English 
A relay protection tester is a device used to test and verify the performance of relay protection devices in power systems. In addition to offline testing functions, relay protection testers also feature online monitoring and testing capabilities. Online monitoring and testing allow for real-time monitoring and testing of relay protection devices during their actual operation, ensuring their reliability and accuracy in real-world scenarios. Below is an introduction to the online monitoring and testing function.
Online monitoring and testing allow for testing and monitoring relay protection devices while they are connected to the actual power system and in operation. This function typically includes the following aspects:
Real-time Data Acquisition:
1. The tester can acquire real-time parameters such as voltage, current, frequency, and phase angle from the power system.
2. Through real-time data acquisition, the operational status of the power system and the working condition of the relay protection devices can be monitored.
Fault Recording and Analysis:
1. The tester can record fault events occurring in the power system, including fault type, fault time, and fault duration.
2. By analyzing fault events, the response and operation of the relay protection devices during faults can be evaluated.
Dynamic Performance Testing:
1. The tester can perform dynamic performance tests during the normal operation of the power system, such as load changes and frequency fluctuations.
2. Through dynamic performance testing, the stability and reliability of the relay protection devices under different operating conditions can be verified.
Remote Monitoring and Diagnosis:
1. The tester can achieve remote monitoring and diagnosis through network connectivity.
2. Remote monitoring allows real-time viewing of the operational status of the power system and relay protection devices, while remote diagnosis can quickly locate and resolve issues.
Automated Testing:
1. The tester can preset automated testing programs to automatically execute testing tasks during the operation of the power system.
2. Automated testing can improve testing efficiency and reduce human intervention and errors.
Alarms and Notifications:
1. The tester can set alarm thresholds and automatically issue alarm signals when abnormal conditions are detected.
2. Alarm signals can notify relevant personnel through sound, light, SMS, email, etc., to take timely action.
Data Storage and Report Generation:
1. The tester can store data collected during online monitoring and testing.
2. Detailed monitoring and testing reports can be generated for subsequent analysis and decision-making.
Real-time: Online monitoring and testing can obtain real-time operational data of the power system and relay protection devices, allowing for timely detection and resolution of issues.
Continuity: Online monitoring and testing can be conducted during the normal operation of the power system without requiring shutdowns, ensuring continuous operation of the power system.
Comprehensiveness: It can comprehensively monitor and test various operational states and fault conditions of the power system, providing a thorough performance evaluation.
In summary, the online monitoring and testing function is an important part of the relay protection tester. Through online monitoring and testing, the operational status of the power system and relay protection devices can be monitored in real-time, ensuring their reliability and accuracy in actual operation.
