Your Content Goes Here
Recently I sorted out the connections and differences between products, and wanted to focus on the analysis of the difference between the three-phase relay protection tester and the phase sequence table, how the two are connected together to distinguish, the phase sequence table is to detect the three phases of A, B, and C. Whether the corresponding electrician instrument.
Importance of phase sequence table
The difference between the three-phase relay protection tester and the phase sequence table, because the secondary circuit wiring is more complicated, it is easy to cause the A, B, C three-phase wiring to be inconsistent with the actual relationship, resulting in confusion in measurement and control, so it must be carried out with a phase sequence table. Detect the phase sequence of AC three-phase power, which is used in occasions with strict requirements and to ensure the correct phase sequence. The phase sequence meter can detect the five fault phenomena of lack of phase, reverse phase, three-phase voltage unbalance, overvoltage, and undervoltage in industrial electricity, and disconnect the electrical equipment in time to play a protective role.
Principle of phase sequence table
When the phase sequence is right, the relay will pull in; if the phase sequence is wrong, the phase sequence meter will not pull in. The three-phase power supply includes A-phase, B-phase, and C-phase. If the motor is connected to the motor according to the ABC phase sequence power supply, and the motor is forward rotating, then the ACB phase sequence power supply is connected to the motor, and the motor is reversed. In order to prevent the motor from reversing, the phase sequence table is added to prevent the incoming power from being reversed and causing the motor to reverse.
The main function of the three-phase relay protection tester is to automatically cut off the power when electrical equipment and lines fail, to avoid the expansion of the accident, and to ensure the safety of the power grid and personal safety. The difference between the three-phase relay protection tester and the phase sequence table. However, the function of the three-phase relay protection tester must be selective, fast, sensitive and reliable.
