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Injection period adaptive strategy-based insulation resistance detection device and method

A technology for insulation resistance and detection devices, which is applied in the field of insulation resistance detection devices based on injection cycle self-adaptive strategies, can solve problems such as inaccurate detection results, influence, detection, etc., to overcome inaccurate detection results, avoid false detections, high precision effect

Active Publication Date: 2017-08-18
BEIJING INST OF SPACE LAUNCH TECH +1
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  • Abstract
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  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In order to solve the problems that the existing insulation resistance detection method is easily affected by the ground capacitance or cannot be detected under the condition that the positive and negative insulation of the DC system is equally reduced, the present invention provides an insulation resistance based on the injection cycle self-adaptive strategy. The detection device and method can effectively avoid the influence of the ground capacitance on the insulation resistance detection, and can effectively detect the insulation resistance under the condition that the insulation of the positive and negative poles of the DC system is equally reduced
[0007] The invention innovates to realize the detection of insulation resistance by injecting signals into the detection loop through the signal injection circuit and detecting the voltage of the sampling resistance. The problem that the bridge balance detection method of insulation resistance does not work effectively overcomes the problem of inaccurate detection results caused by the low-frequency detection method due to the distributed capacitance to the ground

Method used

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  • Injection period adaptive strategy-based insulation resistance detection device and method
  • Injection period adaptive strategy-based insulation resistance detection device and method
  • Injection period adaptive strategy-based insulation resistance detection device and method

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Embodiment 1

[0051] Such as Figures 1 to 4 As shown, this embodiment firstly provides an insulation resistance detection device based on an injection period adaptive strategy. Such as figure 1 As shown, the left frame represents the high-voltage DC system, insulation resistance, and chassis of the locomotive. The DC voltage is generally 500VDC to 700VDC. The insulation resistance involved in the present invention is the insulation resistance between the locomotive chassis and the locomotive power supply system; the right diagram The frame is the part of the insulation resistance detection circuit connected by the present invention.

[0052] Specifically, as figure 1 , 2 As shown, the detection device includes a first resistor R1, a second resistor R2, a third resistor R3, a fourth resistor R4, a sampling resistor Rm, a signal injection circuit, a voltage signal acquisition circuit and a microcontroller, the first resistor R1 and the second resistor The second resistor R2 is sequential...

Embodiment 2

[0076] Such as figure 1 , 2 , 3, and 5, this embodiment is basically the same as Embodiment 1, the difference is that the insulation resistance detection method is further improved, not only to judge that the voltage change rate is less than the voltage change rate limit value α, but also to judge how much A continuous voltage change rate is less than α, to avoid accidents causing the voltage change rate to be less than the voltage change rate limit value, thereby improving the accuracy of judging whether the capacitance to ground is fully charged.

[0077] In step 3, after judging that the first sampling voltage change rate |ΔUm1| Exceeding the first preset number, if yes, record the sampling voltage U_f1 at this time, and execute step 5; if not, execute step 4; in this embodiment, the first preset number is 10.

[0078] In step 7, after judging that the second sampling voltage change rate |ΔUm2| Exceeding the second preset number, if yes, record the sampling voltage U_f3 ...

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Abstract

The present invention discloses an injection period adaptive strategy-based insulation resistance detection device and a method. The insulation resistance exists between a locomotive chassis and a locomotive power supply system. The detection device comprises a first resistor, a second resistor, a third resistor, a fourth resistor, a sampling resistor, a signal injection circuit, a voltage signal acquisition circuit and a microcontroller. The voltage signal acquisition circuit is used for acquiring the voltage shared by the sampling resistor. The microcontroller is used for calculating the value of the insulation resistance. The detection method is provided for automatically adjusting the insulation resistance of an injection period. For the complex and changeable circuit structure of a high-voltage system, the injection period of a signal is automatically adjusted, so that the influence of the ground capacitance on the detection of the insulation resistance is eliminated. The real-time detection accuracy of the insulation resistance is improved. Meanwhile, the insulation resistance is effectively detected under the condition that the insulation of the positive electrode and the insulation of the negative electrode of the DC system are equivalently decreased.

Description

technical field [0001] The present invention relates to the technical field of insulation resistance detection, and more specifically, the present invention is an insulation resistance detection device and method based on an injection period adaptive strategy. Background technique [0002] The application of high-voltage power supply and distribution systems in model tasks is gradually increasing, especially the energy supply systems represented by military all-electric drives, which usually include high-voltage battery packs, high-voltage distribution boxes, generator sets, high-voltage chargers, and high-voltage power converters And other equipment, its bus voltage can usually reach 500VDC to 700VDC, or even higher. The above-mentioned equipments all involve high-voltage electrical insulation problems, and changes in working conditions, vibration, temperature and humidity may cause rapid aging of power cables and other insulating materials or even damage to the insulation,...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R27/02
CPCG01R27/025
Inventor 赵志刚骆志伟李均锋张春雷吴春燕鞠兴龙何刚杨松璞董星言
Owner BEIJING INST OF SPACE LAUNCH TECH
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