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The experiments and theoretical considerations about several cable configurations grounded at both ends are described. The theory of magnetic coupling and shielding is reviewed. In the experiment, a constant magnetic field is generated at 4 frequencies and 10 different cable configurations are tested at each frequency. 40 measurement results are presented and they are compared with 6 measurements...
Grounding structure of the shielded cable at the high voltage battery side and that of the power converter chassis have significant influences on common-mode current emitted from a converter such as a DC-DC converter in electric vehicles. In this paper, the equivalent circuit focused on the common-mode current is established to comprehend the circuit functionality of the grounding structures. From...
In Variable Frequency Drive (VFD) systems, long motor leads can have many detrimental effects, including cable charging current, overvoltage at the motor terminals, and voltage stress on power modules. Different types of AC system grounding can also interact with long motor leads to yield undesirable effects on drive operation. Analyzing models of various components of a drive system is useful to...
The ampacity of underground power cable lines is limited by the maximal allowable temperature of the conductor. Normally the IEC 60287 standard is used for steady state ampacity calculation. The standard employs the concept of thermal equivalent circuit. An alternative to the standard is the finite element (FEA) simulation of electromagnetic and thermal field around cables. This paper presents a systematic...
Concentric neutral cable system is a most popular practice in distribution systems of North America. Because of the special structure of this type of cable, the concentric neutral conductor serves as a current-carrying conductor and the neutral current can't be measured directly. The potential over loading of neutral conductor may result in cable over-heating. In order to understand the neutral current...
An original circuit model is presented for analyzing current distribution of a tower on lightning stroke. Electrical parameters of steels are determined by a serial of approximate calculating. Several profound references are provided — the earth resistivity and the lightning position can not affect the branch current of antenna cable jacket; grounding conductor's current is only determined by the...
IEC grounding terminology provides concise descriptions of system configurations requiring a sentence or more using familiar North American verbiage. However, without relation to known systems, simple representations using only five letters of the alphabet join the list of meaningless acronyms that clutter our life. This paper begins with definitions of the five letters used to describe IEC grounding...
This article presents a summary of the standard design procedures successfully used by several Brazilian utilities to control electromagnetic interferences in power plants, substations and telecommunication installations. Those users stated in articles and conferences that the reported procedures controlled very well the interference problems in their facilities. The article shows that usual cable...
Continuously corrugated welded (CCW) armored type cables, UL designated as Type MC-HL are being specified and used in all types of oil and gas, industrial, commercial, utility, installations to supply electrical power to motors, pumps, fans, and other equipment. A large percentage of these cables are extensively used in the petrochemical industry. Its use has become so wide spread that the National...
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