Power frequency current generating device for verifying on-line iron core monitoring system

• Main Authors: WU ZHUOJUN, CHEN XIANXI, WANG ZHIJIAO, LIU SONG, LIU SHAOHUI, LAI YANSHAN, LI GUOWEI, LI LANYIN, LIANG NIANBAI, LIU HAO, WANG YUNFEI
• Format: Patent
• Language: Chinese; English
• Published: 03.02.2023
• Subjects: MEASURING; MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES; PHYSICS; TESTING

The invention relates to the technical field of transformers, and discloses a power frequency current generating device for verifying an iron core on-line monitoring system, which is characterized in that a first transformer is used for carrying out voltage transformation on commercial power, a polarity change-over switch is used for adjusting the polarity of compensation current, and a phase shift circuit is used for changing the phase of the compensation current; the amplitude of the compensation current is adjusted through the power amplifier circuit module, and finally the compensation current which is the same as the iron core current in phase and amplitude and opposite to the iron core current in polarity is output to the grounding wire of the external transformer iron core through the compensation current output end, so that the grounding current of the grounding wire of the external transformer iron core is counteracted; and the required verification current is output to the grounding wire of the tran