Capacitive switching control method for inhibiting zero sequence and negative sequence current of distribution transformer
A distribution transformer and negative-sequence current technology, which is applied in the field of power systems, can solve problems such as prone to overcompensation and failure to consider the influence of distribution transformer governance effects
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Embodiment 1
[0031] Example 1 figure 1 , A capacitive switching control system that suppresses the zero-sequence and negative-sequence currents of distribution transformers. It consists of a voltage transformer 11, a current transformer 12, a front-end processing circuit 13, a central processing unit 14, a capacitor adjustment cabinet 15, and GPRS communication The module 16 and the upper computer 17 are composed of the voltage transformer 11 and the current transformer 12 of the power quality acquisition unit to collect the voltage, current and neutral current signals of the transformer during operation, and transmit the collected signals to the central processing unit 14, the central processing unit 14 Calculate the voltage, current, and power factor based on the collected signals, and consider the harm of over-compensation to the distribution transformer, calculate the effective capacitance adjustment, obtain the control signal of the capacitance adjustment cabinet 15 and control the actio...
Embodiment 2
[0032] Example 2, suppose that the three-phase voltage on the low-voltage side of the distribution transformer at this time is = = =220V, the phase difference is 120 degrees, the three-phase current and power factor are respectively =11.9A, =23.2A, =10.3A, =0.92, =0.96, =0.73, the load is inductive, the reference capacity of the capacitor adjustment cabinet is 1kvar, and the adjustment range of the phase-to-phase and phase-to-ground reactive power adjustment is 0kvar to 7kvar.
[0033] According to formula (1), the three-phase active power on the load side is:
[0034] =2.4kw, =4.9kw, =1.7kw;
[0035] According to formula (2), the inductive reactive power on the load side is:
[0036] =-1.0kvar, =-1.4kvar, =-1.5kvar;
[0037] At this time, the negative sequence current is 5.1A, and the zero sequence current is 3.7A. According to the formula (3), the reactive power adjustments that should be compensated between the phases and the corresponding ground after preliminary opti...
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