KR101811008B1 - Surge protective device having a function of indicating lightning of power line respectively - Google Patents

Abstract

The present invention relates to a surge protection device having a function for separating and displaying a line struck by lightning. According to an embodiment of the present invention, the surge protection device includes: upper line surge protection devices (MOV1, MOV2, MOV3); temperature detection switches (B/R, B/S, B/T); thyristors (Q3, Q2, Q1); a DC type pulse generating unit; phase differentiation lightning strike warning LED (LED4, LED3, LED2); and a reset switch. The surge protection device can protect a power distribution system from a lightning strike, separate and display the line struck by lightning, and maintain the display for notifying the lightning strike even after the lightning strike disappears.

Description

TECHNICAL FIELD [0001] The present invention relates to a surge protector having a lightning line segment display function,

The present invention relates to a surge protection device for protecting a power distribution system from a lightning stroke, and more particularly, to a surge protection device for separating and displaying a line in which a lightning has occurred and for displaying a lightning- To a surge protection device.

Generally, Surge Protective Device (SPD) is a device installed in the water front or in the switchboard to protect the power distribution system from surges such as lightning. When a lightning strikes the transmission system, a surge voltage is generated. If such a surge voltage is transmitted to the load side as it is, the electrical equipment on the load side may be damaged or the distribution system may become unstable. The surge protection device bypasses the surge voltage to the neutral line or ground and prevents it from being transmitted to the load side.

If a surge protector is operated in the switchboard, the surge protector may be damaged by a lightning strike or a fault may occur in the system, and a manager or maintenance person needs to recognize this as quickly as possible. It is necessary to confirm whether or not the surge protection device operates in order to analyze the influence of the lightning stroke even if no breakage or failure occurs.

Korean Patent Publication No. 10-2013-0035449 discloses a lightning-surveillance monitoring system. A counter relay for counting the voltage applied to the capacitor when the voltage applied to the capacitor is equal to or higher than a specified voltage; and a counter relay for counting the voltage applied to the capacitor, ≪ / RTI > describes a system for digitally monitoring outputs.

However, the above-mentioned prior art documents a problem of detecting the lightning stroke of a steel tower for a transmission line and presents some problems when it is applied to a power distribution system.

Typically, the domestic distribution system consists of three-phase four-wire system. In the power distribution system, it is necessary to check which phase the lightning has occurred in the event of a lightning stroke. If you can identify the phase in which a lightning stroke occurred before performing maintenance, you will be able to quickly normalize the power distribution system. However, the preceding literature does not list the factors that distinguish the phases in which a lightning stroke occurred.

In addition, in the power distribution system, if a lightning stroke occurs, the circuit breaker may operate. In this case, the power supply to the system for indicating occurrence of a lightning stroke is interrupted, In the above prior art document, whether or not a lightning strike is displayed in a digital manner and a battery is used as a power source. However, when the remaining capacity of the battery is small or its life is short, the display period of a lightning stroke is inevitably shortened. There is a problem that if the manager leaves his seat and returns, he may be ignorant of the occurrence of the lightning stroke. In addition, if the worker is dispatched for maintenance, the monitoring device is turned off, and it is possible to work without recognizing the information on the lightning, which may cause a safety accident.

Korean Patent Publication No. 10-2013-0035449

The present invention provides a surge protection device that is installed in a switchboard to protect a power distribution system from a lightning strike, and displays a lightning strike for each phase. And to provide a surge protection device having a lightning line segment display function capable of accurately confirming and quickly performing maintenance.

A surge protection device having a lightning line segment display function according to an embodiment of the present invention is a surge protection device installed in a three-phase power line of R, S, and T to protect a power distribution system from lightning, MOV1, MOV2, and MOV3, which are installed between the neutral line and the receiving line at the rear end of the circuit breaker to cut off the power supply to the load side in each of the S-phase, T-phase, and T-phase power supply lines, ); And a bimetallic switch disposed adjacent to each of the commercial surge protection devices MOV1, MOV2 and MOV3 and closing when the ambient temperature reaches a predetermined value, and corresponding to the commercial surge protection devices MOV1, MOV2 and MOV3 (B / R) connected to a trip coil for tripping the breaker, the other end of the temperature detection switch being connected to each of the three-phase receiving lines at the rear end of the circuit breaker, B / S, B / T); Wherein a gate terminal is connected to each of the temperature detection switches B / R, B / S and B / T, and is turned on when the temperature detection switches B / R, B / S and B / (Q3, Q2, Q1); A Zener diode (hereinafter, referred to as a Zener diode) which receives the commercial AC power from any one of the power lines of the R phase, the S phase, and the T phase power line, operates by receiving power from the transmission line at the front end of the circuit breaker, And a capacitor (C1) for smoothing the half-wave rectified phase to compensate a zero phase in a rectified phase to a predetermined positive phase, and generating a DC type pulsation to generate a thyristor (Q3) , Q2, and Q1 to the respective anode terminals; LEDs (LED4, LED3), which are connected between the DC pulsator and each of the thyristors (Q3, Q2, Q1) and are lit when the thyristors (Q3, Q2, Q1) , LED2); And a reset switch for bypassing the output of the DC pulsating current generator to the ground side to drop the anode terminal of the thyristor Q3, Q2, Q1 to zero potential.

The surge protection device having the lightning line segment display function according to another embodiment of the present invention further includes a lightning arrester connected between the commercial line surge protection elements MOV1, MOV2, MOV3 and the common connection point between the neutral line and ground .

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In the surge protection device having the lightning line segment display function according to another embodiment of the present invention, a fuse F1 is further provided between the power input terminal of the breaker and the DC current generation unit.

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A surge protection device having a lightning line segment display function according to still another embodiment of the present invention is characterized in that the DC type pulse current generation device is provided between the power input terminal of each of the LEDs for the upper classification lightening warning LEDs (LED4, LED3, LED2) And Schottky diodes (SD1, SD2, SD3) for bypassing the output of the negative voltage are provided.

According to the surge protection device having the lightning line segment display function of the present invention, the maintenance of the equipment can be performed quickly by accurately distinguishing and displaying the commercial line in which the lightning has occurred, and the reset switch can be manually operated It is possible to appropriately respond to the occurrence of a lightning strike in the absence of a manager by making the lightning stroke display warning lamp be continuously lit up.

1 is a circuit diagram illustrating a surge protection device having a lightning line segment display function according to the present invention.
2 is a circuit diagram illustrating a circuit configuration for an R phase in the present invention,
3 is a block diagram illustrating a semiconductor layer structure of a thyristor according to the present invention,
4 is a diagram illustrating a circuit configuration of a thyristor applied to the present invention, and Fig.
5 is a waveform diagram illustrating an output waveform of the DC pulsating current generator in the present invention.

Hereinafter, specific embodiments according to the present invention will be described with reference to the accompanying drawings. It is to be understood, however, that the invention is not to be limited to the specific embodiments, but includes all modifications, equivalents, and alternatives falling within the spirit and scope of the invention.

Parts having similar configurations and operations throughout the specification are denoted by the same reference numerals. It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory and are intended to provide further explanation of the invention as claimed.

In the following description of the embodiments, redundant descriptions and explanations of techniques obvious to those skilled in the art are omitted. Also, in the following description, when a section is referred to as "comprising " another element, it means that it may further include other elements in addition to the described element unless otherwise specifically stated.

 Also, the terms "to", "to", "to", and "modules" in the specification mean units for processing at least one function or operation, and may be implemented by hardware or software or a combination of hardware and software . In addition, when a part is electrically connected to another part, it includes not only a case directly connected but also a case where the other parts are connected to each other in the middle.

Terms including ordinals, such as first, second, etc., may be used to describe various elements, but the elements are not limited to these terms. The terms are used only for the purpose of distinguishing one component from another. For example, without departing from the scope of the present invention, the second component may be referred to as a first component, and similarly, the first component may also be referred to as a second component.

1 is a circuit diagram illustrating a surge protection device having a lightning line segment display function according to the present invention.

1, a circuit breaker 100 is provided between a power supply terminal and a power supply terminal of the R phase, S phase, and T phase power supply lines. The circuit breaker 100 is opened when the trip coil 110 is excited, Power supply to the power supply side is cut off.

Surge voltage surge protection elements 210, 310, and 410 are provided between the respective R, S, and T power supply lines and the neutral line at the rear end of the circuit breaker 100 to absorb surges drawn from power supply lines of respective phases. More specifically, a first trunk line surge protection element 210, MOV1 between the R phase and the N phase, a second trunk line surge protection element 310, MOV2 between the S phase and the N phase, And male line surge protection elements 410 and MOV3 are provided.

The male line surge protection elements 210, 310, and 410 are elements that bypass the surge to the neutral line side to prevent the surge from being transmitted to the load side. In this embodiment, the male line surge protection elements 210, 310, and 410 are made of a metal oxide varistor (MOV) having nonlinear voltage-current characteristics, The current flows and the surge is bypassed to the ground side. According to the characteristics of the MOV, when a lightning stroke passes, it generates heat corresponding to the amount of lightning current. In addition, when lightning occurs in a bundle, when the capacity is exceeded, when the life is over, a lot of heat is generated. In the present invention, a lightning stroke is detected based on such a principle.

The lightning arresters 160 and 170 may be further provided between the common connection point between the commercial line surge protection elements 210, 310 and 410 and the neutral line and the ground. The lightning arrester is a device for discharging a large current generated by a lightning strike to the earth side. The lightning arrester may be installed alone or in combination with a plurality of lightning arresters such as a first lightning arrester 160 and a second lightning arrester 170 arranged in parallel, .

The temperature detection switches 220, 320, and 420 are disposed adjacent to the commercial line surge protection elements 210, 310, and 410, respectively, when the commercial line surge protection elements 210, 310, and 410 are overheated. As shown in the drawing, the first temperature detection switch 220 (B / R) is physically disposed adjacent to the first trunk line surge protection element 210, and is connected in parallel to the R phase power supply line with a reverse current prevention diode ). The second temperature detection switch 320 (B / S) is physically disposed adjacent to the second commercial surge protection element 310, and is connected to the S phase power line through a reverse current prevention diode D2 do. The third temperature detection switch 420 (B / T) is physically disposed adjacent to the third trunk line surge protection element 410, and is connected to the T phase power line through a reverse current prevention diode D3 do.

For example, the temperature detection switches 220, 320, and 420 may be configured as bimetallic switches that close the contacts when the ambient temperature reaches a predetermined value.

The temperature detection switches 220, 320 and 420 are connected in common through reverse current prevention diodes D9, D10 and D11 and the trip coil 110 of the circuit breaker 100 is connected between the common connection point and the ground. That is, when any one of the three temperature detection switches 220, 320, and 420 is closed, power is applied to the trip coil 110 and the breaker 100 is opened.

In the state that the circuit breaker 100 is in the ON state, the power indicator LED 140, which is commonly connected to the R phase, the S phase, and the T phase and is turned on when the power is turned on, The LED 140 is turned off. The power indicator LED (140) emits green light to indicate whether power is turned on or not.

Each of the temperature detection switches 220, 320, and 420 is individually connected to the switching circuit units 230, 330, and 430. Then, the LEDs 240, 340, and 440 for the upper classification lightening warning are turned on by the switching operation of each of the switching circuit units 230, 330, and 430.

One end of the first temperature detection switch 220 is connected to the first switching circuit unit 230. When the first temperature detection switch 220 is closed, the switching operation of the first switching circuit unit 230 causes the first phase- The lightening warning LED (240, LED4) is turned on by turning on the power. Similarly, one end of the second temperature detection switch 320 is connected to the second switching circuit portion 330, and when the second temperature detection switch 320 is closed, the switching operation of the second switching circuit portion 330 2 phase classification Lightning warning LED (340, LED3) is turned on with power applied. One end of the third temperature detection switch 420 is connected to the third switching circuit unit 430 and the third switching circuit unit 330 is connected to the third temperature detection switch 420 when the third temperature detection switch 420 is closed. Power is applied to LED (440, LED2) for lightning warning.

That is, the LEDs 240, 340, and 440 for the three phase-separated lightning-warning LEDs indicate lightning occurrence on R phase, S phase, and T phase, Are all emitted in red.

Here, after the occurrence of the lightning stroke, the heat generated from the commercial surge protection elements 210, 310, and 410 is radiated to open the temperature detection switches 220, 320, and 420. Further, after the breaker 100 is operated by the lightning stroke, the power supply to the load side is cut off. If the lighting of the upper classification lightening warning LEDs 240, 340, 440 is stopped by the opening of the temperature detection switches 220, 320, 420 or the shutting operation of the breaker 100, You will not be able to confirm that you did. In order to prevent this, the surge protection device having the lightning line segment display function of the present invention provides a configuration for continuously lighting the LEDs 240, 340, and 440 for warning light of the upper division.

Fig. 2 is a circuit diagram illustrating a circuit configuration for an R phase in the present invention, and is a diagram showing a lightning line classification display circuit for an R phase in a circuit diagram of Fig. 1. Fig. Hereinafter, the lightning ray line classification display circuit for the R phase will be described as an example, but the following description is also applicable to the S phase and the T phase.

Referring to FIG. 2, when the first temperature detection switch 220 is closed, a current flows in a forward direction through the diode D7 of the first switching circuit unit 230. The voltage is lowered to the signal voltage level by the partial pressure of the resistor R11 and the resistor R10 connected in parallel, and the lowered voltage is applied to the gate terminal of the thyristor Q3. The anode terminal of the thyristor (Q3) is connected to the LED 240 for the first phase-division lightning warning, and the cathode terminal is grounded.

FIG. 3 is a block diagram illustrating a semiconductor layer structure of a thyristor according to the present invention, and FIG. 4 is a diagram illustrating a circuit configuration of a thyristor applied to the present invention. As shown in FIG. 3, the thyristor Q3 has a structure in which P, N, P, and N semiconductor layers are sequentially stacked from the anode terminal to the cathode terminal, and gate terminals are drawn out from the third P semiconductor layer. Therefore, as shown in FIG. 4, the PNP transistor and the NPN transistor have a combined circuit structure.

In this type of thyristor Q3, when a DC pulse current having no zero point of the phase is applied to the anode terminal after the trigger signal is applied to the gate terminal and turned on, even if the signal of the gate terminal is turned off, on state. The present invention makes it possible to maintain the lighting of the first phase-separated lightening warning LED 240 even after the lightning has been extinguished by using the characteristics of the thyristor Q3.

Referring to FIG. 2, a DC pulsator generating unit 130 is provided between an R phase power line (or a power source line of another phase) and an anode terminal of the thyristor Q3. The DC pulsating current generator 130 rectifies the commercial AC power and applies a zero phase to the anode terminal of the thyristor Q3 with a predetermined positive phase.

More specifically, the DC pulsating current generator 130 is connected to the line drawn from the power input terminal of the circuit breaker 100. Therefore, even when the circuit breaker 100 operates and is opened, the commercial AC power can be supplied.

As shown in FIG. 2, fuses 120 and F1 are installed between the power input terminal of the circuit breaker 100 and the DC type pulse generator 130. The fuse 120 is fused when excessive current flows to protect the circuit that is subsequently connected.

The commercial AC power is drawn in the forward direction through the diode D4 and the voltage is lowered in the resistor R1 to be applied to the DC type pulse generator 130. [ The DC pulsating current generator 130 includes a zener diode ZD1 and a capacitor C1 that are connected in parallel between the R phase line and the ground.

5 is a waveform diagram illustrating an output waveform of the DC pulsating current generator in the present invention. As shown in Fig. 5A, the zener diode ZD1 performs half-wave rectification of the AC power. Then, the capacitor C1 compensates the zero phase in the rectified phase to a predetermined positive phase to generate the DC type pulse wave, as shown in Fig. 5 (b). DC pulsating current waveform is connected to the first phase-division-lightning-warning LED 240 through the resistor R9.

The first temperature detection switch 220 detects the overheating of the first trunk line surge protective element 210 and is closed so that the trigger voltage is applied to the thyristor Q3 of the first switching circuit unit 230. [ When the thyristor Q3 is turned on, the waveform signal generated by the DC pulsator generating unit 130 constitutes a closed loop through the LED 240 for the first phase-separated lightning warning and the thyristor Q3. The thyristor Q3 is turned on by applying the DC pulsating current in the DC pulsator generating unit 130 even if the first temperature detecting switch 220 is opened and the signal is blocked at the gate terminal of the thyristor Q3 State. Therefore, the LED 240 for the first phase-classified lightening warning keeps on the lighting state even after the lightning stroke is extinguished and the circuit breaker 110 performs the shutdown operation.

As shown in FIGS. 1 and 2, Schottky diodes SD1, SD2, and SD3 are connected to the lines drawn from the junctions between the resistors R3, R6, and R9 and the LEDs 440, 340, An intermediate reset switch 150 is connected. The Schottky diodes SD1, SD2 and SD3 flow a forward current at a high speed and bypass the output of the DC type pulse generator 130 directly to the ground side when the reset switch 150 is inputted. That is, when the reset switch 150 is inputted, the thyristors Q1, Q2 and Q3 are turned off only when the anode terminals of the thyristors Q1, Q2 and Q3 drop to zero potential.

The invention described above is susceptible to various modifications within the scope not impairing the basic idea. In other words, all of the above embodiments should be interpreted by way of example and not by way of limitation. Therefore, the scope of protection of the present invention should be determined in accordance with the appended claims rather than the above-described embodiments, and should be construed as falling within the scope of the present invention when the constituent elements defined in the appended claims are replaced by equivalents.

100: breaker 110: trip coil
120: Fuse 130: DC-type pulse generator
140: Power indicator LED 150: Reset switch
160: First lightning arrester 170: Second lightning arrester
210: first trunk line surge protection element 220: first temperature detection switch
230: first switching circuit part 240: LED for first phase lightning warning
310: second phase line surge protection element 320: second temperature detection switch
330: Second switching circuit part 340: Second phase lightning warning LED
410: Third phase line surge protecting element 420: Third temperature detecting switch
430: third switching circuit part 440: third phase lightning warning LED

Claims (7)

A surge protection device installed in a three-phase power line of R, S, and T to protect the power distribution system from lightning,
And a surge surge protective element (MOV1, SAV) which is provided between the neutral line and the receiving line at the rear end of the circuit breaker which cuts off the power supply to the load side in each of the R, S, MOV2, MOV3);
And a bimetallic switch disposed adjacent to each of the commercial surge protection devices MOV1, MOV2 and MOV3 and closing when the ambient temperature reaches a predetermined value, and corresponding to the commercial surge protection devices MOV1, MOV2 and MOV3 (B / R) connected to a trip coil for tripping the breaker, the other end of the temperature detection switch being connected to each of the three-phase receiving lines at the rear end of the circuit breaker, B / S, B / T);
Wherein a gate terminal is connected to each of the temperature detection switches B / R, B / S and B / T, and is turned on when the temperature detection switches B / R, B / S and B / (Q3, Q2, Q1);
A Zener diode (hereinafter, referred to as a Zener diode) which receives the commercial AC power from any one of the power lines of the R phase, the S phase, and the T phase power line, operates by receiving power from the transmission line at the front end of the circuit breaker, And a capacitor (C1) for smoothing the half-wave rectified phase to compensate a zero phase in a rectified phase to a predetermined positive phase, and generating a DC type pulsation to generate a thyristor (Q3) , Q2, and Q1 to the respective anode terminals;
LEDs (LED4, LED3), which are connected between the DC pulsator and each of the thyristors (Q3, Q2, Q1) and are lit when the thyristors (Q3, Q2, Q1) , LED2); And
A reset switch for bypassing the output of the DC pulsating current generator to the ground side to drop the anode terminal of the thyristor Q3, Q2, Q1 to zero potential,
Wherein the lightning protection device has a lightning line segment display function.
The method according to claim 1,
Further comprising a lightning arrester connected between the common line between the commercial line surge protection elements (MOV1, MOV2, MOV3) and the neutral line and ground.
The method according to claim 1,
And a fuse (F1) is further provided between the power input terminal of the breaker and the DC type pulse generating unit.
The method according to claim 1,
Schottky diodes (SD1, SD2, SD3) for rapidly bypassing the output of the DC pulsating current generator are installed between the power input terminals of the LEDs (LED4, LED3, LED2) Wherein the lightning strike line has a lightning strike line segment display function. delete delete delete

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