A main protection configuration circuit and configuration method for a large air-cooled camera

Abstract

The invention discloses a main protection configuration circuit of a large air-cooled adjuster, comprising a branch current transformer arranged at a first branch of A phase, B phase and C phase and acurrent transformer arranged at a camera end of the adjuster A, a camera end of the adjuster B and a camera end of the adjuster C, wherein the branch current transformer and the current transformer constitute an incomplete longitudinal difference protection; The lead-out terminals of the first branch of the A phase, the B phase and the C phase are connected to form a neutral point O1; The lead-out terminals of the second branch of the A phase, the B phase, and the C phase and the third branch of the A phase, the B phase, and the C phase are connected to form a neutral point O2, a neutral point O1, and a neutral point O2. A method for configure that main protection of a large air-cooled regulator is also disclosed. By changing the combination mode of the lead bars of each phase and each branch of the adjuster to form a new neutral point side lead terminal, the end fault type including the same direction and different branch turns short circuit is protected, because the number of the lead terminals of the neutral point side of the large air-cooled adjuster is not changed, the difficulty of designing and manufacturing the motor is reduced.

Description

technical field [0001] The invention relates to the design and manufacture of large-scale air-conditioning cameras and the technical field of relay protection for main equipment in power systems, in particular to a main protection configuration circuit and configuration method for large-scale air-cooling air-conditioning cameras. Background technique [0002] The internal fault of the stator winding of a large turbogenerator is a common and highly destructive fault of the motor. When the internal fault occurs, a large short-circuit current will generate a destructive and serious electromagnetic force, and may also cause overheating, burning the winding and the iron core. The negative sequence magnetic field generated by the fault may greatly exceed the design allowable value, causing serious damage to the rotor. Therefore, my country's relay protection technical regulations clearly stipulate that large turbogenerators need to be equipped with phase-to-phase and inter-turn sh...

AI Technical Summary

Problems solved by technology

However, for the design and manufacture of large turbogenerators, even if only one lead-out terminal is added, or the simplest zero-sequence current type transverse difference protection is added, major changes must be made in the outgoing line structure, such as Figure 4 and Figure 5 shown so that figure 2 and image 3 The technical transformation shown is very difficult to implement

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