GB/T 8286-2017 PDF in English
GB/T 8286-2017 (GB/T8286-2017, GBT 8286-2017, GBT8286-2017)
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Mining flameproof movable substations
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[GB/T 8286-2005] Mining flameproof movable substations
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| GB 8286-1996 | English | 799 |
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Mining flameproof movable substations
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Mining flameproof movable substations--General
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Standards related to (historical): GB/T 8286-2017
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GB/T 8286-2017: PDF in English (GBT 8286-2017) GB/T 8286-2017
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 29.180
K 41
Replacing GB/T 8286-2005
Mining Flameproof Movable Substations
ISSUED ON: DECEMBER 29, 2017
IMPLEMENTED ON: JULY 01, 2018
Issued by: General Administration of Quality Supervision, Inspection
and Quarantine;
Standardization Administration of PRC.
Table of Contents
Foreword ... 4
1 Scope ... 6
2 Normative References ... 6
3 Terms and Definitions ... 7
4 Technical Requirements ... 8
4.1 Use conditions ... 8
4.2 Rated value ... 9
4.3 Insulation performance ... 10
4.4 Moisture resistance ... 10
4.5 Flange ... 10
4.6 Flameproof enclosure ... 11
5 Inspection Rules, Test Items and Methods ... 12
5.1 Inspection rules ... 12
5.2 Test items and methods ... 12
6 Marking, Packaging, Transportation and Storage ... 13
6.1 Marking ... 13
6.2 Packaging ... 14
6.3 Transportation ... 15
6.4 Storage ... 15
7 Mining Flameproof Dry-Type Transformer ... 15
7.1 Technical requirements ... 15
7.2 Inspection rules, test items and methods ... 19
7.3 Marking ... 20
8 High Voltage Load Switch for Mining flameproof Movable Substation ... 20
8.1 Technical requirements ... 20
8.2 Inspection rules, test items and methods ... 23
8.3 Mark ... 24
9 High-Voltage Vacuum Switch for Mining Flameproof Movable Substation .. 24
9.1 Technical requirements ... 24
9.2 Inspection rules, test items and methods ... 29
9.3 Marks ... 30
10 Cable Connector for Mining flameproof Movable Substation ... 31
11 Low-Voltage Feed Switch for Mining flameproof Movable Substation ... 31
12 Low-Voltage Protect Box for Mining flameproof Movable Substation ... 31
12.1 Technical requirements ... 31
12.2 Inspection rules, test items and methods ... 34
12.3 Marks ... 35
Bibliography ... 36
Mining Flameproof Movable Substations
1 Scope
This Standard specifies the terms and definitions, technical requirements, inspection
rules, test items and methods, marking, packaging, transport and storage of mining
flameproof movable substation (hereinafter referred to as movable substation) and its
components, namely the mining flameproof dry-type transformer (hereinafter referred
to as dry-type transformer), high-voltage load switch for mining flameproof movable
substation (hereinafter referred to as high-voltage load switch) or high-pressure
vacuum switch for mining flameproof movable substation (hereinafter referred to as
high-pressure vacuum switch), cable connector for mining flameproof movable
substation (hereinafter referred to as cable connector), and low-voltage feed switch for
mining flameproof movable substation (hereinafter referred to as low-voltage feed
switch) or low-voltage protect box for mining flameproof movable substation
(hereinafter referred to as low-voltage protective box).
This Standard is applicable to movable substation and its dedicated dry-type
transformer, high-voltage load switch or high-voltage vacuum switch, cable connector
and low-voltage feed switch or low-voltage protect box.
2 Normative References
The following documents are essential to the application of this document. For the
dated documents, only the versions with the dates indicated are applicable to this
document; for the undated documents, only the latest version (including all the
amendments) are applicable to this document.
GB/T 191 Packaging – Pictorial Marking for Handling of Goods
GB/T 311.1 Insulation Coordination – Part 1: Definitions, Principles and Rules
GB/T 1094.11 Power Transformers – Part 11: Dry-Type Transformers
GB/T 1984 High-Voltage Alternating-Current Circuit-Breakers
GB/T 1985 High-Voltage Alternating-Current Disconnector and Earthing Switches
GB/T 2900.1 Electrotechnical Terminology – Fundamental Terms
GB/T 2900.18 Electrotechnical Terminology – Low Voltage Apparatus
GB/T 2900.19 Electrotechnical Terminology – High-Voltage Test Technique and
Insulation Coordination
GB/T 2900.20 Electrotechnical Terminology – High-Voltage Switchgear and
Controlgear
GB/T 2900.35 Electrotechnical Terminology – Electrical Apparatus for Explosive
Atmosphere
GB/T 2900.95 Electrotechnical Terminology – Transformers, Voltage Regulators
and Reactors
GB/T 3309 Mechanical Test at Ambient Temperature for High-Voltage Switchgear
GB/T 3804 High-Voltage Alternating Current Switches for Rated Voltage above
3.6kv and less than 40.5kv
GB 3836.1 Explosive Atmospheres - Part 1: Equipment - General Requirements
GB 3836.2 Explosive Atmospheres - Part 2: Equipment Protection by Flameproof
Enclosures “d”
GB/T 11022 Common Specifications for High-Voltage Switchgear and Controlgear
Standards
GB/T 14048.1 Low-Voltage Switchgear and Controlgear - Part 1: General Rules
GB/T 16927.1 High-Voltage Test Techniques - Part 1: General Definitions and Test
Requirements
AQ 1043-2007 Mining Products Safety Label
JB/T 501 Test Guide for Power Transformers
JB/T 8739 Mine Explosion-Proof High-Voltage Distribution Device
MT 871 Mining Blast-Proof Switchgear with Vacuum Circuit Breaker for Low-
voltage Alternate Circuit
MT/T 947 Flameproof High-Voltage Cable Coupling Devices for Coal Mine
3 Terms and Definitions
For the purpose of this document, the terms and definitions given in GB/T 2900.1, GB/T
2900.18, GB/T 2900.19, GB/T 2900.20, GB/T 2900.35 and GB/T 2900.95 and the
following apply.
5 Inspection Rules, Test Items and Methods
5.1 Inspection rules
Each component of the movable substation shall be respectively inspected in
accordance with the provisions of the corresponding standards; the inspection
procedures shall be in accordance with the relevant provisions of GB 3836.1.
5.2 Test items and methods
5.2.1 Routine test
5.2.1.1 Each movable substation shall withstand the following routine test items:
a) Inspect the flameproof gas BETWEEN high-voltage load switch or high-voltage
vacuum switch, low-voltage feed switch or low-voltage protect box AND dry-type
transformer; and the flameproof gas BETWEEN high-voltage load switch or high-
voltage vacuum switch, low-voltage feed switch or low voltage protect box AND
cable connector according to the requirements of GB 3836.2;
b) Carry out short-time power frequency withstand voltage test according to the
requirements of GB/T 16927.1, and shall comply with the provisions of 4.3;
c) According to the different components of the movable substation and the
requirements for technical conditions of each product, inspect the routine test
report; and conduct connecting and disconnecting actions, and relevant tests
such as display, etc.
5.2.1.2 The enclosure of each component of the movable substation shall be subjected
to a static pressure test in accordance with the provisions of GB 3836.2.
5.2.2 Type test
5.2.2.1 The type test is a representative test that is conducted to verify whether the
product meets the specified technical requirements. It shall be carried out on the basis
of passing the routine test. When the products have the completely the same rated
values and structures or only have minor differences, the type test for one product may
represent them.
5.2.2.2 If the type test for each component of the mobile substation is qualified, the
type test for the movable substation shall be regarded as qualified.
5.2.2.3 Periodic type test shall be conducted at least once every five years.
5.2.2.4 Each component of the mobile substation shall be tested for enclosures and
enclosure components in accordance with the provisions of GB 3836.1 and GB 3836.2.
letter may be marked.
k) Short-circuit impedance;
l) Connection group label;
m) Cooling method;
n) Total mass, kg;
o) Name of manufacturing organization;
p) Exit-factory serial number;
q) Year of manufacture.
6.1.3 In addition to conforming to the provisions of 6.1.2, the nameplate of the movable
substation shall have the following contents:
a) Explosion-proof mark of "ExdIMb";
b) Explosion-proof certificate number;
c) Approval certificate number for safety marks.
6.1.4 The nameplate and other signs on the enclosure shall comply with the provisions
of GB 3836.1.
6.2 Packaging
6.2.1 There shall be an obvious product mark on the packing box. The product mark
shall include the following contents:
a) Product name, model, specifications and quantity;
b) Box number;
c) Maximum external dimensions of the cabinet (length × width × height), mm;
d) Net mass and gross mass, kg.
6.2.2 There shall be obvious packaging, storage and transportation indication marks,
which shall be in accordance with the relevant provisions of GB/T 191.
6.2.3 The packaging of the movable substation and its various components shall
ensure that the products and accessories not to be damaged, rained or corroded
during transportation.
make the cooling air temperature higher, the user shall clarify.
7.1.7.3 When the designed dry-type transformer is operated at an altitude of more than
1000m, but the test is carried out at a normal altitude, if there is no other agreement
between the manufacturer and the user, the temperature rise limit value given in Table
7 shall be, based on the part of the operation site where the altitude exceeds 1000m,
with every 500m as a level, reduced according to the following corresponding values:
a) For self-cooled dry-type transformers: 2.5%;
b) For air-cooled dry-type transformers: 5%.
If the test of the dry-type transformer is carried out at an altitude above 1000m and the
altitude at the installation site is below 1000m, the temperature rise limit shall be
corrected accordingly.
The temperature rise limit after the altitude correction shall be rounded off to the
nearest integer value (unit: K).
7.1.8 Temperature monitoring
Temperature monitoring components shall be installed on the upper part of the dry-
type transformer to facilitate temperature monitoring.
7.1.9 Roller
Flange rollers should be installed on the lower part of the dry-type transformer
enclosure, the gauge is 900mm or 600mm; according to user needs, other forms may
also be used.
7.1.10 Independent use requirements
When the dry-type transformer is used independently as a mining flameproof dry-type
transformer, an interlock device and an emergency stop button shall be installed to cut
off the incoming high-voltage power supply in an emergency; or a warning sign of
"strictly prohibited to open the cover with electricity" is set.
7.2 Inspection rules, test items and methods
Routine tests, type tests and special tests of dry-type transformers shall meet the
following requirements in addition to the provisions of Clause 5 and GB/T 1094.11,
JB/T 501:
a) Transformer capacity for short-circuit withstand capability test: When the primary
nominal voltage is 6kV and 10kV, and the secondary nominal voltage is 3450V,
a set of dry-type transformer with a capacity of 2500kVA and above or the
maximum capacity of the unit shall be tested. When the primary nominal voltage
and cannot represent other transformers. If special tests are required, the test circuit
and test procedures shall be negotiated by the user and the manufacturer.
8.1.5 Mechanical life
The high-voltage load switch shall be able to withstand mechanical opening and
closing operations for no less than 5000 times.
8.1.6 Mechanical characteristics
The mechanical characteristics of the high-voltage load switch shall comply with the
provisions of product technical conditions.
8.1.7 Operating mechanism
The maximum operating force of the human energy storage operating mechanism of
the high-voltage load switch shall be no greater than 250N.
8.1.8 Main-loop resistance
The main-loop resistance shall meet the requirements of the product technical
conditions.
8.1.9 Interlock
8.1.9.1 The cavity of the high-voltage load switch box shall be equipped with an
electrical interlock device, which can cut off the incoming high-voltage power supply
when the cover is opened.
8.1.9.2 The high-voltage load switch shall be equipped with an emergency stop button,
which can open the upward circuit breaker in an emergency.
8.1.9.3 The high-voltage load switch shall be equipped with auxiliary contacts for
electrical interlocking with the low-voltage feed switch to ensure that when the power
supply is disconnected under normal conditions, the low-voltage feed switch shall first
open and the high-voltage load switch shall then open.
8.1.10 Indicating device
The high-voltage load switch shall have obvious mechanical indication of opening and
closing positions.
8.1.11 Power supply lead-in device
The power supply lead-in device of the high-voltage load switch may use a cable
connector, but it shall conform to the provisions of GB 3836.1 and GB 3836.2.
9.1.3.3 Transient recovery voltage (TRV) related to the rated short-circuit
breaking current
The transient recovery voltage (TRV) related to the rated short-circuit breaking current
shall comply with the provisions of GB/T 1984.
9.1.3.4 Rated short-circuit making current
The rated short-circuit making current is equal to 2.5 times the root-mean-square value
of the AC component of the rated short-circuit breaking current.
9.1.3.5 Rated operation sequence
The rated operation sequence is: O-t-CO-t-CO; unless otherwise specified, otherwise
t = 3min.
9.1.4 Mechanical life
The mechanical life of the high-voltage vacuum switch is 10,000 times.
9.1.5 Mechanical interlock
The mechanical interlock of the high-voltage vacuum switch shall meet the following
requirements:
a) When the circuit breaker is in the closing position, the isolating switch cannot be
operated;
b) When the isolating switch is in the closing position, the box door cannot be
opened. Only when the isolating switch is opened in place (or reliably grounded),
the box door can be opened;
c) When the box door is in the opened position, the isolating switch cannot be closed;
d) For the spring energy storage mechanism, when the circuit breaker is in the
closing position, the energy storage closing operation can no longer be
performed.
9.1.6 Mechanical characteristics
The mechanical characteristics of the high-voltage vacuum switch are specified by the
product technical conditions, and shall include the following contents:
a) Rated contact stroke;
b) Overtravel;
c) Average closing speed;
cable connector, but it shall conform to the provisions of GB 3836.1 and GB 3836.2.
9.1.14 Isolating switch
The high-voltage isolating switch shall comply with the provisions of GB/T 1985.
9.2 Inspection rules, test items and methods
9.2.1 Routine test
9.2.1.1 Mechanical operation and mechanical characteristic test
The mechanical operation and mechanical characteristics test shall conform to the
provisions of product technical conditions, such as: synchronousness of opening and
closing, speed and stroke of opening and closing, etc.; the test shall be conducted in
accordance with the provisions of GB/T 3309.
9.2.1.2 Main-loop resistance measurement
The main-loop resistance measurement shall be carried out in accordance with the
provisions of GB/T 11022.
9.2.1.3 Main-loop power frequency withstand voltage test
The main-loop power frequency withstand voltage test shall be conducted in
accordance with the provisions of GB/T 1984.
9.2.1.4 Protection characteristic test
The protection characteristic test shall be conducted in accordance with the provisions
of JB/T 8739.
9.2.2 Type test
9.2.2.1 Rated short-circuit making and breaking current test
The rated short-circuit making and breaking current test shall be carried out in
accordance with the provisions of GB/T 1984.
9.2.2.2 Mechanical life test
The mechanical life test shall be carried out in accordance with the provisions of GB/T
1984.
9.2.2.3 Temperature rise test
The temperature rise test shall be conducted in accordance with the provisions of GB/T
1984.
wiring diagram.
10 Cable Connector for Mining flameproof Movable
Substation
In addition to the connection size shall conform to the provisions of 4.5, the rest of the
performance shall conform to the provisions of MT/T 947.
11 Low-Voltage Feed Switch for Mining flameproof
Movable Substation
In addition to the connection size shall conform to the provisions of 4.5, the rest of the
performance shall conform to the provisions of MT 871.
12 Low-Voltage Protect Box for Mining flameproof
Movable Substation
12.1 Technical requirements
12.1.1 Rated value
12.1.1.1 Nominal voltage
The nominal voltage of a system is 380V, 660V, 1140V, 3300V.
12.1.1.2 Rated current
The rated current is 315A, 400A, 500A, 630A, 800A, 1000A, 1250A, 1600A, 2000A.
12.1.2 Insulation level
The insulation level of the low-voltage protect box is as specified in Table 13.
The control loop is 2kV.
When the operating conditions do not conform to the provisions of 4.1, then the
correction of insulation level can refer to GB/T 311.1.
The low-voltage power supply lead-out device may use a plug-in cable connector or a
fixed connection cable lead-in device.
12.2 Inspection rules, test items and methods
12.2.1 Routine test
12.2.1.1 Insulation test
If the nominal voltage of a system is 1.14kV and below, it shall be conducted in
accordance with the provisions of GB/T 14048.1. If the nominal voltage of a system is
3.3kV, it shall be conducted in accordance with the provisions of GB/T 11022.
12.2.1.2 Short-circuit protection, overload protection
If the nominal voltage of a system is 1.14kV and below, it shall be conducted according
to the provisions of MT 871. If the nominal voltage of a system is 3.3kV, it shall be
conducted according to the provisions of 9.2.1.4.
12.2.1.3 Leakage lockout and leakage protection
The leakage lockout and leakage protection test shall be carried out in accordance
with the provisions of MT 871.
12.2.1.4 Overvoltage and undervoltage protection
The overvoltage and undervoltage protection shall be carried out in accordance with
the provisions of 9.2.1.4.
12.2.1.5 Mechanical and electrical interlock
The Mechanical interlock adopts checking the plan review with the sample; electrical
lockout adopts checking the plan review with the actual operation of the energized
sample.
12.2.1.6 Short-time power frequency withstand voltage test
If the nominal voltage of a system is 1.14kV and below, the low-voltage protect box
shall be conducted according to the provisions of GB/T 14048.1. If the nominal voltage
of a system is 3.3kV, the low-voltage protect box shall be conducted according to the
provisions of GB/T 11022.
12.2.1.7 Protection characteristic test
If the nominal voltage of a system is 1.14kV and below, the low-voltage protect box
shall be conducted according to the provisions of MT 871. If the nominal voltage of a
system is 3.3kV, the low-voltage protect box shall be conducted according to the
provisions of JB/T 8739.
......
Source: Above contents are excerpted from the PDF -- translated/reviewed by: www.chinesestandard.net / Wayne Zheng et al.
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