KR20170006143A - Resistor installed in the neighborhood distribution circuit breaker designed for electrical distribution boxes - Google Patents

Abstract

The present invention relates to a resistor provided adjacent to a distribution circuit breaker provided in an electric distribution box. Especially when a short circuit or a short circuit occurs on the load side, a resistor provided adjacent to the circuit breaker load side reduces the current to less than the rated breaking current of the circuit breaker To a resistor provided adjacent to a distribution circuit breaker provided in an electric distribution box capable of protecting the circuit breaker by a tripping operation so that the movable contact in the circuit breaker is quickly separated from the fixed contact.
In order to realize this, when a short-circuit current is generated in the load-side wire portion 50 adjacent to the one side (30) on the load side of the distribution breaker provided with the electric distribution box, the rated breaking current And a resistor (40) for protecting the distribution circuit breaker (30) so as to allow the distribution circuit breaker (30) to flow.

Description

BACKGROUND OF THE INVENTION Field of the Invention [0001] The present invention relates to resistors installed in a distribution circuit breaker provided in an electric distribution box,

The present invention relates to a resistor provided adjacent to a distribution circuit breaker provided in an electric distribution box. Especially when a short circuit or a short circuit occurs on the load side, a resistor provided adjacent to the circuit breaker load side reduces the current to less than the rated breaking current of the circuit breaker To a resistor provided adjacent to a distribution circuit breaker provided in an electric distribution box capable of protecting the circuit breaker by a tripping operation so that the movable contact in the circuit breaker is quickly separated from the fixed contact.

As is well known, the circuit breaker is designed to prevent a possible fault current (short circuit, large current due to ground fault, etc.) It is an electric protective device installed between the power source and the load device to protect the breaker, fire and electric wire.

Such a circuit breaker is capable of performing a trip operation such that the movable contact can be quickly disconnected from the fixed contact when the fault current occurs, and the fixed contact and the movable contact so as to connect and disconnect between the power source side and the load.

Particularly, as an example of the prior art for protecting the breaker when an overcurrent occurs in the load side or a short circuit occurs, the circuit breaker includes a pair of fixed contacts provided with a fixed contact, a pair of movable contacts A movable contact having a contact and capable of interrupting the fixed contact, a switch for operating when an overcurrent flows in the fixed contact, a crossbar for disconnecting the movable contact from the fixed contact during operation of the switch, one end being coupled to the crossbar And the other end is provided in the vicinity of both ends of the movable contact and a pressing spring which is engaged with the substantially central portion of the movable contact and urges the movable contact in the direction of the fixed contact, And a small room.

When an overcurrent occurs or a short circuit occurs in the circuit breaker configured as described above, the overcurrent detecting unit operates the opening / closing mechanism and the crossbar separates the movable contact from the fixed contact, and the arc generated by the overcurrent is small The circuit breaker is designed to operate normally so that the circuit breaker can be protected from the overcurrent.

However, when the circuit breaker is used in an electric distribution box, if the short circuit of the load side wire or the short circuit of the ground due to the short circuit of the load is short, the resistance value of the electric wire becomes less than 0.088? The fixed contact and the movable contact are welded and exploded, and a fire due to the overheating of the power line and the load side of the electric line connected to the home in the transformer of the mains pole occurs.

Specifically, if the rated breaking current of the circuit breaker is 2.5KA and the supply side voltage of the breaker is 220V, the resistance value of the wire becomes less than 0.088Ω when the load side wire is short-circuited in the single-phase state with the rated current of 20A or less. The current value is a short-circuit current of 2.5KA or more.

Therefore, the short-circuit current flows more than 2.5KA of the rated breaking current of the breaker, so that the movable contact and the fixed contact of the breaker are welded and exploded.

As another prior art, as disclosed in the Utility Model Registration No. 20-0452900, a cover for covering an enclosure, a mechanism part provided inside the enclosure for performing an interruption operation when an abnormal current is generated, And a trip button disposed adjacent to the trip bar and contacting the trip bar by an external force to rotate the trip bar, wherein the trip button is integrally formed with the cover, and the trip button And a part of the outer peripheral portion is separated from the cover.

According to the wiring breaker configured as described above, when a separate component for applying elasticity to the trip button is removed and the external force is removed from the trip button by the elasticity of the trip button itself, the trip button can be separated from the trip bar, It is possible to reduce the number and facilitate manufacture.

However, in the above structure, there is a limit that the overcurrent can not be blocked by the structure of the trip bar that performs the shut-off operation of the mechanism for performing the shut-off operation when the abnormal current is generated.

SUMMARY OF THE INVENTION Accordingly, the present invention has been made in order to solve the above-mentioned problems, and it is an object of the present invention to provide a method and apparatus for measuring a current flowing through a conductor, the magnitude of which is proportional to a voltage applied to both ends of the conductor, If a short-circuit current is generated by a short-circuit on the load side or a short-circuit on the load side, the resistor provided on the side of the load side of the breaker for load distribution is inversely proportional to the flow rate of the current to less than the rated breaking current of the distribution circuit breaker, It is possible to perform a trip operation for quickly disconnecting the contact from the fixed contact, thereby protecting the distribution circuit breaker.

It is a further object of the present invention to prevent electrical fire by tripping the breaker for distribution by a resistor, to easily identify a short-circuit point, and to quickly repair it, thereby minimizing the damage range of the power failure.

In order to achieve the above object, when a short-circuit current is generated in a load-side wire section (50) adjacent to one phase (30) of a load side breaker provided with an electric distribution box, And a resistor (40) for allowing the distribution circuit breaker (30) to be protected so as to be allowed to flow below the cutoff current.

And the resistor (40) is achieved by providing a resistor having a resistance value of 0.047? Or more so that the rated breaking current of the distributing circuit breaker (30) matches the rated current of 20 A or less of 5KA.

The resistor (40) is achieved by providing a resistor having a resistance value of 0.09? Or more so that the rated breaking current of the distributing circuit breaker (30) is equal to or less than 2.5KA rated current of 20A.

As described above, according to the present invention, when a short-circuit current is generated due to a short circuit or a ground short-circuit at the load-side wire portion of the breaker, the current is reduced or restricted below the rated breaking current of the breaker by the resistor attached to the one- And the movable contact is not welded and the movable contact is quickly disconnected from the fixed contact, so that the breaker can be protected, the fire can be prevented, the short-circuit point can be confirmed, And the range of power failure can be minimized.

1 is a block diagram of a breaker of an electric distribution box of a building of the present invention.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be described in detail with reference to the accompanying drawings.

1 is a block diagram of an electric distribution box according to an embodiment of the present invention. Referring to FIG. 1, the electric distribution box includes a power supply unit 10 for supplying power of 220 V in a single- (30) including a power source side (30-1) to which electric power is supplied from the parking terminal unit (20) and a load side (30-2) A resistor 40 provided adjacent to the first side 30-2 of the load side and a load side wire portion 50 coupled with the resistor 40 and electric wires connected to a lamp and an electric heater in the room.

When a short-circuit current is generated in the load-side wire portion 50 by short-circuiting the wire or short-circuiting the ground, the resistor 40 is provided with a resistance value corresponding to the rated breaking current of the branching breaker 30, For example, if the rated breaking current is 2.5KA, a resistor with a resistance value of 0.090Ω or more should be provided.

That is, if the rated breaking current is 2.5KA and the power supply side voltage is 220V and the rated current is 20A or less, if the load is short-circuited to the load and short-circuited to ground, the resistance value of the wire is 0.088Ω or less. If the resistance value of the resistor 40 is set to 0.090? Or more, the short-circuit current can be lowered to 2.4KA or less.

In another embodiment, when the rated breaking current is 5KA and the power supply side voltage is 220V and the rated current is 20A or less, the resistance value of the electric wire is 0.044? , If the resistance value of the resistor 40 is set to 0.047? Or more, the short circuit current can be lowered to 4.6 KA or less. While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed exemplary embodiments.

In addition, those skilled in the art will appreciate that many modifications and variations of the present invention are possible without departing from the spirit and scope of the appended claims.

Accordingly, all such appropriate modifications and changes, and equivalents thereof, should be regarded as within the scope of the present invention.

10: power supply unit 20: parking short-term
30: Breaker for distribution 30-1: Power source side
30-2: load side 40: resistor
50: Load side wire section

Claims (3)

If a short-circuit current is generated in the load-side wire portion 50 adjacent to the one-phase-side 30 of the load-side breaker provided with the electric distribution box or short-circuited to the ground, the current can flow below the rated breaking current of the breaker 30 for distribution And a resistor (40) for protecting the distribution circuit breaker (30). The method according to claim 1,
Wherein the resistor (40) is provided with a resistor having a resistance value of 0.047? Or more so that the rated breaking current of the distributing circuit breaker (30) matches the rated current of 20A or less of 5KA. The method according to claim 1,
Wherein the resistor (40) is provided with a resistor having a resistance value of 0.09? Or more so that the rated breaking current of the distributing circuit breaker (30) is equal to or less than the rated current of 20KA of 2.5KA. resistor

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