On the relationship between the main circuit current and the branch circuit current of electric heaters
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Dear sea friends, there are two sets of electric heaters. The ammeter measures the current in the main circuit; when each heater is turned on individually, the ammeter shows 34 A and 43.5 A respectively. However, when both sets of heaters are operating at the same time, the ammeter reads 55 A, which is much lower than the sum of the currents when each heater is used alone. What could be the reason for this?
Could it be that the voltage drops when both are turned on at the same time?
How are the two sets of electric heaters connected? In parallel? Are ammeters available in each set of electric heaters, or only on the main circuit?
The electric heater should have preheating and heat retention functions. At the start, both sets are in operation; once the desired temperature is reached, one set stops working, leaving only one set active, which is why the measured values differ
With two contactors used separately and a sufficient capacity for the main power supply, voltage drop should not occur
The two groups of electric heaters are connected in parallel; the ammeter is located on the bus line that results from this parallel connection, and it is only present on the main line
I’m asking experts to take a look for you @yaohero @zhushuai
Draw it clearly. Consider whether your heater is connected in star or delta configuration