Comparison of Residual Current Devices Tripping Characteristics: for Selected Residual Current Waveforms

Czapp, S.
May 2010
Electronics & Electrical Engineering;2010, Issue 100, p7
Academic Journal
According to the international standards circuits for electrical devices in the area of high risk of electrocution should be protected by high sensitivity residual current devices. In order to achieve effectiveness of protection against electric shock, residual current devices should be capable of detecting a waveform of residual current under the given conditions. Laboratory tests performed by the author indicate that tripping current of residual current devices is strictly dependent on the residual current waveform. In some cases the tripping current for a distorted residual current may be much higher than for a sinusoidal waveform. For residual current with high-order harmonics, as in circuits with variable speed drives, some residual current devices do not trip at all. In the paper a comparison of tripping current of residual current devices for various residual current waveforms is presented. The impact of the waveform of residual current on the effectiveness of protec-tion against electric shock with the use of residual current devices is discussed.


Related Articles

  • The Effect of the Zero Sequence Component on the Evaluation of the Series APF Apparent Power. Kouzou, A.; Mahmoudi, M. O.; Boucherit, M. S. // International Review of Electrical Engineering;Nov/Dec2009 Part B, Vol. 4 Issue 6, p1357 

    The main purpose of this paper is the study of the effect of the zero sequence components in the evaluation of the apparent power, which is intended to be used in the evaluation of the performance and the process design of the Series Active Power Filter (SAPF). The capability of the SAPF is...

  • GFCI Self-Test and Power Denial. Franks, Ryan // Electroindustry;Oct2012, Vol. 17 Issue 10, p26 

    The article highlights the ground-fault circuit interrupters (GFCI), which has reduced electrocutions in residential settings due to increased adoption as mandated by the National Electric Code.

  • Non-ideal op-amp circuit analysis. Wuqiang Yang // International Journal of Electrical Engineering Education;Jan2010, Vol. 47 Issue 1, p73 

    Op-amps are commonly used by instrumentation engineers. In the ideal case, the open-loop gain of an op-amp is regarded as infinite, the input impedance as infinite, and the output impedance as zero. In many cases, however, it is necessary to estimate the performance of an op-amp circuit with...

  • HIGH-EFFICIENCY RF-RECTENNA DESIGN. Visser, Hubregt; van Beurden, J. Theeuwes; Doodeman, G. // EDN;7/5/2007, Vol. 52 Issue 14, p34 

    The article presents the design of a high-efficiency RF-rectenna. Composed of a Schottky diode and an antenna, a rectifying antenna or rectenna converts the RF power it receives at the antenna into direct current voltage. The concern is maximizing the power conversion efficiency of these...

  • The Study on the Wireless Power Transfer System for Mobile Robots. Hyung-Nam Kim; Won-Yong Chae; Dong-Sul Shin; Ho-Sung Kim; Hee-Je Kim // World Academy of Science, Engineering & Technology;Feb2011, Issue 50, p182 

    No abstract available.

  • Demonstration of a 4H SiC betavoltaic cell. Chandrashekhar, M. V. S.; Thomas, Christopher I.; Hui Li; Spencer, M. G.; Lal, Amit // Applied Physics Letters;1/16/2006, Vol. 88 Issue 3, p033506 

    A betavoltaic cell in 4H SiC is demonstrated. A p-n diode structure was used to collect the charge from a 1 mCi Ni-63 source. An open circuit voltage of 0.72 V and a short circuit current density of 16.8 nA/cm2 were measured in a single p-n junction. A 6% lower bound on the power conversion...

  • Single Wire Electrical System. Bank, Michael // Engineering;Nov2012, Vol. 4 Issue 11, p713 

    The purpose of this article is to remind of the past and present problems of creating single wire electrical systems. This article presents a new one wire electrical transmission system named B-Line which uses one line only and does not use ground as a second line. The proposed method is to work...

  • Three-Phase Shunt Active Power Filter. George, Moleykutty; Basu, Kartik Prasad // American Journal of Applied Sciences;2008, Vol. 5 Issue 8, p909 

    Active power filters have been widely used for harmonic elimination. The performance of a conventional three-phase shunt Active Power Filter (APF) using Synchronous Detection Method (SDM) has been compared with Nonlinear Autoregressive-Moving Average (NARMA)-L2 based APF. The novelty of this...

  • Reassessment of Permissible Negative Sequence Current for Power Plant Operation of Taipower. Ping-Heng Ho; Chi-Jui Wu; Chung-Liang Chang; Yuin-Hong Liu // Communications & Network;Nov2010, Vol. 2 Issue 4, p271 

    The N3 power plant of Taipower is located in the southern tip of Taiwan and connected to the power pool by four out-linking 345-kV overhead transmission circuits. There are two 951-MW generators. Each generator occupied 11% of the system peak load in 1985 when the generator was in commercial...


Read the Article


Sorry, but this item is not currently available from your library.

Try another library?
Sign out of this library

Other Topics