MT/T 1078-2008 PDF English
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MT/T 1078-2008: Direct current power supply with intrinsically safe output for a coal mine---This is an excerpt. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.), auto-downloaded/delivered in 9 seconds, can be purchased online: https://www.ChineseStandard.net/PDF.aspx/MTT1078-2008
MT
COAL INDUSTRY STANDARD OF
THE PEOPLE’S REPUBLIC OF CHINA
ICS 73.100.99
D 98
File No.. 25344-2008
Direct current power supply with intrinsically
safe output for a coal mine
Issued on. NOVEMBER 19, 2008
Implemented on. JANUARY 01, 2009
Issued by. State Work Safety Administration
Table of Contents
Foreword... 3
1 Scope... 4
2 Normative references... 4
3 Product classification... 6
4 Technical requirements... 7
5 Test methods... 12
6 Inspection rules... 18
7 Marking, packaging, transportation and storage... 20
Foreword
This Standard was proposed by Science and Technology Development Department
by China Coal Industry Association.
This Standard shall be under jurisdiction of Technical Committee for Standardization
of Equipment for Coal Mining in Coal Industry.
Drafting organizations of this Standard. China University of Mining &Technology
(Beijing), Changzhou Automation Research Institute of Coal Science Research
Institute and HuaiBei Mining Co., Ltd.
Main drafters of this Standard. Sun Jiping, Peng Xia, Li Wei, Tian Zijian.
Direct current power supply with intrinsically safe
output for a coal mine
1 Scope
This Standard specifies the product classification, technical requirements, test
methods, inspection rules, mark, packaging, transportation and storage of direct
current power supply with intrinsically safe output for a coal mine.
This Standard applies to direct current power supply with intrinsically safe output for a
coal mine (hereinafter referred to as DC power supply).
2 Normative references
The provisions in following documents become the provisions of this Standard through
reference in this Standard. For dated references, the subsequent amendments
(excluding corrigendum) or revisions do not apply to this Standard, however, parties
who reach an agreement based on this Standard are encouraged to study if the latest
versions of these documents are applicable. For undated references, the latest edition
of the referenced document applies.
GB/T 191 Packaging - Pictorial marking for handling of goods (GB/T 191-2000,
eqv ISO 780.1997)
GB/T 2423.1 Environmental testing for electric and electronic and electronic
products - Part 2.Test methods - Tests A. Cold (GB/T 2423.1-2001, idt IEC
60068-2-1.1990)
GB/T 2423.2 Environmental testing for electric and electronic products - Part 2.
Test methods - Tests B. Dry heat (GB/T 2423.2-2001, idt IEC 60068-2-1.1990)
GB/T 2423.3 Basic environmental testing procedures for electric and electronic
products - Test Ca. Damp heat, steady state (GB/T 2423.2-1992, eqv IEC
68-2-3.1984)
GB/T 2423.4 Basic environmental testing procedures for electric and electronic
products - Test Db. Damp heat, cyclic (GB/T 2423.4-1993, eqv IEC 68-2-3.1980)
GB/T 2423.5 Environmental testing for electric and electronic products - Part 2.
Test methods - Test Ea and guidance. Shock (GB/T 2423.5-1995, idt IEC
68-2-27.1982)
GB/T 2423.10 Environmental testing for electric and electronic products - Part 2.
Test methods - Test Fc and guidance. Vibration (Sinusoidal) (GB/T 2423.10-1995,
idt IEC 68-2-6.1982)
3 Product classification
3.1 Model
Model of product shall be in accordance with the specifications of MT/T 286.
3.2 Classification
3.2.1 According to explosion proof type.
3.2.2 According to operating principle.
3.2.3 According to output function.
4 Technical requirements
4.1 General requirements
DC power supply shall meet the requirements of this Standard, MT/T 1004, AQ 6201,
etc., and shall be produced according to drawing and technical documents approved
by specified procedure.
4.2 Environmental condition
4.3 Rated power supply condition
4.3.1 Source voltage. in accordance with Table 3.
4.3.2 Source frequency. 50 Hz, permissible deviation is ± 5%.
4.3.3 Harmonic wave. not more than 10%.
4.4 Main technical parameters
4.4.1 AC rated input voltage
AC rated input voltage shall meet input of 127 V and 220 V, it can also be chosen from
36 V, 127 V, 380 V, 660 V, 1140 V, etc.
4.5 Main functions
4.5.1 It shall have input and output power supply indication function.
4.5.2 It shall have current-limiting, voltage limiting and short circuit protection function,
thus automatic recovery can be made after fault is removed.
4.5.3 AC power supply with standby battery.
4.6 Structure
4.6.1 Fasteners shall have measures that avoid automatic loose.
4.8 Protective function of enclosure
Protective function of enclosure shall be in accordance with GB 3836.1 ~ GB 3836.4,
GB 3836.9, GB 12173 and other relevant standards.
4.9 Electric safety
4.9.1 Insulation resistance between circuit with power of DC power supply and
grounding (or enclosure) shall be in accordance with Table 4.Measurement locations
shall be specified in relevant standards.
4.14.4 AC power supply shall pass storage in low temperature working test; the main
technical parameters, functions and appearance shall not be below requirements of
this Standard.
4.15 Explosion-proof performance
AC power supply of explosion proof type shall be in accordance with the relevant
specifications of GB 3836.1 ~ GB 3836.4 and GB 3836.9, which shall have dual or
multiple current-limiting, voltage limiting and circuit protection function.
4.16 Performance of mining general type
Performance of mining general type shall be in accordance with the specifications of
GB 12173.
4.17 Intrinsically safe parameters
4.17.1 The highest output voltage shall meet requirements of intrinsically safe
explosion proof and shall be specified in relevant standards.
4.17.2 Maximum output current shall meet requirements of intrinsically safe explosion
proof and shall be specified in relevant standards.
5 Test methods
5.1 Environmental conditions
Unless otherwise specified in environmental test and relevant standards, test shall be
conducted in the following environmental conditions.
5.2 Main technical parameters and main function test
5.2.1 Measuring apparatus and equipment
5.2.1.1 General requirements for measuring apparatus and equipment
5.2.1.2.3 Artificial load. Adjust the artificial load to obtain load current, maximum
output current and circuit current that are needed by AC power supply output test.
5.2.1.2.4 Voltage regulator. it shall be in accordance with requirements of relevant
standards.
5.2.1.2.5 Oscilloscope, storage oscilloscope and video milli-voltmeter. it shall meet
requirements of relevant standards.
5.2.2 Test circuit
Connect test equipment according to figure 1, S1 and S2 in figure are single-phase
switches.
Figure 1 Test circuit
5.2.3 Test steps
5.2.3.5 Current limiting and short circuit protection function
SET source voltage as specified maximum value, ADJUST artificial load to make load
current gradually increase to output short circuit. OBSERVE ampere meter (A), the
maximum current is maximum output current of AC power supply, final indicating
value is short circuit current of AC power supply. REMOVE over-current and
short-circuit faults, INSPECT whether AC power supply can recover by itself or not.
CARRY out test for 5 times continuously.
For multi-circuit output AC power supply, output of other circuits shall be rated load.
5.4 Appearance inspection
ADOPT visual inspection.
5.5 Enclosure protective performance inspection
Enclosure protective performance inspection shall be conducted in accordance with
the relevant specifications of GB 4208.
5.6 Measurement of insulation resistance
Measurement of insulation resistance shall be conducted in accordance with the
relevant specifications of MT 210.
5.10 Anti-interference test
Anti-interference test shall be conducted in accordance with the specifications of GB/T
17626.3-2006, GB/T 17626.4-1998 and GB/T 17626.5-1999.
5.11 Reliability test
Reliability test shall be conducted in accordance with the relevant specifications of
GB/T 5080.7, ADOPT fixed time test plan. Failure judgment shall be conducted in
accordance with the relevant specifications of 9.2 in GB/T 5080.1.
5.12 High temperature working test
High temperature test shall be conducted in accordance with relevant specifications of
GB/T 2423.2.AC power supply to be tested shall be at connection state for 2
continuous hours with a severity level of highest working environmental temperature.
5.16 Damp heat test
5.16.1 Damp heat test below mine shall be carried out according to relevant
specifications of GB/T 2423.4, severity level is +40°C, and period is 12 d.
Measurement and voltage withstand test of insulation resistance shall be carried out
in 2 h before completion of test (at stage of low temperature with high humidity). After
test, main technical parameters and main functions shall be inspected.
5.17 Vibration test
Vibration test shall be carried out in accordance with GB/T 2423.10, severity level
shall be in accordance with the specifications of Table 6.
6 Inspection rules
6.1 Inspection rules
Inspection consists of factory-exit inspection and type inspection.
6.2 Factory-exit inspection
6.2.1 AC power supply shall be carried out for factory-exit inspection. Qualified
products shall be given certificate.
6.3 Type inspection
6.3.1 Type inspection shall be carried out when one of the following circumstances
occurs.
6.3.2 Inspection items shall be in accordance with the specifications of Table 8.
6.3.5 When batch number is more than 50, sampling inspection shall be carried out
according to GB/T 2829-2002.Choose one-time sampling scheme; judgment level is
III; rejectable quality level (RQL) is not more than 40.Specified RQL of A item is
usually below that of B item; specified RQL of C item is usually more than that of B
item. For type A item, if one-item is unqualified, then the whole batch is judged as
unqualified products, for B- and C-item, unqualified quantities determined shall be in
accordance with relevant standards.
7 Marking, packaging, transportation and storage
7.1 Marking
7.1.1 Product marks
7.1.1.1 Explosion-proof-type AC power supply shall have MA safety mark.
7.1.2 Packaging marks
7.1.2.1 Mark of packaging, storage and transportation shall be in accordance with the
specifications of GB/T 191.
7.1.2.2 Characters and marks written in external packing box shall at least include.
7.2 Packaging
7.2.1 Packaging pattern of AC power supply shall be in accordance with the relevant
specifications of nation and industries, and shall be specified clearly in relevant
standards.
7.2.2 Accompanying documents shall include.
7.3 Transportation
Avoiding rain and snow, AC power supply after packaging is suitable for various
transportation modes such as water transportation, land transportation and air
transportation.
MT/T 1078-2008
MT
COAL INDUSTRY STANDARD OF
THE PEOPLE’S REPUBLIC OF CHINA
ICS 73.100.99
D 98
File No.. 25344-2008
Direct current power supply with intrinsically
safe output for a coal mine
Issued on. NOVEMBER 19, 2008
Implemented on. JANUARY 01, 2009
Issued by. State Work Safety Administration
Table of Contents
Foreword... 3
1 Scope... 4
2 Normative references... 4
3 Product classification... 6
4 Technical requirements... 7
5 Test methods... 12
6 Inspection rules... 18
7 Marking, packaging, transportation and storage... 20
Foreword
This Standard was proposed by Science and Technology Development Department
by China Coal Industry Association.
This Standard shall be under jurisdiction of Technical Committee for Standardization
of Equipment for Coal Mining in Coal Industry.
Drafting organizations of this Standard. China University of Mining &Technology
(Beijing), Changzhou Automation Research Institute of Coal Science Research
Institute and HuaiBei Mining Co., Ltd.
Main drafters of this Standard. Sun Jiping, Peng Xia, Li Wei, Tian Zijian.
Direct current power supply with intrinsically safe
output for a coal mine
1 Scope
This Standard specifies the product classification, technical requirements, test
methods, inspection rules, mark, packaging, transportation and storage of direct
current power supply with intrinsically safe output for a coal mine.
This Standard applies to direct current power supply with intrinsically safe output for a
coal mine (hereinafter referred to as DC power supply).
2 Normative references
The provisions in following documents become the provisions of this Standard through
reference in this Standard. For dated references, the subsequent amendments
(excluding corrigendum) or revisions do not apply to this Standard, however, parties
who reach an agreement based on this Standard are encouraged to study if the latest
versions of these documents are applicable. For undated references, the latest edition
of the referenced document applies.
GB/T 191 Packaging - Pictorial marking for handling of goods (GB/T 191-2000,
eqv ISO 780.1997)
GB/T 2423.1 Environmental testing for electric and electronic and electronic
products - Part 2.Test methods - Tests A. Cold (GB/T 2423.1-2001, idt IEC
60068-2-1.1990)
GB/T 2423.2 Environmental testing for electric and electronic products - Part 2.
Test methods - Tests B. Dry heat (GB/T 2423.2-2001, idt IEC 60068-2-1.1990)
GB/T 2423.3 Basic environmental testing procedures for electric and electronic
products - Test Ca. Damp heat, steady state (GB/T 2423.2-1992, eqv IEC
68-2-3.1984)
GB/T 2423.4 Basic environmental testing procedures for electric and electronic
products - Test Db. Damp heat, cyclic (GB/T 2423.4-1993, eqv IEC 68-2-3.1980)
GB/T 2423.5 Environmental testing for electric and electronic products - Part 2.
Test methods - Test Ea and guidance. Shock (GB/T 2423.5-1995, idt IEC
68-2-27.1982)
GB/T 2423.10 Environmental testing for electric and electronic products - Part 2.
Test methods - Test Fc and guidance. Vibration (Sinusoidal) (GB/T 2423.10-1995,
idt IEC 68-2-6.1982)
3 Product classification
3.1 Model
Model of product shall be in accordance with the specifications of MT/T 286.
3.2 Classification
3.2.1 According to explosion proof type.
3.2.2 According to operating principle.
3.2.3 According to output function.
4 Technical requirements
4.1 General requirements
DC power supply shall meet the requirements of this Standard, MT/T 1004, AQ 6201,
etc., and shall be produced according to drawing and technical documents approved
by specified procedure.
4.2 Environmental condition
4.3 Rated power supply condition
4.3.1 Source voltage. in accordance with Table 3.
4.3.2 Source frequency. 50 Hz, permissible deviation is ± 5%.
4.3.3 Harmonic wave. not more than 10%.
4.4 Main technical parameters
4.4.1 AC rated input voltage
AC rated input voltage shall meet input of 127 V and 220 V, it can also be chosen from
36 V, 127 V, 380 V, 660 V, 1140 V, etc.
4.5 Main functions
4.5.1 It shall have input and output power supply indication function.
4.5.2 It shall have current-limiting, voltage limiting and short circuit protection function,
thus automatic recovery can be made after fault is removed.
4.5.3 AC power supply with standby battery.
4.6 Structure
4.6.1 Fasteners shall have measures that avoid automatic loose.
4.8 Protective function of enclosure
Protective function of enclosure shall be in accordance with GB 3836.1 ~ GB 3836.4,
GB 3836.9, GB 12173 and other relevant standards.
4.9 Electric safety
4.9.1 Insulation resistance between circuit with power of DC power supply and
grounding (or enclosure) shall be in accordance with Table 4.Measurement locations
shall be specified in relevant standards.
4.14.4 AC power supply shall pass storage in low temperature working test; the main
technical parameters, functions and appearance shall not be below requirements of
this Standard.
4.15 Explosion-proof performance
AC power supply of explosion proof type shall be in accordance with the relevant
specifications of GB 3836.1 ~ GB 3836.4 and GB 3836.9, which shall have dual or
multiple current-limiting, voltage limiting and circuit protection function.
4.16 Performance of mining general type
Performance of mining general type shall be in accordance with the specifications of
GB 12173.
4.17 Intrinsically safe parameters
4.17.1 The highest output voltage shall meet requirements of intrinsically safe
explosion proof and shall be specified in relevant standards.
4.17.2 Maximum output current shall meet requirements of intrinsically safe explosion
proof and shall be specified in relevant standards.
5 Test methods
5.1 Environmental conditions
Unless otherwise specified in environmental test and relevant standards, test shall be
conducted in the following environmental conditions.
5.2 Main technical parameters and main function test
5.2.1 Measuring apparatus and equipment
5.2.1.1 General requirements for measuring apparatus and equipment
5.2.1.2.3 Artificial load. Adjust the artificial load to obtain load current, maximum
output current and circuit current that are needed by AC power supply output test.
5.2.1.2.4 Voltage regulator. it shall be in accordance with requirements of relevant
standards.
5.2.1.2.5 Oscilloscope, storage oscilloscope and video milli-voltmeter. it shall meet
requirements of relevant standards.
5.2.2 Test circuit
Connect test equipment according to figure 1, S1 and S2 in figure are single-phase
switches.
Figure 1 Test circuit
5.2.3 Test steps
5.2.3.5 Current limiting and short circuit protection function
SET source voltage as specified maximum value, ADJUST artificial load to make load
current gradually increase to output short circuit. OBSERVE ampere meter (A), the
maximum current is maximum output current of AC power supply, final indicating
value is short circuit current of AC power supply. REMOVE over-current and
short-circuit faults, INSPECT whether AC power supply can recover by itself or not.
CARRY out test for 5 times continuously.
For multi-circuit output AC power supply, output of other circuits shall be rated load.
5.4 Appearance inspection
ADOPT visual inspection.
5.5 Enclosure protective performance inspection
Enclosure protective performance inspection shall be conducted in accordance with
the relevant specifications of GB 4208.
5.6 Measurement of insulation resistance
Measurement of insulation resistance shall be conducted in accordance with the
relevant specifications of MT 210.
5.10 Anti-interference test
Anti-interference test shall be conducted in accordance with the specifications of GB/T
17626.3-2006, GB/T 17626.4-1998 and GB/T 17626.5-1999.
5.11 Reliability test
Reliability test shall be conducted in accordance with the relevant specifications of
GB/T 5080.7, ADOPT fixed time test plan. Failure judgment shall be conducted in
accordance with the relevant specifications of 9.2 in GB/T 5080.1.
5.12 High temperature working test
High temperature test shall be conducted in accordance with relevant specifications of
GB/T 2423.2.AC power supply to be tested shall be at connection state for 2
continuous hours with a severity level of highest working environmental temperature.
5.16 Damp heat test
5.16.1 Damp heat test below mine shall be carried out according to relevant
specifications of GB/T 2423.4, severity level is +40°C, and period is 12 d.
Measurement and voltage withstand test of insulation resistance shall be carried out
in 2 h before completion of test (at stage of low temperature with high humidity). After
test, main technical parameters and main functions shall be inspected.
5.17 Vibration test
Vibration test shall be carried out in accordance with GB/T 2423.10, severity level
shall be in accordance with the specifications of Table 6.
6 Inspection rules
6.1 Inspection rules
Inspection consists of factory-exit inspection and type inspection.
6.2 Factory-exit inspection
6.2.1 AC power supply shall be carried out for factory-exit inspection. Qualified
products shall be given certificate.
6.3 Type inspection
6.3.1 Type inspection shall be carried out when one of the following circumstances
occurs.
6.3.2 Inspection items shall be in accordance with the specifications of Table 8.
6.3.5 When batch number is more than 50, sampling inspection shall be carried out
according to GB/T 2829-2002.Choose one-time sampling scheme; judgment level is
III; rejectable quality level (RQL) is not more than 40.Specified RQL of A item is
usually below that of B item; specified RQL of C item is usually more than that of B
item. For type A item, if one-item is unqualified, then the whole batch is judged as
unqualified products, for B- and C-item, unqualified quantities determined shall be in
accordance with relevant standards.
7 Marking, packaging, transportation and storage
7.1 Marking
7.1.1 Product marks
7.1.1.1 Explosion-proof-type AC power supply shall have MA safety mark.
7.1.2 Packaging marks
7.1.2.1 Mark of packaging, storage and transportation shall be in accordance with the
specifications of GB/T 191.
7.1.2.2 Characters and marks written in external packing box shall at least include.
7.2 Packaging
7.2.1 Packaging pattern of AC power supply shall be in accordance with the relevant
specifications of nation and industries, and shall be specified clearly in relevant
standards.
7.2.2 Accompanying documents shall include.
7.3 Transportation
Avoiding rain and snow, AC power supply after packaging is suitable for various
transportation modes such as water transportation, land transportation and air
transportation.
......
Source: Above contents are excerpted from the full-copy PDF -- translated/reviewed by: www.ChineseStandard.net / Wayne Zheng et al.
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