MT/T 1041.1-2007 English PDF (MTT1041.1-2007)

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MT/T 1041.1-2007: Specification for adjustable speed electrical equipment of shearer. Part 1: General specification
MT/T 1041.1-2007
MT
COAL INDUSTRY STANDARD OF
THE PEOPLE’S REPUBLIC OF CHINA
ICS 73.100.99
D 98
Filing No.. 22173-2007
Specification for adjustable speed electrical
equipment of shearer -- Part 1. General specification
ISSUED ON. OCTOBER 22, 2007
IMPLEMENTED ON. JANUARY 1, 2008
Issued by. State Administration of Work Safety
Table of Contents
Foreword ... 3 
1 Scope ... 4 
2 Normative references ... 4 
3 Terms and definitions ... 5 
4 Requirements ... 6 
References ... 18 
Specification for adjustable speed electrical
equipment of shearer -- Part 1. General specification
1 Scope
This Part of MT/T 1041 stipulates the terms and definitions of the adjustable
speed electrical equipment for the traction unit of shearer (hereinafter referred
to as “adjustable speed electrical equipment”), and the general specification,
i.e., all contents considered to be general requirements for all types of
adjustable speed electrical equipment, as well as items with a wide range of
meaning and common functional uses, e.g., explosion protection requirements,
temperature rise, dielectric properties, speed-adjustable (load) characteristics,
etc.
This Part applies to the following types of adjustable speed electrical equipment
for the traction unit of shearer.
a) speed-adjustable equipment by variable voltage variable frequency;
b) speed-adjustable equipment by electromagnetism;
c) switched reluctance drive.
2 Normative references
The provisions in the following documents become the provisions of this Part
through reference in this Part of MT/T 1041. For dated references, the
subsequent amendments (excluding corrections) or revisions do not apply to
this Part. However, parties who reach an agreement based on this Part are
encouraged to study if the latest editions of these documents are applicable.
For undated references, the latest editions apply to this Part.
GB/T 2423.4-1993 Basic environmental testing procedures for electric and
electronic products -- Test Db. Damp heat, cyclic
GB 3836.1-2000 Electrical apparatus for explosive gas atmospheres -- Part
1. General requirements (eqv IEC 60079-0.1998)
GB 3836.2-2000 Electrical apparatus for explosive gas atmospheres -- Part
2. Flameproof enclosure “d” (eqv IEC 60079-1.1990)
GB 3836.3-2000 Electrical apparatus for explosive gas atmospheres -- Part
3. Increased safety “e” (eqv IEC 60079-7.1990)
4.2.1 The adjustable speed electrical equipment shall be able to function
properly under the following environmental conditions.
a) Mounted on the shearer body (except for adjustable speed electrical
equipment located at the face end).
b) The ambient temperature is not higher than +40°C and not lower than -5°C.
c) The altitude is not higher than 2 000 m.
NOTE. For adjustable speed electrical equipment used at an altitude of above 2 000 m, air cooling and
dielectric strength degradation need to be considered. Adjustable speed electrical equipment for
operation under the above conditions can be designed and used according to the agreement of
the manufacturer and the user.
d) The relative humidity of the surrounding air is not more than 95% (at 25°C).
e) In a gas or vapor environment without damaging insulation.
f) Underground coal mining face with gas and explosive gas mixtures.
g) Environmental conditions for pollution class 3 (SEE 6.1.3.2 of GB/T
14048.1-2000).
h) Places where drip-proof measures are taken.
i) For the adjustable speed electrical equipment with water-cooled enclosure,
the inlet temperature of the cooling water shall not exceed +30°C, and the
inlet pressure of the cooling water shall not exceed 3MPa.
4.2.2 The overvoltage category (installation category) of adjustable speed
electrical equipment in the electrical system is Class E (SEE Annex H of GB/T
14048.1-2000).
4.3 Structure and explosion protection requirements
4.3.1 Flameproof enclosure
4.3.1.1 The enclosure of adjustable speed electrical equipment shall be made
of steel plates or cast steel.
4.3.1.2 The enclosure flameproof joint of adjustable speed electrical
equipment shall comply with the provisions of Clause 5 of GB 3836.2-2000.
4.3.1.3 The flameproof properties of the enclosure of adjustable speed
electrical equipment shall comply with the provisions of GB 3836.2-2000, and
shall withstand the enclosure pressure test specified in 15.1 and the non-
explosion test of internal ignition specified in 15.2 of GB 3836.2-2000.
4.3.1.4 The enclosure of adjustable speed electrical equipment shall be
subjected to static pressure test in accordance with the provisions of Clause 16
of GB 3836.2-2000 after finishing.
4.3.2 Cable entry device
equipment shall comply with the provisions of Clause 8 of GB 3836.2-2000.
Transparent parts shall be able to withstand the impact test specified in 23.4.3.1
of GB 3836.1-2000.
4.3.5 Grounding
The adjustable speed electrical equipment shall be provided with a grounding
connection in the wiring cavity. The grounding connection shall comply with the
provisions of Clause 15 of GB 3836.1-2000.
4.3.6 Interlocking
In order to maintain the flameproof adjustable speed electrical equipment, if an
interlocking device is used, the interlocking device shall comply with the
provisions of Clause 10 of GB 3836.1-2006.
4.3.7 Clearance and creepage distance
4.3.7.1 The clearance in the wiring cavity of adjustable speed electrical
equipment shall comply with the provisions of GB 3836.3-2000. The clearance
between different potentials is shown in Table 1.
4.3.7.2 The clearance between different potentials in the main cavity of
adjustable speed electrical equipment is shown in Table 2.
4.3.7.3 The creepage distance in the wiring cavity of adjustable speed
electrical equipment shall comply with the provisions of GB 3836.3-2000. The
creepage distance between different potentials is shown in Table 1. The class
of insulating materials selected for use in the wiring cavity shall not be lower
than Class E. The classification of insulating materials can be found in 4.4.1 of
GB 3836.3-2000.
4.3.7.4 The creepage distance between different potentials in the main cavity
of adjustable speed electrical equipment is shown in Table 2.
4.3.7.5 The clearance and creepage distance of the intrinsically safe circuit of
adjustable speed electrical equipment shall comply with the provisions of 6.4 of
GB 3836.4-2000.
The speed-adjustable range and characteristics of adjustable speed electrical
equipment shall comply with the requirements of Item 3 of Table 5 of MT/T 81-
1998. The conversion of the traction speed of shearer and the output shaft
speed of speed-adjustable equipment, as well as the conversion of the tractive
effort of shearer and the output torque of speed-adjustable equipment shall
comply with the requirements of Annex D of MT/T 81-1998.
4.4.3.2 Speed change rate
The adjustable speed electrical equipment shall have a speed change rate of
not greater than 2.5% at the rated torque (rated power) within the specified
speed-adjustable range. The speed change rate is expressed in δ1.
Where.
n10 - Actual speed of any speed signal given by adjustable speed electrical
equipment at the rated torque of 10% within the speed-adjustable range, in
revolutions per minute (r/min);
ne - Actual speed of adjustable speed electrical equipment when the output
torque reaches the rated torque under the same given speed signal
corresponding to n10, in re...