KR20000016096A - 전기모터를 구비한 고압설비_ - Google Patents
전기모터를 구비한 고압설비_ Download PDFInfo
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- KR20000016096A KR20000016096A KR1019980709663A KR19980709663A KR20000016096A KR 20000016096 A KR20000016096 A KR 20000016096A KR 1019980709663 A KR1019980709663 A KR 1019980709663A KR 19980709663 A KR19980709663 A KR 19980709663A KR 20000016096 A KR20000016096 A KR 20000016096A
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
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- H02K15/00—Methods or apparatus specially adapted for manufacturing, assembling, maintaining or repairing of dynamo-electric machines
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60M—POWER SUPPLY LINES, AND DEVICES ALONG RAILS, FOR ELECTRICALLY- PROPELLED VEHICLES
- B60M3/00—Feeding power to supply lines in contact with collector on vehicles; Arrangements for consuming regenerative power
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- H01B7/00—Insulated conductors or cables characterised by their form
- H01B7/02—Disposition of insulation
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- H01F27/32—Insulating of coils, windings, or parts thereof
- H01F27/323—Insulation between winding turns, between winding layers
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- H01F3/14—Constrictions; Gaps, e.g. air-gaps
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- H—ELECTRICITY
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- H02K11/04—Structural association of dynamo-electric machines with electric components or with devices for shielding, monitoring or protection for rectification
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- H02K3/46—Fastening of windings on the stator or rotor structure
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- H01F2029/143—Variable transformers or inductances not covered by group H01F21/00 with variable magnetic bias with control winding for generating magnetic bias
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- H02K1/06—Details of the magnetic circuit characterised by the shape, form or construction
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Abstract
절연된 도선이 구비되고, 절연된 도선을 경유하여 과전류용으로 연결되는 하나 또는 그이상의 전기기계들로 구성된 설비에서, 이들 전기기계들 중 적어도 하나에서의 자기회로는 20 ∼800kV, 바람직하게는 36kV이상의, 고압공급전압에 직접 연결된다. 전기기계의 절연부는 권선부에 배치된 케이블로 이루어지며, 케이블은, 외측과 내측의 반도체층(32,34)들 및 중간 절연층(33)으로 둘러싸이고 다수의 소선들(36)을 가지는 하나 또는 그 이상의 전류운반(current-carrying) 도선(31)으로 구성된다.
도선들(31)은 그룹방식으로(group-wise) 병렬 연결되고, 따라서 그룹단위 모든 도선 주위에 반도체층들이 요구되지 안는다.
만일, 도선들(31)이 그룹내에서 상호 직렬연결 된다면, 수(a few) kV를 견뎌낼 부분절연부(35)가 요구되며, 한편 도선들(31)의 각 상으로의(to every phase) 연결은 고전압공급네트워크의 위상전압을 견뎌낼 강력한 부분 절연부(35)를 필요로 한다.
Description
전기모터의 자기회로는 용접구조로 되고 예를 들어, 강판으로 된 적층철심을 구비하고 있는 것이 보통이다. 환기와 냉각을 위해, 적층철심은 방사상의 그리고/또는 축주위로 향하는 환기덕트를 구비한 스택(stacks)들로 나뉜다. 보다 큰 모터의 경우에는 적층물(laminations)이 세그멘트로 펀칭되어(punched out) 기계의 프레임에 부착되며, 적층철심은 압축핑거와 압축링에 의해 함께 지지된다. 권선은 적층철심의 슬롯홈(slot)에 배치되며, 슬롯홈들은 장방형 또는 사다리꼴 형상의 단면을 가지는 것이 보통이다. 다상(multi-phase) 전기모터에 있어서, 권선은 단층 또는 복층권선으로 만들어진다. 단층권선에 있어서는, 슬롯홈마다 단 하나의 코일변(coil side)이 있고, 그 반면 다층권선에 있어서는, 슬롯홈마다 코일변이 둘이 있다. 코일변은 수직 또는 수평으로 결합되고, 공통코일절연부, 예를 들어 모터의 접지에 대한 정격전압을 견딜 수 있도록 설계된 절연부가 구비된 하나 또는 그 이상의 도선을 의미한다.
복층권선은 다이아몬드권선으로 만들어지는 것이 일반적이고, 그 반면 이건 출원의 단층권선은 다이아몬드권선 또는 평형(flat)권선으로 만들어질 수 있다. 다이아몬드권선에서는 단 하나(둘도 가능)의 코일폭(coil width)이 존재하고, 그 반면 평형권선은 동심권선, 예를 들어 폭 넓게 다양한 코일폭을 가지도록 만들어진다. 코일폭이란, 동일한 코일에 관한 2개의 코일변 사이의 아크 치수(arc dimension)내의 거리를 의미한다.
모든 대형 모터는 다층권선과 동일 크기의 코일로 만들어지는 것이 보통이다. 각 코일은 일측이 하나의 층에 그리고 타측이 다른 층에 위치하게 된다. 이것은 모든 코일이 코일단부에서(in the coil end) 서로 교차하는 것을 의미한다. 2개층 이상이 있으면, 이들 교차점이 권선작업을 복잡하게 하고 코일단부가 덜 만족스럽다.
회전 전기모터용 코일은 10∼20kV에 이르기까지의 범위에서 좋은 결과를 갖도록 제조될 수 있는 것으로 생각된다.
대형 교류모터는 동기모터와 비동기모터로 나뉘며, 동기모터는 수십 MW에 이르는 범위의 보다 높은 전력을 커버하는 것이 일반적이고, 보통 최대로 20kV의 전압이 공급되는 구조로 되어 있다. 동기모터는 네트워크 주파수와 동기를 이루는 회전자속도로 동작한다. 비동기모터에 있어서, 유기전류가 회전방향으로 회전력(torque)을 내도록, 자계가 회전자보다 빠르게 회전한다. 모터의 두 형태는 그 구조에 있어서 매우 유사하다. 그들은 하나의 고정자와 그 고정자내에 위치한 하나의 회전자로 되어 있다. 고정자는, 권선용으로 펀칭된 슬롯홈을 가지는 적층철심으로 만들어진다. 고정자는 기초부에 다리부에 의해 부착된 하부박스내에 위치한다. 회전자는 하부박스에 장착된 베어링에 걸쳐져 있다. 고정자 덮개(shell)는, 동작부품을 보호하기 위하여 하부박스위에 위치한다. 고정자덮개에는 인입공기를 냉각시키기 위해 개구부가 만들어져 있다.
교류모터의 기능은, 자계, 전류 및 기계적 동작의 상호작용에 기초한 것이다. 자계는 주로 기계의 철부분(iron)에서 점측정되고(localized), 전류는 권선에서 점측정된다.
교류모터는 동기기(synchronous machine)와 비동기기의 2개의 주된 형태로 구분된다. 동기기와 비동기기사이의 주된 차이점은 어떻게 회전력이 생기는가에 있다. 동기모터는 브러시레스 여자기(brushless exciters) 또는 슬립 링을 거쳐 외부로부터 회전자에 에너지를 공급함으로써 여자되고, 그 반면 비동기모터는 그 여자에너지를 유도작용을 통해 고정자 전류로부터 얻는다. 동기모터의 속도는 비동기모터에 있어서와 달리 부하에 의존하지 않는다.
회전자의 구조에 따라, 동기모터에는 두가지 형태가 있으며, 돌극(salient poles)을 가진 것과 원통형 회전자를 가진 것이 그것이다. 고속 양극동작에 있어서, 회전자의 기계적 응력이 매우 높게 되고, 그 경우 원통형 회전자를 사용하는 것이 바람직하다. 보다 낮은 속도의 모터의 경우, 4극 또는 그 이상이면 회전자의 직경은 더 커지게 된다. 낮은 속도와 그에 따른 낮은 기계적 응력의 관점에서, 회전자는 돌극을 가지는 것이 더 바람직하다.
두 형태 사이의 경계는 확실치 않다. 보다 높은 전력에서 그리고 4극을 가진 경우, 원통형 회전자가 사용되는데, 길고 가느다란 형상으로 되어 있다. 보다 낮은 전력에서 그리고 4극을 가진 경우, 돌극을 가진 회전자가 사용된다.
비동기모터도 또한 농형유도모터(squirrel-cage induction motor)와 슬립링모터의 두 형태로 나뉜다. 두 형태에 공통된 것은, 회전자가 회전자권선용 슬롯홈을 가진 적층물로 만들어진다는 것이다. 그 차이점은 권선의 구조에 있다. 농형유도모터는, 단락 링(a short-circuiting ring)과 그 단부에서 단락되는, 축봉(axial rods)들로 이루어진 농형권선을 가진다. 슬립링을 구비한 비동기모터는 슬립링에 연결된 위상 터미날을 가진 회전자내의 3상 권선을 가진다.
회전자 슬롯홈을 여러 가지 방법으로 설계함으로써, 농형유도모터의 시동 및 동작특성을 여러 가지 운전조건에 맞출 수 있다. 슬립링 비동기모터는 어려운 시동상태에서 주로 사용된다. 외부저항이 슬립링을 통해 연결될 수 있다. 회전자의 저항을 증가시킴으로써, 최대회전력을 더 낮은 속도쪽으로 옮겨서, 시동회전력을 증가시킬 수 있다. 시동이 끝나면, 외부 시동저항은 단락된다.
형태, 네스팅 클래스(nesting class) 및 냉각방법과 관련하여 대형교류모터를 선택함에 있어서는 여러 가지 사항중 다음 요소에 따른다;
· 부하의 회전력특성
· 부하와 부하 사이클의 형태
· 네트워크 특성
· 전기 에너지의 원가
· 모터가 설치되는 환경
· 설비의 예상수명과 관련한 투자비용
전기기계에 대하여 주로 기대하는 것은 자본비와 운전비가 가능한 한 낮아야 한다는 것이다. 그러므로, 주어진 전력요소에 대하여 효율을 가능한 한 높게 유지하는 것이 바람직하다. 동기모터가 비동기모터보다 높은 효율을 갖는 것이 일반적이다.
동기모터의 회전자는 돌극을 구비하도록 제조되는 경우가 많다. 그 주된 용도는, 1MW에서 수십 MW까지의 전력범위로서, 그 예로는 제지업의 연마기와 정쇄기(refiner), 장치산업에 있어서나 취약네트워크(weak networks)와 관련된 대형펌프, 사막국가의 관개설비 등에 있다. 석유산업도 펌프와 콤프레서에 대형 동기모터를 사용한다.
덜 비싼 비동기모터대신에 동기모터를 사용하는 주된 이유는, 낮은 시동전류의 형태로, 네트워크에 보다 적은 응력을 발생시키는 것, 그리고 과여자상태에서 동기모터는 역률(power factor)을 개선하기 위해 사용될 수 있다는 것이다. 대형 동기모터는 동급 비동기모터보다 약간 더 높은 효율을 낼 수도 있다.
권선은, 코일의 권회선(winding turns)사이 그리고 또한 코일과 그 주위사이에 모두 절연이 시행되어야 한다. 여러 가지 형의 플라스틱, 바니쉬 및 유리섬유재가 절연재로 많이 사용된다. 코일단부는, 여러 가지 코일들 사이, 특히 단락에 나타나는 힘을 상쇄하기 위해 떠받쳐진다.
상술한 형태의 모터는, 전압을 낮추는 변압기의 사용과정에서, 예를 들어 145kV의 고전압네트워크에 연결된다. 이렇게 변압기를 통해 모터를 고전압네트워크에 연결하여 사용함으로써, 많은 결점이 수반된다. 그들중에는 다음과 같은 결점이 있을 수 있다.
· 변압기는 고가이고, 운송비를 증가시키며, 점유공간을 필요로 한다.
· 변압기가 시스템의 효율을 저하시킨다.
· 변압기가 무효전력을 소모시킨다.
· 종래의 변압기에는 오일이 들어 있고, 그에 따른 위험이 있다.
· 변압기가 모터를 거쳐 보다 취약한 네트워크에 작용하므로 민감한 운전상의 문제가 있다.
본 발명은 아래에서 전력네트워크라고 부를, 배전 또는 송전네트워크에 연결하기 위해 모터를 포함하여 이루어진 전기설비에 관한 것이다. 그리고, 본 발명은 그러한 설비에 사용하기 위한 모터에 관한 것이기도 하다. 그러한 모터들은 동기모터일 수도 있고 비동기모터일 수도 있다.
전기모터를 구비한 설비는 압연기, 제지기, 펄프건조기, 광산설비, 안벽구조(quay structure), 팬(fan), 펌프 또는 압축기시스템, 권상기(hoisting means), 트래버스(traverse), 크레인, 원심분리기, 콘베어, 공작설비, 스틸 밀(steel mills)등이 있다. 전기모터를 구비한 설비는 따라서 가장 넓은 의미로 해석되어야 한다.
본 발명을 설비내의 전기모터의 자기회로의 구조의 바람직한 실시예에 의해 첨부도면을 참고로 아래에 상세히 설명하기로 한다.
첨부도면에 있어서,
도 1은 본 발명에 의한 설비의 전기모터의 고정자의 하나의 섹터의 개략적인 축방향 단면도(axial end view)이고,
도 2는 도 1의 고정자의 권선부에 사용된 케이블을 계단식으로 벗겨낸 단면도이며,
도 3∼7은 공지된 상이한 시동회로의 예를 도시한 것이다.
바람직한 실시예의 상세한 설명
본 발명의 설비에 포함된 전기모터(들)에 관한, 고정자(1)의 하나의 섹터의 개략적인 단면도인 도 1에 있어서, 모터의 회전자(2)도 또한 도시되어 있다. 고정자(1)는 적층철심에 의해 통상적인 방법으로 구성된다. 도 1은 단극피치에 상응하는 모터의 하나의 섹터를 보여준다. 방사상으로 가장 바깥쪽에 위치한 철심의 요크부(3)로부터, 다수의 치형(4)이 회전자(2)를 향해 내측으로 연장되어, 고정자 권선이 배치되는 슬롯홈(5)들에 의해 격리되어 있다. 이러한 고정자 권선을 이루는 케이블(6)들은 배전용으로 사용되는 것들과 실질적으로 동일한 형태일 수도 있는 고전압케이블들, 즉 PEX 케이블이다. 하나의 차이점은, 본 출원의 케이블이 오로지 도선 그리고 적어도 하나의 절연층의 각 측면위의 적어도 하나의 반도체층(semi-conducting layer)만으로 구성되도록, 외측의 기계적 보호를 위한 피복 그리고 일반적으로 배전케이블을 둘러싼 금속스크린이 제거된다는 것이다. 그리하여, 기계적 손상에 민감한 반도체층이 케이블의 표면에 그대로 노출되어 있다.
케이블(6)들은 도 2에 개략적으로 도시되어 있어서, 코일변 또는 각 케이블부의 전도성 중앙부만이 도시되어 있다. 도시된 바와 같이, 각 슬롯홈(5)은 광폭부(7)와 협소부(8)가 번갈아 있는, 다양하게 변하는 단면을 가진다. 광폭부(7)는 대체로 원형이고 케이블면피복선(cabling), 즉 협소부(8)를 형성하는 중간부의 웨이스트부를 둘러싼다. 웨이스트부는 각 케이블의 위치를 방사상으로 고정시키는 역할을 한다. 슬롯홈(5)의 단면은 내측으로 방사상으로 좁아진다. 이것은 케이블부의 전압이 낮으면 낮을 수록 케이블부가 고정자(1)의 방사상인 내측부에 더욱 가깝게 위치하기 때문이다. 그러므로 좀더 가느다란 케이블면 피복부가 그곳에 사용될 수 있고, 그 반면에 좀더 성긴 케이블면피복부가 그 바깥쪽에 필요하다. 도시된 예에 있어서, 3가지 서로 다른 치수의 케이블이 사용되는데, 3개의 상응한 치수를 가진 구획부(51, 52, 53)가 슬롯홈(5)에 만들어져 있다.
도 2는 본 발명에 의한 전기모터에 사용되는 고전압 케이블을 계단식으로 벗겨낸 단면도를 나타낸 것이다. 고전압케이블(6)은 하나 또는 그 이상의 도선(31)으로 이루어지고, 각 도선은 다수의 소선(36)을 가지며, 소선은 예를 들어 구리로 만들어지고 함께 하나의 원형 단면을 형성한다. 이들 도선(31)은 고전압케이블(6)의 중앙부에 배치되고, 도시된 실시예에서 개별절연부(part insulation ; 35)에 의해 둘러싸여 있다. 그러나, 개별절연부(35)는 도선(31)중 하나에는 생략하는 것이 적합하다. 본 발명의 이러한 실시예에 있어서, 도선(31)들은 함께 제1 반도체층(32)으로 둘러싸여 있다. 이 제1 반도체층(32)의 주위에, 예를 들어 PEX절연체로 된, 하나의 절연층(33)이 있고, 이 절연층은 다시 제2 반도체층(34)으로 둘러싸여 있다. 그리하여, 본 출원에 있어서의 "고전압케이블"이라는 개념은 배전용 케이블을 일반적으로 둘러싸는 그러한 형태의 외장 또는 금속스크린을 포함할 필요가 없다.
기초 다이아그램형태의 도 3∼7은 본 발명에 의한 회전모터에 적용할 수 있는 공지의 시동순서의 예를 도시한 것이다. 그 도면에서 사용되는 부호는 아래와 같다.
U : 고전압네트워크 Xt : 변압기 임피던스
Xn : 네트워크 임피던스 R : 리액터
B : 차단기 Xr : 리액터 임피던스
M : 모터 C : 캐패시터
Xm : 모터 임피던스 Xc : 캐패시터 임피던스
T : 변압기 L : 3상 고정자 권선
따라서 도 3은 변압기시동과정(procedure for transformer start), 도 4는 리액터시동과정, 도 5는 부분권선(part-winding)시동과정, 도 6은 캐패시터시동과정, 도 7은 리액터와 캐패시터 결합시동과정에 관한 것이다. 본 발명에 의한 설비에는 시동과정을 달리 결합하는 것도 가능하다. 여러 가지 시동과정이 문헌들, 예를 들어 본 출원의 도입부에 언급된 인용문헌에 기술되어 있다.
따라서, 본 발명에 따라 구성된 하나 또는 그 이상의 회전전기모터에 의해, 하나 또는 그 이상의 그러한 모터를 포함하여 구성된 산업설비가 직접 고전압공급네트워크, 즉 20kV 또는 그 보다 높은 공급전압을 가지는 네트워크에 접속될 수 있고, 그에 따라 적어도 하나의 변압기를 제거할 수 있게 해준다.
본 발명에 의한 영구절연전력케이블을 설비에 포함된 전기모터들 사이에 사용하고 그리고 이들 모터를 콤팩트하게 설치함으로써(compact siting) 전계가 작고 붓싱/단자들을 완전히 없앨 수 있게 해준다.
본 발명의 하나의 목적은, 하나 또는 그 이상의 전기모터를 고전압공급네트워크에 직접 연결된 설비에 사용할 수 있도록 하는 것이며, 여기서 직접 연결이라 함은 변압기가 중간에 연결되지 않은 부차적 송전(sub-transmission) 및 배전 네트워크를 의미한다.
위와 같은 목적을 달성함으로써 얻어지는 이익은, 그 리액턴스가 무효전력을 소모하는 오일충전 변압기를 중간에 설치할 필요가 없게 된다는 것이다.
이 목적은, 본 발명에 의해 특허청구의 범위 제1항의 도입부에 기술된 형태의 설비에 동 청구항의 특징부에 정의되어 있는 특수한 특징이 부여됨으로써, 그리고 특허청구의 범위 제25항의 도입부에 기재된 형태의 전기모터에 동 청구항의 특징부에 정의된 특수한 특징이 부여됨으로써 달성된다.
특별히 만들어진 고체절연부에 힘입어, 그러한 설비내의 모터에는 공지기술을 사용하여 가능한 것을 상당히 초과하는 전압레벨, 그리고 고전압전력네트워크용으로 인가 가능한 최고전압까지 도달할 수 있는 전압이 직접 공급될 수 있다.
따라서, 변압기가 불필요하게 되고 그에 따라 전압이 강하되어야 하는 설비에 불가피하게 수반되는 상술한 모든 문제가 제거되는 이점, 기타 다른 중요한 이점이 얻어진다. 본 발명에 의한 설비에 있어서, 과부하용량이 또한 급격히 증가된다. 이것은 1시간 또는 2시간에 +100%가 될 수 있어서, 정격출력이 보다 낮은 모터를 선택할 수 있게 되며, 비용 또한 절약된다.
출력이 전압의 제곱에 비례하므로, 모터에 높은 전압을 공급함으로써 보다 높은 출력을 얻을 수 있기도 하다. 따라서 본 발명은 전기모터가 보다 높은 전력을 갖도록 할 수 있게 해준다. 그에 따라, 본 발명은 1∼300MW 범위까지의 전기기계에 적용범위를 넓일 수 있고, 휠씬 높은 전력레벨까지 적용할 수도 있다.
본 발명에 의한 실시예와 공지기술사이의 가장 크고 필수적인 차이점은 적어도 하나의 전기모터에 포함된 자기회로에 의해 성취되는 것으로서, 그 전기모터는 차단기와 아이솔레이터(isolators)와 같은 결합요소를 거쳐 높은 공급전압에 직접 연결되도록 구성되어 있는 것이다. 자기회로는 그리하여, 하나 또는 그 이상의 적층철심을 포함하여 구성된다. 권선부는 도선 그리고 절연부 외측 모두에 하나의 반도체 층(semiconducting layer)을 가지는 하나 또는 그 이상의 영구절연도선을 가지는 하나의 쓰레드 케이블(threaded cable)을 포함하여 이루어지며, 외측반도체층은 지전위에 연결된다.
회전 및 스태틱(static) 모터등 전기모터를 모든 형태의 고압전력네트워크와 직접 연결하는데 따라 발생하는 문제점을 해결하기 위해 본 발명에 의한 설비내의 적어도 하나의 모터는 위에 설명한 바와 같이 공지기술과 상이한 여러 가지 특징을 가진다. 본 발명의 다른 특징과 실시예는 종속항에 정의되어 있으며 아래에 설명한다.
본 발명에 의한 설비와 거기에 포함된 모터들중 적어도 하나의 상기 특성과 기타의 본질적인 특성은 아래와 같다;
· 권선은 도선과 피복(sheath) 모두에 하나의 반도체 층을 가지는, 하나 또는 그 이상의 영구절연도선을 가지는 케이블로 만들어진다. 이러한 형태의 몇몇 전형적인 도선들은 PEX(crosslinked polyethylene) 케이블이거나 EP(ethylene propylene) 고무절연 케이블이지만, 이들은 본 발명의 목적을 위해 도선내의 소선(strands) 및 외장(outer sheath)의 성질 모두에 관하여 더 발전되었다.
·원형단면을 가지는 케이블이 바람직하지만, 다른 단면을 가지는 케이블들도, 예를 들어 보다 나은 충전밀도(packing density)를 얻기 위해 사용될 수도 있을 것이다.
· 그러한 케이블은 적층철심으로 하여금 본 발명에 따라 슬롯홈과 치형(tooth)에 관해 새롭고 적정한 방법으로 설계될 수 있게 해준다.
· 권선부는 적층철심의 최대 이용을 위해 여러겹의 절연부를 갖도록 제조되는 것이 바람직하다.
· 권선부는 다층구조의(multi-layered) 동심케이블권선으로 함으로써 코일단부 교차점(coil-end intersections)의 수를 줄일 수 있도록 제조하는 것이 바람직하다.
· 슬롯홈들은 축주위로 그리고/또는 각각 밖으로 방사상으로 뻗어 있고 고정자권선의 층 사이에 형성된 하나의 개방 웨이스트(open waist)를 가진 몇 개의 원통형 개구부의 형태를 갖도록, 권선케이블의 단면에 적합하게 설계된다.
· 슬롯홈의 디자인은 해당 케이블 단면과 계단형 권선절연층에 맞추어진다. 계단형 절연층은, 방사상 연장부와는 관계없이, 자기철심이 실질적으로 변함없는 치형폭을 갖도록 해준다.
· 소선에 관하여 상술한 바와 같이 더 이루어진 발전으로 인해, 권선도선들이 수개의 조밀하게 매입된(impacted) 층을 가지게 되는데, 전기기계의 관점에서 절연소선들은 절연소선 그리고/또는 비절연소선과 반드시 교차 되어야(transposed) 하는 것은 아니다.
· 외장에 관하여 상술한 바와 같이 이루어진 발전은, 도선부의 길이방향의 적당한 곳에서, 외장이 절단되어 각 절단된 부분의 길이가 직접 지전위에 연결된 상태를 수반한다.
상술한 형태의 케이블을 사용함으로써 권선부의 외장의 전체길이가, 설비의 다른 부분들과 마찬가지로, 지전위로 유지될 수 있도록 한다. 중요한 이점은 외측의 반도체 층 밖의 코일단부구역내에서 전계가 0에 가깝다는 것이다. 외장의 지전위로 인해, 전계는 제어될 필요가 없다. 이것은 코일내에서나, 코일단부구역내에서나 그들 사이의 천이부분(transition)에서 전혀 전계집중(field concentrations)이 일어나지 않을 것임을 의미한다.
절연된 그리고/또는 절연되지 않은 조밀매입소선들 또는 번갈아 위치한 소선들의 혼합으로 인해 낮은 표유손실(stray losses)이 생긴다.
권선부내에 사용된 고전압용 케이블은 복수의 소선들을 가지는 하나의 내부철심/도선, 적어도 2개의 반도체 층으로 구성되는데, 가장 내측에 있는 내부철심/도선은 하나의 절연층으로 둘러싸이고, 그것은 다시 10∼250㎜정도의 외경과 40∼3,000㎟정도의 도선영역(conductor area)을 가지는 반도체 층의 외층에 의해 둘러싸여 있다.
본 발명에 의한 설비의 모터중 적어도 하나가 설명된 방식으로 구성되면, 이 모터(들)의 시동 및 제어는, 도입부에 기재된 문헌에 예를 드는 방법으로 설명되어 공지된 시동방법들에 의해 이루어질 수 있다.
본 발명의 특히 바람직한 실시예에 의하면, 바람직하게는 반도체층의 3개층 모두, 적어도 2개층이 동일한 열팽창계수를 가진다.
권선내의 열의 이동(thermal movement)중에 결합, 틈새 및 그와 유사한 것이 회피될 수 있다는 결정적인 이익이 이렇게 얻어진다.
본 발명의 다른 중요한 바람직한 실시예에 의해, 설비내의 적어도 하나의 모터는 하나 또는 그 이상의 접속전압(connection voltages)을 갖는다.
본 발명의 다른 측면에 의해, 특허청구의 범위 제23항의 도입부에 기술된 형태의 설비에 동 청구항의 특징부에 정의된 특수한 특성들이 부여됨으로써, 본 발명의 목적이 성취되었다.
영구적인 것이 적당한 절연시스템이 열적, 그리고 전기적 관점에서, 36kV이상에 맞는 치수를 갖도록 설계되어 있으므로, 중간에 강압변압기를 개재시키지 않은 상태로 본 발명의 설비가 고전압 전력네트워크에 연결될 수 있고, 그에 따라 본 발명의 이점이 성취된다. 그러한 설비는, 특허청구범위 제1항∼제22항의 어느 하나에 특허청구된 설비에 대하여 정의된 특성(features ; 또는 “구성부”)들을 포함하여 구성되는 것이 필수적이지는 않지만 바람직하다.
상술한 그리고 기타 다른 이점을 가지는 본 발명의 실시예들은 종속항에 정의되어 있다.
Claims (28)
- 각각 적어도 하나의 권선부를 포함하는 하나 또는 그 이상의 모터로 구성된 것으로서 ; 모터들의 적어도 하나의 권선부는 각층이 본질적으로 동전위표면으로 구성된 적어도 2 개층의 반도체층과, 그 반도체층들 사이의 중간고체절연부를 포함하여 구성된 것을 특징으로 하는, 고전압용 전기설비.
- 제1항에 있어서, 적어도 하나의 모터가 하나 또는 그 이상의 접속전압을 갖는 것을 특징으로 하는, 고전압용 전기설비.
- 제1항 또는 2항에 있어서, 적어도 하나의 반도체층은 고체절연부와 같은 열팽창계수를 갖는 것을 특징으로 하는, 고전압용 전기설비.
- 제1항 내지 제3항의 어느 한 항에 있어서, 모든 전압의 실질적인 변압이 동일한 전기모터에서 발생하는 것을 특징으로 하는, 고전압용 전기설비.
- 제1항 내지 제4항의 어느 한 항에 있어서, 권선부가 하나의 고전압용 케이블(6)을 포함하여 이루어지고, 그 케이블은 고체 절연부로 된 중간 절연층(33)을 가지는 적어도 두 개의 반도체층(32,34)으로 둘러싸인 하나 또는 그 이상의 전류운반(current-carrying) 도선(31)들을 포함하여 구성된 것을 특징으로 하는, 고전압용 전기설비.
- 제5항에 있어서, 가장 내측의 반도체층(32)이 도선(31)(들)과 거의 동일한 전위를 갖는 것을 특징으로 하는, 고전압용 전기설비.
- 제5항 또는 제6항의 어느 한 항에 있어서, 외측 반도체층(34)의 하나가 도선(31)(들)로 둘러싸인 등전위표면을 본질적으로 형성하도록 배치된 것을 특징으로 하는, 고전압용 전기설비.
- 제7항에 있어서, 상기 외측 반도체층(34)이 예정된(predefined) 전위에 연결된 것을 특징으로 하는, 고전압용 전기설비.
- 제8항에 있어서, 예정된 전위가 지전위인 것을 특징으로 하는, 고전압용 전기설비.
- 제5항 내지 제9항의 어느 한 항에 있어서, 상기 반도체층의 적어도 2개가 실질적으로 동일한 열팽창계수를 가지는 것을 특징으로 하는, 고전압용 전기설비.
- 제5항 내지 제7항의 어느 한 항에 있어서, 전류운반도선은, 그중 오직 소수만이 서로 절연되지 않은 복수의 소선으로 구성되는 것을 특징으로 하는, 고전압용 전기설비.
- 제1항 내지 제11항의 어느 한 항에 있어서, 권선부가, 각 도선이 다수의 소선들로 된 하나 또는 그 이상의 전류운반도선(2)들로 구성된 하나의 케이블과 각 도선 주위에 배치된 하나의 내측 반도체층(3)과, 각 내측 반도체층(3) 주위에 배치된 고체 절연재로 된 하나의 절연층(4)과, 그리고 각 절연층(4)의 주위에 배치된 하나의 외측 반도체층(5), 을 포함하여 구성된 것을 특징으로 하는, 고전압용 전기설비.
- 제12항에 있어서, 상기 케이블은 하나의 금속 스크린과 하나의 피복을 더 포함하여 구성되는 것을 특징으로 하는, 고전압용 전기설비.
- 제1항 내지 제11항의 어느 한 항에 있어서, 모터의 고정자가 액체 및/또는 가스의 흐름에 의해 지전위에 쿨링되는(cooled) 것을 특징으로 하는, 고전압용 전기설비.
- 제1항 내지 제14항의 어느 한 항에 있어서, 고전압용 케이블(6)은 10-250㎜정도의 외경과 40-3,000㎟정도의 도선영역을 가지는 것을 특징으로 하는, 고전압용 전기설비.
- 제1항 내지 제15항의 어느 한 항에 있어서, 회전 전기모터(들)용 시동전류 및/또는 장애(fault)전류는, 회전 전기기계(도4)의 전기자 권선에 일시적으로 그리고/또는 영구히 연결된, 리액터/인덕터와 같은, 하나의 전기스태틱(static)기계에 의해서 제한되도록 배치된 것을 특징으로 하는, 고전압용 전기설비.
- 제1항 내지 제16항의 어느 한 항에 있어서, 적어도 하나의 모터의 중성점(the neutral point)이 하나의 임피던스를 통해서 접지되는 것을 특징으로 하는, 고전압용 전기설비.
- 제1항 내지 제17항의 어느 한 항에 있어서, 적어도 하나의 모터의 중성점이 직접 땅(earth)에 연결되는 것을 특징으로 하는, 고전압용 전기설비.
- 제1항 내지 제18항의 어느 한 항에 있어서, 모터가 일시적인 큰 과부하용량을 가지는 무효전력을 만들어내도록 구성된 것을 특징으로 하는, 고전압용 전기설비.
- 제1항 내지 제19항의 어느 한 항에 있어서, 모터가 전압레벨의 어떠한 강하없이 커플링요소를 경유하여 배전네트워크 또는 송전네트워크에 연결되도록 구성된 것을 특징으로 하는, 고전압용 전기설비.
- 제1항 내지 제20항의 어느 한 항에 있어서, 모터가 36㎸를 초과하는 공급전압을 가진 배전네트워크 또는 송전네트워크에 연결되도록 구성된 것을 특징으로 하는, 고전압용 전기설비.
- 제1항 내지 제21항의 어느 한 항에 있어서, 모터의 권선부는 자체조정 전계제어를 하도록 구성되고, 전계제어를 위한 보조수단이 없는 것을 특징으로 하는, 고전압용 전기설비.
- 각 모터가 적어도 하나의 권선부를 포함하는 하나 또는 그 이상의 모터로 구성된 것으로서 ; 모터의 적어도 하나의 권선부가, 열적 및 전기적 성질에 있어서 36㎸를 넘는 전압레벨을 허용하는 하나의 절연 시스템을 포함하여 구성된 것을 특징으로 하는, 고전압용 전기설비.
- 제23항에 있어서, 상기 모터가 청구항 제1항 내지 21항의 어느한 항에 청구된 설비를 정의하는 특성을 포함하는 것을 특징으로 하는, 고전압용 전기설비.
- 적어도 하나의 권선부를 가지는 것으로서 ; 권선부가 각각본질적으로 하나의 등전위표면을 적어도 두 개의 반도체층과 중간 고체 절연부를 포함하여 구성되는 것을 특징으로 하는, 전기모터.
- 제25항에 있어서, 고정자 권선부가 부분권선 시동(partial winding start)을 할 수 있도록 2개의 부분으로 나누어진 것을 특징으로 하는, 전기모터.
- 제25항 또는 제26항에 있어서, 하나 또는 그 이상의 접속전압을 갖는 것을 특징으로 하는, 전기모터.
- 제25항 내지 제27항의 어느 한 항에 있어서, 제2항 내지 제24항의 어느 한 항에서 정의된 설비내의 모터의 특성을 포함하는 것을 특징으로 하는, 전기모터.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
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SE9602079-7 | 1996-05-29 | ||
SE9602079A SE9602079D0 (sv) | 1996-05-29 | 1996-05-29 | Roterande elektriska maskiner med magnetkrets för hög spänning och ett förfarande för tillverkning av densamma |
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KR20000016096A true KR20000016096A (ko) | 2000-03-25 |
Family
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Application Number | Title | Priority Date | Filing Date |
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KR1019980709662A KR20000016095A (ko) | 1996-05-29 | 1997-05-27 | 차량의 전기구동시스템 |
KR1019980709663A KR20000016096A (ko) | 1996-05-29 | 1997-05-27 | 전기모터를 구비한 고압설비_ |
KR1019980709661A KR20000016094A (ko) | 1996-05-29 | 1997-05-27 | 동기보상기 설비 |
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Application Number | Title | Priority Date | Filing Date |
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KR1019980709662A KR20000016095A (ko) | 1996-05-29 | 1997-05-27 | 차량의 전기구동시스템 |
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Application Number | Title | Priority Date | Filing Date |
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KR1019980709661A KR20000016094A (ko) | 1996-05-29 | 1997-05-27 | 동기보상기 설비 |
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EP (7) | EP0901711B1 (ko) |
JP (5) | JP2000511388A (ko) |
KR (3) | KR20000016095A (ko) |
CN (9) | CN1097335C (ko) |
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AR (7) | AR007333A1 (ko) |
AT (6) | ATE259997T1 (ko) |
AU (8) | AU3052597A (ko) |
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1997
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1998
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2003
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