The microcomputer relay protection tester is a new type of intelligent testing instrument. The previous relay protection test tools were mainly composed of voltage regulators and phase shifters, which were bulky and had low precision, and could no longer meet the calibration work of modern microcomputer relay protection. With the continuous development of science and technology, microcomputer relay protection has been widely used in line protection, main transformer differential protection, excitation control and other fields, and substation comprehensive automation has become the mainstream. Modern microcomputer relay protection testers can be divided into two forms: one uses traditional OCL power amplifier, which is large in size, weighs about 25Kg, and is relatively bulky. The power amplifier tube works in the amplification area, which is easy to damage over time, and has a narrow dynamic range and low precision. The other uses switching power supply and digital power amplifier, which is small in size, light in weight, and high in efficiency, and is the development direction of relay protection testers. It can test various types of relays such as voltage, current, frequency, power, impedance, harmonic, differential, synchronization, etc., manually or automatically. It can simulate various fault types for distance and zero-sequence protection device calibration and complete group tests of protection devices. It can automatically scan the ratio braking curves of microcomputer and digital transformer and generator-transformer differential protection, and has GPS trigger function. The microcomputer-based relay protection testing device is an important testing tool to ensure the safe and reliable operation of the power system. With the rapid development of computer technology, microelectronics technology, and power electronics technology, applying the latest technological achievements to continuously introduce new high-performance microcomputer relay protection testing devices is an inevitable trend of technological progress. The relay protection testing device is an important testing tool to ensure the safe and reliable operation of the power system. With the continuous expansion of the modern power system scale and the increasing requirements for reliability and efficiency of power system operation and management, the testing work of relay protection personnel has become more frequent and complex. Today, with the rapid development of computer technology, microelectronics technology, and power electronics technology, applying the latest technological achievements to continuously introduce new high-performance relay protection testers is an inevitable trend of technological progress and also the responsibility given to us by the times. The relay protection tester is a new type of miniaturized microcomputer relay protection tester that fully utilizes modern advanced microelectronics technology and devices, based on the People's Republic of China electric power industry standard "Technical Conditions for Microcomputer-based Relay Protection Test Devices" (DL/T 624 ─ 1997). It adopts an advanced structure that can operate independently as a single unit or connect to other computers. The host is equipped with a built-in high-performance industrial computer and high-speed digital signal processor, true 16-bit DAC module, new modular high-fidelity high-power amplifier, and comes with a TFT true color LCD display and embedded microcomputer keyboard. It can be operated independently as a single unit or connected to a laptop for operation. It has powerful operation functions, small size, and high precision. It not only has the superior performance and advanced functions of large testers, but also has the compactness, flexibility, simple operation, and high reliability of small testers.
1. Standard 4-phase voltage and 3-phase current output: It has 4-phase voltage and 3-phase current output, which can conveniently perform various combined outputs for various types of protection tests. Each phase voltage can output 120V, and the three-phase current can output 120A in parallel. The 4th phase voltage Ux is a multifunctional voltage item, which can be set to 4 types of 3U0 or synchronization voltage, or output any arbitrary voltage value.
2. Convenient single-unit operation: The single unit is operated through a large-screen LCD display with a convenient and flexible rotary mouse, with all Chinese display. It can complete most on-site test and calibration work, calibrate various relays and microcomputer protection, and simulate various complex transient, permanent, and converting faults for complete group tests. It can be used immediately after power-on, with fast and convenient operation.
3. Dual operation modes, connected to computer: Through the full set of Chinese operation software on the Windows platform, it can perform various large-scale, complex, and more automated calibration work, conveniently test and scan various protection settings, store test data in real time, display vector diagrams, draw fault waveforms, and print reports online.
4. Powerful software functions: It can complete various large-scale and complex calibration work with high automation, such as three-phase differential test, auxiliary power fast switching, backup power automatic switching test, line protection synchronization and reclosing test, etc. It can conveniently test and scan various protection settings, perform fault replay, store test data in real time, display vector diagrams, and print reports online.
5. Rich switch quantity contacts: 7 contact inputs and 2 pairs of empty contact outputs. The input contacts are compatible with empty contacts and 0~250V potential contacts, and can be intelligently and automatically identified. Input and output contacts can be expanded according to user needs.
6. Large-screen LCD display: This machine uses a 320×240 dot matrix large-screen high-resolution graphic LCD display. All operation processes are set on the display screen, and the operation interface and test results are displayed in Chinese, with intuitive and clear display.
7. Self-protection: It adopts a reasonably designed heat dissipation structure, and has reliable and complete multiple protection measures and power soft start, as well as certain fault self-diagnosis and blocking functions.
8. Independent dedicated DC power output: The device is equipped with a dedicated adjustable DC power output of 110V and 220V.
9. High cost performance: It is a cross-professional joint design product, integrating advanced scientific and technological achievements of multiple specialties. It combines the performance of large testers with the price of small testers, and has a very high performance-price ratio.
