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.