CN-115705968-B - Arc analysis method and arc analysis apparatus for contactor

CN115705968BCN 115705968 BCN115705968 BCN 115705968BCN-115705968-B

Abstract

The present disclosure provides an arc analysis method and an arc analysis apparatus for a contactor, the arc analysis method including performing attraction and separation of a moving contact and a fixed contact, performing an acquisition operation including acquiring voltage data and current data of a main loop of the contactor during a predetermined number of times of attraction and separation of the moving contact and the fixed contact, performing an arc analysis operation including determining voltage data and current data of an arc generated corresponding to each separation of the moving contact and the fixed contact among the acquired voltage data and current data, determining each arc characteristic value of the contactor corresponding to each separation based on the voltage data and current data of the arc generated corresponding to each separation of the moving contact and the fixed contact, and determining the arc characteristic value of the contactor based on the determined each arc characteristic value corresponding to each separation.

Inventors

FU KAILIANG
WANG YUANZHONG
JIN CHEN

Assignees

施耐德电器工业公司

Dates

Publication Date: 20260505
Application Date: 20210816

Claims (10)

1. An arc analysis method for a contactor, the contactor comprising a moving contact and a stationary contact, actuation of the moving contact and the stationary contact energizing a main circuit of the contactor, separation of the moving contact and the stationary contact de-energizing the main circuit, and separation of the moving contact and the stationary contact producing an arc, the method comprising: executing the suction and separation of the moving contact and the fixed contact; Performing a collection operation and an arc analysis operation when a total number of times of performing suction and separation of the moving contact and the fixed contact reaches one of a plurality of predetermined total numbers defining different life stages of the contactor; The collecting operation includes collecting voltage data and current data of a main circuit of the contactor during a predetermined collection number of times of the attraction and separation of the moving contact and the fixed contact; The arc analysis operation includes: determining voltage data and current data of an arc generated by each separation of the moving contact and the fixed contact from the collected voltage data and current data; determining respective arc characteristic values of the contactor corresponding to respective separations based on voltage data and current data of an arc generated corresponding to respective separations of the moving contact and the fixed contact, and An arc characteristic value of the contactor is determined based on the determined respective arc characteristic values corresponding to the respective separations.
2. The arc analysis method of claim 1, wherein the arc analysis operation further comprises: And determining that the contactor is abnormal under the condition that at least one arc characteristic value of the determined arc characteristic values of the contactor exceeds a corresponding threshold value.
3. The arc analysis method of claim 1, wherein determining voltage data and current data of the electric arcs generated corresponding to the respective separations of the moving contact and the stationary contact from among the collected voltage data and current data comprises: voltage data and current data over a period of time between a time when the voltage changes from zero to non-zero and a time when the current changes from non-zero to zero for each of the collected voltage data and current data are determined as voltage data and current data corresponding to an arc generated by each separation of the moving contact and the stationary contact.
4. The arc analysis method of claim 3, wherein determining respective arc characteristic values of the contactor corresponding to respective separations based on voltage data and current data of an arc generated corresponding to respective separations of the moving contact and the stationary contact comprises: for each of the voltage data and the current data over a period of time from a time when the voltage changes from zero to non-zero to a time when the current changes from non-zero to zero: determining the duration of the time period as the total time of the electric arcs of the contactor, wherein the total time corresponds to the current separation; determining an integral of the product of the voltage data and the current data over the period of time as an arc total energy of the contactor corresponding to the present separation, and The integral of the square of the current data over the period of time is determined as the total heat of the contactor corresponding to the arc of the current separation.
5. The arc analysis method of claim 4, wherein determining an arc characteristic value of the contactor based on the determined respective arc characteristic values corresponding to each separation comprises: determining an average of the total arc times corresponding to each separation as the total arc time of the contactor; Determining an average of total arc energy corresponding to each separation as total arc energy of the contactor, and The average of the total heat of the arcs corresponding to each separation is determined as the total heat of the arcs of the contactor.
6. An arc analysis apparatus for a contactor, the contactor comprising a moving contact and a stationary contact, actuation of the moving contact and the stationary contact energizing a main circuit of the contactor, separation of the moving contact and the stationary contact de-energizing the main circuit, and separation of the moving contact and the stationary contact producing an arc, the arc analysis apparatus comprising: the driving unit is used for driving the attraction and separation of the moving contact and the fixed contact; an acquisition unit configured to perform an acquisition operation including acquiring voltage data and current data of a main circuit of the contactor during a predetermined number of times of actuation and separation of the moving contact and the stationary contact when the total number of times of actuation and separation of the moving contact and the stationary contact reaches one of a plurality of predetermined total times defining different life stages of the contactor; a processing unit for performing arc analysis operations, the arc analysis operations comprising: determining voltage data and current data of an arc generated by each separation of the moving contact and the fixed contact from the collected voltage data and current data; determining respective arc characteristic values of the contactor corresponding to respective separations based on voltage data and current data of an arc generated corresponding to respective separations of the moving contact and the fixed contact, and An arc characteristic value of the contactor is determined based on the determined respective arc characteristic values corresponding to the respective separations.
7. The arc analysis apparatus of claim 6, wherein the arc analysis operation further comprises: And determining that the contactor is abnormal under the condition that at least one arc characteristic value of the determined arc characteristic values of the contactor exceeds a corresponding threshold value.
8. The arc analyzing apparatus according to claim 7, wherein the processing unit determines each of the acquired voltage data and current data as voltage data and current data corresponding to an arc generated by each separation of the moving contact and the stationary contact over a period of time between a time when the voltage changes from zero to non-zero and a time when the current changes from non-zero to zero.
9. The arc analyzing apparatus according to claim 8, wherein the processing unit performs the following operations for voltage data and current data for each time period from a time when the voltage changes from zero to non-zero to a time when the current changes from non-zero to zero: determining the duration of the time period as the total time of the electric arcs of the contactor, wherein the total time corresponds to the current separation; determining an integral of the product of the voltage data and the current data over the period of time as an arc total energy of the contactor corresponding to the present separation, and The integral of the square of the current data over the period of time is determined as the total heat of the contactor corresponding to the arc of the current separation.
10. The arc analyzing apparatus of claim 9, wherein the processing unit determines an average of total arc times corresponding to each separation as total arc time of the contactor, determines an average of total arc energy corresponding to each separation as total arc energy of the contactor, and determines an average of total arc heat corresponding to each separation as total arc heat energy of the contactor.

Description

Arc analysis method and arc analysis apparatus for contactor Technical Field The present disclosure relates to an arc analysis method and an arc analysis apparatus of a contactor. Background The contactor controls the on-off of a main loop where the contactor is positioned through the attraction and separation between the moving contact and the fixed contact. However, the separation of the moving and stationary contacts typically creates an arc, the high temperature of which may burn the contacts and make the circuit poorly contacted over time. In certain situations, such as those sensitive to electrical sparks, an arc may even cause explosions, personal injuries, and the like. Thus, analysis of the arc is beneficial to the design of the contactor. Disclosure of Invention In view of this, an object of an embodiment of the present disclosure is to provide an arc analysis method and an arc analysis apparatus for a contactor, which acquire an arc characteristic value of the contactor by collecting voltage data and current data of a main circuit of the contactor. An aspect of the present disclosure provides an arc analysis method for a contactor including a moving contact and a stationary contact, actuation of the moving contact and the stationary contact energizes a main loop of the contactor, separation of the moving contact and the stationary contact de-energizes the main loop, and separation of the moving contact and the stationary contact generates an arc, the method including performing actuation and separation of the moving contact and the stationary contact, performing an acquisition operation including acquiring voltage data and current data of the main loop of the contactor during a predetermined number of times of actuation and separation of the moving contact and the stationary contact, performing an arc analysis operation including determining voltage data and current data of an arc generated corresponding to each separation of the moving contact and the stationary contact among the acquired voltage data and current data, determining respective arc characteristic values of the contactor corresponding to each separation based on the voltage data and the current data of the arc generated corresponding to each separation of the moving contact and the stationary contact, and determining the arc characteristic values of the contactor based on the determined respective arc characteristic values corresponding to each separation. Optionally, the arc analysis operation further comprises determining that an abnormality exists in the contactor if at least one of the determined arc characteristic values of the contactor exceeds a corresponding threshold value. Optionally, the arc analysis method further comprises performing a collection operation and an arc analysis operation each time the total number of times of performing the attraction and separation of the moving contact and the fixed contact reaches one of a plurality of predetermined total numbers. Optionally, determining the voltage data and the current data of the electric arcs generated by the respective separations of the moving contact and the fixed contact from the collected voltage data and the current data comprises determining the voltage data and the current data of each of the collected voltage data and the current data over a period from the moment when the voltage changes from zero to non-zero to the moment when the current changes from non-zero to zero as the voltage data and the current data of the electric arcs generated by the respective separations of the moving contact and the fixed contact. Optionally, determining the respective arc characteristic values of the contactor corresponding to the respective separations based on the voltage data and the current data of the arc generated by the respective separations of the moving contact and the fixed contact comprises determining, for each of the voltage data and the current data over a time period from a time point when the voltage changes from zero to non-zero to a time point when the current changes from non-zero to zero, a duration of the time period as an arc total time of the contactor corresponding to the present separation, an integral of a product of the voltage data and the current data over the time period as an arc total energy of the contactor corresponding to the present separation, and an integral of a square of the current data over the time period as an arc total heat of the contactor corresponding to the present separation. Optionally, determining the arc characteristic value of the contactor based on the determined arc characteristic values corresponding to the separations comprises determining an average of the total arc time corresponding to the separations as the total arc time of the contactor, determining an average of the total arc energy corresponding to the separations as the total arc energy of the contactor, and determining an average of the total arc heat cor