Скачать или смотреть The Application of CHIPSENSE Voltage and Current Sensors in Photovoltaic Systems - GFDI

The Application of CHIPSENSE Voltage and Current Sensors in Photovoltaic Systems - GFDI
Multiple photovoltaic cells (PV), connected in series and parallel, form a high-voltage photovoltaic battery pack. Connect the inverter and start grid-connected power generation; connect the MPPT and start charging the battery pack to store energy.
600V and above high voltage PV has a GFDI requirement. GFDI is the abbreviation of Ground Fault Detection Interrupter (Ground Fault Detection and Interruption). Note that it is not a common leakage protection device GFCI (Ground Fault Circuit Interrupter). The purpose of GFDI is not to protect human safety, but to prevent various failures of equipment caused by faulty grounding of equipment - such as power loss, phantom voltage, stray voltage, etc. The purpose of GFDI is to protect equipment.
The key ideas of GFDI are:
1. For the safety of life, it is best to ground the positive end and the metal shell; but this can cause so-called PID (potential-induced attenuation) problems.
2. Negative grounding is an effective means of suppressing PID; however, it is necessary to monitor the leakage current of GFDI to avoid short circuits due to faulty grounding and/or ground faults.
The key objective of GFDI is to detect abnormal grounding risks on the DC side; safety standards such as UL1741 and IEC62109 also require GFDI when the voltage of the photovoltaic system is ≥ 600V, and the fault response time is ≤ 2 seconds.
Here is a GFDI circuit for a high-voltage battery pack that relies purely on a mechanical Breaker to disconnect the system and protect it from faulty grounding.

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