Electrical equipment with high efficiency, low energy consumption, advanced performance, durability and reliability should be adopted, and green environmental protection materials should be adopted.
The distribution transformer shall be D, yn 1 1 wiring group, and the amorphous alloy core type low-loss transformer shall be selected.
Three-phase distribution transformers shall meet the requirements of energy-saving evaluation value in the current national standard "Limits and grades of energy efficiency of three-phase distribution transformers" GB 20052. Dry-type transformer should have its own ventilation and cooling facilities.
Water pumps, fans and other equipment and other electrical devices should meet the requirements of energy-saving evaluation values of relevant current national standards. The efficiency of small and medium-sized three-phase asynchronous motors at rated output power and 75% rated output power should not be lower than the energy-saving evaluation value specified in the current national standard "Limits and grades of energy efficiency of small and medium-sized three-phase asynchronous motors" GB 186 13.
The holding power of AC contactor should not be higher than the energy-saving evaluation value specified in the current national standard "Limits and grades of AC contactor energy efficiency" GB 2 15 18.
Choose the starting mode of the motor reasonably to avoid causing great voltage shock to the power grid. When using soft start or variable frequency start mode, the harmonics generated by itself should be controlled, and the amount of harmonics injected into the power grid should not exceed the allowable value stipulated by national standards.
If conditions permit, high-voltage motors should be selected for motors with power above 200kW.
When the system short-circuit capacity or transformer capacity is small, the high-power motor should adopt constant frequency and variable voltage soft start or other control measures to reduce the starting current to improve the starting characteristics.
In the low-voltage distribution system, it is advisable to choose green and energy-saving combined electrical appliances to reduce the volume of boxes (cabinets) and complicated wiring, which not only saves materials, but also improves the safety and reliability of the system.
The batteries of emergency lighting power supply unit (EPS) and uninterruptible power supply unit (UPS) should be fully enclosed and maintenance-free, so as to avoid environmental pollution caused by liquid leakage.
When diesel generator is used as emergency power supply, it should be selected with small volume, low noise, quick start, energy saving and environmental protection, and complete supporting equipment.
According to the functional format, service floor and service object of the building, the passenger flow situation should be analyzed, and the model, running speed, quantity and control management scheme of elevators and escalators should be reasonably selected. Elevator energy-saving technology should be adopted, and for high-speed elevators, "energy regenerative" elevators should be adopted.
A single elevator should have energy-saving control measures such as centralized selection control, idle stop operation, lighting and automatic control of fans. When two or more elevators are centrally arranged, they should have the group control function of centralized control according to the specified procedures.
Escalators and pedestrian walkways should be equipped with energy-saving traction and energy-saving control devices, and should be suspended or operated at low speed when all sections of the whole line are empty, and should be equipped with start-stop induction devices to automatically control escalators and pedestrian walkways.
Frequency conversion control measures should be taken for pumps and fans that work continuously for a long time.
The cold (heat) source system of air conditioner should adopt energy-saving control measures, including the control of refrigerator according to cold (heat) load and the frequency conversion control of circulating water pump.
Electric heating equipment, such as electric water heater, should be equipped with timing control device.
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