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GB/T 11024.3-2019: Shunt capacitors for a.c. power systems having a rated voltage above 1 000 V -- Part 3: Protection of shunt capacitors and shunt capacitor banks
Status: Valid GB/T 11024.3: Evolution and historical versions
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Shunt capacitors for a.c. power systems having a rated voltage above 1 000 V -- Part 3: Protection of shunt capacitors and shunt capacitor banks
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GB/T 11024.3-2019
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Shunt capacitors for a. c. power systems having a rated voltage above 1kV Part 3: Protection of shunt capacitors and shunt capacitor banks
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GB/T 11024.3-2001
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PDF similar to GB/T 11024.3-2019
Basic data | Standard ID | GB/T 11024.3-2019 (GB/T11024.3-2019) | | Description (Translated English) | Shunt capacitors for a.c. power systems having a rated voltage above 1 000 V -- Part 3: Protection of shunt capacitors and shunt capacitor banks | | Sector / Industry | National Standard (Recommended) | | Classification of Chinese Standard | K42 | | Classification of International Standard | 31.060.70 | | Word Count Estimation | 22,213 | | Date of Issue | 2019-03-25 | | Date of Implementation | 2019-10-01 | | Issuing agency(ies) | State Administration for Market Regulation, China National Standardization Administration | GB/T 11024.3-2019: Shunt capacitors for a.c. power systems having a rated voltage above 1 000 V -- Part 3: Protection of shunt capacitors and shunt capacitor banks
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Shunt capacitors for acpower systems having a rated voltage above 1 000 V - Part 3. Protection of shunt capacitors and shunt capacitor banks
ICS 31.060.70
K42
National Standards of People's Republic of China
Replace GB /Z 11024.3-2001
For nominal AC voltage systems above 1000V
Parallel capacitors - Part 3. Shunt capacitors and
Protection of shunt capacitor banks
Part 3. Protectionofshuntcapacitorsandshuntcapacitorbanks
(IEC /T S60871-3..2015, MOD)
Published on.2019-03-25
2019-10-01 implementation
State market supervision and administration
China National Standardization Administration issued
Content
Foreword III
1 Scope 1
2 Normative references 1
3 Terms and Definitions 1
4 internal fuse 1
4.1 Overview 1
4.2 Fuse characteristics 1
4.3 Effect of capacitor component connection on capacitor life 2
5 External fuses (fuse) 2
5.1 Overview 2
5.2 Fuse characteristics 3
5.3 fuse type 3
5.4 Effect of capacitor bank wiring on fuse selection 5
5.5 Coordination with the bursting curve of the capacitor casing 5
6 Unbalance detection and protection 5
6.1 Role 5
6.2 Types of unbalance protection 5
6.3 Current and voltage transformers 6
6.4 Relay and Protection Setting 7
6.5 Sensitivity 7
6.6 Initial imbalance 7
7 Overload current 8
7.1 Measures 8
7.2 Protected settings 8
7.3 Current transformer 8
7.4 Relay 8
7.5 Protection setting 8
8 overvoltage and undervoltage 8
8.1 Measures 8
8.2 Overvoltage protection 9
8.3 Undervoltage protection 9
8.4 Reclosing 9
9 Other protection 9
9.1 Arrester 9
9.2 Damping device 10
9.3 Synchronous switching 11
10 Security 12
10.1 Discharge device 12
10.2 Metal parts without current carrying 12
Reference 18
Foreword
GB/T 11024 "Parallel capacitors for AC power systems with a nominal voltage above 1000V" is divided into four parts.
--- Part 1. General;
--- Part 2. Aging test;
--- Part 3. Protection of shunt capacitors and shunt capacitor banks;
--- Part 4. Internal fuses.
This part is the third part of GB/T 11024.
This part is drafted in accordance with the rules given in GB/T 1.1-2009.
This part replaces GB /Z 11024.3-2001 "Parallel capacitors for AC power systems with a nominal voltage of 1kV or higher. Part 3.
The protection of the coupling capacitor and the shunt capacitor bank, compared with GB /Z 11024.3-2001, the main technical changes are as follows.
--- The rated voltage of the fuse is selected according to GB/T 15166.4 (see 5.2.2);
--- The coefficient in the energy calculation formula has been verified to use "159" in the original IEC text (see 5.3.2, 5.3.1 of the.2001 edition);
---Modified the energy limit of the jet fuse (see 5.3.2, 5.3.1 of the.2001 edition);
--- Change the "volume" to "volume" (see Figure 2, Figure 2 of the.2001 version);
--- Revised the formula for calculating the maximum peak value of the inrush current when the capacitor bank is put into the power supply (see 9.2.2, version 9.2.2 of.2001);
--- Added provisions on simultaneous switching (see 9.3).
This part uses the redrafting method to modify the use of IEC /T S60871-3.2015 "nominal voltage 1000V or more AC power system
Parallel capacitors - Part 3. Protection of shunt capacitors and shunt capacitor banks. Technical differences with IEC /T S60871-3.2015
And its reasons are as follows.
---About the normative reference documents, this part has made technical adjustments to adapt to China's technical conditions, adjustments
The situation is reflected in Chapter 2, “Regulatory Citations”, and the specific adjustments are as follows.
● Replace IEC 60871-1 with GB/T 11024.1 modified to adopt international standards;
● Replace IEC 60871-4 with GB/T 11024.4 modified to international standards;
● Replace IEC 60549 with GB/T 15166.4 modified to international standards.
---Applicable to capacitors specified in GB/T 11024.1, the insulation level and voltage level are applicable to IEC TS60871-3.2015
The difference in IEC 60871-1 (see Chapter 1);
--- Modified the rated current of the fuse in the external fuse, according to the rated current of the capacitor 1.37 times ~ 1.50 times (see
5.2.1);
---Modified the power bearing capacity of the fuse base (see 5.2.1);
---Modified the fuse of the jet fuse, the corresponding value of the partial melting current (see Table 1);
--- Added imbalance detection and protection to determine the setting of relay protection (see Chapter 6);
--- Adjusted the name of some types of unbalanced protection (see Chapter 6);
--- Added Figure 7b), because the neutral point ungrounded star connection is widely used in China's 66kV and below systems [see
Figure 7b)];
--- The allowable value of the initial imbalance is adjusted according to the general protection principle of China (see 6.6);
--- The formula for modifying the maximum peak value of the inrush current is due to the maximum peak value of the inrush current when the capacitor bank is put into the power supply in the international standard.
Calculate the formula without taking into account the power supply effects (see 9.2.2);
--- Removed the requirement that "for economic reasons, two discharge reactors are usually connected between two-phase lines and wires", this wiring
The formula has been banned in China (see IEC 60871-3.2015, 10.1.3).
This section has made the following editorial changes.
--- Rewritten Chapter 1 in accordance with the requirements of GB/T 1.1-2009.
Please note that some of the contents of this document may involve patents. The issuing organization of this document is not responsible for identifying these patents.
This part was proposed by China Electrical Equipment Industry Association.
This part is under the jurisdiction of the National Power Capacitor Standardization Technical Committee (SAC/TC45).
This section drafted by. Xi'an High Voltage Electric Apparatus Research Institute Co., Ltd., Shenzhen Sanhe Power Technology Co., Ltd., Wuxi赛晶
Capacitor Co., Ltd., Xi'an Xidian Power Capacitor Co., Ltd., Wujiang City Suhang Electric Co., Ltd., Global Energy Internet Research
Research Institute Co., Ltd., New Northeast Electric Group Power Capacitor Co., Ltd., Guilin Power Capacitor Co., Ltd., Xi'an ABB Power
Container Co., Ltd., State Grid Zhejiang Electric Power Company Electric Power Research Institute, State Grid Zhejiang Electric Power Company Shaoxing Power Supply Company, Xiamen Fala Electric
Subsidiary Co., Ltd., Anhui Huawei New Energy Co., Ltd., Shanghai Cooper Power Capacitor Co., Ltd., Shanghai Siyuan Power Capacitor Co., Ltd.
Company, State Grid Anhui Electric Power Company Electric Power Research Institute, Herong Electric Co., Ltd., Rixin Electric (Wuxi) Co., Ltd., Guangdong Electric
Electric Power Research Institute of Network Co., Ltd., Henan Yuyuan Zhongyuan Power Capacitor Co., Ltd., State Grid Sichuan Electric Power Company Power Science
Research Institute, Shaoxing Shangyu Power Capacitor Co., Ltd., Shandong Taikai Power Electronics Co., Ltd., Zhiyue Group Co., Ltd., Shanghai Yongjin Electric
Gas Group Co., Ltd., Anhui Source Photoelectric Apparatus Co., Ltd., Wuxi Haorui New Energy Technology Co., Ltd.
The main drafters of this section. Jia Hua, Lu Wei, Yang Yimin, Yuan Fuxing, Fang Jinlan, Zhao Xin, He Manchao, Yang Changxing, Dai Chaobo, Ge Jinping,
Li Huaiyu, Zhao Qicheng, Lei Qiaoshu, Chen Xiaoyu, Huang Shunda, Liu Jing, Jiang Yuxiang, Shen Xiaoyi, Wang Chongxi, Dong Haijian, Hu Xuebin, Wang Yao, Yan Hongyue,
Ma Zhiqin, Feng Xiuqin, Tao Mei, Guo Qingwen, Zhang Zongxi, Zhou Chunhong, Chen Baifu, Wan Peng, Wang Peibo, Wang Dong, Qian Junyi, Wang Minghao, Zhang Xinyu,
Fu Zhongxing, Zhao Yanjun.
The previous versions of the standards replaced by this section are.
---GB /Z 11024.3-2001.
For nominal AC voltage systems above 1000V
Parallel capacitors - Part 3. Shunt capacitors and
Protection of shunt capacitor banks
1 Scope
This part of GB/T 11024 specifies the protective guidelines for shunt capacitors and shunt capacitor banks.
This section applies to capacitors in accordance with GB/T 11024.1.
2 Normative references
The following documents are indispensable for the application of this document. 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 11024.1 Parallel capacitors for AC power systems with nominal voltages up to 1000 V. Part 1. General
(GB/T 11024.1-2019, IEC 60871-1.2014, MOD)
GB/T 11024.4 Parallel capacitors for AC power systems with nominal voltages up to 1000 V. Part 4. Internal fuses
(GB/T 11024.4-2019, IEC 60871-4..2014, MOD)
GB/T 15166.4 High-voltage AC fuses - Part 4. Fuse for external protection of shunt capacitors (GB/T 15166.4-2008,
IEC 60549. 1976, MOD)
3 Terms and definitions
The terms and definitions defined in GB/T 11024.1, GB/T 11024.4, and GB/T 15166.4 apply to this document.
4 internal fuse
4.1 Overview
The internal fuse of the shunt capacitor is a selective current limiting fuse disposed inside the capacitor. According to GB/T 11024.4
The internal fuse is designed to isolate the faulty capacitor component, allowing the rest of the capacitor unit and the capacitor to be connected.
The capacitor bank of the element continues to operate.
The internal fuse action is caused by breakdown of the capacitor element. The faulty component is instantly disconnected by the action of the component fuse without interruption
The operation of the capacitor.
The number of capacitors connected in parallel externally and the short-circuit current achievable by the power system do not affect the current limit of the internal fuse.
It should be noted that the internal fuse does not provide protection against short circuits between the internal wires or short circuits between the live parts and the case, and both cases
Both may cause the casing to burst.
4.2 Fuse characteristics
4.2.1 Rated current
There are no definitions and test methods for component fuse rated current.
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