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Method and system for online monitoring of low-voltage electrical appliances

A technology of low-voltage electrical appliances and coils, applied in the field of online monitoring of low-voltage electrical appliances, can solve problems such as reduced operating current, manual inspection, and misjudgment of tripping events, and achieve the effect of reducing impact and improving implementability

Active Publication Date: 2022-07-12
CHENGDU YUNDA TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, when the operating current of the circuit breaker changes due to some specific load changes, the operating current of the circuit breaker also instantly drops from the normal operating current value to zero, resulting in misjudgment and false reporting of tripping events, causing many unnecessary manual inspection work

Method used

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  • Method and system for online monitoring of low-voltage electrical appliances
  • Method and system for online monitoring of low-voltage electrical appliances
  • Method and system for online monitoring of low-voltage electrical appliances

Examples

Experimental program
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Effect test

Embodiment 1

[0071] This embodiment provides an online monitoring method for low-voltage electrical appliances. The on-line monitoring method is used to monitor the low-voltage electrical appliances installed in the vehicle system. The low-voltage electrical appliances include a first low-voltage electrical appliance and a second low-voltage electrical appliance. The first low-voltage electrical appliance includes at least one of a contactor and a relay. The second low-voltage electrical appliance includes a circuit breaker. The on-line monitoring method for low-voltage electrical appliances includes at least one of a first on-line monitoring method for low-voltage electrical appliances and an on-line monitoring method for circuit breakers.

[0072] like figure 1 As shown, the first low-voltage electrical appliance online monitoring method includes:

[0073] S01. Select a time period during which the first low-voltage electrical appliance is turned on.

[0074] S02, applying an AC exc...

Embodiment 2

[0102] This embodiment provides an online monitoring system for low-voltage electrical appliances based on the method for online monitoring of low-voltage electrical appliances in Embodiment 1. like image 3 As shown, the system includes a power supply board, a first low-voltage electrical appliance collection board, a circuit breaker collection module and a main control board. The power supply board, the first low-voltage electrical appliance collection board, the circuit breaker collection module and the main control board are all located at the vehicle end of the vehicle.

[0103] Power supply board: used to supply power to the main control board, the first low-voltage electrical appliance collection board and the circuit breaker collection module.

[0104] The first low-voltage electrical appliance acquisition board includes: a first data acquisition unit, a second data acquisition unit, a third data acquisition unit, a fourth data acquisition unit and a first MCU control...

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Abstract

The invention discloses an on-line monitoring method and system for low-voltage electrical appliances. The on-line monitoring method for low-voltage electrical appliances comprises: S01, selecting a time period; S02, applying an AC excitation source at both ends of a contact; S03, acquiring contact resistance state data; S04 , disconnecting the connection between the two ends of the contact and the AC excitation source; S05, digitally filtering the contact resistance state data; S06, calculating the contact resistance value; S07, judging whether the contact resistance value is within the first preset range; If yes, go to S11; if no, go to S08; S08, repeat S02 to S06 to obtain M groups of contact resistance values; S09, calculate the mean square error of each group of contact resistance values; S10, select the mean square error Calculate the average value of a group of contact resistance values ​​whose value is closest to 0; S11, determine the operating state of the first low-voltage electrical appliance according to the contact resistance values ​​within the first preset range or the average value in S10.

Description

technical field [0001] The invention belongs to the technical field of low-voltage electrical appliances, and in particular relates to an on-line monitoring method and system for low-voltage electrical appliances. Background technique [0002] In the vehicle system of the subway and other means of transportation, in order to meet the needs of the continuous development of vehicle intelligence, informatization, and intelligent operation and maintenance, low-voltage electrical appliances have become one of the indispensable components in the vehicle system. At present, the common low-voltage electrical appliances in the vehicle system include contactors, relays and circuit breakers. The normal use of low-voltage electrical appliances is of great significance to the realization, control and protection of various key functional circuits related to the vehicle system. The quality and reliability put forward higher requirements. However, various failures will occur in low-voltage...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01R31/327G01R31/00
CPCG01R31/3277G01R31/3278G01R31/008
Inventor 杨楠李夫忠杨文飞夏飞远唐彬苟心海张琳婧周翔宇李泓钰冯远翔赵谋方文龙刘强胡俊丞商畯皓严春宏谯波黄涛
Owner CHENGDU YUNDA TECH CO LTD