KR101587218B1 - System for status determination of insulation degradation of rotating machine - Google Patents

System for status determination of insulation degradation of rotating machine Download PDF

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KR101587218B1
KR101587218B1 KR1020140145440A KR20140145440A KR101587218B1 KR 101587218 B1 KR101587218 B1 KR 101587218B1 KR 1020140145440 A KR1020140145440 A KR 1020140145440A KR 20140145440 A KR20140145440 A KR 20140145440A KR 101587218 B1 KR101587218 B1 KR 101587218B1
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South Korea
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ozone
air
sensor
insulation deterioration
rotating machine
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KR1020140145440A
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Korean (ko)
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박성권
박장식
이동균
임완수
소순동
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에너시스(주)
한국중부발전(주)
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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
    • G01R31/12—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
    • G01R31/12—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing
    • G01R31/1218—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing using optical methods; using charged particle, e.g. electron, beams or X-rays
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
    • G01R31/34—Testing dynamo-electric machines

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  • General Physics & Mathematics (AREA)
  • Oxygen, Ozone, And Oxides In General (AREA)
  • Testing Relating To Insulation (AREA)

Abstract

The present invention relates to an apparatus for judging an insulation degradation state of a rotating machine. The apparatus of the present invention estimates discharging amount of slot discharge by measuring and analyzing density and wind speed/temperature of an ozone gas using a sensor in air exhausted from the rotating machine, and therefore judges degree of insulation degradation to the estimated result and warns the insulation degradation to a manager; measures more accurate ozone density in the air by analyzing the ozone density included in the air by measuring the wind speed and the temperature and the ozone density influencing on density of the air exhausted from the rotating machine; senses the ozone gas by sampling the air absorbed through a sampling nozzle in an exhaust pipe to measure the ozone density accurately; and measures the ozone gas density according to the actual discharging amount to set a threshold for judging degradation of the rotating machine by using a calibration method, and sets the measured ozone gas density as the threshold.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to an apparatus for determining an insulation deterioration state of a rotating machine,

The present invention relates to a method for detecting a degree of deterioration of an insulation state of a stator winding in a rotary machine such as a generator and an electric motor driven by a high voltage and to provide an alarm to the manager so that the insulation reinforcement action can be taken before a failure or an accident occurs. To a deterioration state judging device.

Generally, in the case of a high-voltage rotary machine such as a generator or an electric motor, failure of the insulation of the stator winding due to deterioration due to long-time operation or the like may be broken, thereby causing part of the electric line to be electrically connected to the earth, to-ground fault, or sudden stop of operation.

Therefore, various techniques for preventing ground fault by detecting the progress of insulation breakdown in the early stage are utilized in industry.

For example, when the insulation of the stator winding of the rotating machine is deteriorated, a partial discharge occurs, and the technique of detecting this partial discharge can be used to prevent an accident.

That is, the partial discharge generated in the stator winding may occur due to voids in the insulating layer, short-circuit between the insulating layers, and erosion of the surface of the stator slot.

Among them, the slot discharge caused by the erosion of the surface of the stator slot is damaged by the surface discharge due to the slot discharge at the point of occurrence, and the deterioration of the insulation deteriorates rapidly due to the characteristic of the intensity of discharge as the gap is opened. There is a tendency.

In order to detect such slot discharges in a conventional manner, a method of measuring electrical signals generated during slot discharges by inserting slot couplers into stator windings and analyzing the electrical signals has been generally used.

However, the slot discharge detection method according to the prior art measurement of the electric signal has a drawback that it is erroneously operated due to the influence of electric noise, and is expensive, so that it is difficult to be universally applied to the electric motor.

1 is a block diagram of a conventional apparatus for inserting and reinforcing an electric motor and an electric motor. The stator 11 is installed outside from the inside and the rotor 13 corresponding to the stator 11 is disposed at the center A casing 10 installed inside the casing 10 to detect the concentration of ozone gas generated in the stator 11 and to detect an ozone concentration A display means 50 for displaying the concentration of ozone gas according to the ozone detection signal of the ozone concentration detection sensor 30 and a display means 50 for displaying the concentration of ozone gas in numerical values And a control unit 70 for recognizing the ozone detection signal of the ozone concentration detection sensor 30 in real time and providing the display means 50 with a numerical value of the concentration of the ozone gas corresponding to the recognized ozone detection signal have.

The conventional generator and motor insulation reinforcing crystal device thus configured detects the gap generated between the stator and the high voltage applied portion in the generator or the motor by using the sensing of the ozone gas or the sensing of the light and displays the detection status in real time, It is possible to decide whether to repair the generator or the electric motor based on whether or not the user is detected in real time.

However, since such a conventional generator and motor insulation reinforcing crystal determining device must be installed inside the rotating machine, it is difficult to install the same and it has a problem that it affects the performance of the generator and the motor.

In addition, there is a difference in the measurement amount of the ozone gas depending on the installation position of the ozone concentration sensor according to the related art, and there is a problem that the accuracy of the measurement of the ozone concentration due to the difference in the wind speed is lowered .

In addition, without considering various factors of the air influencing the ozone concentration, the ozone concentration measuring sensor alone judges only the ozone concentration measurement value and judges whether or not the insulation deterioration is compared with the fixed threshold value, There is a problem, and accordingly, a false alarm is generated.

Korean Patent Registration No. 10-1295095 (published on August 05, 2013)

In order to solve the problems of the prior art described above, the discharge amount of the slot discharge is estimated by measuring and analyzing the concentration and the wind speed / temperature of the ozone gas using the air discharged from the rotating machine to determine the degree of insulation deterioration And to provide an alarm to the manager to determine an insulated deterioration state of the rotating machine.

Another object of the present invention is to measure the ozone concentration in the air by measuring the wind speed and temperature and the ozone concentration affecting the density of the air discharged from the rotating machine to measure the ozone concentration in the air more accurately, The object of the present invention is to measure the ozone concentration by sampling the air sucked through the nozzle to detect ozone gas.

Another object of the present invention is to measure the ozone gas concentration according to the actual slot discharging amount through the calibration method and set it as a threshold value in order to set a threshold value for judging insulation deterioration of the rotating machine, There is a purpose.

An apparatus for determining an insulated deterioration state of a rotating machine for achieving the object of the present invention includes a cooling fan for forced convection of internal air for internal cooling of a high voltage rotator and an ozone sensor for sensing ozone gas in the air discharged through an exhaust port And an insulation deterioration detector for detecting a slot discharge according to a result of analyzing the signal detected by the ozone sensor and determining an insulation deterioration state according to a result of the slot discharge, An air velocity sensor for measuring air velocity; A temperature sensor for measuring a temperature of air discharged from an exhaust port of the rotator; And an ozone gas concentration value measured from the ozone sensor and a wind speed and a temperature measurement value respectively input from the wind speed sensor and the temperature sensor are calculated to calculate an insulation deterioration index inside the rotator, And a controller for generating an alarm when it is judged that it is exceeded.

Here, the ozone detection sensor may include a sampling nozzle for sucking air in an exhaust port; And a tube for moving and supplying air containing ozone gas to the ozone detection sensor through the sampling nozzle.

The controller compares a predetermined insulation deterioration threshold value with an insulation deterioration index measured at an exhaust port of the rotating machine, and determines the degree of insulation deterioration according to a result of the comparison, and alerts.

Wherein the insulation deterioration threshold value is obtained by adding a calibrator which generates a slot discharge to an inlet of the rotary machine to generate a partial discharge amount generated at the time of insulation deterioration in the calibrator and to control the ozone gas generated by the calibrator, Value, wind speed, and temperature value.

The apparatus for determining an insulated deterioration state of a rotating machine according to the present invention estimates a discharge amount of a slot discharge by measuring and analyzing an air velocity / temperature and an ozone gas concentration of air discharged through an exhaust port of a rotating machine, Can be determined.

Furthermore, since the flux and temperature of the exhaust air affecting the concentration of the ozone gas are measured at the exhaust port of the rotating machine and used as an element that influences the determination of the deterioration of insulation according to the measured value of the ozone concentration, There is an effect that can be done.

Also, in order to set a threshold value for determining insulation deterioration of the rotor, ozone gas concentration according to the actual slot discharge amount may be measured using a calibrator, and the ozone gas concentration may be set as a threshold value, And the concentration of ozone gas is measured and set as an insulation deterioration threshold value. Thus, there is an effect that the insulation deterioration state can be warned in steps of caution, risk, and the like.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a block diagram of a conventional apparatus for determining insulation and augmentation of a motor,
FIG. 2 is a block diagram of an apparatus for determining an insulation deterioration state of a rotating machine according to an embodiment of the present invention,
3 is a configuration diagram of an ozone gas concentration measuring apparatus according to another embodiment of the present invention,
4 is a configuration diagram of an apparatus for measuring ozone gas concentration using a sensor node according to another embodiment of the present invention,
FIG. 5 is a detailed block diagram of the sensor node in FIG. 4,
6 is a configuration diagram of an apparatus for setting an insulation deterioration determination threshold according to an embodiment of the present invention,
7 is a view for explaining the correlation between the ozone gas concentration and the air velocity of the exhaust port according to the embodiment of the present invention,
8 is a graph for explaining a method of calculating an insulation deterioration threshold value for insulation deterioration determination.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The structure and operation of an apparatus for determining the deterioration state of a rotor according to an embodiment of the present invention will be described in detail with reference to the accompanying drawings.

FIG. 2 is a block diagram of an apparatus for determining the insulation deterioration state of a rotating machine according to an embodiment of the present invention. The apparatus includes a rotor 100 such as a generator or an electric motor composed of a rotor and a stator, and an air inlet 101 and an air outlet 102 A cooling fan 103 for sucking outside air for forced convection to the outside to cool the inside of the rotating machine 100 and a fan 102 for measuring the wind speed of the air discharged from the exhaust port 102 of the rotator 100 A temperature sensor 112 for measuring the temperature of the air exhausted from the exhaust port 102 of the rotator 100 and a temperature sensor 112 for detecting and measuring ozone gas in the air exhausted through the exhaust port 102. [ Analyzing the measured wind speed and temperature values input from the ozone sensor 113, the wind speed sensor and the temperature sensors 111 and 112 and the ozone gas concentration measured by the ozone sensor 113, The insulation deterioration index inside the rotating machine 100 is calculated, And a controller 120 for generating an alarm when it is determined that the predetermined insulation deterioration threshold value is exceeded.

FIG. 3 is a block diagram of a suction / reception ozone sensor according to another embodiment of the present invention. The ozone detection sensor 113 includes a sampling nozzle 141 for sucking air in the air outlet 102 by a suction / A tube 142 for moving air containing ozone gas through the sampling nozzle 141 to the ozone sensor 113 and a pump 143 for forcibly introducing air through the tube 142 do.

FIG. 4 is a block diagram of an ozone sensor using a sensor node according to another embodiment of the present invention. The ozone sensor 113 includes a plurality of sensor nodes 150 disposed in the exhaust port 102, And a collector 160 for collecting wired or wirelessly transmitted ozone concentration measurement values through the sensor node 150 and transmitting the measured values to the controller 120. The sensor node 150 As shown in FIG. 5, includes a wireless communication module 151 for transmitting the measured ozone concentration value sensed by the built-in ozone sensor 113 by wire or wireless.

FIG. 6 is a block diagram of an apparatus for setting an insulation deterioration determination threshold value according to an embodiment of the present invention. The calibrator 130 generates a high voltage for generating an arbitrary slot discharge in the intake port 102 of the rotary machine 100 And an electrode 132 for generating a partial discharge by the high voltage generating unit 131. The calibrator 130 generates a slot discharge similar to the slot discharge in the fixed slot, And a discharge cell made of an electrode and an insulating material.

Hereinafter, the operation of the present invention will be described in detail with reference to FIGS. 2 to 8. FIG.

First, the insulation deterioration state determinator of a rotating machine is installed in a rotating machine driven by a high voltage of several kV or more, such as a generator or a high voltage electric motor, and the rotating machine applied to the present invention uses external air And is a forced convection type rotating machine that cools the inside of the rotating machine and discharges it to the exhaust port.

In such a high voltage rotor, ozone gas (O 3 ) is generated when a slot discharge occurs due to insulation deterioration of the stator winding, and the ozone gas is discharged to the exhaust port by taking the flow of the cooling wind for cooling the rotor.

The apparatus for determining insulation deterioration according to the present invention is provided with an ozone gas sensor, an air speed sensor, a temperature sensor, and the like at an air outlet to measure the air velocity, the temperature and the concentration of ozone gas, The insulation deterioration index calculated by the gas concentration measurement value is compared with a predetermined heat dissipation deterioration threshold value, the insulation deterioration state is determined according to the result, and the manager is alerted.

FIG. 2 is a block diagram of an apparatus for determining the insulation deterioration state of a rotating machine according to an embodiment of the present invention. As the rotating machine 100 operates, a cooling fan 103 disposed at an air intake port 102 is driven, 0.0 > 100). ≪ / RTI >

The air introduced into the inside of the rotating machine 100 cools the rotating machine and discharges the air to the outside through the air outlet 102.

At this time, the wind velocity and temperature of the exhaust air are measured by the respective wind speed, temperature sensor and ozone concentration sensor 111 (112) 113 of the exhaust port 102, and the concentration of the ozone gas contained in the air is measured do.

The measured wind speed, temperature, and ozone gas measured at the exhaust port 102 are input to the controller 120 and analyzed, and the estimated amount of slot discharge occurring in the rotor 100 is estimated.

The calculated slot discharging amount is compared with a preset threshold value, and an alarm sound or an alarm message is generated to the manager in a step such as a caution or a danger according to the degree of the comparison result exceeding the threshold value.

FIG. 3 is a block diagram of an insulation deterioration determining apparatus using a hops-up type ozone gas sensor according to another embodiment of the present invention. The suction type ozone sensing apparatus includes a pump 143 for sucking air, The concentration of the ozone gas is measured by sampling the air containing the ozone gas through the sampling nozzle 141 installed.

That is, as the pump 143 is driven, the exhaust air flows from the sampling nozzle 141 through the tube 142, and the introduced air is measured by the ozone sensor 113 and then supplied to the controller 120 And estimates the amount of slot discharge according to the concentration of ozone.

FIGS. 4 and 5 are block diagrams of an apparatus for determining insulation deterioration using a sensor node according to another embodiment of the present invention. In FIG. 4 and FIG. 5, a plurality of sensor nodes 150 having an ozone sensor 113 built in the exhaust port 102 And the ozone concentration of the exhaust air at each point is measured.

Each of the sensor nodes 150 measures the concentration of ozone contained in the exhaust air and transmits the measured ozone concentration measurement value through the built-in wired or wireless communication module 151.

Here, the communication module 151 has a wireless communication function such as an asynchronous serial communication such as RS232 or a Zigbee, preferably a Zigbee wireless communication module.

The ozone concentration measurement values of each sensor node 150 transmitted through the communication module 151 are collected by a collector 160 such as an access point (AP) and transmitted to the controller 120 to analyze the ozone concentration measurement values .

The controller 120 calculates an insulation deterioration index D for determining the insulation deterioration state by using the measured values of the iron voltage v, the temperature T and the ozone concentration n obtained through the above process, 1 < / RTI >

Figure 112014102222772-pat00001

Figure 112014102222772-pat00002

Here, a, b, and c are parameters obtained by multiple regression analysis between independent variables and dependent variables.

FIG. 6 is a block diagram of an apparatus for setting an insulation deterioration determination threshold value according to an embodiment of the present invention. The insulation deterioration determination threshold value is set through an electrode 132 of the calibrator 130 located at an intake port 102 of the rotary machine 100, And a threshold point is set on the basis of the ozone gas measurement value measured at the exhaust port 102 by the generated ozone gas.

In such an insulation deterioration state, a critical point must be set in order to determine the degree of deepening of insulation deterioration by measuring the ozone concentration (n). In order to set a critical point, a calibration process using a calibrator must be performed as shown in FIG.

That is, since the insulated deterioration state determining apparatus of the present invention can not directly measure slot discharges, the insulated deterioration state is determined indirectly by measuring the concentration of ozone gas, which is a by-product of slot discharges.

Setting of the threshold value through the calibration process will be described in detail as follows.

Since the stator winding insulated state of the rotor 100 is assumed to be in a good state at the initial stage of the installation of the rotor 100, slot discharge hardly occurs and therefore no ozone gas is generated.

However, the calibrator 130 is driven to generate a slot discharge artificially. The electric discharge is generated by applying a high voltage to the rotor suction port 101.

At this time, since the calibrator 130 can check the amount of slot discharge using the slot discharge measuring device, the calibrator 130 adjusts the slot discharge value to be a threshold value of the insulation deterioration detection in advance.

Generally, the slot discharge value of the rotating machine 100 is expressed by a partial discharge quantity in the unit of picocoulon (pC). It is determined that the insulation is good when less than 5000 pC, It is preferable that the calibrator 130 adjusts the slot discharge value to a value somewhat lower than 15,000 pC.

Since the state of the slot discharge deteriorates rapidly as the degree of insulation deterioration increases, it is desirable to set the threshold value of the insulation deterioration detection from 10,000 pC to 15,000 pC.

For example, if you want to set the threshold for insulation deterioration detection to 14,000pC, use a calibrator electrode with a 14,000pC slot discharge.

The electrode 132 of the calibrator 130 is positioned on the intake port 101 and the high voltage power source HV AC is applied to the electrode 132 in the state where the cooling fan 103 of the rotating machine 100 is in operation, Thereby causing discharge to occur.

By doing so, ozone gas is generated as if a slot discharge of 14,000 pC was generated somewhere in the stator winding in the rotor 100. The ozone gas concentration was measured at the exhaust port 102, .

FIG. 7 is a graph for explaining the correlation between the ozone gas concentration and the air velocity of the exhaust port according to the embodiment of the present invention. In FIG. 7, the wind velocity v measured through the air velocity sensor and the ozone detection sensor 113 at the exhaust port 102 The ozone concentration (n) varies depending on the measurement position.

For example, the average ozone concentration (n) generated according to the slot discharge is calculated by the following equation (2).

Figure 112014102222772-pat00003

Here, 'k' is a constant and, 'v' is the exhaust air speed (cms -1) a, 's' is a vent area (cm 2) is, 'a' is generated per slot ozone water discharge energy (erg -1) 'U' is the consumed average energy (erg) in one cycle discharge, and 'f' is the frequency of the applied voltage.

If the slot discharge amount is constant as in Equation (2), the concentration of ozone gas in the air is inversely proportional to the air cross-sectional area and the air velocity of the exhaust port 102 as shown in Equation (3).

Figure 112014102222772-pat00004

That is, when the cross-sectional area s is wide or the velocity v of the air is high, the ozone concentration n becomes low.

The relationship between the temperature T and the ozone concentration n is represented by the inverse relationship as shown in the following equation (4).

Figure 112014102222772-pat00005

That is, when the temperature is high, the ozone concentration (n) is lowered. When the temperature of the air is high, the ozone gas density is lowered. This decreases the number of reactions in which O 2 and O are combined to generate O 3 , It is because it lowers.

.

7, the ozone gas O 3 generated by the slot discharge is discharged through the exhaust port 102 through the duct. The air velocity and the ozone concentration at the front and rear of the exhaust port 102 Can be known.

When the air flow is fast, the ozone concentration n is very low. When the air is out of the exhaust port 102, the pressure of the air becomes weaker as the distance from the exhaust port 102 becomes longer, And the ozone concentration (n) increases.

This is because ozone molecules with slower moving speed v are accumulated. The distance from the exhaust port 102 to the point where, for example, the velocity v of the air is lowered to 10% or less, the diffusion of the ozone gas due to the environmental influence such as natural convection rather than the influence of the cooling wind The direction and velocity depend on the concentration of ozone.

When the ozone gas generated in the calibrator 130 flows into the exhaust port 102 through the inside of the rotator 100, the ozone concentration sensor 113 measures the ozone concentration measured at the exhaust port 102 side, Set the critical point based on the value.

7, it is important to find an appropriate sampling position using the wind speed sensor 111. The closer the sampling position is to the exhaust port 102, the lower the ozone concentration is, which is difficult to measure. On the other hand, So that the wind pressure at the exhaust port 102 is not reached, the ozone concentration becomes fluid due to the surrounding environment and reliable measurement can not be performed.

Since the wind speed of the cooling fan 103 can be adjusted to change the wind speed, the ozone concentration is measured while changing the wind speed during calibration to obtain the critical point calculation parameters according to the correlation between the wind speed and the ozone concentration.

8 is a graphical representation for explaining a method for calculating a threshold value for the insulation deterioration judgment, in which the critical point calculation parameter has a function relationship between the ozone concentration (n) and the slot discharge value as shown in the following equation (5) , And a and b in the function curve.

Figure 112014102222772-pat00006

Here, if the wind speed v is constant, it can be assumed that there is only one function curve. However, if the wind velocity v is variable to v1> v2> v3, the ozone concentration measured in each case also varies in the same slot discharge value.

For example, if the slot discharge value to be set as the critical point is 15,000 pC, and the wind speed is v2, the critical point ozone concentration should be N2. If the wind speed is changed to v3 slower than v2, if the critical point is still set to N2, the alarm signal will be output even if it does not reach 15,000pC.

In this case, however, the wind speed v may have to be measured. If the rotating fan 100 stops for a predetermined period of time or longer and the cooling fan 103 stops together, The remaining ozone molecules are gradually discharged by natural diffusion, so that the ozone concentration higher than actual can be measured for a while.

Thus, a low weight for the ozone concentration measurement value is provided so as not to output a malfunction alarm signal when the wind speed sensor 111 is at a constant speed or below. In equation (f), n is the measured ozone gas concentration measurement value V is the wind speed measured by the wind speed sensor and T is the absolute temperature measured by the temperature sensor 112. [

In order to change the critical point according to the wind speed, it is necessary not to set the critical point as the measurement value of the ozone concentration but to use the function of the ozone concentration measurement value and the wind speed and temperature value as variables. The value calculated by this function (f) is called an insulation deterioration index (D).

If the cooling fan 103 of the ship-shape rotary machine 100 for calculating the insulation deterioration index D is unable to adjust the speed, the following equation (4) can be considered that the wind speed v is always constant, The ozone concentration is measured to obtain the parameter.

That is, the controller 120 calculates and sets the insulation deterioration threshold value according to Equation (1) using the wind speed, temperature, and ozone concentration measurement values obtained through the calibration process.

The insulation deterioration threshold value thus calculated is compared with the insulation deterioration index D calculated through Equation 1 by using the wind speed, temperature, and ozone gas measurement values after the rotor 100 is actually driven, And the insulation deterioration state is determined according to the result.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed exemplary embodiments. It will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention.

100: rotator 101: intake port
102: exhaust port 103: cooling fan
111: wind speed sensor 112: temperature sensor
113: ozone sensor 120: controller
130: Calibrator 131: High voltage generator
132: electrode 141: sampling nozzle
142: tube 143: pump
150: sensor node 151: communication module
160: Collector

Claims (13)

A cooling fan for forced convection of the internal air for internal cooling of the high voltage rotator, and an ozone sensor for sensing ozone gas in the air discharged through the exhaust port. According to the analysis result of the signal detected from the ozone sensor An insulation deterioration state judging device for a rotating machine for detecting whether or not a slot discharge has occurred and judging an insulation deterioration state according to the result,
An air speed sensor for measuring an air speed of the air discharged from an exhaust port of the rotating machine;
A temperature sensor for measuring a temperature of air discharged from an exhaust port of the rotator;
And an ozone gas concentration value measured from the ozone sensor is calculated to calculate an insulation deterioration index of the inside of the rotating machine, A controller that generates an alarm if it is determined to be an alarm; And
And a calibrator installed at an inlet of the rotating machine to generate an arbitrary slot discharge step by step,
The insulation deterioration index and the insulation deterioration threshold value calculated by the controller are calculated through multiple regression analysis using the wind speed, temperature, and ozone gas concentration as independent variables,
The insulation deterioration threshold value may be determined by measuring an ozone gas concentration value, an air speed, and a temperature value due to slot discharges generated in the calibrator at the exhaust port, and determining a stepwise insulation deterioration threshold value based on the insulation deterioration index calculated through the multiple regression analysis Wherein the controller is configured to determine an insulation deterioration state of the rotating machine.
The method according to claim 1,
The ozone sensor includes a sampling nozzle for sucking air in an exhaust port;
A tube for moving the ozone gas containing air through the sampling nozzle to the ozone sensor; And
And a pump for forcibly introducing air through the tube, wherein the sensor is a suction / reception ozone sensor.
The method according to claim 1,
Wherein the ozone sensor detects the number of measurement points of the ozone gas by disposing a plurality of sensor nodes in the exhaust port. The method of claim 3,
Wherein the sensor node is equipped with an ozone detection sensor and a communication module and transmits the ozone concentration measurement value sensed through the ozone detection sensor through the communication module by wire or wirelessly. 5. The method of claim 4,
Further comprising a collector for collecting the wasted or wirelessly transmitted ozone concentration measurement value through the sensor node and transmitting the measured value to the controller. The method according to claim 1,
Wherein the controller compares a predetermined insulation deterioration threshold value with an insulation deterioration index measured at an exhaust port of the rotating machine, and determines an insulation deterioration degree according to a result of the comparison and alerts the alarming deterioration degree. The method according to claim 1,
Wherein the controller calculates an average ozone concentration value (n) by the following equation.
[Mathematical Expression]
Figure 112014102222772-pat00007

Where k is < RTI ID = 0.0 &
where v is the exhaust air velocity (cms -1 ), s is the vent area (cm 2 ), a is the ozone water (erg -1 ) generated per slot discharge energy, U is the consumed average energy (erg) And f is the frequency of the applied voltage. 8. The method of claim 1 or 7,
Wherein the controller is in an inverse proportion relationship with the ozone concentration value (n) of the ozone gas in the air if the slot discharge amount is constant, as in the following equation.
[Mathematical Expression]
Figure 112014102222772-pat00008
 The method according to claim 1,
Wherein the controller determines that the relationship between the ozone concentration value (n) of the ozone gas and the air temperature (T) of the exhaust port is inversely proportional to the following equation.
[Mathematical Expression]
Figure 112014102222772-pat00009

 delete delete 7. The method according to claim 1 or 6,
Wherein an insulation deterioration index and an insulation deterioration threshold value calculated through multiple regression analysis in the controller are calculated by the following equation.
[Mathematical Expression]
Figure 112015103693596-pat00010

Figure 112015103693596-pat00011

Where a, b, and c in the function (f) are parameters obtained by multiple regression analysis between independent and dependent variables, v is the wind speed, T is the temperature value, and n is the measured ozone gas concentration measurement value . The method according to claim 1,
The calibrator includes a high voltage generator for generating an arbitrary slot discharge at an intake port of the rotating machine; And
And an electrode for generating a slot discharge in the intake port by the high voltage generating unit.
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