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Code for design electric power supply systems
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| GB 50052-1995 | English | 839 |
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Code for design of electric power supply systems
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Basic data | Standard ID | GB 50052-2009 (GB50052-2009) | | Description (Translated English) | Code for design electric power supply systems | | Sector / Industry | National Standard | | Classification of Chinese Standard | P63 | | Classification of International Standard | 91.140.50 | | Word Count Estimation | 75,784 | | Date of Issue | 2009-11-11 | | Date of Implementation | 2010-07-01 | | Older Standard (superseded by this standard) | GB 50052-1995 | | Quoted Standard | GB 12326; GB/T 14549; GB/T 15543 | | Regulation (derived from) | Bulletin of the Ministry of Housing and Urban No. 437 | | Issuing agency(ies) | Ministry of Housing and Urban-Rural Development of the People's Republic of China; General Administration of Quality Supervision, Inspection and Quarantine of the People's Republic of China | | Summary | This Chinese standard applies to new construction, expansion and renovation project client supply and distribution system design. | GB 50052-2009: Code for design electric power supply systems---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/GB50052-2009
NATIONAL STANDARD
OF THE PEOPLE'S REPUBLIC OF CHINA
Code for Design Electric Power Supply Systems
Issued on: NOVEMBER 11, 2009
Implemented on: JUNE 1, 2010
Jointly Issued by .Ministry of Housing and Urban-Rural Construction of the People's
Republic of China
General Administration of Quality Supervision, Inspection and
Quarantine of the People's Republic of China
Foreword
In accordance with the requirements of "Notice on Printing and Distributing ' 200 1 ~2002
Development and Revision Plan of National Engineering Construction Standard'" (Jian Biao [2005]
No. 85) issued by the former Ministry of Construction, this standard is revised by China United
Engineering Corporation jointly with the related design research units.
The revision group of this code, upon studying the former code, investigate and research
extensively; learn from practical experience; and refer to the related international standards as well as
pioneering oversea standards; as a result, they have finished the first draft, exposure draft, and the
examination draft hereof. This code is finally approved by the related department.
This code consists of 7 chapters. general provisions, terms, load classification and power supply
requirement, power source and power supply system, voltage selection and quality of electric energy,
reactive power compensation and LV distribution .
The revised main content is stated below.
1. The application scope of the former code is adjusted;
2. "Distributed generation is available; efficiency of energy utilization is high, economic and
rational" is one of the conditions to set up self-contained power; "in special cases, when electric
source for safety services is switched to normal power supply, both of which are needed to be run
simultaneously, safe operation measures shall be taken" are added in this code; and 660V LV
distribution voltage is listed in this code for the first time;
3. The major techniques involved in reserved chapters are supplemented, improved and
necessarily modified .
The provisions printed in bold type are compulsory ones and must be enforced strictly.
The Ministry of Housing and Urban-Rural Development is in charge of the explanation of the
compulsory provisions; China Machinery Industry Federation is responsible for the routine management;
and China United Engineering Corporation is responsible for the explanation of specific technical
contents. All relevant organizations are kindly requested to sum up and accumulate your experiences in
actual practices during the process of implementing this code. The relevant opinions and advice,
whenever necessary, can be posted or passed on to China United Engineering Corporation (address.
No. 33 8, Shiqiao Road, Hangzhou City, Zhejiang Province 310022, China; E-mail. lusx@chinacuc.
corn or chenjl@ chinacuc.com) for future reference during revision .
The Governing Organization, Chief Development Organization, Participating Development
Organizations, Chief Drafting Staff and Chief Review Staff.
Governing Organization. Exploration & Design Association of China National Machinery Industry
Chief Development Organization. China United Engineering Corporation
Patiicipating Organizations. China Huanqiu Contracting & Engineering Corporation, China
Aeronautical Project &Design Institute, Northwest Electric Power
Design Institute of China ยท Power Engineering Consulting Group
Corporation, China Construction Design International (Shenzhen)
Table of Contents
General Provisions ... 1
2 Tenns ... 2
3 Load Classification and Power Suppiy Requirement... 4
4 Power Source and Power Supply System ... 6
5 Voltage Selection and Quality of Electric Energy ... 7
6 Reactive Power Compensation ... 10
7 LV Distribution ... 13
Explanation of Wording in This Code ... 14
List of Quoted Standards ... 15
1 General Provisions
1.0.1 This code is developed to implement and execute national technical & economic policy;
achieve personal safety, power supply reliability, state-of-art technology and rational economy during
the design of electric power supply systems.
1.0.2 This code is applicable to the design of construction, extension and renovation for user-
terminal electric power supply systems.
1.0.3 Electric power supply systems shall comprehensively and properly be des igned in accordance
with such factors as load property, power capacity, project characteristics and regional power supply
condition.
1.0.4 The design of electric power supply systems shall meet the current usage and the future
development in accordance with the characteristics, scale and development program of the project.
1.0.5 Advanced electrical products, meeting the requirements of national current standard and with
such properties as high efficiency, energy conservation, environmental-friendliness as well as being
safety shall be adopted in electric power supply systems.
1.0.6 This code specifies the basic technical requirements for the design of electric power supply
systems. In case this code conflicts with the provisions in national laws and administrative regulations,
the later prevails.
1.0. 7 The design of electric power supply systems shall meet the requirements stated in this code
and those in the national current and relevant standards.
2 Terms
2.0.1 Vital load in first grade load
Load which may cause poisoning, explosion, fire disaster, etc. due to power supply interruption,
or the one for which power supply must not be interrupted in vital places.
2.0.2 Duplicate supply
One load power-supplied by two circuits, which are mutually independent in terms of safety
power supply.
2.0.3 Electric supply systems for safety services
Power supply system which is used to maintain the operation of electrical equipments and electric
apparatuses; to keep the health and safety of both humans and livestock; and/or to avoid the damages
of environment or other equipments.
Note. Power supply system includes the electric circuit connected from power box to electrical equipment terminals. On certain
occasions, it may also involve equipments.
2.0.4 Electric source for safety services
Power supply being used as the components of electric supply systems for safety services.
2.0.5 Stand-by electric source
Power supply, when normal power supply is interrupted, being used to maintain the operation of
electric apparatuses or their partial components due to non-safety factors.
2.0.6 Distributed generation
A distributed generation is mainly referred to generating set (such as micro gas turbine, solar
heating and photovoltaic generation set, fuel cell, wind power generation set and biomass power
. generation set) which is located near power load, compatible with circumstance and can supply
electricity, heat (or coolness); besides, the efficiency hereof is high.
2.0. 7 Inverse voltage regulation mode
It is referred to the mode that the network voltage is raised when load of grid voltage is great and
the network voltage is reduced when the load is small so as to compensate the network voltage loss.
2.0.8 Basic reactive power
Basic reactive power is the minimal reactive power required by electric equipment after its
operation. If the electric equipment may operate with no load, the non-load reactive power is the basic
reactive power. If the minimal operation mode of this equipment is light load operation, the reactive
power under this light load is the basic reactive power.
2.0.9 Isolator
Electrical equipments which protect human's safety before the repair and failure inspection of the
equipment or before human's operation.
2.0.10 TN System
3 Load Classification and Power Supply Requirement
3.0.1 The power load, in accordance with power supply reliability, the effect of personal safety
and economic loss due to power supply interruption, shall be classified, which shall meet the
following provisions.
1 Under one of the following conditions, the load is deemed to the first grade load.
1) Personal injury or death is caused due to power supply interruption.
2) Economy suffers from great loss due to power supply interruption.
3) Normal operations of important power utilization units are effected due to power
supply interruption.
2 Among the first-grade loads, those in which such consequences as major equipment
damage, poisoning, explosion and fire disaster are caused by power supply interruption, or
those that power supply must not be interrupted in vital places, are seemed as the vital load in
first-grade load.
3 Under one of the following conditions, the load is deemed to the second grade load.
1) Economy suffers from comparatively great loss due to power supply interruption.
2) Normal operations of comparatively important power utilization units are effected
due to power supply interruption.
4 Those not belonging to the first and second grade loads shall be seemed as the third
grade load.
3.0.2 First grade load power shall be supplied by duplicate supply. If one power supply fails;
the other shall not be damaged simultaneously.
3.0.3 The power supply of the vital load in first grade load shall meet the following req-
uirements.
1 Besides duplicate supply, electric source for safety services (the electric supply system
for safety servic...
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