CN106405283B - A kind of surge arrester failure method for early warning for overcoming ambient temperature and humidity to influence - Google Patents
A kind of surge arrester failure method for early warning for overcoming ambient temperature and humidity to influence Download PDFInfo
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- CN106405283B CN106405283B CN201610757612.4A CN201610757612A CN106405283B CN 106405283 B CN106405283 B CN 106405283B CN 201610757612 A CN201610757612 A CN 201610757612A CN 106405283 B CN106405283 B CN 106405283B
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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
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Abstract
The present invention relates to a kind of surge arrester failure method for early warning for overcoming ambient temperature and humidity to influence, and belong to arrester on-line monitoring technique field.1) the surge arrester failure method for early warning includes the following steps: in the set time period, to calculate the current in resistance property of M moment arrester, and choose current in resistance property minimum value of the smallest current in resistance property as the setting duration, wherein M >=2；2) on the basis of current time, N number of set period of time is continuously chosen forward, obtains N number of current in resistance property minimum value according to step 1), wherein N >=2；3) straight line fitting is carried out to N number of current in resistance property minimum value and obtains straight line y=ax+b, wherein y indicates current in resistance property minimum value, and x indicates the time；4) match value that current time current in resistance property is calculated according to above-mentioned fitting a straight line is alerted if the match value of current time current in resistance property is greater than alarm threshold.Method of the invention can prevent the device as caused by variation of ambient temperature from accidentally alerting, and improve the reliability of arrester monitoring and warning.
Description
Technical field
The present invention relates to arrester on-line monitoring technique fields, and in particular to a kind of to overcome the lightning-arrest of ambient temperature and humidity influence
Device fault early warning method.
Background technique
Currently, most of operating statuses for having run lightning arrester monitoring device are steady, but part arrester is due to mounting ring
Border, structure and manufacturer's difference, cause part arrester online monitoring data by environment temperature, humidity, rainfall and arrester
The influence of outer surface filth is more serious, and lightning arrester monitoring device can not accurate early warning.
Summary of the invention
The present invention provides a kind of surge arrester failure method for early warning for overcoming ambient temperature and humidity to influence, to solve existing keep away
Thunder device is easy to be influenced that the problem of accidentally alerting occurs by ambient temperature and humidity when carrying out fault warning by monitoring current in resistance property.
In order to solve the above technical problems, surge arrester failure method for early warning of the invention includes the following steps:
1) current in resistance property of M moment arrester in the set time period, is calculated, and chooses the smallest current in resistance property conduct
The current in resistance property minimum value of the setting duration, wherein M >=2；
2) on the basis of current time, N number of set period of time is continuously chosen forward, obtains N number of resistive electricity according to step 1)
Flow minimum value, wherein N >=2；
3) straight line fitting is carried out to N number of current in resistance property minimum value and obtains straight line y=ax+b, wherein y indicates current in resistance property, x
Indicate the time；
4) match value of current time current in resistance property is calculated according to above-mentioned fitting a straight line, if current time current in resistance property is quasi-
Conjunction value is greater than alarm threshold, is alerted.
If the match value of current time current in resistance property is less than alarm threshold in step 4), and current time current in resistance property is practical
When value is greater than alarm threshold less than jump threshold value, alerted.
If the match value of current time current in resistance property is less than alarm threshold in step 4), and current time current in resistance property is practical
When value is greater than alarm threshold and jump threshold value, the transitional states of adjacent two phase data are differentiated, if data jump more than two-phase occurs,
It does not alert, if data jump occurs for an only phase, is alerted.
The jump threshold value is current in resistance property when the match value of current time current in resistance property is operated normally plus arrester
Variable quantity δi。
The alarm threshold be arrester initially put into operation the stable moment current in resistance property increase by 100% value.
The set period of time is 1 day, M=24, N=60.
The match value I of the current time current in resistance propertyfit=60a+b.
Straight line fitting is carried out using least square method in step 3).
The calculating process of the current in resistance property are as follows: 1) acquire arrester three-phase voltage, current signal；2) using in complete cycle Fu
Leaf transformation calculates the amplitude and phase of arrester three-phase voltage, electric current；3) resistive using fundamental wave sciagraphy calculating arrester three-phase
Current value.
By the research to leakage current of an arrester and current in resistance property historical data, ring especially is found to the research of arrester
There are certain periodicity for influence of the border temperature and humidity to arrester monitoring data.The temperature and humidity of arrester resistance current and environment
Variation tendency in a certain time interval is consistent.When environment temperature or humidity influence become smaller, the number of arrester resistance current
Value tends to normal, while its Fourier spectrum has certain periodicity.And the defect of the true aging of arrester valve piece or dampness
It is irreversible.Slowly due to arrester aging or dampness variation, the curve of the daily minimum value of current in resistance property meets straight line
Characteristic, the match value energy that straight line fitting obtains is carried out by the lightning arrester characteristic curve of the minimum value to daily arrester electric current
In the influence for avoiding ambient temperature and humidity while the operation trend that can also reflect arrester resistance current.
Beneficial effects of the present invention: the present invention utilizes the relationship of the time correlation of current in resistance property and ambient temperature and humidity, to one
It fixes time and is spaced the minimum value progress straight line fitting of interior arrester resistance current, current time is then obtained according to the fitting a straight line
Match value, which is compared with alarm threshold and judges whether arrester breaks down.The match value avoids ring
The influence of border temperature and humidity, and can also reflect the operation trend of arrester resistance current, thus, using the match value as resistive
Electric current carries out to prevent the device as caused by variation of ambient temperature from accidentally alerting when surge arrester failure monitoring, improves arrester prison
Survey the reliability of early warning.
The actual value of current in resistance property is also compared by the present invention with alarm threshold and jump threshold value, is sentenced according to comparison result
Disconnected device whether early warning, avoid because environment influence due to occurs mistake alarm, also avoid part surge arrester failure generation speed compared with
Leakage is caused to alert fastly.
For apparatus of the present invention in specific value, each integral point obtains 1 current in resistance property value, takes 24 current in resistance property daily
Value, and choose wherein minimum value as current in resistance property day minimum value, so continuously acquire 60 current in resistance property day minimum value, to keep away
Exempting from continuous rainy weather causes current in resistance property day minimum value to have deviation, and causes matched curve deviation larger.
Detailed description of the invention
Fig. 1 is arrester monitoring system diagram of the present embodiment based on FT3 fiber optic communication；
Fig. 2 is the present embodiment arrester resistance current calculation flow chart；
Fig. 3 is the arrester resistance current minimum value fitting a straight line that the present embodiment changes over time；
Fig. 4 is the present embodiment arrester dependent diagnostic parameter geometrical relationship figure；
Fig. 5 is that the present embodiment arrester diagnoses early warning flow chart.
Specific embodiment
With reference to the accompanying drawing, technical solution of the present invention is further described in detail.
The method for early warning of the present embodiment includes the following steps:
1) current in resistance property of M moment arrester in the set time period, is calculated, and chooses the smallest current in resistance property conduct
The current in resistance property minimum value of the setting duration, wherein M >=2；
2) on the basis of current time, N number of set period of time is continuously chosen forward, obtains N number of resistive electricity according to step 1)
Flow minimum value, wherein N >=2；
3) straight line fitting is carried out to N number of current in resistance property minimum value and obtains straight line y=ax+b, wherein y indicates current in resistance property, x
Indicate the time；
4) match value of current time current in resistance property is calculated according to above-mentioned fitting a straight line, if current time current in resistance property is quasi-
Conjunction value is greater than alarm threshold, is alerted.
Below by taking arrester A phase signals as an example, wherein set period of time be 1 day, M=24, N=60, to the above method into
Row is discussed in detail:
Firstly, receiving arrester A phase current and information of voltage, and resampling and data synchronization are carried out, utilizes complete cycle fourier
Then the amplitude and phase of transformation calculations electric current, voltage signal calculate the resistive electricity at A phase a certain moment using fundamental wave sciagraphy
Stream, i.e., every integral point calculates a current in resistance property in 1 day, amounts to and calculates 24 current in resistance property, chooses minimum value therein as resistive
Electric current day minimum value.The calculating process of current in resistance property is as shown in Figure 2.
To avoid causing continuous rainy days current in resistance property day minimum value larger, to cause matched curve deviation larger, even
The current in resistance property day minimum Value Data of storage 60 days is renewed, and is stored in array Ir[60]。
After obtaining current in resistance property day minimum Value Data, straight line fitting is carried out according to these data, in the present embodiment
Realize that fitting is carried out based on principle of least square method, detailed process is as follows:
If shown in the band ginseng equation such as formula (1) of the least squares line fitting straight line of arrester resistance current minimum value:
Y=ax+b (1)
For array Ir[60], according to shown in the error Q such as formula (2) of principle of least square method:
Q=∑ (yi-y)2=∑ (yi-ax-b)2 (2)
Then the smallest condition of Q isSo as to calculate a, shown in the value of b such as formula (3):
Wherein, n indicates the total number of current in resistance property day minimum value.
As other embodiments, it is quasi- that straight line can also be carried out by the way of other straight line fittings in the prior art
It closes, such as by poor method, no longer introduces one by one here.
The match value I at arrester current timefitIt can be according to linear equation Ifit=60a+b is calculated.The value can be made
For differentiate arrester resistance current whether the important evidence of early warning, Fig. 3 be arrester resistance current fitting a straight line variation tendency.
When calculating the match value at arrester current time, required data when needing to carry out curve fitting, and being fitted,
It is continuous first 60 days on the basis of current time current in resistance property day minimum values.That is, taking stabilization when initially putting into operation
Current in resistance property day minimum value I afterwardsinitCurrent in resistance property array is initialized, then carries out data update daily, to guarantee
When calculating the match value at current time, the current in resistance property minimum Value Data to carry out curve fitting is newest.
After obtaining the match value at current time, by the match value at current time, the actual value at current time with alarm
Threshold value, jump threshold value are compared, and realize the early warning of arrester resistance current, shown in detailed process Fig. 5, steps are as follows:
1) judge whether current in resistance property actual value is greater than alarm threshold, if more than judging whether current in resistance property match value is big
In alarm threshold, otherwise, device is not alerted；If whether current in resistance property match value is greater than alarm threshold, device is alerted, no
Then, it enters step 2)；
2) judge whether current in resistance property match value is less than jump threshold value, if being less than, device carries out early warning, otherwise enters step
3)。
3) transitional states of adjacent two phase data of comprehensive distinguishing, arrester data jump more than two-phase is recognized at this time if it exists
Too big for environment influence, which does not alert；If only single-phase generation data jump, the phase early warning, avoid part surge arrester failure
Fast speed, which occurs, causes leakage to alert.
Alarm threshold acquisition process in above-mentioned steps are as follows: arrester alarm threshold uses and stationary value when initial launch
It compares, according to the requirement of transformer equipment live detection job guide opinion, the value when current in resistance property increases by 100% is as alarm
Definite value Iset, current in resistance property here is the current time current in resistance property value calculated after initially putting into operation normal operation.
The calculating process of jump threshold value in above-mentioned steps are as follows: for avoid current in resistance property early warning be jump caused by a certain factor
Become, simply may cause erroneous judgement for the value of incipient stability moment or last moment as jump threshold value, the present embodiment will jump
Value IjumpThe match value of current time current in resistance property is set as plus δi, as shown in formula (4):
Ijump=60a+b+ δi (4)
Wherein, δiValue be that arrester installs current in resistance property variable quantity in normal circumstances, varying environment is arranged
It is different.
The actual value at current time in above-mentioned steps are as follows: will not be too same rapidly in view of the development speed of arrester real defect
When current in resistance property day monitoring minimum value can avoid the influence of ambient temperature and humidity to a certain extent, therefore use newest current in resistance property
The actual value I of day minimum value as current timereal。
By taking Fig. 4 as an example, the prealarming process of arrester resistance current is discussed in detail:
1) to the real-time current in resistance property value I of device operationrealWith arrester alarm threshold IsetIt is compared, if Ireal>
Iset2) Shi Ze is transferred to, otherwise handle without rear class early warning.
2) straight line fitting is carried out to history minimum Value Data and calculates current current in resistance property match value Ifit, judgment means are current
Whether current in resistance property match value is greater than alarm threshold, i.e. Ifit> IsetWhen, as shown in the area Tu Zhong C, device fixation is alerted；If
Ifit< IsetWhen, then enter 3).
If 3) practical current in resistance property value Ireal> Iset, then data occur in the area A B, if data are in the area B at this time, i.e.,
Ireal< Ijump, then illustrate that the real time data does not jump, but the value is very big, therefore when data are at the area B, this is mutually fixed
Early warning.If being transferred to 4) in the area A.
4) since the area A can not differentiate whether the phase should be alerted, it need to integrate and be differentiated, A phase is fixed at this time
Jump introduces lateral comparison approach, is differentiated respectively with whether the B phase and C phase data at interval jump, is transferred to 5).
5) relevant differentiation is carried out by taking A phase as an example, otherwise it is 0 that it is 1 that wherein actual value, which is greater than hop value,.If having in three-phase
There is jump in two-phase or more, then current arrester state is locking alarm status, without alarm: being otherwise transferred to 6)
6) when only A phase jumps, then early warning is carried out, at this time for the early warning under fast-changing fault condition.
Being not limited to above-mentioned value for set period of time, the value of M, N in the present embodiment can select according to actual needs
It takes, if set period of time may be configured as two days, three days etc., M can only be set as 20,12 etc., and N may be configured as 50,70 etc..
Claims (10)
1. a kind of surge arrester failure method for early warning for overcoming ambient temperature and humidity to influence, which is characterized in that this method includes following step
It is rapid:
1) current in resistance property of M moment arrester in the set time period, is calculated, and chooses the smallest current in resistance property and is set as this
The long current in resistance property minimum value of timing, wherein M >=2；
2) on the basis of current time, N number of set period of time is continuously chosen forward, obtains N number of current in resistance property most according to step 1)
Small value, wherein N >=2；
3) straight line fitting is carried out to N number of current in resistance property minimum value and obtains straight line y=ax+b, wherein y indicates that current in resistance property, x indicate
Time；
4) match value of current time current in resistance property is calculated according to fitting a straight line y=ax+b, if current time current in resistance property is quasi-
Conjunction value is greater than alarm threshold, is alerted.
2. the surge arrester failure method for early warning for overcoming ambient temperature and humidity to influence according to claim 1, which is characterized in that step
4) if the match value of current time current in resistance property is less than alarm threshold in, and current time current in resistance property actual value is greater than alarm threshold
When value is less than jump threshold value, alerted.
3. the surge arrester failure method for early warning for overcoming ambient temperature and humidity to influence according to claim 1, which is characterized in that step
4) if the match value of current time current in resistance property is less than alarm threshold in, and current time current in resistance property actual value is greater than alarm threshold
When value and jump threshold value, differentiate that the transitional states of adjacent two phase data do not alert if data jump more than two-phase occurs, if only
There is a phase that data jump occurs, is then alerted.
4. the surge arrester failure method for early warning for overcoming ambient temperature and humidity to influence according to claim 2, which is characterized in that described
Jump the variable quantity δ of current in resistance property when the match value that threshold value is current time current in resistance property is operated normally plus arresteri。
5. the surge arrester failure method for early warning for overcoming ambient temperature and humidity to influence according to claim 1, which is characterized in that described
Alarm threshold be arrester initially put into operation the stable moment current in resistance property increase by 100% value.
6. the surge arrester failure method for early warning for overcoming ambient temperature and humidity to influence according to claim 1, which is characterized in that described
Set period of time is 1 day, M=24, N=60.
7. the surge arrester failure method for early warning for overcoming ambient temperature and humidity to influence according to claim 6, which is characterized in that described
The match value I of current time current in resistance propertyfit=60a+b.
8. the surge arrester failure method for early warning for overcoming ambient temperature and humidity to influence according to claim 1, which is characterized in that step
3) straight line fitting is carried out using least square method in.
9. -8 any surge arrester failure method for early warning for overcoming ambient temperature and humidity to influence, feature exist according to claim 1
In the calculating process of the current in resistance property are as follows: 1) acquire arrester three-phase voltage, current signal；2) become using complete cycle Fourier
Change the amplitude and phase for calculating arrester three-phase voltage, electric current；3) arrester three-phase current in resistance property is calculated using fundamental wave sciagraphy
Value.
10. the surge arrester failure method for early warning for overcoming ambient temperature and humidity to influence according to claim 1, which is characterized in that
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| CN108224548B (en) * | 2017-12-29 | 2020-05-05 | 新奥泛能网络科技股份有限公司 | Energy supply day number calculation method |
| CN109406926A (en) * | 2018-09-10 | 2019-03-01 | 国网江苏省电力有限公司连云港供电分公司 | The calculation method that environmental factor influences leakage current of an arrester |
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| JP2001228198A (en) * | 2000-02-18 | 2001-08-24 | Tohoku Electric Power Co Inc | Arrester deterioration detector |
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