GB/T 15543-2008 PDF English
US$70.00 · In stock · Download in 9 secondsGB/T 15543-2008: Power quality -- Three-phase voltage unbalance Delivery: 9 seconds. True-PDF full-copy in English & invoice will be downloaded + auto-delivered via email. See step-by-step procedureStatus: Valid GB/T 15543: Evolution and historical versions
| Standard ID | Contents [version] | USD | STEP2 | [PDF] delivery | Name of Chinese Standard | Status |
| GB/T 15543-2008 | English | 70 |
Add to Cart
|
0-9 seconds. Auto-delivery
|
Power quality -- Three-phase voltage unbalance
| Valid |
| GB/T 15543-1995 | English | 199 |
Add to Cart
|
2 days
|
Quality of electric energy supply. Admissible three-phase voltage unbalance factor
| Obsolete |
Excerpted PDFs (Download full copy in 9 seconds upon purchase)PDF Preview: GB/T 15543-2008
GB/T 15543-2008: Power quality -- Three-phase voltage unbalance---This is an excerpt. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.), auto-downloaded/delivered in 9 seconds, can be purchased online: https://www.ChineseStandard.net/PDF.aspx/GBT15543-2008
GB
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 29.020
K 04
Replacing GB/T 15543-1995
Power Quality - Three-phase Voltage Unbalance
Issued on. JUNE 18, 2008
Implemented on. MAY 1, 2009
Jointly issued by. General Administration of Quality Supervision,
Inspection and Quarantine (GAQSIQ);
Standardization Administration (SAC) of the People's
Republic of China.
Table of Contents
Foreword... 3
1 Scope... 5
2 Normative References... 5
3 Terms and Definitions... 5
4 Voltage Unbalance Factor Limit... 7
5 Conversion of Permissible Values of Voltage Unbalance Factors
Caused by User... 7
6 Measurement and Evaluating of Unbalance Factors... 8
Appendix A (Informative) Calculation of Unbalance Factors... 10
Bibliography... 12
Foreword
This Standard replaces GB/T 15543-1995 "Quality of Electric Energy Supply -
Admissible Three-phase Voltage Unbalance Factor".
Compared with GB/T 15543-1995, main contents revised in this Standard are as
follows.
— Application scope of this Standard is revised; clearly define that "Instant and
temporal unbalance factor problems are not applicable to this Standard".
— Relevant content on Zero-sequence Unbalance Factor of Low-voltage
Distribution System Low-voltage Distribution System is added; all "unbalance
factors" of the previous standard are replaced by "negative-sequence
unbalance factors".
— "Measurement and Evaluating of Unbalance Factors" in the appendix of
previous standard is upgraded to main text of this Standard; and adjustment is
made on measuring time and measuring method. For unbalance factors caused
by fluctuating load, the measuring time is 24h; measuring time interval of each
unbalance factor is 1min. For the common coupling point of the system, the
measuring time is adjusted to 1 week; measurement interval of each unbalance
factor is the integral multiple of 1 min.
— Because measuring method becomes part of the new standard content, the
name of this Standard is changed; "Admissible Three-phase Voltage Unbalance
Factor" is changed to "Three-phase Voltage Unbalance". At the same time,
adjustment is made to the English translation of "power quality", which
maintains consistency with the power quality used in other standards.
— content of "Normative References" is added; and terms are expanded.
— Clearly specify that three-phase unbalance factor is the unbalance factor of the
fundamental-wave component.
— Adjust the content of "Unbalance Factor Calculation" in the appendix.
Appendix A is informative.
This Standard was proposed by and shall be under the jurisdiction of National
Technical Committee on Voltages, Current Ratings and Frequencies of
Standardization Administration of China.
Drafting organizations of this Standard. Wuhan Guoce Science and Technology Co.,
Ltd, China Electric Power Research Institute, China Productivity Center for Machinery,
Wuhan High Voltage Institute of State Grid, China Railway Siyuan Survey and Design
Group Co., Ltd, Wuhan Iron and Steel (Group) Corp., and Harbin Research Institute of
Electrical Instruments.
Chief drafting staffs of this Standard. Hou Tiexin, Bu Zhengliang, Lin Haixue, Liu Xun,
Li Shusen, Huang Zuping, Zou Jiaping, Zhang Jianping, Mei Guihua, and Li
Zhaoyang.
Participating drafting staffs of this Standard. Jing Deyan, Gu Wen, Zeng Youtian, Wu
Mingli, Wang Wei, Lin Xiang Nin, and Wu Lijun.
The previous edition replaced by this Standard is.
— GB/T 15543-1995.
Power Quality - Three-phase Voltage Unbalance
1 Scope
This Standard specifies limits, calculation, measurement and evaluation methods of
three-phase voltage unbalance.
This Standard is applicable to, AC power system of which the nominal frequency is
50Hz is operated in normal mode, voltage unbalance at common coupling point
caused by negative-sequence fundamental-wave component; and voltage unbalance
at common coupling point caused by zero-sequence fundamental-wave component of
the low-voltage system.
Voltage permissible unbalance factor and permissible value of negative-sequence
current of rated condition of electrical equipment shall still be specified by the various
standards, for example, rotating motors shall meet the requirements in GB 755.
Instantaneous and momentary unbalance problem are not applicable to this Standard.
2 Normative References
The following documents contain provisions which, through reference in this Standard,
constitute provisions of this Standard. For dated reference, subsequent amendments
(excluding corrigendum) or revisions of these publications do not apply. However,
parties who enter in agreement based on this Standard are encouraged to investigate
the possibility of applying the most recent editions of the standards indicated below.
For undated references, the latest edition of the normative document is applicable to
this Standard.
GB/T 156-2007 Standard Voltage (IEC 60038.2002, MOD)
GB/T 12325 Power Quality - Deviation of Supply Voltage
3 Terms and Definitions
The following terms and definitions apply to this Standard.
3.1
Voltage unbalance
Three-phase voltage is different in amplitude or (and) the phase difference is not 120°,
or both.
3.2
Unbalance factor
It refers to the unbalanced degree of three-phase in the three-phase power system. It
is represented by square mean root value percentage BETWEEN voltage, current
negative-sequence fundamental-wave component or zero-sequence
fundamental-wave component AND positive-sequence fundamental-wave component.
Voltage, current negative-sequence unbalance factor and zero-sequence unbalance
factor are respectively represented by 2U, 0U, 12 and 10.
3.3
Positive-sequence component
It is the component of the positive-sequence symmetric system, after the electric
quantity of the unbalanced three-phase system is decomposed according to the
symmetrical component method.
3.4
Negative-sequence component
It is the component of the negative-sequence symmetric system, after the electric
quantity of the unbalanced three-phase system is decomposed according to the
symmetrical component method.
4 Voltage Unbalance Factor Limit
4.1 Voltage unbalance factor limit for common coupling point of the electric power
systems is.
If the power grid is normally operated, unbalance factor of the negative-sequence
voltage shall be less than or equal to 2%; the temporary negative-sequence voltage
unbalance factor shall not be more than 4%.
5 Conversion of Permissible Values of Voltage Unbalance Factors Caused by User
Permissible values of voltage unbalance factors usually, in accordance with the
normal minimum short circuit capacity of the coupling points, can be converted into
the corresponding negative-sequence current value, and be used as the basis of
analysis or measurement & calculation.
6 Measurement and Evaluating of Unbalance Factors
6.1 Measurement conditions
Measurement shall be carried out when the electric power system is normally
operated in the minimum mode (or smaller mode), and the unbalanced load is under
normal condition and continuously operation. And ensure that the maximum work
cycle of the unbalanced load is included.
6.2 Measurement time
For common coupling point of the electric power system, duration time of
measurement is 1 week (168h); measurement interval of each unbalance factor can
be integral multiples of 1min.
6.3 Measurement evaluating
For common coupling point of the electric power system, the probability of 95% of 10
min square-mean-root of the supply voltage negative-sequence unbalance factor
measured value shall not be larger than 2%; and the maximum value of all measured
values shall be less than or equal to 4%.
6.4 Measuring instrument for unbalance factors shall meet measurement
requirements of this Standard; instrument record period is 3s; evaluating shall be
according to square-mean-root. Each measurement of fundamental-wave component
of voltage input signal shall use 10-cycle interval. For measuring instrument of
discrete sampling, it is recommended to carry out calculation according to formula (1).
......
Source: Above contents are excerpted from the full-copy PDF -- translated/reviewed by: www.ChineseStandard.net / Wayne Zheng et al.
Tips & Frequently Asked QuestionsQuestion 1: How long will the true-PDF of English version of GB/T 15543-2008 be delivered?Answer: The full copy PDF of English version of GB/T 15543-2008 can be downloaded in 9 seconds, and it will also be emailed to you in 9 seconds (double mechanisms to ensure the delivery reliably), with PDF-invoice. Question 2: Can I share the purchased PDF of GB/T 15543-2008_English with my colleagues?Answer: Yes. The purchased PDF of GB/T 15543-2008_English will be deemed to be sold to your employer/organization who actually paid 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. www.ChineseStandard.us -- GB/T 15543-2008 -- Click this link and select your country/currency to pay, the exact amount in your currency will be printed on the invoice. Full PDF will also be downloaded/emailed in 9 seconds. Question 5: Should I purchase the latest version GB/T 15543-2008?Answer: Yes. Unless special scenarios such as technical constraints or academic study, you should always prioritize to purchase the latest version GB/T 15543-2008 even if the enforcement date is in future. Complying with the latest version means that, by default, it also complies with all the earlier versions, technically. How to buy and download a true PDF of English version of GB/T 15543-2008?A step-by-step guide to download PDF of GB/T 15543-2008_EnglishStep 1: Visit website https://www.ChineseStandard.net (Pay in USD), or https://www.ChineseStandard.us (Pay in any currencies such as Euro, KRW, JPY, AUD).
Step 2: Search keyword "GB/T 15543-2008".
Step 3: Click "Add to Cart". If multiple PDFs are required, repeat steps 2 and 3 to add up to 12 PDFs to cart.
Step 4: Select payment option (Via payment agents Stripe or PayPal).
Step 5: Customize Tax Invoice -- Fill up your email etc.
Step 6: Click "Checkout".
Step 7: Make payment by credit card, PayPal, Google Pay etc. After the payment is completed and in 9 seconds, you will receive 2 emails attached with the purchased PDFs and PDF-invoice, respectively.
Step 8: Optional -- Go to download PDF.
Step 9: Optional -- Click Open/Download PDF to download PDFs and invoice.
See screenshots for above steps: Steps 1~3 Steps 4~6 Step 7 Step 8 Step 9
|