发明名称 |
Insulation deterioration diagnosis apparatus |
摘要 |
The invention is related to an insulation deterioration diagnostic apparatus for an electric path connected between an inverter device and an inverter-driven load device, including: a zero-phase current transformer having an annular magnetic core, a magnetizing coil wound around the magnetic core, and a detecting coil wound around the magnetic core, the transformer being for detecting a zero-phase current of an electric path; a magnetization control circuit for supplying an alternating current having a frequency at least twice as high as a drive frequency of the load device to the magnetizing coil to magnetize the magnetic core; and a frequency extracting circuit for extracting a frequency component identical to the drive frequency fd, from the output signal of the detecting coil, whereby precisely measuring a current leaking from an inverter-driven load device over a wide range of frequencies. |
申请公布号 |
US9030210(B2) |
申请公布日期 |
2015.05.12 |
申请号 |
US201113582758 |
申请日期 |
2011.04.04 |
申请人 |
Mitsubishi Electric Corporation |
发明人 |
Watanabe Yoshimasa;Kaneda Yoshiharu;Nishizawa Hiroshi;Oka Toru |
分类号 |
H01H31/12;G01R31/02;G01R31/14;H01H31/02;G01R31/34;G01R31/40 |
主分类号 |
H01H31/12 |
代理机构 |
Oblon, McClelland, Maier & Neustadt, L.L.P. |
代理人 |
Oblon, McClelland, Maier & Neustadt, L.L.P. |
主权项 |
1. An insulation deterioration diagnostic apparatus for an electric path connected between an inverter device and an inverter-driven load device, comprising:
a zero-phase current transformer having an annular magnetic core, a magnetizing coil wound around the magnetic core, and a detecting coil wound around the magnetic core, the transformer being for detecting a zero-phase current of an electric path; a magnetization control circuit for supplying an alternating current having a frequency at least twice as high as a drive frequency of the load device to the magnetizing coil to magnetize the magnetic core; and a frequency extracting circuit for extracting a predetermined frequency component from an output signal of the detecting coil; a detector for detecting one of a current waveform or a voltage waveform supplied to the load device, wherein the magnetization control circuit controls the current supplied to the magnetizing coil based on an output signal of the detector. |
地址 |
Tokyo JP |