GB/T 11024.1-2019Shunt capacitors for a.c. power systems having a rated voltage above 1 000 V -- Part 1: General (English PDF)

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 first 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/T 11024.1-2010 "Parallel capacitors for AC power systems with a nominal voltage of 1000V or higher"

Points. General Principles, compared with GB/T 11024.1-2010, the main technical content changes are as follows.

---According to China's specific situation, the discharge device outside the capacitor usually uses a discharge coil, so it has been added in the terminology and definition chapter.

The terminology and definition of "discharge coil" (see Chapter 3);

--- Because the overvoltage test has been added to the type test project, the "test unit" and the "comparable element" have been added to the terminology and definition chapter.

Three related terms and definitions, such as "design" and "inter-element insulation" (see Chapter 3);

--- According to the specific circumstances of our country, the test of the external fuses used in capacitors in the type test project was deleted (in the case of device test)

Carry out)" (see 6.3, 6.2 of.2010 edition);

--- In order to clarify the coverage of the type test, at the end of the type test clause, add a sentence "Type test can cover certain

Range of capacitor design, coverage rules as specified in 6.4 of DL/T 840-2016" (see 6.3);

--- Replace the term "durability test" with "aging test" and reinterpret it (see 6.5.1, 6.4 of.2010 edition);

--- Add a "tolerance blasting energy test" in the special test, and interpret it; correspondingly delete the "C.4.2 capacitor" in Appendix C

The type test of the casing is under consideration" (see 6.5.2 and C.4.2,.2010 editions 6.4 and C.4.2);

--- In the three-phase capacitor unit, the ratio of the maximum value to the minimum value of the capacitance measured between any two line terminals is specified to be smaller

Within the scope (see 7.2, 7.2 of the.2010 edition);

--- The AC test voltage and DC test voltage between terminals are modified according to IEC (see Chapter 9, Chapter 9 of the.2010 edition);

--- Modified the qualification criteria for the thermal stability test (see Chapter 13, Chapter 13 of the.2010 edition);

--- Deleted the test method for the positive impact of the capacitor unit in the lightning impulse voltage test between the terminal and the outer casing (see 15.2,

Chapter 16 of the.2010 edition);

--- The overvoltage test is included as a type test item in this section. With the overvoltage cycle test in GB/T 11024.2-2001

Compared with the test method, the test procedure, the number of times of daily application and the total number of times applied by the overvoltage combination have been modified and added

Test item for applying voltage (see Chapter 16, GB/T 11024.2-2001 version 2.1.3.1);

--- Deleted the provisions of the "Inter-terminal voltage test of the unit within 5 min after the test" in the short-circuit discharge test (see

Chapter 17 of the.2010 edition);

--- Modified the standard insulation level according to GB/T 311.1-2012, and added the system nominal voltage of 750kV and 1000kV

Standard insulation level (see 18.1, 18.1 of the.2010 edition);

--- For the installation of equipment above 1000m above sea level, an altitude correction factor for determining the outer insulation performance is proposed (see 18.2.1,

27.8.1) of the.2010 edition;

--- Considering that the capacitor bank has different neutral grounding methods, when the capacitor fails and is disconnected from the power supply, the capacitor may

The overvoltage is different, so the current carrying of the discharge circuit should be discharged under the corresponding different overvoltage peaks.

Requirements for competence (see Chapter 21, Chapter 21 of the.2010 edition);

--- In order to improve safety and security, it is added that "the resonant current generated by the capacitor bank in the no-load state of the transformer should be avoided."

Container" (see 27.6.1);

--- Because the main content of 27.7.2 is the performance of the circuit breaker, the original title of the circuit breaker "no heavy breakdown" is changed to "circuit breaker"

Performance" and modify the content accordingly (see 27.7.2, 27.7.2 of the.2010 edition);

--- Increased the recommended value of the specific creepage ratio selection (see 27.9.1);

--- Revised the data in Table 7 "Relationship between standard lightning impulse withstand voltage and minimum air distance" (see 27.9.2,.2010)

Version 27.9.2);

--- In order to improve safety and security, at the end of C.3, "the fuse should not be severely broken when it is opened"; at the end of C.5.1

Add "Because the structural parts of the fuse are prone to aging and corrosion, it is necessary to replace the fuses whose parts have been rusted and the tail line has been loosened, so as to avoid

Heavy breakdown due to poor breaking performance, resulting in an expansion accident" (see C.3 and C.5.1);

--- The original inrush current calculation formula does not take into account the influence of the power supply. It is only suitable for the case where the capacitor bank is not connected in series with the series reactor, so

GB 50227-2017 has been revised (see D.4,.2010 edition of D.4);

--- Add a paragraph at the end of Appendix E.2. "Capacitors with internal fuses, it is not recommended to use external fuses at the same time" (see appendix

E.2);

--- Because the overvoltage test is included in this part as a type test item, an informative appendix "Component and Capacitor Housing" has been added.

Definition of dimensions" (see Appendix F).

This section uses the redrafting method to modify the use of IEC 60871-1.2014 "parallel voltage 1000V or more AC power system parallel

Capacitor Part 1. General.

This section has a small amount of structural adjustment compared to IEC 60871-1.2014, and the international standard term 3.9 is adjusted to this part.

3.12; 3.10~3.12 is adjusted to 3.9~3.11 of this part; 3.22 is adjusted to 3.26 of this part.

The technical differences between this part and IEC 60871-1.2014 and their 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 60871-4.1996 with GB/T 11024.4-2019 modified to international standards (see Chapter 1, Section

Chapter 6, Chapter 7 and Appendix E);

* Replace IEC 60549 with GB/T 15166.4 modified to international standards (see Appendix C and Appendix E);

* Replace IEC 60060-1 with GB/T 16927.1-2011 modified to international standards (see 5.2 and Chapter 15);

* Replace IEC /T S60815 (all parts) with GB/T 26218 (all parts) modified to international standards, two

The degree of consistency between the various parts of the standard is as follows.

* GB/T 26218.1 Selection and sizing of high-voltage insulators for use under filthy conditions - Part 1. Definitions,

Information and general principles (GB/T 26218.1-2010, IEC /T S60815-1.2008, MOD);

* GB/T 26218.2 Selection and sizing of high-voltage insulators for use under filth conditions - Part 2.

Use porcelain and glass insulators (GB/T 26218.2-2010, IEC /T S60815-2.2008, MOD) (see 27.9.1);

* GB/T 26218.3 Selection and sizing of high-voltage insulators for use under s

Composite insulators (GB/T 26218.3-2011, IEC /T S60815-3.2008, MOD) (see 27.9.1);

* Increased references to GB/T 1984 and DL/T 840-2016;

--- According to the need, in Chapter 3, four phases such as "discharge coil", "test unit", "comparable component design" and "inter-element insulation" were added.

Terms and definitions (see 3.22~3.25);

--- Added in 5.2 "Test Conditions" "The waveform and deviation of the test voltage shall comply with 6.2.1 of GB/T 16927.1-2011"

Claim";

--- In order to clarify the coverage of the type test, at the end of the 6.3 "type test" clause added "type test can cover certain

Range of capacitor design, coverage rules as specified in 6.4 of DL/T 840-2016";

--- According to the specific situation of China, a "tolerance of blasting energy test" was added to the 6.5 "special test", and the corresponding deletion was

The relevant content of "C.4.2 Type test of capacitor casing is under consideration" in Appendix C;

--- According to the specific situation of China, the allowable value of the capacitance deviation of the capacitor bank in Chapter 7 is in accordance with 3Mvar and below, 3Mvar

It has been separately stipulated to be consistent with GB/T 30841-2014;

--- According to the specific situation of China, the capacitor loss tangent (tan delta) in Chapter 8 is limited, and will be in Chapter 8

The contents of the fuse loss are placed in Appendix C;

---The content of the standard insulation level expressed in Tables 3 and 4 of IEC 60871-1 does not conform to China's national conditions, so it is deleted.

Table 3 "Standard insulation levels" is prepared using the values specified in Tables 4 and 5 of GB/T 311.1-2012;

--- According to the allowable value of the capacitance deviation in China, the limit of the maximum allowable current of the capacitor unit in Chapter 20 is modified;

--- Considering that the capacitor bank has different neutral grounding methods, when the capacitor fails and is disconnected from the power supply, the capacitor may

The overvoltage is different, so the current carrying of the discharge circuit should be discharged under the corresponding different overvoltage peaks.

Ability requirement

--- According to China's specific conditions, in the chapter 25 capacitor unit logo added "b) the name of the capacitor unit", "c) capacitor

"Model" and "h" of the unit are measured capacitance, µF"; the name of the "b) capacitor bank is added to the flag of the capacitor bank in Chapter 26.

"" and "c) the model number of the capacitor bank";

--- In order to improve safety and security, in 27.6.1 "Continuous overcurrent" added "should avoid the capacitor being put into the transformer under no-load condition"

The resonant current generated by the group damages the capacitor";

--- According to the allowable value of the capacitance deviation in China, the currents that can be carried by the switches, protection devices and connectors in Chapter 27 are modified.

Large value

--- Because the main content of 27.7.2 is the performance of the circuit breaker, the title of the original IEC heading "circuit breaker without heavy breakdown" was changed to

"Performance of the circuit breaker" and modify the content accordingly;

--- Revised the contents of the air gap in Chapter 27 in accordance with GB/T 311.1-2012;

--- According to the specific situation of China, the contents of Appendix A of IEC 60871-1 have been deleted, "China has stipulated that production and use are prohibited.

Replacement of polychlorinated biphenyl (PCB) dielectrically impregnated capacitors;

--- Increased the test voltage between the AC filter capacitor terminals in Appendix B, in line with GB/T 20994-2007;

--- In order to improve safety and security, at the end of C.3, "the fuse should not be severely broken when it is opened"; at the end of C.5.1

Add "Because the structural parts of the fuse are prone to aging and corrosion, it is necessary to replace the fuses whose parts have been rusted and the tail line has been loosened, so as to avoid

Heavy breakdown due to poor breaking performance, resulting in an expansion accident";

---Complementary to the calculation formula of the resonant frequency in Appendix D, adding the calculation of the capacitor to the series reactor

Because the original surge current calculation formula does not take into account the influence of the power supply, it is only applicable to the case where the capacitor bank is not connected in series with the series reactor.

Modified in accordance with GB 50227-2017;

--- Add a paragraph at the end of E.2. "Capacitors with internal fuses, it is not advisable to use external fuses at the same time";

--- Because the overvoltage test is included in this part as a type test item, the addition of Appendix F (informative appendix) "components and capacitors"

The definition of the shell size".

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., Wuxi Saijing Power Capacitor Co., Ltd., Guilin Electric Power

Container Co., Ltd., Shenzhen Sanhe Power Technology Co., Ltd., Xi'an ABB Power Capacitor Co., Ltd., Shanghai Siyuan Power Capacitor

Co., Ltd., Rixin Electric (Wuxi) Co., Ltd., Shanghai Cooper Power Capacitor Co., Ltd., New Northeast Electric Group Power Capacitor

Company, Wujiang City Suhang Electric Co., Ltd., Anhui Huawei New Energy Co., Ltd., State Grid Zhejiang Electric Power Company Electric Power Research Institute,

Network Zhejiang Electric Power Company Shaoxing Power Supply Company, State Grid Anhui Electric Power Company Electric Power Research Institute, Global Energy Internet Research Institute

Division, Henan Yudian Zhongyuan Power Capacitor Co., Ltd., Herong Electric Co., Ltd., Shanghai Yongjin Electric Group Co., Ltd., Xi'an West

Electric Power Capacitor Co., Ltd., Shaoxing Shangyu Power Capacitor Co., Ltd., Xiamen Farah Electronics Co., Ltd., State Grid Sichuan

Provincial Electric Power Company Electric Power Research Institute, Anhui Source Photoelectric Apparatus Co., Ltd., Wuxi Haorui New Energy Technology Co., Ltd., Zhiyue Group Co., Ltd.

Division, Guangdong Electric Power Grid Co., Ltd. Electric Power Research Institute, Shandong Taikai Power Electronics Co., Ltd.

1 Scope and purpose

This part of GB/T 11024 specifies the performance, test and determination of shunt capacitors for AC power systems with a nominal voltage above 1000V.

Amount, safety requirements, installation and operation guidelines.

This section is applicable to AC power systems with a nominal voltage of 1000V or higher and a frequency of 15Hz~60Hz.

Power unit, capacitor unit and capacitor bank with improved power factor.

This section also applies to capacitors intended for use in power filter circuits. Additional definitions, requirements, and tests for AC filter capacitors

Given in Appendix B.

Additional requirements for capacitors with internal fuse protection and requirements for internal fuses are given in GB/T 11024.4-2019.

The requirements for capacitors with external fuse protection and the requirements for external fuses are given in Appendix C.

This section does not apply to self-healing metallized dielectric capacitors.

This section also does not include the following capacitors.

---Power capacitors for induction heating devices [see GB/T 3984 (all parts)];

---Series capacitors for power systems [see GB/T 6115 (all parts)];

---Motor capacitors and the like [see GB/T 3667 (all parts)];

---Coupling capacitors and capacitor dividers [see GB/T 19749 (all parts)];

---Parallel capacitors for AC power systems with nominal voltages of 1000V and below [see GB/T 12747 (all parts) and

GB/T 17886 (all parts)];

--- Small AC capacitors for fluorescent lamps and discharge lamps (see GB/T 18489 and GB/T 18504);

---Power electronic capacitors (see GB/T 17702);

---Capacitors for microwave ovens (see GB/T 18939.1);

--- Capacitors for suppressing radio interference;

--- A capacitor to be used under a DC voltage superimposed with an AC voltage.

Various accessories, such as insulators, switches, transformers, external fuses, etc., comply with the corresponding standards.

The purpose of this section is as follows.

a) Describe the uniform rules for performance, rating and capacitor unit testing of capacitor units and capacitor banks;

b) elaborate special safety rules;

c) Provide installation and operation guidelines.

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 311 (all parts) Insulation coordination [IEC 60071-1 (all parts)]

GB/T 311.1-2012 Insulation coordination Part 1. Definitions, principles and rules (IEC 60071-1.2006, MOD)

GB/T 1984 high voltage AC circuit breaker (GB/T 1984-2014, IEC 62271-100.2008, MOD)

GB/T 11024.4-2019 Parallel capacitors for alternating current power systems with nominal voltages up to 1000V. Part 4. Internal fuses