 At the same time, two independent single-phase to ground short-circuit current 5
5.1 Symmetrical short circuit current initial value 5
5.2 Short-circuit current peak, symmetrical breaking current and steady-state short-circuit current 7
5.3 The simultaneous occurrence of two independent single-phase ground short circuit to ground short circuit current distribution 7
6 In the case of asymmetrical short-circuit through the grounding of the local short-circuit current 7
6.1 Overview 7
6.2 single-phase grounding within the plant 7 short circuit
6.3 Single-phase short-circuit outside the plant 9
6.4 single-phase ground near the plant short circuit 10
7 Reduction factor of overhead lines with ground 11
8 Current distribution and reduction factor calculation of metal sheath or shielded grounding cable 12
8.1 Overview 12
8.2 Three-core cable 12
8.3 Three single-core cable 15
Appendix A (informative) Simultaneous two independent single-phase ground short circuit calculation example 18
Appendix B (Informative) Short-circuit current through the earth calculation example 20
Appendix C (informative) Three-core cable reduction factor and ground current distribution calculation example 27
Appendix D (informative) three single-core current reduction factor r3 and ground current distribution calculation example 31
Foreword
GB/T 15544 "three-phase AC system short-circuit current calculation" is divided into the following five parts.
--- Part 1. Current calculation;
--- Part 2. Short-circuit current calculation of the application of the coefficient;
--- Part 3. Electrical equipment data;
--- Part 4. Simultaneous two separate single-phase ground fault current and the current flow through the earth;
--- Part 5. Example.
This section GB/T 15544 Part 4.
This section drafted in accordance with GB/T 1.1-2009 given rules.
This section uses the translation method is equivalent to using IEC 60909-3..2009 "Three-phase AC system short-circuit current calculation Part 3. Simultaneous
Current at two independent single-phase ground faults and current through the earth. "
This section made the following editorial changes.
--- In line with the existing standard series, the standard name was changed to "three-phase AC system short-circuit current calculation Part 4. Simultaneous
Current at two independent single-phase ground faults and current through the earth. "
This part is proposed by China Electricity Council.
This part of the national standardization of short-circuit current calculation Technical Committee (SAC/TC424) centralized.
This section is drafted. China Electric Power Research Institute, State Grid Corporation of China State Power Dispatching and Communication Center, Xi'an Jiaotong University.
The main drafters of this section. Tom Chung, Li Ming Festival, Bu Guang Quan, Zhang Yan Tao, Zhou Ji, Guo Qiang, Shi Haobo, Zhang Yuhong, Duan Xiangying, Han Jiahui,
Xiao Ti.
Calculation of Short Circuit Current in Three - phase AC System
Part 4. Simultaneous two independent single-phase ground
Current at fault and current through the earth
1 Scope
GB/T 15544 This section gives the expected high-voltage three-phase AC system (50Hz or 60Hz) in the case of short circuit imbalance expected short
Current calculation steps, namely.
a) current at the same time as two independent single-phase-to-ground shorts occur simultaneously in a neutral ungrounded system or in a neutral high-impedance earthed system;
b) Neutral direct or neutral low-impedance grounding system occurs in the case of a single-phase ground short circuit through the local
Short circuit current.
The current calculated using these calculation steps is used to determine the induced voltage, contact voltage or voltage across the power plant or substation and overhead line tower
Step voltage and ground potential rise.
This calculation gives the calculation of the reduction factor for one or two overhead lines.
This section does not include.
a) Short-circuit current specifically generated under controlled conditions (such as in a short-circuit test station);
b) short-circuit current in the electrical installation of a ship or aircraft;
c) Neutral or ungrounded Neutral A single-phase ground fault occurs in a high-impedance grounded system.
The purpose of this section is to develop practical, concise steps for the calculation of two separate single-phase ground short-circuit ground short-circuit
Flow, and partial short-circuit current from the electrical equipment through the ground and the ground of the earth or overhead lines and the sheath or shield of the cable,
Conservative results with sufficient accuracy. For this purpose, an equivalent voltage source is introduced at the place of a short circuit and all other voltage sources are assumed to be zero. When calculated short
Road short circuit current, the station ground impedance and tower line tower overhead resistance to be ignored.
This section is to supplement GB/T 15544.1. Basic definitions, symbols and calculation assumptions can be found in GB/T 15544.1. Headquarters
Only a few special projects are defined or explained.
Calculation of short-circuit parameters in accordance with the electrical equipment rated data, the system topology, which makes short-circuit calculation can be applied to existing systems or regulations
Scheduling system. This section does not exclude other algorithms that can achieve the same accuracy under certain conditions, such as overlay.
As described in GB/T 15544.1, short-circuit current and its parameters can also be determined by the system test.
2 Normative references
The following documents for the application of this document is essential. For dated references, only the dated version applies to this article
Pieces. For undated references, the latest edition (including all amendments) applies to this document.
GB/T 15544.1-2013 Three-phase AC system short-circuit current calculation - Part 1. Current calculation (IEC 60909-0..2001,
IDT)
GB/T 15544.3-2017 Three-phase AC system short-circuit current calculation - Part 3. Electrical equipment data (IEC /T R60909-2.
2008, IDT)
3 Terms and definitions
The following terms and definitions apply to this document.
Tips & Frequently Asked Questions:Question 1: How long will the true-PDF of GB/T 15544.4-2017_English be delivered?Answer: Upon your order, we will start to translate GB/T 15544.4-2017_English as soon as possible, and keep you informed of the progress. The lead time is typically 2 ~ 4 working days. The lengthier the document the longer the lead time. Question 2: Can I share the purchased PDF of GB/T 15544.4-2017_English with my colleagues?Answer: Yes. The purchased PDF of GB/T 15544.4-2017_English will be deemed to be sold to your employer/organization who actually pays for it, including your colleagues and your employer's intranet. Question 3: Does the price include tax/VAT?Answer: Yes. Our tax invoice, downloaded/delivered in 9 seconds, includes all tax/VAT and complies with 100+ countries' tax regulations (tax exempted in 100+ countries) -- See Avoidance of Double Taxation Agreements (DTAs): List of DTAs signed between Singapore and 100+ countriesQuestion 4: Do you accept my currency other than USD?Answer: Yes. If you need your currency to be printed on the invoice, please write an email to [email protected]. In 2 working-hours, we will create a special link for you to pay in any currencies. Otherwise, follow the normal steps: Add to Cart -- Checkout -- Select your currency to pay.
|