Primary current injection testing sets are essential for testing the protection and operational characteristics of high-voltage circuit breakers,relays,and other protective devices in power systems.Here are some reasons why they are necessary:

　　1.Verification of Protection Settings:Primary current injection tests are used to verify that the protection settings of protective devices such as circuit breakers and relays are correctly configured.This ensures that the devices will operate as intended during actual fault conditions.

　　2.Testing Reliability:These tests help in ensuring the reliability of protective devices by subjecting them to high currents that simulate fault conditions.By doing so,any weaknesses or malfunctions in the devices can be identified and rectified.

　　3.Compliance with Standards:Many industry standards and regulations require periodic testing of protective devices in power systems.Primary current injection testing sets help in complying with these standards and ensuring the safety and reliability of the electrical system.

　　4.Fault Detection:Primary current injection tests can help in detecting faults in the system and isolating the faulty components.This proactive approach can prevent potential damage to equipment and ensure the continuity of power supply.

　　5.Commissioning and Maintenance:These tests are crucial during the commissioning of new equipment and for routine maintenance of existing systems.They help in verifying the correct operation of protective devices and ensuring the overall health of the electrical system.

　　In summary,primary current injection testing sets are indispensable tools for ensuring the proper functioning,reliability,and safety of protective devices in high-voltage power systems.