CN-121978414-A - Dielectric loss tangent measuring method, device, computer equipment, medium and product

CN121978414ACN 121978414 ACN121978414 ACN 121978414ACN-121978414-A

Abstract

The application relates to a dielectric loss factor measuring method, a dielectric loss factor measuring device, a dielectric loss factor measuring computer device, a dielectric and a dielectric product. The method comprises the steps of obtaining time domain phase signals corresponding to three phases of three-phase equipment respectively, wherein the time domain phase signals corresponding to each phase are collected through a collecting device arranged in a collecting channel of the phase, sampling starting time and sampling frequency of the collecting device arranged in the collecting channel of each phase are the same, carrying out noise reduction and frequency domain conversion processing on the time domain phase signals corresponding to the phase according to each phase to obtain frequency domain phase signals corresponding to the phase, and determining a dielectric loss factor corresponding to each phase according to the frequency domain phase signals corresponding to the three phases respectively. The dielectric loss factor of the three-phase equipment can be accurately measured by adopting the method.

Inventors

SUN QIN
LIU ZILONG
XU CHUN
YANG XIANZHI
LUO JIALIN
NIE ZHIJIE
Chang sai

Assignees

南方电网数字电网科技(广东)有限公司

Dates

Publication Date: 20260505
Application Date: 20260209

Claims (10)

1. A method of dielectric loss tangent measurement, the method comprising: Acquiring time domain phase signals corresponding to three phases of three-phase equipment respectively, wherein the time domain phase signals corresponding to each phase are acquired through acquisition devices installed in acquisition channels of the phases, and the sampling starting time and the sampling frequency of the acquisition devices installed in the acquisition channels of each phase are the same; For each phase, carrying out noise reduction and frequency domain conversion processing on a time domain phase signal corresponding to the phase to obtain a frequency domain phase signal corresponding to the phase; And determining the dielectric loss factor corresponding to each phase according to the frequency domain phase signals corresponding to the three phases respectively.
2. The method according to claim 1, wherein the acquiring time domain phase signals corresponding to three phases of a three-phase device, respectively, comprises: the method comprises the steps of sending an acquisition triggering instruction to a synchronous triggering module, wherein the acquisition triggering instruction is used for indicating the synchronous triggering module to trigger acquisition devices in acquisition channels with different phases to synchronously acquire; and receiving the time domain phase signals acquired by the acquisition devices in the acquisition channels of each phase.
3. The method of claim 1, wherein the frequency domain phase signal for each phase comprises a fundamental voltage signal and a fundamental current signal; The determining the dielectric loss factor corresponding to each phase according to the frequency domain phase signals respectively corresponding to the three phases includes: determining a voltage average value according to the fundamental voltage signals respectively corresponding to the three phases; For each phase, correcting the fundamental voltage signal corresponding to the phase according to the deviation rate between the fundamental voltage signal corresponding to the phase and the voltage average value to obtain a corrected voltage signal corresponding to the phase, and Correcting the fundamental current signal corresponding to the phase according to the inherent phase relation between the fundamental current signal corresponding to the phase and the three phases to obtain a corrected current signal corresponding to the phase; And determining the dielectric loss factors corresponding to the phases according to the corrected voltage signals and the corrected current signals respectively corresponding to the three phases.
4. A method according to claim 3, wherein said modifying the phase-corresponding fundamental current signal according to the inherent phase relationship between the phase-corresponding fundamental current signal and the three phases to obtain the phase-corresponding modified current signal comprises: Determining a first phase difference between the phase and the fundamental current signal corresponding to each of the other phases according to the inherent phase relationship of the three phases; and under the condition that the current interference exists in the phase according to the phase difference threshold value and each first phase difference, correcting the fundamental current signal corresponding to the phase according to the inherent phase relation of the other two phases to obtain a corrected current signal corresponding to the phase.
5. A method according to claim 3, wherein said determining the dielectric loss tangent for each of said three phases from the corrected voltage signal and the corrected current signal for each of said three phases comprises: for any phase, performing cross correlation analysis on the corrected voltage signal and the corrected current signal corresponding to the phase to obtain the time difference between the voltage and the current corresponding to the phase; Determining a second phase difference between the voltage and the current corresponding to the phase according to the time difference; and determining a dielectric loss factor corresponding to the phase according to the second phase difference.
6. The method of claim 5, wherein determining the dielectric loss tangent for the phase based on the second phase difference comprises: determining an initial loss factor corresponding to the phase according to the second phase difference; determining whether the initial loss factor of the phase is an abnormal value according to the difference value between the initial loss factors corresponding to the phases and the average value of the initial loss factors corresponding to the other two phases; If yes, determining a dielectric loss factor corresponding to the phase based on a preset prediction model according to the historical acquisition signal of the phase; if not, determining the initial loss factor as the dielectric loss factor corresponding to the phase.
7. A dielectric loss tangent measurement device, the device comprising: the signal acquisition module is used for acquiring time domain phase signals corresponding to three phases of the three-phase equipment respectively, wherein the time domain phase signals corresponding to each phase are acquired through acquisition devices installed in acquisition channels of the phases, and the sampling starting time and the sampling frequency of the acquisition devices installed in the acquisition channels of each phase are the same; The time-frequency conversion module is used for carrying out noise reduction and frequency domain conversion processing on the time domain phase signals corresponding to the phases aiming at each phase to obtain frequency domain phase signals corresponding to the phases; and the factor determining module is used for determining the dielectric loss factor corresponding to each phase according to the frequency domain phase signals respectively corresponding to the three phases.
8. A computer device comprising a memory and a processor, the memory storing a computer program, characterized in that the processor implements the steps of the method of any of claims 1 to 6 when the computer program is executed.
9. A computer readable storage medium, on which a computer program is stored, characterized in that the computer program, when being executed by a processor, implements the steps of the method of any of claims 1 to 6.
10. A computer program product comprising a computer program, characterized in that the computer program, when being executed by a processor, implements the steps of the method of any of claims 1 to 6.

Description

Dielectric loss tangent measuring method, device, computer equipment, medium and product Technical Field The present application relates to the field of power systems, and in particular, to a method, an apparatus, a computer device, a medium, and a product for measuring a dielectric loss tangent. Background The dielectric loss factor is a core index for evaluating the insulation performance of the power equipment, and the larger the value is, the more serious the energy loss of the dielectric is, and the higher the risk of insulation aging or defect is. Currently, a single-channel fractional measurement mode is adopted for dielectric loss measurement of three-phase equipment, namely A, B, C three phases are measured sequentially through a single-channel dielectric loss measuring instrument. The existing multichannel dielectric loss measurement technology focuses on parallel acquisition, but the core problems of synchronicity and interference suppression are not solved, so that the phase difference measurement deviation of three-phase voltage and current signals is caused, and the calculation accuracy of a dielectric loss factor is further affected. Disclosure of Invention Based on the above, it is necessary to provide a dielectric loss tangent measuring method, apparatus, computer device, medium and product capable of precisely measuring the dielectric loss tangent of a three-phase device. In a first aspect, the present application provides a dielectric loss tangent measurement method, including: Acquiring time domain phase signals corresponding to three phases of three-phase equipment respectively, wherein the time domain phase signals corresponding to each phase are acquired through acquisition devices installed in acquisition channels of the phases, and the sampling starting time and the sampling frequency of the acquisition devices installed in the acquisition channels of each phase are the same; For each phase, carrying out noise reduction and frequency domain conversion processing on a time domain phase signal corresponding to the phase to obtain a frequency domain phase signal corresponding to the phase; And determining the dielectric loss factor corresponding to each phase according to the frequency domain phase signals corresponding to the three phases respectively. In one embodiment, the acquiring time domain phase signals corresponding to three phases of the three-phase device includes: the method comprises the steps of sending an acquisition triggering instruction to a synchronous triggering module, wherein the acquisition triggering instruction is used for indicating the synchronous triggering module to trigger acquisition devices in acquisition channels with different phases to synchronously acquire; and receiving the time domain phase signals acquired by the acquisition devices in the acquisition channels of each phase. In one embodiment, the frequency domain phase signal corresponding to each phase includes a fundamental voltage signal and a fundamental current signal; The determining the dielectric loss factor corresponding to each phase according to the frequency domain phase signals respectively corresponding to the three phases includes: determining a voltage average value according to the fundamental voltage signals respectively corresponding to the three phases; For each phase, correcting the fundamental voltage signal corresponding to the phase according to the deviation rate between the fundamental voltage signal corresponding to the phase and the voltage average value to obtain a corrected voltage signal corresponding to the phase, and Correcting the fundamental current signal corresponding to the phase according to the inherent phase relation between the fundamental current signal corresponding to the phase and the three phases to obtain a corrected current signal corresponding to the phase; And determining the dielectric loss factors corresponding to the phases according to the corrected voltage signals and the corrected current signals respectively corresponding to the three phases. In one embodiment, the correcting the fundamental current signal corresponding to the phase according to the inherent phase relation between the fundamental current signal corresponding to the phase and the three phases to obtain the corrected current signal corresponding to the phase includes: Determining a first phase difference between the phase and the fundamental current signal corresponding to each of the other phases according to the inherent phase relationship of the three phases; and under the condition that the current interference exists in the phase according to the phase difference threshold value and each first phase difference, correcting the fundamental current signal corresponding to the phase according to the inherent phase relation of the other two phases to obtain a corrected current signal corresponding to the phase. In one embodiment, the determining the dielectric loss factor co