1、 AbstractIn recent years,while the Power Grid Corp vigorously carried out the transformation and construction of distribution network,it further promotes the management of the source and the overall quality management,and improves the guarantee capability of the power grids quality and the reliabili
2、ty of the operation.However,there is still a phenomenon that the qualified rate of the equipment is high and the fault of the running equipment is relatively large,and the safe and stable operation of the power grid is affected in a certain extent.This paper optimizes and innovating the management m
3、ode of distribution network equipment quality inspection and management under the new situation,studies the allocation and construction model of differential test capability,puts forward the hierarchical quality inspection system structure mode,in order to improve the quality supervision ability of
4、the distribution network equipment before entering the net,and ensure the essential safety of the power grid equipment and the stability of the power grid.Index TermsDistribution network equipment,Quality inspection,Quality management I.PREFACE n recent years,the Party Central Committee and the Stat
5、e Council have attached great importance to quality work,put forward to focus on improving the quality and efficiency of development,put the strategy of quality and power in a more prominent position,strengthen the overall quality supervision,improve the quality level in an all-round way,accelerate
6、the cultivation of new advantages of international competition,and lay a solid quality foundation for the goal of the two one hundred years.The State Council and relevant departments have successively formulated the strategic development plan,such as the outline of quality development(2011-2020 year
7、s),National Metrology development plan(2013-2020 years),national medium and long term development plan of science and technology and so on.The national quality and technology base(NQI)is incorporated into the national 13th Five-Year plan.Among them,the national medium and long term plan for science
8、and technology development indicate that the system of testing laboratory,certification and accreditation and technical trade measures should be improved,and the State Quality Inspection Administration proposed that by 2020,the efficiency of the national quality infrastructure will be fully released
9、.The national quality infrastructure system such as metrology,standards,inspection,certification and accreditation will be integrated and efficient.For the Power Grid Corp,the distribution network equipment management is an important support for the construction and production of the power grid.The
10、safe and stable operation of the power grid depends on the quality of the power equipments.Strengthening the quality control of the equipments used in the entire power grid is the foundation and guarantee for improving the equipment management and improving the safe and stable operation of the power
11、 grid.For the high technology content of distribution network equipment,once the quality problem has a huge impact,it will not only cause the major economic losses of the power grid enterprises themselves,but also cause significant political and social impact,produce a series of accidents,bring a se
12、ries of disasters,and even become a social disaster.Therefore,promoting suppliers to provide qualified and high-quality products is not only an inevitable requirement for safeguarding the interests of enterprises themselves,but also for the social responsibilities of power grid enterprises.The 2017
13、Xian Okai cable incident also raised the publics attention to the quality management of railway,electricity and other social public service enterprises,and reminding the importance of equipment quality to the whole society.With the further improvement of the equipment procurement intensity in power
14、grid,and the overcapacity in domestic power transmission and distribution equipment,the competition between the suppliers and the power supply and distribution equipment is becoming more and more fierce.The situation of the distribution network equipments high profit is gradually broken,and the purc
15、hase price of equipments is becoming more and more reasonable.At the same time,due to the full price competition among suppliers,the hidden dangers of quality are also exposed,and some suppliers bad practices Research on quality inspection management mode of distribution network equipment WANG Rui，C
16、hina Electric Power Research Institute I 2018 China International Conference on Electricity Distribution Tianjin,17-19 Sep.2018CICED2018 Paper No.201805280000320 Page1/5 352 in actual supply also happen from time to time.The guarantee of equipment supply quality will undoubtedly affect the safety an
17、d stability of the entire power grid,and it is also a new topic for the electric power equipment enterprises in the new period.At present,Power Grid Corp vigorously carry out distribution network transformation and construction,and the demand for quality inspection of related power grid construction
18、 equipment is huge.It is not necessary and feasible for all the grass-roots units in the Power Grid Corp to build all distribution network equipment test capabilities,and the construction of the equipment quality testing system needs to be built in the new situation.On the basis of optimization and
19、innovation,the structure and construction mode of hierarchical quality inspection system are studied,and the configuration and construction requirements of the differential test capability of grass-roots units are clearly defined in order to improve the quality supervision ability of the distributio
20、n network equipment before entering the net,and to ensure the essential safety of the distribution network equipment and the stable operation of the power grid.II.CONSTRUCTION MODE OF QUALITY INSPECTION SYSTEM FOR DISTRIBUTION NETWORK EQUIPMENT Most of the domestic Power Grid Corp are the large cent
21、ral enterprises,the management class of the company basically follows the management structure of the central ministries and commissions in history.The subordinate management units of the general company are basically set up according to the administrative division,which are formed by the provincial
22、 companies,the city companies,the county companies and so on.Considering the organizational structure and management mode of the Power Grid Corp,and the needs of the intensive management of equipments,the three level quality testing system of the headquarters level,the provincial company level and t
23、he city level of the city is designed.As shown in Figure 1.According to the factors include the amount of equipment used,testing needs and importance and so on,the commonly used distribution network equipment is classified and divided into 25 types,and the research on the 25 types include power dist
24、ribution transformers,JP cabinet,high voltage switchgear,iron tower,concrete pole,etc.According to the functional positioning of various levels of testing institutions,and the input factors of different types of testing projects,three grades of A,B and C are formulated from high to low in the test p
25、rojects and equipment configuration for different grades of testing institutions,and it is suggested that the company headquarters level,provincial company level,and the city level testing organizations should carry out the construction of testing capability according to the standards at all levels.
26、The headquarters level testing organization should be the benchmarking unit of the whole testing system.PowerGridCorpheadquartersHeadquarterslevelTestingcenterprovinciallevelTestingcenterNo.2provinciallevelTestingcenterNo.4provinciallevelTestingcenterNo.1provinciallevelTestingcenterNo.3ZoneNo.1ZoneN
27、o.2Legend：Regional centerManagement relationshipTechnical guidance relationshipCitylevelTestingcenterNo.1CitylevelTestingcenterNo.nProvincialcompanyNo.2MinistryofMaterialsandEquipmentProvincialcompanyNo.1MinistryofMaterialsandEquipmentProvincialcompanyNo.3MinistryofMaterialsandEquipmentProvincialcom
28、panyNo.4MinistryofMaterialsandEquipmentProvincialcompanyMinistryofMaterialsandEquipmentprovinciallevelTestingcenterCitylevelTestingcenterProvincialcompanylevelHeadquarterslevelCitycompanylevelSynergetic relationshipZoneNo.nProvincialcompanyMinistryofMaterialsandEquipmentprovinciallevelTestingcenterC
29、itylevelTestingcenter Figure 1 Detection architecture diagram It should undertake the central functions of standard setting,quantity transmission and technical guidance in the whole testing system.The test items and testing equipment should be configured according to the standard of the whole projec
30、t.Provincial testing institutions should be the main strength of 2018 China International Conference on Electricity Distribution Tianjin,17-19 Sep.2018CICED2018 Paper No.201805280000320 Page2/5 353 distribution network equipment testing,and undertake the main specific work of distribution network eq
31、uipment testing,and should carry out capacity construction according to the standards that can cover most of the inspection items.Because of the limited investment of technical resources and mainly undertake the construction work,the city level testing organizations should configure the test items a
32、nd testing equipment similar to the transfer test.The testing capabilities of distribution transformers are configured for A,B,C levels of projects and testing equipment required to see Table 1 and table 2.The testing ability of other equipments is omitted.Table 1 Distribution transformer detection
33、project configuration table SN Entry name Testing capability level A B C1 Measurement of DC insulation resistance between windings to ground and windings 2 Absorption ratio measurement 3 Dielectric loss factor(tan)of capacitance of insulation system(oil immersed transformer)4 Capacitance measurement
34、 between windings to ground and windings 5 Winding resistance measurement 6 Voltage ratio measurement and joint group marking verification 7 Measurement of no-load loss and no-load current 8 Measurement of short circuit impedance and load loss 9 Pressure test of external application 10 Induction pre
35、ssure test 11 Partial discharge measurement(dry transformer)12 Test of insulating liquid(oil immersed transformer)13 Pressure seal test(oil immersed transformer)14 Temperature rise test 15 Lightning shock test(full wave and cut wave)16 No-load and no-load current measurements at rated voltages of 90
36、%and 110%17 Short-time overload capacity test(oil immersed transformer)18 Sound level measurement 19 Pressure deformation test(oil immersed transformer)20 Zero sequence impedance measurement for three phase transformers(oil immersed transformers)21 Measurement of dissolved gas in insulating liquid 2
37、2 Short-circuit endurance test Table 2 distribution transformer detection equipment configuration table SN Equipment requirements Equipment/instrument nameKey parameters and requirements 1 Insulation resistance meter Analogue：Voltage：500V5000V Measuring range：010G Accuracy：Class 15 Digital：Voltage：5
38、00V5000V Measuring range：0100G Accuracy：Class 5（01G）Class 10（more than 1G）2 Dielectric loss factor tester Measuring range：Dielectric loss：0.00010.99 Capacitance：10pF40nF 3 DC resistance tester Current:(0.120)A Measuring range：1m 2k Accuracy：0.2%4 Variable ratio tester Measuring range：11000 Accuracy：
39、0.2%Sensitivity：0.2%5 Power analyzer Accuracy：0.5%6 Current transformer Accuracy：0.2%7 Voltage transformer Accuracy：0.2%8 Three phase voltage regulator Rated capacity：150kVA Rated output voltage：650V 9 Peak voltmeter Meet the requirements in GB/T 16927.2 10Capacitance divider Accuracy：3%；11Single-ph
40、ase voltage regulator Rated capacity：50kVA 12 Test transformer Rated capacity：50kVA output voltage：50kV 13Three phase intermediate frequency generating set Output power：50kW 14Partial discharge tester Meet the requirements of GB/T 7354 15 Oil pressure tester Meet the requirements of GB/T 50716Oil di
41、electric loss tester Meet the requirements of GB/T 5654 17 Pressure gauge Measuring range：050kPa 18 Air compressor The inflating pressure is not less than 40kPa 19Multichannel temperature testerIt should be able to record automatically,with a record interval of not more than 5min,and a measuring cha
42、nnel of not less than 6.20 Impact test systemMeet the requirements of GB/T 16927.2 III.DIFFERENTIAL DETECTION CAPABILITY CONFIGURATION STRATEGY AND MODEL With the influence of some factores,such as economic capacity,regional characteristics,power grid planning,2018 China International Conference on
43、Electricity Distribution Tianjin,17-19 Sep.2018CICED2018 Paper No.201805280000320 Page3/5 354 equipment scale and so on,various Power Grid Corp need to carry out differential testing ability construction according to their own actual conditions.According to the restriction and influence degree of di
44、fferent factors to the construction of testing capability.Classifying from many aspects can directly reflect the parameters of the detection capability allocation strategy,include the types of equipment,the grade of the annual testing,the correlation of testing project,the time of testing equipment,
45、the time of artificial work,the degree of coordination,the importance of the testing project,the current situation and so on.The different parameter values are set according to the characteristics of each parameter.See Table 3.Table 3 Impact factor table for detection capability configuration SN Imp
46、act factors Values 1 the types of equipment 25 types of equipments 2 the grade of the annual testing/3 the correlation of testing project Strong/medium/weak 4 the time of testing equipment Automation equipment/non-automation equipment5 the time of artificial work Automation equipment/non-automation
47、equipment6 the degree of coordination Strong/medium/weak 7 the importance of the testing project High/medium/low 8 the current situation Yes/no Determine the values of each parameter,and configure the different weights of the different parameters,the construction configuration model of the quality t
48、esting ability of the distribution network equipment can be established.Each unit can apply the model to determine the specific items and the related resource requirements of the testing ability according to the actual situation.A schematic diagram of the configuration model of the testing capabilit
49、y is shown in Figure 2.ConfigurationmodelofdetectioncapabilityconstructionTypeofmaterial;Annualmeasurementlevel;Testitemcorrelationdegree;Testequipmentworkinghours;Detectionofartificialtime;Coordinationdegree;Theimportanceoftestingtheproject;Thecurrentsituation;Testprojectconfiguration;Equipmentconf
50、iguration;Staffing;Figure 2 Configuration model diagram of testing capability construction IV.OPERATION AND MANAGEMENT MODE OF QUALITY INSPECTION SYSTEM FOR DISTRIBUTION NETWORK EQUIPMENT At present,the inspection rules to the third party work laboratories from the Certification and accreditation ad
