Control device and method for preventing voltage fluctuation and tripping of electric network of heating medium circulating pump

Abstract

The invention provides a control device for preventing voltage fluctuation and tripping of an electric network of a heating medium circulating pump. The control device comprises a shielded electric pump and an electrical control cabinet, wherein the shielded electric pump comprises a motor and a pump which are integrated and is arranged in a heating medium pipeline, the electrical control cabinet is arranged in a control chamber of a heating medium station, and the shielded electric pump is connected with the electrical control cabinet through a cable; and the device also comprises a current detection device and a delay protection device which are arranged in a control cabinet of the heating medium circulating pump. No tripping in operation of the heating medium circulating pump can be ensured when the voltage of the electric network decreases as a result of thunder, lightning and other factors, and the stable operation in production can be guaranteed.

Description

technical field [0001] The invention relates to a control device and method for a heating system, and in particular to a control device and method for a heat medium circulating pump to prevent tripping of a grid voltage fluctuation. Background technique [0002] The heat medium circulation pump is one of the key equipment of the heat medium heating system. It consists of a shielded electric pump and an electrical control cabinet. The shielded electric pump is an integrated structure of the motor and the pump. It is installed in the heat medium pipeline and the electrical control cabinet is installed In the control room of the heat medium station, they are connected by cables, and the operation control and monitoring of the circulating pump are realized in the control cabinet. [0003] Figure 1A and Figure 1B The power supply wiring diagram and the control principle diagram of the existing heat medium circulation pump are respectively shown. exist Figure 1A Among them, Q...

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Problems solved by technology

[0005] The large current protection function during normal operation is realized through the FAULT output terminal of the soft starter and the intermediate relay K0. Because the FAULT output contact of the soft starter has no delay function, when the grid voltage drops for some reason, the motor operating current increases greatly. It is easy to cause the high current protection action of the soft starter to trip and stop

[0006] During production and operation, there are often thunderstorms or other reasons that cause voltage fluctuations in the company’s power grid, causing the high-current protection of the heat medium circulating pump to trip and stop, which in turn causes the interlocking shutdown of the heat medium furnace, and the temperature of the heat medium heating system drops. The production of silk and polyester is greatly affected. In severe cases, all polyester and spinning products will be downgraded, resulting in huge production losses.

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