JPH0480644A - Measurement of contamination of insulator - Google Patents

Abstract

PURPOSE:To achieve a higher efficiency of measuring work of contamination along with a higher measuring accuracy by a method wherein a washing water is supplied to an insulator washing tank from a washing water supply source to clean up the inside of the washing tank and the washing water is jetted to wash the surface of the insulator. CONSTITUTION:With a dummy insulator 28 in a closed washing tank 3, when a switch is operated to input a measurement starting signal into a control section 17, a washing water is supplied into an insulator washing tank 3 from a tank 1 to made washing water clean up the inside of the washing tank 3. Then, while an insulator 27 to be measured is moved into the washing tank 3 from an exposure position, the washing water after the cleaning is discharged from the washing tank. Then, the washing water is jetted to the insulator 27 to be measured in the washing tank 3 from the tank 1 for washing water to wash the rear of the insulator 27. Moreover, electric conductivity of the contaminated water after the washing is measured with a conductometer 10. Thereafter, an intrinsic electric conductivity of the washing water of the tank 1 for washing water as measured or set previously is subtracted with an arithmetic controller 16 from the electric conductivity thus obtained. Thus, a salt adhesion density of the insulator 27 to be measured is computed based on the results of the subtraction.

Description

[Detailed Description of the Invention] [Field of Industrial Application] This invention measures the amount of contaminants containing salt, sulfide, sulfate, gypsum, cement, etc. attached to suspended insulators, long-stem insulators, etc. The present invention relates to a method for measuring the amount of contamination of an insulator.

[Conventional technology]

In general, in order to prevent ground faults caused by deterioration of insulation due to salt damage to the support insulators of power transmission lines, it is important to accurately understand the contaminants attached to the insulators as the equivalent salt adhesion density. As a method for measuring the amount of contamination, the insulator to be measured is cleaned using ultrasonic vibration in a cleaning tank filled with water, the conductivity of the contaminated water after cleaning is measured, and the contamination is determined from this conductivity. There was a measurement method that calculated the amount, and a measurement method that used an insulator to be measured with multiple electrodes baked in advance and measured the resistance between the electrodes with the surface evenly moistened to determine the amount of contamination. .

[Problem to be solved by the invention]

However, the former ultrasonic cleaning method requires that the surface of the insulator to be cleaned must be immersed in cleaning water, so it can be applied to measuring the amount of contamination on insulators that are not complex in shape, such as long-stem insulators; There is a problem in that it cannot be applied to measuring the amount of contamination on insulators with complex surface shapes such as insulators.

On the other hand, the latter measurement method takes time to evenly wet the insulator surface, and also has the problem of low measurement accuracy because it converts the surface resistance into the amount of contamination.

The conventional method for measuring the amount of contamination of suspended insulators is as follows:
There was also a method of wiping off the contaminants adhering to the insulator surface with water-impregnated cotton, etc., dissolving the contaminants in a predetermined amount of water, and then measuring the conductivity of the contaminated water to calculate the amount of contamination. This method is troublesome and takes a long time to measure the amount of contamination, and there are problems in that it is dangerous to perform measurement work when rapid contamination occurs due to a typhoon or the like.

The purpose of the present invention is to solve the above-mentioned conventional problems and improve the work efficiency of measuring the amount of contamination. It is an object of the present invention to provide a method for measuring the amount of insulator contamination that can also be applied.

[Means to solve the problem]

In order to achieve the above object, the invention as claimed in claim 1, after cleaning the inside of the insulator washing tank by supplying washing water from the washing water supply source into the insulator washing tank, removes the insulator to be measured from the exposed position into the washing tank. The cleaning water is discharged from the cleaning tank, and the cleaning water is sprayed from the cleaning water supply source onto the insulator to be measured in the cleaning tank to clean the insulator surface. The electrical conductivity of the water is measured, and the specific electrical conductivity of the washing water in the washing water tank, which has been measured or set in advance, is subtracted from the electrical conductivity by the arithmetic and control device, and the salt adhesion density of the insulator to be measured is calculated. method.

Further, the invention according to claim 2 cleans the inside of the washing tank by supplying washing water from the washing water supply source to the inside of the insulator washing tank, and discharges the washing water after cleaning from the washing tank. of cleaning water is supplied into the cleaning tank and the specific conductivity of the cleaning water is measured using the conductivity scale.Then, the insulator to be measured is moved from the exposed position into the cleaning tank, and the cleaning water after measurement is discharged from the cleaning tank. Then, a predetermined amount of cleaning water is sprayed from the cleaning water supply source onto the insulator to be measured in the cleaning tank to clean the insulator surface, and further, the conductivity of the contaminated water after cleaning is measured by the conductivity scale, A calculation and control device subtracts the electrical conductivity specific to the cleaning water from the electrical conductivity obtained after washing the insulator to be measured, and the salt adhesion density of the insulator to be measured is calculated from this subtracted electrical conductivity. There is.

Furthermore, the invention according to claim 3 provides the method for measuring the amount of soiling of an insulator according to claim 1 or 2, in which the conductivity of the contaminated water after washing the insulator to be measured is measured, and then the contaminated water is discharged from the insulator cleaning tank. , a method is used in which cleaning water is supplied from a cleaning water supply source into the insulator cleaning tank to clean the inside of the cleaning tank.

[For production]

The invention according to claim 1 supplies cleaning water from the cleaning water supply source to the insulator cleaning tank to clean the inside of the cleaning tank, so that residual contaminants adhering to the inside of the cleaning tank are removed. The accuracy of measuring the amount of contamination on the insulator to be measured is improved. In addition, the electrical conductivity specific to the cleaning water measured or set in advance is subtracted from the electrical conductivity of the contaminated water used to clean the insulator surface of the insulator to be measured, and the amount of contamination is calculated based on this subtraction result. The accuracy of measuring the amount of contamination on the insulator is improved.

Furthermore, the invention according to claim 2 supplies a predetermined amount of cleaning water into the cleaning tank and measures the specific conductivity of the cleaning water based on the conductivity, so that the measurement accuracy is improved compared to the invention according to claim 1. .

Furthermore, the invention according to claim 3 provides that after measuring the conductivity of contaminated water after cleaning the insulator to be measured, the contaminated water is discharged from the insulator cleaning tank, and cleaning water is supplied from the cleaning water supply source into the insulator cleaning tank. Since the inside of the cleaning tank is washed and cleaned, the amount of contaminants adhering to and remaining in the cleaning tank can be reduced, and the accuracy of measuring the amount of contamination next time can be improved.

〔Example〕

Hereinafter, a contamination amount measuring device used in the insulator contamination amount measuring method according to the first aspect of the invention will be explained based on FIG.

As shown in FIG. 2, the cleaning water tank 1 has a water supply pipe 2.
An insulator cleaning tank 3 is connected thereto, and a water supply pump 4 and a normally closed solenoid valve SVI are connected in the middle of the water supply pipe 2. Further, first and second bypass pipes 5 and 6 are connected to the pump 4, a manual valve V is connected to the first bypass pipe 5, and a normally open type valve V is connected to the second bypass pipe 6. Solenoid valve SV2 is connected. And solenoid valve SV]
When the pump 4 is started with the tank 1 closed, the cleaning water in the cleaning water tank 1 passes from the water supply pipe 2 through the second bypass pipe 6 and the solenoid valve S V 2 to the tank 1.
will be returned to. At this time, by adjusting the opening amount of the manual valve V, the water pressure of the cleaning water is adjusted while the pump 4 is rotating at a constant speed, and the pump 4 is operated for a predetermined time (at a predetermined rotation speed) with the solenoid valve SVI open. ) The amount of cleaning water supplied when rotating is adjusted.

In the cleaning tank 3, spray nozzles 7 are arranged at appropriate locations for spraying cleaning water at a predetermined pressure onto the surfaces of the dummy insulators 28 and the insulators to be measured 27 to clean dirt on the surfaces of the insulators.

A conductivity meter 10 is provided in the cleaning tank 3 to measure the conductivity of the cleaning water stored in the cleaning tank 3. Further, a drainage pipe line 14 is connected to the lower surface of the cleaning tank 3, and a drainage solenoid valve SV3 is connected in the middle of the pipe line 14.

The arithmetic and control unit 1 is connected to the conductivity meter 10 by the tong line 15.
6. This arithmetic and control device 16 is a control section 1
7 and an arithmetic unit 18, the control unit 17 includes:
An operation signal is output to the pump 4, the electromagnetic valves SVI to SV3, and the elevating mechanism 24 for the insulators to be measured 26 and 27, which will be described next. In addition, the calculation unit 18 includes a conductivity meter 10.
It is possible to calculate the salt adhesion density of the insulator based on the electrical conductivity output from the insulator.

At the lower end of the support rod 25 of the insulator lifting mechanism 24, two sets of insulators to be measured 26, 27 and - dummy insulators 28 are supported so as to be movable up and down. And always dummy insulator 28
The outer periphery of the cleaning tank 3 is installed in such a manner that it is in contact with the upper inner peripheral surface of the cleaning tank 3. In addition, when measuring the amount of contamination of the insulator to be measured 27, for example, among the insulators to be measured 26 and 27, the support rod 25 is lowered to remove the insulator to be measured 2 while the cleaning tank 3 is divided into two parts.
7 is lowered to a predetermined position in the cleaning tank 3, the cleaning tank 3 is moved again.
With the outer periphery of the insulator 27 to be measured sealed, a predetermined amount of cleaning water is sprayed from the spray nozzle 7 onto the back surface of the insulator 27 to be measured to clean the dirt.

Also, when cleaning the inside of the cleaning tank 3, use the dummy insulator 2.
Cleaning water is jetted from the injection nozzle 7 while the outer peripheral edge of the dummy insulator 8 is in contact with the inner peripheral edge of the cleaning tank 3, and the back surface of the dummy insulator 28, the inner peripheral surface of the cleaning tank 3, etc. are cleaned with the cleaning water.

Next, a measuring method according to a first embodiment of the invention according to claim 1 will be explained using the above-mentioned insulator stain amount measuring device.

In the measurement method of this first embodiment, it is assumed that the control device 16 stores in advance the specific conductivity R1 of the cleaning water.

As shown in FIG. 2, when a measurement start signal is input from a switch (not shown) to the control unit 17 with the dummy insulator 28 or the cleaning tank 3 closed, the cleaning water tank Cleaning water is supplied into the insulator cleaning tank 3 from scratch to clean the inside of the cleaning tank 3. Next, in step S2, with the insulator to be measured 27 moved from the exposed position into the cleaning tank 3, in step S3, the cleaning water after cleaning is discharged from the cleaning tank 3, and then, in step S4, Cleaning water is injected from the cleaning water tank 1 onto the insulator 27 to be measured in the cleaning tank 3 to clean the back surface of the insulator 27. Furthermore, in step S5, the conductivity R2 of the contaminated water after cleaning is determined by the conductivity value lO. In step S6, the specific conductivity R1 of the wash water in the wash water tank 1, which has been measured or set in advance, is subtracted from the conductivity R2 by the arithmetic and control unit 16, and in step S7, the subtractive conductivity R1 is subtracted from the conductivity R2. The salt adhesion density of the insulator 27 to be measured is calculated based on the degree.

Further, after the step S5 is completed, the insulator to be measured 27 is moved from the measurement position to the exposure position in step S8, and the dummy insulator 28 corresponds to the cleaning tank 3 as shown in FIG.
Return to initial state.

In this embodiment, since the cleaning water is supplied from the cleaning water tank 1 to the insulator cleaning tank 3 to clean the inside of the cleaning tank 3, the inside of the insulator cleaning tank 3 is cleaned during the previous measurement. The measurement accuracy can be improved by removing contaminants.

Further, in the above embodiment, the specific conductivity R1 of the cleaning water measured or set in advance is subtracted from the conductivity R2 of the contaminated water,
Since the salt adhesion density of the insulator 27 to be measured is calculated based on this subtraction type conductivity, it is possible to improve the measurement accuracy of the amount of contamination.

Furthermore, since the back side of the insulator is cleaned with washing water to remove contaminants, measurement work can be carried out quickly, and it can also be applied to measuring the amount of contamination on insulators with complex shapes such as suspended insulators. You can also do that.

Next, claim 2 is obtained using a measuring device substantially similar to that shown in FIG.
A method for measuring the amount of contamination of an insulator according to a second embodiment of the invention will be explained with reference to FIG.

The measuring method of this second embodiment is compared with the measuring method of the first embodiment described above in step Sl in FIG.

82, S3. S4. S5. S7. S8 is the same as in FIG. 1, except for the following points. That is, step 8 in FIG.
As shown in 2a and S2b, the specific conductivity R1a of the cleaning water
is actually measured by supplying a predetermined amount of cleaning water into the insulator cleaning tank 3 and measuring the electrical conductivity, and in step S2b, the cleaning water is discharged from the cleaning tank 3 and the process moves to step S4, and in step S6, Measurement type conductivity R of contaminated water
The actually measured specific conductivity R1a of the cleaning water is subtracted from 2, and the amount of contamination of the insulator is calculated based on this subtracted conductivity. Therefore, the measuring method of the second embodiment can further improve measurement accuracy compared to the measuring method of the first embodiment.

Next, a measuring device for carrying out the measuring method of the third embodiment embodying the invention as claimed in claim 2 will be explained with reference to FIGS. 4 and 5.

A measurement tank 9 is connected to the cleaning tank 3 via a pipe line 8. This measuring tank 9 is provided with an electrical conductivity indicator 10, so that the electrical conductivity of the wash water stored in the tank 9 can be measured.

Further, a stirring blade 11 for stirring the cleaning water is housed inside the measurement tank 9, and the blade 11 is connected to a motor 12.
It is attached to the rotating shaft 13 of. Furthermore, a drainage pipe line 14 is connected to the lower surface of the measurement tank 9, and a drainage solenoid valve SV3 is connected in the middle of the pipe line 14.

The conductivity gauge 10 is connected to an arithmetic and control unit 16 via a lead wire 15.
It is connected to the. Control unit 17 of this arithmetic and control device 16
outputs operating signals to the pump 4, the electromagnetic valves SVI to SV3, the motor 12 of the stirring blade 11, the lifting mechanism 24 of the insulators 26 and 27 to be measured, and the like.

Further, in this embodiment, the long pipes 2 and 8 are used to mount the cleaning tank 3 alone on the steel tower, for example.

Next, the measuring method of the third embodiment will be explained in detail with reference to FIG. 6.

When the dummy insulator 28 closes the cleaning tank 3 as shown in FIG. 4, when a measurement start signal is input from the switch (not shown) to the control unit 17 in FIG. Pump 4 is started and step S
2, the solenoid valve SV3 is opened, and then in step S
In step 3, the remaining water in the measuring tank 9 is discharged, and in step 4, the solenoid valve SV3 is closed.

Next, in step S5, the solenoid valve SVI is opened and the solenoid valve SV2 is closed, and the cleaning water in the cleaning water tank 1 is passed through the water supply pipe 2 by the pump 4 to the cleaning tank 3.
The back surface of the dummy insulator 28 and the inner circumferential surface of the cleaning tank 3 are cleaned, and the cleaning water is also supplied into the measurement tank 9 through the pipe line 8, and the cleaning water is supplied to the measurement tank 9 through the pipe line 8. The inside of the storage tank 9 is cleaned. (Step S6) Then, in step S7, the solenoid valve SVI is closed and the solenoid valve SV2 is opened, and in step S8, the motor 12 is energized and the stirring blade 11 is rotated. As a result, the cleaning water in the measurement tank 9 is stirred within the tank, so that the inside of the tank 9 is efficiently cleaned.

Next, the solenoid valve SV3 is opened in step S9, and the cleaning water in the measurement tank 9 is discharged in step S10. In step S11, the solenoid valves SV2 and SV3 are closed, and the solenoid valve SVI is opened, so that the pump 4
A predetermined amount of cleaning water is supplied into the cleaning tank 3. This cleaning water passes from the cleaning tank 3 through a pipe line 8 and is stored in a measurement tank 9. (Step 512) Next, in step S13, the solenoid valve Svl is closed and S V 2 is opened, and then in step S1
At step 4, the stirring blade 11 is rotated, and the stored cleaning water is stirred in the measurement tank. Then, in step S15, the specific conductivity R1a of the cleaning water is measured by the conductivity meter 10.

Next, in step S16, the cleaning tank 3 is separated into two, and the insulator lifting mechanism 24 is operated to move the insulator 27 to be measured into the cleaning tank 3, and then the cleaning tank 3 is combined. 3 is brought into close contact with the outer peripheral edge of the insulator 27 to be measured.

In step S17, the solenoid valve SV3 is opened, and in step S
At step 18, the cleaning water in the measuring tank 9 is discharged. Then, in step S19, the solenoid valves SV2 and SV3 are closed, and the solenoid valve SV1 is opened, and in step S20, the back surface of the insulator to be measured 27 is cleaned with a predetermined amount of cleaning water. Thereafter, in step S21, solenoid valve SVI is closed and SV2 is opened, and in step S22, stirring blade 11 is rotated to stir the cleaning water in measurement tank 9. After that, in step S23, the conductivity meter 10
The conductivity R2 of the soiled cleaning water is measured.

Next, in step S24, after subtracting the specific conductivity R1a of the cleaning water from the conductivity R2 by the calculation unit 18,
In step S25, the calculation unit 18 calculates the amount of contamination based on the subtraction result, and further in step S82
6, the pump 4 is stopped, and the insulator 27 to be measured is moved to the exposed position in step S27, and the dummy insulator 28 closes the opening of the cleaning tank 3.

Now, in the measurement method of this third embodiment, prior to measuring the amount of contamination on the insulator 27 to be measured, cleaning work of the cleaning tank 3, long pipes 2, 8, measurement tank 9, etc. is performed using cleaning water. Therefore, the accuracy of measuring the amount of contamination can be improved.

In addition, in this third embodiment, the specific conductivity R of the cleaning water is
1a, and after subtracting the electrical conductivity R1a from the electrical conductivity R2 of the soiled washing water after washing the insulator 27 to be measured,
Since the amount of contamination of the insulator 27 to be measured is calculated from the result of this subtraction, the measurement accuracy of the amount of contamination can be improved.

Next, a fourth embodiment that embodies the invention set forth in claim 3 will be described with reference to FIG.

In the measuring method of this fourth embodiment, after step 25 in FIG. 6, as shown in FIG. This is done as cleaning process B.

In the case of this fourth embodiment, before the contaminants generated by cleaning the insulator 27 to be measured dry and adhere to the cleaning tank 3, the pipes 2 and 8, and the measurement tank 9, the measurement tank 9 is cleaned. Therefore, the amount of contaminants that adhere to and remain in the pipes 2, 8, cleaning tank 3, and measurement tank 9 during the next measurement of the amount of contamination can be further reduced. Therefore, measurement accuracy can be further improved.

In the first to third embodiments, the cleaning water after cleaning is discharged after the insulator 27 to be measured is moved from the exposed position into the cleaning tank 3, so if both steps are reversed, compared,
Even if rainwater or the like enters the cleaning tank 3 during movement of the insulator 27 to be measured, it is preferably discharged before the measurement process.

In addition, in the first to fourth embodiments, if the cleaning water measured at the end of the measurement is stored, the conductivity meter 10 will dry and deteriorate its performance, or the contaminated water will dry and become contaminated. This is more preferable since it can prevent objects from sticking together.

By the way, FIG. 8 is a graph showing the relationship between the amount of water discharged and the rate of change in the amount of measured contamination. As is clear from this graph,
If the amount of washing water is set to 400 cC or more, the rate of change in the amount of contamination will be within 10%, and the difference between the case where the pre-cleaning and cleaning process A from steps S1 to 88 is performed and the case where the pre-cleaning and cleaning process A is performed
and a case where post-cleaning and cleaning step B is performed. When both cleaning steps A and B are performed as shown in this graph, the detection accuracy can be improved to a very high rate of change in the amount of contamination of 96% when the amount of water is 400 cc.

Furthermore, FIG. 9 is a graph showing the relationship between the length of the pipe 8 and the amount of recovered water when using 400 cC cleaning water containing salt and tonoko (contamination amount 0.0965+ng/c). be. As is clear from this graph, the longer the length of the pipes 2 and 8, the lower the amount of water recovered. For example, the circle mark indicates the amount of water recovered after 180 seconds, and the mark . indicates the amount of water recovered after 60 seconds. It is something. Therefore, conduit 8 or, for example, 2
Even when it is long like 0m, the time is long 18
If it is after 0 seconds, almost all of it will be recovered.

Note that the present invention is not limited to the above-mentioned embodiments; for example, by installing a lid that opens and closes the upper opening of the cleaning tank 3, the lid is closed during the cleaning and cleaning process;
When measuring the amount of contamination on the insulator to be measured, the lid may be opened and the insulator to be measured may be housed in the cleaning tank 3.

Further, in FIGS. 2 and 4, the number of insulators to be measured 26 and 27 is two, but it may be one or three or more.

〔Effect of the invention〕

As described in detail above, the invention according to claim 1 can improve the accuracy of measuring the amount of contamination of the insulator to be measured by cleaning and discharging the contaminants adhering to the inside of the insulator with cleaning water in advance. At the same time, the efficiency of the measurement work has been improved, and the amount of contamination is calculated by subtracting the specific conductivity of the cleaning water, which has been measured in advance, from the conductivity of the contaminated water after cleaning the insulator to be measured. This has the effect of improving the measurement accuracy of the amount of contamination.

Further, since the invention according to claim 2 actually measures the electrical conductivity specific to the cleaning water, it is possible to improve the measurement accuracy of the amount of contamination more than the invention according to claim 1.

Furthermore, since the invention according to claim 3 performs post-cleaning, there is an effect that the measurement accuracy of the amount of contamination can be further improved compared to the invention according to claim 1 or 2.

[Brief explanation of drawings]

FIG. 1 is a flowchart for explaining the first embodiment of the method for measuring the amount of insulator contamination according to the present invention, FIG. 2 is a front view showing an apparatus for measuring the amount of insulator contamination, and FIG. Flowchart for explanation; FIG. 4 is a front view of the road body showing a separate device for measuring the amount of insulator fouling; FIG. 5 is a block circuit diagram of the measuring device; FIG. 6 is a third diagram of the method for measuring the amount of insulator fouling
Flowchart for explaining the embodiment, FIG. 7 is a flowchart for explaining the fourth embodiment of the method for measuring the amount of contamination on an insulator, and FIG. 8 is a graph showing the relationship between the amount of washing water discharged and the rate of change in the amount of contamination. , FIG. 9 is a graph showing the relationship between the length of the pipeline and the amount of recovered water. 1...Washing water tank, 2...Water supply pipe, 3...
Cleaning tank, 4... Water supply pump, 7... Injection nozzle, 8
...Pipe line, 9...Measuring tank, 10...Conductivity meter, 16...Control device, 17...Control unit, 18...
- Arithmetic unit, 24... Insulator lifting mechanism, 26.27...
Insulators to be measured, SV1 to SV3...Solenoid valves. Patent applicant Tokyo Electric Power Company Nippon Insulator Co., Ltd. Agent Patent attorney On 1) Hironobu (and 1 other person) Figure 2

Claims (1)

[Claims] 1. After cleaning the inside of the cleaning tank by supplying cleaning water from the cleaning water supply source into the insulator cleaning tank, move the insulator to be measured from the exposed position into the cleaning tank, and perform the cleaning after cleaning. The water is discharged from the cleaning tank, and then cleaning water is sprayed from the cleaning water supply source onto the insulator to be measured in the cleaning tank to clean the insulator surface, and the conductivity of the contaminated water after cleaning is measured using a conductivity meter. is measured, and the specific conductivity of the wash water in the wash water tank, which has been measured or set in advance, is subtracted from the conductivity by the arithmetic and control device to calculate the salt adhesion density of the insulator to be measured. Method for measuring the amount of insulator contamination. 2. Supply cleaning water from the cleaning water supply source into the insulator cleaning tank to clean the inside of the cleaning tank, drain the cleaning water from the cleaning tank, and then pour a predetermined amount of cleaning water into the cleaning tank. The specific conductivity of the cleaning water is measured using a conductivity meter, and then the insulator to be measured is moved from the exposure position into the cleaning tank, the cleaning water is discharged, and then the cleaning water is removed from the cleaning water supply source. A predetermined amount of cleaning water is sprayed onto the insulator to be measured in the cleaning tank to clean the insulator surface, and the conductivity of the contaminated water after cleaning is measured using a conductivity meter. subtracting the electrical conductivity specific to the washing water from the electrical conductivity obtained by using an arithmetic control device;
A method for measuring the amount of contamination of an insulator, characterized in that the salt adhesion density of the insulator to be measured is calculated from the subtracted electrical conductivity. 3. After measuring the conductivity of contaminated water after cleaning the insulator to be measured, drain the contaminated water from the insulator cleaning tank and supply cleaning water from the cleaning water supply source to the insulator cleaning tank to clean the inside of the cleaning tank. The method for measuring the amount of insulator staining according to claim 1 or 2, characterized in that: