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DL/T 640-2019 English PDF

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DL/T 640-2019: (High voltage AC drop fuse)
Status: Valid

DL/T 640: Evolution and historical versions

Standard IDContents [version]USDSTEP2[PDF] delivered inStandard Title (Description)StatusPDF
DL/T 640-2019English999 Add to Cart 6 days [Need to translate] (High voltage AC drop fuse) Valid DL/T 640-2019
DL/T 640-1997English919 Add to Cart 5 days [Need to translate] Technical condition for order of the ourdoor a.c high-voltage drop-out fuse and the fuse-link Obsolete DL/T 640-1997

PDF similar to DL/T 640-2019


Standard similar to DL/T 640-2019

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Basic data

Standard ID DL/T 640-2019 (DL/T640-2019)
Description (Translated English) (High voltage AC drop fuse)
Sector / Industry Electricity & Power Industry Standard (Recommended)
Classification of Chinese Standard K45
Word Count Estimation 40,431
Date of Issue 2019-06-04
Date of Implementation 2019-10-01
Older Standard (superseded by this standard) DL/T 640-1997
Regulation (derived from) Natural Resources Department Announcement No. 7 of 2019
Issuing agency(ies) National Energy Administration

DL/T 640-2019: (High voltage AC drop fuse)

---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 drop-out fuses DL/T 996-2019 ICS 29.120.40 K 45 People's Republic of China Electric Power Industry Standard Replace DL/T 640-1997 High voltage AC drop-out fuse 2019-06-04 released 2019-10-01 implementation Issued by National Energy Administration

Table of contents

Foreword...Ⅲ 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 Ratings...6 4.1 Overview...6 4.2 Rated voltage (rU)...6 4.3 Rated insulation level...6 4.4 Rated frequency) (rf...6 4.5 Rated current and temperature rise...7 4.6 Rated short-circuit breaking current...7 4.7 Rated switching load current (when applicable)...7 5 Design and structure...7 5.1 Structure and components...7 5.2 Wiring terminals...7 5.3 Insulator...7 5.4 Interchangeability...7 5.5 Mechanical requirements...7 5.6 Creepage distance...8 5.7 Corrosion...9 5.8 Pre-arc time-current characteristics...9 5.9 Temperature and temperature rise...9 5.10 Breaking capacity...9 5.11 Load switching capacity...9 5.12 Logo...9 6 Type test...10 6.1 General...10 6.2 Insulation test...12 6.3 Temperature rise test...12 6.4 Mechanical test...12 6.5 Main circuit resistance measurement...12 6.6 Breaking test...13 6.7 Switching load current test (for load fuse)...18 6.8 Time-current characteristic test...19 6.9 Manual pollution test (when applicable)...20 6.10 Opening and closing no-load circuit and no-load transformer test (when applicable)...20 7.Factory test...21 7.1 Overview...21 7.2 Appearance and size inspection...21 7.3 Power frequency dry withstand voltage test...21 7.4 Checking contact performance...21 7.5 Static tensile test of fuse...21 7.6 Drop test of fuse carrier...21 7.7 Time-current characteristic test...21 8.Selection guidelines...22 8.1 Overview...22 8.2 Selection of ratings...22 9.Information provided during inquiry, bidding and ordering...23 9.1 Overview...23 9.2 Inquiry and order information...23 9.3 Information about the tender...23 10.Transportation, storage, installation, operation and maintenance rules...24 10.1 Overview...24 10.2 Conditions during transportation, storage and installation...24 10.3 Installation...24 10.4 Operation...25 10.5 Repair...25 11.Safety...25 12.The impact of the product on the environment...25 Appendix A (informative appendix) guidelines for use...32 Appendix B (informative appendix) fuse relief cap size and static relief pressure value...35 Appendix C (informative appendix) Pre-arc time-current characteristics of K and T fuse-links...37 Appendix D (informative appendix) information and technical requirements provided in inquiry forms, bids and orders...38 Appendix E (informative appendix) Reasons for selection of breaking test values...40 Appendix F (informative appendix) operating lever of fuse...42

Foreword

This standard is based on the content of IEC 60282-2.2008 "High-Voltage Fuses Part 2 Jet Fuses" to DL/T 640-1997 "Household "External AC high-voltage drop-out fuses and fuse parts ordering technical conditions" were comprehensively revised. But in some content, according to the power system of our country The actual use requirements have been modified and supplemented. The main differences between this standard and IEC 60282-2.2008. --The minimum ambient temperature for normal use environmental conditions, according to my country's regional conditions, in accordance with my country's power industry standards. --According to the actual rated insulation level of the domestic power system, in accordance with my country's power industry standards. --The rated voltage is based on the actual domestic voltage level, which is specified in this standard as 3.6kV~72.5kV. --The name of the standard has been changed from "High Voltage Fuse Part 2.Jet Fuse" to "High Voltage AC Drop Fuse". --Added related terms, such as rated breaking current, minimum breaking current, rated switching load current, transfer current, isolation fracture, Electric clearance, main contact, pressure relief cap, arc extinguishing tube, auxiliary arc extinguishing tube, etc. - Supplement the load current and related requirements of the load fuse opening and closing. - Added Chapter 8, Chapter 9, Chapter 10, Chapter 11 and Chapter 12 and related content. -Supplements Appendix A, Appendix B, Appendix C, Appendix D and related content. The main differences between this standard and DL/T 640-1997. --The name of the standard has been changed from "Technical Conditions for Ordering Outdoor AC High Voltage Drop-out Fuses and Fuse Parts" to "High Voltage AC Dropout Falling fuse". --Edit format change, the chapter number of this standard is consistent with DL/T 593-2016, a total of 12 chapters (the original standard has 8 chapters). This standard is cancelled The original standard has a large number of suspended paragraphs, and titles are added after the clause number. --Scope. Delete "This standard can be used as the basis for the selection and acceptance of fuses for manufacturing, technical supervision and use departments." - Normative references. delete GB 763, GB 3309 and other standards, GB 3804 and other changes in the year number, supplement related standards. --Chapter 3 Terms and Definitions. The following terms and definitions have been added. a) 3.1 Electrical characteristics, add 3 terms. rated value, rated parameter, expected transient recovery voltage (loop); b) 3.2 Fuse and its components, add 4 terms. fuse, fuse support, replaceable fuse, reinstallation unit; c) 3.3 Additional terms, add 2 terms. fuse rate identification and fuse interchangeability. --Chapter 5 Design and Structure. a) Removed all suspended paragraphs and added clause titles. For example, 5.1 structure and components, 5.2 wiring terminals, 5.3 insulators, 5.4 Interchangeability, 5.5 Mechanical requirements, 5.6 Creepage distance, 5.7 Corrosion, 5.8 Pre-arc time-current characteristics, 5.9 Temperature and temperature rise, 5.10 opening and closing capacity; b) The fuse structure diagram is supplemented with the fuse structure diagram without switching load current device; c) The matched insulators supplement the composite insulators and related requirements; d) Added interchangeability and related requirements; e) Added creepage distance and related requirements; f) Corrosion and related requirements have been supplemented; g) Supplement the relevant requirements of the maximum allowable temperature and allowable temperature rise of the parts, materials and media of the fuse except the melt; h) Added load current and related requirements for switching load fuse. --Chapter 6 Type Test. a) Change "normally produced products should be type tested every 3 to 5 years" It means "normally produced products shall undergo a type test every 8 years"; b) Supplement the relevant requirements of the type test report; c) Supplement the common test requirements for all type tests; d) The appearance and size inspection and contact performance inspection in the type test items are deleted; e) Supplements related requirements for test samples and equipment layout in the breaking test, and adds equipment layout drawings; f) The calibration and test method of the test circuit in the breaking test are supplemented; g) Supplements the relevant requirements for the breaking test of the fuse series of the same family; h) Revised the method for determining the breaking current in the breaking test oscilloscope, and added the test oscilloscope for test mode 5 breaking current; i) Revised the power factor value in the breaking test method 4, and added the power factor for the 24kV voltage level; j) Revised the amplitude coefficient in the breaking test and supplemented the test parameters for the 24kV voltage level; k) The characteristic parameters and TRV parameters of the switching load current test circuit are supplemented. --Chapter 7 Factory Test. This chapter is newly added. --Chapter 8 Selection Guidelines. This chapter is newly added. --Chapter 9 Information provided during inquiry, bidding and ordering. This chapter is new. --Chapter 10 Rules for Transportation, Storage, Installation, Operation and Maintenance. This chapter is new. --Chapter 11 Security. This chapter is new. --Chapter 12 The impact of products on the environment. This chapter is new. --Appendix A (informative appendix) guidelines for use. revised the sub appendix to select the rated current of the fuse and the selection of the fuse class The content is moved to Chapter 8 Selection Guidelines. --Appendix D (informative appendix) Information and related content provided in inquiry forms, bids and orders. This appendix is new. --Appendix E (informative appendix) Reasons for selection of breaking test values and related content requirements. This appendix is new. --Appendix F (informative appendix) operating lever and related content of fuse. This appendix is new. Appendices A, B, C, D, E, and F of this standard are all informative appendices. This standard should be used together with DL/T 593-2016, and the chapter number of this standard is consistent with DL/T 593-2016.Where DL/T is stated in the standard If the terms of 593-2016 apply, the terms apply to this standard. If it is not stated that it is applicable, this clause does not apply to this standard. After the implementation of this standard, it will replace DL/T 640-1997. This standard was proposed by the China Electricity Council. This standard is under the jurisdiction and interpretation of the High Voltage Switchgear and DC Power Supply Standardization Technical Committee (DL/T C 06) of the power industry. The main drafting unit of this standard. China Electric Power Research Institute Co., Ltd. Participated in the drafting of this standard. Shanghai Electric Power Transmission and Distribution Test Center Co., Ltd., power industry power equipment and instrument quality inspection and testing Heart, Machinery Industry High Voltage Electrical Equipment Quality Inspection Center, Xi’an High Voltage Electrical Apparatus Research Institute Co., Ltd., State Grid Henan Electric Power Company Electric Power Science Research Institute, State Grid Hebei Electric Power Research Institute, State Grid Shandong Electric Power Research Institute, State Grid Ningxia Electric Power Company Electric Power Research Institute, State Grid Jiangsu Electric Power Company Electric Power Research Institute, State Grid Shandong Electric Power Company Zibo Power Supply Company, China Southern Power Grid Division Research Institute Co., Ltd., Suzhou Electrical Research Institute Co., Ltd., Risheng Group Co., Ltd., Jiangsu Province, such as high-voltage electrical equipment Co., Ltd., Shandong Taikai Intelligent Power Distribution Co., Ltd., Siemens Medium Voltage Switch Technology (Wuxi) Co., Ltd. The main drafters of this standard. Zhang Zhenqian, Kong Xiangjun, Wang Chengyu, Qiu Weifeng. Participating drafters of this standard. Li Xiangyang, Yang Yingjie, Wang Haoqing, Wang Ting, Huang Xingquan, Li Yuchun, Yang Haifang, Pang Xianhai, Li Xiuwei, Ma Li, Li Xiuguang, Yang Jinggang, Sun Xuefeng, Li Hao, Wu Hongyan, Gu Lili, Wang Chengquan, Ren Xiaodong, Han Tao, Li Rui. The previous releases of this standard are as follows. The opinions or suggestions during the implementation of this standard will be fed back to the Standardization Center of China Electricity Council (No. 2 Baiguang Road, Xicheng District, Beijing) One, 100761). High voltage AC drop-out fuse

1 Overview

1.1 Scope This standard specifies the environmental conditions, terminology, rated parameters, design, and design of high-voltage AC drop-out fuses (hereinafter referred to as fuses) Contents and requirements of structure, type test, factory test, marking, packaging, transportation, selection guide, etc. This standard applies to fuses with a rated voltage of 3.6kV~72.5kV and a rated frequency of 50Hz, which are used in power systems and outdoor transformers. Protection of equipment such as compressors. According to the different transient recovery voltage of the fuse use place, it is divided into Class A and Class B. Note 1.For fuses used to protect capacitors, follow relevant standards. Note 2.This standard does not involve the ability to close faults. Note 3.This standard does not involve issues related to noise levels, nor does it involve the emission of hot gas during fuse breaking failure. Note 4.This standard also includes relevant technical requirements for fuses, which can be implemented by reference. 1.2 Normative references The following documents are indispensable for the application of this document. For dated reference documents, only the dated version applies to this article Pieces. For undated references, the latest version (including all amendments) applies to this document. GB/T 772-2005 Technical requirements for ceramic parts of high voltage insulators GB/T 3804-2017 3.6 kV～40.5 kV high voltage AC load switch GB/T 5273-2016 Standardization of terminal size for high voltage electrical appliances GB/T 5465.2-2008 Graphical symbols for use in electrical equipment Part 2.Graphical symbols GB 15166.1-201× Electrical terminology high-voltage AC fuse (IEV 60050 (441). 1984 A1..2000, MOD) GB/T 19519-2014 Composite insulators for AC overhead lines with a nominal voltage higher than 1000V-definition, test methods and acceptance Guidelines DL/T 593-2016 Common technical requirements for high-voltage switchgear and control equipment standards

2 Normal and special conditions of use

According to Chapter 2 of DL/T 593-2016. If the conditions of use exceed those specified in Chapter 2, the manufacturer shall negotiate with the user.

3 Terms and definitions

3.1 Electrical characteristics 3.1.1 rated value It is usually the value specified by the manufacturer for the component, device or equipment under specified working conditions. [GB 15166.1-201×2.35] 3.1.2 Rating A set of ratings and operating conditions. [GB 15166.1-201×2.36] 3.1.3 Prospective current The fuse replaces the current (effective value) flowing in the loop with a conductor with negligible impedance. 3.1.4 Prospective peak current The peak value of the first half wave of the expected current during the transient after the current appears. Note. This definition assumes that an ideal switching device is used to switch on the current, that is, the impedance changes from infinity to zero. It depends on the phase of the instantaneous voltage of the current. [3.7.103 of DL/T 402-2016] 3.1.5 Prospective breaking current Corresponding to the expected current measured at the moment of arcing during the breaking process. 3.1.6 breaking capacity The expected current value that the fuse can break under the specified use conditions, performance conditions and specified voltage. 3.1.7 pre-arcing time (melting time) pre-arcing time The time interval from the application of a certain current value sufficient to melt the fuse to the moment when the arc appears. [GB 15166.1-201×2.21] 3.1.8 arcing time The time interval from the moment the fuse starts to arc to the moment the arc finally extinguishes. 3.1.9 Breaking time (action time) total clearing time The sum of pre-arc time and arcing time. [GB 15166.1-201×2.22] 3.1.10 Joule integral 3.1.11 virtual time The Joule integral value is divided by the square of the expected current. Note. Usually the effective time value specified for the fuse is the value of the pre-arc time or the breaking time. [GB 15166.1-201×2.37] 3.1.12 time-current characteristic Under specified conditions, it represents the function curve of time (pre-arc time or breaking time) and expected current. 3.1.13 recovery voltage After the current is broken, the voltage that appears between the two terminals of the fuse. This voltage is the transient recovery voltage at first, followed by the power frequency recovery voltage. 3.1.14 transient recovery voltage (abbreviation TRV) The recovery voltage within the time with significant transient characteristics depends on the characteristics of the circuit and the fuse. 3.1.15 power frequency recovery voltage The recovery voltage after the transient voltage phenomenon disappears. 3.1.16 Prospective transient recovery voltage (loop) The transient recovery voltage that appears after breaking the expected symmetrical current with an ideal switching device. Note. This definition assumes that the ideal switching device is used to replace the switching device or fuse used to determine the expected transient recovery voltage, that is, the instantaneous impedance changes from zero at the current zero point Instantly convert to infinity. For circuits in which current flows through several different paths, such as multiple circuits, this definition assumes that ideal switching devices are used to break in the pole under consideration Current. 3.1.17 rated breaking current The maximum value (effective value) that the fuse can break the expected current under the specified use conditions, performance conditions and specified voltage. 3.1.18 minimum breaking current minimum breaking current The lower limit of the expected breaking current determined by the fuse under the specified use conditions, performance conditions and under the specified voltage. [GB 15166.1-201×2.29] 3.1.19 rated switching load current rated switching load current Under the specified conditions, the load fuse has the rated current of the fuse base with the switching power factor of 0.7~0.8 (lagging), overload Current and load current below it. 3.2 Fuse and its components 3.2.1 fuse When the current exceeds a given value for sufficient time, by melting one or several specially designed and proportional components, the current is interrupted to disconnect The device connected to the loop. The fuse includes all the components that constitute a complete device. [2.1 of GB 15166.1-201×] 3.2.2 Expulsion fuse A fuse that extinguishes the arc by jetting gas from the arc energy. [GB 15166.1-201×2.11] 3.2.3 drop-out fuse After the fuse is activated, the fuse-carrying piece will fall automatically to form a fuse that isolates the fracture. Note. Drop-out fuse is a kind of jet fuse. [GB 15166.1-201×2.7] 3.2.4 Load-fuse Drop-out fuse with switching load current performance. 3.2.5 Terminal The conductive part of the fuse is used to connect to an external circuit. 3.2.6 fuse-base Fixing parts of fuse equipped with contacts and terminals, including necessary insulating parts. [GB 15166.1-201×2.2] 3.2.7 fuse-base contact The conductive part of the fuse base that is in contact with the fuse carrier contact. [2.3 of GB 15166.1-201×] 3.2.8 fuse-carrier Movable parts of the fuse used to load the fuse, excluding the fuse. [GB 15166.1-201×2.13] 3.2.9 fuse-carrier contact The conductive part of the fuse carrier that is in contact with the fuse base contact. [GB 15166.1-201×2.5] 3.2.10 fuse-holder The combination of fuse base and fuse carrier. [GB 15166.1-201×2.14] 3.2.11 fuse-link The fuse parts including the melt to be replaced after the fuse is activated. Note. The fuse is composed of buttons, leads, crimping tubes, melts, auxiliary arc extinguishing tubes and other components, see Figure 2. [GB 15166.1-201×2.9] 3.2.12 fuse-link contact The contact piece of the fuse that engages with the relevant parts of the fuse. [GB 15166.1-201×2.4] 3.2.13 Melt fuse-element When the current exceeds a certain value, the part of the fuse that is fused within a predetermined time, that is, the part of the fuse that is melted when the fuse is activated. [GB 15166.1-201×2.8] 3.2.14 replaceable fuse-link After the action, you can reinstall the unit to restore the operating fuse. [GB 15166.1-201×2.16] 3.2.15 refill unit After the action, a group of replaceable parts that restore the fuse to the initial state. [GB 15166.1-201×2.15] 3.2.16 main contact The closing position carries the contact of the main circuit current. 3.2.17 Expendable cap The replaceable part of the upper end of the arc extinguishing tube of the closed fuse-carrying part of the fuse. It has a pressure sensitive area. During the fuse breaking process, the arc extinguishing tube If the internal pressure exceeds a predetermined value, the pressure is released. 3.2.18 arc-extinguishing tube Tubular parts used to extinguish the arc when the arc generates gas. 3.2.19 auxiliary arc-extinguishing tube A tube-shaped part set on the fuse melt to extinguish a small current arc. 3.3 Additional terms 3.3.1 Homogeneous series (of fuse-links) A series of fuses that deviate from each other only in terms of characteristics. For a given test, a certain number of such series or a reduced number The test of specific fuses can be used as a representative of all fuses in the same family series. The characteristics of the fuse meet the following conditions and are considered to constitute the same family series. a) The rated voltage, breaking capacity and frequency should be the same; b) Except for the melt, all materials should be the same; c) Except for the cross-sectional area and number of melts, all dimensions should be the same; d) The diameter of the melt should change in the same law along its length, and the change of the diameter should be monotonous with respect to the rated current of the fuse. The size of the fuse parts of the same family, the powerful wire drawing in parallel with the melt and the auxiliary arc extinguishing tube set in the melt are not counted. [GB 15166.1-201×2.34] 3.3.2 isolating distance The electric gap formed between the contacts of the fuse in the dropped position. Note. There is isolation switch insulation between the contacts. 3.3.3 Classification of a fuse For a given rated parameter, according to the performance of the fuse that meets the TRV requirements in the following table when tested in test methods 1, 2, 3 and 4 They are classified into 2 levels (see 8.2.3 for selection guidelines). 3.3.4 Speed designation of fuse-links The mark related to the ratio of the current corresponding to the two prescribed pre-arc times is represented by the letter K or T. Note 1.K or T are typical letters used for rate identification. Note 2.The pre-arc time is usually specified as 0.1 s and 300 s (or 600 s). Note 3.The fuse is usually indicated by the rated current and the following speed identification. For example, a 125 K fuse has a rated current of 125 A and a speed identification of K Type fuse. 3.3.5 Speed ratios for melting time-current characteristics In the pre-arc time-current characteristics, the ratio of the melting current of 0.1s to the melting current of approximately 300s (or 600s). ratio 6～8 It is a K-type (fast) fuse; the ratio of 10 to 13 is a T-type (slow) fuse. Note. The rated current of the fuse is greater than 100A and less than.200A is 600s. 3.3.6 Interchangeability of fuse-links The compatibility of fuses produced by different manufacturers in terms of size and pre-arc time-current characteristics should enable these fuses to be used There is no significant change in the pre-arc time-current characteristics of the fuse-carrying parts from other manufacturers. Note. It should be noted that the protective performance of the assembly composed of the selected fuse link and the selected fuse carrier can only be used in the performance test performed on this specific assembly. To confirm.

4 Rating

4.1 Overview The ratings of high-voltage AC drop-out fuses are as follows. a) Rated voltage (rU); b) Rated insulation level; c) Rated frequency (rf); d) Rated current (rI), including the rated current of the fuse base and the rated current of the fuse; e) Rated short-circuit breaking current (Isc); f) Rated switching load current (when applicable). 4.2 Rated voltage (rU) 3.6, 7.2, 12, 24, 40.5, 72.5kV. 4.3 Rated insulation level In Table 1 of 4.3 of DL/T 593-2016, the rated insulation level of 72.5kV and below is applicable. 4.4 Rated frequency) (rf 50Hz. 4.5 Rated current (Ir) 4.5.1 Rated current of fuse base 50, 100,.200A. 4.5.2 Fuse rated current 6.3, 8, 10, 12.5, 16, 20, 25, 31.5, 40, 50, 63, 80, 100, 125, 160,.200A. 4.5.3 Fuse rated current The rated current of the fuse should be equal to the rated current of the fuse installed in it, and its value should not be greater than the rated current of the fuse base. See 4.5.2. 4.6 Rated short-circuit breaking current (Isc) The rated short-circuit breaking current is selected from the following values. 1.6, 2.0, 3.15, 4.0, 6.3, 8, 10, 12.5, 16, 20kA. 4.7 Rated switching load current (when applicable) The rated load switching current is the rated c...

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