High-voltage solid-state soft start all-in-one machine without power compensation

Abstract

The invention relates to a high-voltage solid-state soft start all-in-one machine without power compensation, and belongs to the technical field of solid-state soft start of high-voltage motors. According to the technical scheme, a high-voltage circuit is composed of a high-voltage thyristor assembly, a valve body protection unit, a vacuum switch part and the like; a control system is composed of a thyristor trigger unit and a signal acquisition and protection component, and the trigger system connects low-voltage control to a high-voltage part through an optical fiber, so that reliable isolation between the high-voltage part and the low-voltage part is achieved; and the system control and display interface forms a man-machine interaction unit. The high-voltage soft starting device has the beneficial effects that the high-voltage soft starting device can smoothly accelerate according to set starting parameters, so that electrical and mechanical impact on a power grid, a motor and equipment is reduced, after the motor reaches a rated rotating speed, the bypass contactor is automatically switched on, and after the high-voltage soft starting device is started, the motor continues to be monitored, and various fault protections are provided. The transformer can be used for soft start of a high-capacity transformer, impact on a power grid is reduced, inrush current is reduced in new main transformer input, and the transformer is multipurpose.

Description

technical field [0001] The invention relates to a high-voltage solid-state soft-start integrated machine without power compensation, and belongs to the technical field of high-voltage motor solid-state soft-start. Background technique [0002] The high-voltage high-power motor will cause impact on the power grid during the start-up process and affect the normal operation of other equipment. The start-up of the high-voltage large-capacity motor will cause voltage fluctuations, equipment undervoltage operation, and affect production; the impact on the motor will cause aging or even damage to components. Shorten the service life of the motor; the impact on the coupling of mechanical transmission components, the belt of the gearbox and the driven load is large, resulting in a shortened service life of these components. In the prior art, the motor soft start is to realize the smooth start of the motor and mechanical load by adopting technical means such as voltage reduction, comp...

AI Technical Summary

Problems solved by technology

Today's industrial grid voltage is mostly three-phase AC 6kV, 10kV, 35kV. A single thyristor with DC 6500V cannot be directly applied to a high-voltage system, and series technology must be used, which brings a series of problems, as follows: (1) On the thyristor The unbalanced voltage of the thyristor can easily cause overvoltage and damage to the thyristor; (2) voltage harmonics can easily cause instantaneous overvoltage and damage to the thyristor; (3) the asynchronous opening and closing of the thyristor can easily cause the thyristor to be damaged due to overvoltage

In addition, the high-voltage solid-state soft-start device in the prior art has single function and imperfect protection

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