Device for separate delay starting of induced draft fans

Abstract

The invention relates to a device for separate delay starting of induced draft fans. The device comprises a plurality of induced draft fans and a induced draft fans control cabinet on a transmission side, and is characterized in that a master push-button is arranged inside the induced draft fans control cabinet on the transmission side, wherein the master push-button is connected with starting switches of the plurality of induced draft fans; and a time delay is arranged on the starting switch of each induced draft fans. The device for separate delay starting of induced draft fans is added with the time relays on the starting devices for the induced draft fans; the time delay is used to achieve the dela starting or shutdown in the whole starting process, so that the influences to power grid voltage when a plurality of devices are simultaneously started are reduced to protect the voltage of the power grid. The device for separate delay starting of induced draft fans is simple to install, and small in investment cost.

Description

technical field [0001] The present invention belongs to the technical field of papermaking machinery, and in particular relates to a protection device for transient fluctuations in grid voltage caused by the simultaneous start-up or shutdown of multiple high-power electrical equipment—a delay start-up device for wind turbine divisions. Background technique [0002] In the papermaking industry, many high-power electrical equipment are involved. If they start or stop at the same time, they will cause instantaneous fluctuations in the grid voltage and cause damage to the electrical switches. Taking the drying section of the paper machine in the papermaking workshop as an example, the fan control cabinet is on the transmission side. (Stop) requires the operator to go to the operating side to shut down one by one, and the interval time cannot be uniform. When the paper machine is running normally, one to six groups of drying cylinder fans start to work at the same time. The motor ...

AI Technical Summary

Problems solved by technology

[0002] In the papermaking industry, many high-power electrical equipment are involved. When they start or stop at the same time, they will cause instantaneous fluctuations in the grid voltage and cause damage to the electrical switches. Taking the drying section of the paper machine in the papermaking workshop as an example, the fan control cabinet is on the transmission side. (Stop) requires the operator to go to the operating side to shut down one by one, and the interval time cannot be uniform. When the paper machine is running normally, one to six groups of drying cylinder fans start to work at the same time. The motor used for each is four-stage 15KW, rated current 30A, When a paper break occurs, the 7 fans need to stop operating at the same time. During the entire operation process, the current of the three-phase asynchronous cage or the motor is 5-7 times higher than that of the 7 15KW wind blowers for a single paper machine. The minimum 5 times The starting current will reach 1050A in an instant, which will cause instantaneous fluctuations in the grid voltage, often causing overvoltage tripping of the main drive inverter, and fluctuations in the DCS system, which will have a certain impact on production

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