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GB 12476.7-2010: Electrical apparatus for use in the presence of combustible dust -- Part 7: Type of protection “pD”
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Electrical apparatus for use in the presence of combustible dust -- Part 7: Type of protection “pD”
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GB 12476.7-2010
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Basic data | Standard ID | GB 12476.7-2010 (GB12476.7-2010) | | Description (Translated English) | Electrical apparatus for use in the presence of combustible dust -- Part 7: Type of protection ��pD�� | | Sector / Industry | National Standard | | Classification of Chinese Standard | K35 | | Classification of International Standard | 29.260.20 | | Word Count Estimation | 15,189 | | Date of Issue | 2010-08-09 | | Date of Implementation | 2011-08-01 | | Quoted Standard | GB 755-2008; GB 12476.2-2010; IEC 61241-0-2004 | | Adopted Standard | IEC 61241-4-2001, IDT | | Regulation (derived from) | Announcement of Newly Approved National Standards No. 3, 2010 (No. 158 overall) | | Issuing agency(ies) | General Administration of Quality Supervision, Inspection and Quarantine of the People's Republic of China, Standardization Administration of the People's Republic of China | | Summary | This Chinese standard applies to housing and its associated components to structure requirements, if any, further comprising a protective gas inlet pipes and exhaust pipes, as well as ensure the formation of positive and ensure positive protective"pD"security measures and necessary safety devices required. | GB 12476.7-2010: Electrical apparatus for use in the presence of combustible dust -- Part 7: Type of protection “pD”
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Electrical apparatus for use in the presence of combustible dust.Part 7. Type of protection "pD"
ICS 29.260.20
K35
National Standards of People's Republic of China
Combustible dust Electrical Equipment
Part 7. protective positive pressure "pD"
Part 7. Typeofprotection "pD"
(IEC 61241-4.2001, IDT)
Issued on. 2010-08-09
2011-08-01 implementation
Administration of Quality Supervision, Inspection and Quarantine of People's Republic of China
Standardization Administration of China released
Table of Contents
Preface Ⅰ
1 Scope 1
2 Normative references 1
3 Terms and definitions
4 positive principle 3
5 general structure of claim 3
6 Temperature Limit 4
7 safety measures and safety devices (except static positive pressure protection) 5
8 static positive pressure safety measures and safety devices 7
9 7 protective gas supply
10 inspection and testing 7
11 flag 8
Pipeline Annex A (normative) to protect a source of gas 10
Figure A.1 along the pipeline and static overpressure example by pressurized enclosure 10
Static overpressure example of Figure A.2 with fan positive pressure type rotary motor 11
Table 1 positive fault protection requirements 6
Foreword
All technical content in this section is mandatory.
GB 12476 "combustible dust electrical equipment" is divided into several parts.
--- Part 1. General requirements
--- Part 2. Selection and installation
--- Part 3. combustible dusts exist or may exist Classification of hazardous areas
--- Part 4. Intrinsic safety "iD"
--- Part 5. Housing protection type "tD"
--- Part 6. protective encapsulation "mD"
--- Part 7. protective positive pressure "pD"
--- Part 8. Test methods for determining the minimum ignition temperature of a dust
--- Part 9. Test method for determination of the dust layer resistivity
--- Part 10. Test methods for dust and air mixture Determination of minimum ignition energy
Part of this section is GB 712 476, the equivalent to using IEC 61241-4.2001 "combustible dust Electrical apparatus
Part 4. Protection of positive pressure type "pD" "(in English).
This part of IEC 61241-4.2001 includes the following editorial changes.
--- Remove the IEC 61241-4.2001 Foreword;
--- Increase the national standard foreword.
Appendix A of this part is a normative appendix.
This part is proposed by the China Electrical Equipment Industrial Association.
This part of the National explosion-proof electrical equipment Standardization Technical Committee (SAC/TC9) centralized.
This part mainly drafted by. Explosion Protection Electric Institute.
This part of the main participants. National explosion-proof electrical products for Quality Supervision and Inspection Center, Jiangsu Oerlikon explosion-proof Electric Co., a positive anti
Explosion Electric Co., Ltd., Shenyang Yijia Sampoong Electric Co., Ltd. Huarong Group.
The main drafters of this section. Shu toward the peak, Wu Jianguo, Chen Rui, Zhou Jing, Liu Qi Ying.
Combustible dust Electrical Equipment
Part 7. protective positive pressure "pD"
1 Scope
GB 12476 of the provisions of this part of the combustible dust design, construction, testing and marking of electrical equipment requirements specified in the set
Filling into the prepared shell protective gas (air or inert gas) to a pressure higher than the external ambient pressure to prevent dust entering free of
Combustible dust emission source enclosure, avoid the formation of combustible dust within the housing.
This section also sets out specific requirements for construction and testing, including intended for pressurized flammable dust environment protection type "pD" Electrical Equipment
Protection requirements.
This section applies to the structural requirements of the housing and its associated components, if any, further comprising a protective gas intake duct and exhaust pipe
Road and "pD" security measures and safety devices to ensure the formation of positive and maintain a positive pressure protective requirements necessary.
This section does not apply to pressurized enclosures required to have an internal source of dust emission.
This section does not apply with or without an internal source of dust release positive pressure room.
This section does not apply to those Explosives dust or spontaneously combustible materials can not require atmospheric oxygen for combustion.
This section does not involve the danger of flammable gas and dust mixture.
2 Normative references
The following documents contain provisions which, through reference in this Part of GB 12476, constitute provisions of this part. For dated reference documents
Member, all subsequent amendments (not including errata content) or revisions do not apply to this section, however, encouraged to reach under this section
Parties to research agreement to use the latest versions of these documents. For undated reference documents, the latest versions apply to this section.
GB 755-2008 rotating motor fixed and performance (IEC 60034-1.2004, IDT)
GB 12476.2-2010 combustible dust electrical equipment Part 2. Selection and installation (IEC 61241-14.2004, IDT)
IEC 61241-0.2004 Electrical apparatus for use of combustible dust - Part 0. General requirements 1)
3 Terms and Definitions
This section uses IEC 61241-0.2004 and identified the following terms and definitions.
3.1
Positive protective "pD" typeofprotection "pD"
One kind of type of protection for the outward shell filled with protective gas, to keep within the enclosure above ambient overpressure inside the enclosure to avoid
Form explosive dust atmosphere.
3.2
Overpressure overpressure
Pressurized enclosure internal pressure above ambient pressure.
3.3
Positive pressurization protection
Holding pressure of the gas within the enclosure protection higher than the external atmospheric pressure, to prevent the external environment can form explosive dust into the housing
Methods.
1) coming into national standards. GB 12476.1 "combustible dust Electrical Equipment Part 1. General requirements" (IEC 61241-0.2004,
MOD).
3.4
Protective gas protectivegas
For holding air or inert gas through the pressure.
Note. This section refers to the inert gas is nitrogen, carbon dioxide, argon gas or the like, when it is 4 to 1 in proportion with oxygen in the air to form a mixture does not cause
From the ignition and form a combustible properties and more serious cases, such as the explosion limit.
3.5
Housing enclosure
Tolerance and protection of electrical equipment live parts of electrical equipment throughout the enclosure walls, including doors, covers, cable glands, a joystick, and the mandrel
Shaft.
3.6
Pressurized enclosure pressurizedenclosure
Maintaining the internal pressure of protective gas is higher than the atmospheric pressure outside of the housing.
NOTE. pressurized enclosure may or may not be inclusive and protect the live parts of electrical equipment housing other components.
3.7
Static positive pressure protection staticpressurization
Equipment operation without adding a shielding gas is maintained within the hazardous area protection methods pressurized enclosure overpressure values.
3.8
Having a positive pressure leakage compensation protection pressurizationwithleakagecompensation
In the housing air outlet (if any) when closed, pressurized protective gas source sufficient to compensate for any leaks in the shell and the pipe is held therein
Overvoltage protection methods.
3.9
Protective gas continuous flow of positive protection pressurizationwithcontinuousflowoftheprotectivegas
Shielding gas by maintaining a continuous flow inside the pressurized enclosure overpressure protection methods within the housing.
3.10
Electrical equipment electricalapparatus
All or part of the use of power equipment, which include power generation, transmission, distribution, storage, measuring, regulating, converters, electrical equipment and communication
Hearing devices.
3.11
Ignition devices have the ability to ignition-capableapparatus
Under normal operating conditions, environmental regulations for combustible dust forming apparatus effective ignition sources, including unspent combustible dust
Type of protection of electrical equipment to protect electrical equipment.
3.12
Since significant fault self-revealingfault
Will cause equipment malfunction and before the equipment must be adjusted to run again, you can express through sound or visual signal failure.
3.13
Opening opening
Hole, door, window or air-tight installation of the panel.
3.14
Protection protectivedevice
The system provides protection against fire or explosion resulting in a device.
3.15
Alarm alarm
Generating a visual or sound signals to the attention of device components.
3.16
Indicator measuring instruments
Measurements show flow or pressure is appropriate, and periodic calibration of equipment to meet the requirements of the device.
3.17
Equipment to be protected protectedapparatus
Installed in the pressurized enclosure of electrical equipment.
3.18
Positive pressure protection system pressurizationsystem
And monitoring element for a supercharged combination of pressurized enclosure.
3.19
Alternative (or auxiliary) protective gas supply alternate (orauxiliary) sourceofsupplyofprotectivegas
In case of failure of the main source of protective gas for protective gas source.
3.20
Area zones
According to the frequency and duration of explosive dust/air environment for explosive dust environment appears divided region.
3.21
Zone 20 zone20
Combustible dust cloud in the air long-term consecutive or region form an explosive environments often.
3.22
Zone 21 zone21
During normal operation, the air may occasionally occur combustible dust cloud formation region explosive atmospheres.
3.23
22 area zone22
During normal operation, the air of combustible dust cloud unlikely, if only for a short time in the presence of an explosive environment
area.
4 positive principle
Positive pressure explosion-proof protection type is a type, when the inner casing of electrical power equipment, protective gas source within the enclosure to withstand continuous overvoltage.
In the design of positive pressure protection system, the following basic principles.
4.1 protective gas
Appropriate to maintain a pressure above a predetermined pressure value shielding gas source, except static positive pressure Chapter 7 provisions.
4.2 automatically disconnected or alarm
Positive pressure protection system automatically disconnect power and/or activate the alarm when a fault occurs.
4.3 Purge
After the enclosure shall be purged before the power is turned on, a positive pressure in order to remove the protection of a system failure or a normal shutdown after accidentally gathered outside
The remaining combustible dust shell.
4.4 Protection of gas emissions
It is preferable to protect the gas discharged non-hazardous location. In the continuous flow positive protection, if the protective gas is discharged hazardous locations
Which should be provided under normal or fault conditions to avoid the hot particles or other ignition source from the device into the hazardous area approach.
5 General structural requirements
Electrical performance 5.1 devices
Electrical properties of the enclosure contains devices should enable the functionality of the device reaches its full rated value, and recognizes overload (if any) does not
Damage to housing or the surface temperature rises above a predetermined limit.
Note. Consider the potential to prevent the arc fault protection and safety devices could lead to failure to consider the housing security measures, while considering the configured fault level
Included.
5.2 Mechanical strength
During normal operation and under all vents closed state, the pressurized enclosure piping components and their connections should be able to withstand specified by the manufacturer
Given 1.5 times the maximum positive pressure, the minimum pressure is at least 200Pa.
If the pressure generated during operation may cause deformation of the casing pipe or connecting parts, the manufacturer shall set the security apparatus, the maximum positive internal
Pressure limited to less than might have an adverse impact on the type of protection levels.
Note. For a surface area to withstand a pressure of more than 1kPa large equipment (for example, sheet metal shell), the pressure vessel may require statutory authority approval.
5.3 into (the) air inlet
5.3.1 For static pressure protection of housing, there should be one or more air intakes. Inflated positive pressure to achieve positive protection, all air intakes
It should be closed.
5.3.2 For the protection of leakage compensation pressurized enclosure shall have one or more air intakes.
5.3.3 For continuous flow of protective gas pressurized protective shell, should one or more air inlets and one or more outlet for
Connecting the gas inlet duct and outlet duct.
5.4 housing electrical connections
The method should be used to introduce the wire cable glands or conduit is introduced directly into the housing and can maintain protection function, or may be used in line with
Combustible dust atmospheres type of protection of electrical equipment to protect independent junction box.
5.5 and cover
Since the presence of an external explosive dust environment, because if the remaining energy inside the device or component parts of the surface temperature on the (greater than
0.2mJ) may bring the risk of explosion must open the case, the door and lid should be set to delay warning given after disconnecting the power supply to comply
delay.
Do not use tools to be able to open doors and covers should be interlocked with the power to cut all power to electrical equipment.
In the case of static positive pressure, doors and covers can be opened only with a tool, and should set up a warning.
Pressurized enclosure should be opened in a non-hazardous location
To be able to check if in use, and set the door and lid should be provided on which the warning or equivalent warning.
No live-open
Unless measures are taken for adjustment during operation, in which case the warning shall state.
Read the instruction manual before opening.
To effectively purged enclosure shall provide adequate number of openings. Design and distribution of the number of opening devices shall be selected, with special consideration
Electrical equipment may be divided into a small cavity purged needs.
Temperature Limit 6
Equipment should IEC 61241-0.2004 requirements are grouped according to the following temperature higher determined.
a) the maximum outer surface temperature of the housing;
b) comply with the protective gas source combustible dust explosion-proof type of protection of electrical equipment and internal parts when used with positive pressure
Internal parts remain energized cancellation or failure (e.g., electric heaters) the maximum surface temperature.
During normal operation, the temperature of the inner surface may be exposed to explosive dust environment exceeds IEC 61241-0.2004 for the device temperature
The highest value of the specified group, to take appropriate measures when the positive protection interrupt when the inner surface is cooled to below the maximum value allowed before prevention
Any explosive dust atmospheres may occur in contact with the surface. The above requirement is met by the design and structure of the pressurized enclosure and pipe joints or
Other ways to achieve, for example. Replace (or auxiliary) shielding gas source into operation or hot surfaces inside the pressurized enclosure or mounted in dust tight
Encapsulated within the housing.
In determining the rotation of the motor temperature, should be considered in line with the manufacturer according to GB 755-2008 specified operating system.
7 safety measures and safety devices (except static positive pressure protection)
7.1 Overview
Protective measures should be taken to avoid electrical equipment installed in the pressurized enclosure prior to the formation of positive power. All safety devices should be
a) comply with combustible dust protection with a particular type of explosion-proof electrical equipment; or
b) non-electrical and not cause ignition; or
c) a non-hazardous location.
This section requires a security element of a security-related components of the control system. Security manufacturers and users responsible for assessing the control system
And integrity are reasonable.
Safety devices shall be set by the user or the device manufacturer. If the flag should be set by the user on the safety device, the device "X", and the use of
User manual should include the necessary provisions to ensure compliance with this section for all claims.
After the shell should be turned on or turned on again before the purge to clear the positive pressure protection system failure in the power supply system or normal stop
After the machine occasionally gathered in the case of the remaining combustible dust. The manufacturer shall provide the necessary detailed description of the requirements that purge housing
Manual.
Manufacturers should specify a maximum and minimum operating values and tolerances safety devices. Due consideration of the worst pieces of specified normal operation
Member, a safety device shall be specified by the manufacturer for use in the normal operating range.
7.2 pressure or flow responsive means
Pressure alarm and electrical trip device to run and set up in response to pressure within the housing apparatus should be less than the minimum or exceeds the maximum allowed
Maximum pressure operation.
Traffic monitoring device for the alarm and electrical trip device operation and should be set within the housing pressure is below the minimum or exceeds the maximum allowed
When the maximum movement and traffic monitoring device should be located at the outlet.
Electrical interlocking fan motor or controller does not show positive for the fault, when the fan belt slippage occurs, the fan is loose on the shaft
Or reverse the fan, do not show positive electrical interlock fault.
7.3 Power
If no positive after avoiding system downtime or failure to protect dust into the protection, you should set up warning signs, indicating the power is turned on
Clear internal source of dust before.
7.4 off the power
Cut off the power if the requirements of this section, in accordance with the requirements of GB 12476.2 shall cut off all live conductors, including the neutral line.
7.5 positive fault
The design principle of positive pressure protection system is positive fault auto power off the system and/or activate the alarm.
To avoid the positive protection of electrical equipment could cause an explosion in the case of protective gas supply disruptions, should take the following measures, these measures
Shi should consider the performance of equipment, environmental conditions and the use of monitoring and warning devices at the time.
7.5.1 protection requirements
Positive protection equipment requirements vary following the risks associated with different grades.
--- The type of equipment used; and
--- Classification places; and
--- Specific installation and process requirements.
These conditions require power off and alarm, or only require alarms.
No matter what protection measures, should take the following measures.
a) All the case in the absence of positive pressure on energized electrical equipment shall be suitable for explosive dust atmospheres located.
b) shall be provided a visual or audible alarm device, to take the necessary action immediately see or hear warning signal directly in charge of personnel.
c) should be used to monitor pressure, flow monitoring device, or both devices to monitor compliance with the requirements of positive features.
Table pressurized fault protection requirements of one pair
Regional Collections
Type of housing equipment
Have the ability to ignite the electrical equipment in normal operation without ignition sources equipment
Zone 20 NA NA a a
Zone 21 7.5.1.1 7.5.1.2
Zone 22 7.5.1.2 does not require the internal positive pressure
a 20 zone with all requirements of the equipment is still under consideration.
7.5.1.1 power off
The following requirements apply.
a) should be set to automatic devices to shut off all power protection devices, unless the equipment consists of combustible dust electrical equipment for a
Or more of the type of protection protection, and lower than the minimum prescribed value in positive and/or shielding gas flow when the startup sound and/or visual
Alarm. In special cases, when the device is used in equipment or unexpected power outages may endanger the safety of the device, the adjustment may be required
Whole, reset a continuous sound or visual alarm until the resumption of positive pressure or take another appropriate action so far.
b) do not use tools to be able to open doors and covers should be interlocked so as to turn off all open any doors or covers by the combustible dust ring
Habitat with a plurality of electrical equipment of the type of protection or the protection of the power components, if any, including all phases and neutral power
line. Must prevent the power is turned on again until all doors and the lid is closed again.
c) warning device shall be fixed in a prominent place, stated the following warnings or equivalent warning.
WARNING. Electric purge evacuation
7.5.1.2 Alarm only
The following requirements apply.
A) The device should be set to automatic, positive pressure and/or protective gas flow rate below the minimum prescribed value to the operator providing voice and/or visual
The police, in order to take appropriate measures.
b) all unused tools can open doors and covers should be set warning.
WARNING. combustible dust, prohibited live on.
c) warning device shall be fixed in a prominent place, stated the following warnings or equivalent warning.
WARNING. Electric purge evacuation
7.6 Overvoltage Category
With respect to the external atmospheric pressure, the pressure in the pressurized enclosure may have leaked and the pipe should be kept to the lowest points of 50Pa
Overpressure.
Housing and piping systems in different instances of pressure distribution Figure A.1 ~ Figure A.2.
Note. The rotary motor should adopt the enclosed structure. The apparatus has accelerated through the inner fan inside the closed loop cooling circuit, should consider the use of pressurized equipment, because
It can generate a negative pressure in the housing component of the role of these fans, if the positive external dust hazard protection failure will occur and then entered (see Figure A.2).
7.7 Potential ignition sources
When the components are protected devices built with an ignition source (such as a battery), take appropriate measures when designing equipment to ensure that these
Components are designed to be suitable for external and internal environment with characteristics of the type of protection, in order to avoid accidental spark generation. These components should be clearly
Identity.
7.8 interior parts
There is no inner shell parts continue to operate under the protection of gas situations, such as during the operation of the heating device is not a device, the application breaks
Close to combustible dust explosion protection in one type of electrical equipment to apply to specific dangerous places.
7.9 Independent housing
If the device is not used for the most part composed of a plurality of housing means, share the same protective gas source, the design should consider the entire apparatus
Favorable conditions.
If you do not have to cut the common protective device, open the door or cover all the power in the following circumstances or activate the alarm.
a) After opening the door or lid unprotected devices before opening the door or covers, disconnect its power supply, or to achieve a common purpose,
The door interlock with power; and
b) a common protective device continues to be used to monitor other devices.
8 static positive pressure safety measures and safety devices
8.1 Additional requirements for static positive pressure
The pressurized enclosure shall be specified by the manufacturer of the method in a non-hazardous area filled with inert gas.
It shall provide one or more automatic safety devices, so that in the pressurized enclosure overpressure falls below the minimum value specified by the manufacturer when moving
Make. When the device is running should be able to check the correct operation of these safety devices. These automatic devices can only be used to re-key or tool
Reset.
Note 1. Use automatic device (ie. pow...
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