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On-line Monitoring Method of Turn Insulation State of Inverter Driven Motor

A technology for driving motors and turn insulation, which is applied in the field of safety monitoring, can solve the problems of reducing the sensitivity and effectiveness of the method, and the weak diagnostic ability of the slight state change of the motor insulation, etc., and achieves the effect of strong anti-interference ability, high sensitivity and simple operation

Active Publication Date: 2021-08-24
SHANGHAI UNIVERSITY OF ELECTRIC POWER
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Problems solved by technology

Although this detection method can realize insulation on-line monitoring, when extracting characteristic indicators, the model parameter estimation will reduce the sensitivity and effectiveness of the method, resulting in weak diagnostic ability for slight state changes of motor insulation.

Method used

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  • On-line Monitoring Method of Turn Insulation State of Inverter Driven Motor
  • On-line Monitoring Method of Turn Insulation State of Inverter Driven Motor
  • On-line Monitoring Method of Turn Insulation State of Inverter Driven Motor

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Embodiment Construction

[0030] An on-line monitoring method for the turn insulation state of an inverter-driven motor. The inverter power device switching output transient terminal voltage is used as a high-frequency excitation, and the motor oscillating current during the switching transient is a transient response. Transient frequency response curve, and use the high-frequency sensitive characteristic component to realize on-line monitoring of turn insulation state.

[0031] An on-line monitoring method for turn insulation state of an inverter-driven motor, comprising the following steps, such as: figure 1 shown:

[0032] 1) First, use the high-frequency voltage sensor and the high-frequency current sensor to collect the inverter output voltage V ce and motor current I G .

[0033] 2) Then, the opposite terminal voltage V ce Edge detection is performed to determine whether it is the switching state of the power device.

[0034] 3) If the detection is not a switching transient process, go back ...

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Abstract

The invention relates to an online monitoring method for the turn insulation state of an inverter-driven motor. The transient terminal voltage output by the switch of the inverter power device is used as the high-frequency excitation, and the oscillation current of the motor during the switch transient is the transient response. By obtaining The frequency response curve of the motor winding in the switching transient, and the high-frequency sensitive characteristic component is used to realize the on-line monitoring of the turn insulation state. When the inverter is working normally, the switching times of the power devices are frequent, which will stimulate a large number of switching oscillation signals, so as to realize the continuous online monitoring of the insulation state of the motor turns; the high-frequency voltage sensor and the high-frequency current sensor detect and obtain the switching signal in real time and switch transient oscillating current, which makes the detection method easy to operate, and can quickly monitor the state change of the turn insulation; the high-frequency sensitive characteristic component is used as an indicator to identify the deterioration of the turn insulation state of the motor, so that the inventive method not only has strong anti-interference ability, And has high sensitivity.

Description

technical field [0001] The invention relates to a safety monitoring technology, in particular to an on-line monitoring method for the turn insulation state of an inverter-driven motor. Background technique [0002] Compared with conventional power frequency motors, inverter-driven motors using pulse width modulation technology have significant advantages such as energy saving, easy start-up, high efficiency and good speed regulation, and are widely used in new energy vehicles, rail transit, wind power generation, variable frequency modulation speed, ship propulsion and other fields. [0003] When the inverter is working normally, the rapid turn-on and turn-off of the power switch tube will generate periodic high dv / dt impulse voltage to increase the electrical stress of the insulating material, and the high-frequency voltage and current harmonics during operation will generate additional heat loss. The above factors make the turn insulation one of the weakest links in the ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01R31/12G01R31/34
CPCG01R31/1227G01R31/34
Inventor 李豪赵孟向大为严浩
Owner SHANGHAI UNIVERSITY OF ELECTRIC POWER
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