The internal part of the relay protection tester is electronic circuit, easy to be interfered by strong electric field and strong magnetic field, the shell earth shield is helpful to improve the working environment of the relay protection tester, the microcomputer protection should 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 the interference source, blocking the coupling channel, improving the anti-interference ability of the sensitive circuit, adopting automatic detection technology and fault-tolerant design. To ensure that the relay protection tester device stops running. The technical design is a kind of exchange for the safety that cannot be changed in the traditional design, which guarantees the reliable operation of the microcomputer relay protection tester.

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

(1) it is especially necessary for duty personnel to check and check the relay protection tester regularly and make good records.

(2) complete the finishing work of the micro relay protection tester. The finishing work must be done by two people to prevent accidental touching of the operating equipment, keep a safe distance from the live equipment, and avoid personal electric shock, secondary circuit short circuit and grounding accident.

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

(4) regularly conduct infrared temperature measurement of terminal row of relay protection tester. Can detect bad contact fever as soon as possible.

(5) check and print the relay protection tester printer regularly. Prevent data loss.

(6) professionals check the relay protection tester every month to see if there is any fault, and check the accuracy error through a variety of ways. And whether the failure is timely analyzed after the failure occurs.

Anti-electromagnetic interference measures of relay protection tester:

In the substation test, when the microcomputer protection is used to replace the 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, the installation cable has a shield layer, both ends of the shield layer must be grounded, the purpose of this is to prevent the circuit is too long. When one end is grounded, the other end will generate voltage and current due to electromagnetic interference, resulting in the 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, reasonably manufacture and use high-quality components. At the same time, shielding and isolation technology should be used to ensure the reliability of the relay protection tester, so as to improve the anti-interference ability of the relay protection tester.