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GB 50070-2020: Standard for design of electric power in mine
Status: Valid GB 50070: Evolution and historical versions
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Standard for design of electric power in mine
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Basic data | Standard ID | GB 50070-2020 (GB50070-2020) | | Description (Translated English) | Standard for design of electric power in mine | | Sector / Industry | National Standard | | Classification of Chinese Standard | P70 | | Classification of International Standard | 73.010 | | Word Count Estimation | 81,855 | | Date of Issue | 2020-02-27 | | Date of Implementation | 2020-10-01 | | Quoted Standard | GB 50029; GB 50052; GB 50055; GB 50431; GB/T 9089; GB/T 18039.4 | | Issuing agency(ies) | Ministry of Housing and Urban-Rural Development of the People's Republic of China; State Administration for Market Regulation | | Summary | This standard applies to all types of mine power design that are newly built, rebuilt and expanded except for petroleum mines. | GB 50070-2020: Standard for design of electric power in mine---This is a DRAFT version for illustration, not a final translation. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.) will be manually/carefully translated upon your order.
1 General
1.0.1 This standard is formulated in order to implement national laws, regulations and policies in mine power design, ensure life safety and equipment safety, achieve reliable power supply and distribution, save energy, be environmentally friendly, technologically advanced and economically reasonable.
1.0.2 This standard is applicable to the electric power design of all kinds of mines newly built, rebuilt and expanded except petroleum mines.
1.0.3 Mine power design scheme and equipment level should be reasonably determined according to mine scale, process characteristics, load nature, power consumption capacity and regional power supply conditions.
1.0.4 Mine power design should correctly handle the relationship between short-term and long-term development of mine power construction based on mine project scale, service life and development planning, focusing on the short-term and reasonably taking into account long-term construction. When conditions permit, capital construction should be combined with production power facilities.
1.0.5 In addition to complying with this standard, mine power design should also comply with the current relevant national standards.
2 terms
2.0.1 mining area substation
The substation that distributes power to the entire mining area or part of the mining area usually includes a number of mines, open-pit mines, ore dressing plants and their mining area administration, production management agencies, auxiliary and affiliated enterprises, etc.
2.0.2 surface main substation surface main substation
It is an enterprise power transformation and distribution center that is located on the ground of a mine or an open-pit mine, accepts and collects the external power supply of the enterprise, and has the function of completing all or part of the load distribution in the enterprise. Also known as the total step-down substation.
2.0.3 underground main substation underground main substation
Underground car parks or transportation lanes set at the main underground mining level, accept ground power from the mine, and have the ability to complete the full or partial load distribution function of the mining level (or sometimes including adjacent mining levels) Underground substation and distribution center. Also known as underground central substation.
2.0.4 working section substation of mining area substation
A substation that distributes power to one or more underground mining area-wide loads.
2.0.5 Comprehensive utilization of mine resources plantofutilizingcastoffforby-productinmineforgeneratingelectricity
Enterprises that use low calorific value waste generated during mine production and processing and mining by-products such as coal bed methane as fuel to produce electricity and heat.
2.0.6 Mining electric apparatus for non-explosive atmospheres
It meets the specific safety requirements of mines and is suitable for electrical equipment in underground normal non-explosive environments.
2.0.7 Underground main ground electrode undergroundmainearthedelectrode
The metal plate grounding electrode set in the main and auxiliary water tanks in the well.
2.0.8 Underground local ground electrode undergroundlocalearthedelectrode
In addition to the main grounding electrode, the grounding electrode is set up in the underground or at a single place where electrical equipment is installed.
2.0.9 Underground protective conductor undergroundprotectiveconductor
A conductor set for underground electrical safety.
2.0.10 underground earth device underground earth device
The sum of downhole ground electrodes, downhole ground conductors and downhole ground busbars. Among them, the grounding device containing the underground main grounding electrode is called the main grounding device, and the grounding device containing the underground local grounding electrode is called the local grounding device.
2.0.11 Underground grounding network undergroundgeneralearthnetwork
Connect multiple scattered main grounding devices and local grounding devices with grounding conductors to form a complete grounding system with good electrical conductivity between each other at one or more mining levels or local areas in the well.
2.0.12 undergroundconventionalprospectivetouchvoltagelimit undergroundconventionalprospectivetouchvoltagelimit
In order to ensure personal safety, the maximum value of the expected contact voltage that is allowed to exist for an unlimited time in the underground environment.
3 basic rules
3.0.1 Mine power load should be divided into primary load, secondary load and tertiary load, and the load division should meet the following requirements.
1 The following conditions shall be classified as Class I loads.
1) There are main drainage pumps for mines in submerged dangerous environments and drainage pumps for downhill mining;
2) The main ventilator of a mine in a dangerous environment where there is an explosion or serious damage to human health;
3) Shaft hoists for frequent lifting of personnel in mines;
4) Drainage pumps for open-pit mines in submerged dangerous environments or drainage pumps for drainage in shafts;
5) Other equipment that should be regarded as a first-class load according to the current relevant national standards.
2 The following situations should be classified as secondary loads.
1) A single piece of equipment or a group of interrelated equipment directly related to mineral mining, transportation, lifting, processing and outbound transportation in large mines except for the primary load;
2) Underground fixed lighting equipment without portable lighting fixtures, or emergency lighting equipment used to ensure the continuation of normal activities in workplaces with primary loads on the ground and secondary loads in large mines;
3) Power supply equipment for mine communication and safety monitoring devices;
4) Drainage pumps for large open-pit mines;
5) Signal power supply equipment at railway stations;
6) Other equipment that should be regarded as secondary load according to the current relevant national standards.
3 The electrical equipment that does not belong to the first-level load and the second-level load shall be divided into the third-level load.
3.0.2 The mine power supply should be taken from the substation of the regional power system, the substation of the mining area, the power plant of the coal-electricity joint operation or the self-provided power plant of the mining area (mine). When it is difficult to obtain from the above-mentioned substations or power plants, it can also be obtained from the substations of neighboring enterprises.
3.0.3 Mine power supply and power lines shall comply with the following regulations.
1 A mine with a primary load should be powered by dual power sources; when one power supply is interrupted, the other power supply should not be damaged at the same time, and the capacity of the power supply should at least ensure the mine’s entire primary load power demand, and should meet the mine’s secondary load power demand.
2 Large and medium-sized mines should be powered by two power lines; when any one of the two power lines is interrupted, the other power line should ensure the supply of all primary and secondary load power requirements.
3 Small mines without primary load can be powered by primary power lines.
3.0.4 The setting of self-provided power supply in mining areas (mines) shall be based on regional power development planning, overall mining area planning, comprehensive utilization planning, relevant national industrial policies, industry access policies, and environmental and water resource protection policies, after technical and economic comparisons OK, and should meet one of the following conditions.
1 The mine is located far away from the power system, or it is difficult to obtain all the required power from the power system;
2 Mine production and processing produce enough low-calorific-value waste or coal-bed methane and other mining by-products for power generation as fuel, which is suitable for the construction of power plants for comprehensive utilization of mine resources;
3 There is a reliable heat load in or near the mine, and it has the conditions for centralized heating, which is suitable for the development of combined heat and power projects;
4 Possess the conditions for developing other distributed power sources.
3.0.5 The power supply voltage of the mine power supply should be 10kV ~ 110kV; when it is determined to be reasonable through technical and economic comparison, other grades of voltage can be used. When the economic and technical indicators of the two voltages are not much different, the higher level voltage should be used.
3.0.6 For mining projects where the mine power supply voltage is greater than or equal to 20kV, the primary power distribution voltage of the mine should be 10kV; when it is determined to be reasonable through technical and economic comparison, 6kV or partial 20kV and above voltage can also be used.
6 The distance from the mining boundary of the open-pit mine shall not be less than.200m; the distance from the standard gauge railway shall not be less than 40m.
3.0.13 When selecting the route of mine fixed high-voltage overhead power lines, in addition to complying with the relevant regulations of the state and the power industry, the following regulations should also be complied with.
1 It should not be erected in the blasting operation area and the unstable waste discharge area, and should keep an appropriate safe distance from them.
2 It is advisable to use the well (mine) field boundaries, fault pillars or other ore pillars; when no ore pillars are available, the route should reduce the length of the section passing through the mine surface and avoid passing through the initial subsidence area.
3 When it is necessary to pass through the subsidence area due to conditions, the length of the road section passing through the subsidence area should be reduced, and there should be a sufficient safety distance between the two power lines passing through the subsidence area and other necessary safety measures should be taken; the same pole (tower) The erected mine power lines should not pass through areas where subsidence may occur and subsidence areas that have not been stabilized.
4 mine underground
4.1 Power supply and distribution system
4.1.1 The setting of the underground substation shall be determined according to factors such as the ground power distribution system, underground production scale and power distribution range, drainage method and mining method, and shall comply with the following regulations.
1 The underground main substation should be installed at the main mining level as the substation and distribution center of this level or several adjacent mining levels; adjacent to each other.
2 The underground main substation should be directly powered by the ground main substation.
3 Substations in the mining area with large loads or far away from the underground main substation, the main drainage pump room substation, etc., can be directly powered by the mine ground main substation or other substations located on the mine ground.
4.1.2 The selection of underground power distribution voltage and electrical equipment voltage should meet the following requirements.
1 The high-voltage distribution voltage of the underground power network should adopt the same level of distribution voltage as the ground high-voltage power network, and the following conditions should be met.
1) There is an explosion-hazardous environment underground, and the voltage shall not be greater than 10kV;
2) If there is no explosion hazard underground, 10kV should be used; when it exceeds 10kV, special safety measures should be taken.
2 The low-voltage distribution voltage of the underground power grid should be 380/660V or 1140V, and 220/380V for small mines.
3 The power distribution voltage of the comprehensive mechanized mining face can be 1140V or 3300V, and special safety measures should be taken when the voltage exceeds 3300V.
4 The voltage of handheld electrical equipment should not exceed 127V.
5 When safety needs, no more than 36V voltage can be used.
4.1.3 The grounding type of the underground low-voltage power distribution system shall meet the following requirements.
1 There is an explosion-hazardous environment underground, and an IT system should be used.
2 If there is no explosion hazard underground, IT system should be used; when 220/380V is used, TN-S system can also be used.
3 When the IT system is adopted, the live part of the power supply terminal of the power distribution system shall not be grounded or be grounded through high impedance, and when a fault with negligible impedance occurs between the phase conductor of the power distribution system and the exposed conductive part for the first time, the fault current shall not Should be greater than 5A.
4.1.4 The power supply and power supply circuit settings of the underground substation shall meet the following requirements.
1 The total number of circuits of the power cables leading from the ground to the main underground substation and other underground substations shall not be less than two circuits; when any circuit stops power supply, the power supply capacity of the remaining circuits shall be able to bear the full load of the underground.
2 The underground main substation, main drainage pump room substation and other substations with primary load shall be powered by dual power sources.
3.The substations that distribute power to large mines for underground mineral mining and transportation loads should use dual-circuit power supply.
4.1.5 For the power supply cables leading into underground substations via overhead lines on the ground, lightning protection devices shall be installed at the joints between overhead lines and cables.
4.1.6 Automatic reclosing devices shall not be installed on the ground-to-underground power distribution lines and other underground lines.
4.1.7 In one of the following situations, mobile substation power distribution should be adopted.
1 Power distribution of comprehensive mechanized mining face;
2 When it is difficult or uneconomical to distribute power from fixed substations such as mining area substations;
3 When there is no suitable low-voltage power supply available for power distribution in the excavation of a single-headed alley.
4.1.8 Underground lighting voltage should meet the following requirements.
1 The fixed lighting voltage of the main roadway can be 220V or 127V;
2 36V should be used in the patio and between the patio and the mining face;
3 The mining face should use 36V, and 127V can be used when choosing mine explosion-proof lamps;
4 Line lamp voltage should not be greater than 36V.
4.2 Electrical equipment and its protection
4.2.1 The type selection of underground electrical equipment shall meet the following requirements.
1 For mines in non-explosive hazardous environments, general mine-used electrical equipment should be used;
2 Mine with explosion hazard environment shall be implemented in accordance with the current relevant national standards;
3 Oil-immersed electrical equipment should not be used underground.
4.2.2 The underground main substation and the distribution transformer with the low-voltage primary load substation shall not be less than 2; when one of them stops running, the rest of the transformers shall be able to bear the full load.
4.2.3 The main underground substation and other substations that receive power directly from the ground should be equipped with circuit breakers for the power supply line, bus section and feeder line.
4.2.4 Except for the underground main substation and the substation directly receiving power from the ground, the configuration of high-voltage circuit breakers in other substations shall meet the following requirements.
1 In the substation with dual power supply incoming lines, a power incoming line circuit breaker should be installed; when the two circuits of power supply are powered at the same time, the busbar should be segmented and a segmental circuit breaker should be installed;
2 For a substation with a single power supply incoming line, when there are more than two transformers or there are high-voltage outgoing lines, an incoming circuit breaker should be installed;
3 The feeder line should be equipped with a circuit breaker.
4.2.5 The configuration of primary and secondary side switches of underground transformers shall meet the following requirements.
1 In mines with no explosion hazard environment, a load switch should be installed on the primary side of the transformer; when the transformer capacity is 315kV·A or below, an isolating switch fuse can be installed;
2 In mines with explosion hazard environment, a circuit breaker should be installed on the primary side of the transformer;
3 The main switch on the secondary side of the transformer should be equipped with a circuit breaker.
4.2.6 Underground high and low voltage lines should be equipped with phase-to-phase short circuit and overload protection.
4.2.7 When the short-circuit protective device of the low-voltage distribution line is a circuit breaker, the minimum short-circuit current at the end of the protected line should not be lower than 1.5 times the set current of the instantaneous or short-time delay release of the circuit breaker.
4.2.8 The setting of the single-phase grounding protection of the underground 6kV or 10kV system shall meet the following requirements.
1 When the neutral point of the 6kV or 10kV system adopts non-grounding, high-resistance grounding or arc-suppression coil grounding methods, selective single Phase grounding protection; grounding protection should act on tripping or signal; high-voltage feeder lines supplying power to mobile substations should be equipped with selective single-phase grounding protection, and the protection should act on tripping without time limit.
2 When the neutral point of the 6kV or 10kV system adopts the low-resistance grounding method, the high-voltage feeder lines of substations at all levels in the underground shall be installed with two zero-sequence current protections; Quick break, the high-voltage feeder that directly supplies power to motors, transformers and mobile substations should adopt zero-sequence current quick-break without time limit; the second section should adopt zero-sequence overcurrent protection, and the time limit should be the same as that of phase-to-phase overcurrent protection.
4.2.9 Underground high and low voltage electrical installations should be equipped with electric shock protection measures, and should meet the following requirements.
1 Underground agreed contact voltage limit should be 30V for AC and 70V for DC.
2 In mines with explosion hazard environments, the low-voltage power distribution IT system should automatically cut off the power supply as an electric shock protection measure. When a single ground fault occurs to the exposed conductive part or to the ground, the protective device should quickly cut off the fault line.
3 When the AC low-voltage power distribution TN-S system adopts the electric shock protection measures of automatically cutting off the power supply, the terminal circuit supplying rated current not greater than 32A AC mobile equipment shall be equipped with a residual current protector, and the rated residual operating current of the residual current protector shall not Greater than 30mA.
4 When SELV and PELV extra-low voltages are used as electric shock protection measures, the upper limit of the extra-low voltage should not exceed 25V for AC and 60V for DC.
4.2.10 The grounding bus bar of the underground substation directly receiving power from the ground shall be equipotentially bonded to the following conductive parts outside the underground mine.
1 Drainage, compressed air, sprinkler and other metal pipelines;
2 The metal structure installed along the shaft.
4.2.11 For underground substations and mobile substations that do not receive power directly from the ground, local equipotential bonding can be made locally between their grounding busbar and the external conductive parts specified in Article 4.2.10 of this standard.
4.3 Cable routing
4.3.1 The selection of power cables shall meet the following requirements.
1.In shaft shafts or shafts with an inclination angle of 45° and above, the fixedly laid high-voltage cables shall be XLPE insulated thick steel wire armored PVC sheathed power cables;
2 In the horizontal roadway or the shaft roadway with an inclination angle less than 45°, the fixedly laid high-voltage cables shall adopt cross-linked polyethylene insulated steel tape or thin steel wire armored PVC sheathed power cables;
3.The power cable of the mobile substation shall adopt the mining monitoring type shielded rubber sheathed cable;
4 Low-voltage cables fixedly laid should use PVC insulated or XLPE insulated cables;
5 For non-fixed high-voltage and low-voltage cables, it is advisable to use mining rubber-sheathed flexible cables;
6 Mobile and hand-held electrical equipment should use special rubber sheathed cables;
7 Copper core cables should be used for important power circuits, cables for mobile electrical equipment, and low-voltage cables for underground mines in explosive atmospheres;
8 All underground cables shall be flame retardant cables.
4.3.2 The selection of lighting cable lines should meet the following requirements.
1 Fixed lighting lines should use rubber sheathed cables or plastic cables;
2.Rubber-sheathed cables should be used for mobile lighting circuits.
4.3.3 Cable laying should meet the following requirements.
1.The height and position of the cable suspension in the horizontal or inclined roadway shall be such that the cable will not be impacted when the mine car or locomotive falls off the track or other transport vehicles are running, and the cable will not fall on the transport plane or the normal running channel of the vehicle when the cable falls. superior.
2 The cables laid along the drilled holes shall be fastened to the wire ropes, and the drilled holes shall be equipped with metal casings.
3 When cables are laid in parallel with water pipes and air pipes, the cables should be above the pipes, and the clear distance should not be less than 0.3m.
4 When the high-voltage and low-voltage power cables are laid on the same side of the roadway, the high-voltage cables should be laid on the top; the clear distance between high-voltage and low-voltage cables should be greater than 0.1m; the clear distance between high-voltage cables and low-voltage cables should not be less than 0.05m.
5 Power cables and information electric (optical) cables should not be laid on the same side of the roadway. When the conditions are limited and they need to be laid on the same side, the power cables should be at the bottom, and the clear distance from the telephone and signal cables should not be less than 0.1m; The laying distance between cables and information electric (optical) cables in the shaft shall not be less than 0.3m.
6 The distance between the cable suspension points in the horizontal or inclined roadway shall not be greater than 3m; the distance between the cable suspension points in the vertical shaft shall not be greater than 6m.
4.3.4 In addition to the inner armored cables, the armor or metal sheath of the cables should be treated with anti-corrosion treatment.
4.4 Electrical Equipment Chamber
4.4.1 The chamber of the underground main substation should be supported by brickwork or other reliable means. When the underground main substation and the main drainage pumping station are arranged adjacent to each other, a partition wall with a fence and fireproof door shall be set between them; the underground main substation and the main drainage pumping station shall have separate passages leading to the roadway. Dual-purpose doors for fence and fire protection and waterproof airtight doors opening outwards shall be installed on the passages..
The floor of the chamber of the main substation shall be 0.5m higher than the floor of the well bottom parking lot or alley at its exit.
4.4.2 The power distribution equipment in the main substation shall reserve a spare position and shall meet the following requirements.
1 The spare position of high-voltage power distribution equipment shall not be less than 20% of the total number of installations, and shall not be less than 2;
2 The number of backup circuits for low-voltage power distribution equipment should be calculated as 20% of the number of feeder circuits;
3 When there are two or more distribution transformers, no spare position may be reserved; when one distribution transformer is installed in the substation, one spare position should be reserved.
4.4.3 The exit of the substation in the mining area should be equipped with a dual-purpose fireproof door that opens outwards. The substation in the mining area and other...
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