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MHT6049-2020 English PDF

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MHT6049-2020: (Buried cable for airport navigation aid light loop)
Status: Valid
Standard IDUSDBUY PDFLead-DaysStandard Title (Description)Status
MH/T 6049-2020579 Add to Cart 4 days (Buried cable for airport navigation aid light loop) Valid

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Basic data

Standard ID: MH/T 6049-2020 (MH/T6049-2020)
Description (Translated English): (Buried cable for airport navigation aid light loop)
Sector / Industry: Civil Aviation Industry Standard (Recommended)
Classification of Chinese Standard: V56
Classification of International Standard: 49.100
Word Count Estimation: 23,258
Date of Issue: 2020-07-20
Date of Implementation: 2020-10-01
Older Standard (superseded by this standard): MH/T 6049-2008
Issuing agency(ies): Civil Aviation Administration of China

MHT6049-2020: (Buried cable for airport navigation aid light loop)

---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.
Underground electrical cable for airport lighting circuits ICS 49.100 V 56 Civil Aviation Industry Standard of the People's Republic of China Replace MH/T 6049-2008 Buried cable for airport navigation aid light loop 2020-07 -20 released 2020-10 -01 Implementation Issued by Civil Aviation Administration of China

Table of contents

Foreword...II 1 Scope...1 2 Normative references...1 3 Terms and definitions...2 4 Cable model, specification, naming, code and product representation...2 5 Use characteristics...3 6 Technical requirements...3 7 Test...5 8 Product acceptance rules, finished cable marking and cable packaging, transportation and storage...15 Appendix A (normative appendix) Semi-conductive shielding resistivity measurement method...18

Foreword

This standard was drafted in accordance with the rules given in GB/T 1.1-2009. This standard replaces MH/T 6049-2008 "Buried Cables for Airport Navigation Aid Light Circuit". Compared with MH/T 6049-2008, the main technical The technical content changes are as follows. - According to the National Metrology Technical Specification JJF 1001-2011 "General Metrology Terms and Definitions", the definition of nominal value has been revised (see 3.1); -Modified the technical requirements of conductors (see.2008 version 6.1.1, 6.1.1); -Modified the technical requirements for the integrity of the sheath (see.2008 version 6.4.4, 6.4.4); - Modified the technical requirements for conductor DC resistance test (see 7.2.2 and 7.2.2 of the.2008 edition); -Modified the partial discharge test requirements (see 7.2.4, 7.2.3 and 7.4.4 of the.2008 edition); --- Increase the electrical test of the sheath in the routine test (see 7.2.5); --- Added ST7 sheath high temperature pressure test in sampling test (see 7.3.1.1); - Modified the technical requirements for bending test (see.2008 edition 7.4.3, 7.4.3); -Modified the acceptance rules (see.2008 version 8.1.2, 8.1.2); -Modified the technical requirements of the logo (see.2008 version 8.2.1, 8.2.1); - Amended to be revised in accordance with the requirements of the national standard GB/T 8170 (see.2008 version 7.3.3.1), and GB/T 8170 is listed Include normative references; -Add Appendix A. This standard was proposed and interpreted by the Airport Department of the Civil Aviation Administration of China. This standard is under the jurisdiction of the China Academy of Civil Aviation Science and Technology. Drafting organizations of this standard. China Civil Aviation Science and Technology Research Institute, Shanghai National Cable Testing Center Co., Ltd. The main drafters of this standard. Liu Yuhong, Li Chuang, Zhu Tao, Yan Jun, Wang Li. Buried cable for airport navigation aid light loop

1 Scope

This standard specifies the type, specification, naming, code, product representation, use characteristics, Technical requirements, testing, product acceptance rules, finished cable marking and cable packaging, transportation and storage. This standard is applicable to the manufacture, acceptance and delivery of cables for the serial main circuit of airport navigation lights.

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 2951.11-2008 Cable and optical cable insulation and sheath materials general test methods Part 11.General test methods thickness and External dimension measurement mechanical performance test (IEC 60811-1-1.2001, IDT) GB/T 2951.12-2008 General test methods for insulation and sheath materials of electric and optical cables-Part 12.General test methods Heat aging Test method (IEC 60811-1-2.1985, IDT) GB/T 2951.13-2008 General test methods for insulating and sheathing materials of electric and optical cables-Part 13.General test methods Density measurement Shrinkage test (IEC 60811-1-3.2001, IDT) GB/T 2951.14-2008 General test methods for insulation and sheath materials of electric and optical cables-Part 14.General test methods Low temperature test Inspection (IEC 60811-1-4.1985, IDT) GB/T 2951.21-2008 General test methods for insulating and sheathing materials of electric and optical cables-Part 21.Special tests for elastomer mixtures Method ozone resistance test, thermal extension test, mineral oil immersion test (IEC 60811-2-1.2001, IDT) GB/T 2951.31-2008 General test methods for insulating and sheathing materials of electric and optical cables-Part 31.Special test for PVC mixture Test method High temperature pressure test Anti-cracking test (IEC 60811-3-1.1985, IDT) GB/T 2951.32-2008 General test methods for insulating and sheathing materials of electric and optical cables Part 32.Special test for PVC mixture Test method weightlessness test thermal stability test (IEC 60811-3-2.1985, IDT) GB/T 2951.41-2008 General test methods for insulating and sheathing materials of electric and optical cables-Part 41.Polyethylene and polypropylene mixture Special test method Resistance to environmental stress cracking test Melt index measurement method Direct combustion method to measure carbon black and (or) minerals in polyethylene Filler content thermogravimetric analysis (TGA) to measure carbon black content, microscopic method to evaluate carbon black dispersion in polyethylene (IEC 60811-4-1.2004, IDT) GB/T 3048.5-2007 Electric wire and cable electrical performance test method Part 5.Insulation resistance test GB/T 3048.12-2007 Test methods for electrical properties of wires and cables Part 12.Partial discharge test GB/T 3956 Cable conductor GB/T 6995.3 Wire and Cable Identification Marking Method Part 3.Wire and Cable Identification Mark GB/T 8170 Numerical rounding rules and the expression and determination of limit values GB/T 18380.12 Fire test of electric and optical cables under flame conditions Part 12.Vertical flame spread of single insulated wire and cable Test-lkW premixed flame test method JB/T 8137 Wire and cable delivery tray IEC 60229.2007 Cable-Test of extruded outer sheath with special protective function

3 Terms and definitions

The following terms and definitions apply to this standard. 3.1 Nominal value The rounded value or approximate value of the characteristic quantity of a measuring instrument or measuring system in order to provide guidance for proper use. Example 1.The nominal value marked on the standard resistor. 100 kg; Example 2.The amount marked on the single-scale measuring cup. 1 000 mL; Example 3.The concentration of the substance in the constant temperature solution HCIr. 0.1 mol/L; Example 4.The temperature of the constant show box is -20 ℃. Note. "Nominal value" and "nominal value" should not be confused with "nominal characteristic value". [Source. JJF 1001-2011, 7.4] 3.2 Median value When arranging several values obtained from the experiment in increasing (or decreasing) order, if the number of values is odd, the middle value It is the middle value; if the number of values is even, the average of the middle two values is the middle value. 3.3 Routine tests The test carried out by the manufacturer on all manufacturing lengths of the finished cable to check whether all cables meet the specified requirements. 3.4 Sample tests Carried out by the manufacturer, carried out on the finished cable or some parts taken from the finished cable at a prescribed frequency to check whether the cable is Whether it meets the requirements of the test. 3.5 Type tests A test carried out before supply according to general commercial principles to prove that the cable has good performance that can meet the expected use conditions. Note. The characteristic of this test is that unless the cable material or design or manufacturing process changes may change the characteristics of the cable, it does not need to be repeated after the test is done. 4 Cable model, specification, naming, code and product representation 4.1 Cable type and specification The cable model and specifications are shown in Table 1. 4.2 Naming and Code Buried cable D for the main circuit of airport navigation aid lights; 4.3 Product representation method Products are represented by model, rated voltage, specification and number in this text. Example. Rated voltage 5 kV copper core XLPE insulated polyethylene sheathed buried cable for the main circuit of airport navigation lights, single core nominal section 6 mm2, indicating

5 Use characteristics

5.1 The rated voltage is 5 kV. 5.2 The maximum rated temperature of the cable conductor is 90 ℃. 5.3 During short circuit (the longest duration is 5 s), the maximum temperature of the conductor shall not exceed 250 ℃. 5.4 The allowable bending radius of the cable is not less than 12 times the outer diameter of the cable. 5.5 Water tree resistant cross-linked polyethylene (TRXLPE) cable is suitable for long-term use under humid environmental conditions.

6 Technical requirements

6.1 Conductor 6.1.1 The conductor should be tin-plated or untinned copper conductor, and should comply with GB/T 3956 Type 2 round conductor or Type 5 flexible conductor. The nominal cross-sectional area of the conductor is 6 mm2. 6.1.2 The surface of the conductor should be smooth and free of oil, copper chips, moisture, burrs, sharp edges, bumps or breaks. 6.2 Shield 6.2.1 Classification The cable should be a shielded cable, including. -Conductor shield; --Insulation shielding. The conductor shielding should meet the requirements of 6.2.2, and the insulation shielding should meet the requirements of 6.2.3. The performance of the extruded shielding material should meet the requirements of Table 2. 6.2.2 Conductor shield The conductor shield should be non-metallic and consist of extruded cross-linked semi-conductive materials. The conductor shield should be evenly covered on the conductor and insulated Closely integrated. The shielding surface of the conductor should be smooth, and there should be no obvious ridges, sharp corners, particles, scorching, stripping or scratches. Thick at the thinnest point The degree should not be less than 0.15 mm. 6.2.3 Insulation shield 6.2.3.1 Non-metal semiconducting layer The thickness of the thinnest part of the cross-linked semi-conductive material that is directly extruded and insulated and can be peeled off shall be no less than 0.30 mm. 6.2.3.2 Metal shielding layer The metal shield should be a layer of copper tape (tinned copper tape or unplated copper tape can be used). The thickness of the thinnest part of the metal strip should be no less than 0.07 mm, and the minimum overlap rate between the copper strips should be no less than 15%. 6.3 Insulation The insulating material should be cross-linked polyethylene insulating material (XLPE) or ethylene propylene rubber insulating compound (EPR). When using cross-linked polyethylene insulating material, water tree-resistant cross-linked polyethylene insulating material (TRXLPE) should be used. The nominal thickness of the insulation is 2.8 mm. The average insulation thickness measurement should not be less than 2.8 mm, the minimum thickness should not be less than 90% of the nominal value, and the The difference between the measured thickness should not be more than 0.4 mm. 6.4 Sheath 6.4.1 Appearance All cables should be sheathed. The sheath is usually black. If the manufacturer and the customer reach an agreement, other colors other than black are allowed. To adapt to the specific environment in which the cable is used. The outer sheath is squeezed outside the metal shield, the surface should be smooth and round, and the cross section should not be visible to the naked eye Stoma. 6.4.2 Materials The sheath material should be one of the following materials. --Polyvinyl chloride (ST2 type); --Polyethylene (ST7 type); -Neoprene or similar polymer (SE1 type). When the cable sheath is required to have chemical resistance, it should not contain ingredients harmful to humans or the environment. 6.4.3 Thickness The thickness of the thinnest part of the sheath should not be less than 1.40 mm. 6.4.4 Completeness The sheath shall withstand a power frequency spark voltage test of 8.4 kV. If there is a semi-conductive layer on the surface of the sheath, the 8.4 kV power frequency spark electric For the voltage test, the DC voltage test shall be carried out in accordance with 7.2.5. 6.5 Structure The cable structure size should meet the requirements of Table 3.

7 Test

7.1 Test conditions Unless otherwise specified, the test shall be carried out at an ambient temperature of 20 ℃ ± 15 ℃. The frequency of the power frequency test voltage should be 49 Hz to 61 Hz, the waveform should be basically a sine wave, and the quoted value is an effective value. 7.2 Routine test 7.2.1 Basic requirements for routine tests Routine tests are usually performed on each cable manufacturing length. Routine tests include the following. a) Conductor DC resistance test (see 7.2.2); b) Partial discharge test (see 7.2.3); 7.2.2 Conductor DC resistance test Conduct resistance measurements on all conductors of each cable length in the routine test. Before the test, the finished cable or the sample taken from the finished cable should be stored for at least 12 hours in a test room where the temperature is maintained. If in doubt Whether the conductor temperature is consistent with the room temperature, the cable should be stored in the test room for 24 hours and then the resistance value measured, or the conductor sample can be placed in a temperature controllable Measure the resistance value after at least 1 h in the liquid tank. The measured resistance value should be corrected to a value of 20 ℃ and a length of 1 km according to the formula and coefficient given in GB/T 3956. The DC resistance of each conductor at 20°C should not be greater than the maximum value specified in GB/T 3956. 7.2.3 Partial discharge test The insulated core should be placed for at least 7 days before performing a partial discharge test (if the buyer and the manufacturer agree through negotiation, the placement time can be shortened). Carry out partial discharge test according to GB/T 3048.12, the test sensitivity should be 10pC or better. Under the test voltage of 18 kV, there should be no detectable discharge that exceeds the declared test sensitivity caused by the cable under test. Note. During the test, any discharge of the cable may be harmful. 7.2.4 AC voltage test 7.2.4.1 Conduct AC voltage test at ambient temperature, using 18kV power frequency AC voltage. 7.2.4.2 The test voltage is applied between the conductor and the metal shield. It should be increased to the specified voltage at a constant speed, not exceeding 1.8 kV within 10 s, Increase to 18 kV within 60 s. The duration of the test voltage is 5 min, and there should be no breakdown of the insulation. 7.2.5 Electrical test of cable outer sheath If there is an extruded semi-conducting layer on the outer sheath of the cable, perform a DC voltage test according to the provisions of 3.1 in IEC 60229.2007.In care 11.2 kV DC voltage is applied between the outer surface of the sleeve and the metal shield. The metal shield is a negative electrode. The test voltage lasts for 1 min. There should be no breakdown of the outer sheath. 7.3 Sampling test 7.3.1 Basic requirements 7.3.1.1 The sampling test includes the following. a) Conductor inspection; b) Structural dimension inspection; c) Insulation and sheath mechanical performance test; d) ST2 type and ST7 type sheath high temperature pressure test; e) Low temperature bending test; f) SE1 type thermosetting sheath oil resistance test; g) Thermal extension test of insulation and SE1 type sheath. 7.3.1.2 According to the agreed quality control agreement, samples shall be taken from the manufacturing length of the cable for testing. If there is no agreement, proceed according to Table 4 Line sampling. 7.3.1.3 If any sample does not meet any of the test requirements specified in 7.3.1.1, two additional samples should be taken from the same batch. The grid item is tested again. After the tests of the two additional samples are qualified, the batch of cables can be considered qualified. 7.3.2 Conductor inspection Use visual inspection and measurement methods to check whether the conductor structure meets the requirements of 6.1. 7.3.3 Structural dimension inspection 7.3.3.1 Measurement of conductor shielding, insulation, insulation shielding and sheath thickness Conduct the measurement of conductor shielding, insulation, insulation shielding and sheath thickness in accordance with the provisions of Chapter 8 of GB/T 2951.11-2008. Select one end of each manufactured-length cable used for the test to cut a small piece of cable as a sample. Before sampling, remove possible damage part. The thickness measurement value should be rounded off in accordance with the requirements of GB/T 8170. 7.3.3.2 Measurement of metal belt Use a micrometer with two flat probes with a diameter of 5 mm and an accuracy of ±0.01 mm to measure metal on the center line of the metal strip width With thickness. 7.3.3.3 Diameter measurement Measure the outer diameter of the cable according to Chapter 8 of GB/T 2951.11-2008. 7.3.4 Mechanical performance test of insulation and sheath 7.3.4.1 Insulation mechanical performance test before and after aging 7.3.4.1.1 Sampling Sampling and preparation of test pieces are carried out according to the provisions of Chapter 9 of GB/T 2951.11-2008. 7.3.4.1.2 Aging treatment Under the conditions specified in Table 5, the aging treatment shall be carried out in accordance with the provisions of Chapter 8 of GB/T 2951.12-2008. 7.3.4.1.3 Pretreatment and mechanical performance test Carry out pretreatment and mechanical performance test according to the provisions of Chapter 9 of GB/T 2951.11-2008. 7.3.4.1.4 Determination of test results The physical performance test of the test piece before and after aging should be carried out at the same time, and the test results should meet the requirements of Table 5. 7.3.4.2 Test of the mechanical properties of the sheath 7.3.4.2.1 Sampling Sampling and preparation of test pieces shall be carried out in accordance with the provisions of Chapter 9 of GB/T 2951.11-2008. 7.3.4.2.2 Aging treatment Under the conditions specified in Table 6, the aging treatment is carried out in accordance with the provisions of Chapter 8 of GB/T 2951.12-2008. 7.3.4.2.3 Pretreatment and mechanical performance test Carry out pretreatment and mechanical performance test according to the provisions of Chapter 9 of GB/T 2951.11-2008. The physical performance test of the test piece before and after aging should be carried out at the same time, and the test results should meet the requirements of Table 6. 7.3.5 High temperature pressure test of ST2 and ST7 sheath Carry out high temperature pressure test according to the provisions of Chapter 8 of GB/T 2951.31-2008.The test conditions are shown in Table 7 and Table 12. 7.3.6 Low temperature bending test of finished cable Take a sample of the finished cable with a diameter of not less than 0.5 m, put it into the freezer at -25 ℃ ± 2 ℃, take out the sample after 1 h, and immediately follow the diameter of 8 The cylinder with the outer diameter of the cable ......
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