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Zinc oxide arrester DC parameter tester for zinc oxide leakage current measurement and analysis.
Zinc oxide arrester tester is mainly used to measure the resistive current, in order to analyze the extent of zinc oxide aging and moisture. Field live test in line with the People's Republic of China power industry standard surgery. Can also be used to make the factory test and acceptance test.
Provisions: When the active component of the leakage current increased to 2 times the initial value, should be checked for power failure. Some domestic units to develop some of their own criteria, such as the provisions of some units, when the 330kV zinc oxide surge current resistance of more than 0.3mA, 110 ~ 220kV, MOA resistive current peak value of more than 0.2mA or more than the measured value When the initial value is obviously increased, a blackout test should be conducted to judge the advantages and disadvantages of the insulation.
Low-voltage overhead lines are widely distributed, especially in low-voltage lines erected in the minefield, it is vulnerable to lightning. Meanwhile, low-voltage overhead lines directly into the user, the low voltage equipment insulation level is very low, people have more opportunities for contact, it must consider the lightning along the low voltage line invasion of the house lightning protection measures. The specific measures are as follows:
(1) For general users, a low-voltage lightning arrester or breakdown fuse can be installed at the first support of low-voltage incoming line, and the insulators of the subscriber line can also be grounded. The ground frequency grounding resistance should not exceed 30Ω ;
(2) For important users, it is advisable to install a set of LV arresters in the first 50m of the indoor where the LV lines are introduced, and then install a set of LV arresters after entering the room;
(3) For areas susceptible to lightning strikes, motors or meters connected directly to overhead lines should be retrofitted with low-voltage surge arresters or gap protection. The gap distance can be 1.5 ~ 2mm, or 500V discharge on communication equipment Gap protection
(4) 3 ~ 10kV Y / Y or Y / Y wiring distribution transformers, should be installed in the low-voltage side of a valve type arrester or protective gap. Low-voltage side of the transformer is not grounded neutral situation, should be equipped with breakdown in the neutral safety fuse.
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