Practical sharing: Analysis of voltage fluctuations and flicker and their governance benefits

Voltage fluctuation refers to the periodic changes in voltage amplitude or power frequency voltage envelope within a certain range, or a series of random changes in voltage amplitude not exceeding 0.9-1.1 (p.u.); The voltage fluctuation value is the percentage of the difference between the maximum and minimum root mean square values of the voltage relative to the rated voltage. Voltage fluctuations cause fluctuations in the illuminance of lighting fixtures.

Flicker is a voltage fluctuation value used to indicate the sensitivity of lamps to voltage fluctuations of different frequencies and the degree of stimulation caused by flicker. The definition of flicker is a subjective perception of fluctuations in illuminance by the human eye. The flicker limit caused by user load is determined based on the size of the user load, the proportion of the protocol electricity capacity to the power supply capacity, and the system voltage level. According to the percentage of allowable voltage fluctuations caused by impact loads, the public power supply points of the power system are divided into three levels and subject to different regulations and restrictions.

(1) 10KV and below is 2.5.

(2) 35-110KV is 2.0.

(3) 220KV and above are 1.6.

GB12326-2000 "Allowable Voltage Fluctuations and Flicker in Power Quality" specifically specifies the flicker limit values at all levels of voltage, which are applicable to situations where rapid changes in the voltage of the common connection point caused by fluctuating loads may cause significant human perception of light flicker.

Governance benefits:

1. Ensure the normal operation of equipment and improve product quality;

2. The scrap rate of raw materials has decreased;

3. Improve the service life of equipment;

4. High return on investment for equipment;

5. Reduce maintenance costs;

6. Reduce additional spare parts expenses;

7. Provide high-quality electrical energy, reduce misoperation or refusal of control equipment and relay protection devices, and improve the safety and reliability of power supply;

8. Reduce the additional losses of transformers, lower noise, enhance the load capacity of transformers, and extend their lifespan.

Solution:

Haoanet AVC-RTS Product Introduction

Haoanet AVC-RTS is an effective and cost-effective voltage sag solution that uses extremely fast voltage correction to remove voltage dips and spikes in factory or office power supplies, ensuring that loads continue to operate without interruption.