The so-called booted is the main transformer high-voltage three-phase coils of the neutral point on, respectively, the series compensator (ie SZZ7 type neutral point OLTC) of the voltage regulator coil, transformer and low voltage side of the main Step Up Transformer and compensation excitation coils in parallel, to achieve load tap. The voltage regulator is based on the principle of superposition, the voltage regulator compensator by means of OLTC, the main transformer high voltage side of the coil to maintain the voltage within the rated voltage.

In this way the regulator, compensation under the run-time only neutral or N-level voltage regulator Σ △ U1, require low levels of insulation, when the transformer neutral grounding in running a large current, the insulation level only for the 35kV enough (we design and manufacture according to 40kV), also can be designed to run way higher insulation levels. This method of just a single point of making a medium-voltage regulating transformer, transform low-cost, on the main transformer neutral point leads to the transformation of the scene can be completed in just one business day, if combined with the main transformer overhaul at the same time, basically not to increase the overhaul period .

Booted way for voltage fluctuation range is beyond the scope of non-excitation voltage regulator, which is no excitation regulator switch gear in the most high-end or when they can not reach most low voltage qualification requirements. We use the neutral point OLTC can achieve ± 12% U1N wide range of voltage, if the main switch with the change of the original non-excitation, can be more easily moved up and down regulating range (no range of excitation voltage regulator) to meet the actual needs of the regulator, and improve the main transformer output.

Meanwhile, according to the actual situation to determine the scope of the regulator to configure the neutral point OLTC, its capacity configuration shown in Table 1, all kinds of voltage transformers are suitable for transformation. We completed four main Isolation Transformer of the task of transformation, are listed in Table 1, transformed. But this method to increase the area of ​​a transformer, a wiring is slightly more complicated, but the entire transformation period and look to save and invest, after all, a more economical and reasonable rehabilitation programs.