magnetic variation,magnetic fluctuation

It is concluded that the single phase grounding faults occurred in low voltage sides of excitation transformer can t be effectively protected by existing protection scheme and may cause improper operation of rotor grounding relay.

发生在励磁变低压侧的单相接地故障无法通过现有的保护方案提供有效保护,但却可能引起转子接地保护的误动。

DQK-1 Type Monitor Controlling Variometer and Tiltmeter;

DQK—1型磁变仪倾斜仪监控器

We have manufactured the calibrator for the variometer used at the geomagnetic station.

研制了地磁台磁变仪标定器。