Antiresonant three-phase four-wire integrated casting insulated mutual inductor

Abstract

The invention discloses an antiresonant three-phase four-wire integrated casting insulated mutual inductor. In the mutual inductor, terminals of primary winding coils of three voltage mutual inductors are mutually electrically connected, and the other terminals of the primary winding coils are respectively connected to primary connecting terminals; winding coil measuring tail ends of secondary sides of the three voltage transformers are mutually connected and used as grounding ends, and start ends thereof are respectively connected to secondary connecting terminals; protective winding coils of the secondary sides of the three voltage transformer are sequentially, serially and electrically connected in an opened triangle pattern, damping resistors are connected in series among the openings of the opened triangle, and output ends of the opened triangle formed by the serial connection are respectively connected to the secondary connecting terminals; and the three voltage mutual inductors are cast by insulation materials to form a fully enclosed casting body arranged in a shell. The mutual inductor can effectively absorb high order harmonic elements of secondary circuits by the damping function of the damping resistors so as to prevent the output circuit from resonance and prevent the transformer from being burnt down due to the ferromagnetic resonance.

Description

technical field [0001] The invention relates to a voltage transformer, in particular to an anti-resonance three-phase four-wire integrated casting insulation transformer. Background technique [0002] At present, there are only 10KV oil-immersed transformers for three-phase four-wire integrated voltage transformers in China, but this type of product uses insulating oil as the insulating medium, which is prone to oil leakage during use, requires frequent maintenance, and is inconvenient to maintain; oil-immersed When the transformer is designed without damping resistance inside, it is easy to cause ferromagnetic resonance and cause the transformer to burn out. Contents of the invention [0003] Based on the above-mentioned problems in the prior art, the embodiment of the present invention provides an anti-resonance three-phase four-wire integrated cast insulated transformer, which can effectively absorb the high-order harmonic components of the secondary circuit of the tran...

AI Technical Summary

Problems solved by technology

[0002] At present, there are only 10KV oil-immersed transformers for three-phase four-wire integrated voltage transformers in China, but this type of product uses insulating oil as the insulating medium, which is prone to oil leakage during use, requires frequent maintenance, and is inconvenient to maintain; oil-immersed When the transformer is designed without damping resistance inside, it is easy to cause ferromagnetic resonance and cause the transformer to burn out

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