| 摘要 |
FIELD: electricity. ^ SUBSTANCE: invention relates to the field of electrical engineering and is to be implemented to provide for protection of the stator winding of a generator with a collecting bus output against fault to ground. The invention concept is as follows: the device contains zero-sequence current filter, generator, current-to-voltage converter, zero-sequence current filter, orthogonal component shaper, current-to-voltage converter, line voltage sensor, an orthogonal component shaper, incrementor, orthogonal component shaper, zero-sequence voltage sensor, control unit, zero-sequence voltage sensor and comparison circuit. In accordance with the invention concept the orthogonal component shaper is equipped with a reference signal shaper and two multiplier units (the first one and the second one). The data inputs of the first and the second multiplier units are interconnected and connected to the current-to-voltage converter with the three inputs of the reference signal shaper connected to the three outputs of the line voltage sensor. ^ EFFECT: improvement of the device sensitivity through provision for the device operation immunity to the mains frequency fluctuations and zero-sequence current higher harmonic components. ^ 3 dwg |
