Resistance Cabinet Working Principle: The ground transformer is referred to as the ground change. According to the filler medium, the grounding can be divided into oil-type and dry; according to the phase, the ground variable can be discharged to the three-phase grounding and single phase.
Grounding is artificial manufacturing a neutral point for connecting ground resistance.When the system is ground fault, the positive sequencer current is high impedance, and the zero-sequence current is low-impedably enabled to protect the ground protection.The resistive current is injected to the fault point, so that the ground fault current is contracted, reducing the phase difference from the voltage, reducing the heavy ignancy after the fault point current is abutting, so that the overvoltage is limited to 2.6 times the phase voltage.Improve the sensitivity of relay protection to trip, thereby effectively protecting the system normally operation.The resistor is suitable for the system neutral point to use small resistors or intermediate resistance.
The grid is required to trip the fault line immediately when a single phase failure is faulty.When the power grid appears single-phase ground, the grounding point provides additional resistive current, so that the ground current is placed, thereby ensuring that the generated overvoltage does not exceed 2.6 times the phase voltage.