This standard specifies the classification and naming, requirements, test methods, inspection rules, marking, packaging, transportation and storage of increased safety high-voltage cable junction boxes for coal mines. This standard applies to increased safety high-voltage cable junction boxes for coal mines (hereinafter referred to as junction boxes). MT/T 946-2005 Increased safety high-voltage cable junction boxes for coal mines MT/T946-2005 Standard download decompression password: www.bzxz.net

ICS 73.100.99
Preparation number: 15515—2005
Coal Industry Standard of the People's Republic of China
T/T946—2005
Increased safe1y high-voltage cables connecting box for coal mine
Increased safe1y high-voltage cables connecting box for coal mine2005-02-14Promulgated
National Development and Reform Commission
2005-06-01Implementation
Normative reference documents
Classification and naming
Countermeasures
Inspection rules
Marking, packaging, transportation and storage
MT/I946—2D05
MT/T 946-2005
This standard was proposed by the Science and Technology Development Department of the China Coal Industry Association and is managed by the Coal Industry Coal Mine Special Equipment Standardization Technical Committee. This standard was drafted by Huang from the Shanghai Branch of the China Coal Research Institute: Fushun Branch of the China Coal Research Institute participated in the drafting. The main drafters of the standard are Zhu Qikun, Hua Yingshe, An Changtong and Xia Wengang. 1 Scope
Increased safety high-voltage cable junction box for coal mines
MT/T 946—2005
This standard defines the classification, naming, requirements, test methods, inspection specifications, marking, packaging, transportation and storage of increased safety type pressure relief valves for coal mines.
This standard applies to increased safety type two-horsepower jumper boxes for coal mines (hereinafter referred to as jumper plates). 2 Normative references
The following references are used to make references to this standard. For references of the current period, all subsequent revisions (excluding changes) and revisions are not included in the references. However, the parties to the agreement on this standard may discuss whether the latest versions of these documents can be used. For all references without a reference date, the latest versions shall apply to this standard. GB/T191—2 00 Packaging storage and transportation graphic mark (ey150780: 1997) GB/T3223.4—1993 Environmental test procedures for electronic products Test D1: Variable humidity and heat test method (eqv1EC68-2-3.1980)
GB3836.1200 Electrical equipment for explosive gas environments Part 1, General requirements (egIE60079-0, 1998) GB3856.3-2000 Electrical equipment for explosive gas environments Part 3: Increased safety\system TFC60079-7: 1990) G4208—193 Enclosure protection grade IP code) e0TF529198S) GB/T11022—1999 High voltage switchgear and control equipment Common technical requirements of standards (eg F1EC60694: 1996) GB/T13384-1992 General technical conditions for packaging of electromechanical products GB/T16927.1-1997 High voltage monitoring or inspection technology Part 1: General test methods (41FC-1: 55S) MT/T154.2-1996 Methods and management methods for the compilation of product models of electrical equipment for coal mines MT/T661-1997 Technical conditions for the reverse use of electrical equipment for coal mines 3 Classification and naming
3.1 The explosion-proof type of the junction box is the increased safety type (Ex) for coal mines. 3.2 Models and their contents
The model compilation method of the junction box shall be in accordance with the provisions of MI/T154.21996 , and its discharge method is as follows: IH
3.3 Basic parameters
Number of inlet devices (essential number)
Rated voltage: unit volt (V)
Rated current, unit is A (A)
Shunle number (using positive integer system)
Additional support type
-terminal box
3.3.1 Rated voltage, 3.3, 6.0.10.0VMI/T946-—2005
3.3.2 The rated current value is selected from the following teaching values, 59,:00.233,315,400.500.530,8((4. Note: The current state effect will not meet the requirements of the thermal timing, and the performance will not be fully met. 3.3.3 Rated frequency of AC voltage: 50Hz. 3.3.4 The external protection level shall be lower than IP4 specified in GB4208.-1993. 3.3.5 The junction box is planned for long-term use. 4 requirements: The junction box shall be constructed in accordance with the drawings and technical documents approved by the inspection unit designated by the state. 4.1 The explosion-proof test of the explosion-proof structure of the junction box shall be in accordance with the provisions of GB 3831, 1 and 783: The wiring shall be able to perform normally under the following conditions: 9. The operating ambient temperature is -20-~+40℃; the monthly average relative humidity of the weekly air is not more than 55 (+25℃); in an environment without formaldehyde, continuous gas or steam, and in an environment without obvious shaking and severe impact! The pit parking lot, main air intake, main air intake tunnel, and indoor air intake area of ​​gas mines; if the pollution level is level 3:
h) install transformers: or blood.
4.4 The electrical distance and separation between the conductive parts of different potentials in the junction box and the external conductor shall meet the requirements of 4.3 and 4.4 in 3836-2000. 4.5 When the rated voltage of the junction box is 3.3kV, its insulation resistance value shall not be less than 4M9+3.%V after the test. No insulation resistance test is required, only dielectric test is required. 4.6 The rated impulse withstand voltage (electrical impulse sequence transformer) between the phases of the wiring board and between the phase and the shell shall be tested 3 times according to the rated value in the table! There should be no breakdown.
Table 1 Rated impulse withstand voltage (peak value)
Electricity output and other phenomena
Unit is
The power overvoltage test value of the wiring metal shall comply with the provisions of Table 2. The test is for 1 hour, and there is no flash phenomenon. 4.7
Table 2 Power frequency positive test voltage value
Electrical grade
Sand impulse withstand voltage
Unit is
4. The rated short-time withstand (burning stability) current that the line point withstands shall be selected from the following values ​​and shall correspond to the short-time withstand value: 1.6.2.2.5, a.75.1.5, 6.3, 8, 10, 12.5, 16, 20, 25kA. The standard value of the rated short-time withstand duration is 25. If a wider ,4 can select the value of less than 10%, the recommended value is U.5,:3,4.6.
4.9 The wiring panel should be able to withstand the impact of the rated peak current (dynamic) at 2.5V, the rated peak withstand current standard value is 2.5V, and the rated withstand current is MT/T946-2005
4.10 The alternating heat test of the wiring basin shall comply with the provisions of the GH56.12000 Appendix: The test severity level is recommended to be 100. The test cycle is 2d. After the test, it shall comply with the provisions of 4,>,,7 of this standard, and the metal layer shall not be seriously corroded.
4.11 The protection level of the wiring board shall not be lower than the provisions of 1P54 in GB4208-1933. 4.12 The connections within the connection (connectors) shall comply with the requirements of 4.1 of B3836.3200 and be subjected to the specified range test.
4.13 The resistance of the wire in the control box shall not exceed the value specified in Table 3. Table 3 The lifting limit of the wire terminal
Wiring material
Station. Ministry of Maritime Affairs
The () frame or chain (wrapped with twist thickness:
4.14 The connection box and its components shall comply with the provisions of 23.4,3 of GB26.1-2000 for a 20T impact test: the test pressure shall not affect the explosion-proof type of the electrical equipment. 4.15 The electrical relay of the connection box shall comply with the provisions of 5B3933.1-2090H resistance recording I>. 4.16 The cable entry device shall be able to withstand the clamping test specified in Appendix D of GH 3536. —2010. 4.17 The elastic material shall be able to withstand the roughening test specified in Appendix) of GB336.1-200). 4.1 Junction box shell - composed of upper and lower shell, the strength between upper and lower shell shall meet the requirements of GB3836.1-2001.10.
4.19 The grounding pot shall be grounded according to the requirements of GB3836.1-200C. 4.20 The black metal parts of the junction box shall be rust-proof. 4.21 The outer color of the junction box is red, and the inner surface can be painted. 4.22 The allowable maximum voltage of the junction box shall meet the requirements of GB3835-2000. 3, 5 test methods
5. 1T frequency withstand voltage test G/T 11927,Rated voltage test shall be carried out in accordance with the provisions of H/16S27.--1997. 5.2
5.3 Alternating energy heat test shall be carried out in accordance with the provisions of G/T2123.4-153. 5.4 Enclosure protection test shall be carried out in accordance with the provisions of GB48-993. 5.5 Half-joint torsion test shall be carried out in accordance with the provisions of B1826.12553, and opening test shall be carried out in accordance with the provisions of B/T1102219. 5.6
Impact test shall be carried out in accordance with the provisions of F3K3E.1-2355. 5.
Clamping test of lead-in equipment shall be carried out in accordance with the provisions of Appendix I of GB3B86.1-2000. 5.8
5.9 Aging test of rubber products and elastic materials shall be carried out in accordance with the provisions of GB3836.1-000. 5.10 Absolute temperature measurement shall be carried out in accordance with M:T/T 66:--_997 regulations are in violation. 5.11 The inspection of electrical space and electrical connection, solidification, grounding, painting, crack matching, etc. shall be carried out in accordance with GR3836.1-2r:r: GB 38RE. Space and product drawings, documents and measurements shall be carried out 5.12 The thermal stability test shall be carried out in accordance with the provisions of GB/T11C221999: 5.13 The large consumption of the connection box shall be carried out in accordance with the provisions of 6.7 of GB3836.12000 6 Inspection rules
6.1 Inspection classification
MT/T946-2005
The specifications of the junction box are divided into "out-of-line inspection" and type inspection. 6.2 Factory inspection
6.2.1 Factory inspection requirements See Table 4.
C.2.2 Factory inspection items shall be inspected and tested only after the inspection is completed 5.2.3 The factory inspection of this important line is included in the factory inspection. The factory inspection is carried out by the quality inspection department of the production line. The factory can issue the certificate of conformity after the inspection is qualified.
5.3 Type inspection
6.3.1 When any of the following conditions occurs, a strip inspection shall be carried out: a) trial production of new products or old products; b) when the product is not produced, such as when the structure, material, or process has changed, which may affect the product control performance; c) after the product is discontinued for 3 years; d) when the production is resumed; d) when the product is produced normally, the factory shall conduct a strip inspection once; the quality supervision department shall make requirements for the product. 6.3.2 Type inspection items are exempted from Table 4.
6.3.3 Products used for type inspection shall be selected from the qualified production machine, and the number of certified products shall be no less than 2 sets. 6.3.4 All items of single inspection meet the requirements of this standard, and the type inspection of the wiring board is considered to be qualified. Table 4 Inspection Items Inspection Items Increased Voltage Increased Pressure Transmission Specifications Heat Transmission Recommended Parts Distance Electrical Installation Electrical Power Distribution and Distribution Equipment Specifications Impact Withstand Electrical Power Distribution Equipment Specifications Dynamic Heat Transmission Specifications Maximum Allowable Moisture Rotation Protection Structure and Appearance 4.x, 4.4 14.18~4.3 Note: Items that require inspection are listed in Table 4. Marking, Packaging, Transportation and Storage Test Procedures Clear and permanent markings or patterns “F” should be placed on the outside of the wiring panel. 7.2
The safety mark "MA" for coal mine products should be placed on the shell of the junction box in a conspicuous place and should be fixed securely. The factory-made label of the junction box should be placed in a conspicuous place and should be fixed securely. The following contents should be clearly marked on the label: 7.3
a) Product model and name:
Name and system:
European explosion-proof type\Exel\
Protection level:
Protection certificate number:
Safety mark number for coal mine products
Maximum allowable consumption rate,
Factory date or number:Www.bzxZ.net
"Manufacturer name or trademark!"
i" product label number.
7.4 The nameplate shall be made of bronze, copper or stainless steel. MT/T 946-2005
7.5 The packaging of the junction box shall be able to prevent the product from being damaged during transportation, and rainproof measures shall be taken. The packaging requirements shall also comply with the relevant provisions of GB/13384-1992.
7.6 The outer wall of the junction box packaging shall have obvious signs, including the following items: manufacturer name or trademark, product model and name:
size of the box, gross weight, name and address of the consignee:
t) product quantity;
) comply with the provisions of GB/T121-2000, and the words "be careful", "be careful", "adjust", "packing year and month", and "look for signs". 7.7 The following documents and tools supplied with the product shall be packed into the packaging box; packing list!
Product Certificate:
Product Instructions!
d) Special Tools:
.8 The packaging box should not be subjected to strong cracking, vibration and snow attack during the picking process. 7.9 The product should be stored in a warehouse with good ventilation.3
a) Product model and name:
Title and system:
European explosion type\Exel\
Protection level:
Protection certificate number:
Safety mark number for coal mine products
Maximum consumption rate allowed,
Factory date or number:
"Name or trademark!
i" Product label number.
7.4 The nameplate shall be made of bronze, copper or stainless steel, MT/T 9462005
7.5 The packaging of the receiving box shall be able to prevent the product from being damaged during transportation, and rainproof measures shall be taken. The packaging requirements shall also comply with the relevant provisions of GB/13384-1992.
7.6 The outer wall of the junction box packaging shall have obvious signs, including the following items: manufacturer name or trademark, product model and name:
size of the box; gross weight; name and address of the consignee:
t) quantity of products;
) comply with the provisions of GB/T121-2000; "date of packaging" and ... 7.9 The product should be stored in a warehouse with good ventilation.3
a) Product model and name:
Title and system:
European explosion type\Exel\
Protection level:
Protection certificate number:
Safety mark number for coal mine products
Maximum consumption rate allowed,
Factory date or number:
"Name or trademark!
i" Product label number.
7.4 The nameplate shall be made of bronze, copper or stainless steel, MT/T 9462005
7.5 The packaging of the receiving box shall be able to prevent the product from being damaged during transportation, and rainproof measures shall be taken. The packaging requirements shall also comply with the relevant provisions of GB/13384-1992.
7.6 The outer wall of the junction box packaging shall have obvious signs, including the following items: manufacturer name or trademark, product model and name:
size of the box; gross weight; name and address of the consignee:
t) quantity of products;
) comply with the provisions of GB/T121-2000; "date of packaging" and ... 7.9 The product should be stored in a warehouse with good ventilation.
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