The Single-phase Current Relay Protection Tester Development

Microprocessor-based relay test equipment has become essential to the field of special protective relay test equipment. But for the 35kV line protection devices, as long as the single-phase current microcomputer relay protection tester will be able to meet the testing needs. To provide the single-phase current microcomputer relay protection tester that is light weight and automatically test, I made the task of developing the project. Developed it based on the AVR microcontroller featuring a strong, easy to use, cheap instrument.In the development of a single-phase current relay protection tester in the process have been put forward as a whole the general requirements; use more powerful but cheap avr microcontroller core, use an ordinary user-friendly operation of the LCD screen and keyboard; order to improve the voltage and current output accuracy, power supply filtering and analog design small-signal filtering; in the software, the planning of the program structure and function modules; to achieve a specific test procedures and general test procedures, test procedures can be automated testing and manual testing, users can easily use.After testing that have been developed by a single protection device to provide both high precision voltage source and current source, the value of the test can also provide action, the entire group transmission, AC and DC test, low-cycle load shedding and low voltage load shedding, power direction, harmonic restraint testing, while providing automatic test mode.Protection devices for 35kV line, have been developed by a single protection device and easy to carry, and easy operation, the use of personnel to meet the relay.