Electric potential compensation process for reducing neutral point direct current of high-voltage grid transformer
A transformer neutral point, DC current technology, applied in transformer/inductor circuits, emergency protection circuit devices for limiting overcurrent/overvoltage, electrical components, etc., can solve the problem of affecting the effective grounding of transformers and affecting the insulation of main transformers and protection devices, accelerated grounding grid corrosion and other issues, to achieve the effect of intuitive and scientific compensation principle
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Embodiment 1
[0019] Use the method of the present invention to reduce the DC current at the neutral point of a high-voltage grid transformer. As shown in Figure 1, a controllable potential compensation device is connected in series between the neutral point of the power transformer and the grounding electrode. A controlled bidirectional current source, compensating resistor R1 and shunt resistor R2 form a series loop, in which the compensating resistor R1 is connected in series between the neutral point of the grounding transformer and the grounding electrode, and the compensating resistor R1 is connected in parallel with a bypass protection capacitor C and a manual The bypass circuit; at the same time, it is equipped with a measuring unit (transformer neutral point DC monitor), a control unit and a protection unit; the measuring unit measures the neutral point DC current of the transformer, and obtains the neutral point DC current value and direction; the measuring unit and The control uni...
Embodiment 2
[0021] This embodiment is an example of setting independent potential compensation devices for two transformers #1 and #2 in the same substation to reduce the neutral point DC current of the two transformers, as shown in FIG. 2 . The potential compensation devices and related devices provided by the two transformers are basically the same as those in the first embodiment. Due to the network structure, the DC currents of the neutral points of #1 and #2 transformers are respectively 26.45A and 37.61A, which are somewhat different.
[0022] The experiment of suppressing the neutral point current of two transformers by using the potential compensation method of the present invention includes implementing potential compensation to only one transformer and implementing potential compensation to two transformers at the same time.
[0023] See Table 1 for the effects of suppressing the neutral point currents of the two transformers through the potential compensation method of the pres...
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