Title :
Novel measurement system for grounding impedance of substations and power plants
Author :
Zhang, Bo ; Zeng, Rong ; He, Jinliang ; Sun, Weimin ; Yao, Jinxia ; Su, Qi ; Han, Se-Won ; Han-Goo-Chu
Author_Institution :
Dept. of Electr. Eng., Tsinghua Univ., Beijing, China
Abstract :
A new grounding impedance measuring method based on short lead wire of current electrode and a frequency inverter AC source is proposed. The compensating site of the voltage electrode to obtain the real grounding resistance of the grounding system is analyzed according to soil structure, topological structure of the grounding system under test, and the length of current electrode´s lead wire. This new method measures the ground impedance at a variety of frequencies other than power frequency, then interpolates them to reach the ground impedance at power frequency. The mutual inductance between the potential and current wires is analyzed and computed. The Intel 80C196KC cored grounding impedance measurement system is developed and the software is programmed. A field test was performed in the substation and the system worked stably
Keywords :
DC-AC power convertors; computerised instrumentation; earthing; electric impedance measurement; invertors; power engineering computing; power system measurement; power system protection; substations; voltage measurement; Intel 80C196KC cored grounding impedance measurement system; current electrode; frequency inverter AC source; grounding resistance; power plants; software; soil structure; substation grounding impedance measurement system; topological structure; voltage electrode compensating site; Current measurement; Electrical resistance measurement; Electrodes; Frequency measurement; Grounding; Impedance measurement; Soil measurements; Substations; System testing; Wire;
Conference_Titel :
Power System Technology, 2000. Proceedings. PowerCon 2000. International Conference on
Conference_Location :
Perth, WA
Print_ISBN :
0-7803-6338-8
DOI :
10.1109/ICPST.2000.898172
