Abstract:
PURPOSE: A copper bus bar transfer device of a high current transformer is provided to easily transfer and position a heavy copper bus bar at a desirable position. CONSTITUTION: A copper bus bar transfer device of a high current transformer includes a transferor and a main frame. The transferor is comprised of a loading unit and a transfer unit. The main frame is comprised of two bottom frames(11), a plurality of vertical frames(12), an upper frame(13), a support frame(14), a fixing unit(14b), and a fixing block. The main frame supports the weight of a transfer product(100) when the transfer product is separated from the transferor and helps the movement of the transfer product to a target position.
Abstract:
본 발명은 측정하고자 하는 션트저항에서 발생되는 위상각 오차를 정확하게 측정하기 위한 펄스 계수를 이용한 션트저항의 위상각 오차 측정장치 및 이를 이용한 오차 측정방법을 제공하는데 있다. 이를 달성하기 위한 수단으로, 전류채널 및 전압채널이 구비되는 전력공급부; 전력공급부에 직렬로 연결되어 전류를 공급받는 표준션트저항; 전력공급부와 표준션트저항에 각각 직렬로 연결되어 전류를 공급받아 위상각 오차를 측정하기 위한 측정션트저항; 표준션트저항과 측정션트저항을 선택적으로 선택하는 제 1스위치; 선택된 션트저항에서 출력되는 전압 신호를 사각파로 변환시키는 제 1제로 크로싱 앰프; 전력공급부에 연결되어 공급되는 기준 위상신호를 사각파로 변환시키는 제 2제로 크로싱 앰프; 제 1, 2제로 크로싱 앰프로부터 각각 출력된 션트 사각파와 기준 사각파가 입력될 수 있도록 하는 제 2스위치; 각각 션트 사각파와 기준 사각파를 제공받아 위상각 오차를 계산하는 위상감지부; 고주파를 제공하는 고주파 발생부; 고주파에 위상감지부에서 출력된 위상각 오차를 비교하여 위상각 오차에 비례하는 고주파를 추출하는 위상 비교부; 및 위상차 오차 고주파의 펄스 수를 계수하는 펄스 계수부;를 포함하여 형성된 것이 특징이다. 션트저항, 위상각 오차, 표준션트저항, 펄스 계수
Abstract:
PURPOSE: An absolute evaluation system of a capacitor and an inductor and an absolute evaluation method thereof are provided, which can measure capacitance and inductance of a specimen by measuring phase error according to resistor value change of a voltage transformer comparator. CONSTITUTION: An AC power source(10) sanctions the AC voltage. A first element and a second element are successively and serially connected to the AC power source. One of the first element and the second element is resistor(20). The other element is a capacitor(30) or an inductor. A first element is electrically connected between N terminal(120) and X terminal(110).
Abstract:
PURPOSE: An input impedance evaluation apparatus of an AC-DC converter and an evaluation method thereof are provided to precisely measure low voltage AC by additionally comprising a load resistance between a low voltage measuring standard device and a low voltage AC-DC converter. CONSTITUTION: A low voltage measuring standard device(30) changes AC voltage to DC voltage. A converter(50), to be measured, is connected to the output side of the low voltage measuring standard device. Voltage meters(10,20) measure the output DC voltage of the low voltage measuring standard device and the converter. The load resistance is produced between the low voltage measuring standard device and the converter.
Abstract:
본 발명은 직류-저주파 교정기의 원격 교정 시스템에 관한 것이다. 이를 위해, 클라이언트 컴퓨터(50)가 네트워크(10)를 통해 웹서버(22)에 접속하여 설치 프로그램을 다운로드하여 교정 프로그램을 설치하는 단계(S100); 상기 교정 프로그램을 실행하는 단계(S110); 상기 클라이언트 컴퓨터(50)가 GPIB를 스캔하여 연결상태 및 연결주소를 판독하는 단계(S120); 상기 클라이언트 컴퓨터(50)가 DB 서버(30)에 GPIB 명령어를 요청하는 단계(S130); 수신된 GPIB 명령어를 MTS(60)로 전송하고, 교정기(70)를 대상으로 한 상기 MTS(60)의 응답을 상기 DB 서버(30)로 회신하는 단계(S140); 및 상기 DB 서버(30)가 회신된 응답을 테이블(32)에 저장하고, 응답의 편차로부터 불확도를 평가하는 단계(S150);로 구성되고, 상기 클라이언트 컴퓨터(50)에는 상기 MTS(60) 및 상기 교정기(70)와 통신하기 위하여 IEEE 488.2 통신 프로토콜 수단(56)을 더 포함하고 있는 것을 특징으로 한다. 직류, 저주파, 원격, 교정, 네트워크, 인터넷, GPIB, 통신, 불확도
Abstract:
An apparatus for correcting a high voltage generating device by using a plate electrode and a method for using the same are provided easily to measure a high voltage with a sensor detecting an electric field. An apparatus for correcting a high voltage generating device by using a plate electrode includes an upper metal plate electrode(40) formed with predetermined area and thickness. A lower metal plate electrode(30) is installed for the lower metal plate electrode to be in parallel to the metal plate electrode. The upper metal plate electrode and the lower metal plate electrode are fixed by a movable supporting plate. An electric field measuring sensor(10) is installed at an upper end of the lower metal plate electrode. An outer power source(20) is connected to the upper metal plate electrode and the lower metal plate electrode. The outer power source applies power source to the upper metal plate electrode and the lower metal plate electrode. A digital oscilloscope(60) is connected to the electric field sensor to measure an output voltage between the upper metal plate electrode and the lower metal plate electrode.
Abstract:
A ratio error evaluation device of a current transformer ratio error comparator is provided to move the ratio error evaluation device to an industrial site easily and perform evaluate the comparator at the site by reducing a weight of the ratio error evaluation device. A reference current transformer(10) is connected to a primary side of a current transformer(20) to be measured. Same currents are applied on the reference current transformer and the current transformer to be measured. A ratio error compensator(50) compares a secondary current of the reference current transformer with a secondary current of the current transformer to be measured. A current transformer with a wide ratio error is connected to the current transformer to be measured. A nominal ratio error is accurately matched with a calculated ratio error. A winding number of the secondary side of the current transformer is maintained at a constant value. The winding number of the current transformer is varied by a ratio error adjusting unit.
Abstract:
A current transformer having a ratio error of a wide range and a correction method of a ratio error measuring device using the same are provided to estimate the linearity of the ratio error measuring device in industries by using the movable current transformer having the ratio error of the wide range. A current transformer having a ratio error of a wide range includes a reference current transformer(40), and a current transformer(50). The current transformer is installed on a ratio error measuring device to measure and compare a second current with the reference current transformer. The current transformer, which is used as an object to be measured, receives a current having the same amplitude with the reference current transformer in a first side. The first side of the current transformer has one winding number. The second side of the current transformer has selectively and variably one of the winding numbers of 1000, 941, 889, 842, 816, 808, 804, 802, 801, 800, 799, 798, 796, 792, 784, 776, 762, 727, 695, 727, 695, and 667. A current of the first side of the current transformer is 4000A. A current of the second side of the current transformer is 5A. A regular transforming ratio of the first side and the second side is 800.
Abstract:
A system for remotely calibrating a DC-low frequency calibrator is provided to enable a central part to calibrate the remote DC-low frequency calibrator without an expert or an experienced person through the network by downloading and installing a calibration program to a client computer, and keep a national standard and retroactive property by determining an inaccurate level from a calibration result. An installer installs the calibration program by downloading an installation program from a web server(22) through the network(10). A reader reads a connection state and address by scanning a GPIB(General Purpose Interface Bus) in the client computer(50). A database server(30) includes/transmits GPIB commands according to a request of the client computer. An MTS(Multifunction Transfer Standard)(60) calibrates the calibrator(70) based on the received GPIB commands and outputs the calibration result as a response signal. An evaluator evaluates the inaccurate level of the calibrator based on the response signal. The client computer includes a display part sequentially displaying the GPIB commands and the corresponding response signal of the MTS.
Abstract:
본 발명은 전압변성기(voltage transformer, VT)에 관한 것으로, 보다 상세하게는 전압변성기 비교 측정장치에서 측정된 비오차의 선형성을 평가할 수 있는 시스템에 관한 것이다. 이를 위해, 기준 전압변성기(40)와 피측정 전압변성기(50)의 1차측에 동일한 전압을 병렬로 공급하고, 상기 두 전압변성기(40, 50)의 2차측 전압을 전압 변성기 비교 측정장치(60)를 이용하여 비교하는 측정장치에 있어서, 넓은 범위의 비오차를 갖는 전압변성기를 사용하여, 고정된 권선수를 갖는 2차측; 및 1차측의 권선수를 가변할 수 있는 가변수단이 제공된다. 넓은 범위의 비오차를 갖는 전압변성기는 -3% ~ +3%범위에서 권선비에 의한 이론적인 비오차의 계산값과 측정값이 정확히 일치하도록 제작한 것으로서, 이를 이용하여 전압변성기 비교측정장치에서 측정된 비오차값의 선형성을 평가할 수 있다. 전압변성기, 비교측정장치, 비오차, 선형성, 1차측, 2차측, 권선수