This standard specifies the definition, model, classification, technical requirements, test methods, inspection rules and marking, packaging, transportation, etc. of fire-resistant busbar trunk system (fire-resistant busbar duct). JB/T 10327-2002 Fire-resistant busbar trunk system (fire-resistant busbar duct) JB/T10327-2002 Standard download decompression password: www.bzxz.net

ICS29.120
2002-07-16
JB/T103272002
2002-12-01
JB/T10327—2002
This standard is formulated based on GB7251.1-1997 "Low-voltage complete switchgear and control equipment Part 1: Type test and partial type test complete equipment 5 and GB7251.2-1997 "Low-voltage complete switchgear and control equipment Part 2: Special requirements for busbar trunk system (busbar duct)".
This standard was proposed by the China Machinery Industry Federation. This standard is under the jurisdiction of the Electric Drive Complete Control Equipment Standardization Technical Committee. The responsible drafting units of this standard are: Tianjin Electric Drive Design Institute, Beijing Electric! 、Beijing Third Switch Factory、Shanghai Weirong Electric (Group) Company、Beijing Jingan Xingda Electromechanical Equipment Company、Shanghai Jingcheng Electric Complete Plant、Tianshui Great Wall Control Electric Factory. The main drafters of this standard: Yang Zhanyuan、Ou Huian、Wu Zhongjie、Ji Fuyi、Zhang Haiming、Chen Zhanping、Tao Yuanguo1 Scope
Fire-resistant busbar trunk system
(fire-resistant busbar duct)
JB/T10327-2002
This standard applies to busbars with rated voltage AC up to 1000V (1140V), frequency 50Hz or 60.Hz, and rated current up to 5000A. The special requirements of various types of busbar products should be supplemented in the corresponding product standards. This standard specifies the definition of fire-resistant busbar trunking system (fire-resistant busbar duct) (hereinafter referred to as busbar duct): model, classification, technical requirements, test methods, inspection rules and marking, packaging, transportation, etc. 2 Normative References
The clauses in the following documents become the clauses of this standard through the use of this standard. For any referenced document with a date, all subsequent amendments (excluding errata) or revisions are not applicable to this standard: However, the parties who reach an agreement based on this standard are encouraged to confirm whether the latest versions of these documents can be used. For any referenced document without a date, its latest version is not applicable to this standard. GB/T2423.4—1993 Basic environmental test procedures for electric and electronic products Test Db: Cyclic damp heat test method (eqEC60068-2-30:1980)
GB4208—1993 Enclosure protection grade (IP code) (e9V1EC60529:1989) GB/T5169.10
1997 Fire hazard test for electric and electronic products Glow-wire test method - General rules (let tIFC60695-2-1/0:19943
GB/T 5169.11 ---1997 Fire hazard test for electric and electronic products - Glow-wire test and guidelines for finished products (idr 1EC6 (0695-2-1/0: 1994)
GB5585.2-1985 Copper, lead and alloy busbars for electrical use Part 2: Copper busbars (neq1EC60I05: 1958) GB7251.1-1997 Low-voltage switchgear and controlgear Part 1: Type test and part type test complete equipment (idt IEC 60439-1: 1992)
GB 7251.2-1997 Low-voltage switchgear and controlgear Part 2: Particular requirements for busbar T-bar systems (busbar ducts) (idt EC 60439-2: 1987)
Fire resistance test methods for building components (neqISO/FDIS 834-1:199 (E)) GBT9978--1999
JB/T3085—1999www.bzxz.net
Product packaging and transportation regulations for electric drive control devices JB/T3752.1-1999 Method for compiling product models of low-voltage complete switchgear and control equipment Part 1: Low-voltage complete switchgear
3 Terms and definitions, models
3.1 Terms and definitions
The following terms and definitions apply to this standard. 3.1.1
Busbar trunkingfireresistantunit A busbar trunkingfireresistantunit that has a certain fire resistance at a specified time and temperature and has undergone comprehensive type testing. The busbar trunking consists of the following units:
With or without tapping devices Busbar trunk unit: variable capacity unit, expansion unit, phase change unit, bending unit, feeding unit: JB/T10327-2002
- tapping unit,
busbar trunk unit busbartrunkingunit A unit of the busbar trunk system, which is composed of busbar, busbar support and insulation parts, casing, some fixings and connectors connected to other units. It may have a tapping device or not. Note: Busbar trunk units have different geometric shapes, such as straight, I-shaped, T-shaped and X-shaped. 3.1.3
busbar trunk feeding unit busbartrunkingfeedcrunit The busbar trunk feeding unit is composed of various busbar trunk units without tapping devices (plug sockets) and is used as a busbar trunk unit for any incoming line unit. The unit may or may not require the power supply to be disconnected when connected to the power supply. 3.1.4
Busbar trunking unit with tap-off facilities is a busbar trunking unit prefabricated by the manufacturer and capable of installing tap-offs at one or more points. The connection between the tap-off unit and the busbar trunking unit may or may not require the busbar system to be disconnected from the power supply. 3.1.5
Straight length type busbar trunking unit is a busbar trunking unit in the shape of a straight line.
L-shaped busbar trunking unit is a busbar trunking unit in the shape of a right-angle bend. 3.1.7
T-shaped busbar trunking unit is a busbar trunking unit in the shape of a T, which can be connected to other busbar trunking units in three directions. 3.1.8
X-shaped (cross-shaped) busbar trunking unit Xtypebusbartrunkingunit is an X-shaped (cross-shaped) busbar trunking unit that can be connected to other busbar T-line units in four directions. 3.1.9
Z-shaped busbar trunking unit Ztypebusbartrunkingunit is a busbar trunking unit that moves parallel to the Z shape on the busbar trunk. 3.1.10
Top-off unit
An output device used to tap off power from a busbar trunk unit with a tapping device (see 3.1.3). 3.t.11
Busbar trunk adapter unit: A busbar trunk unit used to connect two units of different models or different rated currents in the same system. 3.1.12
Busbar phase change unit: A busbar 1-line unit used to change the corresponding positions of phase conductors to balance the reactance or change the arrangement of the phases. 3.1.13
End cover plate
A device for terminating and closing the terminal of the bus duct. 3.1.14
Air fire-resistant bus duct
JB/T103272002
The busbar is supported and separated by a support made of heat-resistant insulating material, and is insulated by air medium and has fire-resistant performance.
Dense fire-resistant busbar
The busbar is separated by heat-resistant insulating material, placed close to the channel body, and has fire-resistant performance. 3.2 Model
The model of the bus duct shall comply with the provisions of JB/T3752.1. 4 Classification
According to the insulation structure, it is divided into air fire-resistant bus duct and dense fire-resistant bus duct. 5 Technical requirements
5.1 Conditions of use
5.1.1 In addition to being applicable to the positive use conditions in 6.1 of GB7251.2-1997, the fire-resistant bus duct should also be considered to work in humid environments and special use conditions with fire hazards in accordance with the requirements of 6.5:6.12. 5.1.2 The use conditions not covered in this standard shall be agreed upon by the user and the manufacturer. 5.2 Overvoltage category
Based on the use conditions in the power system, the busbar products can be designed with overvoltage categories II and Class, which the manufacturer shall provide in the instruction manual.
5.3 Rated parameters
5.3.1 Rated current (In)
The rated current value of the bus duct shall be selected from the standard values ​​given in Table 1 5.3.2 Rated working voltage (U.)
The rated working voltage of the bus duct shall be 380V660Y, 1000V (1140V), Table 1 Rated current value (RMS value)
Unit: A
5.3.3 Rated frequency
The rated frequency is 50Hz or 60Hz.
5.3.4 Rated insulation voltage (U)
The rated insulation voltage of the bus duct is a characterization of its insulation specified (long-term) withstand capability, and the rated insulation voltage shall not be lower than the rated working voltage of the circuit.
5.3.5 Rated short-time withstand current (Icw) The rated short-time withstand current of the bus duct refers to the current (RMS value) that the bus circuit can withstand within 1sH (unless otherwise specified by the manufacturer) under the specified test conditions. Its value is shown in Table 2. Table 2
Rated short-time withstand current (RMS value) Unit: kA
Note: The numbers in brackets should not be used as much as possible. (7),
JB/T10327--2002
5.3.6 Rated peak withstand current (fm)
The rated peak withstand current of the busbar trunking refers to the current peak value that the busbar trunking can withstand under the specified test conditions, and its chain should be the product of the rated short-time withstand current and the coefficient in Table 4. 5.4 Performance requirements
5.4.1 Temperature rise
5.4.1.1 Temperature rise under non-fire conditions
The busbar trunking shall be tested in accordance with 6.4, and the temperature rise of each part shall not exceed the provisions of Table 3. 5.4.1,2 Temperature of conductors under fire conditions After the fire resistance test reaches the specified time, the measured temperature of the conductors shall be less than 250℃. Note: Its fire resistance time is divided into 30min, 45min, 60min, 120min, 180min, 240min5.4.2 Protection against electric shock
5.4.2.1 Protection against direct electric shock
The protection requirements of bus duct against direct electric shock shall comply with the relevant provisions of 7.4.2 in GB72.51.1-1997. 5.4.2.2 Protection against indirect contact
The protection requirements of bus duct against indirect contact shall comply with the relevant provisions of 7.4.3 in GB7251.1-1997. 5.4.2.3 Grounding terminal
The bus trunk unit shall have a grounding terminal and a solid grounding mark. The grounding terminal shall be made of a material with good conductivity and installed in an easily accessible place. Terminals for PEN conductors shall be marked with PEN. The connection resistance between any uncoated point on the busbar unit casing and the grounding terminal should be low enough and should not exceed 0.1Ω. Table 3 Temperature rise limit
Busbar parts
Terminals for connecting external insulated conductors
Plug-in contacts on busbar and fixed connections with busbar Copper tin-copper (or copper surface specially treated) Aluminum tin Aluminum tin
Copper chain silver-copper silver-copper
Lead chain copper copper plated pot
Steel-copper
Touchable shell and track
Gold mesh surface
Insulating material surface
Unless otherwise specified, the temperature rise of the shell surface of bus ducts that can be approached but not touched during normal operation can be increased. The gold surface can be increased by 25K, and the insulating surface can be increased by 15K.
5.4.3 Short-circuit strength (capacity to carry short-circuit current) The bus duct should be able to withstand the thermal stress and electromotive stress generated by the specified rated short-time withstand current and rated peak withstand current. The rated peak withstand current shall be obtained by multiplying the coefficient n by the root mean square value of the rated short-time withstand current. The standard value of the coefficient n and the corresponding power factor are shown in Table 4.
5.4.4 Resistance, reactance and impedance values
The resistance, reactance and impedance values ​​of bus duct products shall be given in the product manual or other technical data of the manufacturer and shall comply with the requirements of 4.10 in GB7251.2-1997. 4
Table 4 Standard value of coefficient n and corresponding power factor short-time withstand current ew root mean square value kA
5≤≤10
10l≤20
1ew>50
5.4.5 Insulation resistance
JB/T 10327-2002
When tested according to 6.8, the insulation resistance of the circuit to ground nominal voltage shall not be less than 1000V. The insulation resistance value of each unit (3m long) of the bus duct shall be equal to 20M2.
5.4.6 Dielectric strength
5.4.6.1 When the manufacturer of the bus duct indicates the rated impulse withstand voltage of the circuit, it shall meet the requirements of 7.1.2.3.17.1.2.3.7 in GB7251.1-1997, and the circuit shall meet the dielectric strength verification specified in 8.2.2.6 of GB7251.1-1997. 5.4.6.2 When the manufacturer of the bus duct does not indicate the rated impulse withstand voltage of the circuit, the requirements are as follows: Under normal use conditions, the bus duct shall be able to withstand the test voltage given in Table 5 for 5s between each bus and between live parts and exposed live parts. For dense fire-resistant bus ducts, the test voltage between phases and between phases and the shell shall be 1.5 times that in Table 5. Table 5 Power frequency withstand voltage test value
Unit: V
Rated insulation voltage mountain
3000≤690
690≤0=800
8001000
1000-0,≤1200
Note: The busbar condition required by 5.4.6.2 cannot verify the insulation coordination requirements. 5.4.7 Water spray resistance
Test voltage (RMS value)
The water spray resistance of the bus duct shall be verified according to 6.11 and can pass the dielectric test of 50% of the power frequency voltage value specified by the product. The voltage is applied for [s, and no breakdown or discharge phenomenon shall occur. 5.4.8 Fire resistance performance
5.4.8.1 Verification of the ability of insulating materials to withstand abnormal heat When tested according to 6.12.1, there should be: no obvious flame and no special afterglow. a)
b) Remove the glowing wire, and the flame and afterglow disappear within 30s. 5.4.8.2 The fire resistance test of bus duct shall meet the following requirements: Under the specified time and temperature, the temperature of the conductor of the bus duct shall not exceed 250℃. a)
After the fire resistance test in 6.12.2, the current-carrying conductor shall not be short-circuited, and the insulation resistance value of the bus duct shall not be less than 0.5M0, b)
and pass the withstand voltage test.
JB/T103272002
5.4.8.3 When the bus duct passes through the building components, the gaps around the shell shall be blocked to prevent the spread of fire. The specific requirements are given in the product manual.
5.5 Structural requirements
5.5,1 General
The bus duct shall be designed according to the low-voltage complete switchgear and control equipment (TTA) for type testing. The structure of the bus duct shall be safe and reliable, easy to install and maintain. At the same time, it shall be made of materials that can withstand the mechanical, electrical and thermal stresses specified in this standard and meet the fire resistance requirements. 5.5.1.1 Mechanical load
The mechanical load of the bus duct shall meet the requirements of 7.1.1.1 to 7.1.1.3 in GB7251.2-1997. 5.5.1.2 Busbar trunk unit
Busbar trunk unit needs to separate the busbar with insulating material with certain heat resistance or support it with insulating material, and seal it with fire-resistant material and install it in the shell. The weak protection of the outer line store sauce contains 54 requirements: 5.5.1.3 Busbar connection
When connecting busbar trunk units, the connection of the busbar must be natural and cannot produce mechanical stress: the used sex and gasket should be made of steel or copper alloy products with sufficient strength of electroplating layer, and the protection level of the connection should meet the requirements of 5.5.4, and meet the requirements of 5.4.7 and 5.4.8.
5.5.1.4 Distribution box (feeder box)
Distribution box is divided into the following types according to its use: a) Directly connected to the cable:
b) Built-in circuit breaker:
c) Built-in knife switch.
The structure of the junction box shall meet the following requirements: a) The mechanical connection between the branch line and the busbar trunk unit shall be firm and the electrical contact shall be good; b) The connection between the junction box and the busbar trunk unit shall be waterproof and fire-resistant; meet the specified anti-expansion level; the operation of the junction box shall be flexible and reliable;
The installation of the electrical components selected for the junction box shall be firm and reliable and meet its own product standards; d
e) Different junction boxes shall have different warning signs. 5.5.2 Materials
5.5.2.1 Shell
The selection of the material of the busbar duct shell shall meet the requirements of 5.5.1.1. The interconnected parts of the shell can be connected by welding or bolts, but the electrical continuity of the bolted parts must be ensured. The fasteners used should have a good coating, the coating should be uniform, neat and beautiful: no defects such as blistering and cracks.
5.5.2.2 Conductors
The materials of the conductors should meet the requirements of GB5585.2. 5.5.2.3 Insulating and refractory materials
a) The conductor support should be made of flame-retardant, heat-resistant, moisture-resistant materials with sufficient mechanical strength. b) The insulating materials should be low-smoke and low-toxic materials with sufficient insulation, heat resistance and aging resistance. c) The selection of refractory and heat-insulating materials should meet the requirements of 5.4.8.2 (should be selected according to the requirements of fire resistance time and temperature) 5.5.3 Electrical inter- and creepage distances
The electrical inter- and creepage distances between the exposed live conductors of different polarities in the bus duct and between them and the shell should not be less than the requirements of Table 6.
5.5.4 Shell protection grade
The bus duct shell protection grade shall not be lower than the IP44 requirement specified in GB4208, 6
Rated insulation voltage
60 ≤0300
300 U= 690
690U：800
800 0, 1000
10001200
Test method
General inspection
Table 6, electrical clearance, creepage distance
Electrical clearance mm
Check whether the nameplate and mark are installed correctly and firmly, and shall comply with the provisions of 8.1. ay
JB/T 10327—2002
Creep distance
Check the fire-resistant structure facilities. The coating and shell spraying shall meet the requirements of 5.5.2.1 and 5.5.2.3. b)
Check whether the fasteners are complete and tightened.
6.2 Protection circuit continuity test
Verify with a resistance measuring instrument. The instrument current is at least 10A (AC or DC). Measure the resistance value between the grounding terminal and any point of the bus duct shell to determine the continuity of the protection circuit. The tested point should have no non-conductive covering layer and meet the requirements of 5.4.2.3. 6.3 Mechanical load test
Perform in accordance with 8.2.10.1-8.2.10.4 of GB7251.2-1997 6.4 Temperature rise test
The temperature rise test under non-fire conditions shall be carried out in accordance with 8.2.1 of GB7251.1-1997, and the temperature rise test under fire conditions shall be carried out in accordance with 6.12.2. The test results shall meet the requirements of 5.4.1.1 temperature rise value and 5.4.1.2 temperature value respectively. 6.5 Damp heat test of insulation parts
It shall be carried out in accordance with the Db alternating damp heat test of GB/T2423.4, and its severity is high temperature + 40℃: 6 cycles test. The T-frequency withstand voltage value of the test product shall be 80% of that in Table 5 for 1min. There shall be no breakdown and flashover. 6.6 Short circuit strength test
It shall be carried out in accordance with 8.2.3 and 8.2.4.2 of GB7251.2-1997. 6.7
Verification of resistance, reactance and impedance
The average value of resistance, reactance and impedance (see 4.10 of GB7251.2-1997) shall be determined on the leakage rise test prototype, including at least 100 contacts. For an example of calculation based on the measured values, see Appendix GR7251.2-1997. 6.8 Insulation resistance verification
The insulation resistance of the bus duct shall be measured under non-fire conditions. The measurement location shall be between each phase of the bus duct and between the phase conductor and the grounding terminal. The insulation resistance shall meet the requirements of 5.4.5. The voltage level of the instrument for measuring insulation resistance shall be 500V. 6.9 Dielectric strength test
The dielectric strength test of the bus duct shall be carried out in accordance with 5.4.6. During the impulse voltage test, there shall be no destructive effect. During the power frequency withstand voltage test, if there is no breakdown or discharge phenomenon, the test is passed. The factory test shall be carried out in accordance with 5.4.6.2, but the test voltage shall be applied for 1s. 6.10 Verification of electrical clearance and creepage distance
According to 8.2.5 of GB7251.1~-1997. It shall comply with the requirements of Table 6 of 5.5.3 and 17.12 of GB7251.1·1997.7
JB/T10327—2002
6.11 Verify the protection level of the outer wall
Test according to GB4208 and shall comply with the requirements of 5.5.4. The bus duct used for this test is required to have a connection point. During the test, both ends of the bus duct shall be blocked.
6.12 Fire resistance test
6.12.1 The test of the insulation component to withstand abnormal heat shall be carried out according to Chapters 4 to 10 of GB/T5169.10—1997 and GB/T5169.11—1997, using the glow wire method. For different insulation components, the temperature at the top of the glow wire and the duration of application on the test product are shown in Table 7. After the test, it shall comply with the requirements of 5.4.8.1. Table 7 Parameters of glow-wire test method
Insulating material
In contact with live parts
Not in contact with live parts (e.g. casing, interlayer) 6.12.2 Fire resistance test
Temperature of top of glow-wire
Test duration S
a) The bus duct for the test is required to be at least 6m in length. There is a connection point in the middle of the bus duct. During the test, both ends of the bus duct should be sealed with heat-resistant materials:
b) The water bearing spacing for the test bus is required to be 2m. e) The effective length of the heating furnace should be more than 3m. d) Heating method for fire resistance test: Install the bus duct provided for test in the heating furnace (see Figure 2), and follow the heating method specified in 5.1.15.1.2 of GB/T9978-1999. The standard curve of heating time-overflow is shown in Figure 1. e) The temperature in the furnace is measured by a thermocouple with a wire diameter of 0.75mml1.00mm. After heating, test according to the following procedures. 1) Measure the temperature of the conductor, which should meet the requirements of 5,4.1.2. 2) Use a 500V insulation resistance meter to measure the insulation resistance between the conductors and the insulation resistance of each phase conductor to the shell. The value is not less than 0.5M
3) The bus duct can withstand the power frequency of 1500V and 5s without breakdown and flashover. n
30609012015018021024027030033036 time rmin
Figure time-temperature standard curve
The values ​​of the time-temperature relationship in Figure 1 are shown in Table 8. Table 8 Time-temperature relationship
T-Ta ℃
7 Inspection rules
7.1 Inspection classification
Linear unit
Female fertilization joint
Linear unit
Figure 2 Schematic diagram of fire resistance test
The inspection of bus duct is divided into type test and factory inspection, 7.2 Type test
JB/T 10327—2002
Type test is a comprehensive assessment of bus duct parameters and performance: that is, a comprehensive inspection of the technical requirements in the standard. The length of the test sample should be no less than 6m, with at least one connection point. Type test should be carried out in the following cases: When new products or old products are transferred to other factories for production: When there are major changes in product structure, materials, and processes, which may affect product performance. b
Type test rules
a) Pass factory inspection.
Each test item can be carried out on different samples of the same type. b
The type test of the bus duct is considered to be qualified only when all test items are qualified. Otherwise, the reasons should be analyzed, technical measures should be taken, and even the design, process, and tooling should be improved and re-tested until the type test is qualified. Type test items
Type test rules include the following contents, and k) and 1) tests are carried out after a)~i) tests. a) Inspection (see 6.1):
Protective circuit continuity test (see 6.2): ​​Mechanical load test (see 6.3):
Temperature rise test (see 6.4):
Wet heat test on insulating parts (see 6.5): Short circuit strength test (see 6.6):
Verification of resistance, reactance and impedance (see 6.7):o
JB/T10327—2002
Verification of insulation resistance (see 6.8):
Dielectric strength test (see 6.9):
Verification of electrical distances (see 6.10)j)
Verification of degree of protection of enclosure (see 6.11)k
Fire resistance test (see 6.12)
Note: If the manufacturer provides a valid and qualified test report that meets the requirements of 6.5, item e) may be exempted from the test. 7.3 Factory Inspection
Factory inspection is a test that should be carried out before the cable tray is shipped to verify the defects of materials, workmanship, assembly, etc. 7.3.1 Rules for delivery inspection
The bus duct shall be inspected before delivery by the factory. It can be considered qualified only when all the specified inspection items are passed. If the test fails, it can be reworked and retested. If the retest is passed, it can still be considered qualified, otherwise it is unqualified. 7.3.2 Factory inspection items
a) General inspection (see 6.1):
Protection circuit continuity test (see 6.2): ​​h)
Verification of insulation resistance (see 6.8):
Dielectric strength test (see 6.9):
Verification of electrical clearance and electrical distance (see 6,10). e
8 Marking, packaging and transportation
8.1 Marking
8.1.1 Nameplate
Each unit of the bus duct should be equipped with a nameplate and installed in a conspicuous place. The following items a) ~ j) should be given on the nameplate, and the contents of items k) and q) can be given on the nameplate or in relevant documents. a)
Manufacturer name or trademark:
Product model and name:
Manufacture year and month;
Factory delivery No.:
Rated current:
Rated working voltage:
Rated frequency:
Protection level;
Fire-resistance time;
Standard code and name:
Usage conditions:
Rated insulation voltage:
Grounding type of the designed system;
Overall dimensions and installation dimensions:
Average resistance and reactance value:
Weight:
Short-circuit strength.
8.1.2 Marking
Obvious grounding markings shall be set at the grounding of the bus duct: a)
b) Set a period-distinct bus phase sequence marking at the end of the bus duct unit; 10
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