Analysis of Selected Models of Body Impedance in the Assessment of Electric Shock Possibility in the Ship’s Power Supply Grids Cover

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Analysis of Selected Models of Body Impedance in the Assessment of Electric Shock Possibility in the Ship’s Power Supply Grids

Acta Mechanica et Automatica

Volume 19 (2025): Issue 3 (September 2025)

By: Arkadiusz FRĄCZ

Open Access

|Sep 2025

Figures & Tables

Typical ship’s electric network [12]

Typical ship’s electrical grid insulation status control system [12]. 1 – DC voltage source, 2 – Insulation resistance meter (Megohmmeter), 3 – singal relay, 4 – limiting resistor, 5 – inductor (suppressor), 6 – DC component blocking capacitor

Single phase earth-fault in ship’s electrical network with neutral point isolated. A – earth-fault point [13]

Human body electrical shock circuit in the ship’s electrical grid

Simplified resistive Model (A) of human body impedance [24,25]

IEC 60990 Model (B) of human body impedance [14]

V. De Santis Model (C) of human body impedance [15]

Freiberger Model (D) of human body impedance [16]

MATLAB-Simulink model utilized for analysis

Earth fault current obtained for tested models

Impact of changes in the supply voltage Uz on the value of the shock current IR

Impact of changes in the supply voltage frequency f on the value of the shock current IR

Impact of changes in the insulation resistance Riso on the value of the shock current IR

Impact of changes in Ground capacitance CE on the value of the shock current IR

Analysis of the impact of changes in insulation resistance Riso on the value of shock current IR – selected points

		Insulation resistance R_iso [kΩ]
		1000	800	600	500	400	300	200
*Shock current I_R* [A]**	A	0,0300	0,0301	0,0301	0,0301	0,0300	0,0299	0,0299
	B	0,0288	0,0287	0,0287	0,0286	0,0286	0,0285	0,0284
	C	0,0244	0,02522	0,0233	0,0253	0,0237	0,0240	0,0249
	D	0,0249	0,0249	0,0248	0,0248	0,0247	0,0247	0,0245
		*Insulation resistance R_iso* [kΩ]**
		100	50	40	30	20	10	1
*Shock current I_R* [A]**	A	0,0301	0,0314	0,0324	0,0346	0,0399	0,0580	0,173
	B	0,0282	0,0286	0,0294	0,03083	0,0345	0,0465	0,0995
	C	0,0245	0,0253	0,0265	0,0269	0,0304	0,0386	0,0780
	D	0,0243	0,0247	0,0252	0,0263	0,0292	0,0382	0,0695

Analysis of the impact of changes in the supply voltage frequency f on the value of the shock current IR – selected points

		Supply voltage frequency f [Hz]
		48,5	48,5	48,5	48,5	48,5	48,5	48,5
*Shock current I_R* [A]**	A	0,0296	0,0298	0,0299	0,0301	0,0303	0,0306	0,0296
	B	0,0283	0,0285	0,0286	0,0288	0,0289	0,0292	0,0283
	C	0,0245	0,0245	0,0245	0,0252	0,0244	0,0254	0,0245
	D	0,0246	0,0248	0,0248	0,0249	0,0250	0,0252	0,0246

Analysis of the impact of changes in ground capacitance CE on the value of shock current IR – selected points

		Ground capacitance C_E [μF]
		0,05	0,1	0,14	0,5	1	2	3
*Shock current I_R* [A]**	A	0,0109	0,0216	0,0301	0,0982	0,1583	0,2037	0,2177
	B	0,0107	0,0210	0,0288	0,0764	0,0994	0,1101	0,1130
	C	0,00973	0,0189	0,0244	0,0519	0,0726	0,0812	0,0782
	D	0,0102	0,0189	0,0249	0,0534	0,0647	0,0709	0,0728
		*Ground capacitance C_E* [μF]**
		4	5	6	8	10	20	30
S h	A	0,2234	0,2260	0,2278	0,2296	0,2304	0,2311	0,2316
	B	0,1140	0,1148	0,1151	0,1155	0,1157	0,1160	0,1162
	C	0,0864	0,0874	0,0876	0,0884	0,0890	0,0901	0,0899
	D	0,0739	0,0746	0,0750	0,0754	0,0756	0,0761	0,0763

Analysis of the impact of changes in the supply voltage Uz on the value of the shock current IR – selected points

		Supply voltage U_Z [V]
		360	370	380	390	400	410	420
*Shock current I_R* [A]**	A	0,0271	0,0279	0,0286	0,0293	0,0301	0,0308	0,0316
	B	0,0259	0,0266	0,0273	0,0280	0,0288	0,0295	0,0302
	C	0,0215	0,0231	0,0239	0,0243	0,0252	0,0259	0,0264
	D	0,0224	0,0230	0,0236	0,0243	0,025	0,0255	0,0261

DOI: https://doi.org/10.2478/ama-2025-0046 | Journal eISSN: 2300-5319 | Journal ISSN: 1898-4088

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Language: English

Page range: 391 - 397

Submitted on: Feb 7, 2025

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Accepted on: Jun 22, 2025

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Published on: Sep 5, 2025

Published by: Bialystok University of Technology

In partnership with: Paradigm Publishing Services

Publication frequency: 4 issues per year

Keywords:

human body impedance,

electric shock protection,

ship’s power supply network

Related subjects:

Electrical engineering,

Mechanical engineering,

Bioengineering and biomedical engineering,

Civil engineering,

Environmental engineering

© 2025 Arkadiusz FRĄCZ, published by Bialystok University of Technology
This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 License.

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