Harmonics is currently one of the thorny issues for the power sector in Vietnam. In addition to manufacturing plants, commercial buildings such as supermarkets, apartments, offices for rent, etc. also have equipment that generates harmonics that affect the equipment in buildings and grids. So what are these devices and what are the harms to buildings?
Downloads in commercial buildings can be categorized in three categories: the first type are power supply cabinets for lighting systems and other harmonic-generating loads such as UPS systems and personal computers; The second type is the elevator system (usually with frequency inverter) - the main cause of harmonics in buildings; The third type is for conventional loads such as heating and electricity.
Diagram of a conventional power system fiber of a building
Electric shock waves are caused by nonlinear loads connected to the grid. Nonlinear loads are usually electronic devices such as personal computers, UPSs, speed governors, etc. These devices produce current harmonics and bring them into the electrical network, in addition to That kind of fluorescent bulb produces a lot of 3rd harmonic. Harmonic wave 3 is quite harmful because it accumulates in the neutral conductor system and damages the voltage.
Problems caused by harmonics:
• Reduced capacity.
• Conductor and neutral conductor generate heat loss of power.
• Harms the transformer.
• Affecting capacitor banks (bulging, hot, potentially explosive)
• Interferes with the control, communication and monitoring systems.
Solution - Active Zeon Filter and Voltage Stabilizer UPQ:
Harmonic filter and UPQ voltage stabilization are connected in parallel with the compensated load. Active filters with modern systems can detect and eliminate harmonics up to level 50, reactive power compensation, and also provides temporary power supply for critical equipment in the event of a fault. Help the system to operate in the most stable way