Performance criteria for current-limiting power fuses — II

Boehne, E. W.

doi:10.1109/ee.1946.6440025

Cited by 2 publications

(2 citation statements)

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“…Consideration of AC power supplies introduces another variable into the fault circuit, namely the phase in the supply voltage cycle when the fault is applied, referred to as the closing angle. Boehne (1946) and Toniolo and Cantarella (1969) have studied the prearcing phase in circuits of power factor of 0 and 0.2 respectively. Their results enable the prearcing energy for a given fuse to be evaluated as a function of closing angle and fault current; however, the possibility of a maximum is not considered.…”

Section: Introductionmentioning

confidence: 99%

Optimum conditions for testing electrical fuses. I. Maximization of prearcing energy

Wheeler¹

1976

J. Phys. D: Appl. Phys.

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The prearcing energy in DC and AC fault circuits is evaluated assuming constant circuit parameters and adiabatic heating of the fuse link. This energy is maximized with respect to prearcing and closing times for circuits of prescribed time constant or of prescribed frequency and power factor. Maximum energies are presented as a function of power factor together with the associated optimum values of closing angle, arcing angle, cut-off ratio and prospective current. These results are expressed in terms of parameters that enable application to most fuses and supply circuits. The optimum closing angles, arcing angles and cut-off ratios are dependent only on the power factor; the fuse link parameters influence only the energy and prospective current, while the supply voltage influences only the energy.

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Section: Introductionmentioning

confidence: 99%

Optimum conditions for testing electrical fuses. I. Maximization of prearcing energy

Wheeler¹

1976

J. Phys. D: Appl. Phys.

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“…This maximum and the associated optimum parameters were accurately located by Wheeler (1972). Circuits energised by AC supplies were first analysed by Boehne (1946) and Toniolo and Cantarella (1969) for power factors of zero and 0.2 respectively, but they did not investigate the possibility of an overall maximum in the stored magnetic energy. Wheeler (1973) studied circuits of various power factors and pointed out that an overall maximum in magnetic energy must exist at some optimum time of fault occurrence.…”

Section: Introductionmentioning

confidence: 99%

Optimum conditions for testing electrical fuses. II. Maximisation of total arcing energy

Wheeler¹

1981

J. Phys. D: Appl. Phys.

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For pt.I see ibid., vol.9, no.12, p.1809-16 (1976). The total arcing energy for a fuse link of uniform cross-section in an AC circuit of known power factor is evaluated assuming adiabatic heating of the link and a constant voltage fuse arcing characteristic. It is shown that this energy maximises for optimum values of the closing angle and prospective current. The maximum and optimum parameters are expressed in units involving the supply voltage and fuse link properties and presented as a function of fuse arcing voltage and circuit power factor. In particular, for fuse testing applications, the tolerance on closing angle and prospective current is determined in order that the arcing energy should be at least 95% of its maximum value.

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Performance criteria for current-limiting power fuses — II

Cited by 2 publications

References 0 publications

Optimum conditions for testing electrical fuses. I. Maximization of prearcing energy

Optimum conditions for testing electrical fuses. I. Maximization of prearcing energy

Optimum conditions for testing electrical fuses. II. Maximisation of total arcing energy

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