KR101932260B1 - Distribution Board with Leakage Current Sensing Device - Google Patents

Abstract

The present invention relates to a distribution board including a device to regularly monitor an electric breakdown by using a sensor and a controller, capable of preventing a user from having an electric shock by detecting static electricity, an arc, and over-grounding, which are generated in a frame and a panel of the distribution board. To achieve the purpose, according to the present invention, the distribution board including a device to regularly monitor an electric breakdown using a sensor and a controller includes: a leaked current detecting part detecting a leaked current while the device to regularly monitor an electric breakdown is installed inside the distribution board; a signal processing part processing a signal detected by the leaked current detecting part; a control part receiving the signal, which has been processed through the signal processing part, comparing the same to a preset reference value, and then controlling the operation of an alarm and a circuit breaker in accordance with the result of the comparison; and a display part receiving the signal from the control part and outputting a leaked current value and operational states of the alarm and the circuit breaker. The leaked current detecting part includes a static electricity sensor installed to detect static electricity generated from the panel of the distribution board.

Description

Technical Field [0001] The present invention relates to a distribution board with leakage current sensing device using a sensing sensor and a controller,

More particularly, the present invention relates to a switchboard having an insulation breakdown alarm device using a sensor and a controller, more particularly, to detect a leakage current in the switchboard in order to prevent a leakage current and an electric shock accident caused by an arc flash in the switchboard And a control panel configured to control the breaker or the alarm based on the sensed information, and an electrical switchboard having the insulation breakdown constantly sensing device using the controller.

Generally, the leakage current due to insulation breakdown of the switchboard can be detected by measuring the leakage current through the ground line of the inside of the switchboard or the line, measuring the current and voltage input from CT (Current Transformer) and PT (Potential Transformer) To measure the insulation resistance and the leakage current.

However, as described above, in order to measure the leakage current by connecting the ZCT, CT ammeter, etc. to the power line, the user must be very close to the power line, and electric shock accidents are frequently generated in this process.

Therefore, in recent years, a technology has been developed to detect leakage current in the switchboard and to prevent the accidental breakdown of the switchboard if necessary.

As described above, there is a switchboard having a leakage current measuring device and a leakage current measuring device of Japanese Patent No. 1567491 as a prior art of an electrical switchboard having a leakage current sensing device.

The switchgear having the leakage current measuring apparatus disclosed in the above patent document includes a leakage current detecting unit provided on the neutral point ground line on the secondary side of the switchgear transformer and detecting a leakage current; A first leakage current judging module for judging whether the leakage current value detected by the leakage current judging module exceeds a preset current threshold value; and a second leakage current judging module for judging whether the leakage current value exceeds the current threshold value And a second leakage current determination module for counting a duration of the leakage current exceeding the current threshold value and determining whether the leakage current exceeds a predetermined time threshold value, thereby generating a leakage current generation signal; A leakage alarm unit for receiving a leakage current generation signal from the central processing unit and displaying a warning sound, warning light or warning image; And a leakage information display unit for receiving and displaying the leakage current value and the leakage occurrence time value from the central processing unit, wherein the leakage current detection unit reduces a voltage value and a current value to be sensed and converts the voltage value and the current value into a low signal And the central processing unit converts the voltage value and the current value of the low signal inputted from the leakage current sensing unit into a waveform through a fast Fourier transform and sets the voltage value and the current value on the basis of the voltage waveform, And a phase angle calculation module for calculating a phase angle by obtaining a difference between the currents, and the leakage information display part displays the leakage current value in magnitude and phase angle.

However, since the leakage current measuring device of the above patent document is installed to the neutral point ground wire of the secondary side of the transformer and detects only the leakage current generated in the ground wire, it is possible to prevent electric shock and fire accidents due to static electricity, arc and over- .

Therefore, an insulation breakdown constantly detecting device (or a leakage current detecting device) capable of detecting an electrostatic discharge, an arc, and an overdrive which are generated in a panel and a frame of a switchboard, respectively, It is necessary to develop an electric distribution panel equipped with the above.

KR 10-1153840 B1 (May 31, 2012) KR 10-1209288 B1 (Nov. 30, 2012) KR 10-1567491 B1 (Mar. KR 10-1665952 B1 (October 10, 2016) KR 10-2017-0058246 A (May 27, 2017)

SUMMARY OF THE INVENTION Accordingly, the present invention has been made keeping in mind the above problems occurring in the conventional method for detecting leakage current caused by dielectric breakdown in an A / The present invention provides a switchboard having a detection sensor and a device for normally detecting an insulation breakdown by detecting an over-lock or the like to prevent an electric shock accident occurring during a process of checking or operating a panel by a user.

According to another aspect of the present invention, there is provided an electrical switchboard comprising the leakage current sensing device. The leakage current sensing device includes a leakage current detector for detecting a leakage current while being installed inside the switchboard. A signal processor for processing the signal detected by the leakage current detector; A control unit for receiving a signal processed by the signal processing unit, comparing the received signal with a predetermined reference value, and controlling the operation of the circuit breaker and the alarm according to a comparison result; And a display unit receiving a signal from the control unit and outputting an operation state and a leakage current value of the circuit breaker and the alarm, and the leakage current detection unit includes a static electricity sensing unit for sensing a voltage of the static electricity generated in the panel and the frame of the distribution board, And a sensor.

The present invention is characterized in that the leakage current detection unit detects a leakage current value of a panel and a frame of the switchboard, And a second leakage current sensor for detecting a leakage current value to the terminal ground of the switchboard.

Further, the present invention is characterized in that the signal processing unit comprises: a noise filter for removing noise included in the analog signal detected by the leakage current detecting unit; An amplifier for amplifying a noise-removed analog signal from the noise filter; And an A / D converter for converting the analog signal amplified by the amplifier into a digital signal.

In addition, the present invention is characterized in that the control unit comprises: an electrostatic voltage determination unit for determining an electrostatic voltage value from a signal transmitted from the signal processing unit; An over-lock current determination unit for determining an over-lock current value from a signal transmitted from the signal processing unit; A wireless communication unit for wirelessly connecting the control unit and the external device; A threshold comparator for comparing the electrostatic voltage value and the over-lock current value, which are respectively determined by the electrostatic voltage determination unit and the over-lock current determination unit, with a threshold preset by a user; And a breaker control unit for applying a cutoff control signal to the breaker according to a comparison result of the threshold comparison unit.

In the present invention, when the threshold value comparison unit reaches 70 to 95% of the threshold value or the static voltage value of the signal transmitted from the signal processing unit reaches the threshold value, the time or percentage And an alarm generation signal is provided to the alarm unit for each unit.

The switchboard having the leakage current sensing device according to the present invention detects the voltage of the static electricity and the current value leaking from the panel and the frame of the switchboard which are in direct contact with the user's body, And the operation of the alarm is prevented, thereby preventing an electric shock accident occurring in the process of the user checking and operating the panel of the switchboard.

In addition, when the leakage current value and the electrostatic voltage value are compared with a threshold value preset by the user and the voltage falls within a certain range, an alarm can be continuously generated and the user can be alerted in advance, thereby preventing electric shock accidents more effectively.

Brief Description of the Drawings Fig. 1 is a view showing an example of an electrical switchboard equipped with a sensing sensor and an apparatus for normally detecting an insulation breakdown using a controller according to the present invention. Fig.
BACKGROUND OF THE INVENTION Field of the Invention [0001]
3 is a block diagram showing an example of a leakage current detector according to the present invention.
4 is a view showing an example of an electrostatic sensor according to the present invention.
5 is a block diagram showing an example of a signal processing unit according to the present invention.
6 is a configuration diagram showing an example of a control unit according to the present invention;

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

The present invention detects a static electricity, an arc, and a ground fault occurring in a panel and a frame of an ASS panel and detects a failure of the insulation using a sensor and a controller to prevent an electric shock accident occurring in a process of checking or operating a panel 1, the present invention provides an electrical switchboard comprising a switchboard 1 having a predetermined size as shown in Fig. 1, an insulation breakdown constantly sensing device 2 installed on one side of the switchboard 1, The switchboard 1 is provided with a circuit breaker 1A for interrupting the supply of power from the outside and an alarm 1B for generating a warning sound for the user to recognize the danger.

2, the apparatus 2 includes a leakage current detector 10, a signal processor 20, a controller 30, and a display unit 40. Hereinafter, The configuration and operation of the device 2 will be described.

The leakage current detecting section 10 is provided on one side of the switchboard 1 to detect static electricity generated in the panel and frame of the switchboard 1 and to transmit the detected information to the signal processing section 20 to be.

3, the leakage current detecting unit 10 includes an electrostatic detecting sensor 11 installed to detect static electricity generated in the panel and frame of the switchboard 1, And a second leakage current detection sensor 13 for detecting a current value leaking to the terminal ground of the power distribution board 1. The first leakage current detection sensor 12 detects a current value of the first leakage current detection sensor 12,

The electrostatic sensor 11 includes a sensor body 11A having a predetermined size as shown in FIG. 4 and a sensor body 11A having a predetermined length, which is installed at one side of the sensor body 11A and detects a voltage of a static electricity A voltage sensing unit 11B and an arc detection unit 11B installed at a side of the sensor main body 11A and spaced apart from the voltage sensing unit 11B by a predetermined distance.

Here, the arc detecting unit 11B is constituted by an optical sensor for detecting whether or not the electric light generated in the panel is generated. Unlike the static electricity, the arc detecting unit 11B uncovers or breaks the wire, It is possible to detect an instantaneous light, and thereby, it is possible to quickly identify and take action against a dangerous situation such as a fire which may be caused by an arc.

According to the configuration of the electrostatic detecting sensor 11 as described above, the voltage of the static electricity generated in the panel and the frame of the switchboard 1 is sensed through the voltage sensing unit 11B and the static electricity sensed by the signal processing unit 20, And the information on whether or not all lights detected through the arc detecting unit 11B are generated is transmitted to the control unit 30, which will be described later.

The electrostatic detecting sensor 11 is configured to detect static electricity within a distance of 25 to 100 mm, and the user can set the measuring distance of the static electricity from a minimum of 25 mm to a unit of 10 mm by a controller 30 .

The leakage current values detected by the first and second leakage current sensors 12 and 13 at the panel, the frame and the terminal ground are respectively supplied to the overcurrent detection unit 20 of the control unit 30 via the signal processing unit 20, (32), and it is judged whether the blockage is locked.

The leakage current detector 10 further includes a vibration sensor 14 for detecting vibration such as an earthquake and the vibration signal sensed by the vibration sensor 14 is transmitted to the controller 30, The control unit 30 can quickly control the circuit breaker 1A in the event of vibration such as an earthquake to cut off the power applied to the switchboard 1 and as a result the device 30 installed inside the switchboard 1 A fire or the like which is caused by breakage due to irregular movement is prevented.

The signal processing unit 20 converts the analog signal transmitted from the leakage current detector 10 into a digital signal and provides the digital signal to the controller 30.

5, the signal processing unit 20 includes a noise filter 21 for removing noise included in an analog signal detected and transmitted by the leakage current detecting unit 10, An amplifier 22 for amplifying the removed analog signal, and an A / D converter 23 for converting the analog signal amplified by the amplifier 22 into a digital signal.

The signal processing unit 20 is widely used for converting an analog signal into a digital signal, removing noise included in the signal, and extracting a signal of a required band, so that a detailed description thereof will be omitted.

The control unit 30 receives the signal processed by the signal processing unit 20 and compares the processed signal with a predetermined reference value and controls the operation of the breaker 1A and the alarm unit 1B installed in the switchboard 1 according to the comparison result .

6, the control unit 30 includes an electrostatic voltage determination unit 31 for determining an electrostatic voltage value from a signal transmitted from the signal processing unit 20, A wireless communication unit 33 for wirelessly communicating the control unit 30 with an external device and a control unit 32 for controlling the electrostatic voltage determination unit 31 and the overcurrent A threshold comparator 34 for comparing the voltage value of the static electricity and the overcurrent current value respectively determined by the comparator 32 with a preset threshold value set by the user and a threshold value comparator 34 And a breaker control unit 35 for applying a cutoff control signal to the breaker control unit 35.

At this time, the wireless communication unit 33 is for monitoring the leakage current sensing apparatus 1 at a remote place or in real time from a user (or a manager) or for changing the setting contents. For this purpose, the wireless communication unit 33 may be a Wi- Bluetooth), and the like, among various types of known wireless communication devices.

When the electrostatic voltage value or the overcurrent current value of the signal transmitted from the signal processing unit 20 reaches 70 to 95% of the threshold value, the threshold value comparison unit 34 compares the time constant until the threshold value is reached And to provide an alarm generation signal to the alarm 1B per percentage unit.

At this time, if the detected electrostatic voltage value or the overcurrent current value reaches 70 to 95% of the threshold value, the alarm is set to be continuously generated in the unit of 1 to 5% until the subsequent threshold value is reached, or the threshold value is reached The alarm is repeatedly generated at a predetermined cycle until the alarm is generated.

And to transmit a control signal for interrupting the power supply through the circuit breaker 2A within 20 ms when static electricity, leakage current, or arc exceeding the threshold value is generated.

The circuit breaker control unit 35 is configured to control the circuit breaker 1A when the circuit breaker 1A is controlled by static electricity or overcurrent and the power supply to the switchboard 1 needs to be cut off At this time, the breaker control unit 35 is configured to set the time for which the power of the circuit breaker 1A is cut off differently according to the static electricity or the overcurrent by the user.

In addition, the controller 30 may further include an alarm controller 36. When the electrostatic voltage value and the overcurrent current value, which are detected in real time, reach a preset threshold value, the alarm controller 36 sets a predetermined alarm control signal To the alarm 1B to generate an alarm.

The electrostatic voltage value and the overcurrent current value detected in real time and the control information of the circuit breaker 1A and the alarm 1B are stored in the storage unit or the memory provided in the control unit 30 and stored in the unit of the predetermined time or day.

The operation of the circuit breaker 1A and the alarm 1B is automatically controlled according to the voltage value of the static electricity and the leakage current value according to the threshold set by the user by the configuration of the controller 30 as described above.

The display unit 40 receives a signal from the control unit 30 and outputs the electrostatic voltage value and the leakage current value detected in real time to the screen on the basis of the operating states of the circuit breaker 1A and the alarm apparatus 1B.

The display unit 40 is configured as a touch screen so that a user can easily set a threshold value, and is configured to output in real time graph form so that the electrostatic voltage value and the leakage current value detected in real time can be intuitively confirmed.

The display unit 40 is installed in a sight window (not shown) of the switchboard 1 so that the user can easily check the electrostatic voltage value and the leakage current value in real time in real time even if the user does not open the door of the switchboard 1 .

However, the insulation breakdown sensing device 2 according to the present invention may be installed in a switchgear, a high-voltage unit, a low-voltage unit, a motor control panel, a distribution board, or the like. It will be understood that the present invention is not limited thereto.

As described above, according to the present invention, the current value leaking from the panel and frame of the switchboard and the voltage of the static electricity are directly detected by the user, and the breaker and the alarm are controlled according to the detected current value and voltage value. An electric shock accident caused by a leaked electric current in the process of inspecting or operating the panel of the inverter is prevented.

Although the preferred embodiments of the present invention have been disclosed for illustrative purposes, those skilled in the art will appreciate that various modifications, additions and substitutions are possible, without departing from the scope and spirit of the invention as disclosed in the accompanying claims. It is to be understood that the scope of the present invention should not be construed as being limited only by the appended claims and should not be construed as limiting the scope of the present invention to those of ordinary skill in the art. It will be very self-evident.

1: Switchboard 2: Continuous sensing device for insulation breakdown
1A: Breaker 1B: Alarm
10: Leakage current detector 11: Electrostatic sensor
11A: Sensor body 11B: Voltage sensing unit
11B: arc detection unit 12: first leakage current detection sensor
13: second leakage current detection sensor 14: vibration detection sensor
20: Signal processing section 21: Noise filter
22: amplifier 23; A / D converter
30: control unit 31: electrostatic voltage determination unit
32: overcurrent current judgment unit 33: wireless communication unit
34: Threshold comparator 35: Breaker controller
36: Alarm controller 40:

Claims (5)

An electrical switchboard (1) having an insulation breakdown constantly sensing device (2) for controlling a breaker (1A) and an alarm (1B) by measuring a leakage current inside the switchboard
The insulation breakdown sensing device (2)
A leakage current detector 10 installed inside the switchboard 1 for detecting a leakage current;
A signal processor 20 for processing the signal detected by the leakage current detector 10;
A controller 30 for receiving signals processed by the signal processor 20 and comparing the signals with preset reference values, and controlling the operation of the circuit breaker 1A and the alarm 1B according to the comparison result; And
A display unit 40 receiving a signal from the controller 30 and outputting an operation state and a leakage current value of the circuit breaker 1A and the alarm 1B;
Lt; / RTI >
The leakage current detector (10)
And a static electricity sensing sensor (11) for sensing the voltage of static electricity generated in the panel and frame of the switchboard (1)
The control unit (30)
An electrostatic voltage determination unit (31) for determining an electrostatic voltage value from a signal transmitted from the signal processing unit (20);
A limit lock current determination unit (32) for determining an overcurrent current value from a signal transmitted from the signal processing unit (20);
A wireless communication unit 33 for wirelessly communicating the control unit 30 with an external device;
A threshold comparator 34 for comparing the electrostatic voltage value and the over-lock current value determined by the electrostatic voltage determiner 31 and the over-lock current determiner 32 with a threshold preset by the user; And
A breaker controller 35 for applying a cutoff control signal to the breaker 1A according to the comparison result of the threshold comparator 34;
And a controller for detecting an insulation breakdown of the switchboard.
The method according to claim 1,
The leakage current detector (10)
A first leakage current detection sensor (12) for detecting a current value leaking into the panel and the frame of the switchboard (1);
A second leakage current detection sensor (13) for detecting a current value leaking to a terminal ground of the switchboard (1);
And a controller for detecting an insulation breakdown of the switchboard.
The method according to claim 1,
The signal processing unit (20)
A noise filter (21) for removing noise included in the analog signal detected by the leakage current detector (10);
An amplifier 22 for amplifying an analog signal from which the noise is removed by the noise filter 21; And
An A / D converter 23 for converting the analog signal amplified by the amplifier 22 into a digital signal;
And a controller for detecting an insulation breakdown of the switchboard.
delete The method according to claim 1,
The threshold value comparison unit (34)
When the electrostatic voltage value or the over-lock current value of the signal transmitted from the signal processing unit 20 reaches 70 to 95% of the threshold value, the alarm unit 1B). 2. The switchboard of claim 1, further comprising:

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