GROUND FAULT PROTECTION SYSTEMS AND METHODS

摘要

A ground fault protection system is disclosed. The ground fault protection system may include a controller that is configured to receive signals representing a ground fault detection voltage and a DC link voltage of the machine. Based on the ground fault detection voltage and the DC link voltage, the controller may determine a ground fault detection percentage value. Based on the ground fault detection percentage value and the DC link voltage, the controller may further determine a worst case component insulation voltage. The controller may compare an absolute value of the worst case component insulation voltage with a rated insulation voltage of a component of the machine. When the absolute value of the worst case component insulation voltage is higher than the rated insulation voltage, the controller may determine a new DC link voltage based on the rated insulation voltage and the ground fault detection percentage value, and may output a signal for operating the machine by using the new DC link voltage.

主权项

1. A system for protecting a machine under a ground fault condition, comprising:
one or more memories storing instructions; and one or more processors configured to execute the instructions to: receive signals representing a ground fault detection voltage and a DC link voltage of the machine; determine a ground fault detection percentage value based on the ground fault detection voltage and the DC link voltage; determine a worst case component insulation voltage based on the ground fault detection percentage value and the DC link voltage; compare an absolute value of the worst case component insulation voltage with a rated insulation voltage of a component of the machine; and when the absolute value of the worst case component insulation voltage is higher than the rated insulation voltage, determine a new DC link voltage based on the rated insulation voltage and the ground fault detection percentage value, and output a signal for operating the machine by using the new DC link voltage.