”Do voltage fluctuations cause current fluctuations in high and low voltage motors?
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”Do voltage fluctuations cause current fluctuations in high and low voltage motors? High-voltage system: 6000V; Low-voltage system: 380V. Event: Lightning caused voltage fluctuations in the power grid, with an interval of one second between occurrences. DCS motor current trends show: High-voltage motors: 8:0:1 – stable current; 8:0:2 – low current level; 8:0:3 – stable current. For one of the high-voltage motors with soft start: 8:0:1 – stable current; 8:0:2 – low current level; 8:0:3 – sharp current spike; 8:0:4 – stable voltage. Low-voltage motors: 8:0:1 – stable current; 8:0:2 – sharp current spike; 8:0:3 – stable current. There are 4 transformers with a capacity of 2000 KVA between the high-voltage and low-voltage systems. Question: 1. At 8:0:2, why did the low-voltage current increase while the high-voltage current decreased? 2. At 8:0:3, why is the low-voltage current stable, the high-voltage current stable, while the current of the high-voltage soft-start motor shows spikes? Seeking expert assistance to understand this phenomenon
Could everyone please offer some guidance? ?
You can contact the manufacturer for inquiries. My speculation: 8:0:2. Lightning is generated, creating a high-voltage circuit; the induced voltage causes the circuit voltage to rise, which in turn leads to a decrease in current in the high-voltage motor. I don’t really understand either; it’s just my opinion. No, please don’t criticize me.