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MHT6008-2016 English PDF

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MHT6008-2016: (Navigation aid lighting isolation transformer)
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MH/T 6008-2016English349 Add to Cart 3 days [Need to translate] (Navigation aid lighting isolation transformer) Valid MH/T 6008-2016

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Basic data

Standard ID MH/T 6008-2016 (MH/T6008-2016)
Description (Translated English) (Navigation aid lighting isolation transformer)
Sector / Industry Civil Aviation Industry Standard (Recommended)
Word Count Estimation 14,114
Date of Issue 22/7/2016
Date of Implementation 1/10/2016
Issuing agency(ies) Civil Aviation Administration of China

MHT6008-2016: (Navigation aid lighting isolation transformer)

---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.
Isolation transformer for airport lighting ICS 29.180 K 41 MH Civil Aviation Industry Standard of the People's Republic of China Replace MH/T 6008-1999 Navigation light isolation transformer 2016-07-22 released 2016-10-01 implementation Issued by Civil Aviation Administration of China

Table of contents

Foreword...Ⅱ 1 Scope...1 2 Normative references...1 3 Terms and definitions...1 4 Specifications...2 5 Technical requirements...2 5.1 Composition...2 5.2 Materials...2 5.3 Design and structure...2 5.4 Component requirements...3 5.5 Marking...5 5.6 Manufacturing process...5 6 Test method...5 6.1 Test environment temperature requirements...5 6.2 Visual inspection...5 6.3 Electrical test...5 6.4 Temperature rise test...7 6.5 Impact test...8 7 Inspection rules...8 7.1 Inspection classification...9 7.2 Factory inspection...9 7.3 Type inspection...9 8 Packaging, transportation and storage...9 8.1 Packaging...9 8.2 Transportation...10 8.3 Storage...10

Foreword

This standard was drafted in accordance with the rules given in GB/T 1.1-2009. This standard replaces MH/T 6008-1999 "Navigation aid light isolation transformer". Compared with MH/T 6008-1999, the main technical changes are as follows. -Added "Terms and Definitions" (see Chapter 3); -Modified "Classification and Nomenclature" to "Specifications", adding four specifications of 15 W, 25 W, 50 W, and 300 W (see Chapter 4;.1999) Edition Chapter 3); -Modified the requirements of ambient temperature (see 5.3.3.a;.1999 version 4.3.2.a); --Added the electrical characteristics of the new specifications (see 5.3.4); -Modified the requirements of the shell material (see 5.4.1.3, 5.4.1.4;.1999 version 4.4.1, 5.5); --- Increase the requirements for the internal lead of the transformer lead-out terminal and secondary lead-out line (see 5.4.2); --Increase the requirements for insulating electrical tape or adhesive plastic tape used in the protective cover (see 5.4.2.4); --- Increase the requirement of transformer grounding (see 5.4.3); -Modified the marking requirements and the content contained (see 5.5;.1999 version 4.5); --- Added the test environment temperature requirements in the test method (see 6.1); --- Added the operation method of electrical characteristic test and the schematic diagram of load test (see 6.3.2); --Modified the minimum insulation resistance and maximum leakage current requirements (see 6.3.3.4 Table 3;.1999 Edition 5.2.3 Table 3); --Modified the time of applying DC test voltage in the electric strength test (see 6.3.3.4;.1999 edition 5.2.3.5); -Modified the requirements for the rigidity test of the lead wire of the impact test, and added a schematic diagram (see 6.5;.1999 edition 5.4); -Modified the inspection rules (see Chapter 7, Chapter 6 of the.1999 edition); -Modified the requirements for packaging, transportation and storage (see Chapter 8, Chapter 7 of the.1999 edition). This standard was proposed and interpreted by the Airport Department of the Civil Aviation Administration of China. This standard was approved by the Aircraft Airworthiness Certification 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 Hang'an Airport Equipment Co., Ltd., National Lighting Quality Inspection Center Standard Ministry of Technology, National Optoelectronic Information Product Quality Supervision and Inspection Center. The main drafters of this standard. Liu Yuhong, Shen Jiaqin, Yu Zaidao, Yang Dingguo, Xie Changlin, Xu Xun, Wang Li. The previous version of this standard is. MH/T 6008-1999. Navigation light isolation transformer

1 Scope

This standard specifies the terms and definitions, specifications, technical requirements, test methods, Inspection rules, packaging, transportation and storage. This standard applies to isolation transformers used in series circuits of navigation aids.

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 191 Packaging, storage and transportation pictorial signs GB/T 9969 General Rules for the Use of Industrial Products GB/T 14436 General Rules of Guarantee Documents for Industrial Products MH/T 6009-2016 Navigation aid lighting cable plug and socket

3 Terms and definitions

The following terms and definitions apply to this document. 3.1 Primary current When the transformer is working, the primary input current. 3.2 Secondary current When the transformer is working, the secondary output current. 3.3 Thermoplastic elastomer A material with high strength, high resilience, and rubber-like characteristics that can be injection molded. 3.4 Dotted terminals of the same name Different windings on the same iron core of the transformer, under the action of the same magnetic potential, produce the lead terminals of the same polarity induced electromotive force. 3.5 Current ratio The ratio of the primary current to the secondary current.

4 specifications

The transformer is divided into nine specifications, see Table 1.

5 Technical requirements

5.1 Composition The transformer shall include the primary and secondary windings wound on an iron core, a waterproof housing, and a plug or socket lead from the housing. Primary lead wire and secondary lead wire. 5.2 Material The materials used in the transformer shall meet the relevant requirements of this document. Materials not specified in this document shall be fully applicable to their purpose and comply with the corresponding national Home standard. 5.3 Design and structure 5.3.1 General requirements The design and structure of the transformer should be able to withstand the stress, shock, and vibration during transportation, storage, installation and use. The place of the transformer Some parts should not be loose in use, and electrical connectors should be durable. The transformer should work normally in water or soil environment. The transformer should be able to work normally under arbitrary placement conditions, and the performance meets the requirements of this article Requirements. The shape of the transformer is not limited. 5.3.2 Winding The winding material should be a material with the same or higher conductivity than electrolytic copper. The primary winding and the secondary winding should be insulated from each other and from the iron core. edge. The winding should be tightly wound on the iron core and fixed so that it will not be separated or squeezed close to the shell during the encapsulation process. The winding should be able to Continuously operate under rated current and rated frequency conditions, under rated load, secondary short circuit or open circuit conditions. 5.3.3 Conditions of use The transformer should be operated for a long time in the following environment. a) Ambient temperature. -55 ℃～65 ℃; b) Relative humidity. 0% ～100%; c) Exposure to the air or buried in moist soil containing oils, acids, alkalis and other chemical substances; d) A 5 kV AC voltage with a frequency of 50 Hz can be withstood between the primary winding and the ground. 5.3.4 Electrical characteristics The electrical characteristics of the transformer should meet the requirements of Table 2. Table 2 Electrical characteristics of transformer 5.4 Component requirements 5.4.1 Shell 5.4.1.1 The outer shell of the transformer should be a completely watertight whole, which is directly enclosed on the iron core and winding parts. Thickness of any part of the shell The degree should not be less than 6.5 mm, and there should be no visible cracks, bubbles or small holes on the surface. 5.4.1.2 There should be no sharp corners or sharp edges on the iron core and winding parts to ensure that the outer casing will not be damaged when the transformer falls to the ground or is improperly handled. 5.4.1.3 The shell material should be able to withstand the erosion of acids, alkalis, oils or chemicals commonly found in airport soil. The transformer has a working life of 10 years It should be able to withstand the environmental impact of sunlight (ultraviolet rays, ozone), oil, gasoline, water, deicing fluid, acidic or alkaline soil, etc. The manufacturer should Provide a declaration of conformity and a housing material inspection report issued by a third-party inspection agency (national level). 5.4.1.4 The shell material should be black cross-linked polychloroprene rubber compound or epoxy resin compound, and the same or better performance can also be used Material substitution (such as thermoplastic elastomer TPE or TPV). The Shore hardness of the rubber shell should be (75±10)HA, and the manufacturer should Provide the hardness test report of the shell material. 5.4.1.5 In the process of assembling and encapsulating the transformer, the air in the enclosure should be removed as much as possible. 5.4.1.6 Except for the deformation of the material under pressure, the shell should not be dented. 5.4.1.7 The shape of the shell should be easy to lay flat, and it should be able to fit into a cylindrical space with a height of 255 mm and a diameter of 205 mm. 5.4.1.8 The shell and the lead wire sheath should be firmly and reliably combined and form a waterproof whole. Lift the transformer with a lead wire or When the lead wire is bent or twisted during the test and installation, the shell should not be cracked or damaged. 5.4.1.9 There should be a reinforced area at the junction of the shell and the lead wire, and the thickness of the material should be at least 25% larger than the outer diameter of the lead wire. strengthen The zone and the cable sheath should be well integrated as a whole, and there should be no defects such as bubbles, blisters or cracks. The following two ways can be used to set the enhanced area. -Wrap a single lead wire to form a cone; --Enclose the three lead wires to form a protruding whole. 5.4.2 Transformer lead wire 5.4.2.1 General requirements The transformer shall be provided with a dual-core secondary lead wire and two single-core primary lead wires. The connection between the lead wire and the transformer winding can be crimped Or welding method. One end of the primary winding is H1 and the other end is H2.The end with the same name corresponding to H1 is X1 of the secondary winding, and the end with the same name corresponding to H2 is the secondary X2 of the level winding. When using a crimp connection, a suitable crimp tube should be selected. In the process of encapsulating the shell, ensure that after the operation is completed, Maintain proper spacing. All three lead wires should be led out from one end of the transformer. The length of each lead wire should meet the requirements of 5.4.2.2 and 5.4.2.3. Note. The length of the lead wire is the distance from the joint surface of the end plug or socket to the joint with the shell. 5.4.2.2 Primary lead The end of the H1 primary lead wire should be equipped with a plug that conforms to Style 2 (Figure A.2) in MH/T 6009-2016.Corresponding to H2 primary lead wire The end should be equipped with a socket in line with MH/T 6009-2016 Style 9 (Figure A.9). The primary lead wire should be a copper core cable with a rated voltage not less than 5 kV, a single core, and a total cross-sectional area of not less than 6 mm2. The degree is 60 cm±7.5 cm or the length proposed by the user. 5.4.2.3 Secondary lead wire The end of the secondary lead wire should be equipped with a socket conforming to style 7 (Figure A.7) or style 8 (Figure A.8) in MH/T 6009-2016. Choose style 8 socket. The secondary lead wire should be of rated voltage not less than 600 V, double core, multi-strand total cross-sectional area not less than 2.5 mm2 Flexible cable with a length of 120 cm±7.5 cm or the length proposed by the user. In the secondary lead-out line, X1 corresponds to the large hole (internal lead) of the style 7 (Figure A.7) or style 8 (Figure A.8) socket in MH/T 6009-2016 Red), X2 corresponds to the small hole (inner lead is blue) of the socket of style 7 (Figure A.7) or style 8 (Figure A.8) in MH/T 6009-2016. 5.4.2.4 Protective cover Each lead wire should be equipped with a watertight protective cover. The protective cover should be made of rubber or rubber-like plastic, which can be Plugs or sockets are connected without electrical contacts. When leaving the factory, the joint between the protective cover and the plug or socket should be wrapped with insulating electrical tape or adhesive plastic tape. Insulating electrical tape or stick After the removal of the sexual plastic belt, there must be no residue to prevent dust accumulation or affect the use. 5.4.3 Grounding The iron core should not be grounded and not connected to the primary and secondary circuits. The transformer can be designed to be grounded or ungrounded. When the transformer is grounded, a copper ground should be provided on the transformer shell Terminal. This terminal should be connected to the X1 end of the secondary winding inside the transformer, and can be connected to a copper wire with a cross-sectional area not less than 4 mm2. The setting of the ground terminal should not damage the water tightness of the enclosure. 5.5 Marking The surface of the transformer housing should be molded with clear and permanent product marking information. The marking information should contain at least the following. 5.6 Manufacturing process Transformers and their parts should be produced and processed using perfect technology to ensure that crimping or welding is firm and reliable, and windings are tidy and adequate. The dipping, shell and lead wires are tightly and reliably combined.

6 Test method

6.1 Test environment temperature requirements Unless otherwise specified, perform the following tests and inspections at an ambient temperature of 25 ℃ ± 5 ℃. 6.2 Visual inspection The visual inspection of the transformer should include the following. a) Check whether the shell material inspection report, conformity statement and hardness test report (rubber material shell) provided by the manufacturer are consistent with Meet the requirements of 5.4.1.3 and 5.4.1.4; b) Visually inspect the transformer shell for cracks, bubbles, blisters and other defects, especially whether the junction between the shell and the lead wire is firm; c) Whether the length and specification of the lead wire meet the requirements of 5.4.2.2 and 5.4.2.3; d) Check whether the marking information of the transformer is clear and complete; e) Check whether there are insulating fillers (silicone grease) or debris in the lead-out sockets, and whether the surface of the pins is smooth. Whether the pin is perpendicular to the jack On the joint surface of the shell, whether the plug and socket insertion force is proper; f) Directly apply as much pressure as possible on all parts of the transformer shell by hand, and check whether there are voids under the surface of the transformer shell phenomenon; g) Check whether the protective cover is complete; h) If there is a ground terminal, check whether it can be connected to a 4 mm2 copper wire. 6.3 Electrical test 6.3.1 Test preparation Use an autotransformer to provide a sine wave current whose primary current is the rated value. Prepare three test leads corresponding to the transformer leads line. One end of the test lead wire is suspended, and the other end is equipped with a plug or socket for plugging in the transformer lead wire. When conducting the insulation resistance and dielectric strength tests in 6.3.3, between the transformer lead wires and between the transformer lead wires and the test lead wires Insulation tape is not wrapped at the junction of the plug and socket. 6.3.2 Electrical characteristic test 6.3.2.1 Test conditions Connect the transformer as shown in Figure 1 in a room temperature area with no convection wind. Lay the transformer horizontally on a wooden board at least 30 mm thick. After loading the rated load, run for at least 6 hours until the temperature of the transformer winding reaches the normal operating temperature before the test can be carried out. Winding temperature The measurement can refer to 6.4 temperature rise test method. When calculating the measurement results, the internal resistance and loss of the measuring instrument should be considered, and compensation should be made. The measurement results should be in full compliance with the requirements of Table 2. 6.3.2.2 Current ratio test The primary current is kept at the rated value, and the load resistance in accordance with Table 2 is connected on the secondary. Measure the secondary current of the transformer, the measurement result Should meet the requirements of Table 2. 6.3.2.3 Other electrical characteristics test The primary current is kept at the rated value, and the load resistance specified in Table 2 is connected to the secondary. Measure and calculate transformer efficiency and power factor number. Under secondary short-circuit conditions, measure the secondary short-circuit current. Under the secondary open circuit condition, measure the secondary open circuit voltage. The measurement result should meet The provisions of Table 2. 6.3.3 Insulation resistance and electric strength test 6.3.3.1 Heating The transformer should be equipped with a test lead wire, and run for at least 6 h under the condition of secondary open circuit and primary current as the rated value in room temperature air. 6.3.3.2 Thermal insulation resistance measurement After heating, immediately immerse the grounded transformer with its lead wires, plugs and sockets in water at a temperature of 25 ℃ ± 5 ℃. in During this period, except for the end of the test lead, the transformer lead and the plugs and sockets on the test lead are completely immersed in water. After immersion in water, immediately measure the insulation resistance of each winding and its complete set of wiring. The time interval from the end of the heating cycle to the start of the measurement is not Should exceed 3 min. 6.3.3.3 Cold insulation resistance measurement After immersing the transformer together with all plugs and sockets in room temperature water for at least 12 hours, measure the insulation resistance of each winding and its complete set of wiring. 6.3.3.4 Dielectric strength test Apply a DC test voltage in accordance with Table 3 between each winding and the ground and keep it for 1 min. At this time, the other winding is grounded, and the corresponding The plug and socket are immersed in water (the end of the test lead is suspended). The insulation resistance indicated under the test voltage should not be less than that in Table 3. The lowest insulation resistance value. To verify the zero position and maximum reading of the test instrument, the end of the high-voltage test line should be kept in contact with the water surface and suspended. The meter pointer is passing current After the shock tends to stabilize, it should remain stable and not fluctuate. 6.3.3.5 Test cycle and qualification judgment The transformer shall undergo 20 cycles of cyclic test, and each cycle shall be tested in sequence from 6.3.3.1 to 6.3.3.4.The measurement results shall be Meet the requirements of Table 3. During the test, each plug or socket of the transformer lead should be plugged into a test lead that meets the requirements of 6.3.1.in Before the completion of 20 test cycles, the test lead should not be removed, otherwise the test should be repeated for 20 cycles. 6.4 Temperature rise test The resistance method is used to measure the temperature rise of the transformer. When measuring, the primary winding should pass the rated current, and the secondary winding should be in the rated load, There are three states of short circuit and open circuit. In each state, a double-arm bridge is used to measure the cold resistance and thermal resistance of the transformer windings. According to formula (1) to calculate the transformer Temperature rise. After the transformer has been running continuously for 4 hours, the thermal resistance measurement shall be carried out within 2 minutes of power failure. 6.5 Impact test Drop the transformer freely from a height of 2 m onto a flat concrete floor twice. Try to make a certain bottom angular or most likely at a time The part that caused the core to cut the shell landed first, and another attempt was made to land first on a certain side or the part most likely to cause winding damage. Use the cable clamp on the bracket to clamp each lead wire close to the plug and socket one by one. The clamp should not cause damage to the lead wire. folder There is a sufficient distance between the tool and the ground to ensure that the transformer is in a freely drooping state, and the distance from the shell to the ground is not less than 0.4 m. test During the inspection, the lead wires should be kept sagging, lift the transformer to the position shown in Figure 2, and let go to make the transformer fall freely. The transformer subjected to the above test shall be subjected to an electrical characteristic test according to 6.3.2.The measurement results should meet the requirements of Table 2, and be consistent with the impact test The difference between the measurement results of the previous electrical test is not more than ±1%, otherwise it will be regarded as unqualified. Check whether the junction between the lead wire and the shell Cracks, if there are cracks, it is regarded as unqualified. Figure 2 Lead wire rigidity test

7 Inspection rules

7.1 Inspection classification Transformer inspection is divided into factory inspection and type inspection. 7.2 Factory inspection 7.2.1 Transformers should be inspected one by one after leaving the factory, and the product qualification certificate should be signed after passing the inspection. 7.2.2 The inspection items of the factory inspection are shown in Table 4. Note. "△" refers to the inspection items that should be carried out, and "-" refers to the inspection items not to be carried out. a The factory inspection is only carried out in one of the 20 cycles specified in 6.3.3, and the heating time can be shortened by preheating. 7.2.2.1 If one item in the factory inspection does not meet the requirements, the product is not qualified. 7.3 Type inspection 7.3.1 Type inspection should be carried out in one of the following situations. a) The new transformer is finalized; b) Production of this model has been suspended for more than one year and resumed production; c) The design, process and material changes of the transformer may affect the performance of the transformer; d) There is a big gap between the factory inspection results and the last type inspection results; e) The civil aviation management department proposes equipment compliance inspection requirements. 7.3.2 The inspection items for type inspection are shown in Table 4. 7.3.3 The number of type inspection samples is 4, 3 are complete ungrounded transformers (the lead wire length is standard length), and 1 is Unencapsulated samples (if grounded, a grounded unencapsulated transformer should be provided). 8 Packaging, transportation and storage 8.1 Packaging The product should be packed in a packing box with the following documents. a) Product conformity certificate, which should be compiled in accordance with GB/T 14436; b) Product instruction manual; its content should meet the requirements of GB/T 9969; c) Certificate of conformity, instruction manual, etc. of main accessories; d) The packing list, which should at least indicate. 1) The name of the manufacturer; 2) Product name, model and quantity; 3) Packing date; 4) Order contract number. The product name, model, specification, quantity, manufacturer’s name and ordering contract number should be clearly marked on the outside of the packing box, and be in accordance with the requirements of GB/T 191. Request to set relevant flags. 8.2 Transportation The properly packaged transformer can be transported by any normal means of transportation. 8.3 Storage The transformer should be stored in a dry, well-ventilated place away from heat sources and no corrosive gas, and the storage conditions should be checked regularly.

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