KR102074863B1 - Ground location detecting device for detecting ground position of generator stator winding - Google Patents

Ground location detecting device for detecting ground position of generator stator winding Download PDF

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KR102074863B1
KR102074863B1 KR1020190166677A KR20190166677A KR102074863B1 KR 102074863 B1 KR102074863 B1 KR 102074863B1 KR 1020190166677 A KR1020190166677 A KR 1020190166677A KR 20190166677 A KR20190166677 A KR 20190166677A KR 102074863 B1 KR102074863 B1 KR 102074863B1
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South Korea
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stator winding
current
ground
detecting
winding
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KR1020190166677A
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Korean (ko)
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구성완
김영호
김기흥
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한전케이피에스 주식회사
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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
    • G01R31/34—Testing dynamo-electric machines
    • G01R31/346—Testing of armature or field windings
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
    • G01R19/165—Indicating that current or voltage is either above or below a predetermined value or within or outside a predetermined range of values
    • G01R19/16566—Circuits and arrangements for comparing voltage or current with one or several thresholds and for indicating the result not covered by subgroups G01R19/16504, G01R19/16528, G01R19/16533
    • G01R19/16571—Circuits and arrangements for comparing voltage or current with one or several thresholds and for indicating the result not covered by subgroups G01R19/16504, G01R19/16528, G01R19/16533 comparing AC or DC current with one threshold, e.g. load current, over-current, surge current or fault current
    • 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
    • G01R31/50—Testing of electric apparatus, lines, cables or components for short-circuits, continuity, leakage current or incorrect line connections
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K11/00—Structural association of dynamo-electric machines with electric components or with devices for shielding, monitoring or protection
    • H02K11/40—Structural association with grounding devices
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
    • H02P29/00—Arrangements for regulating or controlling electric motors, appropriate for both AC and DC motors

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Testing Of Short-Circuits, Discontinuities, Leakage, Or Incorrect Line Connections (AREA)

Abstract

The present invention provides a ground location detecting apparatus for detecting a ground location of a stator winding, which comprises: an input/output unit connected to the stator winding and a generator, and applying a current to the stator winding; a single winding transformer regulating a current flowing through the stator winding; a compound transformer preventing a trip of plant equipment while the current is applied from the input/output unit; a flexible ammeter measuring the current on a turbine side and an exciter side of the stator winding; and a ground determining unit determining that the current is grounded when the current measured from at least one of the turbine side or the exciter side is grounded is equal to or less than 0A or a certain level. When detecting the ground location, less economical and time-consuming effort so as to be convenient, and the detected ground location is more reliable.

Description

발전기 고정자 권선의 접지 위치를 검출하는 접지 위치 검출장치{GROUND LOCATION DETECTING DEVICE FOR DETECTING GROUND POSITION OF GENERATOR STATOR WINDING}A ground position detection device that detects the ground position of the generator stator winding. {GROUND LOCATION DETECTING DEVICE FOR DETECTING GROUND POSITION OF GENERATOR STATOR WINDING}

본 발명은 발전기 고정자권선의 접지위치를 검출할 수 있는 검출장치에 관한 것이다.The present invention relates to a detection device capable of detecting the ground position of the generator stator winding.

발전기는 크게 고정자 프레임, 고정자, 회전자, 여자기, 보조기기로 분류된다. 발전기 및 전동기는 용량에 따라 수십 또는 수백 개의 권선을 고정자 슬롯 내에 구비하고 있다. 발전기 고정자 권선은 상부 권선(Top Bar)과 하부 권선(Bottom Bar)으로 구성되며, 철심(Stator Core)에 삽입되어 여자기 및 터빈 측 각 끝단에서 전기적으로 연결되어 3상 회로를 구성하고 있다. 정상운전 시 회전자에서 발생된 자속(Flux)이 고정자 권선(Stator Bar)과 쇄교하여 기전력을 발생시키고, 부하전류가 발전기 단부(Terminal Bushing)를 통해 출력이 발생하게 된다. Generators are largely classified into stator frames, stators, rotors, exciters, and auxiliary devices. Generators and electric motors have dozens or hundreds of windings, depending on their capacity, in the stator slots. The generator stator winding consists of an upper winding (Top Bar) and a lower winding (Bottom Bar), and is inserted into an iron core (Stator Core) and electrically connected at each end of the exciter and turbine to form a three-phase circuit. During normal operation, the flux generated by the rotor crosses the stator bar to generate electromotive force, and the load current is generated through the terminal bushing.

고정자 권선은 용량 및 냉각 방식에 따라 공기 또는 수소로 냉각되는 간접 냉각 방식과 권선 내부로 직접 Gas 또는 액체를 흘려 냉각시키는 직접 냉각 방식으로 구분되며, 구조적으로 고정자 권선은 전기에너지 통로인 나동(Copper)부, 전기에너지에 의해 발생된 열을 냉각시키기 위한 냉각부, 그리고 정격전압에 견딜 수 있는 두꺼운 절연층으로 이루어져 있다.The stator winding is divided into the indirect cooling method, which is cooled by air or hydrogen, and the direct cooling method, through which gas or liquid flows directly into the winding, depending on the capacity and cooling method. Structurally, the stator winding is an electrical energy passage. It consists of a part, a cooling part for cooling the heat generated by electric energy, and a thick insulating layer that can withstand the rated voltage.

고정자 권선은 정상 운전 중 발생되는 전기적 진동, 기계적 진동 및 정지의 열 사이클에 의한 열화에 충분히 견딜 수 있는 충분한 절연내력을 가지고 있어야 한다. 또한, 고정자 권선은 운전 중 발생되는 전기적 진동 또는 기계적 진동에 대한 충분한 강성을 가져야 하고, 냉각수에 의한 화학적 부식 등에 의해 냉각수 누수가 발생되지 않아야 한다.The stator windings must have sufficient dielectric strength to withstand electrical vibrations, mechanical vibrations, and deterioration caused by thermal cycles during shutdown. In addition, the stator winding should have sufficient stiffness against electrical or mechanical vibrations generated during operation, and cooling water leakage should not occur due to chemical corrosion by cooling water.

그러나, 발전기의 비정상적인 운전이나 설계 불량, 주기적인 정비 미 수행으로 고정자 권선의 절연파괴가 일어날 수 있다. 절연파괴가 일어나면 고정자 권선의 접지가 발생하게 되는데, 이때 고장 위치를 신속하게 확인해야 한다. 그러나 발전기 고정자 권선의 접지가 발생하는 경우에 사용되는 전용 장비가 없어 시중의 일반 장비를 조합하여 접지의 위치를 검출하고 있다. 다만, 이렇게 시중의 일반 장비를 조합하여 사용하게 되면 장비를 구매하는데 많은 시간이 소요되고 장비의 신뢰성이 저하되어 안전사고가 발생할 수 있는 문제가 있다. However, the insulation breakdown of the stator winding may occur due to abnormal operation of the generator, poor design, or lack of periodic maintenance. When insulation breakdown occurs, grounding of the stator winding occurs. At this time, the location of the failure must be quickly confirmed. However, since there is no dedicated equipment used when the generator stator winding is grounded, the location of the ground is detected by combining general commercial equipment. However, if a combination of general equipment in the market is used in this way, it takes a lot of time to purchase the equipment, and the reliability of the equipment is deteriorated, which may cause a safety accident.

이에 본 출원인은, 보다 편리하고 정확하게 고정자 권선의 접지의 위치를 검출할 수 있는 검출 장치를 고안하였다.Accordingly, the applicant has devised a detection device that can more conveniently and accurately detect the position of the ground of the stator winding.

본 발명은 접지 위치 검출장치로서, 고정자 권선의 접지 위치를 편리하고 정확하게 검출할 수 있는 장치를 제공하고자 한다.The present invention is to provide a device capable of conveniently and accurately detecting the ground position of the stator winding as a ground position detection device.

상기 목적을 달성하기 위하여 본 발명은, 고정자 권선의 접지 위치를 검출하는 접지 위치 검출장치로서, 상기 고정자 권선 및 발전기에 연결되며, 상기 고정자 권선에 전류를 인가하는 입출력부; 상기 고정자 권선에 흐르는 전류를 조절하는 단권 변압기; 상기 입출력부에서 전류가 인가되는 도중에 플랜트 설비의 트립을 방지하는 복권 변압기; 상기 고정자 권선의 터빈측과 익사이터측의 전류를 측정하는 유연성 전류계; 및 상기 터빈측 또는 상기 익사이터측 중 적어도 어느 한 측에서 측정된 전류가 0A 또는 일정 수준 이하인 경우 접지된 것으로 판단하는 접지 판단부를 포함하는 것을 특징으로 한다.In order to achieve the above object, the present invention, a ground position detection device for detecting the ground position of the stator winding, connected to the stator winding and the generator, the input and output unit for applying a current to the stator winding; Single winding transformer for adjusting the current flowing in the stator winding; A lottery transformer that prevents a trip of a plant facility while a current is applied from the input / output unit; A flexible ammeter for measuring the current on the turbine side and the exciter side of the stator winding; And a ground determining unit determining that the current measured at least one of the turbine side or the exciter side is grounded when it is 0A or below a certain level.

본 발명에 따르면, 고정자 권선의 접지 발생 시 접지 위치를 검출할 수 있는 장치를 제공한다. 일반 장비의 조합이 아닌, 접지 위치 검출 전문 장비로서 장비구매에 많은 시간이 소요되지 않고, 장비의 신뢰성을 보장할 수 있는 장점을 갖는다. 또한, 개인의 경험 또는 판단으로 접지 위치를 판단하지 않으므로 신뢰할 수 있어 접지 위치에 대한 신뢰도를 담보할 수 있는 장점이 있다.According to the present invention, there is provided a device capable of detecting the ground position when the stator winding is grounded. It is not a combination of general equipment, but as a specialized equipment for detecting the ground position, it does not take much time to purchase equipment and has the advantage of ensuring the reliability of equipment. In addition, since the ground position is not determined by personal experience or judgment, it is reliable, and thus has the advantage of ensuring the reliability of the ground position.

도 1은 본 발명의 실시 예에 따른 접지 위치 검출장치의 회로도를 나타낸다.1 is a circuit diagram of a ground position detection device according to an embodiment of the present invention.

이하, 첨부된 도면들에 기재된 내용들을 참조하여 본 발명을 상세히 설명한다. 다만, 본 발명이 예시적 실시 예들에 의해 제한되거나 한정되는 것은 아니다. 각 도면에 제시된 동일 참조부호는 실질적으로 동일한 기능을 수행하는 부재를 나타낸다.Hereinafter, the present invention will be described in detail with reference to the contents described in the accompanying drawings. However, the present invention is not limited or limited by the exemplary embodiments. The same reference numerals in each drawing denote members that perform substantially the same function.

본 발명의 목적 및 효과는 하기의 설명에 의해서 자연스럽게 이해되거나 보다 분명해 질 수 있으며, 하기의 기재만으로 본 발명의 목적 및 효과가 제한되는 것은 아니다. 또한, 본 발명을 설명함에 있어서 본 발명과 관련된 공지 기술에 대한 구체적인 설명이, 본 발명의 요지를 불필요하게 흐릴 수 있다고 판단되는 경우에는 그 상세한 설명을 생략하기로 한다.The objects and effects of the present invention may be naturally understood or more apparent by the following description, and the objects and effects of the present invention are not limited only by the following description. In addition, in the description of the present invention, when it is determined that the detailed description of the known technology related to the present invention may unnecessarily obscure the subject matter of the present invention, the detailed description will be omitted.

도 1은 본 발명의 실시 예에 따른 접지 위치 검출장치(1)의 회로도를 나타낸다.1 is a circuit diagram of a ground position detecting device 1 according to an embodiment of the present invention.

접지 위치 검출장치(1)는 발전기, 대형 동기전동기, 고압전동기의 고정자 권선의 접지가 발생한 위치를 검출할 수 있다. 발전기 또는 전동기 고정자 권선의 접지 고장이 발생한 경우 단부권선은 육안으로 고장 위치를 확인할 수 있으나 고정자 코어 슬롯 내에 설치된 권선 직선 부위에 접지가 발생하면 육안으로 접지 발생 위치를 판단할 수 없어 접지 위치 검출장치(1)가 사용될 수 있다.The ground position detecting device 1 can detect the position where the ground of the stator winding of the generator, large synchronous motor, and high voltage motor occurs. In the event of a ground fault in the stator winding of the generator or motor, the end winding can visually check the location of the fault, but if ground occurs in the straight part of the winding installed in the stator core slot, the ground position detection device cannot be determined with the naked eye. 1) can be used.

접지 위치 검출장치(1)는 입출력부(10), 1차 전원(30), 2차 전원(50), 3차 전원(70), 유연성 전류계(90), 접지 판단부를 포함할 수 있다.The ground position detecting device 1 may include an input / output unit 10, a primary power supply 30, a secondary power supply 50, a tertiary power supply 70, a flexible ammeter 90, and a ground determination unit.

입출력부(10)는 고정자 권선 및 발전기에 연결되며, 고정자 권선에 전류를 인가할 수 있다. 고정자 권선은 U상, V상, W상으로 형성될 수 있으며, The input / output unit 10 is connected to the stator winding and the generator, and can apply current to the stator winding. The stator winding may be formed in a U phase, V phase, W phase,

입출력부(10)의 입력단자는 접지계전기 동작권선(고장권선)에 연결되고, 출력단자는 대지(Ground or Stator Core)에 연결될 수 있다. 본 발명의 실험예에서 입력단자는 0.5A의 전류를 고장권선에 인가시킬 수 있다. The input terminal of the input / output unit 10 may be connected to a ground relay operating winding (fault winding), and the output terminal may be connected to a ground or stator core. In the experimental example of the present invention, the input terminal can apply a current of 0.5A to the fault winding.

1차 전원(30)은 배선용 차단기(NFB), 전압계, 전류계, 파일럿 램프, 단권 변압기(501)를 포함할 수 있다. 입출력부(10)의 단자를 고정자 권선과 발전기 코어에 연결한 후, NFB를 투입하고, 전압계, 전류계, 파일럿 램프의 동작 상태를 확인하여 정상 작동 여부를 확인한다.The primary power supply 30 may include a circuit breaker (NFB), a voltmeter, an ammeter, a pilot lamp, and a single winding transformer 501. After connecting the terminals of the input / output unit 10 to the stator winding and the generator core, the NFB is input, and the operation status of the voltmeter, ammeter, and pilot lamp is checked to check whether it is operating normally.

2차 전원(50)은 단권 변압기(501), 전압계, 전류계를 포함할 수 있다.The secondary power supply 50 may include a single winding transformer 501, a voltmeter, and an ammeter.

단권 변압기(501)는 고정자 권선에 흐르는 전류를 조절할 수 있다. 고정자 권선이 접지되는 경우, 접지저항의 크기에 따라 대지(접지)로 흐르는 전류가 인가되는 전압의 크기에 따라 전류의 양이 변화하므로, 단권 변압기(501)를 이용하여 전압을 조정함으로써 전류를 조절할 수 있다.The single winding transformer 501 can adjust the current flowing through the stator winding. When the stator winding is grounded, the amount of current varies depending on the magnitude of the voltage applied to the ground (ground) according to the size of the ground resistance, so that the current is adjusted by adjusting the voltage using the single winding transformer 501 Can.

3차 전원(70)은 NFB, 복권 변압기(701), 전압계, 전류계, 파일럿 램프를 포함할 수 있다.The tertiary power supply 70 may include an NFB, a lottery transformer 701, a voltmeter, an ammeter, and a pilot lamp.

복권 변압기(701)는 입출력부(10)에서 전류가 인가되는 도중에 플랜트 설비의 트립을 방지할 수 있다. 복권 변압기(701)는 코어에 2개 이상의 권선이 감기고, 1차와 2차가 전기적으로 완전히 분리되어 있다. 따라서, 접지 위치 검출장치(1)는 복권 변압기(701)의 이러한 특징을 이용하여, 접지 위치 검출장치(1)에 사용되는 전원인 플랜트 설비의 트립이 접지 위치 확인 중에 발생하는 것을 방지하기 위해 사용될 수 있다. 본 발명의 실험예에서는 단권 변압기(501)가 0V 위치에서 3차 전원(70)의 NFB를 투입하고 3차 전원(70)의 전류계가 0.5A가 되도록 단권 변압기(501)를 조정할 수 있다. 이때, 1차 전원, 2차 전원 및 3차 전원의 전류계, 전압계, 파일럿 램프의 동작 상태를 확인하여 정상 작동 여부를 확인한다.The lottery transformer 701 can prevent the trip of the plant equipment while the current is applied from the input / output unit 10. In the lottery transformer 701, two or more windings are wound around the core, and the primary and secondary are completely electrically separated. Therefore, the ground position detecting device 1 utilizes this feature of the lottery transformer 701 to be used to prevent a trip of a plant facility, which is a power source used in the ground position detecting device 1, from occurring during ground position checking. Can. In the experimental example of the present invention, the single winding transformer 501 can be adjusted so that the NFB of the third power supply 70 is input at the 0V position and the ammeter of the third power supply 70 is 0.5A. At this time, check the operation status of the ammeter, voltmeter, and pilot lamps of the primary power supply, the secondary power supply, and the tertiary power supply to check whether they are operating normally.

유연성 전류계(90)는 3차 전원의 전류계가 0.5A인 상태에서 고정자 권선의 각 슬롯에 구비된 터빈측과 익사이터측에 각각 설치될 수 있고, 고정자 권선의 각 터빈측과 익사이터측의 전류를 순차적으로 측정할 수 있다. The flexible ammeter 90 may be installed on the turbine side and the exciter side provided in each slot of the stator winding while the ammeter of the tertiary power is 0.5 A, and the current on each turbine side and the exciter side of the stator winding may be provided. Can be measured sequentially.

접지 판단부는 터빈측 또는 익사이터측 중 적어도 어느 한 측에서 측정된 전류가 0A 또는 일정 수준 이하인 경우 접지된 것으로 판단할 수 있다. 본 발명의 실험예에서는 측정된 전류가 0A 또는 0.5A인 경우 접지코일로 판단할 수 있다. 0.5A 등의 접지 여부를 판단하는 기준인 ‘일정 수준’은 본 발명의 실험에서 사용된 유연성 전류계(90)의 종류에 따라 결정될 수 있다.The ground determination unit may determine that the current measured at least one of the turbine side or the exciter side is 0A or below a certain level, and is grounded. In the experimental example of the present invention, when the measured current is 0A or 0.5A, it can be determined as a grounding coil. The "constant level", which is a criterion for determining whether or not to ground 0.5A, may be determined according to the type of the flexible ammeter 90 used in the experiment of the present invention.

이상에서 대표적인 실시예를 통하여 본 발명을 상세하게 설명하였으나, 본 발명이 속하는 기술 분야에서 통상의 지식을 가진 자는 상술한 실시예에 대하여 본 발명의 범주에서 벗어나지 않는 한도 내에서 다양한 변형이 가능함을 이해할 것이다. 그러므로 본 발명의 권리 범위는 설명한 실시예에 국한되어 정해져서는 안 되며, 후술하는 특허청구범위뿐만 아니라 특허청구범위와 균등 개념으로부터 도출되는 모든 변경 또는 변형된 형태에 의하여 정해져야 한다. Although the present invention has been described in detail through exemplary embodiments above, those skilled in the art to which the present invention pertains understand that various modifications are possible within the limits of the embodiments described above without departing from the scope of the present invention. will be. Therefore, the scope of rights of the present invention should not be limited to the described embodiments, but should be determined by any modified or modified form derived from the claims and equivalent concepts as well as the claims described below.

1: 접지 위치 검출장치
10: 입출력부
30: 1차 전원
50: 2차 전원
501: 단권 변압기
70: 3차 전원
701: 복권 변압기
90: 유연성 전류계1: Ground position detection device
10: input and output unit
30: primary power
50: secondary power
501: single winding transformer
70: tertiary power
701: Lottery transformer
90: flexible ammeter

Claims (1)

고정자 권선의 접지 위치를 검출하는 접지 위치 검출장치로서,
상기 고정자 권선 및 발전기에 연결되며, 상기 고정자 권선에 전류를 인가하는 입출력부;
상기 고정자 권선에 흐르는 전류를 조절하는 단권 변압기;
상기 입출력부에서 전류가 인가되는 도중에 플랜트 설비의 트립을 방지하는 복권 변압기;
상기 고정자 권선의 터빈측과 익사이터측의 전류를 측정하는 유연성 전류계; 및
상기 터빈측 또는 상기 익사이터측 중 적어도 어느 한 측에서 측정된 전류가 0A 또는 일정 수준 이하인 경우 접지된 것으로 판단하는 접지 판단부를 포함하는 것을 특징으로 하는 접지 위치 검출장치.
A ground position detecting device for detecting the ground position of the stator winding,
An input / output unit connected to the stator winding and the generator and applying current to the stator winding;
Single winding transformer for adjusting the current flowing in the stator winding;
A lottery transformer that prevents a trip of a plant facility while a current is applied from the input / output unit;
A flexible ammeter for measuring the current on the turbine side and the exciter side of the stator winding; And
And a ground determination unit determining that the current measured at least one of the turbine side or the exciter side is grounded when the current measured is 0 A or less than a certain level.
KR1020190166677A 2019-12-13 2019-12-13 Ground location detecting device for detecting ground position of generator stator winding KR102074863B1 (en)

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Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6358271A (en) * 1986-08-29 1988-03-14 Kawasaki Steel Corp Grounding position detecting method for winding of alternating-current equipment
WO1996015580A1 (en) * 1994-11-15 1996-05-23 Sundstrand Corporation Starter/generator system and method utilizing a low voltage source
KR20050008205A (en) * 2003-07-14 2005-01-21 두산중공업 주식회사 Circuit and Method of Testing a Stator Core in the Power Generator
US20160372912A1 (en) * 2015-06-18 2016-12-22 General Electric Company System and method for isolating ground faults in a wind turbine

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6358271A (en) * 1986-08-29 1988-03-14 Kawasaki Steel Corp Grounding position detecting method for winding of alternating-current equipment
WO1996015580A1 (en) * 1994-11-15 1996-05-23 Sundstrand Corporation Starter/generator system and method utilizing a low voltage source
KR20050008205A (en) * 2003-07-14 2005-01-21 두산중공업 주식회사 Circuit and Method of Testing a Stator Core in the Power Generator
US20160372912A1 (en) * 2015-06-18 2016-12-22 General Electric Company System and method for isolating ground faults in a wind turbine

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