CN-122000220-A - Selector gear shifting positioning method and system of on-load tap-changer and selector

CN122000220ACN 122000220 ACN122000220 ACN 122000220ACN-122000220-A

Abstract

The application relates to the technical field of electrical equipment control, and discloses a selector gear shifting and positioning method, a selector gear shifting and positioning system and a selector of an on-load tap-changer, wherein the running state of the selector is set according to the corresponding relation between the contact positions of a fixed contact and a movable contact and the voltage change of the movable contact; the method comprises the steps of sending a driving pulse signal to a stepping motor to control the stepping motor to drive a movable contact, obtaining a feedback signal of a pulse encoder of the stepping motor, obtaining a movement distance of the movable contact in each operation state of a selector according to the driving pulse signal and the feedback signal, correcting the movement distance according to a voltage signal obtained by a voltage detection loop to obtain a corrected movement distance, and resetting the accumulated pulse number of the driving pulse signal according to the corrected movement distance to shift and position the selector. According to the method disclosed by the application, the accuracy and reliability of the gear shifting and positioning result of the selector are improved, and the abnormal early warning is realized.

Inventors

ZHOU GUOWEI
WANG XUAN
PENG CHENGUANG
CHEN CHUAN
YAO HUI
ZOU HUI
WEI LINLIN
CHEN XIN
SUN LINTAO
WANG QUANHU
DAI PENGFEI
CHENG XINGMIN

Assignees

国网浙江省电力有限公司超高压分公司

Dates

Publication Date: 20260508
Application Date: 20260410

Claims (9)

1. The utility model provides a selector gear shift positioning method of on-load tap-changer, its characterized in that, the selector includes step motor, stationary contact, movable contact and voltage detection return circuit, voltage detection return circuit with the movable contact is connected, the method includes: setting the operation state of the selector according to the corresponding relation between the contact position of the fixed contact and the movable contact and the voltage change of the movable contact; Sending a driving pulse signal to the stepping motor to control the stepping motor to drive the movable contact, and obtaining a feedback signal of a pulse encoder of the stepping motor, and obtaining a movement distance of the movable contact in the selector reaching each running state according to the driving pulse signal and the feedback signal; correcting the movement distance according to the voltage signal acquired by the voltage detection loop to obtain a corrected movement distance, and resetting the accumulated pulse number of the driving pulse signal according to the corrected movement distance so as to shift and position the selector.
2. The selector gear shift positioning method of on-load tap-changer according to claim 1, wherein the setting the operation state of the selector according to the correspondence between the contact positions of the stationary contact and the movable contact and the voltage change of the movable contact comprises: When the left movable contact of the movable contact and the first odd fixed contact of the fixed contact are positioned at a first preset position and the voltage of the movable contact is continuously stable, the motion state of the selector is a stable operation state; When the left movable contact of the movable contact is about to be separated from the first odd fixed contact of the fixed contact and the voltage of the movable contact is changed from the existence to the non-existence, the operation state of the selector is in a critical state with electricity; When the left movable contact is about to be contacted with a second odd fixed contact of the fixed contact and the voltage of the movable contact changes from no to no, the operation state of the selector is in a non-electric critical state; And when the left movable contact of the movable contact and the second odd fixed contact of the fixed contact are positioned at a second preset position and the voltage of the movable contact is recovered to be stable, the motion state of the selector is the next gear stable operation state.
3. The selector gear shift positioning method of on-load tap-changer according to claim 2, wherein the obtaining the movement distance of the movable contact in the selector to each of the operation states according to the driving pulse signal and the feedback signal includes: Judging whether the first pulse number of the driving pulse signal is consistent with the second pulse number of the feedback signal, if not, carrying out pulse complement on the stepping motor so as to make the first pulse number and the second pulse number equal; after pulse reissuing is completed, judging whether the first pulse number reaches a first preset pulse number, if so, the selector is in the electricity critical state, and obtaining a first movement distance of the movable contact in the selector reaching the electricity critical state according to the first preset pulse number, the step angle of the stepping motor and the pulse frequency of the driving pulse signal; Judging whether the first pulse number reaches a second preset pulse number, if so, the selector is in the non-electric critical state, and obtaining a second movement distance of the movable contact in the non-electric critical state according to the second preset pulse number, the step angle and the pulse frequency; Judging whether the first pulse number reaches a third preset pulse number, if so, the selector is in a next gear stable running state, and obtaining a third movement distance of the movable contact in the selector reaching the non-electric critical state according to the third preset pulse number, the step angle and the pulse frequency.
4. The method for positioning a selector gear shift of an on-load tap changer of claim 3, wherein correcting the movement distance according to the voltage signal obtained by the voltage detection circuit to obtain a corrected movement distance comprises: When the selector is in the electric critical state, judging whether voltage exists between the left movable contact and the right movable contact of the movable contact according to the voltage signal, if so, pulse reissuing is carried out on the stepping motor until no voltage exists between the left movable contact and the right movable contact, so as to correct the first movement distance, and the corrected first movement distance is obtained; And when the selector is in the non-electric critical state, judging whether voltage exists between the left movable contact and the right movable contact according to the voltage signal, if not, pulse reissuing is carried out on the stepping motor until voltage exists between the left movable contact and the right movable contact, so as to correct the second movement distance, and obtaining the corrected second movement distance.
5. The method of selector shift positioning for an on-load tap changer of claim 4, wherein resetting the cumulative pulse number of the drive pulse signal based on the corrected movement distance to shift the selector comprises: Resetting the accumulated pulse number of the driving pulse signal after the movable contact reaches the corrected first movement distance; And resetting the accumulated pulse number of the driving pulse signal after the movable contact reaches the corrected second running distance.
6. The method of selector shift positioning for an on-load tap-changer of claim 4, further comprising: When the selector is in the next gear stable running state, judging whether voltage exists between the left movable contact and the right movable contact according to the voltage signal, and if not, carrying out abnormal operation early warning on the selector; Judging whether the difference value between the third movement distance and the preset distance meets a preset threshold judgment condition, and if not, carrying out gear shifting positioning abnormality early warning.
7. The method of positioning a selector gear shift of an on-load tap changer of claim 6, wherein the corrected first movement distance and the predetermined distance are each 1/6 of the length of the movable contact.
8. A selector gear shifting and positioning system of an on-load tap-changer, for implementing the selector gear shifting and positioning method of the on-load tap-changer according to any one of claims 1 to 7, characterized in that the selector comprises a stepping motor, a fixed contact, a movable contact and a voltage detection loop, the voltage detection loop is connected with the movable contact, the system comprises an operation state determining module, a movement distance acquiring module and a correction reset module; The running state determining module is used for determining the running states of the selectors to obtain a plurality of running states of the selectors, and the running states are set to reflect the corresponding relation between the contact positions of the fixed contact and the movable contact and the voltage change of the movable contact; The motion distance acquisition module is used for sending a driving pulse signal to the stepping motor so as to control the stepping motor to drive the movable contact, acquiring a feedback signal of a pulse encoder of the stepping motor, and acquiring the motion distance of the movable contact in the selector reaching each running state according to the driving pulse signal and the feedback signal; the correction reset module is used for correcting the movement distance according to the voltage signal acquired by the voltage detection loop to obtain a corrected movement distance, and resetting the accumulated pulse number of the driving pulse signal according to the corrected movement distance so as to shift and position the selector.
9. A selector of an on-load tap-changer, which performs gear shifting and positioning by adopting the selector gear shifting and positioning method of the on-load tap-changer according to any one of claims 1 to 7, wherein the selector comprises a stepping motor, a fixed contact, a movable contact and a voltage detection loop, and the voltage detection loop is connected with the movable contact.

Description

Selector gear shifting positioning method and system of on-load tap-changer and selector Technical Field The invention relates to the technical field of electrical equipment control, in particular to a selector gear shifting and positioning method and system of an on-load tap-changer and the selector of the on-load tap-changer. Background In order to cope with voltage fluctuation or load change of a power grid, an on-load tap-changer is generally adopted to adjust the output voltage of a transformer, and the on-load tap-changer can change the turns ratio of a transformer winding under the condition of not interrupting load current, so that the accurate adjustment of the output voltage is realized, and the on-load tap-changer is important equipment for guaranteeing the stable operation of a power system. The selector of the on-load tap-changer is a core execution component for realizing voltage adjustment, and the main function of the selector is to enable the movable contact to be connected with fixed contacts of different taps in the transformer through moving the movable contact, namely, gear switching is completed. After selector gear shifting is finished, the fixed contact needs to be accurately positioned at a proper position of the movable contact, if deviation occurs, poor contact and heating phenomena can be caused, equipment damage is further caused, and even the normal operation of the whole power system is affected when the equipment damage is serious. In the conventional selector gear shifting control method of the on-load tap-changer, gear control is realized by adopting a combined structure of a motor, a gear box and a grooved pulley. Specifically, the gear box is driven by the motor, the gear box drags the grooved wheel to move, and then the movable contact piece of the selector is driven to complete gear shifting action, meanwhile, the gear box drags the gear to drive the code wheel mechanism, and a gear shifting signal is output through the code wheel mechanism, so that the gear shifting position is positioned. However, the conventional gear shifting method only depends on the code wheel mechanism to position the gear shifting position, when the code wheel mechanism fails, such as the conditions of code wheel abrasion, abnormal signal transmission and the like, the code wheel mechanism cannot be detected and found in time, and the gear shifting positioning misalignment of the selector can be caused, so that the problems of poor contact, heating and the like of the starting contact and the fixed contact are caused, and the working reliability of the on-load tap-changer is seriously affected. Therefore, how to improve the accuracy and reliability of the selector gear shift positioning of the on-load tap-changer has become a technical problem to be solved by those skilled in the art. Disclosure of Invention The invention provides a selector gear shifting and positioning method and system of an on-load tap-changer and a selector of the on-load tap-changer, which are used for solving the technical problem of how to improve the accuracy and reliability of the gear shifting and positioning of the selector of the on-load tap-changer and realizing the effect of improving the accuracy and reliability of the gear shifting and positioning of the selector of the on-load tap-changer. In a first aspect, the present invention provides a selector gear shifting positioning method of an on-load tap changer, where the selector includes a stepper motor, a fixed contact, a movable contact and a voltage detection loop, the voltage detection loop is connected with the movable contact, and the method includes: setting the operation state of the selector according to the corresponding relation between the contact position of the fixed contact and the movable contact and the voltage change of the movable contact; Sending a driving pulse signal to the stepping motor to control the stepping motor to drive the movable contact, and obtaining a feedback signal of a pulse encoder of the stepping motor, and obtaining a movement distance of the movable contact in the selector reaching each running state according to the driving pulse signal and the feedback signal; correcting the movement distance according to the voltage signal acquired by the voltage detection loop to obtain a corrected movement distance, and resetting the accumulated pulse number of the driving pulse signal according to the corrected movement distance so as to shift and position the selector. Preferably, the setting the operation state of the selector according to the correspondence between the contact positions of the stationary contact and the movable contact and the voltage change of the movable contact includes: When the left movable contact of the movable contact and the first odd fixed contact of the fixed contact are positioned at a first preset position and the voltage of the movable contact is continuously stable, the motion state of the selector