Some standard content:
Engineering Construction Standard Full Text Information System
National Standard of the People's Republic of China
Code for power design of mine
50070-94
Code for power design of mineConstruction Standard
1994-09-10Release
State Bureau of Technical Supervision
Ministry of Construction of the People's Republic of China
Engineering Construction Standard Full Text Information System
1995-04-01Implementation
Jointly Released
Engineering Construction Standard Full Text Information System
National Standard of the People's Republic of China
Code for power design of mine
mineGB50070-94
Editor: Ministry of Coal Industry of the People's Republic of ChinaApproval department: Ministry of Construction of the People's Republic of ChinaEffective date: April 1, 1995
Engineering Construction Standard Full Text Information System
Engineering Construction Standard Full Text Information System
Notice on the release of the national standard "Mine Power
Design Specification"
Jianbiao [1994] No. 572
According to the requirements of the State Planning Commission's Document No. Jizong (1987) 2390, the national standard "Mine Power Design Specification" edited by the Ministry of Coal Industry and revised jointly with relevant departments has been reviewed by relevant departments. The "Mine Power Design Specification" GB50070-194 is now approved as a mandatory national standard and will be implemented from April 1, 1995. The original national standard "Mine Power Installation Design Specification" GBJ70-84 will be abolished at the same time. This specification is managed by the Ministry of Coal Industry, and its specific interpretation and other work is the responsibility of the Beijing Design Institute of the Ministry of Coal Industry. The publication and distribution is organized by the Standard and Quota Research Institute of the Ministry of Construction.
Ministry of Construction of the People's Republic of China
September 10, 1994
Engineering Construction Standards Full Text Information System
Engineering Construction Standards Full Text Information System
Chapter 1
Chapter 2
Chapter 3
Power Supply and Distribution for Mining Engineering
Power Supply and Distribution for Underground Mines
Section 1
Section 2
Section 3
Section 4
Section 5
Section 6
Chapter 4
Chapter 5
Section 1 Section
Section 2
Section 3
Chapter 6
Section 1
Section 2
Chapter 7
Section 1
Section 2
Section 3
Section 4
Section 5
Section 6
Chapter 8
Power supply and distribution voltage and power supply and distribution system
Electric power equipment and its protection
Cable lines
Transformer (distribution) day
Power station bunker
Mine lighting
Protective grounding| |tt||Power supply and distribution in open-pit mines
Electric traction power supply
General provisions
DC traction substation·
DC traction network·
Electric power design for ore dressing plants and coal dressing plants
Power supply and distribution
Process flow control design
600000000
Electric power design for major mechanical equipment in mines
Mine and hoisting device
Mine main ventilation fan
Mine main drainage pump
Air compressor.·
Hoisting belt conveyor
Freight Aerial Ropeway
00000:
Full text information system of construction standard for power distribution of ground blasting material warehouse and its processing room
Full text information system of engineering construction standard
Appendix 1 Explanation of terms used in the specification
Additional explanation
Full text information system of engineering 2 construction standard
Full text information system of engineering construction standard
Chapter 1 General
Article 1.0.1 This specification is formulated to ensure that the power design of mining engineering conscientiously implements the national technical and economic policies, and is safe, reliable, technologically advanced and economically reasonable. Article 1.0.2 This specification is applicable to the power design of newly built and expanded mining engineering, and is not applicable to the power design of petroleum mines.
Article 1.0.3 The power design of mining engineering should correctly handle the relationship between short-term construction and long-term development according to the scale, service life and long-term planning of the mining engineering. Achieve short-term and long-term construction, focus on the short-term, and reasonably take into account the long-term construction. When conditions permit, infrastructure and production power facilities should be combined.
Article 1.0.4 The power design of mining projects must be based on the overall situation, take into account all factors, correctly handle the relationship between power supply and power consumption according to the nature of loads, power consumption capacity, project characteristics, process equipment and regional power supply conditions, and reasonably determine the design plan. Article 1.0.5 In addition to complying with this specification, the power design of mining projects shall also comply with the provisions of the relevant current national standards and specifications. Engineering Construction Standard Full Text Information System
Engineering Construction Standard Full Text Information System
Chapter 2 Power Supply and Distribution for Mining Projects
Article 2.0.1 The classification of power loads for mining projects shall comply with the following provisions: 1. Level 1 load:
1. Main drainage pumps with the risk of flooding due to power outages; 2. Main ventilation fans for mines with explosion and fire hazards; 3. Main ventilation fans for mines with gases that are harmful to human health and life; 4. Manned lifting devices for vertical shafts that are frequently used in mines with the hazards listed in any of Items 1 to 3 of this article:
5. Manned lifting devices for vertical shafts without flat or inclined surfaces and with safe exits, with a depth of more than 150m and frequently used;
6. Mine gas extraction equipment.
Second, secondary loads:
1. Main underground production equipment in large and medium-sized mines that do not belong to the first-level load; 2. Production equipment and lighting equipment for the main production processes on the ground of large and medium-sized mines; 3. Safety monitoring and environmental monitoring equipment in large and medium-sized mines; 4. Underground lighting equipment without portable lighting fixtures. Third, third-level loads:
Production equipment and lighting equipment that do not belong to the first and second-level loads. Article 2.0.2 The classification of power loads for open-pit mine projects shall comply with the following provisions: First-level loads:
1. Drainage equipment used for drainage of shafts and tunnels;
2. Main drainage equipment and drainage equipment that are in danger of flooding the mining site; 3. Signal power supply for large railway stations.
Second, secondary loads:
1. Drainage equipment and drainage equipment for large and medium-sized open-pit mines; Engineering Construction Standard Full Text Information System
Engineering Construction Standard Full Text Information System
2. Coal mining (mining), tunneling, transportation, and earth discharge equipment for large and medium-sized open-pit mines; 3. Main production equipment and lighting equipment in the ground production system of large and medium-sized open-pit mines.
Third, third-level loads:
Production equipment and lighting equipment that do not belong to the first and second level loads. Article 2.0.3 The classification of the secondary load and tertiary load of the ore dressing plant and coal dressing plant project shall comply with the following provisions:
, secondary load:
1. The main equipment and lighting equipment of the crushing, ore and raw coal systems of large and medium-sized ore dressing (coal) plants;
2. The main production equipment and lighting equipment of the heavy selection, grinding, concentration, flotation, drying and other systems of large and medium-sized ore dressing (coal) plants; 3. The main production equipment and lighting equipment of the loading system of large and medium-sized ore dressing (coal) plants.
Second and third loads:
Production equipment and lighting equipment that do not belong to the secondary load. Article 2.0.4 The power supply of mining projects shall comply with the following provisions: 1. The primary load of mining projects shall be supplied by two power supplies, and the two power supplies are allowed to be connected or disconnected. When the two power supplies are connected, they shall also comply with the following provisions:
1. When any kind of fault occurs, no part of the two power supplies shall be damaged at the same time;
2. When any kind of fault occurs and the protection device operates normally, there should be a power supply that does not interrupt the power supply; when any kind of fault occurs and the main protection device fails, so that both power supplies are interrupted, various necessary operations should be completed at the place where someone is on duty, and the power supply of one power supply should be quickly restored.
2. The secondary load of mining projects should be supplied by two power supplies; small mining projects without primary loads can be supplied by a dedicated single power supply. 3. When two or more power supply lines are used, when any one line stops operating, the power supply capacity of the remaining circuits should be able to bear the entire power load of the coal mine, and the power supply capacity of open-pit mines and other mining projects should be able to bear the primary and secondary power loads.Article 5 The power supply for mining projects should be taken from the mining area substation (general step-down substation) or the local power system substation. Article 2.0.6 The establishment of a self-operated power plant or a mine thermal power plant in a mining area should be determined after technical and economic comparison, and should meet one of the following conditions: 1. It should comply with the national industrial policy, coal-electricity joint venture policy, be technically reliable, and economically reasonable.
2. The area where the mining project is located is far away from the power system and it is difficult to obtain power; 3. The local power grid has only one power source and it is difficult to obtain a second power source from the power grid; 4. It should meet the requirements of making full use of low calorific value fuels, achieving cogeneration, comprehensive utilization of coal, and environmental protection.
Article 2.0.7 The power supply voltage for mining projects should be 35kV, 60kV and 110kV. When the power load of the mining project is small and it is reasonable after technical and economic comparison, 6kV and 10kV can be used.
Article 2.0.8 The determination of the number of main transformers in the main substation on the ground of a mining project shall comply with the following provisions:
1. To supply the primary load, when both power sources need to be transformed by the main transformer, there should be no less than 2 transformers;
2. When there is no primary load or there is a primary load but the backup power source does not need to be transformed by the transformer, large and medium-sized mining projects should use 2 transformers, and small mining projects without primary loads can use 1 transformer;
3. When it is technically and economically reasonable, more than 2 transformers can be used. Article 2.0.9 When there are 2 or more main transformers in the main substation on the ground of a mining project, when one of them stops operating, the capacity of the remaining transformers should be able to guarantee the primary and secondary loads.
When there is one main transformer, a margin of 15% to 25% of the total load should be reserved. Article 2.0.10 For the 610kV power grid in the mine, when the single-phase grounding capacitance current is less than or equal to 10A, it is advisable to adopt the method of ungrounding the neutral point of the power supply; when it is greater than 10A, restrictive measures must be taken. When the automatic tuning arc suppression coil series and parallel resistance grounding method is adopted, the allowable deviation of the detuning degree is within ±5%, and the reactive component of the grounding current should not be greater than 5A. When non-automatic tuning is adopted, over-compensation tuning must be performed, and the residual current at the fault point should not be greater than 10A; the detuning degree should not be greater than 10%. Note: It indicates its limit values and measures, and can also be implemented according to the current relevant industry regulations. Article 2.0.11 Mobile open-pit mining (coal mining) sites The equipment should be powered by a towing cable with a safety grounding device. Article 2.0.12 The single-phase grounding protection device of the 6~10kV ground power grid in mining projects shall comply with the following provisions:
1. Neutral point ungrounded method
1. The system's grounding indicator device should be able to display the system's single-phase grounding; 2. When the system's single-phase grounding current can meet the protection device's sensitivity requirements, a grounding fault detection device or a selective single-phase grounding protection device should be installed on each feedback output line;
3. When the system's single-phase grounding current is 10A or above, the protection device of the high-voltage motor circuit should instantly operate on tripping, and other feeder lines can operate on signals. 2. Neutral point grounding method via high resistance: 1. The system's single-phase grounding When the ground current can meet the sensitivity requirements of the protection device, a ground fault detection device or a selective single-phase grounding protection device should be installed on each feedback output line;
2. When the single-phase grounding current is less than 10A, the protection devices of the high-voltage motor and other circuits should operate on tripping or signaling; when the single-phase grounding current is equal to or greater than 10A, the protection device of the high-voltage motor circuit should operate on tripping, and other circuits should operate on signals.
3. Neutral point series and high-resistance grounding method through arc suppression coil: Harmonic directional grounding protection devices should be installed on all high-voltage feeder lines, and their action requirements should meet the requirements of the second paragraph of this article. Article 2.0.13 The limit value and The permissible value of harmonic current shall comply with the provisions of the current national engineering construction standards full text information system
engineering construction standards full text information system
power quality public power grid harmonics. The total distortion rate of the voltage sinusoidal waveform of the 610kV busbar of the ground main substation of the mining project should not be greater than 5%. Article 2.0.14 When taking measures to suppress harmonics, priority should be given to increasing the number of rectifier phases and phase shifting measures; after technical and economic comparison, system isolation or filter methods can be used when reasonable.
Article 2.0.15 The comprehensive harmonic generation of multiple harmonic sources should be determined based on actual measurement or calculation.
Article 2.0.16 When selecting the reactive compensation device of the ground main substation, the influence of the filter device capacity should be taken into account. When the harmonic causes the voltage fluctuation of the 610kV busbar of the ground main substation to exceed the permissible value, a reactive dynamic compensation device can be used. Article 2.0.17 For parallel capacitors on the bus with harmonic sources, the overcurrent, overvoltage and power loss values must be calculated.
Article 2.0.18 When using segmented bus power supply, multiple harmonic sources can be concentrated on one bus. When two bus sections are connected to harmonic sources, each bus section should be equipped with a filter device. Whether the filter device can be connected in parallel should be determined by calculation. Article 2.0.19 A high-pass filter device can be equipped with a separate circuit breaker; the remaining filter devices can share a circuit breaker.
The circuit breaker connected to the filter device should be an oil circuit breaker that can avoid reignition or a vacuum circuit breaker that can meet the short-circuit requirements.
Article 2.0.20 The distribution voltage of the ground high-voltage power grid of mining engineering should be 6kV and 10kV. After technical and economic comparison, 35kV can also be used when reasonable. Article 2.0.21 The internal power distribution lines of mining projects shall comply with the following provisions:
, Level 1 loads shall use two-circuit power supply lines and be connected to different bus sections of power supply. When conditions are limited, one circuit shall be drawn from the main substation on the ground, and the other circuit shall be drawn from other distribution sites of the same load level on the ground. Three, Level 2 loads shall use two-circuit power supply lines and be connected to different bus sections of power supply. When conditions are limited, one circuit shall be drawn from the main substation on the ground, and the other circuit shall be drawn from other distribution sites.
Engineering 6 Construction Standard Full Text Information System
Engineering Construction Standard Full Text Information System
Three, Level 3 loads shall be powered by a single power supply line. Article 2.0.22 When the ground power distribution power supply of mining projects uses two or more power supply lines, and one of the circuits stops running, the power supply capacity of the remaining circuits shall be able to bear the first-level load and the second-level load.
Article 2.0.23 The route selection of fixed overhead power lines in mining projects shall meet the following requirements:
1. They should not be erected in blasting danger zones;
2. They should not be erected in unstable waste dumps and should have a safe distance;
3. They should avoid passing through initial collapse areas. When this is unavoidable, safety measures should be taken;
4. They should utilize the boundaries of mining areas or fault ore (coal) pillars. When no ore (coal) pillars are available, the lines should be perpendicular to the direction of the ore (coal) field, and there should be a safe distance between the two lines.
Article 2.0.24 The location selection of the main ground substation of a mining project shall meet the following requirements:
1. The distance from the mining boundary of the mining site shall be greater than or equal to 200m; 2. It shall not be located within the explosion hazard zone of the blasting equipment warehouse; 3. It should not be located in an unstable waste disposal site and should have a safe distance; 4. It should not be located in an initial collapse area. When it is difficult to avoid the collapse area, safety measures such as grouting and filling should be taken;
5. The distance between the production building (structure) of the main substation of an open-pit mine and the standard railway shall not be less than 40m. When conditions are limited, it can be appropriately reduced; 6. The distance between the main substation and the high noise source shall be controlled according to the indoor background noise level of the main control room not exceeding 60dB.
Engineering Construction Standard Full Text Information SystemArticle 8 The number of main transformers in the main substation on the ground of a mining project shall be determined in accordance with the following provisions:
1. To supply the primary load, when both power sources need to be transformed by the main transformer, there should be no less than 2 transformers;
2. When there is no primary load or there is a primary load but the backup power source does not need to be transformed by the transformer, large and medium-sized mining projects should use 2 transformers, and small mining projects without primary loads can use 1 transformer;
3. When it is technically and economically reasonable, more than 2 transformers can be used. Article 2.0.9 When there are 2 or more main transformers in the main substation on the ground of a mining project, when one of them stops operating, the capacity of the remaining transformers should be able to guarantee the primary and secondary loads.
When there is one main transformer, a margin of 15% to 25% of the total load should be reserved. Article 2.0.10 For the 610kV power grid in the mine, when the single-phase grounding capacitance current is less than or equal to 10A, it is advisable to adopt the method of ungrounding the neutral point of the power supply; when it is greater than 10A, restrictive measures must be taken. When the automatic tuning arc suppression coil series and parallel resistance grounding method is adopted, the allowable deviation of the detuning degree is within ±5%, and the reactive component of the grounding current should not be greater than 5A. When non-automatic tuning is adopted, over-compensation tuning must be performed, and the residual current at the fault point should not be greater than 10A; the detuning degree should not be greater than 10%. Note: It indicates its limit values and measures, and can also be implemented according to the current relevant industry regulations. Article 2.0.11 Mobile open-pit mining (coal mining) sites The equipment should be powered by a towing cable with a safety grounding device. Article 2.0.12 The single-phase grounding protection device of the 6~10kV ground power grid in mining projects shall comply with the following provisions:
1. Neutral point ungrounded method
1. The system's grounding indicator device should be able to display the system's single-phase grounding; 2. When the system's single-phase grounding current can meet the protection device's sensitivity requirements, a grounding fault detection device or a selective single-phase grounding protection device should be installed on each feedback output line;
3. When the system's single-phase grounding current is 10A or above, the protection device of the high-voltage motor circuit should instantly operate on tripping, and other feeder lines can operate on signals. 2. Neutral point grounding method via high resistance: 1. The system's single-phase grounding When the ground current can meet the sensitivity requirements of the protection device, a ground fault detection device or a selective single-phase grounding protection device should be installed on each feedback output line;
2. When the single-phase grounding current is less than 10A, the protection devices of the high-voltage motor and other circuits should operate on tripping or signaling; when the single-phase grounding current is equal to or greater than 10A, the protection device of the high-voltage motor circuit should operate on tripping, and other circuits should operate on signals.
3. Neutral point series and high-resistance grounding method through arc suppression coil: Harmonic directional grounding protection devices should be installed on all high-voltage feeder lines, and their action requirements should meet the requirements of the second paragraph of this article. Article 2.0.13 The limit value and The permissible value of harmonic current shall comply with the provisions of the current national engineering construction standards full text information system
engineering construction standards full text information system
power quality public power grid harmonics. The total distortion rate of the voltage sinusoidal waveform of the 610kV busbar of the ground main substation of the mining project should not be greater than 5%. Article 2.0.14 When taking measures to suppress harmonics, priority should be given to increasing the number of rectifier phases and phase shifting measures; after technical and economic comparison, system isolation or filter methods can be used when reasonable.
Article 2.0.15 The comprehensive harmonic generation of multiple harmonic sources should be determined based on actual measurement or calculation.
Article 2.0.16 When selecting the reactive compensation device of the ground main substation, the influence of the filter device capacity should be taken into account. When the harmonic causes the voltage fluctuation of the 610kV busbar of the ground main substation to exceed the permissible value, a reactive dynamic compensation device can be used. Article 2.0.17 For parallel capacitors on the bus with harmonic sources, the overcurrent, overvoltage and power loss values must be calculated.
Article 2.0.18 When using segmented bus power supply, multiple harmonic sources can be concentrated on one bus. When two bus sections are connected to harmonic sources, each bus section should be equipped with a filter device. Whether the filter device can be connected in parallel should be determined by calculation. Article 2.0.19 A high-pass filter device can be equipped with a separate circuit breaker; the remaining filter devices can share a circuit breaker.
The circuit breaker connected to the filter device should be an oil circuit breaker that can avoid reignition or a vacuum circuit breaker that can meet the short-circuit requirements.
Article 2.0.20 The distribution voltage of the ground high-voltage power grid of mining engineering should be 6kV and 10kV. After technical and economic comparison, 35kV can also be used when reasonable. Article 2.0.21 The internal power distribution lines of mining projects shall comply with the following provisions:
, Level 1 loads shall use two-circuit power supply lines and be connected to different bus sections of power supply. When conditions are limited, one circuit shall be drawn from the main substation on the ground, and the other circuit shall be drawn from other distribution sites of the same load level on the ground. Three, Level 2 loads shall use two-circuit power supply lines and be connected to different bus sections of power supply. When conditions are limited, one circuit shall be drawn from the main substation on the ground, and the other circuit shall be drawn from other distribution sites.
Engineering 6 Construction Standard Full Text Information System
Engineering Construction Standard Full Text Information System
Three, Level 3 loads shall be powered by a single power supply line. Article 2.0.22 When the ground power distribution power supply of mining projects uses two or more power supply lines, and one of the circuits stops running, the power supply capacity of the remaining circuits shall be able to bear the first-level load and the second-level load.
Article 2.0.23 The route selection of fixed overhead power lines in mining projects shall meet the following requirements:
1. They should not be erected in blasting danger zones;
2. They should not be erected in unstable waste dumps and should have a safe distance;
3. They should avoid passing through initial collapse areas. When this is unavoidable, safety measures should be taken;
4. They should utilize the boundaries of mining areas or fault ore (coal) pillars. When no ore (coal) pillars are available, the lines should be perpendicular to the direction of the ore (coal) field, and there should be a safe distance between the two lines.
Article 2.0.24 The location selection of the main ground substation of a mining project shall meet the following requirements:
1. The distance from the mining boundary of the mining site shall be greater than or equal to 200m; 2. It shall not be located within the explosion hazard zone of the blasting equipment warehouse; 3. It should not be located in an unstable waste disposal site and should have a safe distance; 4. It should not be located in an initial collapse area. When it is difficult to avoid the collapse area, safety measures such as grouting and filling should be taken;
5. The distance between the production building (structure) of the main substation of an open-pit mine and the standard railway shall not be less than 40m. When conditions are limited, it can be appropriately reduced; 6. The distance between the main substation and the high noise source shall be controlled according to the indoor background noise level of the main control room not exceeding 60dB.
Engineering Construction Standard Full Text Information SystemArticle 8 The number of main transformers in the main substation on the ground of a mining project shall be determined in accordance with the following provisions:
1. To supply the primary load, when both power sources need to be transformed by the main transformer, there should be no less than 2 transformers;
2. When there is no primary load or there is a primary load but the backup power source does not need to be transformed by the transformer, large and medium-sized mining projects should use 2 transformers, and small mining projects without primary loads can use 1 transformer;
3. When it is technically and economically reasonable, more than 2 transformers can be used. Article 2.0.9 When there are 2 or more main transformers in the main substation on the ground of a mining project, when one of them stops operating, the capacity of the remaining transformers should be able to guarantee the primary and secondary loads.
When there is one main transformer, a margin of 15% to 25% of the total load should be reserved. Article 2.0.10 For the 610kV power grid in the mine, when the single-phase grounding capacitance current is less than or equal to 10A, it is advisable to adopt the method of ungrounding the neutral point of the power supply; when it is greater than 10A, restrictive measures must be taken. When the automatic tuning arc suppression coil series and parallel resistance grounding method is adopted, the allowable deviation of the detuning degree is within ±5%, and the reactive component of the grounding current should not be greater than 5A. When non-automatic tuning is adopted, over-compensation tuning must be performed, and the residual current at the fault point should not be greater than 10A; the detuning degree should not be greater than 10%. Note: It indicates its limit values and measures, and can also be implemented according to the current relevant industry regulations. Article 2.0.11 Mobile open-pit mining (coal mining) sites The equipment should be powered by a towing cable with a safety grounding device. Article 2.0.12 The single-phase grounding protection device of the 6~10kV ground power grid in mining projects shall comply with the following provisions:
1. Neutral point ungrounded method
1. The system's grounding indicator device should be able to display the system's single-phase grounding; 2. When the system's single-phase grounding current can meet the protection device's sensitivity requirements, a grounding fault detection device or a selective single-phase grounding protection device should be installed on each feedback output line;
3. When the system's single-phase grounding current is 10A or above, the protection device of the high-voltage motor circuit should instantly operate on tripping, and other feeder lines can operate on signals. 2. Neutral point grounding method via high resistance: 1. The system's single-phase grounding When the ground current can meet the sensitivity requirements of the protection device, a ground fault detection device or a selective single-phase grounding protection device should be installed on each feedback output line;
2. When the single-phase grounding current is less than 10A, the protection devices of the high-voltage motor and other circuits should operate on tripping or signaling; when the single-phase grounding current is equal to or greater than 10A, the protection device of the high-voltage motor circuit should operate on tripping, and other circuits should operate on signals.
3. Neutral point series and high-resistance grounding method through arc suppression coil: Harmonic directional grounding protection devices should be installed on all high-voltage feeder lines, and their action requirements should meet the requirements of the second paragraph of this article. Article 2.0.13 The limit value and The permissible value of harmonic current shall comply with the provisions of the current national engineering construction standards full text information system
engineering construction standards full text information system
power quality public power grid harmonics. The total distortion rate of the voltage sinusoidal waveform of the 610kV busbar of the ground main substation of the mining project should not be greater than 5%. Article 2.0.14 When taking measures to suppress harmonics, priority should be given to increasing the number of rectifier phases and phase shifting measures; after technical and economic comparison, system isolation or filter methods can be used when reasonable.
Article 2.0.15 The comprehensive harmonic generation of multiple harmonic sources should be determined based on actual measurement or calculation.
Article 2.0.16 When selecting the reactive compensation device of the ground main substation, the influence of the filter device capacity should be taken into account. When the harmonic causes the voltage fluctuation of the 610kV busbar of the ground main substation to exceed the permissible value, a reactive dynamic compensation device can be used. Article 2.0.17 For parallel capacitors on the bus with harmonic sources, the overcurrent, overvoltage and power loss values must be calculated.
Article 2.0.18 When using segmented bus power supply, multiple harmonic sources can be concentrated on one bus. When two bus sections are connected to harmonic sources, each bus section should be equipped with a filter device. Whether the filter device can be connected in parallel should be determined by calculation. Article 2.0.19 A high-pass filter device can be equipped with a separate circuit breaker; the remaining filter devices can share a circuit breaker.
The circuit breaker connected to the filter device should be an oil circuit breaker that can avoid reignition or a vacuum circuit breaker that can meet the short-circuit requirements.
Article 2.0.20 The distribution voltage of the ground high-voltage power grid of mining engineering should be 6kV and 10kV. After technical and economic comparison, 35kV can also be used when reasonable. Article 2.0.21 The internal power distribution lines of mining projects shall comply with the following provisions:
, Level 1 loads shall use two-circuit power supply lines and be connected to different bus sections of power supply. When conditions are limited, one circuit shall be drawn from the main substation on the ground, and the other circuit shall be drawn from other distribution sites of the same load level on the ground. Three, Level 2 loads shall use two-circuit power supply lines and be connected to different bus sections of power supply. When conditions are limited, one circuit shall be drawn from the main substation on the ground, and the other circuit shall be drawn from other distribution sites.
Engineering 6 Construction Standard Full Text Information System
Engineering Construction Standard Full Text Information System
Three, Level 3 loads shall be powered by a single power supply line. Article 2.0.22 When the ground power distribution power supply of mining projects uses two or more power supply lines, and one of the circuits stops running, the power supply capacity of the remaining circuits shall be able to bear the first-level load and the second-level load.
Article 2.0.23 The route selection of fixed overhead power lines in mining projects shall meet the following requirements:
1. They should not be erected in blasting danger zones;
2. They should not be erected in unstable waste dumps and should have a safe distance; wwW.bzxz.Net
3. They should avoid passing through initial collapse areas. When this is unavoidable, safety measures should be taken;
4. They should utilize the boundaries of mining areas or fault ore (coal) pillars. When no ore (coal) pillars are available, the lines should be perpendicular to the direction of the ore (coal) field, and there should be a safe distance between the two lines.
Article 2.0.24 The location selection of the main ground substation of a mining project shall meet the following requirements:
1. The distance from the mining boundary of the mining site shall be greater than or equal to 200m; 2. It shall not be located within the explosion hazard zone of the blasting equipment warehouse; 3. It should not be located in an unstable waste disposal site and should have a safe distance; 4. It should not be located in an initial collapse area. When it is difficult to avoid the collapse area, safety measures such as grouting and filling should be taken;
5. The distance between the production building (structure) of the main substation of an open-pit mine and the standard railway shall not be less than 40m. When conditions are limited, it can be appropriately reduced; 6. The distance between the main substation and the high noise source shall be controlled according to the indoor background noise level of the main control room not exceeding 60dB.
Engineering Construction Standard Full Text Information SystemWhen the single-phase grounding current of the system can meet the sensitivity requirements of the protection device, a grounding fault detection device or a selective single-phase grounding protection device should be installed on each feedback output line;
2. When the single-phase grounding current is less than 10A, the protection device of the high-voltage motor and other circuits should be operated on tripping or signaling; when the single-phase grounding current is equal to or greater than 10A, the protection device of the high-voltage motor circuit should be operated on tripping, and other circuits should be operated on signals.
3. Neutral point series and high-resistance grounding method through arc suppression coil: Harmonic directional grounding protection devices should be installed on all high-voltage feeder lines, and their action requirements should meet the requirements of the second paragraph of this article. Article 2.0.13 The limit value of the voltage sinusoidal waveform distortion rate and the allowable value of harmonic current at the harmonic monitoring point of the mining power system shall comply with the current national relevant engineering construction standards full-text information system
engineering construction standards full-text information system
power quality public power grid harmonic regulations. The total distortion rate of the voltage sinusoidal waveform of the 610kV busbar of the main ground substation of the mining project should not be greater than 5%. Article 2.0.14 When taking measures to suppress harmonics, priority should be given to increasing the number of rectifier phases and phase shifting measures; after technical and economic comparison, system isolation or filter methods can be used when reasonable.
Article 2.0.15 The comprehensive harmonic generation of multiple harmonic sources should be determined based on actual measurement or calculation.
Article 2.0.16 When selecting the reactive compensation device of the ground main substation, the influence of the capacity of the filter device should be taken into account. When the harmonic causes the voltage fluctuation of the 610kV busbar of the ground main substation to exceed the allowable value, a reactive dynamic compensation device can be used. Article 2.0.17 For parallel capacitors on the busbar with harmonic sources, the overcurrent, overvoltage and power loss values must be calculated.
Article 2.0.18 When using segmented busbar power supply, multiple harmonic sources can be concentrated on one busbar. When two sections of busbars are connected to harmonic sources respectively, each section of busbars shall be equipped with a filter device. Whether the filter device can be connected in parallel shall be determined by calculation. Article 2.0.19 A high-pass filter device can be equipped with a circuit breaker alone; the other filter devices can share a circuit breaker.
The circuit breaker connected to the filter device should be an oil circuit breaker that can avoid re-ignition or a vacuum circuit breaker that can meet the short-circuit requirements.
Article 2.0.20 The distribution voltage of the ground high-voltage power grid of the mining project shall be 6kV and 10kV. After technical and economic comparison, 35kV can also be used when reasonable. Article 2.0.21 The internal power distribution power supply line of the mining project shall comply with the following provisions:
, the first-level load shall use a two-circuit power supply line, and it shall be connected to different busbar sections of the power supply. When conditions are limited, one circuit shall be drawn from the main substation on the ground, and the other circuit shall be drawn from other distribution places of the same load level on the ground. For level 3 and level 2 loads, two-circuit power supply lines should be used, and they should be connected to different bus sections of power supply. When conditions are limited, one circuit should be drawn from the main ground substation and the other circuit should be drawn from other distribution sites.
Engineering 6 Construction Standard Full Text Information System
Engineering Construction Standard Full Text Information System
Level 3 loads should be powered by a single power supply line. Article 2.0.22 When the ground power distribution power supply of the mining project adopts two or more power supply lines, and one of the circuits stops running, the power supply capacity of the remaining circuits should be able to bear the level 1 and level 2 loads.
Article 2.0.23 The route selection of fixed overhead power lines in mining projects shall meet the following requirements:
1. They should not be erected in blasting danger zones;
2. They should not be erected in unstable waste dumps and should have a safe distance;
3. They should avoid passing through initial collapse areas. When this is unavoidable, safety measures should be taken;
4. They should utilize the boundaries of mining areas or fault ore (coal) pillars. When no ore (coal) pillars are available, the lines should be perpendicular to the direction of the ore (coal) field, and there should be a safe distance between the two lines.
Article 2.0.24 The location selection of the main ground substation of a mining project shall meet the following requirements:
1. The distance from the mining boundary of the mining site shall be greater than or equal to 200m; 2. It shall not be located within the explosion hazard zone of the blasting equipment warehouse; 3. It should not be located in an unstable waste disposal site and should have a safe distance; 4. It should not be located in an initial collapse area. When it is difficult to avoid the collapse area, safety measures such as grouting and filling should be taken;
5. The distance between the production building (structure) of the main substation of an open-pit mine and the standard railway shall not be less than 40m. When conditions are limited, it can be appropriately reduced; 6. The distance between the main substation and the high noise source shall be controlled according to the indoor background noise level of the main control room not exceeding 60dB.
Engineering Construction Standard Full Text Information SystemWhen the single-phase grounding current of the system can meet the sensitivity requirements of the protection device, a grounding fault detection device or a selective single-phase grounding protection device should be installed on each feedback output line;
2. When the single-phase grounding current is less than 10A, the protection device of the high-voltage motor and other circuits should be operated on tripping or signaling; when the single-phase grounding current is equal to or greater than 10A, the protection device of the high-voltage motor circuit should be operated on tripping, and other circuits should be operated on signals.
3. Neutral point series and high-resistance grounding method through arc suppression coil: Harmonic directional grounding protection devices should be installed on all high-voltage feeder lines, and their action requirements should meet the requirements of the second paragraph of this article. Article 2.0.13 The limit value of the voltage sinusoidal waveform distortion rate and the allowable value of harmonic current at the harmonic monitoring point of the mining power system shall comply with the current national relevant engineering construction standards full-text information system
engineering construction standards full-text information system
power quality public power grid harmonic regulations. The total distortion rate of the voltage sinusoidal waveform of the 610kV busbar of the main ground substation of the mining project should not be greater than 5%. Article 2.0.14 When taking measures to suppress harmonics, priority should be given to increasing the number of rectifier phases and phase shifting measures; after technical and economic comparison, system isolation or filter methods can be used when reasonable.
Article 2.0.15 The comprehensive harmonic generation of multiple harmonic sources should be determined based on actual measurement or calculation.
Article 2.0.16 When selecting the reactive compensation device of the ground main substation, the influence of the capacity of the filter device should be taken into account. When the harmonic causes the voltage fluctuation of the 610kV busbar of the ground main substation to exceed the allowable value, a reactive dynamic compensation device can be used. Article 2.0.17 For parallel capacitors on the busbar with harmonic sources, the overcurrent, overvoltage and power loss values must be calculated.
Article 2.0.18 When using segmented busbar power supply, multiple harmonic sources can be concentrated on one busbar. When two sections of busbars are connected to harmonic sources respectively, each section of busbars shall be equipped with a filter device. Whether the filter device can be connected in parallel shall be determined by calculation. Article 2.0.19 A high-pass filter device can be equipped with a circuit breaker alone; the other filter devices can share a circuit breaker.
The circuit breaker connected to the filter device should be an oil circuit breaker that can avoid re-ignition or a vacuum circuit breaker that can meet the short-circuit requirements.
Article 2.0.20 The distribution voltage of the ground high-voltage power grid of the mining project shall be 6kV and 10kV. After technical and economic comparison, 35kV can also be used when reasonable. Article 2.0.21 The internal power distribution power supply line of the mining project shall comply with the following provisions:
, the first-level load shall use a two-circuit power supply line, and it shall be connected to different busbar sections of the power supply. When conditions are limited, one circuit shall be drawn from the main substation on the ground, and the other circuit shall be drawn from other distribution places of the same load level on the ground. For level 3 and level 2 loads, two-circuit power supply lines should be used, and they should be connected to different bus sections of power supply. When conditions are limited, one circuit should be drawn from the main ground substation and the other circuit should be drawn from other distribution sites.
Engineering 6 Construction Standard Full Text Information System
Engineering Construction Standard Full Text Information System
Level 3 loads should be powered by a single power supply line. Article 2.0.22 When the ground power distribution power supply of the mining project adopts two or more power supply lines, and one of the circuits stops running, the power supply capacity of the remaining circuits should be able to bear the level 1 and level 2 loads.
Article 2.0.23 The route selection of fixed overhead power lines in mining projects shall meet the following requirements:
1. They should not be erected in blasting danger zones;
2. They should not be erected in unstable waste dumps and should have a safe distance;
3. They should avoid passing through initial collapse areas. When this is unavoidable, safety measures should be taken;
4. They should utilize the boundaries of mining areas or fault ore (coal) pillars. When no ore (coal) pillars are available, the lines should be perpendicular to the direction of the ore (coal) field, and there should be a safe distance between the two lines.
Article 2.0.24 The location selection of the main ground substation of a mining project shall meet the following requirements:
1. The distance from the mining boundary of the mining site shall be greater than or equal to 200m; 2. It shall not be located within the explosion hazard zone of the blasting equipment warehouse; 3. It should not be located in an unstable waste disposal site and should have a safe distance; 4. It should not be located in an initial collapse area. When it is difficult to avoid the collapse area, safety measures such as grouting and filling should be taken;
5. The distance between the production building (structure) of the main substation of an open-pit mine and the standard railway shall not be less than 40m. When conditions are limited, it can be appropriately reduced; 6. The distance between the main substation and the high noise source shall be controlled according to the indoor background noise level of the main control room not exceeding 60dB.
Engineering Construction Standard Full Text Information SystemArticle 24 The location selection of the ground main substation of mining engineering should meet the following requirements:
1. The distance from the mining boundary of the mining site should be greater than or equal to 200m; 2. It should not be located within the explosion hazard zone of the blasting equipment warehouse; 3. It should not be located in an unstable waste disposal site, and there should be a safe distance; 4. It should not be located in the initial collapse area. When it is difficult to avoid the collapse area, grouting, filling and other safety measures should be taken;
5. The distance between the production building (structure) of the main substation of the open-pit mine and the standard railway shall not be less than 40m. When conditions are limited, it can be appropriately reduced; 6. The distance between the main substation and the high noise source should be controlled according to the indoor background noise level of the main control room not exceeding 60dB.
Engineering Construction Standard Full Text Information SystemArticle 24 The location selection of the ground main substation of mining engineering should meet the following requirements:
1. The distance from the mining boundary of the mining site should be greater than or equal to 200m; 2. It should not be located within the explosion hazard zone of the blasting equipment warehouse; 3. It should not be located in an unstable waste disposal site, and there should be a safe distance; 4. It should not be located in the initial collapse area. When it is difficult to avoid the collapse area, grouting, filling and other safety measures should be taken;
5. The distance between the production building (structure) of the main substation of the open-pit mine and the standard railway shall not be less than 40m. When conditions are limited, it can be appropriately reduced; 6. The distance between the main substation and the high noise source should be controlled according to the indoor background noise level of the main control room not exceeding 60dB.
Engineering Construction Standard Full Text Information System
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