CN110244109B - Wide-area end screen grounding current three-dimensional map expression method - Google Patents
Wide-area end screen grounding current three-dimensional map expression method Download PDFInfo
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- CN110244109B CN110244109B CN201910604384.0A CN201910604384A CN110244109B CN 110244109 B CN110244109 B CN 110244109B CN 201910604384 A CN201910604384 A CN 201910604384A CN 110244109 B CN110244109 B CN 110244109B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
- G01R19/0092—Arrangements for measuring currents or voltages or for indicating presence or sign thereof measuring current only
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/12—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing
- G01R31/1227—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing of components, parts or materials
Abstract
The invention discloses a wide-area end screen grounding current three-dimensional map expression method. The invention is realized as follows: and selecting different monitoring points to install the sensors, wherein the monitoring points can select in-phase different monitoring points or same-side three-phase wide-area synchronous detection, acquiring and recording current values of all the monitoring points at the same moment, displaying the obtained data by using a three-dimensional statistical chart, and judging the dielectric loss condition according to the pattern variation trend. The interface expression of the invention is clear at a glance, and the insulation change of a certain observation point can be visually seen. The invention can detect the synchronism of three phases and can also detect the synchronism of in-phase monitoring points.
Description
Technical Field
The invention belongs to the field of map expression analysis, and particularly relates to a wide-area end screen grounding current three-dimensional map expression method.
Background
The outgoing line mode of the 110kV main transformer mainly adopts a capacitive sleeve, and a sleeve end screen is an important position for detecting parameters such as main transformer partial discharge signals, dielectric loss and the like. The grounding of the end screen mainly prevents the voltage and current introduced by the end screen from being electrified after the insulation damage, and has the function of protecting equipment and operators. The common detection method for the end screen grounding current is grounding resistance test, but the analysis of the monitoring data has the following defects:
the data is not specific, the numbers obtained by statistics are complex, the characters are various, and the comparison between the information change condition and different groups is not obvious.
Secondly, the graph is not three-dimensional, and the graph obtained by the two-dimensional graph can only reflect plane changes, namely two data changes, which are not three-dimensional enough.
Disclosure of Invention
The invention provides a wide-area end screen grounding current three-dimensional map expression method based on the defects of end screen grounding current measurement data expression. The specific idea is as follows:
and selecting different monitoring points to install the sensors, wherein the monitoring points can select in-phase different monitoring points or same-side three-phase wide-area synchronous detection, acquiring and recording current values of all the monitoring points at the same moment, displaying the obtained data by using a three-dimensional statistical chart, and judging the dielectric loss condition according to the pattern variation trend.
The technical scheme adopted by the invention for solving the technical problem comprises the following steps:
step (1): establishing a basic three-dimensional chart, wherein the establishment criterion of the basic chart is as follows:
the corresponding X axis is selected as a time axis t, the resolution of the time scale can be set (second, minute, hour, day, month and year) for the recording time acquired at the same time of all the monitoring points, and the resolution of the time axis can be selected according to actual requirements.
Selecting a Y axis as a test point axis D, representing the position of each monitoring point, and selecting the monitoring points to be statistically displayed according to actual requirements;
and selecting the Z axis as a current value I, and representing the real-time current value of each monitoring point.
Step (2): and mapping the corresponding time points, test points and current values to a three-dimensional map, and drawing a current change trend graph of all the monitoring points.
And (3): and performing data analysis on the completed monitoring statistical map, wherein the change trends of all monitoring points are consistent to indicate that the monitoring points are normal, and if the change trends of a certain monitoring point are inconsistent with those of other monitoring points, the insulation of the monitoring point is abnormal.
The invention has the following beneficial effects:
(1) the invention has clear interface and is clear at a glance, and the abnormal insulation of a certain monitoring point can be visually seen.
(2) The method has simple map drawing and innovatively applies the map to synchronously reflect the insulation condition of the monitoring point in a wide area.
Drawings
FIG. 1 is an illustration of an example of a map display according to the present invention.
Detailed Description
The present invention will be described in detail below with reference to the accompanying drawings, and it should be noted that the described embodiments are only for the understanding of the present invention, and do not limit the present invention in any way.
As shown in FIG. 1, the wide area synchronous detection of each phase AcT/BcT/CcT is displayed as a high-voltage side A/B/C and a medium-voltage side Am/Bm/Cm of a three-phase integrated main transformer and CT, and the current values of all monitoring points are recorded.
Step (1): establishing a basic three-dimensional chart, wherein the establishment criterion of the basic chart is as follows:
the corresponding X axis is selected as a time axis t, the resolution of the time scale can be set (second, minute, hour, day, month and year) for the recording time acquired at the same time of all the monitoring points, and the resolution of the time axis can be selected according to actual requirements. When the time scale resolution is selected as in fig. 1, all the current values at the monitoring points are recorded every two hours for 12 hours.
And selecting the Y axis as a test point axis D to represent the position of each monitoring point, and selecting the monitoring points needing to be statistically displayed according to actual requirements.
And selecting the Z axis as a current value I, and representing the real-time current value of each monitoring point.
Step (2): and mapping the corresponding time points, test points and current values to a three-dimensional map, and drawing a current change trend graph of all the monitoring points.
And (3): the completed monitoring statistical map is subjected to data analysis, and the method can simultaneously display results of in-phase different detection points or same-side three-phase wide-area synchronous detection, particularly referring to curve variation trend, as shown in fig. 1. And if the change trends of a certain monitoring point are inconsistent with those of other monitoring points, the insulation of the monitoring point is abnormal.
As shown in FIG. 1, the current variation trend of the medium voltage Bm is obviously different from that of other monitoring points, which shows that the insulation of the Bm phase sleeve is abnormal.
Claims (1)
1. A wide-area end screen grounding current three-dimensional map expression method is characterized by comprising the following steps:
step (1): establishing a basic three-dimensional chart, wherein the establishment criterion of the basic chart is as follows:
selecting a corresponding X axis as a time axis t, and setting the resolution of time scales according to requirements for the recording time acquired at the same time of all monitoring points;
selecting a Y axis as a test point axis D, representing the position of each monitoring point, and selecting the monitoring points to be statistically displayed according to actual requirements;
selecting a Z axis as a current value I, and representing the real-time current value of each monitoring point;
step (2): mapping the corresponding time points, test points and current values to a three-dimensional map, and drawing a current variation trend graph of all the monitoring points;
and (3): and performing data analysis on the completed monitoring statistical map, wherein the change trends of all monitoring points are consistent to indicate that the monitoring points are normal, and if the change trends of a certain monitoring point are inconsistent with those of other monitoring points, the insulation of the monitoring point is abnormal.
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| CN201910604384.0A CN110244109B (en) | 2019-07-05 | 2019-07-05 | Wide-area end screen grounding current three-dimensional map expression method |
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| CN110244109B true CN110244109B (en) | 2021-10-08 |
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| DE4220409C2 (en) * | 1992-06-19 | 1995-07-20 | Siemens Ag | Process for obtaining anomalies in a pipe to be examined |
| CN100516882C (en) * | 2007-03-09 | 2009-07-22 | 中国科学院上海微系统与信息技术研究所 | Testing method for impacting acceleration transducer transversely response using wave comparison |
| CN202903892U (en) * | 2012-05-15 | 2013-04-24 | 山东惠工电气股份有限公司 | A transformer station capacitance on-line monitoring device based on a wireless mode |
| CN105005665A (en) * | 2015-07-27 | 2015-10-28 | 广州供电局有限公司 | Method and system for ultrahigh frequency radiation characteristic simulation of oil impregnated paper condenser sleeve end screen |
| CN105182250B (en) * | 2015-08-24 | 2017-12-12 | 北京国电通网络技术有限公司 | A kind of non-intrusion type distributed power source output monitoring device |
| CN106093722B (en) * | 2016-06-13 | 2019-03-12 | 国网上海市电力公司 | A kind of positioning and recognition methods of cable local discharge |
| CN107632048A (en) * | 2017-05-25 | 2018-01-26 | 浙江海洋大学 | A kind of monitoring of LNAPLs subsurface three-dimensionals migration process and data processing method |
| CN109696478A (en) * | 2018-11-27 | 2019-04-30 | 福建省嘉泰智能装备有限公司 | A kind of monitoring method of combination acoustic emission energy and lathe information |
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