1.0.1 This code is formulated with view to implementing national laws, regulations, principles and policies during the design of electric power in mine, guaranteeing life safety and equipment safety and realizing reliable power supply and distribution, energy conservation, favorable environment protection, advanced technology and economic rationality.
1.0.2 This code is applicable to the design of electric power in various newly-constructed, renovated and extended mines (except petroleum mine).
1.0.3 The design scheme and equipped level of electric power in mine shall be reasonably determined according to the mine scale, process characteristics, load property, power utilization and local power supply conditions.
1.0.4 For the design of electric power in mine, the relationship between the short-term development and the long-term development of electric power construction in mine shall be properly treated, namely short-term development is mainly concentrated, accompanied with long-term development. If conditions permit, the fundamental construction shall be combined with the production of electric appliance.
1.0.5 The design of electric power in mine shall not only meet the requirements stipulated in this code, but also complies with those in the current relevant ones of the nation.
2 Terms
2.0.1 Substation (distribution station)
A constituent part of power system able to receive and collect power supply from electric power system, transfer the voltage and then distribute the electric power. Where it is provided with all of the above main functions, it is referred to as substation; where there is no main transformer (without voltage transformation function), it is referred to as distribution station.
2.0.2 Mining area
Substation (distribution station) used for the power distribution of the whole or partial mining area; generally the power distribution scope includes several mines, surface mines, dressing plant, mining area administration, production management mechanism and auxiliary and affiliated enterprises.
2.0.3 Surface main substation (distribution station)
The enterprise substation/distribution center arranged in mines or on surfaces mine and used to receive and collect the external power supply of this enterprise. It is provided with power distribution function for the whole or partial load within this enterprise, and is also known as main step-down substation.
2.0.4 Underground main substation (distribution station)
The substation/distribution center arranged on the underground shaft station or main haulage roadway, used to receive ground supply connected from the mine and provided with function to distribute power for the whole or partial load of this mining level (sometimes the adjacent mining level is also included). It is also known as the underground central substation (distribution station).
2.0.5 Working section substation (distribution station)
The substation (distribution station) mainly distributing power to the load within the range of one or more underground working section(s).
2.0.6 Plant of utilizing castoff or by-product in mine for generating electricity
An enterprise producing electric power and heating power with fuel of mining by-product like the low heat waste and coalbed gas generated during the production and processing of mine.
2.0.7 Mining electric apparatus for non-explosive atmospheres
The electric apparatus in accordance with specific safety requirements of mine and applicable to the underground normal non-explosive atmospheres.
2.0.8 Underground main earthed electrode
The metal sheet earthed electrode arranged in the main and auxiliary water sump or drainage sump on the shaft bottom of underground mining level.
2.0.9 Underground local earthed electrode
Earthed electrode (in addition to the main earthed electrode) arranged in underground site equipped with concentrated or single electric apparatus.
2.0.10 Underground earthing conductor
Metal conductor used to connect the earthing terminal of electric apparatus to the earthing plate, including: earthing branch, earthing busbar and earthing trunk line. Thereinto, the earthing conductor connecting the earthing terminal of equipment to the earthed electrode is referred to as the earthing branch, the tandem busbar of earthing branches is referred to as the earthing busbar, and the earthing conductor used for the interconnection of earth devices is referred to as the earthing trunk line.
2.0.11 Underground earth device
