Loop for realizing locking of bypass cabinet of frequency converter

Abstract

The invention discloses a loop for realizing locking of a bypass cabinet of a frequency converter. The loop comprises a bus, motors A and B, single-pole double-throw isolation knife switches QS1 and QS2, four high-voltage charged display instruments DXN1, DXN2, DXN3 and DXN4, and three power switches QF1, QF2 and QF3, wherein the motor A and the motor B are respectively connected with the single-pole double-throw isolation knife switches QS1 and QS2; a first end of the single-pole double-throw isolation knife switch QS1 is sequentially connected with the high-voltage charged display instrument DXN1 and the power switch QF1, a first end of the single-pole double-throw isolation knife switch QS2 is sequentially connected with the high-voltage charged display instrument DXN3 and the power switch QF3, second ends of the single-pole double-throw isolation knife switch QS1 and the single-pole double-throw isolation knife switch QS2 are jointly connected to the high-voltage charged display instrument DXN2, and the DXN2 is sequentially connected with the frequency converter, the high-voltage charged display instrument DXN4 and the power switch QF2; and the power switches QF1, QF2 and QF3 are respectively connected to different buses. By optimizing the locking loop of the bypass cabinet of the frequency converter, the operation safety of the personnel under various conditions is ensured, and personal and equipment accidents caused by misoperation of the personnel are prevented.

Description

technical field [0001] The invention relates to the technical field of frequency converter control equipment, in particular to a circuit for realizing the locking of a frequency converter bypass cabinet. Background technique [0002] With the continuous development of industrial technology, inverters are widely used in various industries. The inverters with one-to-two design have many operation items and complicated processes when switching between power frequency conversion and frequency conversion. The road cabinet uses the auxiliary contact of the isolated knife switch to lock the operation circuit, and accidents of personnel misoperation often occur due to poor quality of the auxiliary contact and unreasonable design of the locking logic. [0003] At present, the mainstream inverter bypass cabinet uses the auxiliary contact of the isolated switch to block the operation circuit. The blocking principle is that when the switch on one side is in the frequency conversion posi...

AI Technical Summary

Problems solved by technology

[0002] With the continuous development of industrial technology, inverters are widely used in various industries. The inverters with one-to-two design have many operation items and complicated processes when switching between power frequency conversion and frequency conversion. The road cabinet uses the auxiliary contact of the isolated knife switch to lock the operation circuit, and accidents of personnel misoperation often occur due to poor quality of the auxiliary contact and unreasonable design of the locking logic.

[0003] At present, the mainstream inverter bypass cabinet uses the auxiliary contact of the isolated switch to block the operation circuit. The blocking principle is that when the switch on one side is in the frequency conversion position, the switch on the other switch is blocked, but when the motors on both sides are running at the power frequency , can not play the locking function, and when the quality of the auxiliary contact is not good, the locking logic design is unreasonable, and the personnel do not operate according to the operation process, it may cause personnel misoperation accidents

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