MRD-196H24-channel microcomputer small current grounding line selection device

Product usage and characteristics R small current system grounding microcomputer line selection device (as shown in Figure 1) uses C microcontroller for analysis and judgment. This device is suitable for power systems in which the neutral point is not grounded or is grounded through an arc suppression coil and the neutral point is grounded through a resistor. Whether it is metallic grounding, gap grounding, arc grounding, or ferromagnetic resonance grounding, the grounding line can be accurately selected without being limited by the outlet form (overhead wires and cables). Its principle makes use of the relationship between the relative amplitude r and the relative phase r of the zero-sequence current when a single-phase grounding occurs in a small current system, instead of using the concept of the absolute setting value r of previous devices, thereby overcoming the problem of changing system operation modes and small grounding currents. resulting in misjudgments. When a single-phase grounding occurs in the system, the faulty line number can be quickly and accurately determined.
The device has the following characteristics:
No adjustment is required, simple debugging, and little maintenance
Wide application range, no limit on long and short wires, no limit on the number of parallel operation outlets
Can be distinguished Line grounding and bus grounding
The analysis speed is fast. When a ground fault occurs on the line under test, the analysis results can be obtained within seconds
Group ground fault information can be automatically stored
When a single ground fault occurs on the line under test When a phase-to-ground fault occurs, the device outputs an alarm signal and the trip output contact is closed
When a single-phase to ground fault occurs on the line under test, the device (in the form of a switch or serial port) automatically sends a remote signal to communicate with various Comprehensive automation equipment matching.