Street lighting energy saving retrofit plan

First, the status quo of electricity

Ø The first phase of the new campus living area has 92 street lights, 150W metal halide lamps, 36W T12 fluorescent lamps as effect lights, and the power consumption of the rectifier. The active power of each street lamp is about 210. Tile, the total power is about 20KW;

Ø Lighting time is generally from 6 pm to 6 am the next morning;

Ø The voltage is generally around 400V, which is higher in the latter half of the night;

Ø The power factor is about 0.85, which has a large room for improvement;

Ø 3rd and 5th harmonics are more serious, exceeding the standards set by the state;

Ø Three-phase unbalance is more serious and has a larger zero-sequence current;

Ø Using simple control, there is a big waste;

Ø Lack of corresponding maintenance regulations and poor maintenance.

Second, the solution

Traditional energy saving measures are generally:

ü turn on the light;

ü time-phase control;

ü single lamp compensation;

ü Replace the light source with high light efficiency.

Some of the above methods have large investments, and some are not ideal energy-saving measures at the expense of comfort.

According to the modern energy-saving concept, “the province is not as good as the province”, it is recommended to adopt the intelligent three-phase terminal control system (UPC-D) for electrical efficiency transformation, which can receive obvious energy-saving effects.

Third, the analysis of energy saving principles

1. Factors affecting power efficiency:

Whether the power system and the electrical equipment can operate cost-effectively depends on the quality of the power supply and the quality of the power used. The power quality refers to the fluctuation of the power supply voltage, the advantages and disadvantages of the waveform, and the harmonic component. The power quality refers to the power efficiency of the power equipment. Specifically, it can be analyzed from the following aspects:

u Power supply voltage: In the power supply and distribution system, the power supply department often adopts a method of increasing the transmission voltage in order to avoid or reduce the loss during power transmission and to relieve the voltage of the end user when the load peaks, so the user side or The actual voltage on the equipment side is often higher than the rated voltage of the electrical equipment, and the fluctuation range is about ±10%. Excessive supply voltage can not only make equipment or power energy economically and efficiently operate, but increase electricity expenses, and shorten the life of equipment, increase equipment maintenance and maintenance costs. Due to the long line characteristics of the street lamp system, the voltage on the output side is high. The operation of the street lamp is subject to an overvoltage of 230-240V. It is known from P=U2/R that the power consumed by the electrical equipment is proportional to the square of its voltage. The voltage is increased, a large amount of electric energy is wasted, and the lamp is operated under the condition of overvoltage for a long time, and the life of the lamp and the rectifier is obviously shortened (generally, the rated voltage exceeds 1%, the service life of the light source is reduced by 6%), causing the lamp The increase of the failure rate; at the same time, the increase of the failure rate will inevitably lead to an increase in maintenance tasks, resulting in further waste of human and material resources.

u Three-phase balance of power supply: Under normal circumstances, the power equipment should work under the condition of three-phase load current balance and three-phase voltage symmetry, so that the whole power system is the most economical. But in fact, most of the electricity systems have three-phase imbalance problems. Due to the imbalance of the three-phase power supply, the zero-sequence current is too large, the zero-point displacement and the three-phase voltage are asymmetrical, which will cause the line power loss to increase, several times or even ten times larger than the basic loss, which is a link that cannot be ignored. To overcome.

u Harmonics and power factor: Harmonics greatly reduce the efficiency of the production, transmission and use of electrical energy; the line power factor is low, resulting in increased line losses.

2. Ways to solve the above problems:

In view of the above problems, in order to effectively improve the electrical energy efficiency of the lighting system, there are basically three methods:

n Use high-efficiency light sources: Increase the illuminance with efficient lighting fixtures.

n Intelligent lighting: It is an intelligent lighting system that solves the problem of midnight light. It provides a self-applied lighting system that meets the pedestrian's visual requirements according to the brightness of the road and surrounding environment.

n Reduce line loss: It can reduce the line pollution and energy efficiency caused by line loss and rectification with the lowest loss.

Third, the introduction of intelligent three-phase terminal control system (UPC-D)

1. System overview

A company provides intelligent three-phase terminal control system with full solid-state microprocessor control, three-terminal dual-phase thyristor structure and no-turn waveform cutting technology, which makes the current through the luminaire effectively reduce the waveform more smoothly and evenly; ensuring stable operation of the light load. Illumination loss is minimized. When the voltage is full, the thyristor is in a short-circuit state to reduce unnecessary loss, minimize harmonics and radio frequency interference, achieve maximum energy saving effect, and prolong the service life of the lamp and reduce maintenance costs. It is mainly designed for power-saving control of various types of lights. It can continuously monitor and modulate AC sine waves. Through its unique software control, it can effectively realize the functions of power saving and balanced output power. And the installation is flexible and easy, and the return on investment is high. The enclosure is well ventilated for harsh industrial environments.