Professional r & d capacity
Professional r & d teams, well-developed r & d systems, product design capabilities in targeted areas and special applications, battery technology and solutions for customers。
High value for product
Continuously improve product design, improve production processes, control product costs while local product performance, and provide green, high-value products to society。
Client services
Firstpower (one electron) insists on a service concept that creates value for the client and provides the client with a personalized and satisfactory service。
Efficient implementation capacity
Efficient team, proactive response and assistance to clients, from product development, production, installation, commissioning
And maintenance, firstpower (one battery) provides efficient services。
Reliable product quality
Firstpower (one electron) has a corporate responsibility to “time print, quality for the future” and provides society with reliable and reliable battery products。
Professional r & d capacity
Professional r & d teams, well-developed r & d systems, product design capabilities in targeted areas and special applications, battery technology and solutions for customers。
High value for product
Continuously improve product design, improve production processes, control product costs while local product performance, and provide green, high-value products to society。
Client services
Firstpower (one electron) insists on a service concept that creates value for the client and provides the client with a personalized and satisfactory service。
Efficient implementation capacity
Efficient team, proactive response and assistance to clients, from product development, production, installation, commissioning
And maintenance, firstpower (one battery) provides efficient services。
Grounding and mine control requirements for electrical equipment for construction
Grounding and mine control requirements for electrical equipment for construction
1. Low-pressure power systems at the construction site shall be grounded in accordance with the following provisions:
(1) tn-s protection systems should be used for the direct location of the transformer's low-pressure neutral point when power is provided by transformers
(2) when the construction site is powered by a generator, the neutral point of the generator is placed directly on the ground and the tn-s protection system is used and should be set up independently
(3) when the construction site is powered directly by an external transformer, its basic site, the interface
The formula should be consistent with external power supply systems. When external power is tn-c, it should be replaced with tn-s when it enters the construction site
(4) in the same power supply system, not a portion of the equipment shall be protected and another part of the equipment shall be protected。
2. The electrical protection and repeat site for construction shall conform to the following provisions:
(1) metal casings of electrical equipment in the protective system are connected to the protective line (pe line)。
(2) the protection connection shall meet the following requirements:
1 the line of protection shall be derived from the neutral line (n) at the point of entry in the electrical distribution room, general distribution tank。
2 convergence line unified with green/yellow double insulation guide, not under the circumstances
Green/yellow double line should be used for load lines。
The 3-load side line (pe line) is isolated from the work line (n line) and is strictly closed
The connection is mixed with the work line。
No control switches or breakers shall be installed on the line of protection。
The line of protection shall not be less than the section of the corresponding work line. With electrical equipment
The interconnected protection line transect shall not be less than 2. 5 mm2 of a multi-asset insulation copper line。
(3) an empty circuit terminal, a distribution tank 50 m distance from the power transformer, shall be protected by a repeat line。
3. Electrical resistance for the purpose of construction shall conform to the following provisions:
(1) the working electrical resistance value of the electrical transformer or generator shall not exceed four times。
(2) in the tn-connected protection system, the repeat site shall be connected to the line of protection, and the repeat site resistance value shall not exceed 10 times each。
4. Mine-protective work during the rainy season shall be carried out in accordance with the following provisions:
(1) the conversion and distribution of electrical devices located in mountainous and mine areas shall be equipped with independent anti-mine devices。
(2) when high-strength (constructive) structures and metal structures (vertical devices, scaffoldings, etc.) above 20 m above the construction site are outside the protective scope of the mine-protective devices for adjacent (constructive) structures, they shall be equipped with mine-protective devices。
(3) the impact of a mine-protective device shall not have more than 30 electrical resistance times。
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