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GB/T 3804-2017: High voltage alternating current switches for rated voltage above 3.6 kV and less than 40.5 kV
Status: Valid GB/T 3804: Evolution and historical versions
| Standard ID | Contents [version] | USD | STEP2 | [PDF] delivered in | Standard Title (Description) | Status | PDF |
| GB/T 3804-2017 | English | 1179 |
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High voltage alternating current switches for rated voltage above 3.6 kV and less than 40.5 kV
| Valid |
GB/T 3804-2017
|
| GB 3804-2004 | English | RFQ |
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[GB/T 3804-2004] High-voltage alternating-current switches for rated voltage above 3.6kV and less than 40.5kV
| Obsolete |
GB 3804-2004
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| GB 3804-1990 | English | 799 |
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A. C. high voltage switches for rated voltages from 3kV to 63kV
| Obsolete |
GB 3804-1990
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| GB 3804.1-1990 | English | RFQ |
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A. C. high voltage switches for rated voltages from 3kV to 63kV
| Obsolete |
GB 3804.1-1990
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PDF similar to GB/T 3804-2017
Basic data | Standard ID | GB/T 3804-2017 (GB/T3804-2017) | | Description (Translated English) | High voltage alternating current switches for rated voltage above 3.6 kV and less than 40.5 kV | | Sector / Industry | National Standard (Recommended) | | Classification of Chinese Standard | K43 | | Classification of International Standard | 29.120.60 | | Word Count Estimation | 59,571 | | Date of Issue | 2017-09-29 | | Date of Implementation | 2018-04-01 | | Older Standard (superseded by this standard) | GB/T 3804-2004 | | Quoted Standard | GB/T 311.1-2002; GB/T 762-2002; GB/T 1984-2014; GB/T 1985-2014; GB/T 2900.20-2016; GB/T 4208-2008; GB/T 4585-2004; GB/T 11022-2011; GB/T 16926-2009; GB/T 29489-2013 | | Adopted Standard | IEC 62271-103-2011, MOD | | Regulation (derived from) | National Standard Announcement 2017 No. 23 | | 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 | | Summary | This standard applies to the rated voltage of 3.6 kV ~ 40.5 kV, frequency of 50 Hz, installed in indoor or outdoor and with closing and breaking current rating of the three-pole AC load switch and isolation load switch. This standard also applies to three-phase system with unipolar load switch. This standard also applies to these load switch actuator and its auxiliary equipment. Isolation load switch isolation function should also meet GB/T 1985-20140. This standard does not involve only rely on human energy storage operation of the load switch. The general principles and provisions of this standard also apply to unipolar load switches in single-phase systems. Insulation test and closing and breaking test requirements should meet the requirements of the use of the occasion. This standard specifies the distribution system used in general, special and special purpose load switch | GB/T 3804-2017: High voltage alternating current switches for rated voltage above 3.6 kV and less than 40.5 kV
---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.
High-voltage alternating current switches for rated voltage above 3.6 kV and less than 40.5 kV
ICS 29.120.60
K43
National Standards of People's Republic of China
Replace GB/T 3804-2004
3.6kV~40.5kV high voltage AC load switch
Lessthan40.5kV
(IEC 62271-103.2011, High-voltageswitchgearandcontrolgear-
Part 103. Switchesesratedvoltagesabove1kVuptoand
Including 52kV, MOD)
Released on.2017-09-29
2018-04-01 implementation
General Administration of Quality Supervision, Inspection and Quarantine of the People's Republic of China
China National Standardization Administration issued
Content
Foreword V
1 Overview 1
1.1 Scope 1
1.2 Normative references 1
2 normal and special conditions of use 1
3 Terms and Definitions 1
4 rating 6
4.1 Overview 6
4.2 Rated voltage (Ur) 6
4.3 rated insulation level 6
4.4 Rated frequency (fr) 6
4.5 Rated current and temperature rise 6
4.6 Rated short-time withstand current (Ik) 6
4.7 Rated peak withstand current (Ip) 6
4.8 Rated short circuit duration (tk) 6
4.9 Switching and opening device and rated supply voltage (Ua) of auxiliary and control circuits 6
4.10 Rated power supply frequency of closing and opening device and auxiliary circuit 6
4.11 Pressure rating of compressed air source for controlled pressure system 6
4.12 rated charging level for insulation and/or operation 7
4.101 rated active load breaking current (Iload) 7
4.102 Rated closed-loop breaking current (Iloop and Ipptr) 7
4.103 rated cable charging breaking current (Icc) 7
4.104 Rated Line Charging Breaking Current (Ilc) 7
4.105 Special-purpose load switch rated single capacitor bank breaking current (Isb) 7
4.106 Nominal back-to-back capacitor bank breaking current (Ibb) for special purpose load switches 7
4.107 Rated back-to-back capacitor bank for special purpose load switches. Inrush current (Iin) 7
4.108 Rated Ground Fault Breaking Current (Ief1) 7
4.109 Rated cable charging and line charging breaking current (Ief2) under ground fault conditions 8
4.110 rated motor breaking current (Imot) for special purpose load switches 8
4.111 rated short circuit closing current (Ima) 8
4.112 rated breaking and closing current of universal load switch 8
4.113 Special load switch rating 9
4.114 Special purpose load switch rating 9
4.115 Fuse-protected load switch rating 9
4.116 Types and classifications of general purpose, special purpose and special purpose load switches 9
5 Design and Structure 9
5.1 Requirements for liquids in switchgear and control equipment9
5.2 Requirements for gases in switchgear and control equipment9
5.3 Grounding of switchgear and control equipment 9
5.4 Auxiliary and control equipment 9
5.5 Power operation 9
5.6 Energy storage operation 10
5.7 Operation that does not rely on manpower or power (non-locking operation) 10
5.8 Release Operation 10
5.9 Low pressure and high pressure lockout and monitoring device 10
5.10 Nameplate 10
5.11 Interlocking device 12
5.12 Position indication 12
5.13 Protection rating of the enclosure 12
5.14 Creepage distance 12
5.15 Gas and vacuum seals 12
5.16 Liquid seal 12
5.17 Fire hazard (flammability) 12
5.18 Electromagnetic Compatibility (EMC) 12
5.19 X-ray emission 12
5.20 Corrosion 12
5.101 Closing and breaking operation 12
5.102 Isolation load switch requirements 12
5.103 Mechanical strength 13
5.104 Reliable position 13
5.105 Auxiliary contacts for signals 13
5.106 Breaking of the no-load transformer 13
6 type test 13
6.1 General 13
6.2 Insulation test 14
6.3 Radio interference voltage (riv) test 15
6.4 Measurement of loop resistance 15
6.5 Temperature rise test 15
6.6 Short-time withstand current and peak withstand current test 15
6.7 Inspection of the degree of protection 15
6.8 Sealing test 15
6.9 Electromagnetic Compatibility (EMC) Test 15
6.10 Additional tests for auxiliary and control loops 15
6.11 X-ray test procedure for vacuum interrupters 16
6.101 Closing and breaking test 16
6.102 Mechanical and environmental tests 36
7 Factory test 43
7.1 Overview 43
7.101 Mechanical properties 43
7.102 Mechanical operation test 44
8 Selection guide for load switch 44
8.101 Overview 44
8.102 Conditions affecting use 44
8.103 Insulation fit 44
8.104 Selection of load switch level 45
8.105 Special purpose test 45
9 Information provided with inquiry, tender and order 45
9.1 Information provided with the enquiry and order 45
9.2 Information provided with the tender 46
10 Transportation, storage, installation, operation and maintenance 47
11 Security 47
12 Product impact on the environment 47
Appendix A (Normative) The tolerance of the type test test parameters 48
Appendix B (informative) Technical differences between this standard and IEC 62271-103.2011 and their causes 50
Appendix C (informative) This standard is in accordance with the chapter numbering of IEC 62271-103.2011 52
Figure 1 Three-phase test circuit 22 for active load current opening and closing test (test mode TDload)
Figure 2 Single-phase test circuit 23 for active load current opening and closing test (test mode TDload)
Figure 3 Three-phase test circuit for the closed-loop and parallel-connected transformer current-closing test (test mode TDloop and TDpptr)
Figure 4 Single-phase test circuit 25 for distribution line closed-loop and parallel transformer current opening and closing test (test mode TDloop and TDpptr)
Figure 5 General test circuit for three-phase and single compatibility opening and closing tests 29
Figure 6 Expected TRV parameter limit for capacitor bank current breaking test 31
Figure 7 Three-phase test circuit 32 for ground fault breaking current test (test mode TDef1)
Figure 8 Three-phase test circuit 32 for cable charging breaking current test (test mode TDef2) under ground fault conditions
Figure 9 Three-phase test circuit for short circuit closing current test (test mode TDma) 33
Figure 10 Single-phase test circuit for short-circuit closing current test (test mode TDma) 33
Figure 11 Test sequence for low temperature and high temperature tests 39
Figure 12 Humidity Test 42
Table 1 Preferred values for the rated line and cable charging breaking current of the universal load switch 8
Table 2 Product Information 10
Table 3 Test Method for Universal Load Switch---Test Method for Three-Phase Test of Three-Pole Operation Load Switch
Table 4 Test method of universal load switch---three-pole load switch for pole-by-pole operation of three-phase system and single-pole load switch
Single phase test 17
Table 5 Test method for special purpose load switch---Three-phase test of three-pole operation load switch 18
Table 6 Test methods for special-purpose load switches---three-pole load switches operated on a pole-by-pole basis and unipolar loads in three-phase systems
Single phase test of switches 19
Table 7 TRV parameters of the power supply circuit in the active load current breaking test 24
Table 8 TRV parameters of the closed-loop breaking test of distribution lines 26
Table 9 TRV parameters for parallel current transformer current breaking test 26
Table 10 Parameter requirements for general test circuits for three-phase and single compatibility opening and closing tests 29
Table 11 Limits of expected recovery voltage parameters for capacitor bank current breaking test 30
Table A.1 Type test test parameters tolerances 48
Table B.1 Technical differences between this standard and IEC 62271-103.2011 and their causes 50
Table C.1 Comparison of this standard with the chapter number of IEC 62271-103.2011 52
Foreword
This standard was drafted in accordance with the rules given in GB/T 1.1-2009.
This standard replaces GB/T 3804-2004 "3.6kV ~ 40.5kV high voltage AC load switch".
The main differences between this standard and GB/T 3804-2004 are.
--- The chapter number of the full text has been rearranged, consistent with GB/T 11022-2011;
--- Scope of application, special requirements for opening and closing operations;
--- Added related content in terms and definitions. For example. neutral point effective grounding system, neutral point non-effective grounding system, according to
Capacitive current breaking capacity is divided into C1 level, C2 level load switch, heavy breakdown performance, re-ignition, etc.;
--- Added the term 3.7.119 non-maintaining destructive discharge (NSDD);
---Specifications for the type and classification of general purpose, special purpose and special purpose load switches are given in Chapter 4 Ratings;
--- Revised the contents of the nameplate in Table 2 in Chapter 5, and explained the breaking of the no-load transformer;
--- Removed Chapter 6 of the.2004 version, the content of which is stated in the relevant terms;
--- Chapter 6 adds the relevant requirements for the validity period of the type test, and the special type test for the special requirements of the user has been modified;
--- Increased the mechanical characteristics of the load switch at the beginning of the type test;
--- Clearly specified the relevant requirements of the short circuit closure test;
--- Table 3, Table 4, Table 5, Table 6 in the single capacitor bank current test mode of the test current coefficient is changed to (0.1 ~ 0.4);
--- The amplitude coefficient in Note 2 of Table 9 is changed to 1.8;
--- In the short-circuit closing test mode, the short-circuit closing test should be performed under the active load required by the test mode TDload2
get on;
--- For the test voltage of the capacitive loop, the coefficient of the opening and closing of the capacitor bank with the neutral point ungrounded at the neutral point effective grounding system is changed.
Is 1.4;
--- For the three-phase test of grounding of the neutral point of the power supply, the positive sequence capacitance of the capacitive loop recreating the three-core armored cable is approximately equal to twice
The zero sequence capacitance is modified to be a zero sequence capacitor that should be approximately equal to three times;
--- Chapter 7 adds requirements for mechanical properties;
--- Added Appendix A to determine tolerances.
This standard adopts the redrafting method to modify the use of IEC 62271-103.2011 "High-voltage switchgear and control equipment Part 103. Amount
Load switch with constant voltage above 1kV and 52kV and below.
There are technical differences between this standard and IEC 62271-103.2011. The terms involved in these differences have been passed on the outer side of the page.
The vertical single line (|) of the white position is identified, and the corresponding technical differences and their causes are given in Appendix B.
This standard applies to IEC 62271-103.2011 "High-voltage switchgear and control equipment Part 103. rated voltage above 1kV,
The entire chapter number of the load switch of 52kV and below has been edited. The standard and IEC 62271-103 are given in Appendix C.
2011 chapter number comparison.
This standard shall be used together with GB/T 11022-2011. Unless otherwise specified in this standard, this standard shall be implemented in GB/T 11022-2011.
Provisions. In order to simplify the repeated expression of the same requirements, the chapters and articles of this standard are the same as GB/T 11022-2011. For these chapters,
Supplements to the content of the article are given under the same reference heading, and additional terms are numbered starting from 101.
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 standard was proposed by the China Electrical Equipment Industry Association.
This standard is under the jurisdiction of the National High Voltage Switchgear Standardization Technical Committee (SAC/TC65).
This standard was drafted. Xi'an High Voltage Electric Apparatus Research Institute Co., Ltd., Guangdong Power Grid Corporation, Huayi Electric Co., Ltd., China
Electric Power Research Institute, State Grid Electric Power Research Institute, Xidian Baoji Electric Co., Ltd., Machinery Industry High-voltage Electrical Equipment Quality Inspection
Center, Shanghai Tianling Switch Factory Co., Ltd., Shanghai Electric Transmission and Distribution Test Center Co., Ltd., Pinggao Group Co., Ltd., Xi'an Xidian Switch
Electric Co., Ltd., Beijing Cree Distribution Automation Co., Ltd., Cooper (Ningbo) Electric Co., Ltd., ABB (China) Co., Ltd.
Shanghai Siemens Switch Co., Ltd., Schneider Electric (China) Co., Ltd., Siemens Medium Voltage Switch Technology (Wuxi) Co., Ltd., Beijing North
Kai Electric Co., Ltd., Zhejiang Shitong Electric Manufacturing Co., Ltd., Wuhan Wuchang Electric Control Equipment Co., Ltd., Ningbo Tianan (Group) Co., Ltd.
Co., Ltd., Jinzhou Jinkai Electric Group Co., Ltd., Shenzhen Guanghui Electric Industrial Co., Ltd., Yihe Electric Group Co., Ltd.
Company, Henan Senyuan Electric Co., Ltd., Zhejiang Switch Factory Co., Ltd., Zhengtai Electric Co., Ltd., Chengdu Xuguang Electronics Co., Ltd.
Limited Company, Xidian Baoguang Baoji Co., Ltd., Risheng Group Co., Ltd., Jiangsu Huaguan Electric Group Co., Ltd., Fujian Zhongneng Electric Stock Co., Ltd.
Co., Ltd., Yangzhou New Concept Electric Co., Ltd., Ningbo Yaohua Electric Technology Co., Ltd., Qingdao Te Rui De Electric Co., Ltd.
Division, Xidian Mitsubishi Electric Switch Equipment Co., Ltd.
The main drafters of this standard. Tian Enwen, Li Duanqi, Zhu Cunchun, Wu Hongyan, Zhang Shi.
Participated in the drafting of this standard. Fan Chufu, Fan Guangwei, Fu Lujun, Chen Jianguang, Chen Yu, Tang Zhenpeng, Lei Yiyong, Hou Yinshun, Wu Hongbo,
Kong Xiangjun, Cheng Junqi, Li Yuchun, Zhang Chongle, Yan Zhengli, Yang Yingjie, Tan Yan, Luo Shicong, Qiu Weifeng, Qi Guanxing, Wang Xiangke, Xu Wei, Wang Taoxin,
Hu Zhaoming, Liu Chengxue, Xie Jianbo, Fu Minghai, Wang Junzhuang, Lei Xiaoqiang, Xue Zhong, Qiao Zhong, Yin Hongyan, Ye Shuxin, Lu Deyin, Shen Xiangyu, Wang Fumin,
Lin Fuming, Zhu Peilong, Wang Dongmei, Kong Xiangchong, Liu Yang, Lu Zhenmei, Shu Guobiao, Tian Zhiqiang, Dang Xiangdong, Fan Jianrong, Jin Taihong, Liu Junfeng,
Wang Tongzhi, Liu Jiangang, Lu Enlin, Qu Dongming, Wang Keye, Liu Feng, Zhang Xuemin, and Wen Wenqu.
The previous versions of the standards replaced by this standard are.
---GB/T 3804-2004, GB 3804-1990, GB 3804-1983.
3.6kV~40.5kV high voltage AC load switch
1 Overview
1.1 Scope
This standard applies to the rated voltage of 3.6kV~40.5kV, the frequency is 50Hz, installed indoors or outdoors and has the function of closing and breaking.
Flow rating of three-pole AC load switch and isolated load switch. This standard also applies to single-pole load switches for three-phase systems.
This standard also applies to the operating mechanism of these load switches and their auxiliary equipment.
The isolation function of the isolated load switch should also meet GB/T 1985-2014.
This standard does not cover load switches that rely solely on human energy storage.
The general principles and provisions of this standard also apply to unipolar load switches in single-phase systems. Insulation test and closing and breaking test
The requirements shall meet the requirements for the intended use.
This standard specifies the requirements for general purpose, special purpose and special purpose load switches used in power distribution systems.
Assume that the opening and closing operations are performed according to the manufacturer's instructions, and a closing operation can be performed immediately after the breaking operation, but the closing is performed.
The breaking operation cannot be performed immediately after the operation because the breaking current may exceed the rated breaking current of the load switch.
Note 1. In addition to requiring a special distinction, the term “load switch” represents all types of load switches and isolated load switches within the scope of this standard.
Note 2. The grounding switch is not included in the scope of this standard. The earthing switch, which is part of the load switch, is included in GB/T 1985-2014.
Note 3. This standard does not apply to switchgear with load switch as accessory for high-voltage fuse complete device or its base, nor for complete set of fuses.
Switching device for opening and closing operation of the device.
1.2 Normative references
The following documents are indispensable for the application of this document. For dated references, only dated versions apply to this article.
Pieces. For undated references, the latest edition (including all amendments) applies to this document.
GB/T 311.1-2012 Insulation coordination Part 1. Definitions, principles and specifications (IEC 60071-1.2006, IEC 60071-1
Am1.2010, MOD)
GB/T 762-2002 standard current rating (eqvIEC 60059.1999)
GB/T 1984-2014 High voltage AC circuit breaker (IEC 62271-100.2008, MOD)
GB/T 1985-2014 High voltage AC disconnector and earthing switch (IEC 62271-102.2001 A1.2011, MOD)
GB/T 2900.20-2016 Electrotechnical terminology high voltage switchgear (IEC 60050 (441). 1984, MOD)
GB/T 4208-2008 Shell protection class (IP code) (IEC 60529.2001, IDT)
GB/T 4585-2004 Artificial contamination test for high voltage insulators for AC systems (IEC 60507.1991, IDT)
GB/T 11022-2011 Common technical requirements for high-voltage switchgear and controlgear standards (IEC 62271-1.2007, MOD)
GB/T 16926-2009 High-voltage AC load switch-fuse combination electric appliance (IEC 62271-105.2002, MOD)
GB/T 29489-2013 Inductive load opening and closing of high voltage switchgear and control equipment (IEC 62271-110.2009, MOD)
2 normal and special conditions of use
Chapter 2 of GB/T 11022-2011 is applicable.
3 Terms and definitions
The following terms and definitions as defined in GB/T 2900.20-2016 and GB/T 11022-2011 apply to this document.
Note 1. For ease of use and ease of understanding of this standard, some of the following terms and definitions have been restated and rewritten.
Note 2. The following terms and definitions are classified according to GB/T 2900.20-2016. Additional terms and definitions of classification and GB/T 2900.20-2016
The classification method used is the same.
3.1 General terms
3.1 of GB/T 11022-2011 is applicable and supplemented as follows.
3.1.101
Neutral point effective grounding system effectivelylyearthedneutralsystem
The system is grounded with a sufficiently low impedance that the ratio of zero-sequence reactance to positive-sequence reactance (X0/X1) is positive under all system conditions and
Less than 3, the ratio of the zero sequence resistance to the positive sequence reactance (R0/X1) is positive and less than 1. Usually this system is a (neutral) direct grounding system
Or (neutral) low impedance grounding system.
Note. The correct evaluation of the grounding conditions must consider not only the physical grounding conditions around the location but also the entire system.
3.1.102
Neutral point non-effective grounding system non-effectivelyearthedneutralsystem
In addition to meeting the grounding system other than the neutral point effective grounding system given in 3.1.101. Usually this system is a neutral point insulation system,
(Neutral) High impedance grounded system or (neutral) resonant grounding system.
Note. The correct evaluation of the grounding conditions must consider not only the physical grounding conditions around the location but also the entire system.
3.2 Assembly of switchgear and control equipment
3.2 of GB/T 11022-2011 is applicable.
3.3 Components of the final assembly
3.3 of GB/T 11022-2011 is applicable.
3.4 Switching device
3.4 of GB/T 11022-2011 is applicable and supplemented as follows.
3.4.101
Load switch
Capable of closing, carrying and breaking current under normal loop conditions (which may include specified overload operating conditions), as well as in specified anomalies
A switching device that carries current for a specified period of time under a loop condition (such as a short circuit condition).
3.4.102
Isolation load switch disconnectingswitch
The load switch that meets the requirements of the isolating switch at the opening position.
3.4.103
Universal load switch generalpurposeswitch
In the power distribution system, it is able to close and break all currents that normally occur until its rated breaking current, as well as short load and close
Line current load switch.
3.4.103.1
E1 load switch classE1generalpurposeswitch
A universal load switch capable of breaking the load current and the basic electrical life of the short circuit.
Note. This level is suitable for load switches that perform infrequent opening and closing operations or allow proper inspection and replacement of the opening and closing parts.
3.4.103.2
E2 load switch classE2generalpurposeswitch
A universal load switch capable of interrupting load current and short-circuiting medium electrical life.
Note. This level is suitable for infrequent opening and closing operations, and does not allow or can not check and replace the load switch of the opening and closing parts.
3.4.103.3
E3 class load switch classE3generalpurposeswitch
A universal load switch capable of interrupting load current and short-circuiting high electrical life.
Note. This level is suitable for the frequent opening and closing operation, and does not allow or can not check and replace the load switch of the opening and closing parts.
3.4.103.4
M1 load switch classM1switch
Load switch with 1000 operating mechanical life.
3.4.103.5
M2 class load switch classM2switch
Special use case with 5000 extended mechanical life and frequently operated load switch.
3.4.103.6
C1 load switch classC1switch
Validated by specific type tests (test methods Icc, Ilc, Isb, and Ibb) with low weight breakdown during capacitive current breaking
Probability load switch.
3.4.103.7
C2 load switch classC2switch
Validated by specific type tests (test methods Icc, Ilc, Isb, and Ibb) with very low weight during capacitive current breaking
Break switch with probability of breakdown.
3.4.104
Dedicated load switch limitedpurposeswitch
Load with rated current, rated short-time withstand current, and one or more but not all of the universal load switches
switch.
3.4.105
Special purpose load switch specialpurposeswitch
Universal load switch or special load switch for one or more of the following applications.
--- Opening and closing a single capacitor bank;
---Open and close the back-to-back capacitor bank;
---Opening the motor under steady state and locked conditions;
--- Opening and closing closed loop circuit consisting of parallel large-capacity power transformers.
3.4.105.1
Single capacitor bank load switch singlecapacitorbankswitch
Special purpose load switch for opening and closing charging current, the charging current value of opening and closing is up to its rated single capacitor group breaking
Current.
3.4.105.2
Back-to-back capacitor bank load switch back-to-backcapacitorbankswitch
The power supply for the breaking load switch is connected to one or more capacitor banks, and the charging current is until its rated back-to-back capacitor bank is turned on.
Special purpose load switch for interrupted current capacitor banks. The load switch should be able to close until its rated capacitor bank is connected to the inrush current
Inrush.
3.4.105.3
Motor load switch motorswitch
Special purpose load switch for opening and closing motors in steady state and stall conditions.
3.4.105.4
Parallel power transformer closed-loop load switch paralelpowertransformerclosed-loopswitch
A special purpose load switch for opening and closing a closed loop formed by a parallel large-capacity power transformer.
Note. This type of load switch is typically used as a medium voltage contact load switch for the secondary side of the transformer, so the breaking current is high and the transient recovery voltage (TRV)
The conditions are harsh.
3.5 Switching equipment and components of control equipment
Applicable to 3.5 of GB/T 11022-2011.
3.6 Operation
3.6 of GB/T 11022-2011 is applicable.
3.7 Characteristic parameters
3.7 of GB/T 11022-2011 is applicable and supplemented as follows.
3.7.101
Breaking capacity breakingcapacity
The expected current value at which the switching device or fuse can be turned off under specified operating and operating conditions and a specified voltage.
Note 1. The specified voltage and specified conditions are covered in the relevant standards.
Note 2. For the switching device, the breaking capacity can be defined according to the type of current included in the specified conditions, such as. line charging breaking capacity, cable charging
Electrical breaking capacity, breaking capacity of a...
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