EI type surge (impact) anti-interference and overvoltage anti-interference low-frequency power supply transformer and machining process

Abstract

The invention relates to an EI type surge (impact) anti-interference and overvoltage anti-interference low-frequency power supply transformer and a machining process. Five layers of polyester enameled wires with the total flux of 170 Ts are wound around a G-shaped framework to form a primary winding; five layers of polyester enameled wires with the total flux of 82 Ts are wound around the surface, where two layers of NOMEX insulating paper I and two layers of polyimide insulating adhesive tape are arranged in sequence in a between-section insulation mode, of the primary winding in a two-wire parallel mode to form a secondary winding, and two layers of NOMEX insulating paper II wrap the surface of the secondary winding; a plurality of E-shaped iron cores are correspondingly overlapped and inserted in holes of the G-shaped framework, and a plurality of I-shaped iron cores are arranged in notches which are each formed by inserting the two corresponding E-shaped iron cores oppositely; a metal support, the iron cores, a primary ground electrode and a secondary ground electrode are fixed together through four bolts; the start ends, the stop ends, the primary ground electrode and the secondary ground electrode of the primary winding and the secondary winding are fixedly connected to a terminal block I and a terminal block II of two beams respectively, and finally the whole is coated with a layer of antirust paint. The transformer has the advantage that the surge prevention level in a low-frequency transformer circuit can be improved without using external devices.

Description

technical field [0001] The invention relates to the structure and processing of a transformer, in particular to an EI type surge (shock) anti-disturbance and overvoltage anti-disturbance low-frequency power transformer and its processing technology. Background technique [0002] There are two main types of EI anti-surge low-frequency power transformers on the market: [0003] (1) The transformer needs to be connected with a reactor externally. [0004] The advantages are: smoothing the spikes contained in the supply voltage and realizing surge (shock) immunity. The disadvantages are: the transformer needs to be connected with an external reactor, the transformer needs to be used in series with the reactor, the volume is relatively large (same frequency, same power), the processing technology is complicated, and the cost will increase by 10%~15%. [0005] (2) The transformer needs to be connected with an SPD (surge protector). [0006] The advantages are: lightning protect...

AI Technical Summary

Problems solved by technology

The disadvantages are: the transformer needs to be connected with an external reactor, the transformer needs to be used in series with the reactor, the volume is relatively large (same frequency, same power), the processing technology is complicated, and the cost will increase by 10%~15%.

[0007] The disadvantages are: the transformer and SPD need to be used together by welding, the process station is complicated, the volume is relatively large (same frequency, same power), and the cost increases by 8%~12%

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