Contactless on-load automatic voltage regulating system with current limiting resistors

Abstract

The invention provides a contactless on-load automatic voltage regulating system with current limiting resistors. The system comprises a basic winding W0, tapped windings W1, W2, W3 and W4, winding taps 105%UN, 102.5%UN, 100%UN, 97.5%UN and 95%UN, current limiting resistor RG1, RG2 and RG3 of three phases of A, B and C, and AC contactor main contact KM1.1, KM1.2 and KM1.3 connected to the three phases of A, B and C. In the invention, a transition branch formed by series connection of a current limiting resistor R and a solid state relay is connected in parallel with two ends of the solid staterelay, when a tap is changed, the transition branch is firstly connected, then the solid state relay that is conducting is turned off, and next, the transition branch is turned off after the solid state relay connected to the tap to be transferred is triggered, in the entire transform process, each loop has a transition branch, and because of the series connection of the current limiting resistors, the amplitude of the circulation is limited.

Description

technical field [0001] The invention belongs to the technical field of transformer voltage regulation, in particular to a non-contact on-load automatic voltage regulation system with a current-limiting resistor. Background technique [0002] In the prior art, the non-contact automatic voltage regulation mode of chain connection of solid-state relays is adopted. The solid-state relays are connected in chains and connected between the high-voltage winding of the transformer and the neutral point. The working principle of this tap changer is to adopt the technology of directly adjusting the tap. When the solid state relay connected to the adjacent tap is turned on, the solid state relay connected to the current working tap is turned off. Its advantages are: no transition resistance is needed when changing the tap, the impact current is small, it can be operated frequently, no arc is generated, the structure is simple, and it can be directly placed in the transformer oil conserv...

AI Technical Summary

Problems solved by technology

According to the experimental and theoretical analysis, its main disadvantages are: due to the chain connection, too many solid state relays are used, the cost is high, and large harmonics will be generated during the conversion process

Therefore, this pressure regulation method cannot be widely used

[0003] Aiming at the problem that the chain connection of solid state relays is easy to generate harmonics, an on-load voltage regulation method that can avoid harmonic generation has been developed.

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