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The Stable Operation Method of Primary Fan Frequency Conversion Switching to Power Frequency

An operation method and a stable operation technology, applied in the electrical field, can solve problems such as tripping, power frequency closing and overcurrent, and achieve the effects of avoiding tripping failure, preventing tripping accidents, and increasing reliability

Active Publication Date: 2019-08-16
新疆知信科技有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

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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  • The Stable Operation Method of Primary Fan Frequency Conversion Switching to Power Frequency
  • The Stable Operation Method of Primary Fan Frequency Conversion Switching to Power Frequency
  • The Stable Operation Method of Primary Fan Frequency Conversion Switching to Power Frequency

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Embodiment Construction

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

[0043]figure 1 The 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, inverter output side switch QF2 and bypass power frequency switch QF3, and completing the cable laying, let the 6kV AC bus pass through the power distribution room 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 workers. The c...

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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 the frequency is converted to power frequency. Background technique [0002] Motor frequency conversion energy-saving technology is an important energy-saving measure promoted by the National Energy Administration. With the severe overcapacity of the power grid, peak shaving of units has become inevitable. However, the phenomenon of long-term low-load operation is difficult to improve in the short term, resulting in the low-load operation of auxiliary machines deviated from the economic zone, and the power consumption rate of the plant remains high. [0003] With the rapid development of power electronics technology, computer and automatic control technology, it has become a development trend that AC speed regulation replaces DC speed regulation, and computer digital control technology replaces analog control technology. A ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
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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