KR102382153B1 - Power Cut-off Unit using Magnetic Contactor at the Electric Trouble comprising Arc - Google Patents

Abstract

The present invention relates to a power cut-off unit provided to prevent an electrical abnormality between a power supply for supplying power and a load. The power cut-off unit includes: a power cut-off part provided to cut off the power supplied from the power source; and a voltage determination part coupled to the input side of the load side to determine whether the drop in voltage supplied from the power supply side is less than or equal to the set voltage, wherein, as a result of the determination of the voltage determination unit, when the voltage is less than or equal to the set voltage, the power of the power cutoff part is cut off. Accordingly, the present invention provides the power cut-off unit using an electromagnetic contactor in the event of an abnormality including an arc, such that it stably responds to abnormalities including arcing in power supply lines, and only analog elements are used so that actions/operations are performed without errors, small number of parts are required, and economic costs are lowered.

Description

{Power Cut-off Unit using Magnetic Contactor at the Electric Trouble comprising Arc}

The present invention relates to a power cut-off unit using a magnetic contactor when an abnormality occurs, and more specifically, by detecting the voltage between the power supply side and the load side below a set voltage, the electromagnetic contactor can be used to detect the occurrence of various types of line abnormalities including arcs. It relates to the power cut-off unit used.

There are various kinds of indispensable elements to lead our lives and operate industrial facilities. Among these indispensable elements, electricity for supplying electric power to various electronic devices and facilities is included. Such electricity provides convenience and at the same time causes accidents.

These electrical accidents are: First, overheating or fire due to using current exceeding the load capacity (overload phenomenon), second, current flowing through a path other than the conducting wire (electrical leakage phenomenon), and third, the conductors are short-circuited. It can be divided into instantaneous overheating phenomenon (short circuit phenomenon), fourth, sparking phenomenon due to poor contact (arc phenomenon), and fifth, overheating phenomenon due to increased resistance in a specific part (resistance increase phenomenon).

Here, the arc occurs at the instant when the contact surfaces of the conductors separate. A minute air insulation layer is formed at the moment when a conductor is attached and then dropped, but the distance is too close, the insulation is momentarily broken and a discharge occurs. In the case of a series arc, an arc is generated as much as the current amount of the load, and in the case of a parallel arc, the amount of current reaches several KA due to a spark that springs out at the moment of a short circuit. In the case of a parallel arc, an earth leakage breaker usually operates to cut off the arc.

And it is a carbonization phenomenon due to an increase in resistance. Carbonization, like overload, generates heat in the conductor, but with a big difference. That is, in the carbonization phenomenon, as resistance increases in a specific part, heat is generated only in that part. For example, if the contact area is very small due to poor connection between the wire and the terminal block, the resistance of the part increases and heat is generated.

Circuit breakers, earth leakage breaker, etc. are used as safety devices to protect against accidents such as heat and fire caused by electricity.

Earth leakage breaker can protect and prevent from fire and overheating caused by leakage, overload, and short circuit, and wiring breaker can protect and prevent from overload, fire, and overheating due to short circuit.

However, according to the data, 70~80% of the causes of electric fires are due to arcs, 3~4% are due to short circuits, and the rest include increased contact resistance.

On the other hand, recently, an arc breaker has been designed and used to prevent overheating, fire, etc. by blocking the arc phenomenon that accounts for most of the causes of fires described above. However, such an arc breaker has a complicated system and structure because it must be controlled using not only analog elements but also digital elements including CPUs to detect and determine the changed irregular waveform or distortion of current or voltage, etc. There is a problem that the number of parts is large and the economic cost is high.

Accordingly, it is desirable to have a power cut-off unit capable of stably preventing the occurrence of an electrical abnormality including an arc more effectively, and having a small number of parts and a low economic cost.

[references]

Registered Patent Publication No. 10-1741693 (2017.06.15. Announcement)

Registered Patent Publication No. 10-1454203 (2014.11.04. Announcement)

An object of the present invention is to provide a power cut-off unit using a magnetic contactor when an abnormality including an arc that can reliably respond to the occurrence of an abnormality including an arc phenomenon in a power supply line.

In addition, another object of the present invention is to provide a power cut-off unit using an electromagnetic contactor when an abnormality including an arc that can operate/operate without error because only analog elements are used.

In addition, another object of the present invention is to provide a power cut-off unit using an electromagnetic contactor when an abnormality including an arc having a small number of parts and low economic cost occurs.

In addition, another object of the present invention is to provide a power cut-off unit using an electromagnetic contactor when an abnormality occurs including an arc capable of filtering abnormal occurrences such as an instantaneous voltage drop or instantaneous blackout.

In addition, another object of the present invention is to provide a power cut-off unit using a magnetic contactor when an abnormality including an arc that can be installed on the power supply side or the load side and can be installed on the existing power supply side and the load side can also increase the application range. .

In addition, another object of the present invention is that when the power is cut off by the power breaker, it can be easily checked with a lamp, and when an abnormality including an arc occurs, the power source using the magnetic contactor can simply and conveniently check the electrical abnormality point. to provide a blocking unit.

An object of the present invention is to provide a power cutoff unit provided to prevent an electrical abnormality between a power supply side and a load side for supplying power, comprising: a power cutoff unit provided to cut off power supplied from the power supply side; and a voltage determining unit coupled to the input side of the load to determine whether the drop of the voltage supplied from the power supply is less than or equal to a set voltage; It is achieved by the power cut-off unit, characterized in that.

In addition, it is preferable that the voltage determination unit includes a solid state relay (SSR), which is an electronic relay that operates when it is determined whether the voltage is equal to or less than the set voltage.

In addition, the voltage determining unit may further include a resistor capable of reducing the voltage supplied to the SSR.

In addition, it is preferable that the resistance is variable.

In addition, the power cutoff unit preferably includes a magnetic contactor.

In addition, it is preferable to further include a rectifying unit for supplying the accumulated power to the power cutoff unit when the voltage equal to or less than the set voltage determined by the voltage determining unit is within a set time.

In addition, the rectifying unit power cut-off unit, characterized in that it comprises a diode bridge (diode bridge) and a capacitor (capacitor, condenser).

According to the present invention, it is possible to provide a power cut-off unit using a magnetic contactor when an abnormality including an arc that can reliably respond to the occurrence of an abnormality including an arc phenomenon in a power supply line.

In addition, since only analog elements are used, it is possible to provide a power cut-off unit using a magnetic contactor when an abnormality including an arc that can operate/operate without error occurs.

In addition, it is possible to provide a power cut-off unit using an electromagnetic contactor when an abnormality including an arc occurs with a small number of parts and an inexpensive economical cost.

In addition, it is possible to provide a power cut-off unit using a magnetic contactor when an abnormality including an arc that can filter the occurrence of abnormalities such as instantaneous voltage drop or instantaneous power failure.

In addition, since it can be installed on the power supply side or the load side, and can be installed on the existing power supply side and the load side, it is possible to provide a power cut-off unit using a magnetic contactor when an abnormality including an arc that can increase the application range occurs.

In addition, when the power is cut off by the power breaker, it can be easily checked with a lamp, and when an abnormality including an arc occurs that can simply and conveniently check the electrical abnormality point, it is possible to provide a power cutoff unit using a magnetic contactor.

1 is a circuit diagram of a power cut-off unit according to an embodiment of the present invention;
Figure 2 is a flow chart of Figure 1;
Figure 3a is an explanatory diagram for explaining the voltage determination unit,
Figure 3b is a circuit diagram for explaining an embodiment of the rectifier;
4A and 4B are circuit diagrams for explaining the operation process of the power cut-off unit;
5A to 5D are graphs schematically illustrating an example of a voltage change waveform in a capacitor in a normal state and when an electrical abnormality occurs.

When an abnormality including an arc occurs according to an embodiment of the present invention, a power cut-off unit (100, hereinafter referred to as a "power cut-off unit") using an electromagnetic contactor will be described in detail with reference to FIGS. 1 to 5D as follows. same.

1 is a circuit diagram of a power cut-off unit according to an embodiment of the present invention, FIG. 2 is a flowchart of the power cut-off unit, FIG. 3a is an explanatory diagram for explaining a voltage determination unit, and FIG. 3b is an embodiment of a rectifier It is a circuit diagram for explanation, and FIGS. 4A and 4B are circuit diagrams for explaining the operation process of the power cut-off unit, and FIGS. 5A to 5D schematically illustrate an example of a voltage change waveform in a capacitor when an electrical abnormality occurs and in a normal state It is a graph showing

Prior to describing the present invention in more detail, the present invention is to be described in detail in the text of the present invention can be made various changes and can have various forms, implementation (態樣, aspect) (or embodiments) in the text . However, this is not intended to limit the present invention to the specific disclosed form, it should be understood to include all modifications, equivalents and substitutes included in the spirit and scope of the present invention.

In each drawing, the same reference sign, particularly the number of the tens and one digit, or the reference numerals having the same tens, one, and alphabet, indicates a member having the same or similar function, and, unless otherwise specified, each The member indicated by the reference sign may be regarded as a member conforming to these standards.

In addition, in each drawing, components are expressed in exaggeratedly large (or thick), small (or thin) or simplified in size or thickness in consideration of convenience of understanding, but the protection scope of the present invention is limited by this. it shouldn't be

The terminology used herein is only used to describe a specific embodiment (aspect, aspect, aspect) (or embodiment), and is not intended to limit the present invention. The singular expression includes the plural expression unless the context clearly dictates otherwise. In the present application, terms such as comprises or consists of are intended to designate that the features, numbers, steps, operations, components, parts, or combinations thereof described in the specification exist, but one or more other features It is to be understood that it does not preclude the possibility of the presence or addition of numbers, steps, operations, components, parts, or combinations thereof.

Unless defined otherwise, all terms used herein, including technical and scientific terms, have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. Terms such as those defined in commonly used dictionaries should be interpreted as having a meaning consistent with the meaning in the context of the related art, and should not be interpreted in an ideal or excessively formal meaning unless explicitly defined in the present application. does not

The power cut-off unit 100 according to the present invention is provided to prevent an electrical abnormality between the power supply side and the load side for supplying power, and a power cut-off unit 130 provided to cut off the power supplied from the power supply side; and a voltage determination unit 110 coupled to the input side of the load to determine whether the drop of the voltage supplied from the power source is equal to or less than the set voltage; It is preferable that the power of the power cutoff unit 130 is cut off.

It is preferable that the power cut-off unit 100 further includes a rectifying unit 150 .

And, it is preferable that the power cut-off unit 100 further includes a conventionally known earth leakage breaker 170 . Here, it is preferable that the earth leakage breaker 170 is blocked by known functions such as earth leakage, overload, ground fault, and short circuit.

The present invention is a power cutoff unit 130 coupled to the power supply side by detecting a low voltage below the set voltage, which is a set voltage due to an increase in contact resistance and arc generation that the earth leakage breaker cannot detect in addition to the existing role of the earth leakage breaker while being used with the earth leakage breaker (130) It is possible to remove the cause of fire due to heat or prevent the occurrence of fire.

Here, the voltage determination unit 110, the power cutoff unit 130, and the rectifier 150, which are the power cutoff units 100 except for the earth leakage breaker 170, are manufactured as one module, for example, on the load side including the outlet. They may be combined or located in a switchboard if necessary. According to this configuration, the power cut-off unit 100 made of a single module (including an earth leakage breaker or a lamp if necessary) can be installed on the load side such as an existing switchboard or an outlet, so that its application range can be widened.

The power cutoff unit 130 includes a magnetic contactor (MC). The magnetic contactor is used as a switch when controlling a large current.

In this patent, the magnetic contactor, which is the power cut-off unit 130, uses a low voltage, which is a set voltage in connection with the SSR (Solid State Relay), which is a voltage determination unit 110 that detects a voltage drop due to arc, disconnection, and resistance increase. If it is detected by (110), the power is cut off.

Hereinafter, the power cutoff unit 130 also refers to an electromagnetic contactor in a narrow sense, and thus the same reference numerals are used.

The voltage determination unit 110 according to the present invention uses only a minimum of components to simplify the structure as shown in FIG. 3A , and preferably includes a resistor 113 and an SSR (115, Solid State Relay). The power of the voltage determining unit 110 is connected to the input side of the load side, so that it is possible to detect or determine an electrical abnormality between the line between the power supply side and the load side. And the output terminal of the SSR 115 is respectively connected to the power supply side and the Normal Open side of the magnetic contactor 130 (refer to "MC NO" in FIG. 1).

As an example of determining the voltage in the voltage determination unit 110, if the voltage supplied from the power supply side is 220 volts, it can be determined that the voltage above 207 volts is a normal voltage, and the voltage set in the voltage determination unit 110 is adjusted by the resistor 113. It can be set to a set voltage of 207 volts or less, and if it is less than this set voltage, the SSR(115) judges that an electrical abnormality (short circuit, arc, low voltage, contact resistance increase, instantaneous power failure, instantaneous voltage drop, etc.) has occurred on the power side and the load side. Thus, the SSR 115 operates.

That is, the resistor 113 variable as needed from the load-side power supply is coupled, and the input side of the SSR 115 is coupled to the rear end thereof. With this structure, a normal voltage (eg, 220 Volt) and a voltage regulated by a resistor are supplied to the input side of the SSR 115 .

In other words, the input voltage range of the SSR 115 is generally determined. For example, if the input range is 75Vac to 250Vac, the voltage may be dropped to be close to 75Vac through adjustment of the resistor 113 and supplied to the input side of the SSR 115 . Accordingly, when a voltage of 75Vac or less is detected in the SSR 115, the SSR 115 operates and transmits a signal (refer to "SSR" in FIG. In this case, the power supply and load lines can be cut off.

On the other hand, the rectifier 150 determines that the SSR 115 is an electrical abnormality, and when the SSR 115 operates, a momentary power failure, a momentary voltage drop, etc. occurs due to a fault on the line that occurs very instantaneously among the electrical abnormalities. Although the power supplied from the power supply side is cut off by the operation of 115, it functions to compensate the voltage accumulated in a short time to the power cutoff unit 130 side.

The rectifier 150 preferably includes a diode bridge 153 and a capacitor, as shown in FIG. 3B .

An electrical abnormality is accompanied by a voltage drop, but for example, if the instantaneous power failure or instantaneous voltage drop also falls below the set voltage, the SSR 115 operates. In this case, the SSR 115 Even if power is not supplied from the power supply side due to this operation, the voltage accumulated in the capacitor 155 of the rectifier 150 can be supplied to the power cut-off unit 130 according to the capacity of the capacitor 155, so the power cut-off unit 130 Power is supplied so that the power of the power cutoff unit 130 is not cut off.

Accordingly, even when the rectifier 150 determines that the electrical abnormality is less than or equal to the set voltage in the SSR 115 , the accumulated voltage may be compensated by the power cut-off unit 130 in the case of a momentary power failure or an instantaneous voltage drop.

Here, the circuit diagram and conceptual diagram of FIG. 1 will be schematically described as follows.

First, in the main circuit diagram, the earth leakage breaker 170 is coupled to the power supply side, and then the power breaker 130 including the electromagnetic contactor is coupled to the line and the voltage judgment part including the resistor 113 and the SSR 115 on the input side of the load side. (110) is coupled.

And from the auxiliary circuit, "PB1" is a manual off switch that can cut off the line, and "SSR" is a contact coupled with the secondary side of the SSR (115) (SSR operates - when it is determined that it is below the set voltage - falls off , it is attached when the SSR does not work, and is off when electricity is not applied). "MC PB2" (hereinafter referred to as "PB2") is an ON switch that operates the magnetic contactor 130, and when not pressed, the power cut-off unit does not operate, and "MC NO" is the magnetic contactor 130's a contact point, "MC NC" represents the b contact point of the magnetic contactor 130, "L" is the lamp 140 (off in normal circuit flow), and "rectification unit" refers to the rectifying unit 150 described above. do it by doing In addition, although only the lamp 140 is illustrated in this circuit, it is of course that the lamp may be flickered or an alarm may be generated contrary to this circuit in order to inform an abnormality when the magnetic contactor 130 is blocked.

Although not shown when the flow is changed from the auxiliary circuit to the rectifying unit 150, a timer capable of setting a set time and a selection circuit including a relay operating for a set period (refer to "S140" in FIG. 2) may be further included. can

That is, a typical operation process according to the circuit shown in FIG. 1 will be described as follows.

First, when power is supplied, “PB1” is turned on, and “PB2” is operated while “MC NO” is turned on. And "SSR", "MC NO" and "PB2" mean a conventional self-holding circuit.

According to this configuration, if the voltage from the power supply side is supplied to the load side and no electrical abnormality occurs, the circuit flows through PB1 - SSR - MC ON or PB1 - PB2 to MC, so that the flow is not interrupted. And, the lamp 140 is turned on.

The operation process of the power cut-off unit 100 according to the configuration of the present invention will be described in detail with reference to the drawings as follows.

Here, a case in which 220 volt power is supplied and single-phase will be described.

First, when a normal voltage is supplied, the power cut-off unit 100 operates normally without the voltage determining unit 110 operating as described above. That is, for example, from 220 volt voltage to 207 volt, which is a legally permitted or valid voltage, it is determined as a normal voltage, and the abnormal low voltage is the input line of the SSR 115 from the load side using the variable resistor 113 as described above. By controlling the flow in the resistance, it is possible to adjust the set voltage, which is the voltage reference determined by the SSR (115). For example, it is assumed that 200Vac is set as the set voltage for convenience of explanation.

Then, if the first electrical abnormal short circuit, arc, low voltage, or contact resistance increase occurs between the power supply side and the load side, and the second electrical abnormality momentary power failure or an electrical abnormality including instantaneous voltage drop occurs (130) is blocked or not blocked.

First, it is a state in which power is supplied from the power cutoff unit 130 (S110). Press PB2 to connect (electrically connect) the circuit, and PB1 is connected.

In this case, PB1 connection, SSR connection, PB2 connection, and MC NO are connected on the circuit, so that the power cutoff unit 130 is not cut off, power is supplied from the power supply side to the load side, MC NC is opened, and the lamp 140 is turned on.

Next, first, when an electrical abnormal arc occurs, when the voltage on the load side is input to the SSR 115 through the resistor 113, it is determined whether the voltage input from the SSR 115 to the SSR 115 is less than or equal to the set voltage ( S120).

In the SSR 115, when it is determined whether the voltage input from the load is the set voltage (S120) and is less than the set voltage (S123), the SSR 115 is activated to open (break) the "SSR" contact.

Due to this operation, the circuit flowing to the MC is cut, so that the power cut-off unit 130 maintains the cut-off state (S150), and the lamp 150 is turned on.

When it is determined (S120) whether the voltage input from the load side is the set voltage in the SSR (115) and it is not determined to be less than the set voltage (S125), the SSR (115) does not operate and the power of the power cut-off unit 130 is continuously is supplied to the load side.

On the other hand, when a momentary power failure occurs due to the second electrical abnormality, it is the same until the SSR 115 operates through the set voltage determination step (S120) described above (S130), but unlike the first electrical abnormality, the generation time of the low voltage is short A process of determining whether it is within the set time (S140) is performed.

The reason for the step S140 is to determine whether the low voltage is instantaneous, and to determine that the instantaneous low voltage is not an electrical abnormality or failure.

That is, if it is determined in step S140 that the voltage below the set voltage continues for more than the set time (S143), the power of the power cutoff unit 130 is cut off. In the case of an electrical abnormal arc, an irregular low voltage may be generated in some cases, but in this case, the voltage from the capacitor 155 to the MC may be instantaneously supplemented, but since the charging time is shorter than the discharging time (for example, , the capacitor continues to generate a low voltage for more than the time constant), the power cutoff unit 130 may be cut off (see FIGS. 5C and 5D ).

Otherwise, if it is determined in step S140 that the voltage below the set voltage does not last for more than the set time (S145), the power accumulated in the rectifier 150 is supplied to the power cutoff unit 130 side, and the power cutoff unit 130 is not cut off. power is continuously supplied to the load side.

Here, the determination of whether the set voltage of step S140 continues for the set time (refer to FIG. 5b ) may include a separate timer (not shown), but it is preferable to apply the unique time constant of the capacitor 155 as it is (see FIG. 5b ). 5a to 5d c).

Accordingly, according to the present invention, it is possible to provide a power cut-off unit using a magnetic contactor when an abnormality including an arc that can stably respond to the occurrence of an abnormality including an arc phenomenon in the power supply line.

In addition, since only analog elements are used, it is possible to provide a power cut-off unit using a magnetic contactor when an abnormality including an arc that can operate/operate without error occurs.

In addition, it is possible to provide a power cut-off unit using an electromagnetic contactor when an abnormality including an arc occurs with a small number of parts and an inexpensive economical cost.

In addition, it is possible to provide a power cut-off unit using a magnetic contactor when an abnormality including an arc that can filter the occurrence of abnormalities such as instantaneous voltage drop or instantaneous power failure.

In addition, since it can be installed on the power supply side or the load side, and can be installed on the existing power supply side and the load side, it is possible to provide a power cut-off unit using a magnetic contactor when an abnormality including an arc that can increase the application range occurs.

In addition, when the power is cut off by the power breaker, it can be easily checked with a lamp, and when an abnormality including an arc occurs that can simply and conveniently check the electrical abnormality point, it is possible to provide a power cutoff unit using a magnetic contactor.

Here, although an embodiment of the present invention has been illustrated and described, those of ordinary skill in the art to which the present invention pertains can understand that this embodiment can be modified without departing from the principle or spirit of the present invention. will be. The scope of the invention will be defined by the appended claims and their equivalents.

100: power cut-off unit 110: voltage determination unit
113: resistance 115: SSR
130: power cut-off unit 140: lamp
150: rectifier 153: diode bridge
155: capacitor (capacitor) 170: earth leakage breaker

Claims (9)

In the power cutoff unit provided to prevent an electrical abnormality between the power supply side and the load side for supplying power,
a power cutoff unit provided to cut off the power supplied from the power source;
A voltage determining unit coupled to the input of the load side to determine whether the voltage that is supplied from the power source and dropped is less than or equal to a set voltage;
As a result of the determination of the voltage judging unit, if the lowered voltage is equal to or less than the set voltage, the power of the power breaker is cut off,
The voltage determination unit includes a solid state relay (SSR), which is an electronic relay that determines whether the voltage is below the set voltage and is operable according to the result,
When maintaining the voltage below the set voltage determined by the voltage determining unit is longer than the set time, the power supplied to the power cutoff unit is cut off so that power is not supplied to the load side,
When it is less than a set time to maintain the voltage below the set voltage determined by the voltage determining unit, the accumulated power is supplied to the power cut-off unit, and the power of the power cut-off unit is not cut off, so that power is supplied to the load side. power cut-off unit. delete According to claim 1,
The voltage determining unit further comprises a resistor capable of variably reducing the voltage supplied to the SSR. delete 4. The method of claim 1 or 3,
The power cutoff unit power cutoff unit, characterized in that it comprises a magnetic contactor (Magnetic Contactor). According to claim 1,
Power cut-off unit, characterized in that it further comprises a rectifying unit for supplying the accumulated power to the power cut-off unit when maintaining the voltage less than the set voltage determined by the voltage determination unit is less than a set time. 7. The method of claim 6,
The rectifier is a power cut-off unit, characterized in that it comprises a diode bridge (diode bridge) and a capacitor (capacitor, condenser). According to claim 1,
Power cut-off unit, characterized in that it further comprises an earth leakage breaker on the power supply side. 4. The method of claim 3,
The set voltage is a power cut-off unit, characterized in that it includes a voltage passing through the resistor.

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