KR20190080221A - Short circuit breaker with preventing malfunction and false notification by leakage current - Google Patents

Abstract

According to the present invention, an earth leakage circuit breaker for preventing false notification of a current leakage detects a leaked current when the leaked current is created to block a current to prevent an electric shock, and comprises: a current leakage detection unit (200) to detect a leaked current; a leaked current creation unit (120) to create a leaked current for a test to detect whether an abnormality exists in the current leakage detection unit (200); a communication unit (140) to communicate to allow a manager to perform remote diagnosis and self-diagnosis via communication; an input unit (100) to receive a signal instructing abnormality inspection of a current leakage detection circuit of an earth leakage circuit breaker from the manager to transfer the signal to the communication unit; a trip coil (40) to shut off a flow of a current by opening a circuit when a current leakage occurs; a control unit (110) connected to the current leakage detection unit (200), the leaked current creation unit (120), the communication unit (140), the input unit (100) and the trip coil (40) to control current leakage detection, current leakage detection test, detail inquiry, and detail transmission; and a power supply unit (150) connected to the current leakage detection unit (200), the leaked current creation unit (120), the communication unit (140), the input unit (100), the trip coil (40), and the control unit (110) to supply power.

Description

{Short circuit breaker with preventing malfunction and false notification by leakage current}

More particularly, the present invention relates to a device for use in an electrical leak detector for checking the presence or absence of an abnormality in the electrical leak check section, more particularly, (Hereinafter, referred to as a sub-operation) so that the main circuit is not tripped (hereinafter, referred to as a sub-operation) with respect to the leakage current.

In case of the existing earth leakage breaker, it is recommended that the user presses the test button once a month to check the leakage detector for abnormality. It is judged whether there is an abnormality in the earth leakage breaker short-circuit detection unit by operating when the test button is pressed.

The leakage detection circuit of the earth leakage breaker is operated by a leakage current of 30mA or more, but the leakage current of 15mA or less is prohibited. In other words, the leakage circuit breaker shall be deactivated for safety-related leakage currents of 15 mA or less. However, in case of the existing earth leakage breaker, when the administrator presses the test button to check for the abnormality of the earth leakage detector, a current of 30 mA or more flows, and at this time, only the fault of the earth leakage detector is checked whether or not the main circuit is tripped. That is, the leakage current of 15 mA or less, which should be negatively charged, may be regarded as a short circuit, and the main circuit may be tripped.

Thus, even if the leakage current is small, the leakage detecting circuit breaker detecting section operates and trips the main circuit, that is, generates a soap transmission signal, thereby causing inconveniences in use and further damaging the property due to power failure.

Therefore, in order to solve the above problem, it is necessary to perform not only the operation for the leakage current of 30 mA or more but also the non-operation for the sub-current of 15 mA or less.

Examples of prior art related thereto include a registered trademark 10-0564944 (entitled "Self-Test Leakage Circuit Breaker") and a Registered Patent No. 10-1410745 (entitled "Leakage Circuit Breaker and Control Method Thereof").

KR 10-0564944 B1 KR 10-1410745 B1

Accordingly, in order to solve the above problems, the present invention provides a circuit breaker that trips a main circuit for a leakage current of 30 mA or more, which is an operation current, This is because the sensitivity of the leakage check circuit of the earth leakage breaker is excessively sensitive to generate soap wire and trip the main circuit to cause a power failure, thereby reducing the life inconvenience and economic damage And to provide a soap dispenser preventive circuit breaker having a purpose. The objects of the present invention are not limited to the above-mentioned objects, and other objects not mentioned can be clearly understood from the following description.

In order to accomplish the above object, the present invention provides a leakage preventing circuit breaker for preventing leakage of electric power by detecting leakage current when a leakage current is generated, (200); A leakage current generating unit 120 for generating a leakage current for the test of detecting an abnormality in the leakage detecting unit 200; A communication unit 140 for communicating with the manager so as to perform remote diagnosis and self diagnosis through communication; An input unit (100) for receiving a signal instructing the manager to check for the presence or absence of an electric leakage detecting circuit of the earth leakage breaker and receiving the received signal; A trip coil (40) for opening a circuit to interrupt the flow of current when a short circuit occurs; The leakage detecting unit 200 is connected to the leakage current generating unit 120, the communication unit 140, the input unit 100 and the trip coil 40 to detect an electrical leak, an electrical leak detection test, A controllable control unit 110 of the control unit 110; And a power supply unit connected to the leakage detecting unit 200, the leakage current generating unit 120, the communication unit 140, the input unit 100, the trip coil 40, and the control unit 110, (150).

The present invention can check the presence or absence of an electric leak detecting circuit in an earth leakage breaker, so that it does not operate at a low current which should not be operated, thereby reducing unnecessary power failure, thereby reducing social inconvenience and economic loss, Effect.

In addition, it is possible to perform self-diagnosis through a manager's smartphone at a remote place, and to store the details through a memory, thereby enabling efficient management by checking through a smartphone or a PC.

1 is an embodiment of an anti-soap electrification preventing earth leakage breaker according to the present invention.
2 is a diagram showing an example of a leakage detection circuit of a conventional circuit breaker.
3 is a view showing an embodiment of an electric leakage detecting circuit of a soap-preventive earth leakage circuit breaker according to the present invention.
4 is a configuration diagram of a leakage preventing circuit malfunction prevention circuit according to the present invention.
5 is a circuit diagram of a leakage preventing circuit malfunction prevention circuit according to the present invention.

Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings, but the present invention is not limited by the scope of the present invention.

When an element is referred to as "including" an element throughout the specification, it is to be understood that the element may include other elements as well, without departing from the spirit or scope of the present invention. Also, the terms "part," " module, "and the like described in the specification mean units for processing at least one function or operation, which may be implemented in hardware or software or a combination of hardware and software .

Throughout the specification, when a part is referred to as being "connected" to another part, it includes not only "directly connected" but also "electrically connected" with another part in between .

Prior to the description, numerous aspects and embodiments are set forth in this specification, which are intended to be illustrative only and not limiting.

After reading this specification, it will be understood by those skilled in the art that other embodiments and examples are possible without departing from the scope of the present invention.

Before dealing with the details of the embodiments described below, some terms will be defined or clarified.

A trip is a series of operations that take current to the secondary by a classifier (CT) connected to the main circuit and instruct it to open the circuit breaker of the main circuit by detecting it by protective relay (overcurrent relay for short-circuit protection, etc.) Action.

Leakage current shall not be less than 1 / 2,000 of the maximum supply current for the leakage current between the wire and the ground of the insulated part of the low voltage cable and between the body and the conductor of the wire.

For example, when a single load is placed on the circuit breaker, the operating voltage is 220V / 0.001A = 0.22MΩ, which is higher than the reference value of 0.2MΩ. However, if the load is 10 pieces and the insulation of each device is 0.2MΩ, . At this time, in order to prevent the leakage current from exceeding 1 / 2,000 of the maximum supply current, 30/2000 = 15mA in the 30A branch circuit and this current is less than the operating current of the earth leakage breaker (operating at 30mA).

The preset predetermined values (220 V, 0.22 M ?, 0.2 M ?, 15 mA, 30 mA) described above are described in order to facilitate understanding of the present invention, which may vary depending on the setting of the operator, It is needless to say that the present invention is not limited thereto.

Soap transmission means that the leakage current is not less than 1 / 2,000 of the maximum supply current, but the earth leakage breaker operates or a short circuit occurs.

The ZCT sensor is a zero-phase-sequence current-transformer (zero-phase transformer) that is used to protect the ground of a relatively low transmission current. The ZCT sensor is a current transformer that magnetically balances a common self- To prevent malfunction of the ground relay.

2 is a view showing an example of an electric leakage detecting circuit of a conventional circuit breaker, and FIG. 3 is a circuit diagram of a leakage preventing circuit breaker according to the present invention, FIG. 4 is a configuration diagram of a leakage preventing circuit malfunction preventing circuit according to the present invention, and FIG. 5 is a circuit diagram of a leakage preventing circuit malfunction preventing circuit according to the present invention.

1 to 5, a description will be made of the anti-soap electrification prevention circuit breaker according to the present invention.

In order to accomplish the above object, the present invention provides a leakage preventing circuit breaker for preventing leakage of electric power by detecting leakage current when a leakage current is generated, (200); A leakage current generating unit 120 for generating a leakage current for the test of detecting an abnormality in the leakage detecting unit 200; A communication unit 140 for communicating with the manager so as to perform remote diagnosis and self diagnosis through communication; An input unit (100) for receiving a signal instructing the manager to check for the presence or absence of an electric leakage detecting circuit of the earth leakage breaker and receiving the received signal; A trip coil (40) for opening a circuit to interrupt the flow of current when a short circuit occurs; The leakage detecting unit 200 is connected to the leakage current generating unit 120, the communication unit 140, the input unit 100 and the trip coil 40 to detect an electrical leak, an electrical leak detection test, A controllable control unit 110 of the control unit 110; And a power supply unit connected to the leakage detecting unit 200, the leakage current generating unit 120, the communication unit 140, the input unit 100, the trip coil 40, and the control unit 110, (150).

The leakage detecting unit 200 may include a ZCT sensor 20 for detecting a leakage current and a detecting unit 30 for detecting a leakage current from the ZCT sensor 20. This allows ground protection.

The output unit 130 further includes an output unit 130 connected to the communication unit 140 and allowing the communication unit 140 to communicate the soap cable to the manager so that the output unit 130 is controlled by the control unit 110 , And can receive power from the power source unit.

In the case of the communication unit 140, an administrator may wirelessly communicate with an application for a smart phone installed in a smartphone so that the administrator can control the device through the smartphone. At this time, it is possible to check the details such as whether the current flow is normal or whether there is no leakage, remotely through the application, etc. For the wireless communication to be used, it is possible to use a Bluetooth communication or a 3G or LTE network So that they can communicate with each other.

The controller may further include a memory for storing the current flow, the leakage current in real time, and the details controlled through the controller 110 when the abnormality is checked.

The memory allows the administrator to check the history of the device through the smartphone or connect to the computer to check the details of the current flow and the occurrence of a short circuit in the event of a disaster such as a fire or an earthquake, To the administrator's PC or smartphone, but if it is difficult, it will be possible to confirm the event occurrence later like a black box.

Referring to FIGS. 2 and 3, the difference from the conventional technique will be described in more detail. In the case where the ZCT sensor, the detection unit, and the driving unit are provided between the load 2 and the power supply 1, In addition, it is connected to the leakage detecting unit 200, the leakage current generating unit 120, the communication unit 140, the input unit 100, and the trip coil 40 to control the leakage current detection, leakage detection test, And the leakage current generating unit 120 is provided for checking whether there is an abnormality in the sub-operation that should not operate.

In other words, it is possible to check whether there is an abnormality in whether or not the leakage current generating section 120 is operated at a portion that should not be operated by flowing a leakage current of 15 mA or less step by step with increasing current, , It is possible to remotely control the main circuit by normally tripping the main circuit, and to control the control remotely through the manager's smartphone or PC, and all the details are stored in the memory separately.

In the present invention, a malfunction prevention circuit for preventing a malfunction can be applied. 4, the leakage preventing circuit malfunction prevention circuit of the present invention, which is provided with a control circuit integrated device (IC) and an electrical leak detecting element (ZCT) connected to the control circuit integrated device (IC) A surge waveform shaping circuit (BD) connected to the electrical leak detecting element (ZCT); A voltage limit circuit (VL) connected to the output terminal of the surge waveform shaping circuit (BD); a current limiting circuit (IL) connected to an output terminal of the voltage limit circuit (VL); A trigger element SCR1 to which the gate of the current limiting circuit IL is connected; And a delay circuit TM connected to the trigger element SCR1.

The trigger element SCR1 is connected to the cathode of the trigger element SCR1 via the control circuit integrated element IC when the anode of the trigger element SCR1 is connected to the power supply (+) side VC of the control circuit integrated element IC, The trigger element SCR1 is activated when the electrical signal is inputted to the gate of the trigger element SCR1 and is connected to the control circuit integrated element IC) of the power supply is short-circuited.

In order to short-circuit the power source of the control circuit integrated circuit IC by the trigger element SCR1 at the time of surge input, the two input terminals of the surge waveform shaping circuit BD are connected to the input terminal Has a surge waveform shaping function connected to both ends (D, D ') of an electrical leak detecting element (ZCT) constituting an application circuit to ensure circuit operation irrespective of the polarity of the surge. And the polarity of the applied voltage is unified to the + or - output and output.

The induced voltage unified by the surge waveform shaping circuit (BD) is connected to the voltage limit circuit (VL) to determine whether it is an induced voltage due to surge, an operation noise or an induced voltage due to a short circuit.

The voltage limit circuit (VL) receives the voltage value output from the surge waveform shaping circuit (BD) and outputs the output voltage only when the surge voltage is an induced voltage. Since the voltage detected by the electrical leak detecting element (ZCT) has a value in the range of several V to several tens V, the voltage value input to the voltage limit circuit (VL) V, the voltage limit circuit (VL) generates an output voltage to discriminate the induced voltage by surge.

The output voltage of the voltage limit circuit (VL) is connected to the current limit circuit (IL). The current limiting circuit IL functions to protect the trigger element SCR1 by adjusting the amount of current flowing to the trigger element SCR1 when the output voltage of the voltage limit circuit VL is present, And it controls the voltage limit circuit (VL) to determine the surge current. The voltage limit circuit (VL) is used to cut off the low frequency voltage of 60 Hz or less.

The output of the current limiting circuit IL is connected to the gate of the trigger element SCR1 to activate the trigger element SCR1 when the surge current flows to short-circuit the power applied to the control circuit integrated device IC.

The power source applied to the control circuit integrated device IC is short-circuited by the trigger element SCR1 at the same time when the surge is introduced. At this time, the discharge of the resistor R and the capacitor C constituting the delay circuit TM . The charging of the capacitor C constituting the delay circuit TM occurs after the surge has disappeared and the RC delay time required for charging the capacitor is adjusted to supply power to the control circuit IC The time to be applied can be adjusted.

The delay circuit TM preferably includes a delay resistor on the power supply line of the control circuit integrated circuit IC and a power supply line of the control circuit integrated circuit IC and a power supply line of the control circuit integrated circuit IC -) < / RTI > line.

Accordingly, the delay circuit TM functions to automatically re-apply the power source short-circuited by the trigger element SCR1 after the surge has flowed, to the control circuit IC (IC) after a certain period of time.

It is a matter of course that even if the order in which the voltage limit circuit (VL) and the current limit circuit (IL) are connected is changed, the idea of the present invention can be implemented.

5 is a circuit diagram of a circuit for preventing a malfunction of a circuit breaker of the present invention. Circuit modules having the same functions as those of FIG. 4 are denoted by the same reference numerals, Were used.

The circuit for preventing a malfunction of the earth leakage breaker of the present invention comprises a surge waveform shaping circuit (BD ') a voltage limit circuit (VL' connected to the output terminal of the surge waveform shaping circuit (BD ' (Including a delay circuit TM 'connected to the trigger element SCR1' and the trigger element SCR1 'to which the current limiting circuit IL' and the gate are connected.

The surge waveform shaping circuit BD 'is characterized by being provided as a bridge of diodes D1 to D4 and is connected to both ends D and D' of the electrical leak detecting element ZCT.

The voltage limit circuit VL 'is characterized by using a limit element Z including a Zener diode, TVS, or a variable resistor.

The current limiting circuit IL 'comprises a capacitor C2 for limiting the low-frequency current provided between the output terminal of the voltage limit circuit VL' and the gate of the trigger element SCR1, and the trigger element SCR1 ' And a resistor R2 provided between the output terminal of the voltage limit circuit VL 'and the cathode of the trigger element SCR1' in order to prevent an excessive current from flowing through the voltage limit circuit VL '.

The trigger element SCR1 is connected to the gate of the current limiting circuit IL 'and the trigger element SCR1' is connected to the power source (+) side (VC) side of the control circuit integration IC And the cathode of the SCR1 'is connected to the power source (-) side SG of the control circuit integrated device IC.

The delay circuit TM 'is connected between the delay resistor R3 on the power supply (+) line of the control circuit integrated circuit IC to which the anode of the trigger element SCR1' is connected and the power supply (+) of the control circuit integrated circuit IC, And a delay capacitor C3 for connecting the line and the power source (-) line of the control circuit integrated device IC to which the cathode of the trigger element (SCR1 ') is connected.

More preferably, the delay resistor R3 and the delay capacitor C3 of the delay circuit TM 'are connected to a power supply resistor (not shown) existing in an application circuit on an application note provided by a manufacturer of the control circuit integrated device (IC) (R1) and a power smoothing capacitor (C1).

5, two input terminals of a bridge diode constituting a surge waveform shaping circuit (BD ') are connected to D and D', and surges for ensuring circuit operation irrespective of the polarity of the surge Has a waveform shaping function, and has a function of unifying the polarity of the voltage induced in the electrical leak detecting element (ZCT) to + or - output and outputting it.

The limit element Z constituting the voltage limit circuit VL 'generates a voltage across the resistor R2 constituting the current limiter circuit IL' when the output of the bridge diode BD 'is equal to or greater than a predetermined value, There is no difference in operation even when the position of the limit element Z is replaced with the capacitor C2 constituting the current limiting circuit IL '.

The capacitor C2 constituting the current limiter circuit IL 'operates in cooperation with the resistor R2 constituting the current limiter circuit IL' so as to operate as a current limiter circuit, and by the voltage induced across the resistor R2 When the charge current is supplied to the trigger element (SCR1 'trigger), the trigger element (SCR1' is activated).

The value of the trigger current or the surge current required for this is determined by the value of the limit element Z1 and the resistor R2 and the charge current of the capacitor C2 and the sensitivity of the gate current of the trigger element SCR1 ' do.

When the trigger element SCR1 'is activated, the power source of the integrated circuit (IC) connected to the anode is short-circuited so that the operation of the integrated circuit, which is the main control circuit, is stopped.

The trigger device can keep its operation state only when a constant current or more flows.

The delay resistor R3 and the delay capacitor C3 of the delay circuit TM 'are connected to the power supply resistor R1 existing in the application circuit on the application note provided by the manufacturer that manufactures the control circuit integrated device (IC) The power supply resistor R1 has a high resistance of 100 k [Omega] to about 160 k [Omega] on the application note of the integrated circuit manufacturer when constructing the delay circuit TM 'using the power smoothing capacitor C1 and the power smoothing capacitor C1, The capacitor C1 supplies a fine current through only one to several millivolts. The operating current of the above-described integrated circuit based on the manufacturer's specification of the trigger element SCR1 ' If the standard is applied, the trigger element (SCR1 ') can have the characteristic that its operation stops when the power smoothing capacitor (C1) is instantaneously discharged.

When the operation of the trigger element SCR1 'is stopped, the power smoothing capacitor C1 is again charged through the power supply resistor R1, and the integrated circuit is operated until the charge voltage reaches a voltage at which the integrated circuit can operate The ground fault circuit breaker is not fundamentally tripped until the surge current disappears.

Therefore, the power supply resistor R1 and the power smoothing capacitor C1 existing in the application circuit on the application note provided by the manufacturer that manufactures the control circuit integrated device (IC) and the above trigger device SCR1 ' Delay circuit (TM ').

While the present invention has been described with reference to exemplary embodiments, it is to be understood that the invention is not limited to the disclosed exemplary embodiments.

1: Single-phase 2-wire power
2: Single-phase 2-wire load
10: Test button
20: ZCT sensor
30:
40: Trip coil
100: Input unit
110:
120: Leakage current generating unit
130:
140:
200:

Claims (5)

1. An earth leakage breaker for detecting a leakage current when a leakage current is generated and for blocking an electric current to prevent an electric shock,
A leakage detecting unit 200 for detecting the leakage current;
A leakage current generating unit 120 for generating a leakage current for the test of detecting an abnormality in the leakage detecting unit 200;
A communication unit 140 for communicating with the manager so as to perform remote diagnosis and self diagnosis through communication;
An input unit (100) for receiving a signal instructing the manager to check for the presence or absence of an electric leakage detecting circuit of the earth leakage breaker and receiving the received signal;
A trip coil (40) for opening a circuit to interrupt the flow of current when a short circuit occurs;
The leakage detecting unit 200 is connected to the leakage current generating unit 120, the communication unit 140, the input unit 100 and the trip coil 40 to detect an electrical leak, an electrical leak detection test, A controllable control unit 110 of the control unit 110; And
A power supply unit connected to the leakage detecting unit 200, the leakage current generating unit 120, the communication unit 140, the input unit 100, the trip coil 40, and the control unit 110 150). ≪ / RTI >
The method according to claim 1,
The leakage detecting unit (200) includes a ZCT sensor (20) for detecting a leakage current; And
And a detector (30) for detecting a leakage current from the ZCT sensor (20).
The method according to claim 1,
And an output unit (130) connected to the communication unit (140) and causing the communication unit (140) to communicate soap information to the manager,
Wherein the output unit (130) is controlled by the control unit (110) and receives power from the power source unit.
The method according to claim 1,
Wherein the communication unit (140) is capable of wireless communication with an application for a smartphone installed in advance in the smartphone so that the manager can control the smartphone through the smartphone.
The method according to claim 1,
Further comprising a memory for storing the current flow and the leakage current in real time and for storing the details controlled by the controller (110) when the abnormality is checked,
Wherein the memory allows the manager to check the details through the smartphone or to connect to the computer to check details of the alarm.

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