35 kV line high voltage surge arrester models and parameters
Zinc oxide arrester model parameter selection The role of the arrester is to protect various electrical equipment in the power system from damage caused by lightning overvoltage, operating overvoltage, and power frequency transient overvoltage impact. The main types of arresters include protection gaps, valve-type arresters and zinc oxide arresters. The protection gap is mainly used to limit atmospheric overvoltage, and is generally used to protect power distribution systems, lines and substation incoming line sections. Zinc oxide arresters make use of the good nonlinear volt-ampere characteristics of zinc oxide, which can make the current flowing through the arrester only a few microamps or milliamperes under normal operating voltage; when overvoltage occurs, the resistance drops sharply and discharges the energy of the overvoltage to achieve a protective effect. The difference between zinc oxide arresters and traditional arresters is that it has no discharge gap and cleverly utilizes the nonlinear characteristics of zinc oxide to achieve the functions of discharge and breaking.
High voltage arrester manufacturer
2. Zinc oxide arrester adoption standards and conditions of use
Adopt standards
GB11032 "AC gapless metal oxide arrester"
JB/T8952 "Composite jacketed gapless metal oxide arrester for AC 35kV and below"
IEC99-4 "Gapless metal oxide surge arresters for AC systems"
Production and testing can also be organized according to user requirements.
According to the normal operating conditions of the arrester according to the national standard
(1) The ambient temperature is not higher than +40℃ and not lower than -40℃;
(2) The radiation intensity of sunlight is 1.1KW/m2;
(3) The altitude does not exceed 2000m;
(4) The frequency of the power supply is not less than 48Hz and not more than 62Hz;
(5) The power frequency voltage applied between the arrester terminals for a long time should not exceed the continuous operating voltage of the arrester;
(6) Areas with earthquake intensity of 8 degrees and below;
(7) The maximum wind speed does not exceed 35m/s.
Abnormal operating conditions of lightning arresters can be negotiated between the supply and demand parties.
