HV HIPOT MOA-505 series zinc oxide arrester tester is specifically designed to detect internal defects such as poor contact between valve plates in gapless zinc oxide arresters (MOAs) used in power systems up to 10 kV, and to measure the DC reference voltage (U1mA) and leakage current at 0.75 U1mA of the MOA.
The specific usage method of the zinc oxide arrester tester is as follows:
1. Open the instrument case and securely ground the instrument housing.
2. Insert one end of the arrester into the high-voltage bushing of the instrument (H terminal), and clamp the other end with a terminal clip. Alternatively, use a dedicated insulated wire to connect the external test specimen from the high-voltage terminal. Note: Do not perform voltage increase under no-load condition.
3. Turn on the power switch. After the instrument performs an internal self-check, the alarm light and discharge light will illuminate, and both meter displays will read zero ±1 digit.
4. Press the reset button, the alarm light will turn off, and the instrument will enter the testing mode, ready for measurement.
5. Press and release the test button after about one second, and the instrument will automatically complete all MOA test items.
Precautions during the use of zinc oxide arrester testers:
(1) If the alarm light turns on when the test button is pressed, it indicates that there is an internal contact defect in the MOA or loose external wiring. After the discharge light turns on, check whether the external connections are secure, or replace the test specimen and then press the reset button to proceed with the next test.
(2) If the alarm light does not illuminate, it indicates that the internal contact of the MOA is good and the wiring is correct. The instrument will automatically proceed to measure U1mA and Id, displaying the test results on the meter head. When the discharge light turns on, the test is complete; then remove the test connections or replace the specimen for the next test.
Post time: Jun-09-2026