In the live detection of zinc oxide arresters on distribution lines, procurement personnel need to confirm whether the tester can accurately separate the resistive component of leakage current without disconnecting the primary lead. The core capability of the intelligent arrester characteristic tester is developed precisely around this field condition.
Leakage Current Measurement Range and Field Adaptability
During selection, attention should be paid to whether the leakage current measurement range covers 0.1–199.9 μA. This interval corresponds to the resistive current changes of zinc oxide arrester valve discs under normal and damp conditions. If the range is too narrow, the degradation trend may not be fully recorded. At the same time, the starting action voltage measurement range of 10–2000 V can accommodate the reference voltage sampling needs of arresters at different voltage levels.
Ground Loop Series Connection and Shielded Wiring
The test lead adopts a shielded coaxial structure. On site, it is only necessary to clamp the reference voltage to the PT secondary side and connect the current terminal in series with the arrester ground loop. This wiring method reduces the power-frequency interference introduced by long-distance leads. For procurement personnel, this means there is no need to additionally configure isolation units or compensation devices, reducing supporting costs.
Output Power and Repeat Stability
This meter has relatively high output power and can drive longer test leads without significant signal attenuation. It offers good repeat stability, and the one-key measurement operation can reduce differences caused by manual reading. During selection, it is recommended to check the on-site ground loop resistance and the PT secondary load to ensure that reference voltage sampling is not distorted due to excessive load. For procurement personnel, the key is to confirm whether the instrument can maintain consistency in resistive current readings before and after measurement under the substation electromagnetic environment, rather than pursuing the level of a single indicator.
