CN110058075B - Spot polymerization effect type current detection method - Google Patents
Spot polymerization effect type current detection method Download PDFInfo
- Publication number
- CN110058075B CN110058075B CN201910299804.9A CN201910299804A CN110058075B CN 110058075 B CN110058075 B CN 110058075B CN 201910299804 A CN201910299804 A CN 201910299804A CN 110058075 B CN110058075 B CN 110058075B
- Authority
- CN
- China
- Prior art keywords
- residual current
- current
- period interval
- residual
- value
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Images
Classifications
-
- 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
- G01R19/25—Arrangements for measuring currents or voltages or for indicating presence or sign thereof using digital measurement techniques
-
- 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
- G01R31/50—Testing of electric apparatus, lines, cables or components for short-circuits, continuity, leakage current or incorrect line connections
Abstract
The invention relates to a dot thermal polymerization effect type current detection method, which comprises the steps of sampling residual current of a detection point, preprocessing and carrying out differential operation on the residual current value, wherein a plurality of time points are taken as a period interval; if the relation line does not detect the inflection point and is parallel to the X axis, the residual current is in a normal range, and the residual current accumulated in the current period interval is counted into the total amount of the residual current; if the relation line detects the inflection point for the first time or is in the same direction with the X axisαJudging whether the residual current is larger than a set value of the sudden change current or not, and counting the residual current accumulated in the current period interval into the total amount of the residual current; if the relation line detects the inflection point for the second time or is in the same direction with the X axisβCorner, triggering residual current alarm; whether the total amount of residual current is larger than a threshold value or not is always confirmed, and an alarm is triggered once the total amount of residual current is larger than the threshold value. The invention solves the problem of false alarm of the current residual current, can distinguish normal electric leakage and leakage current with hazardous property, and helps users and workers to better judge the hidden condition of fire and make more accurate judgment.
Description
Technical Field
The present invention relates to measuring electrical variables; the technical field of measuring magnetic variables, in particular to a point thermal polymerization effect type current detection method.
Background
The residual current is leakage current, and the instantaneous current flowing through the main loop of the residual current action protection device is taken as the effective current value; when the residual current changes, the insulation of the live conductor to the ground is damaged, so that the link of detecting the residual current is needed to start the protection device to trip, thereby preventing electric shock and fire caused by grounding electric arc.
In the prior art, a mainstream residual current type electrical fire monitoring detector generally monitors residual current by adopting a simple current vector sum mode, and actually, leakage current in an actual line is uniformly distributed, and the uniformly distributed leakage current can be divided into mean line type distributed leakage current and mean point type distributed leakage current; the average line-type distributed leakage current is the current which is averagely leaked along the line and is caused by the earth distributed capacitance existing in the phase conductor, while the average point-type distributed leakage current is the very small leakage current existing in the form of points of various power transformation, distribution and utilization equipment, when the electrical equipment breaks down or the line is aged, the residual current is increased slightly, the residual current is not changed greatly compared with the residual current under the normal condition and is not easy to detect, the aging of the line is accelerated along with the increase of the residual current due to the accumulation of the energy of the residual current, and the cable insulation layer is broken down at a certain moment under the vicious circle, so that the arc short circuit of the phase line to the earth is possibly caused when the electric equipment is broken down, and further a fire disaster is caused.
Therefore, the normal leakage current is the leakage current which is evenly distributed on a line and electric equipment, the collection quantity of the normal leakage current can reach more than hundreds of milliamperes, but the leakage current which is evenly distributed is very tiny, so the normal leakage current is larger, the collection quantity is large, and the large current which is not concentrated at a certain point is not large, so that enough energy is not available to cause a fire disaster, the fire disaster is not a hidden danger of the fire disaster, and the leakage current which is evenly distributed is the main source of the electrical fire disaster; however, the current mainstream residual current type electrical fire monitoring detector cannot distinguish normal residual current from residual current with hazardous properties, and the monitoring of point heat accumulation effect type residual current is not in place, so that the fire can not be well prevented and cured from the source.
Disclosure of Invention
The invention solves the problems that in the prior art, a main-stream residual current type electric fire monitoring detector cannot distinguish normal residual current from residual current with hazardous properties, and the monitoring of point heat accumulation effect type residual current is not in place, so that the fire can not be well prevented and controlled from the source, and provides an optimized point heat accumulation effect type current detection method.
The invention adopts the technical scheme that a dot thermal polymerization effect type current detection method comprises the following steps:
step 1: initializing a cable use environment, wherein the cable working frequency is A; selecting a detection point for sampling and wiring;
step 2: adopting a high-speed AD sampling chip to sample the residual current of the detection point;
and step 3: preprocessing the residual current value of each time point in the sampling period;
and 4, step 4: carrying out differential operation on the preprocessed residual current value, and taking the residual current as a Y axis and the time as an X axis to obtain a relation line graph of the residual current and the time;
and 5: dividing a residual current and time relation line graph by taking a plurality of time points as a period interval;
step 6: if the inflection point is not detected by the relation line in the current period interval and is parallel to the X axis, the residual current is in a normal range, and the step 7 is carried out; if the relation line in the current period interval detects an inflection point for the first time or is in the same direction with the X axisαAnd (5) if the angle is not equal to the preset angle, performing step 8; if the relationship line in the current period interval detects the inflection point for the second time or is in the same direction with the X axisβAnd (5) if the angle is not equal to the preset angle, performing step 9; 0 < (R) >α＜β＜30°；
And 7: counting the residual current accumulated in the current period interval into the total residual current S, if the residual current is larger than the total residual current set threshold, performing the step 9, otherwise, returning to the step 2;
and 8: judging whether the corresponding residual current in a certain time period in the current period interval is greater than a set value of the sudden change current, if so, performing a step 9, otherwise, counting the residual current accumulated in the current period interval into a total residual current S, and if so, performing the step 9, otherwise, returning to the step 2;
and step 9: triggering residual current alarm.
Preferably, in step 1, the detection points include a mechanical damage point, a distortion point and an insulation layer aging point in the cable.
Preferably, in step 2, the frequency of sampling the residual current at the detection point by using the high-speed AD sampling chip is B, B = N × a, and N > 0.
Preferably, said N is 20.
Preferably, in step 3, the preprocessing includes filtering and analog-to-digital converting the sampled residual current value.
Preferably, the step 3 comprises the steps of:
step 3.1: amplifying the residual current value obtained by sampling;
step 3.2: filtering the amplified residual current value through a high-pass filtering module to filter low-frequency noise and power frequency interference;
step 3.3: and converting the filtered amplified residual current value through an analog-to-digital conversion module to obtain a digitized residual current value.
Preferably, in step 7, the residual current accumulated in the current period interval is a product of the period interval and the residual current.
Preferably, in the step 8, the accumulated residual current in the current period interval is a product of a half of a sum of a maximum value and a minimum value of the residual current and the period interval.
The invention provides an optimized point-heating polymerization effect type current detection method, which comprises the steps of initializing a cable using environment, selecting detection points for sampling and wiring, carrying out residual current sampling and preprocessing on the detection points, carrying out differential operation on the preprocessed residual current values, and dividing a residual current and time relation line graph by taking a plurality of time points as periodic intervals; if the relation line in the current period interval does not detect the inflection point and is parallel to the X axis, the residual current is in a normal range, and the residual current accumulated in the current period interval is counted into the total amount S of the residual current; if the relation line in the current period interval detects an inflection point for the first time or is in the same direction with the X axisαJudging whether the corresponding residual current in a time period in the current period interval is larger than the set value of the mutation current, and if not, counting the residual current accumulated in the current period interval into the total amount S of the residual current; if the relationship line in the current period interval detects the inflection point for the second time or is in the same direction with the X axisβIf yes, triggering residual current alarm; during the process, the accuracy is not maintainedAnd judging whether the total residual current S is greater than a set threshold value of the total residual current, and triggering residual current alarm once the total residual current S exceeds the set threshold value.
The invention solves the problem of false alarm of the current residual current, can distinguish normal electric leakage and leakage current with hazardous property, and helps users and workers to better judge the hidden condition of fire and make more accurate judgment.
Drawings
FIG. 1 is a schematic diagram of a relationship line between residual current and time obtained by using the residual current as Y axis and time as X axis in the present invention, wherein the dotted lines indicate sampling time, adjacent dotted lines indicate each sampling period, and the first corner point is in the form of a line with the X axisαAngle, second corner point and X axisβAn angle; the residual current before the first inflection point is in the normal range; a fault exists between the first inflection point and the second inflection point, and the residual current is increased but the arc is grounded without a stroke; the second inflection point indicates that an arcing ground has been established.
Detailed Description
The present invention is described in further detail with reference to the following examples, but the scope of the present invention is not limited thereto.
The invention relates to a dot thermal polymerization effect type current detection method, wherein a sampling circuit involved in the implementation process of the method can be set by a person skilled in the art according to the requirement.
The method comprises the following steps.
Step 1: initializing a cable use environment, wherein the cable working frequency is A; and selecting a detection point for sampling and wiring.
In the step 1, the detection points include mechanical damage points, distortion points and insulation layer aging points in the cable.
In the present invention, the detection points include, but are not limited to, mechanical damage points, twisting points, and insulation aging points in the cable, which are areas with high occurrence of electrical leakage problems and need special attention.
Step 2: and adopting a high-speed AD sampling chip to sample the residual current of the detection point.
And 2, adopting a high-speed AD sampling chip to sample the residual current of the detection points at a frequency of B, wherein B = N × A, and N is greater than 0.
And N is 20.
In the invention, the sampling action is controlled by using the frequency N times A to sample the residual current of the detection point, and the residual current sampling value with smaller distortion can be obtained due to larger frequency.
In the invention, N can be set to be a value of 30-50 under a general condition, so that numerical values of all points can be well sampled, and subsequent image distortion caused by over-dense sampling can be avoided.
And step 3: and preprocessing the residual current value at each time point in the sampling period.
In the step 3, the preprocessing includes filtering and analog-to-digital converting the residual current value obtained by sampling.
The step 3 comprises the following steps:
step 3.1: amplifying the residual current value obtained by sampling;
step 3.2: filtering the amplified residual current value through a high-pass filtering module to filter low-frequency noise and power frequency interference;
step 3.3: and converting the filtered amplified residual current value through an analog-to-digital conversion module to obtain a digitized residual current value.
In the invention, the filtering is used for ensuring that the data instability which can occur due to the rough surface, the background interference object and the like is removed.
In the invention, the filtering is median filtering in general, the median filtering is a nonlinear signal processing technology which is based on the ordering statistical theory and can effectively inhibit noise, the basic principle is that the value of one point in a digital image or a digital sequence is replaced by the median of each point value in a neighborhood of the point, and the surrounding pixel values are close to the true values, thereby eliminating isolated noise points.
And 4, step 4: and carrying out differential operation on the preprocessed residual current value, and taking the residual current as a Y axis and the time as an X axis to obtain a relation line graph of the residual current and the time.
In the invention, the differential operation of the preprocessed residual current value is carried out to generate a line graph, and the line graph may have a rising trend integrally or after smoothing, and accords with the trend of the point heat accumulation effect of the electric wire to be processed by the invention.
And 5: and dividing the residual current and time relation line graph by taking a plurality of time points as periodic intervals.
In the invention, the sampling detection time is continuous, so that analysis can be carried out according to images of broken lines in different time periods, and in order to facilitate the analysis operation, the residual current and the time relation line graph are divided into a plurality of lines with equal time.
Step 6: if the inflection point is not detected by the relation line in the current period interval and is parallel to the X axis, the residual current is in a normal range, and the step 7 is carried out; if the relation line in the current period interval detects an inflection point for the first time or is in the same direction with the X axisαAnd (5) if the angle is not equal to the preset angle, performing step 8; if the relationship line in the current period interval detects the inflection point for the second time or is in the same direction with the X axisβAnd (5) if the angle is not equal to the preset angle, performing step 9; 0 < (R) >α＜β＜30°。
And 7: and (4) counting the residual current accumulated in the current period interval into the total residual current S, if the residual current is larger than the total residual current set threshold, performing the step 9, and otherwise, returning to the step 2.
In step 7, the residual current accumulated in the current period interval is the product of the period interval and the residual current.
And 8: and (3) judging whether the corresponding residual current in a certain time period in the current period interval is greater than a sudden change current set value, if so, performing the step 9, otherwise, counting the residual current accumulated in the current period interval into a total residual current S, and if so, performing the step 9, otherwise, returning to the step 2.
In step 8, the residual current accumulated in the current period interval is the product of the half of the sum of the maximum value and the minimum value of the residual current and the period interval.
And step 9: triggering residual current alarm.
In the invention, the detection principle is that for a normal part, when the accumulated residual current of the part is larger than a set value, an alarm is triggered, and for an abrupt change part, when the abrupt change current is larger than the set value, the residual current alarm is triggered.
In the invention, when the relation line in the current period interval does not detect the inflection point and is parallel to the X axis, which indicates that the residual current is in the normal range, only the accumulated residual current in the current period interval is accumulated to count the total S value of the residual current and update the S value, and then the S value is judged whether to exceed the total S value of the residual current to set a threshold value.
In the normal range, the broken line is almost parallel to the X axis, so the accumulated residual current in the period interval is the product of the period interval and the residual current.
In the invention, a buffer section is arranged for the sudden change current for triggering alarm, the possibility of false alarm is reduced, and the hidden danger of the electrical fire can be tracked for a long time, wherein the buffer section comprises two sudden change ranges, and the angle of the corresponding broken line isαAndβ。
in the invention, when the relation line in the current period interval detects an inflection point for the first time or forms an inflection point with the X axisαAnd if the residual current is larger than the set value of the sudden change current, triggering the residual current alarm, otherwise, counting the total S value of the residual current and updating the S value, and subsequently, judging whether the value of the S exceeds the set threshold value of the total residual current.
In the invention, in the range of starting abnormity, the included angle between the broken line and the X axis is almost greater than 0, so the residual current value accumulated in the current period interval can be calculated in a trapezoidal calculation mode.
In the invention, when the relationship line in the current period interval detects the inflection point for the second time or forms an inflection point with the X axisβAnd when the alarm is in an angle, the possibility of fire disaster is shown, so that a residual current alarm is directly triggered.
The invention selects the cable by initializing the cable use environmentSampling and wiring the detection points, sampling and preprocessing residual current of the detection points, carrying out differential operation on the preprocessed residual current values, and dividing a residual current and time relation line graph by taking a plurality of time points as a period interval; if the relation line in the current period interval does not detect the inflection point and is parallel to the X axis, the residual current is in a normal range, and the residual current accumulated in the current period interval is counted into the total amount S of the residual current; if the relation line in the current period interval detects an inflection point for the first time or is in the same direction with the X axisαJudging whether the corresponding residual current in any certain time period in the current period interval is larger than the set value of the sudden change current, and if not, counting the residual current accumulated in the current period interval into the total amount S of the residual current; if the relationship line in the current period interval detects the inflection point for the second time or is in the same direction with the X axisβIf yes, triggering residual current alarm; in the process, whether the total residual current S is larger than the total residual current set threshold value or not is continuously confirmed, and once the total residual current S exceeds the total residual current set threshold value, the residual current alarm is triggered.
The invention solves the problem of false alarm of the current residual current, can distinguish normal electric leakage and leakage current with hazardous property, and helps users and workers to better judge the hidden condition of fire and make more accurate judgment.
Claims (8)
1. A dot thermal polymerization effect type current detection method is characterized in that: the method comprises the following steps:
step 1: initializing a cable use environment, wherein the cable working frequency is A; selecting a detection point for sampling and wiring;
step 2: adopting a high-speed AD sampling chip to sample the residual current of the detection point;
and step 3: preprocessing the residual current value of each time point in the sampling period;
and 4, step 4: carrying out differential operation on the preprocessed residual current value, and taking the residual current as a Y axis and the time as an X axis to obtain a relation line graph of the residual current and the time;
and 5: dividing a residual current and time relation line graph by taking a plurality of time points as a period interval;
step 6: if the inflection point is not detected by the relation line in the current period interval and is parallel to the X axis, the residual current is in a normal range, and the step 7 is carried out; if the relationship line in the current period interval detects an inflection point for the first time or forms an alpha angle with the X axis, performing the step 8; if the relationship line in the current period interval detects an inflection point for the second time or forms an angle beta with the X axis, performing the step 9; alpha is more than 0 and beta is more than 30 degrees;
and 7: counting the residual current accumulated in the current period interval into the total residual current S, if the total residual current S is larger than a set threshold value of the total residual current, performing the step 9, otherwise, returning to the step 2;
and 8: judging whether the corresponding residual current in a certain time period in the current period interval is larger than a set value of the sudden change current, if so, performing the step 9, otherwise, counting the residual current accumulated in the current period interval into a total residual current S, and if so, performing the step 9, otherwise, returning to the step 2;
and step 9: triggering residual current alarm.
2. The method of claim 1, wherein the method comprises: in the step 1, the detection points include mechanical damage points, distortion points and insulation layer aging points in the cable.
3. The method of claim 1, wherein the method comprises: and 2, performing residual current sampling on the detection points by using a high-speed AD sampling chip and using the frequency B which is N times of A, wherein B = N × A, and N is greater than 0.
4. The method of claim 3, wherein the method comprises: and N is 20.
5. The method of claim 1, wherein the method comprises: in the step 3, the preprocessing includes filtering and analog-to-digital converting the residual current value obtained by sampling.
6. The method of claim 5, wherein the method comprises: the step 3 comprises the following steps:
step 3.1: amplifying the residual current value obtained by sampling;
step 3.2: filtering the amplified residual current value through a high-pass filtering module to filter low-frequency noise and power frequency interference;
step 3.3: and converting the filtered amplified residual current value through an analog-to-digital conversion module to obtain a digitized residual current value.
7. The method of claim 1, wherein the method comprises: in step 7, the residual current accumulated in the current period interval is the product of the period interval and the residual current.
8. The method of claim 1, wherein the method comprises: in step 8, the residual current accumulated in the current period interval is the product of the half of the sum of the maximum value and the minimum value of the residual current and the period interval.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910299804.9A CN110058075B (en) | 2019-04-15 | 2019-04-15 | Spot polymerization effect type current detection method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910299804.9A CN110058075B (en) | 2019-04-15 | 2019-04-15 | Spot polymerization effect type current detection method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN110058075A CN110058075A (en) | 2019-07-26 |
| CN110058075B true CN110058075B (en) | 2021-03-05 |
Family
ID=67319104
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910299804.9A Active CN110058075B (en) | 2019-04-15 | 2019-04-15 | Spot polymerization effect type current detection method |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN110058075B (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110632375A (en) * | 2019-09-14 | 2019-12-31 | 杭州拓深科技有限公司 | Differential residual current detection method |
Citations (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2010048746A (en) * | 2008-08-25 | 2010-03-04 | Hioki Ee Corp | Insulation monitoring device |
| CN102220659A (en) * | 2011-06-21 | 2011-10-19 | 太原理工大学 | Preparation method of heat-resistant polyphenylene sulfide fiber |
| CN102354427A (en) * | 2011-09-27 | 2012-02-15 | 赵怀军 | method and device for flexibly identifying residual current-type electrical fire on line |
| KR20130063771A (en) * | 2011-12-07 | 2013-06-17 | 새턴정보통신(주) | Earth leakage breaker of automatic recovery type |
| CN103364696A (en) * | 2013-07-17 | 2013-10-23 | 上海思盛电力控制技术有限公司 | Intelligent distinguishing method of insulation characteristic of zinc oxide lightning arrester |
| CN103532083A (en) * | 2013-10-30 | 2014-01-22 | 国家电网公司 | Electric shock signal moment identification method and residual current protection action criterion |
| CN105576597A (en) * | 2016-02-29 | 2016-05-11 | 上海电机学院 | Residual current motion protection method and device |
| CN105572532A (en) * | 2015-12-17 | 2016-05-11 | 南京亚派科技股份有限公司 | Residual current sampling value processing method for electrical fire hazard monitoring product |
| CN107870281A (en) * | 2017-11-06 | 2018-04-03 | 福州大学 | One kind electric leakage and fault arc detection method and its device |
| CN108418179A (en) * | 2018-04-11 | 2018-08-17 | 扬州大学 | A kind of leakage current test fast protection circuit and guard method |
| CN108700632A (en) * | 2016-03-03 | 2018-10-23 | 住友电气工业株式会社 | Method for the insulation performance for assessing insulator |
| CN108876111A (en) * | 2018-05-25 | 2018-11-23 | 杭州拓深科技有限公司 | A kind of security against fire methods of marking of facing area environment |
| CN108898777A (en) * | 2018-08-29 | 2018-11-27 | 北京乐鸟科技有限公司 | A kind of electrical fires monitoring method and device |
-
2019
- 2019-04-15 CN CN201910299804.9A patent/CN110058075B/en active Active
Patent Citations (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2010048746A (en) * | 2008-08-25 | 2010-03-04 | Hioki Ee Corp | Insulation monitoring device |
| CN102220659A (en) * | 2011-06-21 | 2011-10-19 | 太原理工大学 | Preparation method of heat-resistant polyphenylene sulfide fiber |
| CN102354427A (en) * | 2011-09-27 | 2012-02-15 | 赵怀军 | method and device for flexibly identifying residual current-type electrical fire on line |
| KR20130063771A (en) * | 2011-12-07 | 2013-06-17 | 새턴정보통신(주) | Earth leakage breaker of automatic recovery type |
| CN103364696A (en) * | 2013-07-17 | 2013-10-23 | 上海思盛电力控制技术有限公司 | Intelligent distinguishing method of insulation characteristic of zinc oxide lightning arrester |
| CN103532083A (en) * | 2013-10-30 | 2014-01-22 | 国家电网公司 | Electric shock signal moment identification method and residual current protection action criterion |
| CN105572532A (en) * | 2015-12-17 | 2016-05-11 | 南京亚派科技股份有限公司 | Residual current sampling value processing method for electrical fire hazard monitoring product |
| CN105576597A (en) * | 2016-02-29 | 2016-05-11 | 上海电机学院 | Residual current motion protection method and device |
| CN108700632A (en) * | 2016-03-03 | 2018-10-23 | 住友电气工业株式会社 | Method for the insulation performance for assessing insulator |
| CN107870281A (en) * | 2017-11-06 | 2018-04-03 | 福州大学 | One kind electric leakage and fault arc detection method and its device |
| CN108418179A (en) * | 2018-04-11 | 2018-08-17 | 扬州大学 | A kind of leakage current test fast protection circuit and guard method |
| CN108876111A (en) * | 2018-05-25 | 2018-11-23 | 杭州拓深科技有限公司 | A kind of security against fire methods of marking of facing area environment |
| CN108898777A (en) * | 2018-08-29 | 2018-11-27 | 北京乐鸟科技有限公司 | A kind of electrical fires monitoring method and device |
Also Published As
| Publication number | Publication date |
|---|---|
| CN110058075A (en) | 2019-07-26 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US9046563B2 (en) | Arcing event detection | |
| US20160187406A1 (en) | Method and system for identifying lightning fault and the type thereof in the overhead transmission line | |
| JP5530594B2 (en) | Method and apparatus for detecting an arc phenomenon on at least one electrical cable | |
| CN1047887C (en) | Device for differentially protecting a power transformer | |
| US20130116944A1 (en) | Method and device to identify, record and store traveling wave heads in electric power systems | |
| US9244114B2 (en) | System and method for assessing faulty power-line insulator strings | |
| JP5513870B2 (en) | Arc detection using detailed and approximate coefficients of discrete wavelet transform | |
| JP2015145847A (en) | Direct current arc detection device and method | |
| JP4729610B2 (en) | Smoke detector | |
| JP2013521513A (en) | Evaluation of noise and overcurrent on power lines | |
| KR101007551B1 (en) | Method For Detecting Arc In Power Distribution System And System For Alerting Arc Using The Same Method | |
| CN110058075B (en) | Spot polymerization effect type current detection method | |
| KR102166324B1 (en) | Arc detection method by frequency analysis of pv system and a photovoltaic power generation system | |
| CN110073562B (en) | Overcurrent and short circuit detector | |
| JP2018151376A (en) | Evaluation of phase-resolved partial discharge | |
| CN109799404B (en) | Method and system for detecting degradation rate of surge protection device | |
| CN114778959A (en) | Intelligent lightning protection real-time online monitoring system | |
| KR20210067036A (en) | Arc Detection Device According To Arc Detection Algorithm | |
| CN106771500A (en) | A kind of HVDC transmission system difference channel current amount otherness detection method | |
| US20100271044A1 (en) | Remote detection of discharge on a power line network | |
| CN109375028A (en) | A kind of broken string recognition methods of high voltage power cable circulating current sensor and device | |
| JP2008191113A (en) | Partial discharge detector for cable end terminal part | |
| CN204188753U (en) | A kind of dry reactor office is placed on line monitoring system | |
| CN105911433B (en) | The recognition methods of transmission line lightning stroke type | |
| KR102243313B1 (en) | PARTIAL DISCHARGE JUDGING METHOD and DIAGNOSTIC SYSTEM |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| PE01 | Entry into force of the registration of the contract for pledge of patent right | ||
| PE01 | Entry into force of the registration of the contract for pledge of patent right |
Denomination of invention: A Method of Current Detection Based on Point Thermal Convergence Effect Effective date of registration: 20230314 Granted publication date: 20210305 Pledgee: Bank of China Limited Hangzhou Binjiang Branch Pledgor: HANGZHOU TPSON TECHNOLOGY Co.,Ltd. Registration number: Y2023330000520 |