KR100353395B1 - A distuributing board installed a removal device of noise and surge voltage - Google Patents

Abstract

The present invention relates to a switchboard having a built-in noise and surge voltage removing device, and more particularly, to remove noise of a high frequency and low frequency band included in a power source introduced into a switchboard, and to generate a transient voltage or lightning generated when a switch is operated. The present invention relates to a switchgear with a built-in noise and surge voltage removing device for preventing malfunction and damage of various electric and electronic devices by supplying a stable power supply to a load by removing the instantaneous surge voltage.

In the switchboard having the noise and surge voltage removing device of the present invention, a main circuit breaker having a total power control function is connected to an incoming wire inside the case, and the electric current supplied from the main circuit breaker is distributed to each place as necessary. A plurality of auxiliary circuit breakers are installed, and noise is included between the main circuit breaker and the auxiliary circuit breaker to remove noise included in the incoming power supply, and to remove an instantaneous surge voltage caused by a transient voltage or lightning generated during a switch operation. In the surge voltage removing device is installed, the noise and surge voltage removing device is provided with a first to third coaxial cable, the first to third ferrite core is provided on one outer peripheral surface of the first to third coaxial cable On the other outer peripheral surface of the first to third coaxial cable, the fourth to sixth ferrite of the tubular shape And a through type capacitor is inserted into the first and third coaxial cables of the portion connected to the active wire and the neutral wire, and the first between the first to third ferrite cores and the fourth to sixth ferrite cores. The third coaxial cable is characterized in that the discharge tube for converting the surge voltage or the sudden voltage, etc. by converting the light energy to remove, and in another embodiment, the low-frequency noise removing unit is added to the output side of the noise and surge voltage removing device It features.

Description

A distuributing board installed a removal device of noise and surge voltage}

The present invention relates to a switchboard having a built-in noise and surge voltage removing device, and more particularly, to remove noise of a high frequency and low frequency band included in a power source introduced into a switchboard, and to generate a transient voltage or lightning generated when a switch is operated. The present invention relates to a switchgear with a built-in noise and surge voltage removing device for preventing malfunction and damage of various electric and electronic devices by supplying a stable power supply to a load by removing the instantaneous surge voltage.

Generally used switchboard is provided with a case 50, as shown in Figure 1, the case 50, the main circuit breaker 51 having a total power control function is connected to the incoming wire (P), A plurality of auxiliary circuit breakers 52 are provided to distribute and transmit the current applied from the main circuit breaker 51 to each place as necessary, and the main circuit breaker 51 and the auxiliary circuit breaker 52 are main current lines 53. The plurality of auxiliary circuit breakers 52 are connected to the current distribution line 54 so that the current applied by the main current line 53 is transmitted to the required element.

Conventional switchgear having such a configuration is to supply the power flowing through the incoming wire (P) to the auxiliary circuit breaker 52 via the main circuit breaker 51 and the main line flow line 53, in the auxiliary circuit breaker 52 Through the current distribution line 54 to supply a plurality of loads, electrical and electronic equipment, by stopping the power supply by the operation of the main circuit breaker 51 and the auxiliary circuit breaker 52 in the event of a short circuit or overcurrent of the line or load It is designed to prevent damage to load or occurrence of fire in advance.

In the switchboard, a vibration current flows between the active wire and the neutral wire in the process of supplying power from the lead wire P to the main circuit breaker 51, and thus, a wave of an electric field having electrical properties from the electrode and a magnetic field having magnetic properties. Waves of are propagated into space, and harmful electromagnetic waves are generated by irregular electromagnetic disturbance of electrons or ions.

In particular, since the electromagnetic wave included in the power flowing through the active wire and the neutral wire (P) contains a lot of high frequencies in the 20 MHz to 3 GHz band, these high frequencies act as noise in various electric and electronic devices, resulting in malfunction of the device. In addition, if the surge voltage caused by lightning strike or transient voltage (Burst, EFT) generated during switch operation flows through the incoming wire (P), the switchboard itself may be damaged as well as the load. It is essential to have a device that removes high frequency noise and surge voltage since it may cause damage.

SUMMARY OF THE INVENTION The present invention is to meet the requirements as described above, and includes a coaxial cable connected to a power supply wire drawn into a switchboard, a through-type capacitor on one side of the coaxial cable, and a tubular ferrite core on the outer circumference of the coaxial cable. Are installed at predetermined intervals to attenuate and eliminate noise in the 20 MHz to 3 GHz band included in the incoming power supply, and discharge tubes are installed in the coaxial cables between the ferrite cores to convert instantaneous surge and transient voltages into light energy. It is a technical problem to supply a stable power supply to loads of various electric and electronic devices by converting and removing them so as to prevent malfunction and damage of the electric and electronic devices.

In the switchboard having the noise and surge voltage removing device of the present invention, a main circuit breaker having a total power control function is connected to an incoming wire inside the case, and the electric current supplied from the main circuit breaker is distributed and transmitted to each place as necessary. One or more auxiliary circuit breakers are installed to remove noise included in the power input between the main circuit breaker and the secondary circuit breaker, and to remove noise and surges that remove instantaneous surge voltages due to transient voltage or lightning generated during a switch operation. In the voltage removing device is installed, the noise and surge voltage removing device is provided with a first to third coaxial cable connected to the active line, the neutral line and the ground, one side outer peripheral surface of the first to third coaxial cable of the high frequency band Tubular first to third ferrite cores are installed to remove noise. On the other outer circumferential surface of the first to third coaxial cables, tubular fourth to sixth ferrite cores for removing noise not removed from the first to third ferrite cores are installed and connected to the active and neutral wires. The first and third coaxial cables of the portion to be inserted are provided with a through-type capacitor formed integrally with the conductive plate connected to the ground line, and the first to third ferrite cores and the fourth to sixth ferrite cores. The third coaxial cable is characterized by consisting of a discharge tube for converting the surge voltage or sudden voltage, etc. by converting the light energy into light energy. In another embodiment, the output of the noise and surge voltage removing device of the low frequency band included in the incoming power source A low frequency noise removing unit for removing noise is added.

1 is a block diagram of a general switchboard.

2 is a schematic configuration diagram of a switchboard according to the present invention;

Figure 3 of the switchboard with a built-in noise and surge voltage removing device according to the present invention

Perspective view.

4 is a cross-sectional view taken along the line A-A of FIG.

5 is an equivalent circuit diagram of a noise and surge voltage removing device according to the present invention.

6 illustrates another embodiment of the noise and surge voltage removing device according to the present invention.

Schematic shown.

Figure 7 is a switchboard with a built-in noise and surge voltage removing device according to the present invention

Graph showing noise rejection measurement results in the high frequency region.

8 is a switchboard with a built-in noise and surge voltage removing device according to the present invention

Graph showing the measurement result of surge voltage elimination.

FIG. 9 is a noise reduction measurement result in a low frequency region in another embodiment of FIG.

Graph showing.

<Description of Signs of Major Parts of Drawings>

4a to 4c: first to third coaxial cables

6a-6f: 1st-6th ferrite core

7a: first discharge tube 7b: second discharge tube

8: conductive plate 9a: first through-type capacitor

9b: second through capacitor 10a: high frequency noise removing unit

10b: residual noise removing unit 20: surge voltage removing unit

30: low frequency noise removing unit 31: filter circuit

100: noise and surge voltage removing device

P1: active line P2: neutral line GND: ground line

Hereinafter, the configuration and operation of the present invention will be described in detail with reference to FIGS. 2 to 9.

FIG. 2 is a configuration diagram of a switchboard according to the present invention, in which a case 50 is provided, and an inside wire P of the active wire P1 and the neutral wire P2 is connected to the case 50 to provide overall power. A main circuit breaker 51 having a control function and a plurality of auxiliary circuit breakers 52 are provided so as to distribute and transmit current applied from the main circuit breaker 51 to each place as necessary.

And the noise and surge voltage removing device 100 of the present invention is installed between the main circuit breaker 51 and the auxiliary circuit breaker 52, the auxiliary circuit breaker 52 is the main current through the noise and surge voltage removing device 100 Connected by a line 53, a plurality of auxiliary circuit breakers 52 are connected to a current distribution line 54 which causes the current supplied by the main current line 53 to be transmitted to the required element.

3 is a perspective view of a noise and surge voltage removing device 100 according to the present invention, and includes first to third coaxial cables 4a to 4c connected to an active line P1, a neutral line P2, and a ground GND. Is provided, and one side outer circumferential surface of the first to third coaxial cables (4a to 4c) is a high frequency noise provided with tubular first to third ferrite cores (6a to 6c) for removing noise in the 20MHz ~ 3GHz high frequency band Remover (10a) is provided, the other outer peripheral surface of the first to third coaxial cables (4a to 4c) of the tubular fourth to fourth to remove the residual noise that was not removed from the high frequency noise removing unit (10a) The residual noise removing part 10b which consists of six ferrite cores 6d-6f is provided.

The first and third coaxial cables 4a and 4c of the portion connected to the active line P1 and the neutral line P2 are integrally formed in the conductive plate 8 connected to the ground line GND. The capacitors 9a and 9b are inserted into each other, and the second coaxial cable 4b is connected to the conductive plate 8 to form a ground.

The first to third ferrite cores 6a to 6c, which are the high frequency noise removing unit 10a, and the first to third portions between the fourth to sixth ferrite cores 6d to 6f, which are the residual noise removing unit 10b. The coaxial cables 4a to 4c have first and second discharge tubes 7a and 7b for converting and removing instantaneous transient voltages generated during operation of a switch or the like and surge voltages generated by lightning, etc., into light energy. The noise and surge voltage removing device 100 including the connected surge voltage removing unit 20 is constituted.

The noise and surge voltage removing device 100 is installed by the case 50 insulation cover of the switchboard, and may be separately installed outside the switchboard as necessary.

4 is an equivalent circuit diagram of a noise and surge voltage removing device 100 according to the present invention, and is largely connected to an active line P1 (P2) and a ground line GND of an incoming wire, and thus noise of a high frequency band of 20 MHz to 3 GHz. And a high frequency noise removing unit 10a for removing the light, and at the output terminal of the high frequency noise removing unit 10a, a transient surge voltage generated by an excessive voltage or lightning generated during operation of a switch or the like as light energy. The surge voltage removing unit 20 of the discharge tube for converting and removing is connected, and residual noise that is not removed by the high frequency noise removing unit 10a between the output terminal of the surge voltage removing unit 20 and the auxiliary circuit breaker 52 of the switchboard. Residual noise removing section 10b for removing the signal is connected.

Here, the high frequency noise removing unit 10a is a pair of high frequency removing filter circuits connected to the incoming wire P, and the first to third ferrites are formed on the active line P1, the neutral line P2, and the ground line GND. The first to third coils L1 to L3, which are magnetic field components induced on the surfaces of the cores 6a to 6c, are connected to each other, and the through-type capacitors 9a and 9b for bypassing the frequency noise of a specific band are grounded. It is composed of parallel connection around the line GND.

In addition, the surge voltage removing unit 20 is connected in parallel to the output terminals of the first to third coils L1 to L3 to light an instantaneous surge voltage generated by an excessive voltage or lightning generated during operation of a switch or the like. A pair of 1st, 2nd discharge tube 7a (7b) converted into energy and removed is connected in parallel with the ground line GND.

In addition, the residual noise removing unit 10b may be connected to an output terminal of the surge voltage removing unit 20 and may be a fourth to sixth coil L4, which is a magnetic component induced on the surface of the fourth to sixth ferrite cores 6d to 6f. L6 is connected, and the output terminals of the fourth to sixth coils L4 to L6 are connected to the input terminal of the auxiliary circuit breaker 52 of the switchboard.

FIG. 7 is a graph illustrating a measurement result of noise removal in a high frequency region in a switchboard having a noise and surge voltage removing device according to the present invention, and FIG. 8 is a graph illustrating a measurement result of surge voltage removal.

The switchboard with the built-in noise and surge voltage removing device according to the present invention made as described above, first, in-phase mode noise of a specific band from the high-frequency noise of 20MHz ~ 3GHz band generated through the active line (P1) and the neutral line (P2) Through-flow condenser 9a, 9b, which is a high frequency noise removing unit 10a, flows to the ground line GND to bypass.

At this time, the high frequency noise that is not bypassed through the through-type capacitors 9a and 9b includes first to third ferrite cores 6a to 6c provided on the active line P1, the neutral line P2, and the ground line GND. The direction of the magnetic field is induced constantly by the first to third coils L1 to L3 which are the magnetic field components of.

That is, the direction of the magnetic field induced by the active line P1 flows to the ground line GND through the first and second coils L1 and L2, and the direction of the magnetic field induced by the neutral line P2 is third. And as the flow through the second coil (L3) (L2) to the ground line (GND) is to absorb the magnetic field of the active line (P1) and the neutral line (P2) to the ground.

In addition, when a transient voltage generated during operation of a switch or the like or an instantaneous voltage generated by lightning or the like flows into the active line P1 and the neutral line P2, the voltage is a surge voltage removing unit 20. First, it is removed by the discharge tubes 7a and 7b.

That is, the surge voltage flowing into the active line P1 flows to the ground line GND through the first discharge tube 7a, and the surge voltage flowing into the neutral line P2 is grounded through the second discharge tube 7b. As the path flowing to the line GND is formed, the surge voltage is removed by converting the surge voltage and the transient voltage into light or thermal energy and discharging the first and second discharge tubes 7a and 7b.

On the other hand, the incoming power supply via the high frequency noise removing unit 10a and the surge voltage removing unit 20 removes the noise that has not been removed by the residual noise removing unit 10b.

That is, the noise included in the inflow power supply via the high frequency noise removing unit 10a and the surge voltage removing unit 20 flows through the residual noise removing unit 10b, and at this time, the active line P1 and the neutral line P2. The magnetic field induced on the surface of the magnetic field is constantly induced by the fourth to sixth coils L4 to L6, which are magnetic fields of the fourth to sixth ferrite cores 6d to 6f.

That is, the direction of the magnetic field induced on the surface of the active line P1 flows to the ground line GND through the fourth and fifth coils L4 and L5, and the magnetic field induced on the surface of the neutral line P2. As the direction flows to the ground line GND through the sixth and fifth coils L6 and L5, the magnetic field directions induced by the active line P1 and the neutral line P2 are absorbed by the ground, thereby removing the high frequency noise. Secondary filtering of high frequency noise that could not be removed in 10a).

Therefore, as described above, the stable power supply via the high frequency noise removing unit 10a, the surge voltage removing unit 20, and the residual noise removing unit 10b is distributed through the auxiliary circuit breaker 52 of the switchboard, thereby preventing noise from the high frequency band. Supplying a stable current without the surge voltage to the load.

7 is a graph showing the noise measurement result of the noise and surge voltage removing device 100 according to the present invention in the high frequency region, and the measured value without using the device compared to the measured value A without using the device. It can be seen that (B) is attenuated by 20 to 30 decibels (dB) over the entire range of 20 MHz to 3 GHz.

8 is a graph illustrating a result of surge voltage measurement in the noise and surge voltage removing device 100 according to the present invention. When the surge input voltage of the measuring equipment is 3,500 V and the input current flows at 1,000 A, the present invention is removed. Through the device, the output voltage is 424V, which shows that the surge voltage elimination effect is very high.

Figure 6 is an equivalent circuit diagram showing another embodiment of a switchboard with a built-in noise and surge voltage removing device according to the present invention, a low frequency noise removing unit to remove the noise contained in the 150KHz ~ 30MHz low frequency band relatively low compared to high frequency (30) was added.

That is, the low frequency noise canceling unit 30 is in-phase mode noise of a specific band in the low frequency of 150KHz ~ 30MHz band between the active line (P1) and the neutral line (P2) via the noise and surge voltage removal device 100 Bypass capacitors C1 and C2 that are removed by passing through the ground line are connected in parallel, and the capacitors C3 and C4 and the seventh and eighth coils are formed after the bypass capacitors C1 and C2. A filter circuit 31 composed of L7 and L8 is connected, and a loss compensation resistor R is connected in parallel to an output terminal of the filter circuit 31.

Here, the seventh and eighth coils L7 and L8 are coils wound on a ring ferrite core and have a structure effective for low frequency removal.

The low frequency noise removing unit 30 formed as described above is in phase of a specific band among the low frequency noise of 150 KHz to 30 MHz band generated through the active line P1 and the neutral line P2 via the noise and surge voltage removing device 100. Mode noise is removed by flowing through the bypass capacitor (C1) (C2) to the ground line.

At this time, the low frequency noise that is not removed through the bypass capacitors C1 and C2 is the capacitors C3 and C4 of the filter circuit 31 connected to the active line P1 and the neutral line P2, and the seventh and eighth. It is removed by the coils L7 and L8.

That is, the direction of the magnetic field guided by the active line P1 and the neutral line P2 is removed by inducing them in opposite directions through the seventh and eighth coils L7 and L8 to cancel each other.

FIG. 9 is a graph illustrating a noise removal measurement result in a low frequency region of a power supply via the low frequency noise removing unit 30. When a frequency of 3 KHz to 6 GHz is introduced through a measuring device, 20 to 20 to all bands in a range of 150 KHz to 30 MHz. You can see that it is attenuated by 60 decibels (dB).

As described above, the switchboard in which the noise and surge voltage removing device of the present invention is incorporated is provided with a coaxial cable connected to a power line introduced into the switchboard. By installing ferrite cores respectively, the high frequency and low frequency band noise included in the incoming power source is bypassed and absorbed, and a discharge tube is installed in the coaxial cable between the ferrite cores to generate the transient voltage generated during operation of a switch. By converting and removing the surge voltage generated by lightning and lightning to light energy, it is effective to prevent malfunction and damage of electric and electronic devices by supplying stable power to loads of various electric and electronic devices.

Claims (3)

( delete ) (Correction) The main circuit breaker 51 having a total power control function connected to the incoming wire P inside the case 50, and distributes the current supplied from the main circuit breaker 51 to each place as needed. A plurality of auxiliary circuit breakers 52 are installed to be transmitted, Noise and surge voltage removal device to remove noise included in the power input between the main circuit breaker 51 and the secondary circuit breaker 52, and to remove the instantaneous surge voltage due to the transient voltage or lightning generated during the switch operation. In that 100 is installed, The noise and surge voltage removing device 100 includes first to third coaxial cables 4a to 4c connected to the active line P1, the neutral line P2, and the ground GND. On one outer circumferential surface of the first to third coaxial cables 4a to 4c, tubular first to third ferrite cores 6a to 6c for removing noise in a high frequency band are provided. The other outer peripheral surface of the first to third coaxial cables 4a to 4c has a tubular fourth to sixth ferrite core 6d for removing noise that is not removed from the first to third ferrite cores 6a to 6c. ~ 6f) is installed, Through-type capacitors formed integrally with the conductive plate 8 connected to the ground line GND in the first and third coaxial cables 4a and 4c of the portions connected to the active line P1 and the neutral line P2. (9a) (9b) is inserted and installed, The first to third coaxial cables 4a to 4c between the first to third ferrite cores 6a to 6c and the fourth to sixth ferrite cores 6d to 6f may have a surge voltage or an unexpected voltage. Switchgear with a built-in noise and surge voltage removing device, characterized in that consisting of a discharge tube (7a) (7b) to convert to remove. 5. The low frequency noise canceller 30 for removing noise in the low frequency band included in the incoming power source is added to the output side of the noise and surge voltage removing apparatus 100. Switchgear with built-in noise and surge voltage canceller.