KR820001199Y1 - Power breaker apparatus - Google Patents

Abstract

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Description

Power breaker

1 is an electrical opening diagram when the power interrupter is operated.

2 is an explanatory diagram of current limiting characteristics by permanent fuse.

3 is a layout view of a power interruption device.

4 is a structural diagram of parallel resistance of the power interruption device according to the present invention.

The present invention relates to a power interruption device that detects an abnormal current quickly when an abnormal current flows due to a short circuit of the load, and cuts off power supply to the load.

This type of current interruption device is provided with a permanent fuse (PF) and a parallel resistance (R) in the fuse as shown in FIG. 1, and these are the branching circuits (B) and branches provided in various load circuits. It is inserted and connected between the breakers F _{1 to} F _n .

The permanent fuse (PF) rapidly increases in resistance when an accident current flows, but the relationship between the resistance value (P _PF ) and the parallel resistance (R) of the normal permanent fuse (PF) is R _PF <R, which is normal. The ratio of the electric currents of all the time passes through the permanent fuse PF.

For example, if a short circuit occurs in the branch load (F ₁ ) circuit, a fault current flows through the permanent fuse (PF), and the internal resistance of the permanent fuse rapidly increases, resulting in more than several hundred times the initial resistance, thereby reducing the fault current. At the same time, the branch breaker F ₁ is operated by flowing a limiting current to the branch breaker F ₁ through the parallel resistance R.

2 shows the limitation of the fault current, and when the fault current (I pros) flows, the internal resistance of the permanent fuse (PF) increases rapidly to operate the current limiting operation. Suppress with I _pfc .

Then, the resistance value of the permanent fuse (PF) is larger than the parallel resistance value (R), so that the fault current flows continuously through the permanent fuse (PF) and the resistance (R) and the current of I _pfR flows, and the branch breaker (F ₁ ) Activate

The conventional power interruption device is comprised as mentioned above. The estimated short-circuit current maximum peak value (IC) is limited to the current limit maximum peak value (I _pfc ) by the permanent fuse (PF), but generates an abnormal voltage between the parallel resistance (R) and the connecting conductor during the current limit operation. The arc resistance caused the loss of parallel resistance.

The present invention is to eliminate the drawbacks, and to provide an electric power cut-off device for preventing the generation of arc by insulating the both ends of the parallel resistance.

Hereinafter, an embodiment of the present invention will be described with reference to the drawings.

In Fig. 3, (1) the power supply side conductor, (2) the connection conductor, (3) the fin for heat dissipation, (4) the current terminal of the permanent fuse, (5) the permanent fuse, and (6 ) Is the current terminal of the permanent fuse (5), (7) is a heat sink fin, (8) is a connecting conductor, (9) is a load side conductor, and (10) is a parallel resistance.

4, the structure of the parallel resistance 10 is explained in full detail.

(11) is a spacer having an appropriate plate thickness or a copper spacer in which a plurality of sheets are laminated, and the parallel resistance (10), between the power supply side conductor (1) and the load side conductor (9). It arrange | positions and it is a fixed body part as the screw 15 and the nut 16 for body parts.

An insulating tube 14 and an insulating washer 13 are used on the outer periphery of the body screw 15 so that resistance of only the parallel resistance 10 is added to the circuit between the power supply side conductor 1 and the load side conductor 9.

As a result, the body screw 15 and the nut 16 are completely insulated in the live part.

At both ends of the parallel resistance 10, the insulating coating 12 is made of silicon tape or the like.

In the above configuration, the normal power feeding is moved from the power supply side conductor 1 to the current terminal 6 on the opposite side through the connecting conductor 2, the permanent fuse current terminal 4, and the permanent fuse 5, thereby connecting the connection conductor. (8) and the load side conductor (9).

In normal operation, since the resistance value of the parallel resistance 10 is several hundred times larger than the internal resistance value of the permanent fuse 5, no current flows in the parallel resistance 10.

Now, when a short circuit occurs at the branch load, a short circuit fault current I pros flows as shown in FIG.

Due to the heat generated by the fault current, the internal element of the PF undergoes a phase change in the order of solid-liquid-gas, becomes extremely high resistance, and starts the current limit.

The current limit peak by this permanent fuse is suppressed at I pfc in FIG.

At this time, the resistance value of the permanent fuse (5) is greater than the parallel resistance value (10) and the fault current flows through the parallel resistance (10) and the permanent fuse (5) the current of the I _PFC .

In this current-limiting operation, overvoltage E _fm occurs.

F _fm = I · _{R pfc}

I _pfc is the wave current peak, and R is the parallel resistance.

This voltage E _fm is across the contact surface of the If increases as the short circuit current 200KA voltage increases the value of E _fm and the third degree byeongyeol resistors (10 and the connection conductor (1) and (9) between, or byeongyeol resistor 10 Although arc may occur in the vicinity of, since the insulation resistance 12 is formed in the parallel resistance 10 as described above, such arcing does not occur.

In addition, in the above embodiment, the insulation coating 12 is applied only to both ends of the parallel resistance 10, but may be applied to the entire surface.

In addition, the connecting conductors (1) and (9) are fixed to the rigid (RIGID) in the flame body of the case where the power interrupting device of the present invention is installed, and the bending angle of the L-shaped portion is not constant as a work error. The gap between the good conductors (1) and (9) is not necessarily constant, and a gap is formed between the parallel resistances 10, and the point contact state is not in contact with the surface of the parallel resistances 10 due to the inclined contact. However, since the present invention has provided the conductive spacer 11, the connecting conductors 1 and 9 and the parallel resistance 10 can be brought into surface contact, and there is no gap between them. Arc can be prevented from occurring in this part.

As described above, the power cutoff device of the present invention has a countermeasure against arcing resistance, so that the power cutoff device can completely cut off the power even if it is applied to the short circuit current 200KA or the like, and greatly increase the breaking capacity.

Claims (1)

A parallel resistor (10) connected in parallel to the permanent fuse (5) through a connecting conductor (2) (8) having a pair of terminals is formed and inserted into and connected between the power supply and the load. In a power interruption device that cuts off the supply, a copper spacer 11 laminated with a copper plate or a plurality of thin plates having a suitable plate thickness is disposed between the parallel resistor 10, the power supply conductor 1, and the load side conductor 9; And an insulating tube 14 and an insulating washer 13 on the outer circumference of the body screw 15, and an insulating coating 12 such as a silicone tape on both ends of the parallel resistance 10.