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Breaker overtravel detecting method

A detection method and circuit breaker technology, applied in the direction of instruments, measuring devices, electrical devices, etc., can solve the problems of cumbersome errors, large artificial measurement errors of measurement methods, and high risk of circuit breaker casings, so as to ensure safety. Effect

Inactive Publication Date: 2014-12-24
ANHUI XINLONG ELECTRICAL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Obviously, the above-mentioned lighting method is very cumbersome to implement and has a large error. The artificial measurement error of the measurement method is large, and it is necessary to open the circuit breaker case when the switch is closed, which is very dangerous.

Method used

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Embodiment Construction

[0023] In the present invention, the displacement sensor is installed on the insulated pull rod of the circuit breaker in a threaded manner, and its front end is level with the contact spring, so that it has the same compression stroke as the contact spring when closing. When the switch is closed, one end of the output resistance is compressed, and the working voltage V12 is applied to both ends of the output voltage, and the output voltage value can be detected. The voltage value has a linear relationship with the compression stroke. The overtravel can be detected by detecting the voltage value. size. The maximum moving distance of the displacement sensor is set at 10mm, and the internal resistance is 5kΩ.

[0024] Such as figure 1 As shown, POS_A is the output terminal of the sensor. The voltage input to the op amp after being divided by resistor R165 and resistor R166 is 0.5POS_A. After passing through the voltage follower and divided by resistor R167 and resistor R168, the ou...

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Abstract

The invention discloses a breaker overtravel detecting method. The detecting method is characterized in that a displacement sensor is mounted on a breaker insulation pull rod in a threaded manner, the front end of the displacement sensor is level with a contact spring. During switching on, the output resistor in the displacement sensor is compressed to access working voltage V12, and breaker overtravel is calculated after output voltage is detected. By the method, real-time and accurate detection of overtravel is achieved, a user can visually see the overtravel and master the performance of a breaker at any time, and safety and reliability of breaker operation are guaranteed.

Description

Technical field [0001] The invention relates to the field of production detection of smart circuit breakers, and in particular to a detection method of circuit breaker overtravel. Background technique [0002] In a vacuum circuit breaker, when the circuit breaker is closed, the static and dynamic contacts will continue to move a certain distance, which is called overtravel. This stroke is to ensure contact pressure, improve the reliability of closing and reduce contact wear, and is generally provided by a contact spring connected to an insulating pull rod. If the overtravel is too small, the contact pressure that the contact should have after burning cannot be guaranteed. At the same time, the initial opening speed will be reduced, which will affect the breaking and dynamic thermal stability of the circuit breaker, and even produce reclosing bounce; Too much travel will increase the closing power of the operating mechanism and make the closing extremely unreliable. Therefore, th...

Claims

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Application Information

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IPC IPC(8): G01B7/02
Inventor 束龙胜刘超刘建陶路路
Owner ANHUI XINLONG ELECTRICAL
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