Electricity: electrical systems and devices – Safety and protection of systems and devices – High voltage dissipation
Reexamination Certificate
2000-11-22
2002-11-19
Vortman, Anatoly (Department: 2835)
Electricity: electrical systems and devices
Safety and protection of systems and devices
High voltage dissipation
C361S119000, C361S106000, C361S111000, C361S113000, C337S229000
Reexamination Certificate
active
06483686
ABSTRACT:
FIELD OF THE INVENTION
The present invention relates to a power abnormality circuit, and especially to circuit for indicating abnormality of a three-mode surge absorber of a public electric power and a multiple-end fuse. Furthermore, the present invention provides a multiple-end fuse which is used to the circuit for indicating abnormality of a three-mode surge absorber of a public electric power.
BACKGROUND OF THE INVENTION
The general power receptacle for surge protection use metal oxide varistors or other transient/surge absorbers for suppressing surge wave. These elements will heat while absorbing surge wave, even a large surge wave may induce a short circuit. Therefore, temperature fuses or current fuses are used to prevent abnormality.
In general, the breakage of fuses is used to determine the abnormality of a surge protection indicator. However, in order to prevent the leakage current to the ground, in general, the indicator only displays the condition of the input ends of line-neutral mode while the conditions of line-ground mode and neutral-ground mode are not displayed.
Referring to
FIG. 1
, a circuit for indicating abnormality of a surge absorber is illustrated, which includes two surge absorbing devices
10
and
30
and an abnormal indication circuit
20
. The L-N ends in the three-mode in public power supply is connected to the surge absorbing device
10
in series. The surge absorbing device
30
is serially connected between the L-G and N-G ends. The surge absorbing device
10
has a two-end temperature sensing fuse
101
capable of severing from a temperature of 139° C. and a metal oxide vairstor
102
. When the metal oxide vairstor
102
has abnormality, it will heat gradually. Since it tightly presses against the two-end temperature sensing fuse
102
, the metal oxide vairstor
102
will heat and finally burn off the two-end temperature sensing fuse
101
so that the surge protection indicator
202
will extinguish due to no current flowing therethrough.
The surge absorbing device
30
has two metal oxide vairstors
301
and
302
and a two-end temperature sensing fuse
303
capable of severing from a temperature of 139° C. When the metal oxide vairstor
301
has abnormality, it will heat gradually. Since it tightly presses against the two-end temperature sensing fuse
303
, the metal oxide vairstor
301
will heat and finally burn off the two-end temperature sensing fuse
303
, but the two-end temperature sensing fuse
101
does not break off so that the surge protection indicator
202
will not extinguish. Namely, the fault of the surge absorbing device
30
of the L-G ends can not be detected. Furthermore, When the metal oxide vairstor
302
has abnormality, it will heat gradually. Since it tightly presses against the two-end temperature sensing fuse
303
, the metal oxide vairstor
302
will heat and finally burn-cut the two-end temperature sensing fuse
303
, but the two-end temperature sensing fuse
101
does not burn-cut so that the surge protection indicator
202
will not extinguish. Namely, the fault of the surge absorbing device
30
of the N-G ends can not be detected.
SUMMARY OF THE INVENTION
Accordingly, the primary object of the present invention is to provide a circuit for indicating abnormality of a three-mode surge absorber and a multiple-end fuse.
Another object of the present invention is to provide a circuit for displaying abnormality of a three-mode surge absorber of a public electric power, in which a current sufficient to cut off a third end flows through a first and a second end of a two-end fuse and at the same time, the third end is cut off so that the third end is isolated from the first and second ends completely.
To achieve above objects, the present invention provides a circuit for indicating abnormality of a three-mode surge absorber of a public electric power. The circuit is serially connected between the input end and output end of a public electric power supply for indicating the abnormality of a three-mode surge absorbing device of a public power supply so as to provide an obvious indication to the users. The circuit for indicating abnormality of a three-mode surge absorber of a public electric power of the present invention includes a first surge absorbing device coupled to the line input end and the neutral input end for absorbing a surge between the line input end and the neutral input end; a first three-end fuse coupled to the first surge absorbing device and the line input end for preventing abnormality of parts; an abnormal indication circuit coupled to the first three-end fuse for indicating the abnormality of three-mode in public power supply; a second surge absorbing device coupled to the abnormal indication circuit, the neutral input end and the ground input end for absorbing a surge between the neutral input end and the ground input end; and a second three-end fuse coupled to the neutral input end and the second surge absorbing device for preventing the abnormality of parts.
The present invention further provides a multiple-end fuse, wherein at least one end is added to a two-end fuse, when a current sufficient for the two-end fuse to break out flowing through a first end and a second end of the two-end fuse, a third end or other ends are cut off so that the third end or other ends are completely isolated with the first or the second end.
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Troxell Law Office PLLC
Vortman Anatoly
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