Standard No.:	NB/T 42059-2015
English Name:	Disconnectors of metal-oxide surge arresters for a.c. systems
Chinese Name:	交流电力系统金属氧化物避雷器用脱离器
Chinese Classification:	K49    Lightning arrester
Professional Classification:	NB    Professional Standard - Energy
ICS Classification:	29.080.99 29.080.99    Other standards related to insulation 29.080.99
Issued by:	China Energy Aminidstration
Issued on:	2015-10-27
Implemented on:	2016-3-1
Status:	valid
Language:	English
File Format:	PDF
Word Count:	11500 words
Price(USD):	444.0
Delivery:	via email in 1 business day

Disconnectors of metal-oxide surge arresters for a.c. systems 1 Scope This standard specifies the technical requirements, test methods and inspection rules of disconnectors of metal-oxide surge arresters for a.c. systems with rated voltage greater than 1kV (hereinafter referred to as disconnectors). This standard is only applicable to disconnectors designed to withdraw faulted surge arresters from a.c. systems and can be clearly identified. 2 Normative references The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. GB/T 191 Packaging - Pictorial marking for handling of goods GB/T 2423.22-2012 Environmental testing - Part 2: Tests methods - Test N: Change of temperature GB/T 2900.12 Electrotechnical terminology - Surge arresters low-voltage surge protective devices and components GB/T 2900.19 Electrotechnical terminology - High-voltage test technique and insulation co-ordination GB 11032-2010 Metal oxide surge arresters without gaps for A. C. systems GB/T 13384 General specifications for packing of mechanical and electrical product GB/T 16927.1 High-voltage test techniques - Part 1: General definitions and test requirements GB/T 16927.2 High-voltage test techniques - Part 2: Measuring systems GB/T 16927.4 High voltage and high current test techniques - Part 4: Definitions and requirements for test currents and measuring systems 3 Terms and definitions For the purposes of this document, the terms and definitions given in GB/T 2900.12, GB/T 2900.19 and GB 11032-2010 as well as the following apply. 3.1 arrester disconnector device that disconnects the arrester from the system when the arrester fails, which is used to prevent continuous system fault and can be clearly identified Note: Generally, the disconnector does not be able to cut off the fault current flowing through the arrester, which is not the function of the device. 3.2 the curve of operation characteristic of disconnector envelope curve of the relationship between action current and action time of disconnector 4 Marking The nameplate or enclosure of arrester disconnector shall include at least the following information,

Foreword i 1 Scope 2 Normative references 3 Terms and definitions 4 Marking 5 Standard ratings 5.1 Nominal frequency 5.2 Nominal discharge current 6 Operating conditions 6.1 Normal operating conditions 6.2 Abnormal operating conditions 7 Technical requirements 7.1 General provisions 7.2 Appearance requirements 7.3 Mechanical properties 7.3.1 General 7.3.2 Bending load 7.3.3 Tensile load 7.3.4 Torsional load 7.4 Sealing performance 7.5 Current impulse withstand test 7.5.1 High current impulse withstand test 7.5.2 Long duration current impulse withstand test 7.5.3 Lightning impulse discharge test 7.6 Ampere-second characteristic test 7.7 Operating duty test 8 Test requirements 8.1 Measuring equipment 8.2 Test specimens 8.3 Requirements of impulse current waveform and peak value 8.4 Requirements of impulse voltage waveform and peak value 8.5 Appearance inspection 8.6 Mechanical tests 8.6.1 Bending load test 8.6.2 Tensile load test 8.6.3 Torsional load test 8.7 Sealing performance test 8.7.1 Hot and cold water immersion test 8.7.2 Temperature cycling test 8.8 Current impulse withstand test 8.8.1 High current impulse withstand test 8.8.2 Long duration current impulse withstand test 8.8.3 Lightning impulse discharge test 8.9 Ampere-second characteristic test 8.9.1 Preparation of test specimens 8.9.2 Test procedures 8.9.3 Test valuation 8.10 Operating duty test 8.10.1 Preparation of test specimen 8.10.2 Test procedures 8.10.3 Test valuation 9 Inspection rules 9.1 General provisions 9.2 Type test 9.3 Routine test and sampling test 9.3.1 Routine test 9.3.2 Sampling test 10 Packaging, transportation and storage 10.1 Packaging 10.2 Technical documents provided together with product 10.3 Transportation and storage Annex A (Informative) Basic classification of disconnectors Annex B (Normative) Abnormal operating conditions Annex C (Informative) Table of bolt size and tightening torque Annex D (Normative) Type test procedure of disconnector Annex E (Informative) Comparison table of typical ampere-second characteristics of disconnector Annex F (Informative) Comparison table of typical ampere-second characteristics of fuse or circuit breaker Bibliography Figure D.1 Type test procedures of disconnector Table 1 Correspondence table for operating power frequency current of disconnector Table 2 Type test of disconnector Table 3 Routine test of disconnector Table 4 Sampling test of disconnector Table A.1 Basic classification of disconnectors Table C.1 M6~M24 bolt size and tightening torque (when tightening torque requirements are indicated) Table C.2 M6~M24 bolt size and tightening torque (when tightening torque requirements are not indicated) Table E.1 Ampere-second characteristics of disconnector not used with fuse or circuit breaker Table E.2 Ampere-second characteristics of disconnector used with fuse or circuit breaker Table F.1 Comparison table of typical ampere-second characteristics of fuse or circuit breaker