1. Install AC reactor and DC reactor. When the capacity of the inverter is greater than 500kva in the distribution transformer, and the transformer capacity is more than 10 times the capacity of the inverter, an AC reactor is installed on the input side of the inverter. When the output voltage of the distribution transformer is unbalanced in three phases and the unbalance rate is greater than 3%, it needs to be installed at this moment
The output of the inverter is controlled by PWM (pulse width modulation, similar to high-speed switching), so a high frequency leakage current will be generated. It is recommended that each inverter should choose a sensitivity current of more than 200mA and the action time is more than 0.1 seconds, but do not ensure that the leakage disconnect will not trip, the following factors must be considered to determine the size of the leakage current of the system, and select the appropriate leakage circuit breaker switch and necessary measures to improve the phenomenon of leakage circuit breaker tripping after power transmission.
Generally, the rated current selection formula of the leakage disconnect switch is as follows:
I△n≧10*〔Ig1+Ign+3*(Ig2+Igm)〕
Ig1, Ig2: The leakage current of the cable during commercial operation.
IGN: The leakage current of the noise filter on the input side of the inverter.
Igm: Leakage current of the motor during commercial operation.
From the relevant variation parameters of the above formula, it is known that the factors that will affect the size of the leakage current are:
(1) Leakage current of the cable (there are two parts)
The leakage current of the cable length of the leakage disconnect switch filter.
The leakage current of the cable length of the inverter motor.
(2) Leakage current of the filter (including the inverter).
(3) The leakage current of the motor.
Leakage current value of each part (unit: mA)
(1) Leakage current of the cable = A* (practice cable length/1000m); The cable manufacturer supplies the leakage current value A per 1000m of each wire diameter.
(2) The leakage current of the filter (including the inverter) - the inverter supplier supply. For example, Delta's VFD055B43B filter is 26TDT1W4B4 and its maximum leakage current is 70mA.
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