Earth fault monitoring system for DC power supply with IT unearthed system

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Could anyone help me to respond the questions below

1. Can this AC injection method be applied for DC power supply - IT unearthed system ( ie 24VDC ) ?

2. For DC power system with IT unearthed system , will hat injected voltage and low frequency affect or increase the positive and negative voltage supply to loads ( DC voltage swing or ripple ) , then the load still operated or functioned properly ?

Sincerely yours,

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Earth fault monitoring system for DC power supply with IT unearthed system

Earth fault monitoring system for DC power supply with IT unearthed system

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