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The authors produced induced voltages on a real-size distribution line, the height of which is 10meters. A balloon filled with helium gas lifted a 150 meter-long copper conductor near the overhead distribution line. A pulse current was applied to the above conductor. Induced voltages on the overhead distribution line were observed at three points. As the distance between the grounding point of a copper...
The article shows a possibility to measure the instant value of the consumed current in electrical devices or in branches of the electric power grid, without specialized sensors. As it is demonstrated, in some types of electrical networks the neutral conductor could be used as a current sensing device and as an energy source. The measuring of the voltage difference between the neutral conductor and...
The possibility to measure the instant current consumption of electrical devices or in branches of the electrical network, without specialized sensors, was evaluated. As it will be shown below, in some types of electrical networks the neutral conductor could be used as a current sensing device. Reading of the voltage difference between the neutral conductor and the protective conductor can supply...
This paper is an overview of the different types of grounding, bonding and alarming systems available throughout the world. There has been much confusion and discussion regarding the preferred method of grounding and bonding of power system on board vessels such as pleasure crafts, cargo and naval vessels. This paper will discuss the pros, cons, advantages and disadvantages of each method. It will...
This paper describes the results of calculating and measuring deviations of conducted disturbance voltages caused by differences in the arrangement of an artificial mains network (AMN) used to measure the voltage, for example, the height of the (AMN) from a horizontal reference ground plane and the connection between the AMN and the ground plane. The results indicated that the conducted disturbance...
A transient grounding grid numerical model is developed in this paper for calculation of grounding grip transient response fast and accurately¡£This model considers the ground as some conductor segments, each conductor section as a grounding unit. The transmission-line modeling method was used to this model. That is, each unit of grounding grid considered as a grounding body which contain inductance...
A connection between a phase conductor and the ground in MV networks is called earth fault. The fault current in this case does not depend on the point of the fault, but only on the total capacity (size) of a network. Distribution system operator (DSO) sometimes needs to operate the large network which means operating of the network with big capacitive current (in Czech Republic more than 800A). This...
The mechanisms from which lightning overvoltages can be produced on a power line depend on the system voltage. In medium voltage (MV) overhead distribution systems, lightning transients can be originated by either direct or indirect strokes. The main methods that can be adopted to improve the line lightning performance concern the increase of the critical flashover voltage (CFO) of the line structures,...
Firstly, the paper analyses overall present status of failure diagnosis of grounding grids and the latest technologies. Then it studies the commonly used methods in the area at present, including the relative method, the method according to detection the ground magnetic field and electric potential difference, the method of tabu search, the micro-disposal method etc, and compares their merits and...
Insulated conductor has many advantages and the insulated rate of 10 KV overhead distribution lines at present is considerably high; however, insulated conductor will surely break when stricken by lightning. The defect that relay protection may not act after the conductor is broken will bring an even greater hidden danger to the circuit. This paper describes the operation situation of lightning protected...
Misunderstandings concerning stray current and equipotential planes are prevalent in North America. Clarification of and differences between equipotentials found in high voltage cable and in concrete encased reinforcing bar installations in concrete pads and swimming pools are explained. Misunderstanding and false interpretation of the IEEE Standard 80, ldquoGuide for Safety in AC Substation Groundingrdquo...
The Distribution System Analysis Subcommittee (DSASC) has defined a simple test case for neutral-to-earth voltage calculations. This paper presents a solution in the Alternative Transients Program (ATP), with illustrations of both ldquostray voltagerdquo and ldquotemporary overvoltagerdquo. With scripting, stream-oriented editing, and text processing, the ATP may be used to perform sensitivity studies...
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