School energy consumption analysis:
1, transformer
School power supply transformers are mostly oil-encroached transformers, the use of inefficient, coupled with the school hospitals, day and night load changes, transformers most of the time the state of the low load factor The transformer operates under low load most of the time, resulting in high losses and high voltage variations in the transformer itself.
2, power supply lines
The power system is mostly old, old lines, aging devices, there are some unreasonable design, the result is bound to increase the apparent power, there is a large set of skin effect loss and thermal resistance loss, resulting in the use of power efficiency decreased significantly, and there are certain security risks.
3, power equipment
School power equipment is mostly inductive loads, mainly fluorescent lamps, fans, air conditioners, etc., the power factor is mostly in the 0.5-0.8 between the existence of a large number of reactive power loss, not only increases the load on the transformer, but also greatly reduces the system's efficiency of the use of electrical energy.
1, harmonic content
Schools have a large number and types of power equipment, including: lighting (fluorescent lamps, energy-saving lamps, etc.), air conditioning (cabinet or central air-conditioning), fans, experimental equipment, medical equipment, computers, office equipment, electric heating loads and other mixed loads, etc. A large number of power electronic devices (e.g., experimental instruments, medical equipment, computers, office equipment, electric heating loads and other mixed loads, etc.). Which a large number of power electronic devices (such as experimental instruments, medical equipment, computers) and other non-linear loads, will produce a large number of harmonic pollution, so that the voltage waveform distortion, resulting in serious heating of the entire system, that is, consume a large amount of electricity, not only will increase the consumption of electricity, but also affects the normal safety of electricity.
2, voltage fluctuations
System network voltage is not very stable, the equipment in the voltage fluctuations for a long time in the case of operation, resulting in a large amount of wasted power, electronic components and integrated circuits life is also significantly shortened, the increase in the rate of damage to the equipment caused by the increase in the task of overhauling, but also to increase the manpower, the waste of material resources. And to the safe use of electricity has brought a great deal of potential danger, the serious possibility of burning the lines and power equipment.
3, surge, transient serious
Load distribution, power equipment start and stop frequently, current fluctuations are very large, which will lead to a large number of transients and surges in the power system, and feedback to the grid, affecting the normal operation of the power equipment, the line is more seriously polluted due to the quality of the power grid affects the normal use of the equipment, reduces the coefficient of safety of the operation of the equipment, increase the power equipment failure rate, shorten the equipment failure rate. The failure rate of the equipment, shortening the service life of the equipment.
Three, low awareness of energy saving, imperfect management
Currently, schools and hospitals are not enough energy-saving awareness of the whole population, such as "long lights", "standby power", "low-temperature air conditioning "and other phenomena are frequently seen. At the same time, energy management is also along the rough way of management, its starting point is only from the point of view of safeguarding the safety of the equipment, not from the point of view of efficiency and cost of electric energy use for lean management. For example, some of the power supply system is old and aging, facilities do not match, power loss is also barely running, resulting in a lot of security risks, waste is also great.