The Research Of Current Linear Amplifier For Microprocessor Relay Protection Testing System

As China's power industry is developing rapidly, power system protection devices also experienced a type of Electrical and Mechanical Services, Electronic and Computer-based generations of change, makes protection devices to achieve technical progress, constantly improve the performance, function continuously improved. Computer has now entered a development period of protection. So with the corresponding test with updated technology, higher requirements. Computer relay test instrument is the last ten years developed a new type of intelligent devices, before the relay test tool is mainly used regulator and the phase-shifter combination of heavy volume, accuracy is not high, can not meet Modern computer check of the relay. With the continuous development of science and technology, computer protection has been widely applied in line protection, the main variation Protection, excitation control and other fields, Substation Automation has become mainstream. Therefore, the computer relay tester, is bound to become a modern protection of staff essential test tools.This research is the following computer-testing technologies in the current amplification technology, is the "linear amplifier and switching power supply," the combination. The main principle is to enter the signal low pass filter, the control circuit under the control by the amplifier circuit in complementary push-pull amplifier will enlarge current output. In this paper, some from power, and control of the power amplifier components. Some of them switching power supply is used in Japan Kosovo's DBS400B the power modules, 400 W power output from the two modules tandem with the use of output +12 V and -12 V, part of the supply amplifier circuit, while the other part of the supply circuits used in the Chips, such as operational amplifiers, the multiplier and the linear amplifier used in the A and B class complementary push-pull amplifier circuit, A and B category B to enlarge an effective solution to the pay the amplifier distortion, high-efficiency amplifier than Group A, Access to an extremely wide range of applications.The system issued by the current relay signals to detect the reliability of the system, to promote the development of protection is of important significance.