The Research on Neutral Grounding Scheme of Fengxian 35kV and 10 kV Power Grid

Abstract

Combined with actual situation of Fengxian power Supply Company, the neutral grounding modes of Fengxian 35 kV and 10 kV power grid are studied in the paper. The different frequencies injected method is used to measure the capacitive current of Fengxian 28 substations, and the neutral grounding modes of the 28 substations are determined based on the measured values of capacitive current.

Optimal neutral ground resistor rating of the medium voltage systems in power generating stations

“…[3] Furthermore, NGR selection is a comprehensive task which involves many aspects of power system as shown in Figure 7. The following items are mainly considered when selecting NGRs: [7,8] • Charging current…”

“…Also different frequency injection method is widely used for the measurement of capacitive current. [8] In a resistance grounded system, the resistance must be low enough to allow the system capacitance to discharge relatively quickly. The level of fault current is commonly thought to be 10 A or less in ungrounded systems.…”

COMPARISON OF EARTHING TECHNIQUES FOR SINGLE LINE TO GROUND FAULT IN 11 kV DISTRIBUTION SYSTEM USING SIMULINK

“…Addressing the significance and influence of neutral grounding resistance method in 30kV Western Libyan power system network and explain the effect of this method in limiting and determining of the bolted single line to ground fault currents for a network fed by a single or multi sources in [4]. The methods which used to ground the neutral point of Shanghai Fengxian 35 kV and 10 kV power grid are discussed in [5]. Discuss the phasor diagram and flow directions of the faulted current in case of single phase to ground bolted fault when the HRG method is used in power system be done in [6].…”