Combined voltage transformer with zero-sequence voltage output function

Abstract

The invention discloses a combined voltage transformer with a zero-sequence voltage output function, which comprises a double-voltage-transformer combination formed by connecting two voltage transformers in a V-V wiring mode. Each phase of high-voltage input end of the double-voltage-transformer combination is connected with a capacitive voltage divider; the capacitive voltage divider is connectedwith one end of the output capacitor through a circuit; the other end of the output capacitor is a zero potential end; the output capacitor is connected with the input end of an adjusting module in parallel, the adjusting module can adjust and compensate the voltage of the output capacitor; and the output end of the adjusting module is a zero sequence voltage signal output end. The combined voltage transformer with the zero-sequence voltage output function has the advantages that the three-phase capacitive voltage divider is introduced into the voltage transformer combination connected in a V-V wiring mode, so that the double-voltage-transformer combination can provide zero-sequence voltage signals on the premise that the boundary dimension is kept unchanged, the structure is simple, theoccupied space is small, and the manufacturing cost is low; the breakdown fault probability is low, early warning can be performed in time, and the maintenance and replacement efficiency is very high.

Description

technical field [0001] The invention relates to the technical field of voltage transformers, in particular to a combined voltage transformer with a zero-sequence voltage output function. Background technique [0002] There is an existing Chinese utility model patent with the application number CN201420836461.8 titled "Combined Voltage Transformer for Ring Main Units", which discloses a combined voltage transformer for Ring Main Units, including voltage transformer coils and casting bodies. It is to set two voltage transformer coils inside the casting body, and the two coils are connected in a V-V mode to form a three-phase combined voltage transformer. The cable connector of the ring network cabinet with the hole is closely matched, and a fuse electrically connected to the transformer coil and the cable connector is arranged in the cone. Its characteristics are: the product is small in size and light in weight. The primary high-voltage terminal is located in the cable elbow...

AI Technical Summary

Problems solved by technology

However, the voltage transformer cannot provide zero-sequence voltage signal, so the structure of the voltage transformer needs to be further improved

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