The Experiment Study Of Different Grouding Based On Cable Network

This paper first analyzes the character of distribution network and the excellence and shortcoming of insulated neutral & resonant earthed system and small resistance as well as the operation of different grounding under single-phase ground fault, propose use of low-voltage (380V) to the equivalent analog equivalent circuit 10kV distribution network approach. Established a 380V simulation circuit, Do a large number of tests for single-phase ground features, confirmed that some of the theoretical analysis.In this text equivalent of the analog circuit in the power system is a mixture of common network cable of the four-loop and two composed of overhead lines. According to analyzes the 10kV power system in the normal operation of state time, calculated under the equivalent 380V transformers, inductors, capacitors as well as arc-suppression coil components. Measurement of the components selected the universal form and function with a memory oscilloscope. Protection of components consist of the six 3P10A the air switch. The voltage, current, impedance are equivalent under 380V simulation, using the equivalent models in the laboratory under conditions of simulated neutral earthing and neutral when the Petersen-coil grounded bus bar fault and earth fault lines. Fault model to run as possible as close to the actual circumstances at the scene. Take into accounting the weather, the humidity, as well as on the impact for communications interference.Due to fault time is difficult to determined, the paper has done a thousand times random experiments, obtained at different phase angle under the single-phase ground fault situation, and under different grounding fault data aggregation and collected with the oscilloscope waveform than the right, arrive at the neutral point grounding under different failure of the actual operation of neutral grounding for the subsequent choice of methods to provide the actual data requirements. In this paper, in order to better show the actual operation of the power system, the maximum to simulate the actual power system grounding fault model, such as arc grounding, metal grounding, after the transition, such as resistance grounding. This test can also be used as an analysis of the power system neutral grounding and single-phase ground fault operation of the platform for us to better analysis of the actual run-time power system working state data to provide a practice.