CN2520063Y - Thunder protector for electric net - Google Patents
Thunder protector for electric net Download PDFInfo
- Publication number
- CN2520063Y CN2520063Y CN 01271350 CN01271350U CN2520063Y CN 2520063 Y CN2520063 Y CN 2520063Y CN 01271350 CN01271350 CN 01271350 CN 01271350 U CN01271350 U CN 01271350U CN 2520063 Y CN2520063 Y CN 2520063Y
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- China
- Prior art keywords
- circuit
- overvoltage protection
- electrical network
- protection
- lightning protection
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- Expired - Lifetime
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- 230000001012 protector Effects 0.000 title 1
- 238000001514 detection method Methods 0.000 claims abstract description 13
- 230000005540 biological transmission Effects 0.000 claims abstract description 10
- 230000002093 peripheral effect Effects 0.000 claims description 2
- 238000011084 recovery Methods 0.000 description 6
- 230000000694 effects Effects 0.000 description 2
- 230000001681 protective effect Effects 0.000 description 2
- 239000000853 adhesive Substances 0.000 description 1
- 230000001070 adhesive effect Effects 0.000 description 1
- 230000032683 aging Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000011897 real-time detection Methods 0.000 description 1
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- Emergency Protection Circuit Devices (AREA)
Abstract
The utility model discloses a lightning protection device of power network, including a lightning protection circuit which is connected in parallel to power network transmission lines. The lightning protection device of power network is characterized in that a voltage detection circuit of power network, an overvoltage protection determining circuit and an overvoltage protection executive circuit are further included. The input terminal of the voltage detection circuit of power network is connected in parallel to the power network transmission lines, and the output terminal is connected to the input terminal of the overvoltage protection discriminate circuit, whereas the output terminal of the overvoltage protection determining circuit is connected to the control terminal of the overvoltage protection executive circuit which is connected in series to the firewire of the power network wires. Reference voltage of the overvoltage protection determining circuit is arranged on the overvoltage protection point of switch power, but lower than the protection point of the lightning protection device, thus even though the lightning protection device doesn't act, the devices (like switch power) connected with the power network still can be protected, and the connection between the switch power and the power network can recover automatically when voltage descends to a certain degree.
Description
Technical field:
The utility model relates to a kind of electrical network lightning protection device.
Background technology:
China is man of mountain country more than, and the thunder and lightning distributed areas are extensive, and thunderstorm day is more, and the safe operation of electric/electronic device is brought threat.Most equipment is all equipped surge protection device (SPD) in prime for this reason, and promptly the lightning protection device of saying has usually played good lightning protection effect to equipment.
General SPD device is made of components and parts such as piezo-resistance, gas discharge tube, air switches, can absorb thunder-strike current and switching overvoltage effectively.But because the special circumstances of China's electrical network, general lightning protection device can't play complete protective effect.The electrical network normal voltage of China is an alternating current 220V, but the voltage ripple of power network scope is very big, particularly in outlying mountain area, because the aging backwardness of generating equipment and electric line causes line voltage in 100V～320V even fluctuation in larger scope.When voltage ripple of power network is above to 300V, be extremely disadvantageous to the operation of electronic equipment.For switch power supply equipment; for preventing that high pressure from damaging; usually there is the input over-voltage protecting function its inside; but this function has only stopped the output of Switching Power Supply to back level subscriber equipment power supply; but to switch power supply equipment itself; the input high pressure still is added on its more inner devices, and usually more inner auxiliary circuits are still in work.This input high pressure constitutes a threat to the operation of switch power supply equipment, constantly has input voltage too high and case that damage Switching Power Supply takes place.And this moment, general lightning protection device was (over-voltage protection point of lightning protection device is usually at least more than 385Vac) that does not have the protection action.
Summary of the invention:
The purpose of this utility model is exactly in order to overcome the above problems; a kind of electrical network lightning protection device is provided; equipment on the electrical network (especially switch power supply equipment) constituted a threat to because of voltage is elevated at electrical network and not reach lightning protection device when action as yet; can in time cut off connecting of Switching Power Supply and electrical network, reach the purpose of protection switch power supply and follow-up equipment better.
The utility model realizes that the scheme of above-mentioned purpose is: a kind of electrical network lightning protection device, comprise lightning protection circuit, it is parallel on the grid power transmission line, it is characterized in that: also include network voltage detection circuit, overvoltage protection judging circuit and overvoltage protection executive circuit, described network voltage detection circuit input end is parallel on the grid power transmission line, output links to each other with the input of overvoltage protection judging circuit, and the output of overvoltage protection judging circuit then links to each other with the control end of overvoltage protection executive circuit; The overvoltage protection executive circuit is series on the live wire of electrical network electric wire.
Adopt the beneficial effect of above scheme: owing to outside lightning protection device, increased network voltage detection circuit, overvoltage protection judging circuit and overvoltage protection executive circuit again; the reference voltage of overvoltage protection judging circuit can be set on the over-voltage protection point of Switching Power Supply; and be lower than the protection point of lightning protection device; like this; even lightning protection device does not move; still can play being associated in the protective effect of the equipment (as Switching Power Supply) on the electrical network, and the connection that can when voltage drops to a certain degree, recover Switching Power Supply and electrical network automatically.
Description of drawings:
Fig. 1 is the utility model embodiment schematic diagram.
Embodiment:
Below by specific embodiment and in conjunction with the accompanying drawings to the description in further detail of the utility model do.
As Fig. 1, this electrical network lightning protection device comprises lightning protection circuit (1), and network voltage detection circuit, overvoltage protection judging circuit and overvoltage protection executive circuit.Described lightning protection circuit (1) is parallel on the grid power transmission line; Described network voltage detection circuit input end is parallel on the grid power transmission line, and output links to each other with the input of overvoltage protection judging circuit, and the output of overvoltage protection judging circuit then links to each other with the control end of overvoltage protection executive circuit; The overvoltage protection executive circuit is series on the live wire of electrical network electric wire.
Described network voltage detection circuit comprises rectification circuit and divider resistance (R), and the input of described rectification circuit is parallel on the grid power transmission line, and output is pressed the protection judging circuit on one side through divider resistance (R) ground connection Yi Bian take over.
Described overvoltage protection judging circuit comprises comparator (U1) and peripheral circuit thereof; two inputs of described comparator (U1) one (among Fig. 1 being+end) connect reference voltage (Vref); the output of another voltage detecting circuit that gets access to grid, its output are taken over and are pressed the protection executive circuit.The anode of comparator (U1) is also received output by resistance (R2), and this resistance (R2) is used to be provided with recovery point.
Described overvoltage protection executive circuit comprises triode (Q) and relay or contactor; the base stage of described triode (Q) is taken over the output of pressing the protection judging circuit; emitter is succeeded the control end of electrical equipment or contactor, and relay or contactor then are series on the live wire of electrical network electric wire.
Basic principle principle of the present utility model is to increase the network voltage detection circuit in lightning protection device; real-time detection of grid voltage, when line voltage reaches over-voltage protection point, the overvoltage crowbar action; the contact of control relay or contactor disconnects, and cuts off the power supply to the user.When line voltage dropped to certain value (overvoltage recovery point), testing circuit control relay or contactor closure were recovered the power supply to the user automatically.
Input over-voltage protection point and overvoltage recovery point can obtain the needed value of user by the parameter that is provided with in the network voltage detection circuit.According to practical experience; over-voltage protection point is located at 300Vac ± 5Vac (can be provided with by resistance R among Fig. 1) usually; and the overvoltage recovery point is 280Vac ± 5Vac (can by Fig. 1 in resistance R 2 be provided with); just at line voltage during in the 300Vac left and right sides; Fig. 1 repeat circuit contact is with automatic disconnection; when voltage drops to the 280Vac left and right sides, the automatic adhesive in Fig. 1 repeat circuit contact, thus recovery is to the power supply of subscriber equipment.
Lightning protection circuit, still the same with traditional lightning protection device, constitute by components and parts such as piezo-resistance, gas discharge tube, air switches.
Its operation principle is as follows: as shown in Figure 1, voltage sample is obtained by electric resistance partial pressure after rectification, gives comparator (U1) again, adjusts the size of resistance (R), can adjust over-voltage protection point.When comparator anode sampled voltage during greater than the reference voltage V ref of negative terminal, comparator upset, output high level; and cause triode (Q) to end, and the control coil of relay loses voltage, and relay contact disconnects; thereby cut off power supply, played the effect of input overvoltage protection subscriber equipment.Equally, after line voltage drops to recovery point, comparator (U1) upset, output low level, triode (Q) conducting, the control coil of relay obtains electric current, thus relay contact closure recovers the power supply to subscriber equipment.
Among Fig. 1, the AC-DC voltage changer is mainly comparator power supply (VCC) and reference voltage (Vref) is provided, and provides operating voltage for relay control coil simultaneously.
Scheme provided by the invention promptly has the lightning protection function of traditional lightning protection device, can prevent to cause because of line voltage is too high the damage of subscriber equipment again.This programme is tried out on one of our company experiment lightning protection box, and practical probation proves, switch power supply equipment is because after using this lightning protection box, has stopped the too high and accident of damage equipment of line voltage.
Claims (5)
1. electrical network lightning protection device, comprise lightning protection circuit (1), it is parallel on the grid power transmission line, it is characterized in that: also include network voltage detection circuit, overvoltage protection judging circuit and overvoltage protection executive circuit, described network voltage detection circuit input end is parallel on the grid power transmission line, output links to each other with the input of overvoltage protection judging circuit, and the output of overvoltage protection judging circuit then links to each other with the control end of overvoltage protection executive circuit; The overvoltage protection executive circuit is series on the live wire of electrical network electric wire.
2. electrical network lightning protection device as claimed in claim 1; it is characterized in that: described network voltage detection circuit comprises rectification circuit and divider resistance (R); the input of described rectification circuit is parallel on the grid power transmission line; output is pressed the protection judging circuit on one side through divider resistance (R) ground connection Yi Bian take over.
3. electrical network lightning protection device as claimed in claim 1 or 2; it is characterized in that: described overvoltage protection judging circuit comprises comparator (U1) and peripheral circuit thereof; one of two input of described comparator (U1) connect reference voltage (Vref); the output of another voltage detecting circuit that gets access to grid, its output are taken over and are pressed the protection executive circuit.
4. electrical network lightning protection device as claimed in claim 1 or 2; it is characterized in that: described overvoltage protection executive circuit comprises triode (Q) and relay or contactor; the base stage of described triode (Q) is taken over the output of pressing the protection judging circuit; emitter is succeeded the control end of electrical equipment or contactor, and relay or contactor then are series on the live wire of electrical network electric wire.
5. electrical network lightning protection device as claimed in claim 3; it is characterized in that: described overvoltage protection executive circuit comprises triode (Q) and relay or contactor; the base stage of described triode (Q) is taken over the output of pressing the protection judging circuit; emitter is succeeded the control end of electrical equipment or contactor, and relay or contactor then are series on the live wire of electrical network electric wire.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 01271350 CN2520063Y (en) | 2001-12-22 | 2001-12-22 | Thunder protector for electric net |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 01271350 CN2520063Y (en) | 2001-12-22 | 2001-12-22 | Thunder protector for electric net |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2520063Y true CN2520063Y (en) | 2002-11-06 |
Family
ID=33676809
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 01271350 Expired - Lifetime CN2520063Y (en) | 2001-12-22 | 2001-12-22 | Thunder protector for electric net |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2520063Y (en) |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102623962A (en) * | 2011-01-30 | 2012-08-01 | 深圳市航嘉驰源电气股份有限公司 | Adaptive lightning-protection surge-protection control circuit |
| CN101764389B (en) * | 2009-12-15 | 2012-09-12 | 河南省电力公司洛阳供电公司 | Anti-overvoltage measurement and control system and method |
| CN101728813B (en) * | 2008-10-23 | 2013-10-16 | 西门子公司 | Overvoltage protection method in system connected with power supply network, overvoltage protective apparatus and equipment provided with the overvoltage protective apparatus |
| CN103368395A (en) * | 2013-07-22 | 2013-10-23 | 成都联腾动力控制技术有限公司 | Electric protective device for electric automobile |
| CN108683159A (en) * | 2018-04-27 | 2018-10-19 | 东莞市熠源电子科技有限公司 | The power supply protection circuit and its control method of anti-abrupt voltage wave |
| CN110011291A (en) * | 2019-05-14 | 2019-07-12 | 云南电网有限责任公司电力科学研究院 | A kind of excess voltage protection |
-
2001
- 2001-12-22 CN CN 01271350 patent/CN2520063Y/en not_active Expired - Lifetime
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101728813B (en) * | 2008-10-23 | 2013-10-16 | 西门子公司 | Overvoltage protection method in system connected with power supply network, overvoltage protective apparatus and equipment provided with the overvoltage protective apparatus |
| CN101764389B (en) * | 2009-12-15 | 2012-09-12 | 河南省电力公司洛阳供电公司 | Anti-overvoltage measurement and control system and method |
| CN102623962A (en) * | 2011-01-30 | 2012-08-01 | 深圳市航嘉驰源电气股份有限公司 | Adaptive lightning-protection surge-protection control circuit |
| CN102623962B (en) * | 2011-01-30 | 2015-03-25 | 深圳市航嘉驰源电气股份有限公司 | Adaptive lightning-protection surge-protection control circuit |
| CN103368395A (en) * | 2013-07-22 | 2013-10-23 | 成都联腾动力控制技术有限公司 | Electric protective device for electric automobile |
| CN103368395B (en) * | 2013-07-22 | 2016-01-20 | 成都联腾动力控制技术有限公司 | For the electric protective device of electric automobile |
| CN108683159A (en) * | 2018-04-27 | 2018-10-19 | 东莞市熠源电子科技有限公司 | The power supply protection circuit and its control method of anti-abrupt voltage wave |
| CN110011291A (en) * | 2019-05-14 | 2019-07-12 | 云南电网有限责任公司电力科学研究院 | A kind of excess voltage protection |
| CN110011291B (en) * | 2019-05-14 | 2021-06-18 | 云南电网有限责任公司电力科学研究院 | Overvoltage protection circuit |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C56 | Change in the name or address of the patentee |
Owner name: NO. 1, KEJIGONGYEYUANKEFA ROAD, NANSHAN DISTRICT, Free format text: FORMER NAME OR ADDRESS: HOUSE 1, HUADIAN FACTORY SUITE, BANXUEGANGGONGYE DISTRICT, LONGGANG DISTRICT, SHENZHEN CITY, GUANGDONG PROVINCE, 518129, HOUSE 3 |
|
| CP03 | Change of name, title or address |
Patentee address after: 518057 No. 1, FA Lu, Nanshan District science and Technology Industrial Park, Guangdong, Shenzhen Patentee address before: 518129, Shenzhen, Guangdong province Longgang District snow Gang Industrial Zone Huadian building on the first floor, third floor |
|
| C17 | Cessation of patent right | ||
| CX01 | Expiry of patent term |
Expiration termination date: 20111222 Granted publication date: 20021106 |