The AC and DC power and current sources in the relay protection device use a new electronic power supply, which enables the instrument and equipment to achieve a leading level in circuit principle, component model selection, control panel layout, and internal structure formulation. This relay protection device calibrator has the advantages of complete functions, high quality material selection, clear test report data information, and simple actual operation. It is the first choice equipment for power engineering relay protection units. Types of relay protection devices: current relays, current relays, reclosing motors, auxiliary contacts, transverse differential motors, etc. Use the digital interface display, the reading is intuitive. The structure is compact, the volume is light and handy, it is easy to carry and pack. When testing the relay protection device on site, I didn’t know how to actually operate it. During the actual operation, I found that internal failures did not know how to solve, and did not understand how to connect and the actual operation sequence. These problems are all relay protection work should be. knew! Let’s take a look at the steps to start the relay protection device: 1. First, insert the tester’s electrical plug into the AC 220V electrical plug, turn on the power of the host, and the server motherboard will start the Wi ndo ws operating system. After the start, the host system automatically Enter the main interface of the tester software. 2. The second step is to turn on the power switch of the power amplifier, connect the voltage, current, and voltage circuits. The key is also to connect the digital input, and select the corresponding software power module to test.