JPH11273476A - Polluted insulator estimating method and device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an estimated value matching a measured value without requiring an expensive apparatus and manual work by using the moving average value of the wind velocity during the elapsed time so far at every fixed time from the measurement start time. SOLUTION: The pollution quantity when the time t1 elapses is obtained as ESDD1 =p.V1 <n> .t1 <n> , where V1 -Vi are histories of wind velocity values during the time t1 -ti from the measurement start time, (p) is a coefficient, and (n) is preferably set to 1.7-3.5. The pollution quantity when the time t2 elapses is obtained as ESDD2 =p (V1 +V2 )/2}<n> .(t1 +t2 )<n> by using the moving average (V1 +V2 )/2 of the wind velocity during the time (t1 +t2 ). The pollution quantity when the time t3 elapses is obtained as ESDD3 =p (V1 +V2 +V3 )/3}n .(t1 +t2 +t3 )<n> by using the moving average (V1 +V2 +V3 )/3 of the wind velocity during the time (t1 +t2 +t3 ). The pollution quantity is likewise calculated thereafter.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for estimating the amount of salt adhering to an insulator in a power plant, a substation, a transmission line, a distribution line, or the like, and estimating the contamination of the insulator for determining the timing at which the insulator should be cleaned. It relates to a method and an apparatus.

[0002]

2. Description of the Related Art The surface of an insulator is contaminated by salt adherence, and if the amount of adhered salt exceeds an allowable value, insulation of the insulator is destroyed, which may lead to a power failure due to a flashover accident. Therefore, it is necessary to grasp the degree of insulator contamination and perform maintenance work such as insulator cleaning before the amount of attached salt reaches an allowable value. For this purpose, the following three methods have been conventionally known as methods for grasping the amount of insulator fouling (the amount of attached salt).

The first is a brush washing method. In this method, the salt attached to the surface of the exposed pilot insulator is washed away with distilled water using a brush, and the amount of the attached salt is quantified from the conductivity of the aqueous solution, the volume of the aqueous solution, and the surface area of the insulator. This method is the most basic method, but has the drawback that it involves danger when a typhoon strikes because it is a manual operation, and that the measured values are liable to vary due to individual differences.
In addition, there is a disadvantage that not only long time is required for the measurement, but also data of the amount of insulator fouling cannot be obtained continuously because only the intermittent measurement can be performed.

The second is a method using an automatic fouling detector.
This is an automated version of the brush-washing method described above. The pilot insulator is automatically guided to the washing tank, and the salt attached to the insulator surface is dissolved in the washing water by ultrasonic cleaning or the like, and a device that measures the conductivity of the insulator is used. Devices and the like that measure the leakage current on the surface and convert it to the amount of insulator fouling have been put to practical use. Although this method does not require any manpower, it has the same drawbacks as the brush washing method that the apparatus is expensive, the measurement time is long, and only intermittent measurement can be performed, so that data on the amount of soiled insulator cannot be obtained continuously.

[0005] A third method is an estimation method using a wind range. This is done by measuring the average wind speed and using an index n determined in advance based on the correlation with the amount of insulator salt obtained under the same environment, and using a formula of insulator fouling amount = (average wind speed) ⁿ × time at regular intervals. In this method, the amount of insulator fouling is determined and the cumulative value is calculated. This method is disclosed in Japanese Patent No. 1035783 of the present applicant. Unlike the above two methods, since a pilot insulator is not used, there is an advantage that the amount of insulator contamination can be continuously estimated.

[0006] This third method is based on the following logic. First, the amount of salt passing through a unit area orthogonal to the wind direction is represented by C when the air salt amount is C and the wind speed is V.
· Expressed as V · dt. Assuming that the rate of adhesion to the insulator is a, the amount W of adhesion and contamination is represented by W = ∫a · C · V · dt. This aerial salt content C is generally given by C = b · V ^2, where b is a coefficient, and this equation is substituted into the above equation to obtain W = ∫a · b · V ² · V · dt. = ΣgV ³ · t
Becomes This method is a method of measuring the average wind speed V for a certain period of time such as 1 minute, 10 minutes, 60 minutes or the like, obtaining V ³ , multiplying it by a certain period of time t, and cumulatively adding the values to estimate the cumulative amount of contamination. . However, although the estimated value of the amount of insulator contamination obtained by the third method is correlated with the actually measured value, it often did not match the actually measured value even when the coefficient was changed.

[0007]

SUMMARY OF THE INVENTION The present invention relates to the above-described third embodiment.
The present invention has been made to solve the problem of the method (1), and to provide a method and an apparatus for estimating insulator fouling, which can obtain an estimated value which is in agreement with an actually measured value without using expensive equipment or manpower.

[0008]

The present inventor studied the reason why the estimated value of the amount of insulator fouling obtained in the third method does not match the actually measured value. It was clarified that the cause was caused by the fact that it was proportional to the square of V. That is, the amount of salt C in the air is related to the height of a wave on the sea that is windward from the measurement point, and the height of the wave depends on the wind speed and the time during which the wind continues to be blown (continuous blowing time). Therefore, no matter how fast the wind speed is, the salt content C in the air does not immediately increase. Therefore, a correct estimate of the amount of insulator fouling cannot be obtained unless the history of the wind speed values up to the measurement time is also taken into consideration.

The present invention has been completed on the basis of the above findings and experimental verification. The first method for estimating insulator contamination according to the first aspect of the present invention estimates the amount of insulator contamination by the expression of wind speed and time. The method is characterized in that a moving average value of the wind speed during an elapsed time from the start of the measurement to the fixed time is used at regular intervals. In the insulator contamination estimation method according to the second aspect of the present invention, when estimating the amount of insulator contamination by an expression of wind speed ⁿ × time ⁿ , the wind speed is calculated as a wind speed during a certain period of time from the start of measurement. An average value is used, and a value of 1.7 to 3.5 is used as n. A third aspect of the present invention is a device for estimating insulator fouling, comprising: a wind direction anemometer, a timer capable of measuring an elapsed time from a measurement start time, and a moving average value of a wind speed during a predetermined time from the measurement start time to a predetermined time. And a data processing device for calculating the amount of insulator fouling by the formula of wind speed ⁿ × time ⁿ .

According to the present invention, the amount of insulator fouling is estimated in consideration of the history of the wind speed values from the start of measurement to the time of measurement, so that an estimated value that matches the actually measured value can be obtained as described below. . It should be noted that since rapid pollution of the insulator is considered to be a problem only when a typhoon strikes, it is preferable to select a time point when the wind speed value exceeds a set value due to a typhoon approach or the like.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of the present invention will be described below. FIG. 1 is a block diagram showing an apparatus for estimating insulator fouling according to the present invention. Reference numeral 1 denotes a wind direction and anemometer, 2 denotes a rain gauge, 3 denotes a timer, and 4 denotes a calculation as described below based on data from these devices. Data processing devices such as personal computers,
Reference numeral 5 denotes an insulator cleaning device which is operated when the estimated value of the amount of insulator contamination calculated by the data processing device exceeds a set value.

[0012] When set as V ₁ ~V ₆ in FIG. 2 the history of wind speed at the time of t ₁ ~t ₆ from the start of measurement, contamination amount when the time has passed the first t _1, the coefficient a p Is calculated as ESDD ₁ = p · V ₁ ⁿ · t ₁ ⁿ . It is desirable that n be a number in the range of 1.7 to 3.5.

[0013] fouling amount when the elapsed time following t _2, the moving average of the wind speed in the time _{t 1 + t 2 (V 1} +
V ₂ ) / 2, and ESDD ₂ = p · ((V ₁ + V ₂ )
/ 2) ⁿ · (t ₁ + t ₂ ) ⁿ . Similarly, the amount of fouling when the time t ₃ has elapsed is t ₁ + t ₂ + t
Moving average of wind speed within ₃ hours (V ₁ + V ₂ + V ₃ ) / 3
And using the following equation, ESDD ₃ = p · ((V ₁ + V ₂ + V ₃ ) /
3) It is calculated as ⁿ · (t ₁ + t ₂ + t ₃ ) ⁿ .

The thus estimated ESDD_ThreeIs set
If the fixed value is exceeded, t_ThreeWhen the time has passed
Insulator cleaning is performed by the child cleaning device 5. This allows the insulator
The amount of child contamination becomes 0, then t_FourWhen the time has passed
The calculation of the amount of fouling does not start from the point of time of insulator cleaning.
Still, starting from the above measurement start time, t₁
+ T_Two+ T_Three+ T_FourMoving average (V₁+
V_Two+ V_Three+ V_Four) / 4 and ESDD_Four= P ・
((V₁+ V_Two+ V_Three+ V_Four) / 4)ⁿ・ (T₁+ T_Two
+ T _Three+ T_Four)ⁿ-ESDD_ThreeIs calculated as As well
T_FiveThe amount of contamination when the time of_Five=
p · ((V₁+ V_Two+ V_Three+ V_Four+ V_Five) / 5)ⁿ・
(T₁+ T _Two+ T_Three+ T_Four+ T_Five)ⁿ-ESDD_Threeage
Is calculated.

For reference, ESDD ₁ in the conventional method is used.
ＥＳESDD ₅ is calculated by the following equation. ESDD ₁ = p ・ V ₁ ⁿ・ t ₁ ESDD ₂ = p (V ₁ ⁿ・ t ₁ + V ₂ ⁿ・ t ₂ ) ESDD ₃ = p ・ (V ₁ ⁿ・ t ₁ + V ₂ ⁿ・ t ₂ + V ₃₎
ⁿ · t ₃ ) ESDD ₄ = p · V ₄ ⁿ · t ₄ ESDD ₅ = p · (V ₄ · t ₄ + V ₅ ⁿ · t ₅ )

As described above, in the present invention, the amount of insulator contamination is estimated using the moving average value of the wind speed during a certain period of time from the start of the measurement every fixed time. As shown by the solid line, an estimated curve having the same pattern as the actually measured value can be obtained. Therefore, if the value of the coefficient p is appropriately set by an experiment, an estimated value that is in good agreement with the actually measured value can be obtained. On the other hand, in the conventional method, the pattern of the estimated curve itself is different from the actually measured value, as shown by the broken line in the right diagram of FIG. It is impossible to get an estimate.

If there is rainfall during the measurement time, the contaminants adhering to the insulator surface are washed away. Therefore, when the rainfall is measured by the rain gauge 2, the rainfall and the washing effect obtained in advance are determined. It is preferable to correct the above estimated value by using the relationship. However, this method itself has been known in the past and is not particularly new.

[0018]

As described above, according to the present invention, it is possible to obtain an estimated value which coincides with an actually measured value without using expensive equipment or manpower, and to set a short time interval for performing an operation. Thus, data on the amount of insulator fouling can be obtained almost continuously. For this reason, when a typhoon strikes, etc., there is a great effect in correctly determining the timing for performing insulator cleaning.

[Brief description of the drawings]

FIG. 1 is a block diagram showing an insulator fouling estimation device of the present invention.

FIG. 2 is a history diagram of wind speed in the embodiment.

FIG. 3 is a graph showing measured values on the left and estimated values on the right.

[Explanation of symbols]

1. Anemometer, 2 rain gauge, 3 timer, 4 data processor, 5 insulator cleaning device

Claims (3)

[Claims] 1. A method for estimating the amount of insulator fouling by using a formula of wind speed and time, wherein a moving average value of wind speed during a certain period of time from the start of measurement is used as the wind speed. Insulator contamination estimation method. 2. In estimating the amount of insulator fouling by an expression of wind speed ⁿ × time ⁿ , a moving average value of wind speed during a certain period of time from the start of measurement is used as this wind speed. A method for estimating insulator fouling, wherein a value of 1.7 to 3.5 is used. 3. A wind direction anemometer, a timer capable of measuring an elapsed time from a measurement start time, and a moving average value of a wind speed during a predetermined time from the measurement start time to a wind speed ⁿ × An insulator contamination estimating device comprising: a data processing device for obtaining an amount of insulator contamination by an expression of time ⁿ .