Zinc oxide varistor selection

Selection of TGE Glass Coating varistors before, you should first understand the following related technical parameters: Nominal voltage is at a predetermined temperature and DC flow, voltage across the varistor. Leakage current is at 25 ℃, when the application of the maximum continuous DC voltage, varistor flowing current value. Level refers mov metal oxide varistor voltage by 8/20 rating current pulses at both ends exhibit voltage peaks. Through traffic is applying a predetermined peak current pulse current (8 / 20μs) waveform when. Surge environmental parameters include a maximum inrush current Ipm (or the maximum surge voltage and surge Vpm source impedance Zo), surge pulse width Tt, the minimum time interval of two adjacent surge Tm and scheduled TGE high voltage varistor working life period, the total number of surge pulses N and the like.

Works zinc oxide varistor

TGE varistor metal oxide is a resistor made of zinc oxide in Taiwan is called the surge absorber, zinc oxide TGE metal oxide varistor application voltage because of the change in resistance has nonlinear way (positive and negative) also symmetry, and Can abnormal voltage response line, absorbed most of the surge / surge energy while suppressing the abnormal voltage to a safe range so that safety and stability to improve lines, and thus subject to many areas of favor.

Zinc oxide use

Another major use of zinc oxide is used as a coating, 1834, for the first time became the watercolor, but insoluble in oil. But soon the problem will be solved by a new zinc oxide production process. In 1845, Leclair began mass production of zinc white oil paint in Paris, 1850, zinc oxide became popular throughout Europe. High purity zinc oxide, so that in the 19th century, some artists painted zinc white as a background in painting, but these paintings have appeared through the crack years later.

Oxide surge arresters a Note

Glass Coating MOV leakage current meter are provided online, in order to monitor the health of the arrester. Live leakage ammeter reflected by external current and porcelain valve arrester currents through the insulation and arrester valve disk.

(1) Lightning Online abnormal increase in leakage current meter reading

Moisture within the metal oxide arresters is mainly caused by bad seal. Moisture sources are:

① the arrester production process, installation humidity exceeded;

② valve and internal parts drying is not complete, some moisture retention;

③ when assembling the seal leak put, put side. Or between the seal and the seal cover folder porcelain debris.

④ run after a period of damage caused by the sealing member into the tide.

(2) Lightning-line leakage current meter reading to reduce or even zero.

Zinc Oxide arresters

Zinc blocks hydroxide is an inorganic compound with the chemical formula Zn (OH) 2, are amphoteric hydroxides. Zinc hydroxide by one divalent zinc and two hydroxide ions. At room temperature as a white solid, insoluble in water. It can be applied to the arrester MOA called oxide surge arresters according to the structure can be divided into two categories;
Porcelain jacket; porcelain Glass Coating MOV by anti-contamination performance is divided into four grades, Ⅰ level for the ordinary type, Ⅱ grade for use in moderate polluted areas (creepage distance of 20mm / KV), Ⅲ grade for use in heavy contamination areas (creepage distance of 25mm / kV), grade Ⅳ is for Severely dirty areas (creepage distance of 31mm / kV).
Composite coat; composite jacket MOA is a composite material made of silicone rubber jacket, and use high-performance zinc oxide varistor, using a special internal structure, assembled with advanced technology methods, with silicone rubber material and the zinc oxide varistor dual advantages. This series of products in addition to having all the advantages of porcelain coat MOA, the other having insulation properties, high resistance to contamination performance, excellent explosion-proof performance and small size, light weight, usually maintenance free, unbreakable, reliable sealing, anti-aging Excellent

Zinc oxide block in Reactive power compensation energy-saving devices in the

In order to limit the instantaneous capacitor cut dangerous overvoltage arrester is commonly connected between the conductor and the ground, in parallel with the protective equipment. When the protected equipment operating at normal operating voltage, lightning does not move, that is regarded as disconnection. If an over-voltage, and is threatening the protective equipment insulation, surge arresters immediate action, the impact of high voltage current to the earth, thereby limiting the voltage amplitude, the protection of electrical equipment insulation. When the overvoltage disappears, the arrester rapid restitution, enabling the system to normal supply, the role of lightning is a discharge gap through a parallel or non-linear resistance to the role of cut pieces of the invasion wave flow, reduce equipment to be protected by the overvoltage value. Surge arresters can be used to protect the atmosphere over-voltage, also be used to operate the overvoltage protection. Effect is to limit overvoltage arrester to protect electrical equipment.
Zinc blocks selection and installation, should be based on their connections, possible over-voltage times capacitor capacity and surge capacity may check; lOkV voltage level and the complement system, the Zinc Oxide discs should normally be connected to the "phase one between the land ", the characteristics of this wiring arresters are higher, such as when a phase to ground fault occurs, the two non-fault phase arrester three-phase capacitor must withstand the impact of savings overvoltage, phase overvoltage We had to be subject to two levels of protection on the ground arrester residual voltage of algebra and the like, which is the inadequacy of the wiring pattern.

History of zinc oxide

ZnO blocks The other main use is as a coating in 1834, first became watercolors, but insoluble in oil. But soon the problem will be solved by a new Zinc Oxide blocks production process. In 1845, Leclair began mass production of zinc white oil paint in Paris, 1850, zinc oxide became popular throughout Europe. High purity zinc oxide, so that in the 19th century, some artists painted zinc white as a background in painting, but these paintings have appeared through the crack years later.

In the second half of the 20th century, Zinc Oxide discs is used in the rubber industry. In the 1970s, the second largest use of zinc oxide is copy paper additives, but in the 21st century as zinc oxide copy paper additives practices have been eliminated.
November 1, 2008 to 15, the researchers gave mice fed a combination of protein such particles, successful shot to particles in the mice glowing image.