Some standard content:
National Standard of the People's Republic of China
Mining flameproof movable substations
Mining flameproof movable substations Part I General
1 Subject content and scope of application
GB8286-1996
Replaces GB 8286. 1~~8286.5:87
This standard specifies the rated values, technical requirements, inspection and tests of mining flameproof mobile substations (hereinafter referred to as mobile substations) and their four components, namely: mining flameproof dry-type transformers (hereinafter referred to as dry-type transformers), high-voltage load switches for mining flameproof mobile substations (hereinafter referred to as high-voltage load switches), high-voltage cable connectors for mining flameproof mobile substations (hereinafter referred to as high-voltage cable connectors) and low-voltage feeder switches for mining flameproof mobile substations (hereinafter referred to as low-voltage feeder switches). This standard applies to mobile substations and their special dry-type transformers, high-voltage load switches, high-voltage cable connectors and low-voltage feeder switches.
If only the parts of the mobile substation transformer, high-voltage load switch, high-voltage cable connector, and low-voltage feeder switch that are connected to each other are changed and used separately, these products can also refer to this standard. 2 Reference standards
GB19190 Packaging, storage and delivery diagrams
GB311.1-83 Insulation coordination of commercial voltage transmission and transformation equipment GB311.2~311.6-83 High voltage test technology GB763--90 Heat generation of AC high-voltage electrical appliances during long-term operation GB2706-89 Dynamic thermal stability test method of AC high-voltage electrical appliances GB/T2900.1-92 Basic terms of electrical terminology GB2900.15-82 Electrical terminology Transformer, mutual inductor, voltage regulator, reactor GB/T 2900.18—92 Electrical terms Low voltage electrical appliances GB/T2900.19-94 Electrical terms High voltage test technology and insulation coordination GB/T2900.20-94 Electrical terms High voltage switchgear GB2900.35—83 Electrical terms Explosive atmosphere explosion-proof electrical equipment GB3309—89 Mechanical tests of high voltage switchgear at room temperature GB3804—903 General requirements for 63kV AC commercial load switches
GB3836.1—83 Explosion-proof electrical equipment for explosive atmospheres GB3836.2—83 Explosion-proof electrical equipment for explosive atmospheres Gas equipment Flameproof electrical equipment d" GB6450-861 type power transformer
GB11022-89 General technical conditions for high-voltage switchgear JB3956-85 Explosion-proof feeder switch for mining
Approved by the State Administration of Technical Supervision on March 31, 1996 and implemented on December 1, 1996
3 Terminology
GB8286-1996
The following terms apply to this standard, and the local terms are GB/T2900.1. GB2900.15, GB/T2900.18. GB2900.19, GB/T 2900.20 and GB2900.35. 3.1 Flameproof mobile substation for mines
A kind of power supply and transformation equipment used in coal mines, a mobile complete set composed of four parts: dry-type transformer, high-voltage load switch, high-voltage cable connector and low-voltage feeder switch. 3.2 Flameproof/type transformer for mines
Dry-type transformer with flameproof enclosure.
3.3 High-voltage load switch for explosion-proof mobile substation for mines The high-voltage side supporting device of the mobile substation is composed of a knife switch that can be operated with load and a flameproof enclosure (special load switch). Under normal circumstances, it is mainly used to open and close no-load dry-type transformers. Device, in special cases, with load disconnect, 3.4 High-voltage cable connector for explosion-proof mobile substation for mines, connects the rubber-sheathed cable for mines to the high-voltage load switch with a flameproof enclosure. 3.5 Low-voltage feeder switch for explosion-proof mobile substation for mines, supporting device on the low-voltage side of the mobile substation. Under normal conditions, the electrical equipment is not frequently switched on and off and plays a protective role, that is, when there is an over-cut, short-circuit, under-voltage or power-off below the specified value in the circuit, the switch with a flameproof enclosure can automatically disconnect the circuit.
4 Technical requirements
4.1 Conditions of use
Normal conditions of use:
a. Altitude not exceeding 1000 m;
b. Ambient temperature:
Highest temperature +40℃
Highest half-day average temperature
Highest annual average temperature +20℃
Lowest temperature -5℃
c. Relative air humidity does not exceed 95% (at +25℃) + in mines with mixed gas and coal dust and explosion hazard; d.
No strong turbulence, vibration and the inclination from the vertical plane does not exceed 15°; e.
f. No gas and steam that can corrode metal and damage insulation; g. No place with dripping water;
h. The waveform of the power supply voltage is similar to a sine wave; i. The three-phase power supply voltage is approximately symmetrical.
Let; If the altitude exceeds 1000m, the temperature rise and insulation water level shall be in accordance with the relevant provisions of the following sections. 4.2 Rated value
4.2.1 Rated capacity
The rated capacity of the mobile substation refers to the rated capacity of the dry-type transformer, which is based on the operating conditions specified in 4.1 of this article and is expressed as the product of the rated voltage, rated current and phase coefficient 3 meters. Rated capacity is 100 kVA 200 kVA. 315 kVA. 400 kVA. 500 kVA, 630 kVA, 800 kVA. 1 000 kVA 1 250 kVA
4.2.2 Rated voltage
The rated voltage of the mobile substation is:
Secondary voltage 6000V. 10000V;
GB8286-1996
Secondary voltage 400 (380) V, 693 (660) V. 1200 (1 110) V Note: The voltage in brackets is the corresponding rated working voltage of the low-voltage switch. 4.2.3 Rated frequency
The rated frequency is 50 Hz.
4.3 Insulation level
4.3.1 The insulation level of the mobile substation shall be in accordance with the provisions of Table 1. Table 1
Rated voltage, V
10:000
Rated short-time rated withstand voltage (effective value), kV4.2
4.3.2 When the mobile substation has completely withstood the insulation test specified in Table 1, and when the test is repeated thereafter, the test voltage shall be reduced to 85% of the value specified in Table 1.
4.4 Wetness performance
Mobile substations have wetness requirements, and their four components shall be subjected to wet heat tests in accordance with the provisions of 5.3.5 of this article. 4.5 Flanges
4.5.1 The flange dimensions of the dry-type transformers with rated primary voltages of 6kV and 10kV and low-voltage load switches and the ten-type transformers with rated primary voltages of 6kV and 6kV and high-voltage load switches shall comply with the provisions of Figure 1. The flange dimensions of the dry-type transformers with rated primary voltages of 10kV and high-voltage load switches shall comply with the provisions of Figure 2. 4.5.2 The flange dimensions of the high-voltage load switches with rated voltages of 6kV and 10kV connected to the high-voltage cable connector shall comply with the provisions of Figures 3 and 4 respectively.
Note: The high-voltage load switch with rated voltage of 10kV can also be connected to the power supply through the junction box. 550
110110
Flameproof enclosure
GB 8286--1996
The structure and parameters of the flameproof enclosure of the four components of the mobile substation shall comply with the relevant provisions of GB3836. 5 Test methods and inspection rules
5.1 Inspection
The four components of the mobile substation shall be inspected by the inspection unit designated by the national labor safety department. The inspection procedure shall be in accordance with the provisions of Chapter 31 of GB3836.1.
5.2 Routine tests
5.2.1 Each mobile substation shall be subjected to the following routine tests: a. Check the flameproof gaps between the high-voltage load switch, the low-voltage feeder switch and the dry-type transformer, and between the high-voltage load switch and the high-voltage cable connector according to the requirements of Class 1 electrical equipment in Chapter 6 of GB 3836.2. Perform short-time power frequency withstand voltage test according to the provisions of 4.3 of this article. h.
Perform simulated electrical interlocking and emergency button action tests according to the provisions of 10.7.1 and 10.7.2 of the third part of this standard. .
d. Perform simulated interlocking action test according to the provisions of 10.7.3 of the third part of this standard. .
Perform short-circuit protection action test according to the provisions of 16.7 of the fifth part of this standard. r. Perform leakage action and grid capacitance current compensation adjustment test according to the provisions of 16.8 of the fifth part of this standard. 5.2.2 The shell of each of the four components of the mobile substation shall be subjected to static strength test in accordance with the provisions of GB 3836.2. 5.3 Type test
5.3.1 Type test is a representative test conducted to verify whether the product meets the specified technical conditions. It shall be conducted on the basis of qualified routine test1. When the rated value and structure of the product are exactly the same or have only minor differences, the type test of one product can represent them
5.3.2 If the type test of the four components of the mobile substation is qualified, it shall be regarded as the type test of the mobile substation. 5.3.3 Regular type test shall be conducted at least once every five years. 5.3.4 The four components of the mobile substation shall be subjected to relevant tests on the shell and shell parts in accordance with the provisions of Part 4 of GB3836.1 and Part 3 of GB3836.2.
5.3.5 The thermal test of each component of the mobile substation shall be in accordance with the provisions of Chapter 28 of GB3836.1. After 12 cycles of testing, the dry-type transformer must be able to withstand 85% of the power frequency withstand voltage and induction withstand voltage tests specified in its routine tests. After the high-voltage load switch and high-voltage relay connector have been tested for 21 cycles and the low-voltage feeder switch has been tested for 12 cycles, they must be able to withstand the power frequency withstand voltage test specified in their routine tests. 6 Marking, packaging, transportation and storage
GB8286-1996
6.1 The four components of the mobile substation must be marked with an invisible permanent embossed mark \Ex" on the obvious outside of the shell. 6.2 The four components of the mobile substation must be marked with nameplates in obvious places on the shell and reliably fixed. The nameplate must include the following contents:
a. Explosion-proof mark \ExdI\,
b. Explosion-proof certificate number;
Coal safety mark number.
6.3 The nameplate of the mobile substation shall be In addition to meeting the requirements of 6.2 of this section, the following contents shall also be included: a.
This standard number:
Product name;
Model and specifications:
Rated capacity, kVA;
Rated voltage, Vt
Rated current, A;
Rated frequency, Hz;
Number of phases:
Electrical wiring diagram;
Insulation level;
Gross weight,
Manufacturer name:
Factory number:
Factory Year and month of factory.
6.4 Nameplate and other signs on the shell.F- shall comply with the provisions of 30.5 of GB3836.1. 6.5 The packaging of the four components of the mobile substation shall ensure that the product and accessories will not be damaged, exposed to rain and corroded during transportation. 6.6 There shall be obvious product logos and packaging storage and transportation instructions on the packaging box. 6.6.1 Product logos shall include:
8. Product name, model, specifications and quantity: h. Box number:
Maximum external dimensions of the box (length × width × height) mm; d Net weight and gross weight, kg.
6.6.2 The packaging, storage and transportation signs shall comply with the relevant provisions of GB191. 6.7 The mobile substation and its four components shall not be subject to severe vibration, bumping and impact during transportation. 6.8 The mobile substation shall be stored in an environment with good air circulation, no rainwater intrusion, no exposure to the sun and no corrosive gas. Part II Mining Flameproof Dry-Type Transformer
7 Technical Requirements
7.1 Rated Value
7.1.1 Rated Capacity
The rated capacity is 50 kVA.100 kVA,200 kVA.315 kVA,400 kVA,500 kVA,630 kVA,800 kVA,1 000 kVA.1 250 kVA.
Note: The rated capacity of 50 kVA is only used as a dry-type transformer for single use; the other capacity can be made into the following CB 8286-1996 transformer for mine flameproof mobile substation. It can also be made into a dry-type transformer for single use. 7.1.2 Rated voltage
Primary voltage 6000V.10000V:
Secondary voltage 400V.693V,1200V
7.2 Insulation level
7.2.1 For dry-type transformers operating at an altitude not exceeding 1000m, the insulation level shall be in accordance with the provisions of Table 2. 2
Rated voltage
10 000
Rated short-time power frequency withstand voltage (effective value) kv
Rated full-wave lightning impulse withstand voltage (bee value) ky
4-type transformers are operated in areas between 1000m and 3000m above sea level, but when tested at locations with an altitude of no more than 10n above sea level, the rated short-time power frequency withstand voltage value is based on Table 2, and the altitude exceeding 1000m is increased by 6.25% for every 500m. 7.3 Voltage combination and connection group number
The voltage combination and connection group number of dry-type transformers shall be in accordance with the provisions of Table 3. Table:
Rated capacity, kVA
—Secondary voltage, V
Voltage combination
Tertiary voltage, V
693/430
1200/693
Note: When the secondary voltage is 693/4100V or 1200/693V, if it is not specified in the order, it is 693V or 1200V when leaving the factory. 7.4 Tap and tap voltage
The tap and tap voltage of the primary winding shall be in accordance with the provisions of Table 4. Table 4
Main tap
7.5 Rated performance data
Tap power, V
Connection group number
10 500
10:000
The rated performance data of type 1 transformer with primary rated voltage of 6000V shall be as specified in Table 5. Rated capacity, VA
No-load consumption
GB 8286—1996
Load consumption
Short-circuit impedance, %
The rated performance data of dry-type transformer with secondary rated voltage of 10000V shall be as specified in Table 6. Table 6
Rated capacity, kVA
No-load loss
Consumption, W
Load consumption
Short-circuit impedance, %
No-load current %
No-load current, %
Note: Load consumption and short-circuit impedance are the values at 145°C (reference humidity> when insulation heat resistance grade is H). If it is other insulation heat resistance grade, load consumption and short-circuit impedance should be corrected to the values at the corresponding reference temperature. 7.6 Cooling method and marking
The cooling medium of the winding and shell of the industrial transformer is air. The circulation type is natural circulation. The cooling method marking ANAN.
7.7 Temperature rise limit
7.7.1 For transformers operating at altitudes and ambient temperatures that meet the requirements of 4.1 in Part I, the temperature rise of the coil and core surface shall not exceed the limits listed in Part 7.
(Measured by the resistance method)
Core surface
GB8286-1996
Temperature of the insulation system, C
155(F)
Wet rise limit K
Temperature at which adjacent insulation materials are not damaged 7.7.2 When the ambient temperature at the operating location exceeds the limits of 4.1 in Part I When specified, the temperature limit of the purchased coil should be reduced. If the temperature exceeds the limit by less than or equal to 5°C, reduce by 5K; if the temperature exceeds the limit by more than 5°C but less than or equal to 10°C, reduce by 10K; if the temperature exceeds 10°C, the temperature rise limit shall be determined by negotiation between the manufacturer and the user. 7.7.3 When the altitude of the operating location exceeds 1000m, but the altitude of the test location does not exceed 1000m, the temperature rise limit of the coil in Table 7 shall be reduced by 2.5% for every 500m above the altitude exceeding 1000m. When the altitude of the operating location does not exceed 1000m, and the altitude of the test location exceeds 1000m, the measured temperature rise shall be reduced by 2.5% for every 500m above the altitude exceeding 1000m. The temperature rise limit of the coil of the dry-type transformer shall not be corrected if the ambient temperature of the high-altitude operation site provided by the user is lower than the provisions of 4.1 in the first chapter and meets the requirement of a decrease of 5% or more for every 1000m above sea level. 7.8 Temperature monitoring
A temperature monitoring element shall be installed on the upper part of the dry-type transformer housing. During normal operation, when the temperature exceeds a certain value due to external reasons, an alarm signal shall be issued.
7.9 Rollers
A flange roller shall be installed on the lower part of the dry-type transformer housing, with a gauge of 900mm and 600mm and can be submerged. 7.10 Interlocking
When the dry-type transformer is used independently as a flameproof dry-type transformer for mining, an emergency stop button must be installed to cut off the incoming high-voltage power supply in an emergency.
8 Test methods and inspection rules
In addition to the provisions of the first part, the routine tests, type tests and special tests of the F-type transformer shall also comply with the provisions of GB6450. 9 Marking
When the F-type transformer is used independently as a flameproof dry-type transformer for mining, its nameplate shall comply with the provisions of 2.2 in GB6450 in addition to the provisions of 6.2 in the first part.
Part III High-voltage load switches for flameproof mobile substations for mining 10 Technical requirements
10.1 Rated value
10.1.1 Rated voltage
The rated voltage is 6kV, 10kV.
10.1.2 Rated current
Rated current is 100A.200A.
10.1.3 Rated short-time withstand current (rated thermal stability current) and rated short-circuit duration (rated thermal stability time) Rated short-time withstand current and rated short-circuit duration shall be as specified in Table 8. Rated current, A
GB 82861996
Rated short-time withstand current, kA
10.1.4 Rated peak withstand current (rated dynamic stability current) Rated peak withstand current is 2.5 times rated short-time withstand current, 10.1.5 Rated breaking current
Rated short-circuit duration, 9
Rated active load breaking current is rated current; rated no-load transformer breaking current is no-load current of rated capacity 1250kVA dry-type transformer.
10.2 Insulation level
When the operating conditions meet the requirements of 4.1 in Part 1, the insulation level of the main circuit of the high-voltage load switch shall be in accordance with the requirements of Table 9. Table 9
Rated voltage
Maximum voltage
Rated short-time rated withstand voltage (effective value) to ground, between phases
The rated short-time power frequency withstand voltage of the auxiliary circuit is 2kV. Between isolation gaps
Rated full-wave lightning impulse withstand voltage (peak value) to ground, between phases
Between isolation gaps
Note, when the operating conditions do not meet the requirements of 4.1 in Part 1, the insulation level shall be corrected in accordance with the requirements of 3.3 and 3.4 in GB311.1. 10.3 Mechanical life
The high-voltage load switch shall be able to withstand mechanical opening and closing operations for 2000 times. 10.4 Mechanical characteristics
The mechanical characteristics of the high-voltage load switch are specified by the product technical conditions. 10.5 Operating mechanism
The human energy storage operating mechanism of the high-voltage load switch shall comply with the provisions of 5.3.12 and 5.3.14 in GB3804. 10.6 Main circuit resistance
The main circuit resistance is specified by the product technical conditions. 10.7 Interlocking
10.7.1 An electrical interlocking device shall be installed in the cavity of the high-voltage load switch box to cut off the incoming high-voltage power supply when the upper benefit of the box needs to be opened. 10.7.2 The high-voltage load switch shall be equipped with an emergency stop button to open the upper circuit breaker in an emergency. 10.7.3 The high-voltage load switch shall be equipped with auxiliary contacts for electrical interlocking with the low-voltage feeder switch to ensure that when the power is disconnected under normal circumstances, the low-voltage feeder switch is opened first and the high-voltage load switch is opened later. 10.8 Indicator
The high-voltage load switch is pre-equipped with obvious open and close position indication. 11 Test methods and inspection rules
11.1 Routine test
11.1.1 Mechanical characteristics test
The mechanical characteristics specified in the product technical conditions shall be in accordance with the requirements, such as: open and close direction, open and close speed, stroke, etc. The test shall be carried out in accordance with the relevant provisions of GB3309.
11.1.2 Mechanical operation test
CB 8286-1996
The high-voltage load switch shall be subjected to 10 open and close operation tests, and the test shall be carried out in accordance with the relevant provisions of GH3309. 11.1.3 Main circuit resistance measurement
It shall be carried out in accordance with the provisions of GB 763 and meet the requirements of 10.6 in this article. 11.1.4 Main circuit T-frequency withstand test
The high and low load switches must be able to withstand the short-time power frequency withstand voltage test (dry state) specified in Table 9. In addition to the requirements of GB311.2, GB311.4 and GB311.5, the test must also comply with the following provisions: a. The test product should be fully assembled according to the delivery situation, all accessories that affect the insulation performance of the product should be installed, and the adjustable phase distance and installation height to the ground should be the minimum values specified by the manufacturer. b
The voltage application position shall be in accordance with Table 10, see Figure 5. B4
Self-placement
Switch room
In the figure: A, a, B, bCc are the wiring diagrams of each phase Terminal, F is low voltage grounding wire, W is shell, Table 10
Test serial number
High voltage load switch status
Note, test number 1, 2 can be carried out together,
11.1.5 Auxiliary circuit short-time power frequency withstand voltage test
Voltage application position
Grounding position
AaCeFW
The short-time power frequency withstand voltage test of the auxiliary circuit of the high voltage load switch is carried out in accordance with the provisions of 7.1.10 of GB11022, and the test voltage is in accordance with the provisions of 10, 2 of this article.
11.2 Type test
11.2.1 11. 11.2.2 Mechanical life test
It shall be carried out in accordance with the provisions of 10.3 of this chapter and 6.6i.3 of CB3804. The number of opening and closing operations of the mechanical life is 2000 times, of which each 1.000 tests is an operation cycle, and a total of two cycles are carried out. 11.2.3 Temperature rise reduction test
It shall be carried out in accordance with the provisions of GR763.
11.2.4 Overtime withstand current and peak withstand current tests shall be carried out in accordance with the provisions of 10.1.3 and 10.1.4 of this chapter and GB2706. After the test, no damage that prevents continued normal operation shall occur. 11.2.5 Breaking test
GB 8286-1996
The rated active load breaking current test shall be carried out in accordance with 10.1.5 of this article and 5.2.12 and 6.5 of GB3804. The test method and procedure shall comply with 1 and 3 of Table 6 of GB3804, and the number of tests shall be based on the frequency type. The rated no-load transformer breaking current test shall be in accordance with 10.1.5 of this article, and the test shall be negotiated between the manufacturer and the user. 11.2.6 Insulation test
It shall be carried out in accordance with 7.1 of GB11022.
The test voltage shall be in accordance with 10.2 of this article. The test sample shall be in accordance with 11.1.4a of this article
The voltage application location shall be in accordance with Table 11, see Figure 5. Table 11
Test number
High load switch state
Voltage application position
Grounding position
BCheFW
ACacFW
ABalFw
RChheFW
ACabeFW
ABabeFw
ABCbcFW
ARCueFW
ABCabFW
Note: () When the front pressure test of the wheel separation break is carried out, except that the terminal corresponding to the pressure terminal should be grounded, the outer waste and other terminals can be properly insulated from the ground.
If the two side poles are symmetrical with respect to the middle pole and the shell, the test of test number 3.6.9 can be omitted: If each phase terminal is symmetrical with respect to the shell, the tests of test number 7, 8, 9 can be omitted. 12 Marking
In addition to complying with the provisions of 6.2 in Part I, the nameplate of the high-voltage load switch must also have the following information: product name;
model,
rated voltage, kV
rated current, A;
rated frequency, Hz:
Rated lightning impulse withstand voltage, kV:
Rated short-time withstand current, kA;
Rated short-circuit duration, 5+
weight, kgs
manufacturer,
factory serial number;
year and month of manufacturing.
13 Technical requirements
13.1 Rated value
13.1.1 Rated voltage
GB 8286—1996
Chapter 4 High-voltage cable connectors for flameproof mobile substations for mining use The rated voltage is 6 kV, 10 kV
13.1.2 Rated current
The rated current is 100 A, 200 A.
13.1.3 Rated short-time withstand current and rated short-circuit duration The rated short-time withstand current and rated short-circuit duration shall be in accordance with the provisions of Table 12. Table 12
Rated current
13.1.4 Rated peak withstand current
Rated short-time withstand current
The rated peak withstand current is 2.5 times the rated short-time withstand current. 13.2 Insulation level
Rated short-circuit duration
When the operating conditions meet the requirements of 4.1 in the first part, the insulation level between phases and between phases and between ground of the current-carrying part of the high-voltage cable connector shall be in accordance with the provisions of Table 13.
Rated voltage
Rated short-time withstand voltage (effective value) 20
Rated full-wave lightning impulse withstand voltage (peak) 40
Note: When the operating conditions do not meet the requirements of 4.1. in Part 1, the insulation level shall be corrected according to the requirements of 3.3 and 3.4 in GB 311.1. 13.3 Plug-in life
After the contact rod and the socket are plugged in and out 200 times, the temperature rise shall meet the requirements of GB763. 13.4 Plug-in force
The plug-in force between the contact rod and the socket is 30N~60N. 13.5 In addition to the socket and contact rod for connecting the main core wire and the grounding core wire, the commercial voltage cable connector shall also have a socket and contact for connecting the monitoring shielding core wire.
14 Test methods and inspection rules
14.1 Routine test
Short-time power frequency withstand voltage test shall be carried out in accordance with the provisions of 13.2 of this sieve. 14.2 Type test
14.2.1 Temperature rise testbzxZ.net
Carry out in accordance with the provisions of GB763.
14.2.2 Short-time rechargeable current and peak withstand current test shall be carried out in accordance with the provisions of 13.1.3 and 13.1.4 of Article 4 and GB 2706.
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