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MT/T 167-1987 English PDF

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MT/T 167-1987: (Mine insulated PVC sheathed communication cables)
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MT/T 167-1987English489 Add to Cart 3 days [Need to translate] (Mine insulated PVC sheathed communication cables)   MT/T 167-1987

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Standard similar to MT/T 167-1987

GB/T 2951.21   GB/T 2951.11   GB/T 3048.1   MT/T 386   

Basic data

Standard ID MT/T 167-1987 (MT/T167-1987)
Description (Translated English) (Mine insulated PVC sheathed communication cables)
Sector / Industry Coal Industry Standard (Recommended)
Classification of Chinese Standard K13
Word Count Estimation 14,139
Date of Issue 11/18/1987
Date of Implementation 12/25/1987
Summary This standard applies to coal mine and other polyethylene insulated PVC sheathed communication cables for use in explosive atmospheres.

MT/T 1:

---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.
(Mine insulated PVC sheathed communication cables) Ministry of Coal Industry Standards MT/T 167-87 Mine polyethylene insulated PVC sheath Communication Cable Published on November 18, 1987 1987-12-25 Implementation Published by the Ministry of Coal Industry of the People's Republic of China

Contents

1 Model and specifications 1 2 Working conditions 2 3 Technical requirements 2 4 Test method 6 5 Inspection rules 7 6 Marking, packaging, transportation and storage 8 Appendix A Technical Performance of Aluminum Polyethylene Composite Tape (Supplementary) 10 Appendix B Main technical properties and test methods of mixed steel wire and braided armored steel wire (supplement) B.1 Technical performance 11 B.2 Test method 11 Mine polyethylene insulated PVC sheath Communication Cable This standard applies to polyethylene insulated polyvinyl chloride sheathed communication cables used in underground coal mines and other explosive gas environments. Hereinafter referred to as the cable).

1 Model and specifications

1.1 Table 1 shows the cable types and applications. Table 1 Model name application range HUYV mining polyethylene insulated PVC sheathed communication cable HUJYV Mine-reinforced core-core polyethylene insulated PVC sheathed communication cable For level and inclined lanes with high mechanical damage HUYBV Mine polyethylene insulated galvanized steel wire braided PVC sheath Communication Cable For flat and inclined lanes with high mechanical impact HUYAV Mine polyethylene insulation aluminum polyethylene adhesive sheath PVC protection Communication cable For wet inclined shafts and alleys HUYA32 Mine polyethylene insulated aluminum polyethylene bonded sheath steel wire armored poly Vinyl chloride sheathed communication cable For vertical or inclined shafts 1.2 Cable specifications The cable specifications should meet the requirements of Table 2. Table 2 HUYV HUJYV HUYBV HUYAV HUYA32 Logarithm × Core number 1 × 2 2 × 2 1 × 4 5 × 2 1 × 2 2 × 2 5 × 2 10 × 2 20 × 2 20 × 2 30 × 2 50 × 2 30 × 2 50 × 2 80 × 2 1.3 Cable Nomenclature and Representation 1.3.1 Naming Code Mine communication cable HU Copper wire core omitted Steel copper reinforced wire core J Polyethylene insulation Y Aluminum polyethylene bonding sheath A Polyethylene inner sheath omitted Woven armor B PVC sheath V Fine round steel wire armor, PVC outer covering 32 1.3.2 Representation The cable is indicated by model, specification and standard number. Such as. Mine polyethylene insulated aluminum-polyethylene bonded sheathed steel wire armored PVC sheathed communication cable with 30 twisted pair cores Shown as. HUYA32 30 × 2 MT 167-87 Mine polyethylene insulated PVC sheathed communication cables with a star-stranded core should be expressed as. HUYV 1 × 4 MT 167-87

2 Working conditions

2.1 The cable should work properly in the following environments. a.Temperature. -40 ~ 50 ℃; b. Monthly average maximum relative humidity. 95% (at 25 ° C). 2.2 The cable should be able to adapt to the following laying and installation conditions. a. Temperature. not lower than -10 ℃; b. Minimum bending radius during installation. HUYV and HUJYV types should be 10 times the outer diameter of the cable, and other models are 15 times the outer diameter.

3 Technical requirements

3.1 Components 3.1.1 Conductor 3.1.1.1 HUYV type uses tinned soft round copper wire stranded conductor; HUJYV type uses tinned soft round copper wire and galvanized steel wire mixed twisted conductor; Other models use soft round copper wire. 3.1.1.2 The structure of the conductor shall comply with the requirements in Tables 3 to 7. table 3 Model specifications Core structure Number of pieces/Nominal diameter of single wire, mm Nominal thickness of insulation Nominal thickness of outer sheath mm HUYV 1 × 2 7/0.28 0.45 1.6 7.1 2 × 2 7/0.28 0.45 1.6 8.6 1 × 4 7/0.28 0.45 1.6 8.0 5 × 2 7/0.28 0.45 1.6 11.5 Table 4 Model specifications Core structure Number of pieces/Nominal diameter of single wire, mm Nominal thickness of insulation Nominal thickness of outer sheath mm HUJYV 1 × 2 4/0.28 copper wire 3/0.28 steel wire 0.45 1.6 7.1 2 × 2 4/0.28 copper wire 3/0.28 steel wire 0.45 1.6 8.6 table 5 Model specifications Core structure No./single wire nominal diameter mm Nominal insulation thickness Nominal inner sheath thickness Braided galvanized steel wire diameter Nominal outer sheath thickness Cable max Outer diameter mm HUYBV 5 × 2 1/0.8 0.35 1.5 0.20 ~ 0.30 1.6 15.6 10 × 2 1/0.8 0.35 1.5 0.20 ~ 0.30 1.6 18.4 20 × 2 1/0.8 0.35 1.5 0.20 ~ 0.30 2.0 23.4 Table 6 Model specifications Core structure No./single wire nominal diameter mm Nominal insulation thickness Aluminum polyethylene bonding Layer overlap width Nominal inner sheath thickness Nominal outer sheath thickness Cable max Outer diameter mm HUYAV 20 × 2 1/0.8 0.35 not less than 6 1.5 2.0 23.4 30 × 2 1/0.8 0.35 not less than 6 2.0 2.0 27.4 50 × 2 1/0.8 0.35 not less than 6 2.0 2.0 32.6 Table 7 Model specifications Core structure No./single wire nominal diameter mm Nominal insulation thickness Aluminum polyethylene bonding Cover overlap width Nominal inner sheath thickness Galvanized armored steel wire diameter Nominal outer sheath thickness Cable max Outer diameter mm HUYA32 30 × 2 1/0.8 0.35 not less than 6 2.0 not less than 1.6 2.5 32.6 50 × 2 1/0.8 0.35 not less than 6 2.0 not less than 1.6 2.5 37.3 80 × 2 1/0.8 0.35 not less than 6 2.2 not less than 2.0 2.5 43.0 3.1.2 Insulation 3.1.2.1 The insulation uses low-density polyethylene cable material, the nominal thickness should meet the requirements of Tables 3 to 7, and the average value of the insulation thickness should not be small At the specified nominal value, the thinnest point thickness is not less than the nominal value minus 0.05mm. 3.1.2.2 The insulation shall be tightly packed on the conductor, and it shall be easily peeled off without damaging the conductor or tin plating. The insulation surface should be smooth, uniform in color, and free from cracks and other damage. 3.1.3 Line Group 3.1.3.1 Insulated wire cores shall be twisted into wire groups. A pair of cores should be twisted, and the twisting pitch should not be greater than 120mm. Twisted or double twisted, the pitch is not more than 150mm. 3.1.3.2 Two pairs of insulated cores are applied in different colors. The common pair is red and white, the logo pair is blue and white, and the star twisted group is four The insulation of the insulated cores shall be red, blue, white and green. 3.1.4 Cable core The cables of one pair of cores and two pairs of cores can be directly used as the core of the cable; for more than two pairs of cables, the twisted pairs should be twisted concentrically To form a cable core, the twist direction of the outermost layer is right, and the twist direction between adjacent two layers must be opposite.Two adjacent pairs of wire groups in the same layer should use different There should be a marker pair in each layer. 3.1.5 Banding HUYBV, HUYAV, HUYA32 cable cores should be wrapped with a layer of plastic tape on the outside. Not less than 20% of the bandwidth, and the minimum must not be less than 5mm. 3.1.6 Adhesive coating HUYAV, HUYA32 type cables are covered with a layer of aluminum polyethylene composite tape longitudinally outside the plastic wrapping tape. The cover must be continuous and complete. The vertical package overlap should be greater than specified in Tables 6 to 7, and the overlap should be heat sealed. 3.1.7 inner sheath 3.1.7.1 The inner sheath of HUYBV, HUYAV and HUYA32 cables shall be made of low-density polyethylene cable material, and the nominal thickness shall meet Tables 5 to 7 allow a negative deviation of 20%. 3.1.7.2 The inner sheath shall be tightly packed on the cable core tape or aluminum polyethylene bonding sheath, and shall be easily peeled without damaging the insulation or adhesion Protective layer. The inner sheath surface should be flat and free of cracks and other mechanical damage. 3.1.8 Armor 3.1.8.1 The outer sheath of HUYBV cable shall be braided with galvanized thin steel wire armor. The diameter of galvanized steel wire shall meet the requirements of Table 5. Weaving coverage should be 25% ~ 35%. Galvanized steel wire can be welded by silver brazing, but the wire end is not allowed to be exposed. 3.1.8.2 The inner sheath of HUYA32 cable shall be galvanized steel wire armored, and the diameter of galvanized round steel wire shall meet the requirements of Table 7. 3.1.9 Outer Sheath 3.1.9.1 The outer sheath is blue, and non-flammable PVC cable material is used. The nominal thickness shall meet the requirements of Tables 3 to 7. The average thickness of the outer sheath should not be less than the specified nominal value. The thickness of the thinnest point of the outer sheath of HUYBV and HUYA32 cables should not be Less than 80% -0.2mm of the nominal value, other types should not be less than 85% -0.1mm of the nominal value. 3.1.9.2 The outer sheath shall be tightly packed on the cable core or steel wire armor layer, and shall be easily peeled without damaging the insulation, inner sheath or steel wire plating. Zinc layer. The outer sheath surface should be flat, uniform in color, and free from cracks, pores, inclusions, or other mechanical damage. 3.1.10 The maximum outer diameter of the cable shall meet the requirements in Tables 3 to 7. 3.2 Materials 3.2.1 Soft round copper wire shall meet the requirements of GB 3953-83 "Electric Round Copper Wire"; tin-plated soft round copper wire shall comply with GB 4910-85 "Tinned round copper wire" Copper Wire. 3.2.2 Low-density polyethylene for insulation and inner sheath shall comply with the provisions of cable materials in HG2-1398-81 "Low-density polyethylene resin". 3.2.3 The aluminum-polyethylene composite tape for bonding and protection shall meet the requirements of Appendix A of this standard. 3.2.4 Galvanized fine steel wire for mixed conductors and braided armors shall meet the requirements of Appendix B of this standard; galvanized steel wire for armoring shall meet GB 3082-84 "Galvanized Low Carbon Steel Wire for Armored Cables". 3.2.5 The polyvinyl chloride used for the outer sheath shall comply with the provisions of SG22-73 "Soft polyvinyl chloride plastic for cable industry". 3.3 Electrical performance requirements 3.3.1 The conductive core of the cable shall not be disconnected, connected to each other, or mixed. 3.3.2 The DC resistance value of the conductive core of the cable at 20 ° C shall meet the requirements of Table 8. 3.3.3 The insulation resistance of the cable insulation wire core at 20 ° C shall meet the requirements of Table 8. 3.3.4 The working capacitance of any pair of cables in the cable should meet the requirements in Table 8. 3.3.5 Between the insulated cores of the cable and between the insulated cores and the shield should be able to withstand the AC voltage withstand test specified in Table 8, which lasted 1 minute, and is not allowed There are breakdown and flashover. 3.3.6 The far-end crosstalk attenuation between any two pairs of cores of a cable over a length of 500 m shall meet the requirements of Table 8. 3.3.7 The DC resistance difference of the cable should meet the requirements in Table 8. 3.3.8 The inherent attenuation of the cable shall meet the requirements of Table 8. Table 8 Serial number Model Electrical performance Electrical performance requirements Test frequency conversion formula HUYV HUJYV HUYBV HUYAV HUYA32 Conductive wire core straight Current resistance Not more than 45Ω/km Not more than 73Ω/km Not more than 36.7Ω/km DC L All models Core insulation resistance is not less than 3000MΩ · km DC 1000L Working capacitance is not greater than 0.06μF/km 800Hz Withstand AC voltage Between cores Core shield room 1500V 50Hz Crosstalk attenuation is not less than 70dB 800Hz AL = A500- 10lg HUYV HUYBV HUYAV HUYA32 DC resistance difference is not greater than 2% of ring resistance DC HUYV HUJYV HUYBV HUYAV HUYA32 Inherent attenuation Not more than 1.10dB/km Not more than 1.30dB/km Not more than 0.95dB/km 800Hz Note. ①L is the length of the cable, the unit is m. ②AL is the crosstalk attenuation when the cable length is L (m). 3.4 Mine safety requirements 3.4.1 The cable shall be subjected to a fire test. After removing the ignition source, it shall be capable of self-extinguishing. 3.4.2 The surface insulation resistance of the cable shall not be greater than 1 × 109Ω. 3.4.3 The electric induction of each core of the cable over 1km is not more than 800μH. 3.5 Environmental adaptability requirements 3.5.1 The cable shall be subjected to a low temperature static bending test. After the test, there should be no visible cracks or breaks on the cable surface. 3.5.2 HUYV and HUJYV cables should be subjected to the low temperature winding test. 2.2b. After the test, there should be no visible cracks or breaks on the cable surface. 3.5.3 HUYBV, HUYAV and HUYA32 cables should be able to withstand low temperature tensile tests. 3.5.4 The cable shall be subjected to a high temperature test. After the test, there should be no visible cracks or breaks on the cable surface. 3.5.5 The cable shall be subjected to a damp heat test. Immediately after the test, check that the insulation resistance is not less than 100 MΩ · km, and that the line-to-line voltage withstand voltage is 1 500V1min without breakdown, and the surface of the cable is free of wrinkles, pores and cracks. 3.5.6 The cable shall be capable of withstanding the tightness test. 3.5.7 The cable shall be subjected to a low temperature impact test. After the test, the surface of the cable should be free of damage, and the core should be free of open circuits and short circuits. 3.6 The mechanical and thermal aging performance indicators of insulation and sheath shall meet the requirements of Table 9. Table 9 category tensile strength not less than N/mm2 Elongation at break not less than Heat aging temperature time Elongation at break Change rate is not greater than Polyethylene insulation 10 300--- Polyethylene inner sheath 10 350 90 ± 2 4 -35 PVC outer sheath 12.5 150 80 ± 2 7 ± 20 3.7 Cable delivery length requirements 3.7.1 HUYA32 wellbore cable is delivered according to the length required by the user. 3.7.2 The delivery length of cables with specifications of 1 × 2, 2 × 2, and 1 × 4 should not be less than.200m, and the delivery length of cables of other specifications should not be less than 100m. Cables with a length of not less than 50m must not exceed 10% of the delivery volume. The length measurement error should not be greater than ± 0.5%. User pair When there are special requirements for the delivery length, it can be delivered according to the agreement.

4 Test method

4.1 Test conditions Except for the environmental test specified in the relevant clauses in this standard, other tests are performed under the following atmospheric conditions. Ambient temperature. 15 ~ 35 ℃; Relative humidity. 45% ~ 75%; Atmospheric pressure. 86 ~ 106kPa. 4.2 Electrical performance test 4.2.1 The conducting test of the conductive wire core is checked by using an indicator or indicator with a voltage of 36V and below. 4.2.2 The DC resistance of the conductive core of the cable is measured in accordance with GB 3048.4-83 "Test method for the DC resistance of the conductive core of wires and cables" Required. 4.2.3 The insulation resistance of the cable core is measured in accordance with GB 3048.5-83 "Test method for insulation resistance of wire and cable, galvanometer comparison method" Required. 4.2.4 The measurement of cable working capacitance is in accordance with the provisions of GB 5441.2-85 "Communication Cable Test Method-Working Capacitance Test Bridge Method" get on. 4.2.5 The AC voltage withstand test between cores, cores and shields shall be conducted in accordance with GB 3048.8-83 "Test method for AC and AC voltages of electric wires and cables". 4.2.6 The measurement of crosstalk attenuation shall be conducted in accordance with the provisions of GB 5441.6-85 "Communication Cable Test Methods-Crosstalk Attenuation Test Comparison Method". 4.2.7 The measurement of the inherent attenuation of the cable shall be in accordance with the provisions of GB 5441.7-85 "Communication Cable Test Method-Attenuation Constant Test-Open and Short Circuit Method" get on. 4.3 Structural Size and Visual Inspection 4.3.1 The insulation thickness is measured in accordance with the provisions of GB 2951.2-82 "Measurement Method for Insulation Thickness of Wires and Cables". 4.3.2 Sheath thickness measurement shall be carried out according to the provisions of GB 2951.3-82 "Wire and Cable Sheath Thickness Measurement Method". 4.3.3 The outer diameter of the cable is measured in accordance with the provisions of GB 2951.4-82 "Method for measuring outer diameter of wires and cables". 4.3.4 Visual inspection is used for visual inspection. 4.4 Burning test shall be conducted in accordance with the provisions of GB 2951.19-82 "Wire and Cable Burning Test Method". 4.5 The cable surface insulation resistance is in accordance with GB 1410-78 "Solid electrical insulation material insulation resistance, volume resistance and surface resistivity test method The method measures the plate-like test piece, and the measuring electrode diameter is 50 ± 0.1mm. 4.6 The inductance of the cable is measured with an inductance tester with an error not greater than ± 2%. When measuring, connect the ends of any pair of The other end is connected to the tester. 4.7 Cable low temperature static bending test The sample is wound into a circle on a wooden shaft at room temperature.The diameter of the wooden shaft for HUYV and HUJYV cables is equal to 10 times the outer diameter of the cable. 3 turns. The diameter of the wooden shaft for other types of cables is 20 times the outer diameter of the cable. Then put it in a low temperature box of -40 ± 3 ℃ for 2h. Inspection immediately after removal shall comply with the provisions of paragraph 3.5.1 of this standard. 4.8 The low-temperature winding test of cables shall be conducted in accordance with the provisions of GB 2951.12-82 "Low-temperature Winding Test Methods for Wires and Cables". -10 ° C. 4.9 Low-temperature tensile test shall be carried out according to the provisions of GB 2951.13-82 "Low-temperature tensile test method for wire and cable". -10 ° C. 4.10 High temperature test Put the sample flat or rolled into a circle with a diameter of not less than 30 times the outer diameter of the cable and place it in a 100 ± 2 ℃ constant temperature box. After exiting, it was recovered at room temperature for 1 hour, and the sample was unwound continuously on a cylinder with 10 times the outer diameter of the cable for 10 times. Immediately after the test, check the surface of the sheath, Should comply with the provisions of 3.5.4 of this standard. 4.11 Damp heat test in accordance with GB 2423.4-81 "Electrical and Electronic Products Basic Environmental Test Procedure Test Db. Alternating Damp Heat Test Method" It is required to be carried out at a high temperature of 40 ° C for a period of 6 days. 4.12 The low-temperature impact test of cables is conducted in accordance with the provisions of GB 2951.14-82 "Low-temperature impact test methods for wires and cables". -15 ° C. 4.13 Mechanical properties test of insulation and sheath The test of the mechanical properties of insulation shall be carried out according to the provisions of GB 2951.5-82 "Test Methods for Mechanical Properties of Wire and Cable Insulation"; The mechanical performance test is carried out in accordance with the provisions of GB 2951.6-82 "Test Method for Mechanical Properties of Wire and Cable Sheaths". 4.14 The thermal aging performance test of insulation and sheath is in accordance with the provisions of GB 2951.7-82 "Test method for thermal aging of wire and cable air boxes" get on. 4.15 Cable jacket sealing performance test Fill in dry air or nitrogen with a pressure of not less than 30N/cm2 from one end of the cable until the reading on the barometer on the other end of the cable is not lower than 10N/cm2 only. The reading on the barometer should not decrease within 2 hours after stopping inflating the cable. 4.16 Abrasion resistance test for printed signs After wiping gently with a ball of water-absorbent cotton or a piece of cotton for 10 times, the handwriting should still be legible.

5 Inspection rules

5.1 The cable must be subjected to the routine tests, sampling tests and type tests specified in this standard during the shaping and production process. 5.2 Routine tests 5.2.1 Routine tests are carried out by the technical inspection department of the manufacturer. Products can only leave the factory after being qualified, and each batch of products should be accompanied by a product inspection certificate. Pass. 5.2.2 Routine test items shall be carried out in accordance with the provisions of Table 10. 5.3 Sampling test 5.3.1 Sampling method. The batch size of the product is less than 5km, and the sampling must not be less than 3 segments; when the batch size is greater than 5km, every additional 5km, a sample is added. 5.3.2 Sampling test items shall be carried out in accordance with the provisions of Table 10. 5.3.3 If one of the sampling tests is unsatisfactory, another double sample shall be taken from a different circle (pan) to check the unqualified items. If still not Qualified, 100% inspection should be carried out on the unqualified items in this batch of cables. Those who fail are unqualified products. 5.4 Type test 5.4.1 Type tests should be carried out in the following cases. a. When the cable material, structure and main process changes affect the performance of the cable; b. When production is suspended for one year and then resumed; c. At least once every 6 months in batch production. 5.4.2 Sampling method. Three sections are taken from each type of cable. 5.4.3 Type test items shall be carried out in accordance with the provisions of Table 10. 5.4.4 If one of the type tests is unsatisfactory, another double sample shall be taken from a different circle (plate) to check the unqualified item. If still not If it passes, the type test of this type of cable fails. Table 10 Test Item Test Requirements Test Method Test Type

1 Appearance

2 Structure size

3.1 4.3.4 R, T 4.3.1 4.3.2 4.3.3 S, T 3 Conductive wire core electrification test 3.3.1 4.2.1 R, T 4 Conductor core DC resistance 3.3.2 4.2.2 S, T 5 Working capacitance 3.3.4 4.2.4 S, T 6 Crosstalk attenuation 3.3.6 4.2.6 S, T 7 Insulation resistance 3.3.3 4.2.3 S, T 8 AC voltage test 3.3.5 4.2.5 R, T 9 Length measurement 3.7 Meter counter R, T 10 DC resistance difference 3.3.7 4.2.2 And calculations 11 Intrinsic attenuation 3.3.8 4.2.7 T 12 Inductance 3.4.3 4.6 T 13 Surface insulation resistance measurement 3.4.2 4.5 T 14 Abrasion resistance test of printed signs 15 Low temperature static bending test 3.5.1 4.7 T 16 Low temperature impact test 3.5.7 4.12 T 17 Low temperature winding test 3.5.2 4.8 T 18 Low temperature tensile test 3.5.3 4.9 T 19 High temperature test 3.5.4 4.10 T 20 Damp heat test 3.5.5 4.11 T 21 Combustion test 3.4.1 4.4 T 22 Sheath sealing performance test 3.5.6 4.15 T Mechanical properties of insulation and sheath Test and heat aging test 3.6 4.13 4.14 Note. R-routine test; S-sampling test; T --- type test. 6 Marking, packaging, transportation and storage 6.1 Signs 6.1.1 The surface of the jacket of the finished cable should have continuous marks of the manufacturer's name, model and year of production. Recognized, rub-resistant. Should be able to withstand the tests specified in 4.16 of this standard. 6.1.2 The logo may be printed or embossed on the sheath. The distance between the end of one complete sign and the beginning of the next sign should not exceed 500mm. 6.2 Packaging 6.2.1 The cable shall be delivered in coils or disks, and its bending radius shall not be less than the value specified in 2.2b. The ends of the cable must be tight Sealed, looped (disc) cables should be properly packed. 6.2.2 The weight of the cable packed in a loop shall not exceed 50kg. 6.2.3 Cables packed in reels must be arranged neatly around the cable reels. The cable reel shall comply with GB 4005.1-83 "Delivery of wires and cables "Pan Type Dimensions" and GB 4005.2-83 "Technical Requirements for Wire and Cable Delivery Tray". The cable ...

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