KR20030033692A - Capacitance measurement probe for generator stator winding insulation - Google Patents

Capacitance measurement probe for generator stator winding insulation Download PDF

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Publication number
KR20030033692A
KR20030033692A KR1020010065781A KR20010065781A KR20030033692A KR 20030033692 A KR20030033692 A KR 20030033692A KR 1020010065781 A KR1020010065781 A KR 1020010065781A KR 20010065781 A KR20010065781 A KR 20010065781A KR 20030033692 A KR20030033692 A KR 20030033692A
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KR
South Korea
Prior art keywords
measurement
winding
generator stator
top plate
capacitance
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KR1020010065781A
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Korean (ko)
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김성휘
이현
배용채
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한국전력공사
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Priority to KR1020010065781A priority Critical patent/KR20030033692A/en
Publication of KR20030033692A publication Critical patent/KR20030033692A/en

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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R1/00—Details of instruments or arrangements of the types included in groups G01R5/00 - G01R13/00 and G01R31/00
    • G01R1/02—General constructional details
    • G01R1/06—Measuring leads; Measuring probes
    • G01R1/067—Measuring probes
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R27/00—Arrangements for measuring resistance, reactance, impedance, or electric characteristics derived therefrom
    • G01R27/02—Measuring real or complex resistance, reactance, impedance, or other two-pole characteristics derived therefrom, e.g. time constant
    • G01R27/26—Measuring inductance or capacitance; Measuring quality factor, e.g. by using the resonance method; Measuring loss factor; Measuring dielectric constants ; Measuring impedance or related variables
    • G01R27/2605—Measuring capacitance
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01R—ELECTRICALLY-CONDUCTIVE CONNECTIONS; STRUCTURAL ASSOCIATIONS OF A PLURALITY OF MUTUALLY-INSULATED ELECTRICAL CONNECTING ELEMENTS; COUPLING DEVICES; CURRENT COLLECTORS
    • H01R13/00—Details of coupling devices of the kinds covered by groups H01R12/70 or H01R24/00 - H01R33/00
    • H01R13/62—Means for facilitating engagement or disengagement of coupling parts or for holding them in engagement
    • H01R13/629—Additional means for facilitating engagement or disengagement of coupling parts, e.g. aligning or guiding means, levers, gas pressure electrical locking indicators, manufacturing tolerances
    • H01R13/633—Additional means for facilitating engagement or disengagement of coupling parts, e.g. aligning or guiding means, levers, gas pressure electrical locking indicators, manufacturing tolerances for disengagement only
    • H01R13/635—Additional means for facilitating engagement or disengagement of coupling parts, e.g. aligning or guiding means, levers, gas pressure electrical locking indicators, manufacturing tolerances for disengagement only by mechanical pressure, e.g. spring force

Abstract

PURPOSE: A capacitance measurement probe for winding of a generator stator is provided to reduce maintenance cost and to increase operation reliability by measuring and diagnosing absorption state of a cooling water with high reliability. CONSTITUTION: A top plate(3) has a connection tube(2) guiding a signal measurement cable(1). The top plate is connected to a box type bottom frame(5) via a bolt(4). An inner plate is embedded between the top plate and the bottom frame. The inner frame is supported elastically by several tension springs so that a metallic sponge(9) attached with a metallic film(8) is formed toward an open bottom(1) of the bottom frame. Thus, a constant surface pressure is applied without regard to a measurement pressure and the number of measurement of a measurement person.

Description

발전기 고정자의 권선용 정전용량 측정프로브{Capacitance measurement probe for generator stator winding insulation}Capacitance measurement probe for generator stator winding insulation

본 발명은 대형 발전소의 발전기를 구성하는 고정자의 절연물에 대한 냉각수 흡습 진단용 측정프로브에 관한 것으로, 특히 고정자 권선 절연물에 냉각수 흡습여부를 측정 및 진단하는 발전기 고정자의 권선용 정전용량 측정프로브에 관한 것이다.The present invention relates to a measurement probe for diagnosing coolant moisture absorption of an insulation of a stator constituting a generator of a large power plant, and more particularly, to a capacitance measuring probe for winding of a generator stator for measuring and diagnosing whether water is absorbed into a stator winding insulation.

공지된 바와 같이 대용량 발전소에서 사용되는 발전기는 크게 회전자와 고정자로 구성되어 있으며, 발전 운전중 발생되는 열을 냉각하기 위하여 회전자측은 수소, 고정자측은 냉각수(순수)를 이용하고 있다.As is known, a generator used in a large capacity power plant is largely composed of a rotor and a stator. In order to cool the heat generated during power generation operation, hydrogen is used on the rotor side and cooling water (pure water) on the stator side.

한편 발전기 고정자 권선은 운전중 냉각수에 의한 부식과 전자력에 의한 진동으로 손상을 받으며, 이들로 인한 수소 또는 냉각수 누설은 절연파괴 등의 2차 파급 사고를 유발할 수 있음에 따라. 각 발전소에서는 정기 계획 예방정비 기간중 고정자 권선에 대한 누수 시험을 수행함으로써 운전 신뢰성을 확보하고 있는 실정이다.On the other hand, generator stator windings are damaged by corrosion by coolant and vibration by electromagnetic force during operation, and the leakage of hydrogen or coolant due to them can cause secondary ripple accidents such as insulation breakdown. In each power plant, reliability of operation is ensured by performing leakage test on the stator windings during the period of preventive maintenance.

그러나 최근에는 고정자 권선의 누수뿐 아니라 권선 절연물 내의 흡습 여부의 진단에도 관심이 커지고 있는바, 즉 진동, 부식으로 인한 권선 박리 또는 경년 열화로 인한 절연물 손상으로 인하여 냉각수가 절연물을 따라 흡습될 때 주절연(groundwall insulation) 파괴의 가능성이 커지기 때문이다.Recently, however, there has been a growing interest in not only leakage of stator windings, but also diagnosis of hygroscopicity in winding insulation, that is, the main insulation when the coolant is absorbed along the insulation due to winding damage due to vibration, corrosion or insulation damage due to aging. (groundwall insulation) because of the increased probability of destruction.

한편 일반 정전용량 측정장치는 발전기 고정자 권선을 측정하기에는 오차 범위가 크고, 특히 이미 제작되어 있는 각종 프로브로는 발전기 고정자 권선의 정전용량 측정용으로는 적합하지 못한 실정이었다.On the other hand, the general capacitance measuring device has a large error range for measuring the generator stator winding, and in particular, various probes that have already been manufactured are not suitable for measuring the capacitance of the generator stator winding.

즉, 통상적으로 발전기에서 발생되는 진동 및 부식 그리고 갱년열화에 따른 손상으로 인하여 도 1에 도시된 바와 같이 고정자의 권선 절연물(101)이 동선(102)과 박리(103)되어 이 권선절연물(101)에 냉각수가 흡습될 수 있는데, 이는 주절연파괴로 인한 2차 파급사고를 유발할 수 있기 때문에 고정자 권선의 주절연(groundwall insulation)내에 습분이 존재하는지를 측정하기 위하여 정전용량을 사용한다.That is, the winding insulation 101 of the stator is peeled off 103 with the copper wire 102 as shown in FIG. The coolant can be absorbed, which uses capacitance to measure the presence of moisture in the groundwall insulation of the stator windings, as it can cause secondary ripple incidents due to primary insulation breakdown.

이러한 정전용량의 측정은 도 2에 도시된 바와 같이 두전극 사이에 발생되는 정전용량의 크기(C)는 다음과 같다.As for the measurement of the capacitance, as shown in FIG. 2, the magnitude C of the capacitance generated between the two electrodes is as follows.

여기서 S = 전극의 면적, d는 권선 절연물의 거리, ｋ는 비례상수이다.Where S = area of the electrode, d is the distance of the winding insulation, and ｋ is the proportionality constant.

따라서 발전기 고정자 권선의 경우 측정 프로브의 면적이 일정하면 절연물의 거리는 항상 일정하므로 정전용량의 크기는 발전기 고정자 권선의 주 절연물과 물의 절연율(dielectric constant)에 의하여 결정됨을 알 수 있다. 즉, 측정된 정전용량이 높다는 것은 권선 내에 유전율이 증가한 것을 의미하므로 흡습된 것으로 판단될 수 있다.Therefore, in the case of generator stator windings, if the area of the measuring probe is constant, the distance of the insulator is always constant, so the magnitude of the capacitance is determined by the dielectric constant of the main insulator and water of the generator stator windings. That is, high measured capacitance means that the dielectric constant is increased in the winding, and thus may be determined to be absorbed.

이에 본 발명은 상기와 같은 이유로 인하여 발명된 것으로, 권선 절연물의 구조적 특성과 측정에 따른 문제점들을 고려하여 발전기 고정자의 권선에 흡습되는 냉각수의 흡습상태를 높은 신뢰성으로 측정 및 진단할 수 있어서 정비비용의 절감과 운전 신뢰성의 증진을 도모한 발전기 고정자의 권선용 정전용량 측정프로브를 제공함에 그 목적이 있다.Therefore, the present invention has been invented for the same reason as described above. In consideration of the structural characteristics and the problems caused by the measurement of the winding insulator, the hygroscopic state of the coolant absorbed by the windings of the generator stator can be measured and diagnosed with high reliability, resulting in maintenance cost The object of the present invention is to provide a capacitive measuring probe for winding of a generator stator, which aims at saving and improving operation reliability.

도 1은 일반적인 발전기 고정자의 권선 절연물 박리 설명도,1 is an explanatory diagram of peeling winding insulation of a general generator stator;

도 2는 정전용량 측정 원리도를 나타낸 도면,2 is a diagram showing a principle diagram of capacitance measurement;

도 3은 본 발명에 따른 고정자의 권선용 정전용량 측정프로브를 나타낸 사시도,3 is a perspective view showing a capacitance measurement probe for winding the stator according to the present invention;

도 4는 도 3의 분리사시도,4 is an exploded perspective view of FIG. 3;

도 5는 별도 가이드장치의 도면,5 is a view of a separate guide device,

도 6은 본발명의 장치를 이용하여 측정한 정전용량 분포그래프의 일예이다.6 is an example of a capacitance distribution graph measured using the apparatus of the present invention.

- 도면의 주요부분에 대한 부호의 설명 --Explanation of symbols for the main parts of the drawings-

1 - 신호측정 케이블,2 - 연결관,1-measuring cable, 2-connector,

3 - 상부판,4 - 보울트,3-top plate, 4-bolt,

5 - 하부프레임,6 - 내부판,5-lower frame, 6-inner plate,

7 - 장력스프링,8 - 금속막,7-tension spring, 8-metal film,

9 - 탄성스폰지,10 - 개방밑면,9-elastic sponge, 10-open bottom,

상기와 같은 목적을 달성하기 위한 본 발명은 신호측정 케이블을 안내하는 연결관을 갖춘 상부판과, 이 상부판이 체결되는 박스형 하부프레임, 이 상부판과 하부프레임 사이에 내장되어 탄성스폰지를 일정한 면압으로 작용시키는 내부판으로 이루어지되, 상기 내부판은 여러개의 장력스프링으로 지지되어 탄성스폰지를 하부프레임의 개방 밑면 쪽으로 부세되어 있다.The present invention for achieving the above object is an upper plate having a connection pipe for guiding the signal measuring cable, a box-shaped lower frame to which the upper plate is fastened, built between the upper plate and the lower frame elastic sponge with a constant surface pressure It consists of an inner plate to act, the inner plate is supported by a plurality of tension springs are urged toward the open bottom of the lower frame.

이하, 본 발명을 첨부된 예시도면에 의거 상세히 설명한다.Hereinafter, the present invention will be described in detail with reference to the accompanying drawings.

도 3과 도 4는 본 발명에 따른 발전기 고정자의 권선용 정전용량 측정프로브를 나타낸 사시도와 분리 사시도이다.3 and 4 are a perspective view and an exploded perspective view showing the capacitance measuring probe for winding the generator stator according to the present invention.

본 발명은 도면에 도시된 바와 같이 신호측정 케이블(1)을 안내하는 연결관(2)을 갖춘 상부판(3)과, 이 상부판(3)이 보울트(4)를 매개로 체결되는 박스형 하부프레임(5), 이 상부판(3)과 하부프레임(5) 사이에 내장되는 내부판(6)으로 이루어지되, 상기 내부판(6)은 여러개의 장력스프링(7)으로 탄지되어 금속막(8)이 부착된 탄성스폰지(9)를 하부프레임(5)의 개방밑면(10) 쪽으로 부세시킨 구조로 되어 있다.According to the present invention, the upper plate 3 having a connecting pipe 2 for guiding the signal measuring cable 1 as shown in the drawing, and the lower box-type in which the upper plate 3 is fastened through the bolt 4 as a medium. It consists of a frame (5), an inner plate (6) embedded between the upper plate (3) and the lower frame (5), wherein the inner plate (6) is supported by a plurality of tension springs (7) to the metal film ( The elastic sponge 9 to which 8) is attached is urged toward the open bottom surface 10 of the lower frame 5.

그리고, 상기 상부판(3)의 연결관(2)을 통하여 연장되는 신호측정 케이블(1)은 내부판(6)의 금속막(8)에 연결되어 있으며, 이 금속막(8)은 알루미늄 재질의 금속막이면 바람직하다.The signal measuring cable 1 extending through the connecting pipe 2 of the upper plate 3 is connected to the metal film 8 of the inner plate 6, and the metal film 8 is made of aluminum. It is preferable if it is a metal film of.

한편, 통상적으로 발전기 고정자의 권선 흡습상태를 측정하기 위하여 측정되는 정전용량의 단위는 ㎊(10-12)으로써, 매우 정밀한 측정값이 요구되는 실정이며, 또한 고정자의 권선위치, 표면상태, 측정방법 등에 따라 다양하게 달라질 수 있기 때문에 보다 정확하고 신뢰성을 갖춘 데이타를 얻을 수 있도록 측정해야 하는바, 따라서 본 발명은 고정자의 권선 제작 및 조립상태가 일정하다는 가정이 수반되어진 상태에서 이루어진다.On the other hand, the unit of capacitance measured in order to measure the hygroscopic state of the generator stator is typically ㎊ (10 -12 ), which requires very precise measurement values, and also the stator's winding position, surface condition, and measuring method. Since it may vary in various ways, it should be measured so that more accurate and reliable data can be obtained. Therefore, the present invention is made under the assumption that the stator winding and assembly state are constant.

먼저 공지된 바와 같이 발전기 고정자의 슬롯에 있는 권선의 절연물에 본 발명의 탄성스폰지(9)를 갖다 대면, 표면은 절연 페인트가 칠해져 있으므로 표면의 거칠기가 각각 다를 수 있으므로 이를 보상하기 위해 상기 내부판(6) 표면에 탄성스폰지(9)를 사용하였으며, 이 탄성스폰지(9) 표면에 알루미늄 재질의 금속막(8) 내지는 비닐을 이용하여 신호를 적절하게 받을 수 있다. 이때 비닐을 사용하여 빈번한 측정으로 인한 알루미늄 재질의 금속막(8) 손상을 방지한다.First, when the elastic sponge 9 of the present invention is applied to the insulation of the winding in the slot of the generator stator, the surface is coated with insulating paint, so that the roughness of the surface may be different, so that the inner plate ( 6) An elastic sponge 9 is used for the surface, and a signal can be appropriately received using the metal film 8 or vinyl made of aluminum on the surface of the elastic sponge 9. At this time, using a vinyl to prevent damage to the metal film (8) made of aluminum due to frequent measurements.

또한, 측정위치에 따른 정전용량의 미세한 변화와 고정자 슬롯 끝부분의 권선에 존재하는 코로나 방지용 도료의 영향을 없애기 위하여 도 5에 도시된 바와 같이 가이드 홀더(12)에 부착된 위치 설정용 가이드(11)를 설치하여 탈부착을 가능하게 할 수 있다.In addition, the positioning guide 11 attached to the guide holder 12, as shown in Figure 5 in order to eliminate the small changes in the capacitance according to the measurement position and the effect of the corona-preventive paint present in the winding of the end of the stator slot ) Can be attached and detached.

또한 정전용량이 접촉면인 탄성스폰지(9)의 면압에 의하여 측정값이 변하는 것을 방지하기 위하여 내부에 장력스프링(7)을 설치하여 일정한 힘이상이 되면, 항상 일정한 크기의 면압이 작용하도록 되어 있기 때문에 정전용량의 측정값에 대한 신뢰성을 증진시킨다.In addition, in order to prevent the measured value from being changed by the surface pressure of the elastic sponge 9 which is the contact surface of the capacitance, when the tension spring 7 is installed inside the predetermined force or more, the surface pressure of a certain size always acts. Improve the reliability of the capacitance measurements.

그리고 본 발명은 측정시 마다 수행하여야 하는 외부공기 및 주위의 정전용량의 값에 대한 보상 및 장치에 연결되는 신호측정 케이블(1)의 길이에 따른 초기값에 대한 보상을 수행함으로써 측정값에 대한 신뢰도를 높인다.In addition, the present invention provides the reliability of the measured value by performing compensation for the value of the external air and the surrounding capacitance to be performed at each measurement and compensation for the initial value according to the length of the signal measuring cable 1 connected to the apparatus. Increase

한편, 도 6과 같이 고정자 각 슬롯에 고정되어 있는 권선의 절연물에 대한 정전용량을 각각 측정하여 이를 데이타에 대한 정규분포 그래프를 구하여 통계적으로 측정 및 진단할 수 있도록 되어 있다.Meanwhile, as shown in FIG. 6, the capacitances of the insulation of the windings fixed to the slots of the stator are respectively measured, and the normal distribution graphs for the data are obtained to statistically measure and diagnose the results.

본 발명은 발전기 고정자의 권선흡습 시험에 적용, 각 고정자 권선의 냉각수 흡습 여부를 진단하여 측정 신뢰도를 높임으로써 발전기 운전중 절연파괴로 인한 사고 예방 및 발전소 운전 신뢰성을 증진시킬 수 있도록 되어 있다.The present invention is applied to the winding absorption test of the generator stator, by diagnosing the cooling water absorption of each stator winding to increase the measurement reliability to prevent accidents due to insulation breakdown during generator operation and to improve the operation reliability of the power plant.

또한 본 발명은 측정시 측정자의 힘에 따라 프로브의 압력(면압)이 변하여 측정값이 달라지는 것을 막기 위하여 어떤 사용자 또는 측정횟수에 관계없이 항상 일정한 면압을 유지시키는 잇점이 있다.In addition, the present invention has the advantage of maintaining a constant surface pressure at all times regardless of the user or the number of measurements in order to prevent the measurement value is changed by changing the pressure (surface pressure) of the probe in accordance with the force of the measurer during the measurement.

Claims (2)

신호측정 케이블(1)을 안내하는 연결관(2)을 갖춘 상부판(3)과, 이 상부판(3)이 보울트(4)를 매개로 체결되는 박스형 하부프레임(5), 이 상부판(3)과 하부프레임(5) 사이에 내장되는 내부판(b)으로 이루어지되, 상기 내부판(6)은 여러개의 장력스프링(7)으로 탄지되어 금속막(8)이 부착된 탄성스폰지(9)를 하부프레임(5)의 개방밑면(1) 쪽으로 부세시킴에 따라 측정자의 측정압력과 측정횟수에 관계없이 항상 일정한 면압으로 작용되어지는 발전기 고정자의 권선용 정전용량 측정프로브.A top plate 3 having a connecting pipe 2 for guiding the signal measuring cable 1, a box-shaped lower frame 5 to which the top plate 3 is fastened via a bolt 4, and the top plate ( 3) and an inner plate (b) embedded between the lower frame (5), wherein the inner plate (6) is supported by a plurality of tension springs (7) elastic sponge (9) attached with a metal film (8) A winding probe for winding of a generator stator which is always operated at a constant surface pressure regardless of the measuring pressure and the number of times of measurement by pushing) toward the open bottom (1) of the lower frame (5). 제 1항에 있어서, 상기 상기 상부판(3)의 연결관(2)을 통하여 연장되는 신호측정 케이블(1)은 내부판(6)의 금속막(8)에 연결되어 있으며, 이 금속막(8)은 알루미늄 재질의 금속막으로 형성된 것을 특징으로 하는 발전기 고정자의 권선용 정전용량 측정프로브.The signal measuring cable (1) extending through the connecting pipe (2) of the upper plate (3) is connected to the metal film (8) of the inner plate (6). 8) is a capacitance measuring probe for winding the generator stator, characterized in that formed of a metal film of aluminum material.
KR1020010065781A 2001-10-24 2001-10-24 Capacitance measurement probe for generator stator winding insulation KR20030033692A (en)

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Publication number Priority date Publication date Assignee Title
KR20160021526A (en) 2014-08-18 2016-02-26 한전케이피에스 주식회사 Probe apparatus for measuring deep part

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JPH09331656A (en) * 1996-03-05 1997-12-22 Toshiba Corp Inspection device using measuring element, arm device, and circumferential movement device which moves in circumferential direction on cylindrical face
JPH10177053A (en) * 1996-12-18 1998-06-30 Hitachi Ltd Degradation detection method and device for stator coil of rotary electric machine
JPH1172543A (en) * 1997-06-09 1999-03-16 General Electric Co <Ge> Method for mapping capacitance of stator bar insulator, and capacitance measurement instrument
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Publication number Priority date Publication date Assignee Title
US5546008A (en) * 1994-08-11 1996-08-13 General Electric Co. Inflatable capacitance measuring device
KR970013584A (en) * 1995-08-08 1997-03-29 니시무로 다이조 Capacitance measuring device for stator winding for electric rotary machines
JPH09331656A (en) * 1996-03-05 1997-12-22 Toshiba Corp Inspection device using measuring element, arm device, and circumferential movement device which moves in circumferential direction on cylindrical face
JPH10177053A (en) * 1996-12-18 1998-06-30 Hitachi Ltd Degradation detection method and device for stator coil of rotary electric machine
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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20160021526A (en) 2014-08-18 2016-02-26 한전케이피에스 주식회사 Probe apparatus for measuring deep part

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