Some standard content:
ICS29.120
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JB||tt| |JB/T58772002
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JB/T587791991
2002-12-01
JB/T5877—2002
This standard is based on GB7251.1 1997 "Low Voltage Switchgear Complete Sets Part 1: Type Test and Partial Type Test Complete Sets of Equipment" is a revision of JB/T5877-1991. Compared with JB/T5877-1991, the main changes of this standard are as follows: The writing of the standard has been modified according to the requirements of GB/T1.1-2000 "Standardization Work Guidelines Part 1: Standard Structure and Writing Rules".
The quotation mark shall be corrected as necessary according to the production and revision status. - Newly added regulations on pollution levels, door cutting loads, rated dispersion coefficients, factory inspection, measurement of electrical clearances and creepage distances, etc. The electrical clearances and creepage distances are revised according to GB7251.1-1997, and added In order to meet the requirements of electric power and preventing the expansion of accidents.
This standard replaces JB/T5877--1991.
This standard is proposed by China Machinery Industry Federation. This standard is under the jurisdiction of the Technical Committee for Standardization of Complete Sets of Electrical Transmission Control Equipment. This standard was drafted by Sichuan Electric Co., Ltd. and Beijing Switch Factory, with Shanghai Aitong Electric Co., Ltd. and Chengdu Low Voltage Electrical Appliance Factory participating in the drafting.
The main drafters of this standard: Jiao Anju, Xu Lintong, Li Xiangchun, Zuo Xiaoming, Gu Xueqin, and Tang Hongxia. This standard was first released in 1991.
1 Scope
Low-voltage fixed enclosed complete switchgear
JB/T5877--2002
This standard specifies the low-voltage fixed enclosed complete switchgear (hereinafter referred to as " "Equipment") technical requirements, test methods, inspection rules, markings, instructions for use, packaging, transportation, storage, etc. This standard is applicable to equipment with AC 50Hz or 60Hz rated operating voltage up to 660V for power distribution and motor control, indoor positive use, with a closed structure and fixed components (including plug-in and withdrawable circuit breaker components). 2 Normative reference documents
The provisions in the following documents become provisions of this standard through reference in this standard. For dated reference documents, all subsequent amendments (excluding corrigenda) or revisions do not apply to this standard. However, parties to an agreement based on this standard are encouraged to study whether the latest versions of these documents can be used. . For undated referenced documents, the latest edition applies to this standard. GB/T2681-1981 Color of wires in complete sets of electrical equipment GB/T2682-1981 Colors of indicators and buttons in complete sets of electrical equipment GB4208-1993 Enclosure protection level (IP code) (eqVIEC60529:1989) GB7251.1-1997 Complete sets of low-voltage switches Equipment and control equipment Part 1: Type test and partial type test complete equipment (idtIEC60439-1:1992)
JB/T2436.1—1992
C2805-86)
JB/ T 2436.2-—1994
C2805-86)
Copper crimping terminals for conductors Part 1: Copper crimping terminals for 0.5~6.0mm2 conductors (neqJIS Copper crimping terminals for conductors Part 2: Copper crimping terminals for 10~300mm2 conductors (negJISJB/T3085-1999 Product Packaging and Transportation Regulations for Electric Power Transmission Control Devices 3 Technical Requirements
3.1 Normal use conditions
Conform to this standard The equipment should be able to work normally under the following conditions of use: 3.1.1 The ambient air temperature | . 3.1.2 Atmospheric conditions
The air is clean and the relative humidity does not exceed 50% at a maximum temperature of +40°C. A higher relative humidity is allowed at lower temperatures, such as 90% at +20°C. , but it should be considered that due to temperature changes, moderate condensation may occur occasionally. 3.1.3 Pollution level
The equipment pollution level is level 3
3.1.4 Altitude||tt. ||The altitude of the installation site shall not exceed 2000m
3.2 Special conditions of use
For equipment that does not meet the above normal use conditions or has special use conditions, the user should negotiate with the manufacturer, 3.3 Electrical Parameters
3.3.1 Rated operating voltage
3.3.1.1 Main circuit: AC 220V, 380V, 660V. JB/T5877---2002
3.3.1.2 Auxiliary circuit: || tt||AC: 6V, 12V, 24V, 36V, 42V, 48V. 110V, 127V, 220V, 380V. DC: 6V, 12V, 24V. 36V, 48V, 110V, 220V. 3.3.2 Rated current ||tt| |3.3.2.1 Equipment functional unit rated current: 1A, 1.25A, 1.6A, 2A, 2.5A, 3.15A, 4A: 5A, 6.3A, 8A, 10A, 12.5A, 16A, 20A, 25A, 31.5A, 40A .50A, 63A, 80A, 100A, 160A, 250(200)A, 400A, 630A800A, 1000A, 1250A, 1600A, 2000A. 2500A, 3150A, 4000A, 5000A. 3.3.2.2 Horizontal busbar rated current: 630A, 800A, 1000A, 1250A, 1600A, 2000A, 2500A, 3150A, 4000A5000A.
3.3.2.3 Vertical busbar rated current: 400A, 630A, 800A, 1000A, 1250A, 1600A, 2000A. 3.3.2.4 Busbar rated short-time withstand current: 15kA, 30kA, 50kA, 80kA, 100kA. 3.3.2.5 Busbar rated peak withstand current: 30kA, 63kA, 105kA, 176kA, 220kA. 3.3.3 Rated dispersion coefficient
The rated dispersion coefficient is in accordance with the provisions of 4.7 in GB7251.1-1997. 3.4 Cabinet frame structure
3.4.1 The cabinet frame of the equipment is a self-supporting structure installed vertically on the ground. It can be welded or assembled and connected by profile parts or steel plate bent parts. 3.4.2 The cabinet frame should have sufficient space. Strength and stiffness, solid and durable, able to withstand the mechanical stress, electrical stress and thermal stress generated by the components in the equipment during normal use and short circuit, and consideration should be given to preventing magnetic paths that can cause large eddy current losses. At the same time, the performance of the equipment will not be affected by the hoisting and transportation of the equipment.
3.4.3 The overall dimensions of the cabinet frame should be selected first from the following values: height: 600mm, 800mm, 1000mm, 1200mm, 1400mm, 1600mm, 1800mm, 2000mm, 2200mm, 2400mm. Width: 400mm, 600mm, 800mm, 1000mm, 1200mm+1400mm, 1600mm, 1800mm. Depth: 400mm, 500mm, 600mm, 800mm, 1000mm, 1200mm, 1600mm3.4.4 The protection level of the equipment shell should not be lower than IP20 in GB4208-1993. 3.5 Isolation
3.5.1 The equipment can be divided into several parts by using partitions Compartments, such as: horizontal busbar room, vertical busbar room, functional unit room, cable room, to meet the following requirements:
a) Prevent access to live parts of adjacent functional units: b) Limit the spread of fault arc:| |tt||c) Prevent the passage of foreign solid objects required for protection from one unit of the installation to another. 3.5.2 The openings between compartments should ensure that arcs or free gases generated by fuses and circuit breakers during short circuit breaking do not affect the normal operation of functional units in adjacent compartments.
3.5.3 compartment can be according to GB7251.Selection of typical forms specified in 1-1997. a) Not separated:
b) Bus bar and functional unit separated:
Bus bar and functional unit separated, and all functional units (except their output terminals) are also separated, their output c )
Terminals do not need to be separated from the busbar:
d) The busbar and functional units, all functional units, and the output terminals of functional units are all separated from each other. 3.5.4 The partitions of the compartments can be metal plates or insulating plates. The metal partition should be effectively connected to the protective conductor. 3.5.5 The partitions in the functional unit compartments should be able to withstand the mechanical stress, electric stress and thermal stress that may occur during use, and should not be damaged or permanently deformed.
3.6 Ventilation holes
3.6.1 When designing and installing the ventilation holes on the equipment shell, there should be no arc or molten metal ejected from the ventilation holes under the following circumstances: 2
JB/T5877-2002
a) Normal arcs generated by fuses, circuit breakers, and contactors during operation and short-term arcs generated when disconnecting short-circuit faults; b) Burned electrical components.
3.6.2 If the arc source is close to the ventilation hole, it is required to install a metal arc-starting partition or an arc-blocking insulating partition between the ventilation hole and the possible arc source.
3.6.3 The size and installation of the partition should meet this requirement. Direct some straight lines from any arc burning part through the edge of the partition to the plane where the ventilation hole is located. These straight lines form an area in the plane where the ventilation hole is located. , this area should be no less than 7mm away from the edge of the ventilation hole. 3.6.4 The selected partitions must have sufficient strength and stiffness, and should be able to meet the requirements of 3.5.5. 3.6.5 The setting of ventilation holes must not reduce the protection level of the shell. The neck ventilation holes should be covered with covering panels when necessary. 3.6.6 The ventilation holes opened in the shell should not reduce the strength of the shell. 3.7 Hinge
3.7.1 Door hinges should be made of metal, and the hinges should be firmly fixed to the shell and door. 3.7.2 If steel hinges are used as protective grounding measures, they should be galvanized or chromium plated; if the hinges are connected to the door and shell by spot welding, the coating on the hinge surface cannot be damaged by welding.
3.7.3 A door equipped with hinges should be able to withstand a load four times its own weight (but not less than 10kg), and under normal installation, transportation, and working conditions, the hinges should have no permanent deformation. 3.8 Functional unit
Usually the functional unit can be disassembled only when the main circuit is not powered; when the circuit breaker of the functional unit is withdrawable or plug-in type, it can also be disassembled when the main circuit is powered (but the main switch is disconnected) Functional units can be safely removed or installed directly by hand or with the help of tools. 3.8.1 When the functional unit is in the removed position, the compartment in which it is located should be able to prevent people from coming into contact with live objects. 3.8.2 The same functional unit should be interchangeable, even after a short circuit accident: its interchangeability will not be destroyed. 3.9 Interlock
In order to ensure personal safety during operation procedures and maintenance, the device should be equipped with an interlock mechanism. You can also use measures to strengthen management, such as providing special keys and installing warning signs.
3.9.1 When the equipment has two incoming units, the two incoming units and the mutual interlocking between the incoming unit and the bus unit should be provided according to the system operation needs. The interlocking device can be mechanical. , can also be electrical. 3.9.2 When the main switch of the functional unit is designed to be removed and installed even when powered, the door of the unit and the main switch must be interlocked with each other. The door cannot be opened until the main switch is turned off. When two circuits are installed in one functional unit, the main switch of each circuit must be interlocked with the door. When special needs arise, an unlocking mechanism can be set up so that the door can be opened when the main switch is in the on position. 3.9.3 When taking measures to strengthen management, warning signs should be placed in prominent locations. 3.10 Electrical clearances and creepage distances
3.10.1 The electrical clearances and creepage distances of electrical components within the equipment should comply with the distances specified in the respective relevant standards, and this distance should also be maintained under normal use conditions.
3.10.2 The electrical clearance, creepage distance or impulse withstand voltage of exposed live conductors and terminals in the equipment (for example: busbars, connections between electrical appliances, cable joints) should comply with Table 1 and Table 2 Provisions. Table 1 Minimum electrical clearance in air
Rated impulse withstand voltage Ur
kv
2.5
4
6
8| |tt||12
Non-uniform electric field conditions
1.5
3
5.5
8
14
Electrical Gap mm
Uniform electric field conditions
1.2
1.2
2
3
4.5
Note: Power supply system For the relationship between the nominal voltage and the rated impulse withstand voltage of the equipment, see GB7251.1-1997 Appendix GJB/T5877-2002
rated insulation voltage U
y
250||tt| |400
500
630(690)
800
1000
I
3.2
5||tt ||6.3
8
10
12.5
The minimum value of the creepage distance in Table 2
The long-term creepage distance quotient of the equipment withstanding voltage for a long time|| tt||mm
Material group
a
3.6
5.6
7.1
11
14|| tt||Note: Material groups are classified according to the numerical range of the Comparative Tracking Index (CTI). Material group I
Material group 11
-Material group IIa
Material group Ib
3.11 Temperature rise
600≤CTT|| tt | 3.12 Short circuit protection and short circuit withstand strength
4
6.3
8
10
12.5
16
mb
4
6.3
8
10
3.12.1 Within the rated electrical parameter range, the equipment should be able to withstand the maximum to the thermal stress and electrodynamic stress caused by the rated short-circuit current. The equipment can use circuit breakers, fuses or a combination of both as short-circuit protection appliances. 3.12.2 The relationship between the short-circuit current peak value and the root mean square value: The short-circuit current peak value used to determine the electromotive force intensity (i.e., the first peak value of the short-circuit current including the DC amount) should be obtained by multiplying the short-circuit current root mean square value by the coefficient n , the coefficient n and the corresponding power factor cosα are shown in Table 3.
Table 3 Standard value of coefficient n and corresponding power factor short-circuit current root mean square value
kA
5
10
10≤20||tt ||20≤≤50
50100
cos o
0.7
0.5
0.3
0.25
0.2| |tt||n
1.5
1.7
2.0
2.1
2.2
3.12.3 Selection and selection of equipment short-circuit protection devices The setting should ensure that when a short-circuit fault occurs in any output branch of the equipment, it should be disconnected by the switching device of the branch without affecting other output branches to achieve protection selectivity 3.13 Busbars and insulated conductors ||tt ||3.13.1 General
3.13.1.1 The busbar should be made of copper, copper alloy, aluminum, and aluminum alloy materials, and the insulated conductors should be copper stranded wires. 3.13.1.2 In addition to the current that must be carried by the busbar and insulated conductor cross-sections, the selection is also governed by the following conditions: the mechanical stress endured in the equipment, the number of conductors, the type of insulation, and the type of components. 3.13.1.3 The layout of busbars and insulated conductors should minimize the influence of eddy current losses. 3.13.2 Busbar
3.13.2.1 The processed busbar should have a smooth surface with no obvious trace defects, and there should be no cracks or cracks in the bends. The connections are tight, the contact is good, and the configuration is neat and beautiful. Busbars should take measures to prevent galvanic corrosion. 4
JB/T5877—2002
3.13.2.2 The busbar should be fixed with insulating supports, and the busbar supports should be able to withstand the impact of mechanical stress and thermal stress generated by the rated short-time withstand current and rated peak withstand current of the device. 3.13.2.3 It is allowed to use insulating wrapping, insulating sleeves, sprayed epoxy powder or other insulating materials as the insulating layer of the busbar; but the following requirements should be met:
The insulating material should be self-extinguishing; ||tt ||The insulation of the busbar should be able to withstand the impact of mechanical stress and thermal stress. 3.13.3 Insulated wires
3.13.3.1 The selection of cold crimped terminals in the equipment should be based on the structure of the terminals of the electrical components connected to the conductors. The crimped terminals should be matched with the multi-strand insulated stranded wires and pressed The quality of the connection should comply with the regulations of JB/T2436.1-1992 and JB/T2436.2--1994. 3.13.3.2 Insulated conductors should not be installed close to exposed live parts or close to the edges of parts with sharp corners. They should be fixed on the frame or bracket with wire clips, preferably in wire troughs. 3.13.3.3 In movable places, such as connecting wires across doors or movable installation panels, and auxiliary circuit connectors that are manually plugged in, they should be protected by sleeves, and a certain length of margin should be left. , no mechanical damage may occur due to movement of components. 3.13.3.4 Passband A terminal is connected to only one conductor. The connection of two or more conductors to a terminal is only allowed if the terminal is designed for this purpose. bzxZ.net
3.13.3.5 Wires connected to heating elements (such as tubular resistors) should consider the impact of heating on insulated wires, and appropriate measures should be taken.
3.13.3.6 When insulated wires pass through the wiring holes on the metal plate, a smooth insulating bushing should be installed on the hole to prevent the wire insulation from being worn.
3.13.4 Color and arrangement of busbar insulated conductors 3.13.4.1 The color of busbars and insulated conductors in equipment should comply with the regulations of GB/T2681-1981. Black is recommended: if other colors are selected, GB/T2681 is allowed Colors other than those specified in 1981, but the color of the insulated conductors of each batch of equipment must be consistent. The color of the protective conductor adopts a yellow and green two-color mark. 3.13.4.2 The phase sequence arrangement of the busbars in the equipment (viewed from the front of the equipment) should comply with the provisions of Table 4. Table 4 Phase sequence of busbar arrangement
Category
AC
Neutral line (N)
L1 phase
L2 phase
L3 Phase
neutral protection line (PEN)
protection line (PE)
vertical arrangement
upper
middle
lower|| tt||: bottom
horizontal arrangement
left
middle
right
rightmost
: Note 1: In special cases Below, if the beams are arranged in this phase sequence, it will cause difficulties in busbar preparation, and the requirements in Table 4 need not be followed. Note 2: If the neutral line or neutral protection line is not installed in parallel near the phase line, its position does not need to be as specified in Table 4. 3.13.4.3 The color of the busbar phase sequence can run through the entire length of the busbar, and the color mark can also be used at the obvious position of the busbar. be identified. 3.14 Protection circuit
arrangement before and after
far
middle
near
nearest
3.14.1 The protection circuit of the equipment can be set individually Protective conductors or conductive structural members, or both. It should be able to ensure electrical continuity between the exposed conductive parts of the device and between them and the protective circuit, and its resistance value should be less than or equal to 0.01. 3.14.2 All metal partitions used to isolate live conductors should be effectively grounded. 3.14.3 The equipment frame, the metal casing of the instrument transformer, the metal casing of switching appliances, instruments, relays, and metal manual operating mechanisms should be effectively grounded.
5
JB/T5877—2002
3.14.4 The metal casings of all electrical components are considered to be fully grounded if they are installed on grounded galvanized metal components using metal screws. . Galvanized metal plates and mounting structural parts connected to each other with screws are considered to have protective circuit continuity. Otherwise, measures (such as grounding washers) should be taken to ensure the continuity of the protective circuit. 3.14.5 Setting of separate protective conductors:
3.14.5.1 The cross section of the main protective conductor of the equipment should be selected according to 7.4.3.1.7 in GB7251.1-1997. 3.14.5.2 In order to facilitate the connection of protective conductors and improve reliability, vertical branch protection busbars can be set up in the equipment. The cross-section should be selected according to 7.4.3.1.7 in GB7251.1--1997. The operating current of the protection device and protective conductors and electrical continuity should not be damaged by faults during operation.
3.14.6 For doors, covers, cladding and similar components, if no electrical equipment is installed on them, general metal screw connections or galvanized or tin-plated metal hinge connections are considered to be sufficient to ensure electrical safety. continuity; if electrical equipment with a rated voltage exceeding 42V is installed on it, protective conductors should be used to connect these components to the protective circuit. The cross-sectional area of ??this protective conductor is not less than the cross-sectional area of ??the largest conductor from the power supply to the appliance.
3.14.7 The protective conductor should be able to withstand the mechanical stress experienced during transportation and installation of the equipment and the mechanical stress and thermal stress generated in a single-phase grounding short circuit accident, and its grounding continuity cannot be damaged. 3.15 Anti-corrosion
Unless it is truly anti-corrosion, all metal parts should take anti-corrosion measures. Anti-corrosion measures include: painting, galvanizing or other methods,
3.16 Insulating materials|| tt||The insulating materials used in the equipment should be self-extinguishing or flame retardant. 3.17 Selection and installation of components
3.17.1 Selection of components
3.17.1.1 The rated voltage, rated current, service life, making and breaking capacity, short circuit strength and other parameters of the components should meet the electrical requirements of the equipment Parameter requirements,
3.17.1.2 The components in the equipment must be qualified products produced by manufacturers that have obtained production licenses. For components that have not yet implemented licenses, they are allowed to use qualified products that meet their own relevant standards: components with compulsory certification must have certification marks. 3.17.1.3 When selecting the incoming line switch and the switch for feed or motor control, the coordination of the protection characteristics of each other should be met. 3.17.1.4 It is recommended that the auxiliary circuit of the equipment be isolated from the main circuit by a transformer. The auxiliary circuit should be equipped with a protection device: if the protection device is connected to the main circuit, the short-circuit breaking capacity of the protection device should be coordinated with the protection characteristics of the main circuit protection element. 3.17.1.5 The colors of the indicator lights and buttons in the equipment should be selected according to its purpose and in accordance with the provisions of GBT2682. 3.17.2 Installation of components
3.17.2.1 All components should be installed in accordance with the manufacturer's instructions (usage conditions, arc spacing, arc separation plate movement distance, etc.) 3.17.2.2 The handle of the manual operating switch appliance should It should be installed in an easy-to-operate position, and its center line should generally be no higher than 2m above the foundation surface. The design of its baffle should take measures to avoid arc hazards to the operator. 3.17.2.3 The terminal block for external cable connection should be installed at least 0.2m above the equipment foundation surface, and necessary space should be provided for the connecting cable to facilitate installation, wiring, maintenance and replacement. 3.17.2.4 Components that need to be operated, adjusted and reset inside the equipment should be easily accessible. 3.18 Mechanical and electrical operating performance
The mechanical and electrical assembly of the equipment should meet the design requirements and operate normally. 4 Test methods
4.1 General inspection
4.1.1 The selection and installation of components should comply with the requirements of 3.17. 4.1.2 The selection and arrangement of main and auxiliary circuit busbars and conductor cross sections and colors should comply with the requirements of 3.13. 6 | | tt | | JB/T5877—2002 | The processing of metal protective layers and insulation parts in equipment should comply with the requirements of corresponding standards or technical documents. 4.1.4
4.1.5 The paint layer in the equipment should be firm and even, and there should be no obvious color difference and reflection when observed at a distance of 1m from the equipment. 4.1.6 The overall dimensions and installation dimensions of the equipment should comply with the requirements of drawings, standards and technical documents. 4.1.7 Check the electrical clearance and creepage distance, and their dimensions should comply with the requirements of 3.10. 4.2 Mechanical and electrical operation tests
Equipment needs to undergo mechanical operation and electrical operation tests before leaving the factory to ensure the assembly quality of the equipment, the correctness of the components in the circuit, and the correctness and reliability of the wiring.
4.2.1 Mechanical operation test
All manually operated parts in the equipment, such as the operating handle of the switch, interlocking mechanism, etc., should be subjected to operation tests (factory test is 5 times, type test is 50 times) without any abnormal phenomena. 4.2.2 Electrical operation test
According to the requirements of the main and auxiliary circuit diagrams of the equipment, a simulated action test should be carried out. The test results should meet the design requirements. 4.3 Measurement of electrical clearance and creepage distance
The measurement method of electrical distance is carried out according to GB7251.1-1997 Appendix F, and the measured value should not be less than the specified value of 3.10.
4.4 Temperature rise test
The temperature rise test is carried out in accordance with the provisions of 8.2.1 in GB7251.1-1997. 4.5 Dielectric strength test
4.5.1 The dielectric strength test is to verify whether the insulation performance of each part of the equipment meets the rated insulation grade requirements given by the equipment. The test should be conducted separately according to the rated insulation voltage of each circuit. 4.5.2 During the type test, the test voltage application time should be 1 minute, the test voltage should be a sine wave, and the frequency should be 45Hz ~ 62Hz. 4.5.3 The test should short-circuit (or remove) those electrical components (such as electronic equipment, capacitors, etc.) that cannot withstand this test voltage from the circuit.
4.5.4 The test voltage should be applied:
a) between the live parts of the main circuit and the ground (frame): b) between the phases of the main circuit;
c) generated Between a circuit and an auxiliary circuit that is not directly connected to it: d) Between an auxiliary circuit and the ground
e) Between auxiliary circuits of different voltage levels. 4.5.5 Test voltage value:
For the main circuit and the auxiliary circuit directly connected to the main circuit, the test voltage value is selected according to Table 5. The test voltage value of the auxiliary circuit not directly connected to the main circuit is selected according to Table 6. 4.5.6 For shells, partitions, doors, etc. made of insulating materials, a dielectric strength test should be conducted between the surface covered with metal foil and the exposed live parts close to the shell or partition, door openings and seams, and the test voltage value It should be 1.5 times that of Table 5. Table 5 Test voltage values ??of main circuit and auxiliary circuit directly connected to the main circuit Rated insulation voltage UV
U≤60
60≤300
300U≤690
690
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