JB/T 6751-1993 Explosion-proof electromagnetic starter for factory use
Some standard content:
Subject content and scope of application
Machinery Industry Standard of the People's Republic of China
Explosion-proof electromagnetic starter for factory use
JB6751-93
This standard specifies the product classification, basic parameters, technical requirements, test methods, inspection rules, marking, packaging, transportation and storage of explosion-proof electromagnetic starters for factory use (hereinafter referred to as starters). This standard applies to the design, manufacture and inspection of starters. The starter is used in environments containing explosive gases and corrosive media to start, stop or reverse squirrel cage asynchronous motors. 2 Reference standards
National standards
GB2900.18
GB2900.35
GB/T13384
JB3284
JB4262
JB4324
JB4375
Test A: Low temperature test method
Basic environmental test procedures for electrical and electronic productsBasic environmental test procedures for electrical and electronic productsBasic test methods for low-voltage electrical appliances
Test of explosion-proof electrical equipment for explosive gas environmentsDb: Alternating damp heat test method
General requirements
Flameproof electrical equipment "d"
Explosion-proof electrical equipment for explosive gas environmentsExplosion-proof electrical equipment for explosive gas environmentsIncreased safety electrical equipment "."Explosion-proof electrical equipment for explosive gas environments Safety circuits and electrical equipment "" Protection level of low-voltage electrical enclosures
Technical requirements for tropical low-voltage electrical appliances
Electrical terminologyBasic terminology
Electrical terminology for low-voltage electromechanical contactors and motor startersLow-voltage electrical appliances
Electrical terminology
Explosion-proof electrical equipment for explosive gas environmentsGeneral technical conditions for packaging of electromechanical products
Basic environmental conditions and test methods for transportation and storage of motor and electrical productsRubber-sheathed cable entry devices for explosion-proof electrical appliances
Test methods for chemical gas corrosion of electrical productsEnvironmental conditions for use of electrical products in outdoor and indoor corrosive locations3 Terms, symbols, and codes
3.1 Terms
All terms and terms in this standard comply with the relevant terms and terms in GB2900.1, GB2900.18, and GL2900.35. 3.2. Symbols
The symbols used in this standard are as follows:
U. Rated working voltage,
U; Rated insulation voltage:
U, power supply voltage after disconnection;
U power supply voltage before connection;
Approved by the Ministry of Machinery Industry on 1993-08-21
Field implemented on 1993-10-01
U. Rated control power supply voltage;
LRated working current;
I connection current;
L. Breaking current;
Ia agreed heating current;
cosp power factor;
f oscillation frequency;
"over-oscillation coefficient;
IP enclosure protection grade;
P steady-state power consumption (DC electromagnet); AC alternating current;
DC direct current;
JB6751-93
Ta.s the time required for the DC current to rise from zero to 95% of the steady-state value in ms. 3.3 Code
Category codes used in this standard:
AC-3 is used for starting and breaking of double-pet asynchronous motors during operation; it is used for starting, reverse braking or reverse operation, and inching of squirrel-cage asynchronous motors; AC-4
control Control AC electromagnet load;
Control electromagnet load with capacity (closed state) not more than 72VA; Control electromagnet load with capacity (closed state) greater than 72VA; AC15
Control DC electromagnet load;bzxZ.net
DC--14
Control DC electromagnet load with economic resistance in the circuit. Product classification and basic parameters
Product classification
According to the place of use:
Indoor use,
Outdoor use.
According to the anti-corrosion performance:
Anti-light corrosion;
Anti-medium corrosion;
Anti-heavy corrosion.
According to the purpose:
Reversible;
Irreversible. ||tt| |According to the arc extinguishing medium:
Air type:
Vacuum type.
According to the explosion-proof type:
Flameproof type,
Compound type (a combination of flameproof type, increased safety type and intrinsic safety type). 4.2 Basic parameters
Standard frequency of AC power supply: 50Hz.
4.2.2 Rated working voltage: 220, 380V. 4.2.3 Control power supply voltage:
JB675193
AC; 6, 12, 24, 36, 42, 127, 220, 380V, DC: 6, 12, 24, 36, 48, 110, 220V4.2.4 The parameters of the starter do not meet the requirements of 4.2.1, 4.2.2 and 4.2.3 When other provisions of this standard are met, special treatment may be provided according to user needs.
4.2.5 Rated working current or rated working power The rated working current of electrical appliances is determined in the product standard, and the effects of rated working voltage, rated frequency, rated working system, use category and type of protective enclosure on it shall be taken into account. For starters that directly switch on and off individual motors, the rated working current may be replaced or supplemented by the maximum rated discharge rate of the expected controlled motor at the rated working voltage. The manufacturer shall provide the relationship between current and power. 4.2.6 Rated working system of starters
4.2.6.1 Eight-hour working system.
4.2.6.2 Uninterrupted working system.
4.2.5.3 Intermittent cycle working system.
The intermittent cycle working system uses three parameters: the current value, the number of on-off operation cycles per hour and the load factor (power-on duration rate) to express and verify the characteristics. The load factor is the ratio of the power-on time (t) to the on-off operation cycle (t,), usually expressed as a percentage. a.
The standard values of the load factor (power-on duration) are 15%, 25%, 40% and 60%; the starter can be divided into the following levels according to the number of on-off operation cycles it can perform per hour: Level 1
Level 120
Level 300
Level 600
Level 1200
5 Technical requirements
1 time/hour;
3 times/hour;
12 times/hour,
30 times/hour;
120 times/hour;
300 times/hour;
600 times/hour;
1200 times/hour.
The starter should be manufactured according to the prescribed procedures and approved by the national quality supervision and inspection department, and the "anti-dryness certificate" issued by the inspection department can be produced. 5.1 The technical indicators of the components of the starter (contactor, disconnector, fuse, etc.) shall not only comply with the provisions of this standard, but also comply with the provisions of their respective product standards.
5.2 Working conditions
5.2.1 The anti-light corrosion type starter should work properly under the following conditions: a.
The altitude shall not exceed 2000m;
The ambient temperature shall be -20~40℃;
The relative humidity of the surrounding air shall not exceed 95% (at 25℃); in the presence of explosive gas Environment;
The installation inclination with the vertical plane shall not exceed 5\; In a place without significant shaking and impact vibration; In an environment without obvious gas or steam that damages insulation; In a place without water and other liquids intrusion; 29
Pollution level: Level 3:
Installation category: Class 1;
JB6751-93
Starters used outdoors should be adapted to: relative humidity 100%, maximum solar radiation intensity 1120W/m2, rainfall intensity 6mm/min.
5.2.2 In addition to meeting the requirements of 5.2.1 a, d, e, f, i, j, the working conditions of the place of use of the starter for medium corrosion resistance and severe corrosion resistance shall meet the relevant provisions of JB4375.
5.3 Structural requirements
5.3.1 The electrical clearance of the starter main chamber determined by the pollution level, installation category (or rated impulse withstand voltage) and the maximum relative voltage determined by the rated voltage of the power system shall not be less than that specified in Table 1. Table 1
Maximum relative voltage determined by the rated voltage of the power system (AC effective value V
or DC value)
Installation category
Electrical clearance
Installation category
5.3.2 The creepage distance in the main cavity of the starter shall be no less than the minimum creepage distance specified in Table 2 according to pollution level 3, rated insulation voltage or maximum rated working voltage and material group. Insulating materials can be divided into the following categories according to their comparative tracking index (CTI): Insulating material group 1
Insulating material group 1
Insulating material group a
600≤CTI
400≤CTI<600
175≤CT<400
Rated insulation voltage (or actual working voltage V
125(127)
AC effective value or DC value)
Height of creepage
5.3.3 The electrical clearance and creepage distance of intrinsically safe circuits shall comply with the provisions of Article 4.6 of GB3836.4. The electrical clearance and creepage distance of each conductive part (position) inside the junction box (inside the main cavity when direct introduction is adopted) shall 5.3.4
comply with the provisions of Chapter 6 and Chapter 7 of GB3836.3. 5.3.5 The introduction device and wiring terminals of the starter shall comply with the provisions of JB4262 and Chapter 12 of GB3836.1; the increased safety type shall also comply with the provisions of Chapter 4 of GB3836.3; the intrinsic safety type shall also comply with the provisions of Article 4.5 of GB3836.4. The reversible starter shall be equipped with electrical interlocking and mechanical interlocking, and its interlocking mechanism shall comply with: 5.3.6
The mechanical interlocking shall ensure that the main contacts of the two contactors cannot be closed at the same time, and the electrical interlocking shall ensure that after one of the two contactors is closed, the control circuit of the other contactor is disconnected and cannot be attracted. There shall be a reliable interlocking device (mechanical or electrical) between the isolating switch and the casing of the starter. Ensure that the earth cavity can only be opened when the isolating switch is in the disconnected position; when the main cavity is opened, the isolating switch cannot be closed by the positive operation method. The shell fastened with a media bolt is allowed to be replaced by a warning sign, which must be marked with "open the cover after power off". 5.3.8 The closing and opening of the isolating switch should have clear and definite instructions and reliable positioning. 5.3.9 Except for the reversible starter, the isolating switch should be able to change the phase sequence. 5.3.10 There should be a reliable electrical interlock between the isolating switch and the contactor to ensure that the isolating switch can only change its position when the contactor control circuit is disconnected.
5.3.11 After the starter output end is powered off, if there are still live parts in the shell, a protective cover must be added and marked with a "live" warning sign. 5.3.12 The starter housing should be equipped with internal and external grounding bolts and marked with the grounding symbol "→". The bolt diameter must comply with the provisions of Chapter 16 of GB3836.1. For starters that are resistant to moderate and severe corrosion, the grounding bolts should be made of stainless metal materials or undergo reliable anti-corrosion treatment.
5.3.13 The ferrous metal parts of the starter, except for the working surface of the magnetic system, should have reliable anti-corrosion measures. 5.3.14 The metal parts of the starter should not have cracks or coating shedding. The surface of plastic parts should be smooth and free of bubbles, cracks and pitting.
The structural parameters of the flameproof housing of the flameproof starter should comply with the requirements of Chapter 7 of GB3836.2. 5.3.15
The flameproof surface of the flameproof starter should be treated with anti-corrosion and Meet the requirements of different corrosion protection levels. 5.3.17 The material of the starter casing shall comply with the provisions of Chapter 9 of GB3836.1 and Chapter 4 of GB3836.2. 5.3.18 The surface of the fasteners on the starter casing shall be galvanized and passivated or other electroplating treatments with good protective effects shall be applied. Measures must be taken to prevent loosening. After assembly of the starter with medium corrosion and severe corrosion resistance requirements, the exposed fasteners on the casing shall be sealed with tungsten or oxidized sealing mud.
5.3.19 The impact resistance of the starter casing and the transparent parts on the casing shall comply with the provisions of Chapter 24 of GB3836.1. The transparent parts on the casing shall also comply with the provisions of Chapter 10 of GB3836.2. 5.3.20 A clear, permanent embossed mark "Ex" (also known as "Ex") shall be set in a prominent position on the starter casing. The explosion-proof type, category, level, and temperature group mark can be marked).
5.3.21 The nameplate of the starter that is resistant to light corrosion must be made of yellow steel plated with nickel (chromium); the medium corrosion and heavy corrosion types must be made of acid-resistant stainless steel: its thickness must comply with the provisions of Article 36.5 of GB3836.1. After the nameplate is made, its surface should be coated with anti-corrosion air-drying varnish. 5.3.22 The paint on the surface of the starter casing should meet the requirements of different anti-corrosion levels. The surface of the casing of the outdoor starter should be covered with a light-colored coating. 5.4 Performance requirements
5.4.1 The starter should have the following protections:
Undervoltage protection;
Overload protection;
Short-circuit protection.
According to user needs, one or more of the following protections can also be added: a.||tt ||Main circuit leakage lockout protection;
Phase failure protection,
Other protections (overvoltage protection, electronic integrated protection, etc.). c.
5.4.3 The temperature rise limit of the starter insulation wire, the terminal connected to the external wire and the temperature rise limit of the accessible parts shall not exceed the provisions of Table 3, Table 4 and Table 5, and the maximum surface temperature of the shell shall comply with the provisions of Article 5.1 of GB3836.1. 5.4.4 The starter used outdoors should consider the impact of sunlight on the temperature rise. It can be designed for overflow according to the maximum ambient temperature of 40℃, but a certain margin must be left to offset the impact of sunlight. The value of the temperature rise margin is shown in Table 6. 5.4.5 The dielectric properties of the starter must be able to withstand the power frequency withstand voltage test specified in Table 7, and there must be no breakdown and flashover for 1 minute. 5.4.6 For control circuits and auxiliary circuits that are not allowed to be connected to the main circuit in the product standard, their rated test voltage must comply with the provisions of Table 8. 31
Heat resistance grade of insulation material
Terminal material
Scoring pot
Copper (yellow pot) tinned
Copper (copper) silver or nickel plated
Other metals
Parts
Non-metallic
Shell color
Brown fish, sun grey
JB6751-93
Temperature rise limit measured by resistance method
Temperature rise limit
Temperature rise margin
The temperature rise margin value of the shell in the table is the value of the maximum surface temperature allowed to be reduced as specified in Table 1 of GB3836.1. Note:
If a shield is installed, the temperature rise margin value in the table can be reduced by 30%. The shield cannot be close to the exterior light, and a certain distance should be left. Its area and shape should be able to block direct sunlight around the middle. Table
Rated insulation voltage U.
6011 After the starter output is powered off, if there are still live parts in the shell, a protective cover must be added and marked with a "live" warning sign. 5.3.12 The starter shell should be equipped with internal and external grounding bolts and marked with the grounding symbol "→". The bolt diameter must comply with the provisions of Chapter 16 of GB3836.1. For starters that are resistant to moderate corrosion and severe corrosion, the grounding bolts should be made of stainless metal materials or undergo reliable anti-corrosion treatment.
5.3.13 Except for the working surface of the magnetic system, the ferrous metal parts of the starter should have reliable anti-corrosion measures. 5.3.14 The metal parts of the starter shall not have cracks or coating shedding. The surface of plastic parts shall be smooth and free of bubbles, cracks and pitting.
The structural parameters of the flameproof shell of the flameproof starter shall comply with the requirements of Chapter 7 of GB3836.2. 5.3.15
The flameproof surface of the flameproof starter shall be treated with anti-corrosion and Meet the requirements of different corrosion protection levels. 5.3.17 The material of the starter casing shall comply with the provisions of Chapter 9 of GB3836.1 and Chapter 4 of GB3836.2. 5.3.18 The surface of the fasteners on the starter casing shall be galvanized and passivated or other electroplating treatments with good protective effects shall be applied. Measures must be taken to prevent loosening. After assembly of the starter with medium corrosion and severe corrosion resistance requirements, the exposed fasteners on the casing shall be sealed with tungsten or oxidized sealing mud.
5.3.19 The impact resistance of the starter casing and the transparent parts on the casing shall comply with the provisions of Chapter 24 of GB3836.1. The transparent parts on the casing shall also comply with the provisions of Chapter 10 of GB3836.2. 5.3.20 A clear, permanent embossed mark "Ex" (also known as "Ex") shall be set in a prominent position on the starter casing. The explosion-proof type, category, level, and temperature group mark can be marked).
5.3.21 The nameplate of the starter that is resistant to light corrosion must be made of yellow steel plated with nickel (chromium); the medium corrosion and heavy corrosion types must be made of acid-resistant stainless steel: its thickness must comply with the provisions of Article 36.5 of GB3836.1. After the nameplate is made, its surface should be coated with anti-corrosion air-drying varnish. 5.3.22 The paint on the surface of the starter casing should meet the requirements of different anti-corrosion levels. The surface of the casing of the outdoor starter should be covered with a light-colored coating. 5.4 Performance requirements
5.4.1 The starter should have the following protections:
Undervoltage protection;
Overload protection;
Short-circuit protection.
According to user needs, one or more of the following protections can also be added: a.||tt ||Main circuit leakage lockout protection;
Phase failure protection,
Other protections (overvoltage protection, electronic integrated protection, etc.). c.
5.4.3 The temperature rise limit of the starter insulation wire, the terminal connected to the external wire and the temperature rise limit of the accessible parts shall not exceed the provisions of Table 3, Table 4 and Table 5, and the maximum surface temperature of the shell shall comply with the provisions of Article 5.1 of GB3836.1. 5.4.4 The starter used outdoors should consider the influence of sunlight on the temperature rise. It can be designed for overflow according to the maximum ambient temperature of 40℃, but a certain margin must be left to offset the influence of sunlight. The value of the temperature rise margin is shown in Table 6. 5.4.5 The dielectric properties of the starter must be able to withstand the power frequency withstand voltage test specified in Table 7, and there must be no breakdown and flashover for 1 minute. 5.4.6 For the control circuit and auxiliary circuit that are not allowed to be connected to the main circuit in the product standard, the rated test voltage must comply with the provisions of Table 8. 31
Insulation material heat resistance grade
Terminal material
Copper (yellow pot) tinned
Copper (copper) silver or nickel plated
Other metals
Parts
Non-metallic
Shell color
Brown fish, sun gray
JB6751-93
Temperature rise limit measured by resistance method
Temperature rise limit
Temperature rise margin
The temperature rise margin value of the shell in the table is the value of the maximum surface temperature allowed to be reduced as specified in Table 1 of GB3836.1. Note:
If a shield is installed, the temperature rise margin value in the table can be reduced by 30%. The shield cannot be close to the exterior light, and a certain distance should be left. Its area and shape should be able to block direct sunlight around the middle. Table
Rated insulation voltage U.
6011 After the starter output is powered off, if there are still live parts in the shell, a protective cover must be added and marked with a "live" warning sign. 5.3.12 The starter shell should be equipped with internal and external grounding bolts and marked with the grounding symbol "→". The bolt diameter must comply with the provisions of Chapter 16 of GB3836.1. For starters that are resistant to moderate corrosion and severe corrosion, the grounding bolts should be made of stainless metal materials or undergo reliable anti-corrosion treatment.
5.3.13 Except for the working surface of the magnetic system, the ferrous metal parts of the starter should have reliable anti-corrosion measures. 5.3.14 The metal parts of the starter shall not have cracks or coating shedding. The surface of plastic parts shall be smooth and free of bubbles, cracks and pitting.
The structural parameters of the flameproof shell of the flameproof starter shall comply with the requirements of Chapter 7 of GB3836.2. 5.3.15
The flameproof surface of the flameproof starter shall be treated with anti-corrosion and Meet the requirements of different corrosion protection levels. 5.3.17 The material of the starter casing shall comply with the provisions of Chapter 9 of GB3836.1 and Chapter 4 of GB3836.2. 5.3.18 The surface of the fasteners on the starter casing shall be galvanized and passivated or other electroplating treatments with good protective effects shall be applied. Measures must be taken to prevent loosening. After assembly of the starter with medium corrosion and severe corrosion resistance requirements, the exposed fasteners on the casing shall be sealed with tungsten or oxidized sealing mud.
5.3.19 The impact resistance of the starter casing and the transparent parts on the casing shall comply with the provisions of Chapter 24 of GB3836.1. The transparent parts on the casing shall also comply with the provisions of Chapter 10 of GB3836.2. 5.3.20 A clear, permanent embossed mark "Ex" (also known as "Ex") shall be set in a prominent position on the starter casing. The explosion-proof type, category, level, and temperature group mark can be marked).
5.3.21 The nameplate of the starter that is resistant to light corrosion must be made of yellow steel plated with nickel (chromium); the medium corrosion and heavy corrosion types must be made of acid-resistant stainless steel: its thickness must comply with the provisions of Article 36.5 of GB3836.1. After the nameplate is made, its surface should be coated with anti-corrosion air-drying varnish. 5.3.22 The paint on the surface of the starter casing should meet the requirements of different anti-corrosion levels. The surface of the casing of the outdoor starter should be covered with a light-colored coating. 5.4 Performance requirements
5.4.1 The starter should have the following protections:
Undervoltage protection;
Overload protection;
Short-circuit protection.
According to user needs, one or more of the following protections can also be added: a.||tt ||Main circuit leakage lockout protection;
Phase failure protection,
Other protections (overvoltage protection, electronic integrated protection, etc.). c.
5.4.3 The temperature rise limit of the starter insulation wire, the terminal connected to the external wire and the temperature rise limit of the accessible parts shall not exceed the provisions of Table 3, Table 4 and Table 5, and the maximum surface temperature of the shell shall comply with the provisions of Article 5.1 of GB3836.1. 5.4.4 The starter used outdoors should consider the impact of sunlight on the temperature rise. It can be designed for overflow according to the maximum ambient temperature of 40℃, but a certain margin must be left to offset the impact of sunlight. The value of the temperature rise margin is shown in Table 6. 5.4.5 The dielectric properties of the starter must be able to withstand the power frequency withstand voltage test specified in Table 7, and there must be no breakdown and flashover for 1 minute. 5.4.6 For control circuits and auxiliary circuits that are not allowed to be connected to the main circuit in the product standard, their rated test voltage must comply with the provisions of Table 8. 31
Heat resistance grade of insulation material
Terminal material
Scoring pot
Copper (yellow pot) tinned
Copper (copper) silver or nickel plated
Other metals
Parts
Non-metallic
Shell color
Brown fish, sun grey
JB6751-93
Temperature rise limit measured by resistance method
Temperature rise limit
Temperature rise margin
The temperature rise margin value of the shell in the table is the value of the maximum surface temperature allowed to be reduced as specified in Table 1 of GB3836.1. Note:
If a shield is installed, the temperature rise margin value in the table can be reduced by 30%. The shield cannot be close to the exterior light, and a certain distance should be left. Its area and shape should be able to block direct sunlight around the middle. Table
Rated insulation voltage U.
60
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