JPH0668780A - Accident electric current breaker - Google Patents

Abstract

PURPOSE:To improve breaking performance while eliminating imbalance in distributed flows, and dispense with special process control by inserting resistors to correct imbalance in resistance values of both fuses on contact surfaces between one clip and a connecting conductor. CONSTITUTION:Both end pieces 3 of respective clips 2 of both respective electric current fuses 1 are superposed upon both surfaces of both end parts of a connecting conductor 9, and are fastened to each other by means of bolts and nuts. Resistors 10 to correct imbalance in resistance values of both the fuses 1 are inserted on contact surfaces between one clip 1 and the connecting conductor 9, and are corrected so that resistance values of distributed circuits by both the fuses 1 in an electric current supply passage become equal to each other. Thereby, since the resistance values of the distributed circuits of both the fuses 1 connected in parallel to each other become equal to each other, imbalance in distributed flows can be eliminated, so that breaking performance can be improved. Since special process control to restrain dispersion of the resistance values of both the fuses 1 can be dispensed with, a cost increase can be prevented.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fault current in which two power fuses are connected in parallel to a current path and both fuses are blown to interrupt the fault current when the fault current flows through the current path. It relates to a circuit breaker.

[0002]

2. Description of the Related Art A conventional fault current interrupting device of this kind is shown in FIG.
7 to FIG. 7. In these figures, 1 is two power fuses connected in parallel, 2 is a clip holding one end of the fuse 1, 3 is end pieces at both ends of the clip 2, 4 is both clips 2 connected The mounting metal fitting 5 also serving as a connecting conductor is a support portion formed by being bent in an inverted U shape at the upper end of the mounting metal fitting 4, and the both end pieces 3 of both clips 2 are alternately tied together. The lower part of 4 is superposed and is fastened by bolts and nuts.

Reference numeral 6 is a current-carrying conductor of the current-carrying path, and 7 is a bolt, which is inserted through the washer 8 into the support portion 5 of the mounting member 4, and is screwed onto the lower end of the current-carrying conductor 6 to support both fuses 1. There is. Then, as shown in FIG. 7, the current I ₀ flowing through the current-carrying conductor 6 is divided into the currents I ₁ and I ₂ by the respective resistance values R ₁ and R ₂ of both fuses 1 and flows, and a fault current flows. At this time, both fuses 1 are blown and the accident current is cut off.

[0004]

In the above-described conventional circuit breaker, both power fuses 1 are instantly blown by an accident current to generate an arc, but both fuses 1 are broken due to the difference in resistance values R ₁ and R _2. There is a problem that imbalance occurs between the flowing currents I ₁ and I ₂ , the fault current having a smaller resistance value is increased, the interruption time becomes longer, and the fault current interruption performance is deteriorated.

On the other hand, in order to suppress the variations in the resistance values R ₁ and R ₂ of both fuses 1, a special control process for strictly controlling the thickness, length, etc. of the elements of the fuse 1 is required, and the cost is reduced. There is a problem that it will be up. The present invention has been made in consideration of the above points, and an object thereof is to provide an accident current interrupting device that eliminates the imbalance of shunt currents when an accident current flows and improves the interrupting performance, and that does not require special process control. And

[0006]

In order to solve the above-mentioned problems, the present invention holds one end of each of two power fuses connected in parallel by a clip, squeezes them, and connects a connecting conductor. In a fault current interrupting device that is connected to the current conductor of the current circuit and blows out both fuses when a fault current flows through the current circuit, the resistance value of both fuses should be applied to the contact surface between one clip and the connection conductor. A resistor for correcting the unbalance is inserted.

[0007]

The fault current interrupting device of the present invention constructed as described above has a resistor for correcting the imbalance of the resistance values of both fuses on the contact surface between one of the clips holding the power fuse and the connecting conductor. Since the shunt is inserted, the resistance values of the shunt circuits of both power fuses connected in parallel become equal, the imbalance of the shunt is eliminated, and the breaking performance is improved.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment will be described with reference to FIGS. 4 to 7, the same reference numerals designate the same or corresponding ones, 9 is a connecting conductor, and both ends 3 of each clip 2 of both power fuses 1 are superposed on both sides of both ends. However, it is fastened with bolts and nuts. Reference numeral 10 is a resistor for correcting the imbalance of the resistance values R ₁ and R ₂ of both fuses 1, which is inserted into the contact surface between one clip 1 and the connecting conductor 9 and which forms a shunt circuit of both fuses 1 in the energizing path. It has been corrected so that the resistance values are equal.

Then, the lower portion of the mounting member 4 is superposed on the central portion of the connecting conductor 9 and is tightened by bolts and nuts. It is fastened by. The connecting conductor 9 has an inverted T-shape, and its upper end is directly connected to the conducting conductor 6.
You may make it polymerize on the lower end part of.

[0010]

Since the present invention is configured as described above, it has the following effects. In the fault current interrupting device of the present invention, one end of each of two power fuses 1 connected in parallel is held by a clip 2 and a connecting conductor 9 connecting both clips 2 is connected to a conducting conductor 6 of a current path.
Since the resistor 10 for correcting the unbalance of the resistance values of both fuses 1 is inserted in the contact surface between the one clip 2 and the connecting conductor 9, the shunt circuit of both fuses 1 connected in parallel is connected. The resistance values of are equal, the imbalance of the shunt can be eliminated, and the breaking performance can be improved. Further, no special process control for suppressing the variation in the resistance value of both fuses 1 is required, and the cost increase can be prevented.

[Brief description of drawings]

FIG. 1 is a cutaway plan view of an embodiment of the present invention.

2 is a front view of a part of FIG. 1. FIG.

3 is a cut side view of FIG.

FIG. 4 is a cut plan view of a conventional example.

FIG. 5 is a front view of FIG.

6 is a cut side view of FIG.

FIG. 7 is a shunt circuit diagram.

[Explanation of symbols] 1 power fuse 2 clip 6 current-carrying conductor 9 connection conductor 10 resistor

Claims (1)

[Claims] 1. A clip holds one end of each of two power fuses connected in parallel, the clips are connected by a connection conductor, and the connection conductor is connected to a conduction conductor of a conduction path, In a fault current interrupting device designed to blow out both fuses when a fault current flows through a current-carrying path, a contact surface between one of the clips and the connecting conductor is for correcting an imbalance in the resistance value of the two fuses. A fault current interrupter with a resistor inserted.