CN1177397C - Lightning protector for low voltage electric equipment - Google Patents
Lightning protector for low voltage electric equipment Download PDFInfo
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- CN1177397C CN1177397C CNB011278749A CN01127874A CN1177397C CN 1177397 C CN1177397 C CN 1177397C CN B011278749 A CNB011278749 A CN B011278749A CN 01127874 A CN01127874 A CN 01127874A CN 1177397 C CN1177397 C CN 1177397C
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- resistance
- piezo
- lightning protection
- lightning
- phase line
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Abstract
The present invention relates to a lightning protector for low voltage electric equipment, which mainly comprises a common mode lightning protective circuit, overcurrent protective equipment and lightning protective warning indicating equipment which is composed of three lightning protective warning indicating circuits with the same structure. The present invention is characterized in that each lightning protective warning indicating circuit is composed of a current limiting resistor R and a luminous indicating circuit which is connected with the current limiting resistor R in series and is switched on in a single direction. Because in each lightning protective warning indicating circuit, the luminous indicating circuit which is switched on in the single direction is skillfully adopted to form each lightning protective warning indicating circuit, the present invention ensures that the loop current of each lightning protective warning indicating circuit only can circulate in the single direction, protects an indicating lamp of each lightning protective warning indicating circuit by that the indicating lamp is reliably extinguished along with the fusing condition of each overcurrent protector, and accurately reflects the switching condition of each overcurrent protector. Maintainers can unequivocally know the running state of the whole lightning protector for the convenience of timely maintenance. The present invention has the advantages of simple, flexible and skillful structural arrangement, and strong practicability.
Description
Technical field
The present invention relates to a kind of lightning protection device, especially for the lightning protection device of low voltage electrical equipment.
Background technology
In order to provide lightning protection to the low-voltage electric equipment, at present effective method is on the Alternating Current Power Supply line of equipment lightning protection device to be installed.The operation principle of existing lightning protection device mainly contains two kinds: a kind of is at zero line and three phase lines the lightning protection components and parts to be installed over the ground directly respectively; Another kind is the lightning protection components and parts to be installed at zero line between over the ground, and three phase lines are to zero line direct installation lightning arrester respectively.Before a kind of lightning protection device in use because the influence of earth resistance, when the lightning protection components and parts damaged, though its front is serially connected with fuse, this fuse was difficult for fusing, so the lightning protection components and parts will be blasted or burn.A kind of lightning protection device in back is being done the time spent and since not zero line over the ground between the fuse of the suitable current capacity of serial connection before the lightning protection component, can cause fire to take place equally.A kind of lightning protection device is disclosed at the problems referred to above Chinese patent ZL98217538.8 (notification number CN2376112Y); it mainly is that to be connected to overcurrent protector before each piezo-resistance of lightning protection components and parts and gas discharge tube be fuse; and to be provided with overcurrent protector break-make indicating circuit be lightning protection alarm indicating circuit; but the lightning protection device of this structure has the imperfection part; for three-phase power supply system; because three-phase phase difference; after neutral line blown fuse; because of electric current can constitute the loop by diode between phase line; the phenomenon that causes indicator light not extinguish; and make user or attendant be difficult to the running status of clear and definite lightning protection device; provide wrong information to the attendant; think that the lightning protection device operation is normal; but in fact lightning protection device has lost the defencive function of common mode thunderbolt over the ground; equipment is under the unsafe condition that is struck by lightning, is difficult to guarantee the safe operation of communication equipment.
Summary of the invention
The purpose of this invention is to provide a kind of on the basis that guarantees the communication equipment safe operation, also has reliable failure indicating circuit, make the attendant can understand the lightning protector for low voltage electric equipment of the accurate operation conditions of device intuitively, this lightning protection device mainly comprises:
A common mode lightning protection circuit, form by three three piezo-resistance RV1, RV2, RV3 and gas discharge tube G1 that are connected across between neutral line N and the ground wire PE that are connected across respectively between three phase line L1, L2, L3 and the neutral line N, be used to improve the protection level of device;
An overcurrent protective device, be serially connected in phase line L1, the L2 of piezo-resistance RV1, RV2, RV3 front, overcurrent protector F1, F2, F3 on the L3 and the overcurrent protector F4 on neutral line N who is serially connected in gas discharge tube G1 front respectively by three and form, be used to prevent that the phenomenon of blast or burning from appearring in lightning protection components and parts such as piezo-resistance, gas discharge tube;
A lightning protection alarm indicating device is made up of three groups of identical lightning protection alarm indicating circuits of structure that are connected in parallel on respectively on piezo-resistance RV1, RV2, the RV3, is used to indicate the on off operating mode of overcurrent protector, makes the attendant understand the running status of device intuitively;
It is characterized in that: above-mentioned lightning protection alarm indicating circuit is respectively by a current-limiting resistance R1 or R2 or R3, the luminous indicating circuit of a unidirectional conducting of connecting with current-limiting resistance R1 or R2 or R3 is formed, the luminous indicating circuit of this unidirectional conducting comprises that serial connection is the diode D4 of one or indicator light LED1 or the LED2 or the LED3 of D5 or a D6 and a correspondence, wherein diode D4 or D5 or D6 positive terminal and resistance R 1 or R2 or R3 are connected, its negative pole end and indicator light LED1 or LED2 or LED3 are connected, the other end of indicator light LED1 or LED2 or LED3 is connected with neutral line N, and the other end of current-limiting resistance R1 or R2 or R3 is connected with a wherein phase line among phase line L1 or L2 or the L3 respectively.Wherein, it among the present invention the high reliability that further guarantees indicator light work, avoid indicator light because of burning out that variation causes, the luminous indicating circuit of above-mentioned unidirectional conducting also comprises the second diode D1 or a D2 or a D3 with LED 1 or LED2 or LED3 reverse parallel connection, wherein the second diode D1 or D2 or D3 and indicator light LED1 or LED2 or LED3 in parallel after, its negative pole end is connected with the negative pole of the first diode D4 or D5 or D6, and its positive terminal is connected with neutral line N.
For the neutral line N potential shift of avoiding causing because of remote countryside electrical network instability arrives high value, and the phenomenon of the blow-out work that influences gas discharge tube that occurs, be serially connected with a piezo-resistance RV7 between overcurrent protector F4 on the above-mentioned neutral line N and the gas discharge tube G1, and the short circuit point of above-mentioned each piezo-resistance RV1, RV2, RV3 is connected the tie point place of piezo-resistance RV7 and gas discharge tube G1; The short circuit point of above-mentioned three groups of lightning protection alarm indicating circuit is connected the tie point place of piezo-resistance RV7 and overcurrent protector F4.
For further reducing the alternate residual voltage of device, the present invention also includes the differential mode lightning protection circuit, this differential mode lightning protection circuit is made up of three wherein the piezo-resistance RV4 between two phase lines, RV5, RV6 that are connected across phase line L1, L2, L3 respectively, wherein piezo-resistance RV4 is connected across between phase line L1 and the L2, piezo-resistance RV5 is connected across between phase line L2 and the L3, and piezo-resistance RV6 is connected across between phase line L1 and the L3.
The present invention is owing to adopt the luminous indicating circuit of unidirectional conducting to form lightning protection alarm indicating circuit dexterously in each lightning protection alarm indicating circuit respectively, the loop current that both can effectively guarantee lightning protection alarm indicating circuit can only one-way flow, the indicator light that guarantees lightning protection alarm indicating circuit can extinguish reliably along with the fusing situation of each overcurrent protector, the break-make situation that reflects overcurrent protector exactly, make the attendant can clearly understand the running status of whole lightning protection device, be convenient to timely maintenance, preventing overcurrent protector fuses under hard pulse electric current or short circuit current, but the mistake indication owing to indicator light makes the attendant be negligent of the problem that lightning protection device is in time safeguarded, thereby effectively avoids protected equipment owing to lose the phenomenon that lightning protection is then smashed by continuous lightening pulse; The present invention simultaneously is again by sealing in piezo-resistance to play the effect of current-limiting resistance on the discharge tube between the neutral line and the ground, solution influences the problem of the blow-out work of gas discharge tube because of the rural power grids instability causes neutral line potential drifting to high value, the piezo-resistance that seals in both can play the effect of lightning protection, can play the effect that helps the gas discharge tube extinguish arcs again, and higher for the protective capacities of some withstand voltage low especially sensitive equipment.And the present invention also can select needs whether to increase the differential mode lightning protection circuit between each phase line according to the height of the alternate withstand voltage level of protected equipment to reduce residual voltage between phase line, and its structural arrangements is simple, flexible, ingenious, practical.
Describe basic composition of the present invention and operation principle in detail below in conjunction with drawings and Examples:
Description of drawings
Fig. 1 is that the present invention is installed in the structural representation in the access device;
Fig. 2 is the structural representation of pcb board of the present invention;
Fig. 3 is the electric principle schematic of the embodiment of the invention 1 embodiment;
Fig. 4 is the electric principle schematic of the further embodiment of the embodiment of the invention 1;
Fig. 5 is the electric principle schematic of the embodiment of the invention 1 another embodiment;
Fig. 6 is the electric principle schematic of the embodiment of the invention 2 embodiments;
Fig. 7 is the electric principle schematic of the further embodiment of the embodiment of the invention 2;
Fig. 8 is the electric principle schematic of the further embodiment of the present invention.
Embodiment
Embodiment 1
As Fig. 1-shown in Figure 5, present embodiment comprises
A common mode lightning protection circuit, form by three three piezo-resistance RV1, RV2, RV3 and gas discharge tube G1 that are connected across between neutral line N and the ground wire PE that are connected across respectively between three phase line L1, L2, L3 and the neutral line N, be used to improve the protection level of device;
An overcurrent protective device, being serially connected in phase line L1, the L2 of piezo-resistance RV1, RV2, RV3 front, overcurrent protector F1, F2, F3 on the L3 and the overcurrent protector F4 on neutral line N who is serially connected in gas discharge tube G1 front respectively by three forms, wherein said overcurrent protector F1, F2, F3, F4 adopt fuse, are used to prevent that the phenomenon of blast or burning from appearring in lightning protection components and parts such as piezo-resistance, gas discharge tube;
A lightning protection alarm indicating device is made up of three groups of identical lightning protection alarm indicating circuits of structure that are connected in parallel on respectively on piezo-resistance RV1, RV2, the RV3, is used to indicate the on off operating mode of overcurrent protector, makes the attendant understand the running status of device intuitively; As shown in Figure 3, above-mentioned lightning protection alarm indicating circuit is respectively by a current-limiting resistance R, the luminous indicating circuit of a unidirectional conducting of connecting with current-limiting resistance R is formed, the luminous indicating circuit of this unidirectional conducting comprises that serial connection is the diode D4 of one or indicator light LED1 or the LED2 or the LED3 of D5 or a D6 and a correspondence, wherein diode D4 or D5 or D6 positive terminal and resistance R 1 or R2 or R3 are connected, its negative pole end and indicator light LED1 or LED2 or LED3 are connected, the other end of indicator light LED1 or LED2 or LED3 is connected with neutral line N, and the other end of current-limiting resistance R1 or R2 or R3 is connected with a wherein phase line among phase line L1 or L2 or the L3 respectively.It among the present invention the high reliability that further guarantees indicator light work, avoid indicator light because of burning out that variation causes, as shown in Figure 4, the luminous indicating circuit of above-mentioned unidirectional conducting also comprises the second diode D1 or a D2 or a D3 with LED 1 or LED2 or LED3 reverse parallel connection, wherein the second diode D1 or D2 or D3 and indicator light LED1 or LED2 or LED3 in parallel after, its negative pole end is connected with the negative pole of the first diode D4 or D5 or D6, and its positive terminal is connected with neutral line N.
As Fig. 1～shown in Figure 2; be installed to easily in the claimed communication equipment for helping lightning protection device of the present invention; present embodiment also comprises a box body; be used for ccontaining PCD plate; wherein above-mentioned common mode lightning protection circuit; overcurrent protective device; lightning protection alarm indicating circuit is welded on the pcb board; and on this pcb board welding with described common mode lightning protection circuit arranged; overcurrent protective device; the binding post that lightning protection alarm indicating circuit etc. is connected; the position of corresponding its binding post is carved respectively and is equipped with groove between insulation on the pcb board in the wherein above-mentioned box body; be used to increase the electric arc creepage distance, realize the reliability service of high component density lower device.
Some connection leads are used to connect above-mentioned each electric components;
As shown in Figure 5; in the present embodiment; for further improving the reliability of lightning protection warning indicating device work; be serially connected with a piezo-resistance RV7 between overcurrent protector F4 on the above-mentioned neutral line N and the gas discharge tube G1; and the short circuit point of above-mentioned each piezo-resistance RV1, RV2, RV3 is connected the tie point place of piezo-resistance RV7 and gas discharge tube G1, and the short circuit point of three groups of lightning protection alarm indicating circuits is connected the tie point place of piezo-resistance RV7 and overcurrent protector F4.Be that the present invention mainly is by sealing in piezo-resistance RV7 to play the effect of current-limiting resistance on the discharge tube G1 between neutral line N and the ground wire PE, because some remote countryside electrical network instability, the current potential of neutral line N may be displaced to higher value, blow-out to gas discharge tube G1 causes certain influence, seal in piezo-resistance RV7 and both can play the lightning protection effect, can play the effect that helps gas discharge tube G1 extinguish arcs again; This circuit is higher for the protective capacities of the low especially sensitive equipment of some voltage endurance capability in addition.
Embodiment 2:
As Fig. 6-shown in Figure 7, the difference of present embodiment and embodiment 1 is that present embodiment is also to include the differential mode lightning protection circuit on the basis of embodiment 1, this differential mode lightning protection circuit is made up of three wherein the piezo-resistance RV4 between two phase lines, RV5, RV6 that are connected across phase line L1, L2, L3 respectively, wherein piezo-resistance RV4 is connected across between phase line L1 and the L2, piezo-resistance RV5 is connected across between phase line L2 and the L3, and piezo-resistance RV6 is connected across between phase line L1 and the L3.The main distinction of the function of present embodiment and embodiment 1 is the main piezo-resistance RV1 that relies among embodiment 1 and the embodiment 2; RV2; each phase line L1 is protected in the combination of RV3; L2; differential mode thunderbolt between the L3; promptly by RV1+RV2 protection L1; differential mode thunderbolt between L2; RV1+RV3 protects L1; differential mode thunderbolt between L3; RV2+RV3 protects L2; differential mode thunderbolt between L3; various embodiments with embodiment 1 are to play the simplification circuit like this; reduce cost; dwindle the effect of lightning protection device volume; adopt the present embodiment scheme that increases the differential mode lightning protection device then can greatly reduce the residual voltage of alternate lightning protection, improve protection level protected equipment.
In the present invention for further improving the ability of its thunder-strike current of releasing, further embodiment of the present invention can also be as shown in Figure 8, on each piezo-resistance RV, all be in series with gas discharge tube G, ability with its thunder-strike current of releasing of effective enhancing, two embodiment of front are three or four shared gas discharge tubes of piezo-resistance, but when electrical network is struck by lightning, three phase lines and a neutral line are invaded the lightning overvoltage ripple simultaneously often, lightning protection device action back impulse current is all from the gas discharge tube G ground of releasing, the pressure that gas discharge tube G bears is bigger, if thunderbolt intensity is very big, the nominal discharge current that might exceed gas discharge tube G, the guiding discharge pipe is impaired; The present embodiment all is connected in series discharge tube G on each piezo-resistance RV, the thunder-strike current of four lines is released by four paths respectively, alleviated the impact load of each discharge tube, but because the dispersiveness of gas discharge, delay (microsecond level) can be arranged the discharge time of every branch road slightly, cause and have certain differential mode overvoltage between line, therefore the present embodiment has also designed piezo-resistance RV5, RV6, RV7 comes this differential mode overvoltage is suppressed, guarantee the safety of power consumption equipment, wherein piezo-resistance RV5, RV6, RV7 is connected in parallel on three phase line L1 respectively, L2, between L3 and the neutral line N.
Claims (8)
1, a kind of lightning protector for low voltage electric equipment mainly comprises:
A common mode lightning protection circuit, form by three three piezo-resistances (RV1, RV2, RV3) and gas discharge tubes (G1) that are connected across between the neutral line (N) and the ground wire (PE) that are connected across respectively between three phase lines (L1, L2, L3) and the neutral line (N), be used to improve the protection level of device;
An overcurrent protective device, form by the overcurrent protector (F4) on the overcurrent protector (F1, F2, F3) on three phase lines (L1, L2, L3) that are serially connected in piezo-resistance (RV1, RV2, RV3) front respectively and the neutral line (N) that is serially connected in gas discharge tube (G1) front, be used to prevent that the phenomenon of blast or burning from appearring in lightning protection components and parts such as piezo-resistance, gas discharge tube;
A lightning protection alarm indicating device, form by three groups of identical lightning protection alarm indicating circuits of structure that are connected in parallel on respectively on the piezo-resistance (RV1, RV2, RV3), be used to indicate the on off operating mode of overcurrent protector, make the attendant understand the running status of device intuitively;
It is characterized in that: above-mentioned lightning protection alarm indicating circuit is respectively by a current-limiting resistance (R1 or R2 or R3), the luminous indicating circuit of a unidirectional conducting of connecting with current-limiting resistance (R1 or R2 or R3) is formed, the luminous indicating circuit of this unidirectional conducting comprises the indicator light (LED1 or LED2 or LED3) of serial connection for a diode (D4 or D5 or D6) of one and a correspondence, wherein diode (D4 or D5 or D6) positive terminal is connected with resistance (R1 or R2 or R3), its negative pole end is connected with indicator light (LED1 or LED2 or LED3), the other end of indicator light (LED1 or LED2 or LED3) is connected with the neutral line (N), and the other end of current-limiting resistance (R1 or R2 or R3) is connected with a wherein phase line in the phase line (L1 or L2 or L3) respectively.
2, low-voltage electric equipment lightning protection device according to claim 1, the luminous indicating circuit that it is characterized in that above-mentioned unidirectional conducting also comprises second diode (D1 or D2 or D3) with light-emitting diode (LED1 or LED2 or LED3) reverse parallel connection, wherein second diode (D1 or D2 or D3) is with after indicator light (LED1 or LED2 or LED3) is in parallel, its negative pole end is connected with the negative pole of first diode (D4 or D5 or D6), and its positive terminal is connected with the neutral line (N).
3, according to claim 1 or 2 described lightning protector for low voltage electric equipment, it is characterized in that being serially connected with a piezo-resistance (RV7) between overcurrent protector (F4) on the above-mentioned neutral line (N) and the gas discharge tube (G1), and the short circuit point of above-mentioned each piezo-resistance (RV1, RV2, RV3) is connected the tie point place of piezo-resistance (RV7) and gas discharge tube (G1); The short circuit point of above-mentioned three groups of lightning protection alarm indicating circuit is connected the tie point place of piezo-resistance (RV7) and overcurrent protector (F4).
4, according to claim 1 or 2 described lightning protector for low voltage electric equipment, it is characterized in that also including the differential mode lightning protection circuit, this differential mode lightning protection circuit is made up of three wherein piezo-resistances between two phase lines (RV4, RV5, RV6) that are connected across phase line (L1, L2, L3) respectively, wherein piezo-resistance (RV4) is connected across between phase line (L1) and the phase line (L2), piezo-resistance (RV5) is connected across between phase line (L2) and the phase line (L3), and piezo-resistance (RV6) is connected across between phase line (L1) and the phase line (L3).
5, according to the described lightning protector for low voltage electric equipment of claim 3, it is characterized in that also including the differential mode lightning protection circuit, this differential mode lightning protection circuit is made up of three wherein piezo-resistances between two phase lines (RV4, RV5, RV6) that are connected across phase line (L1, L2, L3) respectively, wherein piezo-resistance (RV4) is connected across between phase line (L1) and the phase line (L2), piezo-resistance (RV5) is connected across between phase line (L2) and the phase line (L3), and piezo-resistance (RV6) is connected across between phase line (L1) and the phase line (L3).
6,, it is characterized in that above-mentioned over-current protection device (F1, F2, F3, F4) is a fuse according to claim 1 or 2 described lightning protector for low voltage electric equipment.
7, according to claim 1 or 2 described low voltage electrical equipment lightning protection devices, it is characterized in that also comprising a box body, be used for ccontaining pcb board, wherein above-mentioned common mode lightning protection circuit, overcurrent protective device, lightning protection alarm indicating circuit are welded on the pcb board, and are welded with binding post on this pcb board;
Some connection leads are used to connect above-mentioned each electric components;
8, lightning protector for low voltage electric equipment according to claim 7, it is characterized in that carve respectively the position of corresponding wiring terminal on the pcb board in the above-mentioned box body is equipped with groove between insulation, be used to increase the electric arc creepage distance, realize the reliability service of high component density lower device.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB011278749A CN1177397C (en) | 2001-09-21 | 2001-09-21 | Lightning protector for low voltage electric equipment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB011278749A CN1177397C (en) | 2001-09-21 | 2001-09-21 | Lightning protector for low voltage electric equipment |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1339858A CN1339858A (en) | 2002-03-13 |
| CN1177397C true CN1177397C (en) | 2004-11-24 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB011278749A Expired - Lifetime CN1177397C (en) | 2001-09-21 | 2001-09-21 | Lightning protector for low voltage electric equipment |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1177397C (en) |
Families Citing this family (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2842663B1 (en) * | 2002-07-18 | 2004-09-10 | Schneider Electric Ind Sa | DEVICE FOR MONITORING NEUTRAL AND EARTH BREAKAGE, AND ELECTRICAL SWITCHING APPARATUS COMPRISING SUCH A DEVICE |
| CN100459359C (en) * | 2004-07-22 | 2009-02-04 | 艾默生网络能源有限公司 | Three-phase AC shockproof device for communication equipment |
| CN101752861A (en) * | 2009-12-21 | 2010-06-23 | 浙江恒丰光电技术有限公司 | Power source surge protector |
| CN201887464U (en) | 2010-11-22 | 2011-06-29 | 华为技术有限公司 | Lightning protection circuit and cabinet |
| CN102412573A (en) * | 2011-11-17 | 2012-04-11 | 台达电子企业管理（上海）有限公司 | High-power power supply equipment |
| CN103199516B (en) * | 2013-03-20 | 2016-01-27 | 华为技术有限公司 | A kind of interchange protection circuit and system thunder defending circuit |
| CN105958463B (en) * | 2016-06-22 | 2018-05-29 | 杭州能鸿电子科技有限公司 | Single-chip microcomputer-based lightning protection online detection integrated box and lightning protection detection method thereof |
| CN106487208B (en) * | 2016-11-28 | 2018-12-28 | 阳光电源股份有限公司 | The suppressing method and device of a kind of inverter ac cable common-mode voltage over the ground |
| CN111999680A (en) * | 2020-08-27 | 2020-11-27 | 国网电力科学研究院武汉南瑞有限责任公司 | Convenient detection method and device for direct-current fusing type lightning arrester |
-
2001
- 2001-09-21 CN CNB011278749A patent/CN1177397C/en not_active Expired - Lifetime
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| Publication number | Publication date |
|---|---|
| CN1339858A (en) | 2002-03-13 |
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Address after: 518057 Nanshan District science and Technology Industrial Park, Guangdong, Shenzhen Branch Road, No. Patentee after: Vitamin Technology Co., Ltd. Address before: 518057 Nanshan District science and Technology Industrial Park, Guangdong, Shenzhen Branch Road, No. Patentee before: Aimosheng Network Energy Source Co., Ltd. |
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Granted publication date: 20041124 |