Stable operation method used during primary fan frequency-conversion power frequency switching

An operation method and technology of stable operation, applied in the electrical field, can solve problems such as power frequency closing overcurrent, tripping, etc., to prevent tripping accidents, avoid tripping failures, and increase reliability.

Active Publication Date: 2018-07-10
新疆知信科技有限公司
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  • Abstract
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  • Claims
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Problems solved by technology

[0006] However, in the prior art, when the frequency converter fails or switches to the power frequency bypass normally, due to the residual voltage in the high-voltage motor in the primary fan, it will cause overcurrent when the power frequency is switched on and cause a trip.

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  • Stable operation method used during primary fan frequency-conversion power frequency switching
  • Stable operation method used during primary fan frequency-conversion power frequency switching
  • Stable operation method used during primary fan frequency-conversion power frequency switching

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Embodiment Construction

[0042] In order to make those skilled in the art better understand the technical solutions of the present invention, the present invention will be described in further detail below with reference to the accompanying drawings and embodiments.

[0043]figure 1 A schematic diagram of the main wiring of the primary fan provided by the embodiment of the present invention, such as figure 1 As shown, after installing the inverter input side switch QF1, the inverter output side switch QF2 and the bypass power frequency switch QF3, and completing the laying of the primary cable, make the 6kV AC bus pass through the power frequency switch QF, The inverter input side switch QF1 is connected to the input end of the inverter VFD, the output end of the inverter VFD is connected to the motor of the primary fan through the inverter output side switch QF2, and the two ends of the bypass power frequency switch QF3 are respectively connected to the power distribution room. The connection point o...

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Abstract

The invention provides a stable operation method used during primary fan frequency-conversion power frequency switching. According to the technical scheme, an alternating current bus sequentially passes through a distribution room power frequency switch (QF) and a frequency converter input side switch (QF1) to be connected with the input end of a frequency converter, the output end of the frequency converter is connected with a motor of a primary fan through a frequency converter output side switch (QF2), the two ends of a bypass power frequency switch (QF3) are connected with a connection point of the distribution room power frequency switch (QF) and the frequency converter input side switch (QF1) and the motor of the primary fan correspondingly. The operation method comprises the steps that when the frequency converter operates normally and when the power frequency is judged to be cut according to the operation condition of the primary fan, or when the frequency converter breaks down, and sequentially, the frequency converter output side switch (QF2) is switched off, the bypass power frequency switch (QF3) is switched on and the frequency converter input side switch (QF1) is switched off, so that the primary fan is switched into a power frequency operation state. According to the method, when the frequency converter breaks down or is normally switched to a power frequency bypass, the situation of tripping caused by the fact that over-current occurs is avoided.

Description

technical field [0001] The invention relates to the field of electrical technology, in particular to a method for stable operation of a primary fan when frequency conversion and power frequency are cut. Background technique [0002] Motor frequency conversion energy-saving technology is an important energy-saving measure promoted by the National Energy Administration. With the serious overcapacity of the power grid, the peak shaving of units is inevitable. However, the long-term low-load operation phenomenon is difficult to improve in the short term, which leads to the deviation of the low-load operation conditions of auxiliary units from the economic zone, and the power consumption rate of the plant remains high. [0003] With the rapid development of power electronic technology, computer and automatic control technology, AC speed regulation has replaced DC speed regulation, and computer digital control technology has replaced analog control technology. a major means of te...

Claims

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Application Information

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IPC IPC(8): F04D27/00
CPCF04D27/00
Inventor 马贞张俊彪吕弘业吴小东许文
Owner 新疆知信科技有限公司
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