PROBLEM TO BE SOLVED: To provide an electric working vehicle which can detect a ground fault state of both direct current and alternating current while suppressing false detection.SOLUTION: A dump truck 1 has a ground fault detector 22 which detects ground fault on the basis of a ground fault detection voltage V0 which is a difference between detection voltages Vp and Vn where Vp is a detection voltage between a positive electrode line 18A of a DC bus 18 and a neutral point N and Vn is a detection voltage between the neutral point N and a negative electrode line 18B of the DC bus 18. The ground fault detector 22 includes a DC component determination unit 25 which extracts a DC component Vfrom the ground fault detection voltage V0 and determines the ground fault on the basis of the DC component V, and drive frequency component determination units 26 and 27 which extract drive frequency components Vand Vof inverters 17R and 17L from the ground fault detection voltage V0 and determine the ground fault on the basis of the drive frequency components Vand V.SELECTED DRAWING: Figure 3
【課題】 誤検出を抑制しつつ、直流と交流の両方で地絡状態を検出することができる電動式作業車両を提供する。【解決手段】 ダンプトラック1は、直流母線18の正極ライン18Aと中性点Nとの間の検出電圧Vpと、中性点Nと直流母線18の負極ライン18Bとの間の検出電圧Vnとの差分からなる地絡検出電圧V0を検出し、地絡検出電圧V0に基づいて地絡を検出する地絡検出装置22とを備える。地絡検出装置22は、地絡検出電圧V0から直流成分VLdcを抽出し、直流成分VLdcに基づいて地絡を判定する直流成分判定部25と、地絡検出電圧V0からインバータ17R,17Lの駆動周波数成分VLiR,VLiLを抽出し、駆動周波数成分VLiR,VLiLに基づいて地絡を判定する駆動周波数成分判定部26,27と、を有する。【選択図】 図3
ELECTRIC WORKING VEHICLE
電動式作業車両
2018-09-27
Patent
Electronic Resource
Japanese
IPC: | G01R Messen elektrischer Größen , MEASURING ELECTRIC VARIABLES / H02M APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS , Anlagen zur Umformung von Wechselstrom in Wechselstrom, von Wechselstrom in Gleichstrom oder umgekehrt, oder von Gleichstrom in Gleichstrom und zur Verwendung in Netzen oder ähnlichen Stromversorgungssystemen / B60L PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES , Antrieb von elektrisch angetriebenen Fahrzeugen |