Factors that interfere with microcomputer relay protection tester:
1, electrostatic discharge interference
In the dry environment, the staff of clothing may with high voltage, in the case of wear insulating boots, they can charge to far away places, so its discharge when staff contact electronic equipment, the degree of discharge in accordance with the equipment grounding, environment, serious when burned electronic components, destroy the microcomputer relay protection tester system.
2. Radiation interference
The power system is often surrounded by tools such as walkie-talkie and mobile communication, so it will generate strong radiation electric field and corresponding magnetic field around. The changing magnetic field is coupled to a nearby loop of weak electronics. The loop will induce a high frequency voltage, forming a false signal source, which will cause the microcomputer relay protection tester to act incorrectly.
3, a lightning strike
When transformer substation grounding component or lightning arrester lightning strike, as a result of the substation ground network for high impedance or from the device to the ground as the high impedance grounding line, will be because of a lightning strike to produce high frequency current, caused in the substation ground network system transient potential rise, can lead to guodian west high sensitive computer relay protection tester misoperation or damage to the equipment and control circuit.
4. High-frequency interference
If the isolating switch power system operating speed is slow, when operating in the two isolating switch contact ask can produce arc flashover, resulting in operating overvoltage, a high frequency current, high frequency current by bus, will have a strong electric field and magnetic field around the bus, to relevant secondary loop and the second device to produce interference, When the interference level exceeds the allowable interference level of the logic element of the device, it will cause the abnormal operation of the microcomputer relay protection tester, so that the working logic of the whole device or the outlet logic is abnormal, causing great damage to the stability of the system. High frequency current flowing into the ground network through grounding capacitor equipment will cause the increase of ground potential.
