| 摘要 |
A device for the evaluation of the voltage status of an electric grid, which has a power supply, a voltage sensor containing a voltage reference and a comparator and a recording component, characterized in that the voltage sensor (2) is a differential circuit fitted with a grid voltage block (3) and the voltage reference (4), whereas the recording element (5) consists of a time counter (6) connected with the impulse counter (7).<IMAGE>
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