KR20080084147A - Appratus for protecting surge for large capacity power - Google Patents

Appratus for protecting surge for large capacity power Download PDF

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Publication number
KR20080084147A
KR20080084147A KR1020070025448A KR20070025448A KR20080084147A KR 20080084147 A KR20080084147 A KR 20080084147A KR 1020070025448 A KR1020070025448 A KR 1020070025448A KR 20070025448 A KR20070025448 A KR 20070025448A KR 20080084147 A KR20080084147 A KR 20080084147A
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KR
South Korea
Prior art keywords
surge
varistor
fuse
capacity
protectors
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Application number
KR1020070025448A
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Korean (ko)
Inventor
엄주홍
Original Assignee
(재) 기초전력연구원
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Priority to KR1020070025448A priority Critical patent/KR20080084147A/en
Publication of KR20080084147A publication Critical patent/KR20080084147A/en

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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
    • G01R19/165—Indicating that current or voltage is either above or below a predetermined value or within or outside a predetermined range of values
    • G01R19/16566—Circuits and arrangements for comparing voltage or current with one or several thresholds and for indicating the result not covered by subgroups G01R19/16504, G01R19/16528, G01R19/16533
    • G01R19/16571—Circuits and arrangements for comparing voltage or current with one or several thresholds and for indicating the result not covered by subgroups G01R19/16504, G01R19/16528, G01R19/16533 comparing AC or DC current with one threshold, e.g. load current, over-current, surge current or fault current
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H85/00—Protective devices in which the current flows through a part of fusible material and this current is interrupted by displacement of the fusible material when this current becomes excessive
    • H01H85/02—Details
    • H01H85/04—Fuses, i.e. expendable parts of the protective device, e.g. cartridges
    • H01H85/041—Fuses, i.e. expendable parts of the protective device, e.g. cartridges characterised by the type
    • H01H85/048—Fuse resistors
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
    • H02H9/00—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection
    • H02H9/04—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection responsive to excess voltage
    • H02H9/044—Physical layout, materials not provided for elsewhere
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H85/00—Protective devices in which the current flows through a part of fusible material and this current is interrupted by displacement of the fusible material when this current becomes excessive
    • H01H85/02—Details
    • H01H85/04—Fuses, i.e. expendable parts of the protective device, e.g. cartridges
    • H01H85/041—Fuses, i.e. expendable parts of the protective device, e.g. cartridges characterised by the type
    • H01H85/048—Fuse resistors
    • H01H2085/0486—Fuse resistors with voltage dependent resistor, e.g. varistor

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Emergency Protection Circuit Devices (AREA)

Abstract

An apparatus for protecting surge for large capacity power is provided to improve a surge protection characteristic by connecting a plurality of surge protectors between power lines in parallel to separate a shorted varistor. An apparatus(100) for protecting surge for large capacity power includes a plurality of surge protectors(110). Each of the surge protectors has a varistor(112) and a surge fuse(114). One end of the varistor is connected to a bus(L1) of a power line. The surge fuse is connected between the other end of the varistor and a ground line(N) of the power line. The kind of varistor is a metal oxide varistor. Capacitances of the varistor and the surge fuse are determined based on the number of the surge protectors and capacitance of surge current flowing into the power line.

Description

Apparatus for protecting surge for large capacity power

1 shows a surge protector of the prior art;

2 is a view showing a schematic structure of a surge protection device for a large-capacity power supply according to an embodiment of the present invention.

Figure 3 is a view showing the response characteristics of the surge current for the surge protection device for a large-capacity power supply according to an embodiment of the present invention.

Figure 4 is a view showing the response characteristics of any one varistor short circuit failure for the surge protection device for a large-capacity power supply according to an embodiment of the present invention.

<Explanation of symbols for main parts of the drawings>

1: single varistor element 2: single surge fuse

100: surge protector 110: surge protector

112: varistor 114: surge fuse

116: short-circuit varistor 118: blown surge fuse

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a surge protection device for a large capacity power supply, and more particularly, to a surge protection device for a large capacity power supply that blocks a short circuit failure from surge voltage and surge current introduced into a circuit due to a lightning strike.

A conventional surge protector is used by mounting a single surge fuse 2 to a single varistor element 1 as shown in FIG. However, when it is used as a surge protector for a power supply of an unmanned base station or the like, since a protective operation cannot be performed when a surge occurs, there is a problem that a gap of the protective operation occurs until repair after failure.

SUMMARY OF THE INVENTION An object of the present invention is to provide a surge protection device for a large-capacity power supply which improves surge protection characteristics and safety performance by separating varistors having a short circuit failure by connecting a plurality of surge protectors composed of a varistor and a surge fuse in parallel between power lines. have.

In the surge protection device for a large-capacity power supply according to the present invention, a surge protection device comprising a plurality of surge protectors connected in parallel between power lines, the surge protector has a varistor having one end connected to a bus line of the power line and the other end of the varistor and a power source. And a surge fuse connected between the ground lines of the lines.

Preferably, the varistor is characterized in that the metal oxide varistor.

And preferably, the capacity of the varistor and the capacity of the surge fuse are calculated from the capacity of the surge current flowing into the power line and the number of the surge protectors.

The features and advantages of the present invention will become more apparent from the following detailed description based on the accompanying drawings. In the meantime, when it is determined that the detailed description of the known functions and configurations related to the present invention may unnecessarily obscure the subject matter of the present invention, it should be noted that the detailed description is omitted.

The surge protection device for a large-capacity power source according to an embodiment of the present invention will be described with reference to FIG. 2.

2 is a view showing a schematic structure of a surge protection device for a large-capacity power supply according to an embodiment of the present invention.

As shown in FIG. 2, the surge protection device 100 for a large-capacity power source includes a surge protector 110 including a varistor 112 and a surge fuse 114.

Varistor 112 is a metal oxide varistor (MOV), and is connected between the bus line (L1) and the ground line (N) which is a power line, and serves to protect the circuit from surge current.

The surge fuse 114 is connected between the varistor 112 and the ground line (N), and when the short circuit failure of the varistor, the surge fuse 114 is separated from the power circuit to perform a function for short-circuit protection.

Here, the surge protector 110, in which the varistor 112 and the surge fuse 114 are connected in series, is connected in parallel with a plurality (n) between the power supply lines (L1, N). In the present embodiment, the power line is a single-phase power line (L1, N), but the present invention is not limited thereto.

Surge fuses cannot withstand the surge capacity of 40kA and have a characteristic of being melted within a few seconds with an alternating current of about 10 to 30A. On the contrary, even if the fuse is melted within 3 seconds by a fault current of about 15A, the surge current capacity May not reach 20 kA.

The characteristics of these surge fuses are melt

Figure 112007020909742-PAT00001
This is because the maximum surge current capacity is calculated in consideration of the That is, to have a surge current capacity of 40 kA, the melting value
Figure 112007020909742-PAT00002
About 20,000
Figure 112007020909742-PAT00003
However, this capacity should be about 45A for 10 seconds.

Here, the response characteristic of the surge current according to an embodiment of the present invention is classified evenly in the surge protector 110 connected in parallel with a plurality (n) of the total surge current when the normal operation as shown in FIG. Flow.

In this case, as shown in FIG. 4, when the varistor 116 of the surge protector 110 has a short circuit failure, a normal protection operation is performed by the remaining surge protector even when the surge fuse 118 is blown due to the flow of a commercial frequency AC short circuit current. The safety performance is improved.

On the other hand, the capacity calculation of the varistor and the surge fuse according to an embodiment of the present invention will be described with reference to Table 1.

Since almost the same current is classified in each surge protector 110, the capacity of the varistor 112 is calculated by dividing the surge current capacity by the number of surge protectors 110.

The surge fuse capacity is measured from the surge current capacity table in Table 1.

Figure 112007020909742-PAT00004
Select the corresponding melt value
Figure 112007020909742-PAT00005
Divide by the number of surge protectors 110 to calculate the corresponding capacity.

That is, according to an embodiment of the present invention, the surge current capacity is 40kA, and in order to connect four surge protectors 110 between the power lines L1 and N, a surge fuse of 10kA or more varistor and 20kA surge current capacity is used. Connect in series.

In addition, the surge current capacity is 80kA, in order to connect the four surge protectors 110 between the power supply lines (L1, N), a varistor of 20kA or more and a surge fuse of 40kA surge current capacity are connected in series.

Figure 112007020909742-PAT00006

In addition, the surge current capacity is 120kA, and in order to connect four surge protectors 110 between the power lines L1 and N, a varistor of 30kA or more and a surge fuse of 60kA surge current capacity are connected in series.

As described above and described with reference to a preferred embodiment for illustrating the technical idea of the present invention, the present invention is not limited to the configuration and operation as shown and described as described above, it is a deviation from the scope of the technical idea It will be understood by those skilled in the art that many modifications and variations can be made to the invention without departing from the scope of the invention. Accordingly, all such suitable changes and modifications and equivalents should be considered to be within the scope of the present invention.

According to the present invention as described above, by connecting a plurality of surge protector consisting of a varistor and a surge fuse in parallel between the power supply line, it is possible to separate the varistor having a short circuit failure to improve the surge protection characteristics and safety performance.

Claims (3)

In the surge protection device consisting of a plurality of surge protector connected in parallel between the power line, The surge protector, And a surge fuse having one end connected to a bus bar of a power line and a second fuse connected between the other end of the varistor and a ground line of the power line. The method of claim 1, The varistor is, Surge protection device for large capacity power supply, characterized in that the metal oxide varistor. The method of claim 1, And a capacity of the varistor and a capacity of the surge fuse based on the capacity of the surge current flowing into the power line and the number of the surge protectors.
KR1020070025448A 2007-03-15 2007-03-15 Appratus for protecting surge for large capacity power KR20080084147A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
KR1020070025448A KR20080084147A (en) 2007-03-15 2007-03-15 Appratus for protecting surge for large capacity power

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
KR1020070025448A KR20080084147A (en) 2007-03-15 2007-03-15 Appratus for protecting surge for large capacity power

Publications (1)

Publication Number Publication Date
KR20080084147A true KR20080084147A (en) 2008-09-19

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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102456996A (en) * 2011-04-12 2012-05-16 厦门赛尔特电子有限公司 Lightning-protecting module for lightning-protecting socket
WO2012064729A2 (en) * 2010-11-08 2012-05-18 Shenzhen Dowin Lightning Technology, Co., Ltd. SURGE PROTECTION DEVICE USING METAL OXIDE VARISTORS (MOVs) AS THE ACTIVE ENERGY CONTROL MULTIPLE GAP DISCHARGING CHAIN
KR20120119594A (en) * 2011-04-22 2012-10-31 김호영 Protection device for electric or electronic operation equipment
KR101529584B1 (en) * 2011-02-08 2015-06-17 엘에스산전 주식회사 Surge protection device with pre-alarm function

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2012064729A2 (en) * 2010-11-08 2012-05-18 Shenzhen Dowin Lightning Technology, Co., Ltd. SURGE PROTECTION DEVICE USING METAL OXIDE VARISTORS (MOVs) AS THE ACTIVE ENERGY CONTROL MULTIPLE GAP DISCHARGING CHAIN
WO2012064729A3 (en) * 2010-11-08 2012-07-19 Shenzhen Dowin Lightning Technology, Co., Ltd. SURGE PROTECTION DEVICE USING METAL OXIDE VARISTORS (MOVs) AS THE ACTIVE ENERGY CONTROL MULTIPLE GAP DISCHARGING CHAIN
US8508326B2 (en) 2010-11-08 2013-08-13 Shenzhen Dowin Lighting Technologies Co., Ltd. Surge protection device using metal oxide varistors (MOVs) as the active energy control multiple gap discharging chain
KR101529584B1 (en) * 2011-02-08 2015-06-17 엘에스산전 주식회사 Surge protection device with pre-alarm function
CN102456996A (en) * 2011-04-12 2012-05-16 厦门赛尔特电子有限公司 Lightning-protecting module for lightning-protecting socket
KR20120119594A (en) * 2011-04-22 2012-10-31 김호영 Protection device for electric or electronic operation equipment

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