KR101085004B1 - Automatic voltage regulator - Google Patents

Abstract

PURPOSE: An inspection method of an automatic voltage controller is provided to collect a specimen of insulating oil, thereby inspecting equipment by test analyzing under-oil gas and pollution of the insulating oil. CONSTITUTION: Oxygen and nitrogen in the inside of a specimen container is eliminated by injecting argon gas in the inside of the specimen container(S1). A tap position indicator of an automatic voltage controller is set to zero. An insulating oil is collected in the specimen container through an oil discharge valve and closely sealed after finish collecting in order to avoid the contact with the atmosphere. A label is attached in the specimen container after collecting the insulating oil(S2). An abnormality in equipment is determined through a check with human eyes in oil leakage part(S3). The deterioration of the insulating oil is measured(S4). A gas in the insulating oil is analyzed(S5).

Description

Checking method of automatic voltage regulator {Automatic Voltage Regulator}

The present invention relates to an automatic voltage regulator, and more particularly, it will be described collectively as a pole mounted automatic voltage regulator (PVR) and a line type automatic voltage regulator (SVR) (hereinafter, referred to as a "pillar mounted automatic voltage regulator"). It is about the inspection method of the automatic voltage regulator.

In general, an automatic voltage regulator is installed at a system end of a wiring line such as an island or a mountainous region to automatically adjust the voltage fluctuation caused by the line resistance of the wiring line for each phase to maintain a constant voltage at all times.

Such automatic voltage regulators are roughly classified into columnar type automatic voltage regulators installed on the column and line type automatic voltage regulators installed on the line. Hereinafter, the automatic voltage regulators will be described collectively as column type automatic voltage regulators.

These automatic voltage regulators have been continuously expanded as the electricity consumption increases with industrial development. As these expanded voltage regulators have been in use for a long time, the aging of them has been remarkable now. Especially, stable power supply is an important requirement due to the recent automation and advancement of industrial facilities. The management of old power equipment is very important in terms of preventing economic losses and industrial safety accidents that may occur.

Power equipment such as automatic voltage regulators are generally expensive and large in size, so the replacement cost is very high and requires a long time and a lot of manpower for operation. In addition, since most facilities are individually designed and manufactured for each application, many years of unplanned progress can result in huge losses due to production disruptions. It reaches a threatening level.

Recently, the consumption of electricity is increasing rapidly due to the increase of cooling loads and electric information processing facilities and convenience facilities such as computers, and this phenomenon is indicated by the expansion of the overload area and the increased load bias area. As a result, the load of the columnar and line type automatic voltage regulators located at the end of the system increases irregularly, and the automatic voltage regulators frequently cause dielectric breakdown due to deterioration due to overload and external environment.

Such automatic voltage regulators play an important role in the stable supply of power and require higher reliability than any other power installation. Insulation breakdown of the insulating oil that cools the automatic voltage regulator may cause burnout of the automatic voltage regulator.

The main causes of burnout of the automatic voltage regulator due to the breakdown of insulation are that when the temperature difference between the inside and outside of the voltage regulator occurs, moisture is generated inside the voltage regulator, and the moisture is contained in the insulating oil or the viscosity of the insulating oil increases due to long-term use. It is shown that the cooling efficiency is greatly reduced or due to carbon, impurities, etc. generated during use.

Therefore, in order to prevent burnout of the voltage regulator due to the breakdown of the conventional automatic voltage regulator, it is necessary to remove moisture, carbon, and impurities generated during use, and to filter the insulating oil. However, the inspection of the insulating oil was not performed efficiently. .

In addition, since the conventional device does not measure the voltage and current load, check whether the connection cable is overheated, and check the low voltage side connection bus terminal, there is a problem in that it is not possible to effectively determine whether an overall automatic voltage regulator is abnormal.

Accordingly, the present invention has been made to solve the problems described above, by taking a sample of the insulating oil used in the automatic voltage regulator to test and analyze the contamination of the insulating oil and gas in the oil and at the same time check the equipment to adjust the automatic voltage regulator Its purpose is to provide an inspection method for an automatic voltage regulator that can be used safely.

The above-mentioned object is to check the automatic voltage regulator installed at the system end of the wiring line to maintain a constant voltage. The automatic voltage regulator is connected to the automatic voltage regulator through a drain valve with the tap position indicator of the automatic voltage regulator set to "0". Sampling step of collecting the insulating oil to be used in the sample container so that there is no contact with the atmosphere, then tightly sealed and attached with a label; After sampling the insulating oil, measure the secondary voltage current load of the automatic voltage regulator, the elbow connection member and connection cable of the high voltage side, the infrared temperature measurement according to the low pressure side connection bus terminal and cable overheating, and from the base to the ground terminal of the voltage regulator. Ground resistance measurement of connected ground wire, BAY-O-NET-FUSE, high pressure side bushing flange, elbow connector and bushing well insert, tap changer, low pressure side oil gauge, oil thermometer, secondary side bushing enclosure, etc. Checking the device to determine whether there is a problem with the device; Moisture test to quantify trace moisture in the sample collected, dielectric breakdown voltage test to measure the fall of dielectric breakdown voltage by impurities such as moisture, dust, dielectric particles in dielectric oil, and measurement of degradation of dielectric oil through computerized value test Insulating oil degradation measurement step; And a step of analyzing the dissolved gas in the insulating oil to determine the type, the location, and the degree of the failure by investigating the dissolved gas component, the amount of generation, the secular variation, etc. contained in the insulating oil. Is achieved by the method.

And a pretreatment step of injecting argon gas into the sample container before removing the sample to remove oxygen and nitrogen inside the container and collecting insulating oil of the automatic voltage regulator.

According to the inspection method of the automatic voltage regulator of the present invention, the insulating oil used in the automatic voltage regulator can be checked efficiently, and at the same time, the device can be safely used.

1 is a circuit diagram illustrating an automatic voltage regulator installed at a system end of a general line.
2 is a diagram illustrating a general automatic voltage regulator.
3 is a diagram illustrating a controller configured in the automatic voltage regulator of FIG. 2.
4 is a block diagram showing a method of checking an automatic voltage regulator according to the present invention.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

1 to 4 are diagrams showing a circuit, a configuration, an inspection method, and the like of an automatic voltage regulator according to the present invention.

The automatic voltage regulator 10 according to the present invention is installed at the terminal end of a wiring line such as an island or a mountainous region to automatically adjust the voltage fluctuation caused by the line resistance of the wiring line for each phase to maintain a constant voltage at all times. As shown in FIG. 1, one unit is installed in each phase.

Thus, when installing the columnar type automatic voltage regulator (hereinafter referred to as "automatic voltage regulator") 10, first, the bypass-pass switch 1 and the automatic voltage regulator PVR in FIG. Since the automatic voltage regulator 10 may be damaged when the switch 2 is simultaneously turned on (switched on), the switch for automatic voltage regulator 2 must be opened after the bypass switch 1 is opened (switched off) after a power failure. Turn on (switch on).

If the bypass switch 1 is turned on (switched on) in order to prevent power failure, to turn on (switch on) the automatic voltage regulator switch 2, the tap position indicator 13 of FIG. With the position "0", the automatic / manual selection switch 22 is set to manual, and the automatic voltage regulator switch 2 is turned on (switched on). After that, the bypass switch 1 must be opened (switched off). In particular, when the automatic voltage regulator switchgear 2 is turned on (switched on), the tap position indicator 13 must be in a state of "0", which means that the position of the tap position indicator 13 is "0". This is because the automatic voltage regulator 10 may explode at a position other than the current voltage difference.

Then, the automatic / manual selection switch 22 is switched to the automatic position, and after a while, it is checked whether the needle of the tap position indicator 13 changes to the normal operation state.

Meanwhile, as shown in FIG. 2, the automatic voltage regulator 10 installed as described above is formed in a sealed container filled with insulating oil therein, and a plurality of radiators having a plurality of radiating fins on an outer surface thereof. (11), the tap position indicator 13, the oil level gauge 14, the oil drain valve 12, the control part 20, etc. are comprised.

The radiator 11 is attached to the outer surface of the automatic voltage regulator 10 in the vertical length direction to radiate heat generated by the automatic voltage regulator 10 to increase the mechanical strength of the automatic voltage regulator 10.

The tap position indicator 13 is installed on the outer upper portion of the automatic voltage regulator 10 so that the present position of the tab configured in the automatic voltage regulator 10 can be visually checked, so that the voltage drop rate and the overload capacity of the line can be easily known. Will be.

The oil level gauge 14 is installed on the outer upper portion of the automatic voltage regulator 10 adjacent to the tap position indicator 13 so that the indicator can easily visually check the level and color of the insulating oil charged in the automatic voltage regulator 10. to be.

The oil drain valve 12 is installed on the outer lower end of the automatic voltage regulator 10 so that the sample of the insulating oil can be easily collected.

The control unit 20 is installed in the central portion of the outer surface of the automatic voltage regulator 10, the internal exchange is easy and can automatically adjust the voltage, it is easy to know the current voltage, various information of the system.

In addition, as shown in FIG. 3, the control unit 20 includes a neutral voltage indicator 21, an automatic / manual selection switch 22, a tap up / down switch 23, an internal / external power selection switch ( 24) and the like.

Since the neutral voltage indicator 21 lights only when the position of the tap is at the origin, that is, "0", the operator can recognize that the position of the tap is "0" through whether the neutral voltage indicator 21 is lit. Will be.

The automatic / manual selection switch 22 is a switch for selecting a tap operation method, and the upper part of Auto (Remote) is in a state where the tap is automatically adjusted. Will be maintained. And, the lower manual (Manual) can manually adjust the position of the tap, the central Off (Off) is a state in which the tap changer does not operate automatically or manually.

The tap up / down switch 23 is a switch capable of manually raising or lowering the position of the tap when the auto / manual selection switch 22 is manually selected.

The internal / external power selection switch 24 is a switch for selecting a power supply method of the controller, and the internal internal power supply of the upper part uses a system power supply (line voltage) as a power supply for the controller. It is not necessary. At this time, the V1 (V6) switch on the rear panel should be closed and CT switch should be off. This state is maintained during normal operation. In addition, the lower external power source (External) applies a separate external power source AC 120V to the external power terminal to be used as a power source for the controller. At this time, the V1 (V6) switch of the rear panel should be separated and the CT switch should be closed. Although no external power source is used in the field, it is necessary to pay attention to the polarity in case of use.

On the other hand, the inspection method of the automatic voltage regulator configured as described above, as shown in FIG. (S4), the inspection is completed while the dissolved gas analysis step (S5) in the insulating oil, the inspected insulating oil is purified through the purification step (S6).

Pretreatment step (S1) of the sample vessel

Since the sample container for collecting the insulating oil from the automatic voltage regulator 10 is in contact with the atmosphere at the same time as the lid is opened, oxygen and nitrogen in the atmosphere enter the sample container. Since oxygen and nitrogen in the air are dissolved in the insulating oil collected in the sample container, it is difficult to accurately check the sample (insulating oil). Therefore, oxygen and nitrogen in the sample container must be removed before sampling.

Therefore, before the insulating oil of the automatic voltage regulator 10 is collected, argon gas is injected into the sample container, and oxygen and nitrogen in the atmosphere that have entered the sample container are pushed out to remove the oxygen and nitrogen from the sample container. As soon as it is removed, the insulating oil of the automatic voltage regulator 10 is collected.

Then, as the insulating oil is collected into the sample container, the argon gas filling the sample container is discharged to the outside by the volume of the insulating oil filled into the sample container, thereby avoiding contact between the insulating oil filled into the sample container and the atmosphere.

Of course, after the sample is taken, fill the lid quickly with the sample container to avoid contact with the atmosphere.

Insulating oil sampling step (S2)

The insulating oil used in the automatic voltage regulator 10 is collected in a separate sample container and used as a sample for quality test. The sample is tightly sealed so that the sample does not come into contact with the atmosphere. Carry on attached.

1) Sample for quality test

When insulating oil is collected from the inflow equipment, take the following method according to the electrical insulating oil test method (KS C 2101-1995) 4.7.

When sampling oil in use, care must be taken to ensure safety.

Sample containers should be easy to clean, such as glass bottles and cans, and do not affect the properties of the oil. The lid shall not be contaminated with the sample.

Pay attention to the contamination of samples by outside air, and avoid collection whenever possible, especially in bad weather.

When taking samples by opening or closing the cock or valve, there is a risk of disaster such as oil leakage due to failure.

Care shall be taken not to damage the sealed inlet electrical appliances and inlet cables.

In order to prevent the sample from being changed, attach the prepared label on site and transport it.

2) Dissolved gas analysis sample

Insulating oil shall be collected from the automatic voltage regulator 10 in operation, and should be taken in consideration of the sampling method for quality test and the following sampling method.

Insulating oil is taken from the oil drain valve 12 at the bottom of the automatic voltage regulator 10 to be a representative sample. This is because the pyrolysis gas generated at the abnormal part inside the automatic voltage regulator 10 is bubble-shaped and diffused and dissolved in the insulating oil while moving upward to the tank, so that the distribution state of the gas is uniform by forced or natural circulation of the insulating oil. . Sampling is most important for accurate state diagnosis of the automatic voltage regulator 10.

Meanwhile, before the sample, that is, the insulating oil, is collected from the automatic voltage regulator 10, the automatic / manual selection switch 22 is set to the manual position in the control unit 20 of the automatic voltage regulator 10, and the tap up / down switch 23 ), Adjust the needle of the tap position indicator 13 to the "0" (center) position. Of course, it must be checked whether the neutral voltage indicator 21 is lit.

Then, while adjusting the needle of the tap position indicator 13 to "0", loosen the end cover of the oil drain valve 12 and wipe the end of it cleanly, then connect the rubber stopper adapter (adaptor) to the oil supply line Remove 1 liter of insulating oil from the container, clean the container with the extracted oil, and make sure that the tip of the adapter conduit touches the bottom of the sample container. In this process, the pretreatment step of the sample container described above is performed.

Open the drain valve 12 slowly and push the adapter firmly so that no bubbles are generated.Then, overflow the sample over about 300ml sample container (aluminum can or glass bottle container) and gently tap the corner of the container to drain the remaining air. Pull it out slowly (when bubbles form in the conduit, tighten the adapter and open the drain valve (12) a little more).

After filling, cover the sample container with the inner lid of the sample container so that it does not come into contact with the atmosphere, and close it with the outer lid to prevent the inner lid from being damaged.

In order to prevent the sample from being changed, attach the prepared label on site and transport it.

Instrument check step (S3)

When the sampling of the insulating oil is completed, the voltage and current load measurement of the automatic voltage regulator 10, the infrared temperature measurement, the ground resistance measurement, and the oil leakage site are visually inspected to determine whether there is a problem with the apparatus.

1) Voltage and current load measurement

The secondary load voltage and current of the automatic voltage regulator 10 in operation are measured by using a measuring device such as a hook on meter and a multi taster.

3Φ measures the voltage and current of the low voltage terminals X1, X2, X3, XO, 1Φ measures the voltage and current of the low voltage terminals X1, X2, X3, and KEPCO's underground distributor operation manual (ground transformer). Chapter 3 Measurements on Control Guidelines (PAGE 194–195) Calculate the load imbalance and load rate in the measurements and measures and record the measurement time.

The load unbalance rate is calculated according to the following formula, and corrective action is taken in the case of more than 40% of single-phase three-wire and 30% of three-phase four-wire.

2) infrared temperature measurement

Whether the high pressure side elbow connection material and the connection cable are overheated by using an infrared temperature measuring device, the temperature of the low pressure connection terminal terminal contact point and the cable is measured for each phase, and the temperature is recorded.

3) Earth resistance measurement

Using a hook-on ground resistance meter, measure the ground resistance of the ground wire connected to the ground terminal of the automatic voltage regulator 10 from underneath the base plate.

During the measurement, pay attention to the energization state of the secondary booth side and record whether the ground wire is electrowired and the ground resistance value.

Earth resistance should be kept below the specified value (10Ω) and should be carried out in winter as much as possible and avoided in case of cloudy weather and wet ground.

4) Visual inspection of leaky part

Leakage part inspection point

Visual inspection of BAY-O-NET-FUSE, high pressure side bushing flange, elbow connector and bushing well insert, tap changer, low pressure side gauge, oil thermometer, secondary side bushing enclosure, etc. Record it out.

Insulation oil Degradation Measurement  step( S4 )

The collected sample is tested for moisture, dielectric breakdown voltage test to determine the presence of impurities such as moisture and dust in the insulating oil, and the computational value is tested to determine whether the insulating oil is deteriorated.

1) Moisture Test

The trace moisture test is performed by taking a sample with a syringe and using a dose titration method or an electricity titration method. If moisture is present in the insulating oil of the automatic voltage regulator 10, the breakdown voltage decreases and promotes deterioration of the insulating oil and the insulating paper, thereby quantifying a small amount of moisture to be used as a safe operation data of the automatic voltage regulator 10.

Analytical Methods (using Mettler DL37 KF Coulometer)

-Electrical insulating oil test method (KS C 2101-1995) 20. Follow the water test and use the measuring instrument and the designated reagent.

-Quantitative method

Electricity titration method: A sample is added to a pyridine and methyl alcohol mixed solvent mainly composed of iodide ions and sulfur dioxide, and iodine generated by electrolysis is reacted with water to determine the amount of water (ug) from the electric quantity. The principle can be explained as follows.

Iodide ions in the mixed solution are oxidized at the anode to become iodine.

[2I + 2e → I ₂ ]

The amount of iodine generated is proportional to the amount of electricity (C) consumed for electrolysis, and based on Faraday's law, 1 mol of iodine is generated by the amount of electricity of 96487 x 2C (current (A) x time (S)). The iodine generated reacts with the water in the sample and the chemical equation shown below, like iodine in Karl Fischer reagent.

Since 1 mol of iodine reacts with 1 mg of water, the iodine required to react with 1 mg of water is generated by an electric charge of 96487 x 2/18000 = 10.71 (C).

Therefore, by measuring the amount of electricity consumed to the appropriate end point, the amount of water can be determined.

The amount of electricity can be obtained by integrating the electrolytic current with time. In addition, since the generated iodine reacts with water and returns to the iodide ion, the mixed solution can be used repeatedly.

[Chemical Reaction Formula]

Dose titration method: Obtain water by using iodine, sulfur dioxide, pyridine and methyl alcohol as the main components of Karl Fischer's reagent (mixed solvent).

The Karl Fischer reagent is dropped into the titration flask containing the sample to the point of change in the polarization current. Since the amount of reagent consumed is proportional to the amount of water, it is possible to quantify the moisture in the sample by expressing the inverse value of the reagent in advance.

-Quantitative range: 10㎍-100㎎ water content / sample

           Limit of detection 0.1 ㎍ water

-The amount of sample to be injected should be about 1 ~ 10ml depending on the expected water concentration, and the test should be repeated two or more times. The difference of test results should not exceed the tolerance shown in Table 1 below.

Moisture is output in ppm up to the third decimal place from the instrument printer, but the mean value is rounded to an integer value.

Moisture Concentration and Repeated Tolerance Moisture ppm Repeated allowance 30 ppm or less
Greater than 30 ppm 3 ppm
10% of average

2) dielectric breakdown voltage test

Insulation breakdown voltage is measured by using a sphere electrode having the insulating oil taken out and adjusting the gap between the electrodes to 2.5 mm to increase the voltage at a rate of about 3 kV per second. It is a measure for determining whether insulating oil can be used under a voltage system, and also a measure for determining the presence or absence of such impurities because the dielectric breakdown voltage is lowered by moisture, dust or dielectric particles in the insulating oil.

<Method of analysis (using MEGGER FOSTER Oil Test Sets OTS60AF / 2)>

-Electrical insulating oil test method (KS C 2101-1995) 22. In accordance with the dielectric breakdown voltage test, use a measuring instrument.

-Quantitative method

The breakdown voltage test was conducted at a rate of approximately 3 mA per second using a corresponding sphere electrode 12.5 mm in diameter with the sample filled to the marking line of the glass test vessel and the inter-electrode gap adjusted to 2.5 mm. Rise up to measure the dielectric breakdown voltage at the commercial frequency of the insulating oil. The device consists of a transformer, circuit breaker, resistor, thermostat, electrode, vessel and voltmeter.

-Quantification range: 0-60 ㎸

-Insulation breakdown voltage is obtained by taking two samples from the same test oil and measuring them five times for each sample as shown in Table 2 below.

The unit shall be ㎸, get to the first digit after the decimal point, and end with an integer according to KS A 0021. In addition, the measured value specifies the test temperature of the sample.

V: dielectric breakdown voltage

V ₂ + V ₃ + V ₄ + V ₅ : Measured values of the second, _{third, fourth,} and _{fifth times of the} first sample

V ₂ '+ V ₃ ' + V ₄ '+ V ₅ ': measured value of 2nd, _{3rd, 4th and 5th} samples of 2nd sample

However, in the case of silicone oil, 5 samples shall be taken from the same test oil and the average value shall be 5 measured.

Condition of breakdown voltage Dielectric breakdown voltage Repeated allowance Same condition 10 ㎸ or less

3) Computerized value test

Computerized value test is to measure by indicator titration method after taking insulation oil and dissolving it in mixed solvent. It is represented by the number of potassium hydroxide required to neutralize all acidic components contained in 1gr of insulating oil, and when the computational value is high, the insulating oil is deteriorated.

<Method of analysis (using the titration method)>

-Electrical insulating oil test method (KS C 2101 1995) 16. Comply with computerized value test.

-Quantitative method

In the computerized test, the sample was dissolved in 100 ml of a mixed solvent for toluene 3 and ethyl alcohol 2, 2 ml of alkaline blue 6B indicator was added, titrated with potassium hydroxide standard solution, and the calculated value was calculated from the standard amount of potassium hydroxide used for neutralization. Obtain

When measuring the computerized value of silicone oil, a sample is melt | dissolved in the mixed solvent for 1 toluene and 1 isopropyl alcohol (or n-butyl alcohol).

-Quantitative range: 0.01-1.00 mgKOH / g

-Take about 20gr (about 5gr sample with high computational value or dark color sample) and test it, and calculate the computation value according to the following formula, get to the third decimal place, and end with two decimal places according to KS A 0021. do.

N: Nominal concentration of 1 / 10N potassium hydroxide standard solution

A: Amount of 1 / 10N potassium hydroxide standard solution required for titration (ml)

B: Amount of 1 / 10N potassium hydroxide standard solution required for the background test (ml)

W: weight of sample (g)

Insulation oil Oil Dissolved gas  Analysis stage ( S5 )

Investigate the dissolved gas content, the amount of generation, and the aging change in the insulating oil to determine the type, location, and extent of the failure to prevent accidents.

When an abnormality occurs in the automatic voltage regulator 10, local overheating generally occurs at the location, and heat is decomposed to the surrounding insulator (insulating oil, insulating paper, press board, synthetic resin, varnish) and the like.

The thermally decomposed insulating material generates a specific gas depending on the type and the temperature of the abnormal site.

Such gases have a high saturation solubility in insulating oil and dissolve in a significant amount of insulating oil. Diagnosis by analyzing gas in oil is carried out by analyzing the dissolved gas by mass spectrometer or gas chromatograph and investigating the gas composition, quantity, secular variation, etc. To prevent it.

This method is an electrical test and the warning is warning, and it is effective for the determination of iron core local accidents, and the accident that is progressing smoothly can be found in the early stage. However, it is difficult to determine accidental accidents such as insulation breakdown in advance.

As a factor of generating gas due to the internal voltage of the automatic voltage regulator 10, as shown in Table 3, the overheating of the insulating oil, arc decomposition in water, overheating of the solid insulator, arc decomposition of the solid insulator, and the like may be considered.

Gas and Cause Caused by Internal Accident of Automatic Voltage Regulator More than
＼
Type of gas
Overheating of Insulating Oil
Solid insulator
overheating
Arc decomposition in water
Solid insulator
overheating Hydrogen (H ₂ ) ○ ○ ◎ ◎ Methane (CH ₄ ) ◎ ◎ ○ ○ Ethane (C ₂ H ₆ ) ○ ○ - - Ethylene (C ₂ H ₄ ) ◎ ◎ ○ ○ Acetylene (C ₂ H ₂ ) - - ◎ ◎ Propylene (C ₃ H ₆ ) ◎ ○ ○ ○ Propane (C ₃ H ₈ ) ○ ○ - - Carbon Monoxide (CO) - ◎ - ◎ Carbon dioxide (CO ₂ ) - ◎ - ◎

In the gas analysis of the automatic voltage regulator 10, the following 12 types of gas are generally covered. That is, H ₂ , O ₂ , N ₂ , CH ₄ , CO, CO ₂ , C ₂ H ₂ , C ₂ H ₄ , C ₂ H ₆ , C ₃ H ₆ , C ₃ H ₈ , C ₄ H ₈ , Combustible gases of H ₂ , CH ₄ , C ₂ H ₆ , C ₃ H ₆ , C ₂ H ₄ , C ₂ H ₂ as the components for determining normal and abnormality, and CO, CO ₂ as components for determining the deterioration of the insulator. , CH ₄ is used.

On the other hand, the check of the automatic voltage regulator is made as described above, and undergoes the following purification step according to whether the sample checked.

Purification step ( S6 )

In the case where the insulating oil of the automatic voltage regulator 10 contains impurities, carbon, water, or the like through the inspection of the sample as described above, impurities or carbon can be filtered through a conventional filtration filter. Filtered insulating oil can be purified by adsorbing and absorbing moisture by passing through filter paper of adsorption filter, filter such as surfactant, silica gel, zeolite, etc. Furthermore, if the degree of contamination of insulating oil is severe, replace insulating oil. It can also be purified.

1: Switch for bypass 2: Switch for automatic voltage regulator
10: automatic voltage regulator 11: radiator
12: oil drain valve 13: tap position indicator
14: oil gauge 20: control unit
21: Neutral voltage indicator 22: Automatic / manual selection switch
23: tap up / down switch 24: internal / external power selection switch
S1: pretreatment step of sample container S2: sampling step of insulating oil sample
S3: Instrument check step S4: Insulation oil deterioration measurement step
S5: Insulating oil dissolved gas analysis step S6: Refining step

Claims (2)

In the inspection method of the automatic voltage regulator installed at the end of the system of the wiring line to maintain a constant voltage,
A pretreatment step of removing oxygen and nitrogen inside the container by injecting argon gas into the sample container;
With the tap position indicator of the automatic voltage regulator set to "0", the insulating oil used in the automatic voltage regulator through the drain valve is collected in the sample container so that it does not come into contact with the atmosphere. Harvesting step;
After sampling the insulating oil, measure the secondary voltage current load of the automatic voltage regulator, the elbow connection member and connection cable of the high voltage side, the infrared temperature measurement according to the low pressure side connection bus terminal and cable overheating, and from the base to the ground terminal of the voltage regulator. Ground resistance measurement of connected ground wire, BAY-O-NET-FUSE, high pressure side bushing flange, elbow connector and bushing well insert, tap changer, low pressure side oil gauge, oil thermometer, secondary side bushing enclosure, etc. Checking the device to determine whether there is a problem with the device;
Moisture test to quantify trace moisture in the sample collected, dielectric breakdown voltage test to measure the fall of dielectric breakdown voltage by impurities such as moisture, dust, dielectric particles in dielectric oil, and measurement of degradation of dielectric oil through computerized value test Insulating oil degradation measurement step; And
A method for checking an automatic voltage regulator comprising a; analyzing the dissolved gas composition, amount, secular variation in the insulating oil to determine the type, location, and degree of failure. .
delete

Images