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Detection device and method for insulation resistance of double-winding motor

A technology of insulation resistance and double winding, which is applied in measuring devices, measuring resistance/reactance/impedance, measuring electrical variables, etc., can solve the problem of inconvenient detection of insulation resistance of motors, and achieve the effect of intelligent and normalized detection

Active Publication Date: 2015-01-21
BEIJING ETECHWIN ELECTRIC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Since wind turbines are generally placed in the nacelle of the fan above 60m above the ground, maintenance personnel are usually required to carry an insulation resistance tester through the tower to the nacelle to test the insulation resistance of the motor, so the insulation resistance of the motor is tested manually extremely inconvenient

Method used

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  • Detection device and method for insulation resistance of double-winding motor
  • Detection device and method for insulation resistance of double-winding motor
  • Detection device and method for insulation resistance of double-winding motor

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Embodiment 1

[0032]When measuring the insulation resistance, because the three-phase windings are symmetrical, the winding on any one phase can be selected when measuring the insulation resistance, and the winding on any one of a set of three-phase windings in the double-winding motor can be used as the first winding. The winding of the corresponding phase in another set of three-phase windings is used as the second winding.

[0033] image 3 The structural diagram of the insulation resistance detection device of the double-winding motor provided by the embodiment of the present invention; image 3 As shown, the insulation resistance detection device of the double-winding motor in the embodiment of the present invention includes:

[0034] The control unit 100 is configured to control the converter to apply the DC bus voltage in the same direction and the DC bus voltage in the opposite direction to the first winding and the second winding.

[0035] Wherein, applying the DC bus voltage in ...

Embodiment 2

[0040] Figure 4 The second structural diagram of the insulation resistance detection device for the double-winding motor provided by the embodiment of the present invention; Figure 5 It is a circuit structure model diagram of an equivalent insulation resistance detection system of a double-winding motor according to Embodiment 2 of the present invention, wherein, Figure 5 The voltage and current detection unit in the detection device of this embodiment is described in more detail with the detection circuit of any phase winding, and the corresponding parts are denoted by the same reference numerals. exist Figure 5 in, R g1 , R g2 are the equivalent resistances of the positive DC bus and the negative DC bus of the converter to ground respectively, R 0 is the equivalent resistance of the generator casing PE to the system grounding point (the grounding points mentioned below are the generator casing PE). In an embodiment of the present invention, R g1 , R g2 , R 0 It d...

Embodiment 3

[0065] Figure 6 It is one of the flow diagrams of the detection method of the insulation resistance of the double-winding motor in the embodiment of the present invention, wherein the winding on any one phase of a group of three-phase windings in the double-winding motor is used as the first winding, and another group of three-phase windings is used as the first winding. The winding of the corresponding phase in the phase winding is used as the second winding, such as Figure 6 As shown, the steps of the detection method of the insulation resistance of the double-winding motor are:

[0066] Detection step 400: Control the converter to apply the DC bus voltage in the same direction and the DC bus voltage in the opposite direction to the first winding and the second winding, and detect the relative grounding point of the output terminal of the first winding and the output terminal of the second winding voltage and current;

[0067] Insulation resistance calculation step 500: ...

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Abstract

The invention provides a detection device and method for insulation resistance of a double-winding motor. The device comprises a control unit, a voltage and current detecting unit and an insulation resistance calculating unit, wherein the control unit is used for controlling a converter to apply direct-current bus voltage in the same direction and direct-current bus voltage in the reverse direction, the voltage and current detecting unit is used for detecting the voltage and the current of the output end of a first winding and the voltage and the current of the output end of a second winding relative to a grounding point under the state of applying the direct-current bus voltage in the same direction and the direct-current bus voltage in the reverse direction, and the insulation resistance calculating unit is used for calculating the insulation resistance according to the detected voltage and the detected current. The direct-current bus voltage different in direction is applied to the windings by controlling the converter of the double-winding motor, voltage values and current values of measuring circuits under the direct-current bus voltage different in direction are measured, and then the insulation resistance value is calculated. It is avoided that a maintainer manually detects the insulation resistance of the motor by carrying an insulation resistance tester, and the insulation resistance of the motor can be detected intelligently in a normalization mode.

Description

technical field [0001] The invention relates to the technical field of wind power generation, in particular to an insulation resistance detection device and method for a double-winding motor. Background technique [0002] In wind turbines, the cost of generators accounts for a large proportion of the cost of the entire wind turbines. With the increasing number of wind turbines and the increasing running time of power generation, people pay more and more attention to the operation safety of generators, and people The insulation resistance of the generator is also often used as an evaluation index for evaluating the insulation level of the generator. Since wind turbines are generally placed in the nacelle of the fan above 60m above the ground, maintenance personnel are usually required to carry an insulation resistance tester through the tower to the nacelle to test the insulation resistance of the motor, so the insulation resistance of the motor is tested manually Extremely ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R27/08
Inventor 郭锐尹进峰马忠宝
Owner BEIJING ETECHWIN ELECTRIC
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