Application Note www.megger.com Test results and recommendations A test was done on a selection of 15.3 kV rated surge arresters. The test parameters were: • 15 kV applied test voltage • 30 seconds of applied test voltage each time • No filters of special settings used • 3 tests were done on each arrester, but only after fully discharging each time • PASS/FAIL level was determined to be 1 GΩ based on manufacturer’s information Arrester ID Test 1 (MΩ) Test 2 (MΩ) Test 3 (MΩ) Average (MΩ) Result 12001 839 919 909 889 FAIL 12003 1115 1212 1206 1178 PASS 12004 1190 1174 1146 1170 PASS 12008 999 1066 1038 1034 PASS Table 1: Test results for a selection of 15.3 kV surge arresters It is highly recommended to check surge arresters regularly. The test for them is simple and quick, and it needs to be done. A faulty arrester can result in severe damage to expensive assets, like transformers. Therefore, regularly following the simple process from this application note can save money and maintain a smooth and steady electric power supply.
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