[특허]Method and apparatus for metering and monitoring AC generators

Automatic Terminal Information Systems, Inc. (Houston TX 02)

검색어에 아래의 연산자를 사용하시면 더 정확한 검색결과를 얻을 수 있습니다.
검색연산자

검색도움말
검색연산자	기능	검색시 예
()	우선순위가 가장 높은 연산자	예1) (나노 (기계 \| machine))
공백	두 개의 검색어(식)을 모두 포함하고 있는 문서 검색	예1) (나노 기계) 예2) 나노 장영실
\|	두 개의 검색어(식) 중 하나 이상 포함하고 있는 문서 검색	예1) (줄기세포 \| 면역) 예2) 줄기세포 \| 장영실
!	NOT 이후에 있는 검색어가 포함된 문서는 제외	예1) (황금 !백금) 예2) !image
*	검색어의 *란에 0개 이상의 임의의 문자가 포함된 문서 검색	예) semi*
""	따옴표 내의 구문과 완전히 일치하는 문서만 검색	예) "Transform and Quantization"

과학기술 지식인프라 ScienceON

연합인증

연합인증 가입 기관의 연구자들은 소속기관의 인증정보(ID와 암호)를 이용해 다른 대학, 연구기관, 서비스 공급자의 다양한 온라인 자원과 연구 데이터를 이용할 수 있습니다.

이는 여행자가 자국에서 발행 받은 여권으로 세계 각국을 자유롭게 여행할 수 있는 것과 같습니다.

연합인증으로 이용이 가능한 서비스는 NTIS, DataON, Edison, Kafe, Webinar 등이 있습니다.

한번의 인증절차만으로 연합인증 가입 서비스에 추가 로그인 없이 이용이 가능합니다.

다만, 연합인증을 위해서는 최초 1회만 인증 절차가 필요합니다. (회원이 아닐 경우 회원 가입이 필요합니다.)

연합인증 절차는 다음과 같습니다.

최초이용시에는
ScienceON에 로그인 → 연합인증 서비스 접속 → 로그인 (본인 확인 또는 회원가입) → 서비스 이용

그 이후에는
ScienceON 로그인 → 연합인증 서비스 접속 → 서비스 이용

연합인증을 활용하시면 KISTI가 제공하는 다양한 서비스를 편리하게 이용하실 수 있습니다.

특허 상세정보

MyON담기

내보내기 페이스북 공유 트위터 공유 카카오톡 공유

Method and apparatus for metering and monitoring AC generators

특허상세정보
국가/구분	United States(US) Patent 등록
국제특허분류(IPC7판)	G01R-019/00 G01R-021/00 G01R-021/06
미국특허분류(USC)	364/483 ; 364/492 ; 364/494
출원번호	US-0130437 (1993-10-01)
발명자 / 주소	Allen Charles R. (Houston TX) Spaw Robert L. (Houston TX)
출원인 / 주소	Automatic Terminal Information Systems, Inc. (Houston TX 02)
인용정보	피인용 횟수 : 18 인용 특허 : 0

초록
▼

This invention involves transducing and monitoring the power being delivered by an electric generator to a power bus by using a monitor which includes an embedded microprocessor in the memory of which are stored reference digital numbers that correspond to the generator\s nominal power, and to the components of the nominal power including output power. The generator\s voltage and current signals are sensed and then shaped for use by the microprocessor wherein they are digitized into a first set of digital numbers. Preferably, the first set of digital numbers is converted into pulse-width modulated (PWM) square-wave signals, which are demodulated into DC current signals that are indicative of the power and the components of power being delivered by the electric generator to its power bus. The microprocessor digitizes the square wave signals into a second set of digital numbers, and calculates from the first and from the second sets of digital numbers real time digital numbers. Preferably a microcontroller is also embedded with the microprocessor to compare the calculated real time digital numbers with their corresponding reference digital numbers and to generate control signals to selectively actuate circuit breakers which interconnect the generator and its loads to the power bus.

대표
청구항
▼

In a power measuring and control system (20) for measuring and controlling the output power of a multiphase AC generator (21) and its prime mover; said generator being connected in parallel with another multiphase AC generator (21′) through a power bus (24) having at least three phase lines fa,fb,fc for feeding power to loads (23a-23c) through connect/disconnect means (80d-82d); each one of said generators having distinct criteria for the nominal output power, the magnitude and sign of the power factor (PF), the RMS voltage Vrms, the RMS current Irms, and their fundamental frequency f; and said criteria having specified, allowable deviation ranges within set trigger points, the improvement comprising: voltage sensing means (25,25′) for sensing between said phases fa,fb and fb,fc the instantaneous sinusoidal voltage signals Vab,Vbc (30,32), respectively, having a fundamental frequency f; current sensing means (26,26′) for sensing the instantaneous sinusoidal current signals Ia,Ic (33,35) in said phases fa,fc, respectively; signal shaper means (27,28,29,50,51,54,55) for shifting, band-limiting and attenuating said instantaneous voltage and current signals and for producing therefrom: (a) corresponding attenuated sinusoidal voltage and current signals Vab,Vbc (38,39) and Ia,Ic (40, 41), (b) corresponding, respective, synchronized, voltage and current square-wave signals Vab,Vbc,Ia,Ic (42,43,44,45) containing information on said fundamental frequency f, and (c) a square wave signal Vab (46) having a fixed, high-multiple frequency of said fundamental frequency f; said shaper means (27) having two voltage channels (28) and two current channels (29), each channel having phase-locked loops (PLL) (51) for generating from said attenuated sinusoidal signals Vab,Vbc,Ia,Ic said square wave signals Vab,Vbc,Ia,Ic (42-46); micro-processor/micro-controller (M-P/M-C) means (22) including: an electronic read-only memory (ROM) (60), a random-access memory (RAM) (61), analog-to-digital (A/D) converter means, high-speed inputs (HSIs) for receiving said square wave signals Vab,Vbc,Ia,Ic (42-45), an external interrupt (EXINT) input for receiving said high frequency square wave signal Vab (46), high-speed outputs (HSOs), and hi-directional input-output (I/O) ports (P1); a configuration network (62) coupled to said ROM (60) and to said RAM (61) through an address/data bus (63) for configuring said micro-processor/micro-controller means (22) to control the output power of its associated generator in accordance with said generation\s particular criteria values and set points; said network (62) including binary-coded rotary configuration switches, each switch being mechanically adjustable for a particular criterion value and its set points, and each switch acting as a mechanical ROM occupying memory address space in said electronic ROM and being readable as an electronic ROM; said (A/D) converter means digitizing said attenuated sinusoidal voltage and current signals Vab,Vbc,Ia,Ic (38,39,40,41); said M-P means (22) under the control of software digitizing said square wave signals Vab,Vbc,Ia,Ic (42-45) into respective digital representations thereof, sampling, N times per cycle, starting when said high-frequency square wave signal (46) transits from low to high, the instantaneous digital values of vab,vbc and of ia,ic, for each sample of said digitized sinusoidal voltage and current signals, calculating for each sample the instantaneous power pas in said phase fa from pas=(vabia) and the instantaneous power pcs in said phase fc from pcs=(vbcic), calculating the mean power per cycle pam/cyc in said phase fa from pam/cyc=Sas/N, the mean power per cycle pcm/cyc in said phase fc from pcm/cyc=Scs/N, and the resultant mean power per cycle of Pm/cyc from Pm/cyc=pam+pcm, digitally calculating 1) the root-mean-square RMS value of the voltage per cycle between (a) said phases fa, fb from vabmrms/cyc=√Sab2/N, (b) said phases fb,fc from vbcmrms/cyc=√Sbc2/N, 2) the root-mean-square RMS value of the current per cycle in (a) said phase fa from iamrms/cyc=√Sa2/N, (b) said phase fc from icmrms/cyc=√rc2/N, 3) the mean root-mean-square RMS value of the voltage per cycle on said bus from Vmrms/cyc=(Yabrms+vbcrms)/2, 4) the mean root-mean-square RMS value of the current per cycle in said bus from Imrms/cyc=(iarms+icrms)/2, and 5) the power factor value per cycle in said bus from PF/cyc=Pm/(1.73 Vmrms×Imrms), said PF/cyc being positive (+) when said square wave signals Ia,Ic (40,41) lead said square wave signals Vab,Vbc (38,39), respectively, and, conversely, said PF/cyc being negative (-) when said square wave signals Ia,Ic (40,41) lag said square wave signals Vab,Vbc; said (M-P/M-C) means (22) being, in use, under the control of said software and of said settings on said configuration switches for continuously digitally comparing one or more of said measured components of power, including: said instantaneous phase powers pa and pc, said mean power per cycle Pm, said phase RMS voltages per cycle vabmrms and vbcmrms, said mean RMS voltage per cycle vmrms, said RMS phase currents per cycle Iamrms and Icmrms, said mean RMS current per cycle Imrms, and said power factor per cycle PF and its sign (+/-), against their corresponding comparable criteria values stored in said electronic ROM, and when the result of such comparison yields a result which is either under or over one of said stored set point values in said ROM, said M-C means is triggered to output from said I/O bi-directional ports a digital control signal tripping, in a timely fashion, one or more of said connect/disconnect means (80d-82d) thereby causing appropriate successive sheddings of said loads from said bus or, if said load sheddings are insufficient, to completely break the tie between the controlled overloaded generator (21) and said power bus (24) so as to reduce from said overloaded generator a temporary, excessive, high-power load demand, and protecting the remaining generator (21′) and its prime mover; and adjustable delay means for delaying said load sheddings by discrete time intervals before generating said control signals.

이 특허를 인용한 특허 피인용횟수: 18

IPC 상위 출원인

내보내기

상세정보
내보내기 구분	파일저장 인쇄 메일전송
구성항목	관리번호, 국가코드, 자료구분, 상태, 출원번호, 출원일자, 공개번호, 공개일자, 등록번호, 등록일자, 발명명칭(한글), 발명명칭(영문), 출원인(한글), 출원인(영문), 출원인코드, 대표IPC 관리번호, 국가코드, 자료구분, 상태, 출원번호, 출원일자, 공개번호, 공개일자, 공고번호, 공고일자, 등록번호, 등록일자, 발명명칭(한글), 발명명칭(영문), 출원인(한글), 출원인(영문), 출원인코드, 대표출원인, 출원인국적, 출원인주소, 발명자, 발명자E, 발명자코드, 발명자주소, 발명자 우편번호, 발명자국적, 대표IPC, IPC코드, 요약, 미국특허분류, 대리인주소, 대리인코드, 대리인(한글), 대리인(영문), 국제공개일자, 국제공개번호, 국제출원일자, 국제출원번호, 우선권, 우선권주장일, 우선권국가, 우선권출원번호, 원출원일자, 원출원번호, 지정국, Citing Patents, Cited Patents
저장형식	Text(ASCII format) Excel format PIAS분석(.xls)
메일정보	받는사람 (필수) @ 보내는사람 (선택) @ 제목 내용 KISTI 검색결과 이메일 서비스
안내	> 총 건의 자료가 검색되었습니다. > 다운받으실 자료의 인덱스를 입력하세요. (1-10,000) > 검색결과의 순서대로 최대 10,000건 까지 다운로드가 가능합니다. > 데이타가 많을 경우 속도가 느려질 수 있습니다.(최대 2~3분 소요) > 다운로드 파일은 UTF-8 형태로 저장됩니다. 파일의 내용이 제대로 보이지 않을실 때는 웹브라우저 상단의 보기 -> 인코딩 -> 자동선택 여부를 확인하십시오 > ~ > Text(ASCII format) Excel format

과학기술 지식인프라 ScienceON

ScienceON Chatbot

연합인증

특허 상세정보

Method and apparatus for metering and monitoring AC generators

초록
▼

대표
청구항
▼

이 특허를 인용한 특허 피인용횟수: 18

IPC 상위 출원인

과제정보

상세정보조회

원문조회

IPC 상세정보(version : 201201)

연구과제 성과물(0)

참여연구원의 다른 문헌(0)

처리중입니다.

잠시만 기다려주세요.

ScienceON Chatbot

연합인증

특허 상세정보

Method and apparatus for metering and monitoring AC generators

초록 ▼

대표청구항 ▼

이 특허를 인용한 특허 피인용횟수: 18

IPC 상위 출원인

과제정보

상세정보조회

원문조회

IPC 상세정보(version : 201201)

연구과제 성과물(0)

참여연구원의 다른 문헌(0)

처리중입니다.

잠시만 기다려주세요.

초록
▼

대표
청구항
▼