MT/T 1078-2008 English PDF (MTT1078-2008)

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MT/T 1078-2008: Direct current power supply with intrinsically safe output for a coal mine
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 
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)
GB/T 2829-2002 Sampling procedures and tables for periodic inspection by
attributes (Apply to inspection of process stability)
GB 3836.1 Electrical apparatus for explosive gas atmospheres - Part 1. General
requirements (GB 3836.1-2000, eqv IEC 60079-0.1998)
GB 3836.2 Electrical apparatus for explosive gas atmospheres - Part 2.
Flameproof enclosure “d” (GB 3836.2-2000, eqv IEC 60079-1.1990)
GB 3836.3 Electrical apparatus for explosive gas atmospheres - Part 3.
Increased safety “e” (GB 3836.3-2000, eqv IEC 60079-7.1990)
GB 3836.4 Electrical apparatus for explosive gas atmospheres - Part 4. Intrinsic
safety “i” (GB 3836.4-2000, eqv IEC 60079-11.1999)
GB 3836.9 Electrical apparatus for explosive gas atmospheres - Part 9.
Encapsulation “m”
GB 4208 Degrees of protection provided by enclosure (IP code) (GB 4208-1993,
eqv IEC 529.1989)
GB/T 5080.1-1986 Equipment reliability testing General requirements (idt
605-1.1978)
GB/T 5080.7 Equipment reliability testing Compliance test plans for failure rate
and mean time between failures assuming constant failure rate (GB/T
5080.7-1986, idt IEC 605-7.1978)
GB/T 10111 Methods for random sampling by utilizing dices of random number
GB 12173 Mining electrical apparatus for non-hazardous area (GB 12173-1990,
neq ROCT 24754.1981)
GB/T 17626.3-2006 Electromagnetic compatibility - Testing and measurement
techniques - Radiated radio-frequency electromagnetic field immunity test (idt
IEC 61000-4-3.1995)
GB/T 17626.4-1998 Electromagnetic compatibility - Testing and measurement
techniques - Electrical fast transient/burst immunity test (idt IEC 61000-4-4.1995)
GB/T 17626.5-1999 Electromagnetic compatibility - Testing and measurement
techniques - Surge immunity test (idt IEC 61000-4-5.1995)
AQ 6021 General technical requirements for safety and supervision system of
coal mine
MT 210 Basic test methods of communication, inspection and control of electric
and electronic products of coal mine
MT/T 286 Planning and management methods for communication and
automation of products of coal mine
MT/T 1004 General technical requirements for safe production and supervision
system of coal mine
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.
a) Mining flameproof and intrinsically safe type;
b) Ground common and mining intrinsically safe type;
c) Mining general and intrinsically safe type;
d) Mining casting and intrinsically safe type.
3.2.2 According to operating principle.
a) Linear DC power supply;
b) Switching mode DC power supply;
c) Mixed mode DC power supply (linear and switching mode).
3.2.3 According to output function.
a) Single-circuit output;
b) Multi-circuit output.
3.2.4 According to standby battery.
4.4.5 Working hours and transfer time of standby power supply
For DC power supply with standby battery, the working hours of its standby battery
shall not be less than 2 h. The transfer time shall not have impact on power receiving
equipment and shall be specified in relevant standards.
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.
a) It shall have standby power supply indication;
b) It shall use floating charge, with overcharge and over discharge protection.
4.6 Structure
4.6.1 Fasteners shall have measures that avoid automatic loose.
4.6.2 Mental parts shall be implemented with anti-rust and anti-corrosive treatment.
4.6.3 Requirements for other structures indication function are in accordance with GB
3836.1 ~ GB 3836.4, GB 3836.9, GB 12173 and other relevant standards.
4.7 Appearance
4.7.1 Surface of DC power supply shall not have obvious indenture, scratch, crack
and deformation; surface coating and plating shall be uniform, without blister, crack
and falling.
4.7.2 Mental parts shall not have corrosion and other mechanical damage.
4.7.3 Switch and button shall operate flexibly; parts shall be tight; pluggable moving
parts shall be flexible.
4.7.4 Parameter light with different functions shall have different colors; symbols and
characters of explanation function and all marks of DC power supply shall be clear
and installed tightly.
4.7.5 Other requirements for appearance shall be in accordance with GB 3836.1 ~ GB
3836.4, GB 3836.9, GB 12173 and other relevant standards.
4.8 Protective function of enclosure
AC power supply shall be conducted for working stability test, in which time of
power-on test shall not be less than 48 h, and the main technical parameters and
func...