Method for measuring resistance of ground wire of transformer
A measurement method and grounding wire technology, applied in the direction of grounding resistance measurement, etc., to achieve the effect of improving accuracy, reducing influence and improving precision
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[0022] The specific implementation process of the present invention will be further described below in conjunction with the drawings and specific examples, but the scope of the present invention will not be limited in any way.
[0023] In order to reduce the error of ground wire resistance measurement, it is necessary to remove the induced voltage value caused by the interference current on the ground wire. If the induced voltage value caused by the interference current on the ground wire can be measured and this factor is taken into account, a relatively Accurate ground wire resistance value.
[0024] Such as figure 2 As shown, the voltage generated by the interference current on the ground wire on the response coil is set as Ug, and the calculation formula can be revised as formula 2 Rx=Ui×Ro / (N×n×(Uo-Ug)). The current induced voltage Ug of the ground wire can be measured when the excitation current is not added to the excitation coil, and the accurate ground wire resistan...
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