The relay protection tester is also called a three-phase relay protection tester. The internal part is an electronic circuit, which is easy to be interfered by strong electric and magnetic fields. Improve the reliability of the relay protection tester. In order to ensure the reliability of the microcomputer relay protection tester, the reliability of the microcomputer relay protection tester should be ensured by suppressing interference sources, blocking the coupling channel, improving the anti-interference ability of sensitive circuits, using automatic detection technology and fault-tolerant design. To ensure that the relay protection tester device stops running.

The daily maintenance of the relay protection tester should be strictly implemented, develop good habits, and pay attention to the cleaning, maintenance and power failure after each use:

1. It is especially necessary for the personnel on duty to regularly inspect and inspect the relay protection tester, and keep records;

2. Do the finishing work of the miniature relay protection tester. The finishing work must be carried out by two persons to prevent accidentally touching the operating equipment and keep a safe distance from the live equipment to avoid personal electric shock, secondary circuit short circuit and grounding accidents;

3. Record the current and voltage sampling values of the relay protection tester once a week, and record the differential current value of the differential protection;

4. Periodically perform infrared temperature measurement on the terminal block of the relay protection tester. Poor contact and fever can be detected as soon as possible;

5. Regularly check and print the printer of the relay protection tester. Prevent data loss;

5. Professionals check the relay protection tester every month to see if there is any fault, and check the accuracy error in a variety of ways. And whether the failure analysis is carried out in time after the failure occurs;

Anti-electromagnetic interference measures for relay protection tester:

In the substation test, when microcomputer protection is used instead of electromagnetic protection, the relay protection tester must take technical measures to prevent electromagnetic interference, that is, strictly implement the installation conditions of the relay protection tester, and install the cable with a shielding layer, and the shielding layers at both ends must Ground, the purpose of this is to prevent the circuit from being too long. When one end is grounded, the other end will generate voltage and current due to electromagnetic interference, resulting in rejection or misoperation of the microcomputer relay protection tester. In order to reduce the failure rate and error rate of the relay protection tester, it is necessary to optimize the design of the relay protection tester, and reasonably manufacture and use high-quality components. At the same time, shielding isolation technology should be used to ensure the protection of the relay protection tester. Reliability, thereby improving the anti-interference ability of the relay protection tester.