There are three main testing instruments for microcomputer protection devices: microcomputer relay protection tester, three-phase current generator, and multimeter
1) It is recommended to use a microcomputer relay protection tester that can simultaneously output three-phase voltage and three-phase current and has input timing for testing high-voltage microcomputer protection devices 2) Test the low-voltage microcomputer protection device. If the current sampling value is output to the microcomputer protection device through the current transformer, a microcomputer relay protection tester can be selected; If the current sampling value is directly output to the microcomputer protection device through a dedicated transformer, only a three-phase current generator can be used to apply the test current on the primary side
2. Test precautions
1) The testing instruments and cabinets should be reliably grounded to ensure that the microcomputer protection device and testing instruments are grounded together.
During the power-on or testing process of the microcomputer protection device, it is strictly prohibited to plug or unplug the device's plug-in, and it is strictly prohibited to touch the plug-in circuit. When it is necessary to plug and unplug, the power supply must be turned off first, and the external test power supply must be disconnected. Release static electricity on your hands or wear a static protective belt before proceeding with the operation During the test process, it is strictly prohibited to apply high voltage incorrectly to the low voltage or communication terminals when replacing the test line The selection of test points must be accurate. The voltage and current lines of the tester should not be directly added to the terminals of the microcomputer protection device, but should be added to the root of the transformer in order to find the degree of signal attenuation during the collection process and ensure the integrity of the test3. Preparation before the test
1) Before the test, carefully read the manual or debugging outline of the microcomputer protection device, and verify whether the manual, nameplate of the microcomputer protection device, actual drawings, and the voltage and current transformation ratio of the system are consistent.
2) Read the manual of the microcomputer protection tester in detail, and be sure to proficiently master the operating program before the test. Avoid erroneous operations that impose unbearable voltage and current on the microcomputer protection device, causing equipment damage Tighten the screws or quick connectors of the microcomputer protection device to ensure a secure connection4) Enter the protection menu and set the protection settings. When inputting the fixed value, it is necessary to understand the connotation of the fixed value sheet, and at the same time, organize and label the fixed value sheet for use in reviewing the fixed value
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