Factors affecting selection, installation and coordination of surge protective devices for low voltage systems

Kisielewicz, T.; Piparo, G.B. Lo; Fiamingo, F.; Mazzetti, C.; Kuca, B.; Flisowski, Z.

doi:10.1016/j.epsr.2014.02.038

Cited by 24 publications

(11 citation statements)

References 5 publications

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“…At the moment of zero crossing of i GDA at this configuration of overvoltage protection the electric arc extinguishes and does not re-ignite. This was a case of coordinated overvoltage protection [17,18]. The next case of the overvoltage protection computation had identical configuration as the previous one.…”

Section: Computation Of Parameters Regarding An Overvoltage Protectiomentioning

confidence: 99%

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Impact of line length on the operation of overvoltage protection in LV networks

Ribič

2015

Electric Power Systems Research

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a b s t r a c tThis paper deals with analysing the impact of LV lines impedance on the operation of overvoltage protection, especially on the operation of gas discharge arresters. A model of the overvoltage protection with all elements (gas discharge arrester and metal-oxide surge arrester) was developed within a Simulink/Matlab environment for this purpose. This model of LV line is presented as a model for the computation of transients. Computations were carried out for various line lengths and various combinations of overvoltage protection elements. On the basis of analyzing the models responses, an analysis was made on the impact of the impedance of LV lines on the ability of self-extinguishing the gas discharge arrester. Some additional measures are also proposed for achieving the proper operation of overvoltage protection.

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Section: Computation Of Parameters Regarding An Overvoltage Protectiomentioning

confidence: 99%

“…The current through the MO surge arrester i MOV (t) stayed low due to the shape of the overvoltage surge wave. This was a case of uncoordinated overvoltage protection [17,18]. 5.5.…”

Section: Computation Of Parameters Regarding An Overvoltage Protectiomentioning

confidence: 99%

Impact of line length on the operation of overvoltage protection in LV networks

Ribič

2015

Electric Power Systems Research

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“…Finally, the standard IEC 62353 permits that the maximum value of resistance between the earth terminal of the mains plug and the protectively earthed accessible conductive parts of the MEE be equal to 300 mΩ. Hence, in the circuit model of the surgical layout used in the simulations the PE conductors comply with such admissible values and the isolation to earth of the secondary winding is modeled with two stray capacitances of each phase conductor to earth [12].…”

Section: Electrical Circuit Model Of a Medical It Supply Systemmentioning

confidence: 99%

Evaluation of microshock risk during a surgical procedure

Amicucci¹,

Zennaro²,

Fiamingo³

et al. 2015

WIT Transactions on the Built Environment

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During a surgical procedure, risk assessment is important in order to prevent undesired patient's ventricular fibrillation. Even weak currents flowing through the heart of a patient are potentially able to cause such a dangerous event. The hazard can be reduced through the adoption of suitable protection measures, chosen by means of an in-depth investigation of the microshock probability. Such a probability is obtained by the product of the probability of ventricular fibrillation when certain fault conditions occur and the probability of occurrence of the considered fault conditions. The fault conditions here considered are able to determinate certain values of the leakage current that can flow through the patient's body. A method for the microshock probability assessment is presented based on the leakage current estimation that is obtained by simulation of an electrical circuit model of a typical surgical layout. The layout in question is composed of an operating table, a patient monitor and a defibrillator; all supplied by a medical IT system. Leakage currents flowing from this medical equipment to the chest of the patient, are measured in normal and in fault conditions. The permitted leakage current values are obtained by the international standard IEC 60601-1, and an estimate of the probability of

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“…It is a relative economic and efficient measure which can assure the normal operation of apparatus to be protected. The protection system efficiency depends on various factors, namely proper selection of SPD and installations conditions [6,7]. In practice proper selection of SPD is related to the choice of the discharge current (I imp or I n ) and of the protection level (U p ) taking into account the rated impulse level (U w ) of the apparatus to be protected.…”

Section: Introductionmentioning

confidence: 99%