Testing of the fire-proof functionality of cable insulation under fire conditions via insulation resistance measurements

Polanský, Radek; Polanská, Markéta

doi:10.1016/j.engfailanal.2015.08.001

Cited by 24 publications

(16 citation statements)

References 41 publications

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“…Then the resistance continuously dropped for a period of time. When the resistance was close to the critical value of 10 5 Ω, the insulation resistance suddenly dropped again, and it dropped to about 10 Ω in an instant [15][16][17]23,[35][36][37]. However, there was no consistent standard for how to judge the cable failure with insulation resistance.…”

Section: Installation and Test Methods Of Specimensmentioning

confidence: 99%

“…These articles describe the carrying out of experiments or numerical simulations on the propagation direction and velocity of the flame on a cable, the combustion temperature distribution, toxic gas diffusion, and other parameters, and they reveal the characteristics of cable fire [7][8][9][10][11][12][13][14]. Some experimental research studies and numerical calculations about cable failure have mainly focused on the direct fire protection of cables [15][16][17][18][19][20][21][22]. Polanský et al [15] used fire barriers made from mica glass tape and from ceramifiable silicone rubber to protect cables and to monitor the insulation state of cables during fire testing.…”

Section: Introductionmentioning

confidence: 99%

“…Some experimental research studies and numerical calculations about cable failure have mainly focused on the direct fire protection of cables [15][16][17][18][19][20][21][22]. Polanský et al [15] used fire barriers made from mica glass tape and from ceramifiable silicone rubber to protect cables and to monitor the insulation state of cables during fire testing. This study provided ideas for the fire-resistant design of cable insulation sheaths, and it proved that it was appropriate to judge the state of cables by measuring the insulation resistance of cables.…”

Section: Introductionmentioning

confidence: 99%

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Experimental Study on Delaying the Failure Time of In-Service Cables in Trays by Using Fire-Retardant Coatings

et al. 2021

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Improving the fire resistance of the key cables connected to firefighting and safety equipment is of great importance. Based on the engineering practice of an oil storage company, this study proposes a modification scheme that entails spraying fire-retardant coatings on the outer surface of a cable tray to delay the failure times of the cables in the tray. To verify the effect, 12 specimens were processed using five kinds of fire-retardant coatings and two kinds of fire-resistant cotton to coat the cable tray. The specimens were installed in the vertical fire resistance test furnace. For the ISO 834 standard fire condition, a fire resistance test was carried out on the specimens. The data for the surface temperature and the insulation resistance of the cables in trays were collected, and the fireproof effect was analyzed. The results showed that compared with the control group, the failure time of the cable could be delayed by 1.57–14.86 times, and the thicker the fire-retardant coatings were, the better the fireproof effect was. In general, the fire protection effect of the fire-retardant coating was better than that of the fire-resistant cotton.

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Section: Installation and Test Methods Of Specimensmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Experimental Study on Delaying the Failure Time of In-Service Cables in Trays by Using Fire-Retardant Coatings

et al. 2021

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“…In the study, the tensile strength elongation at break, tear Resistant, abrasion Resistant on cable, oxygen index and acid gas tests were conducted by authors (Jacint ROVIRA, Montserrat PRAT, Juan de Dios MARTÍNEZ, 2003:59). The other study for the different designs for low-fire-hazard cables were tested under conditions the fire test speciefied in IEC 60331-21 was perfomed by R. Polansky and M. Polanska in 2015. In the study, The measurement set-up adapted to enable insulation Resistance measurements throughout the entire fire test. The results of the tests demonstrate that the measurements of the insulaiton Resistance together with the use of thermocouples placed near the cable sheath and between the insulated cable cores can yield important insight into the processes (R. Polansky, M. Polanska, 2015-57) In this study, the standard K23 cable design was used first step.…”

Section: Introductionmentioning

confidence: 99%

Development and Evaluation of Fire Resistant Railway Signalling Cable

HARTOMACIOĞLU¹,

MUTLU²,

MERCAN³

et al. 2021

European Journal of Science and Technology

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The railway signalling cable is designed for remote control and teletransmission in underground railway networks. It is very critical situation that the railway signalling cable continues to transmit data in the event of a fire. In this study, the fire resistant test performance of railway signalling cable has been developmented and evaluated via experimental research. A standard railway signalling cable generally consists of conductor, insulation, laying-up, wrapping, screen, inner sheath, armour and outher sheath. The mica tape was added as one layer with 30% overlapping to produce desired fire resistant cable. First step, the railway signalling cable produced used only mica tape used, results show that the cable with mica tape is successful at 110 V. Also, it is not bad for the 250V as it seen the test results. After having non satisfied results, glass tape was added additionally over inner sheath (instead of PP tape) for better results for higher voltage values. After redesign of the cable with addition of glass tape over inner sheath, better results were expected but the results were not as good as expected. Only at 250V appropriate results were achieved according to both IEC 60331 -21 & 60331-2 standard. When we examined the situation, we saw that the cable was flattened a bit after the new-design. Then, the reproduction of the new design cable (mica + glass tape) is been planned without any rework process. All results show that the new design railway signalling cable is resistant to fire tests according to IEC 60331-21, IEC 60331-1&2 up to 1000V as shown in the paper.

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“…For these applications, special cables are used that can maintain the integrity of the circuit during a fire. The issue of electrical cables and organic polymers (which are components of electric cables) and the heat of combustion and circuit integrity during a fire have been examined in many scientific papers [13][14][15].…”

Section: Introductionmentioning

confidence: 99%

A New Approach to the Assessment of the Reduction in Visibility Caused by Fires of Electrical Cables

Martinka

Rantuch

Rolinec

et al. 2019

Safety

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Electricity is the most important form of household energy and one of the most important forms of energy for industry and transport. Electrical distribution in construction and transport is almost exclusively implemented using electrical cables. One of the unresolved problems associated with electrical cables is the release of smoke and the resulting reduction of visibility in case of fire in the area. In this study, a new approach was developed to assess the reduction of visibility in an area affected by an electrical cable fire. This approach is based on the determination of the critical ratio of smoke volume (in the smoke layer and exhausted from the fire compartment) to the length of the burning cable, through which the visibility of reflective and illuminated signs was reduced to a lower limit value (a standard of 10 m). The input data for this approach was the extinction area of the smoke released from one meter of burning cable and the length of the cables in the area. This approach was used to test two power cables (CHKE-V J3x1.5 and CHKE-R J3x1.5) and one signal cable J-H(St)H 1 × 2 × 0.8 with the B2ca, s1, d1, a1 fire reaction class. The smoke extinction area of the examined cables was determined using a cone calorimeter at a heat flux of 50 kW/m2. The obtained data showed that in order to maintain a visibility of 10 m for reflective signs, the critical ratio of smoke volume to length of burning cable was 7.5 m3/m. For illuminated signs, the critical ratio was 2.8 m3/m. The relationship between burning length and visibility allows the calculation of visibility in the fire compartment affected by cable fire only from cables length.

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Testing of the fire-proof functionality of cable insulation under fire conditions via insulation resistance measurements

Cited by 24 publications

References 41 publications

Experimental Study on Delaying the Failure Time of In-Service Cables in Trays by Using Fire-Retardant Coatings

Experimental Study on Delaying the Failure Time of In-Service Cables in Trays by Using Fire-Retardant Coatings

Development and Evaluation of Fire Resistant Railway Signalling Cable

A New Approach to the Assessment of the Reduction in Visibility Caused by Fires of Electrical Cables

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