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Контекст, конечно, есть, хотя не знаю, поможет ли: The low power transmission tests are a basic set of verifications that shall be conducted when the converter terminals are connected for the first time with the HVDC transmission circuit.
Since power will be transmitted, tests arrangement shall limit the potential impact to the HVDC system equipment and to the interconnected AC systems. Preconditions:
- Converter station tests for each station shall have been completed.
- Earth electrodes and earth electrode lines shall have been checked and cleared.
- The overall test procedures, safety rules, dispatch co-ordination and test responsibilities shall have been established. Других упоминаний электродов в тексте нет. Зато на блок-схеме присутствуют пункты Monopolar earth return и Monopolar metallic return, то есть заземление вроде как присутствует.
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