CN101159378A - Transformer and lightning protection method and device for power supply circuit - Google Patents
Transformer and lightning protection method and device for power supply circuit Download PDFInfo
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- CN101159378A CN101159378A CNA2007100354595A CN200710035459A CN101159378A CN 101159378 A CN101159378 A CN 101159378A CN A2007100354595 A CNA2007100354595 A CN A2007100354595A CN 200710035459 A CN200710035459 A CN 200710035459A CN 101159378 A CN101159378 A CN 101159378A
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- transformer
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- neutral line
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Abstract
The invention discloses a lightening proof method and a device for a transformer and a power supply line. The lightening proof method lies in that inductance filters between the neutral line and the earthing line of the transformer are connected in series. The device comprises the transformer neutral line and the inductance filters; wherein, the inductance filters are connected in series between the neutral line and the earthing line of the transformer. The method and the device are capable of cutting off or inhibiting lightning current into underground through the neutral line of the transformer or to the transmission line so that the transformer low-voltage end winding is free from generating current, the high inductance voltage is eliminated and the lightning breakdown transformer fault is fully eliminated. Meanwhile, the method and the device also cut off the spreading path that the lightening current enters into the ground through the high voltage side arrester and then enters into the low voltage side through the neutral line from the ground, and fully eliminate the fault of the low voltage side use equipment caused by the lightening breakdown inductance of the high voltage side equipment.
Description
Technical field
The invention belongs to transformer and supply line shocking preventing technology field, the particularly lightening arresting method of transformer and supply line and device.
Background technology
The protection of power supply system is the assurance of power supply quality.Because generating equipment in the supply network, power consumption equipment becomes increasingly complex and huge, transmission line is more and more longer, and various interference components are also more and more, and terrestrial climate is also more and more changeable; Simultaneously, the use of a large amount of computing equipment, memory device, communication equipment requires also more and more higher to power quality.Traditional protection can not have been satisfied the needs of these development.
Power supply is of low quality to have two to show more significantly: the one, and lightning surge voltage enters power electronic equipment by the high and low pressure transmission line, causes power consumption equipment to damage; The 2nd, puncture transformer.
At present; the main traditional approach of transformer lightning protection is installed lightning conducter exactly on transmission line, and adopt method that high and low end at transformer installs high and low pressure Surge Protector (lightning arrester) additional to prevent direct stroke and reduce forceful electric power magnetic induction, the method for letting out the inflow place by Surge Protector reduces surge voltage intensity on the circuit.Find that by a large amount of investigation traditional mode can not realize good lightning surge voltage protection on the low voltage power transmission circuit, thunderbolt becomes power consumption equipment, network damages cause faults.
The reason that causes low voltage power transmission circuit surge voltage to enter power consumption equipment:
1, low-voltage circuit is owing to forceful electric power magnetic induction produces induced potential, in the circuit of low voltage power transmission simultaneously protective device such as Surge Protector be not enough to absorb its energy or, suppress its propagation;
2, high-tension line is owing to forceful electric power magnetic induction produces induced potential, and can puncture transformer enters low-voltage circuit to this induced potential on the one hand; The current potential that improves ground network when on the other hand, passing through the earth connection earial drainage in the Surge Protector protection process of high-pressure side passes through the neutral line simultaneously (at Y/Y
0And Y
0/ Y
0In the transformer-supplied mode, the earth connection of neutral earthing line and high-pressure side Surge Protector connects same ground network) with entering low-voltage circuit.
Concrete lightning surge voltage enters the reason of low voltage power transmission circuit need be determined according to the place of forceful electric power magnetic induction and the transmission range of circuit, and as a rule, because the service radius of transformer is limited, most applications should be due to second kind of reason.
The reason that causes distribution transformer to damage, the one, lightning current punch through damage step-up side lightning protection device or fuse.This failure cause is that the lightning arrester through-current capacity is too small, and thunder and lightning is strong excessively.Can solve by the bigger lightning protection device of replacing through-current capacity, the fuse that the through-current capacity specification is bigger; The 2nd, lightning current punch through damage transformer high-voltage end-coil (winding).Be that our common transformer damages, its reason mainly is that the caused corresponding winding overvoltage of lightning wave intrusion Transformer Winding causes.
Summary of the invention
At the shortcoming that prior art exists, the purpose of this invention is to provide the lightening arresting method and the device of a kind of transformer and supply line.This method and device can cut off or suppress lightning current goes into ground or enters transmission line by the transformer neutral line, makes the step-down side winding not produce electric current and eliminates the high induction voltage of high-pressure side, eliminates thunderbolt fully and punctures transformer fault.Simultaneously, also cut off lightning current and entered the earth, entered the propagation ducts of low-pressure side by the earth by the neutral line again, eliminated the fault of low-pressure side power consumption equipment fully because of the thunderbolt of high-pressure side line influence by the high-pressure side lightning arrester.
In order to realize the foregoing invention purpose, the lightening arresting method of transformer provided by the invention and supply line is: series inductance filter between the neutral line of transformer and ground wire.
Adopt the device of above-mentioned lightening arresting method to be: to comprise the neutral line, the inductance filter of transformer, series inductance filter between the neutral line of transformer and ground wire.
Described method and device are adapted to Y/Y
0And Y
0/ Y
0Transmission system.
Operation principle:
Under the normal operating conditions of no lightning surge electric current; the resistance value of inductance filter is very low; be short-circuit condition; guaranteeing the AC power frequency electric current, for interchange provides unimpeded short-circuit protection circuit (being excellent protection ground connection passage) and the work reference point (being good operation ground connection passage) of zero potential is provided for ac power supply system with the passage that forms zero impedance between greatly.
When the current potential of ground network sharply rises because of thunderbolt causes the high-pressure side Surge Protector to puncture, inductance filter forms the high impedance of lightning current frequency band with the sync response waveform, cut off surge voltage to the low-pressure side propagation path, stop it to propagate to the low pressure transmission line by exchanging neutral point; After the current potential of ground network descended, inductance filter was with the sync response waveform, the short-circuit condition under returning to normal.
Equally, when low-pressure end line influence lightning surge voltage, inductance filter also forms the high impedance of lightning current frequency band with the sync response waveform, lightning current is formed high impedance, surge voltage is opened circuit, stop it by exchanging neutral point, prevented to produce exciting current and respond to high pressure at the high pressure winding at the low pressure winding to transformer place ground network earial drainage.
In the whole protecting process, " neutral earthing inductance filter " blocked the propagation of high-frequency current at the transformer neutral line, and suppress high-pressure side and produced high voltage, thus effective, safe, prevented the puncture of transformer reliably.
The present invention compares with traditional technology solution, has following advantage:
1, cut off from the transmission of the lightning surge voltage of high-pressure side, improved the power supply quality, eliminated the damage of the power consumption equipment that most thunderbolts cause to the low voltage power transmission circuit;
2, cut off because of the superpotential surge current propagation ducts of Transformer Winding that high-pressure side is struck by lightning and the low-pressure end thunderbolt causes, eliminated the root that transformer damages fully;
Therefore 3, grounding system resistance can relax requirement, does not need the bigger construction investment first time and maintenance from now on to invest, the useful life that does not also need to use chemicals such as resistance reducing agent to improve grounding system;
4, device is installed simply, is safeguarded the aspect, and the bigger grounding resistance area requirement and the use of passive device are grounded the non-maintaining of system fully.
Further specify technical scheme of the present invention below in conjunction with accompanying drawing.
Description of drawings
Fig. 1 is the composition schematic diagram of apparatus of the present invention.
Fig. 2 is the circuit diagram of inductance filter in apparatus of the present invention.
Embodiment
For Y/Y
0, Y
0/ Y
0Transmission system, the lightening arresting method of transformer and supply line is: series inductance filter between the neutral line of transformer and ground wire.
As shown in Figure 1, adopt the device of above-mentioned transformer and supply line's lightening arresting method, comprise the neutral line 4, the inductance filter 6 of transformer 1, series inductance filter 6 between the neutral line 4 of transformer 1 and earth connection (joint grounding net) 5.Among the figure, there is lightning arrester 2 transformer 1 high-pressure side, and transformer case 3, the neutral line 4 adopt same earth connection (joint grounding net) 5.
The circuit diagram of inductance filter is made up of inductance coil L, coil resistance R and capacitor C (distributed capacitance or for adjusting the electric capacity that centre frequency, bandwidth increase) as shown in Figure 2.
The major parameter of inductance filter:
Center cut-off frequency: 10KHZ;
Frequency band: 4KHZ-100KHZ;
Withstand voltage: the withstand voltage of 〉=high-pressure side lightning arrester (determining) according to different transmission voltage grades;
Working frequency range: 0-2.0GHZ;
Maximum short circuit current: the power supply capacity (the perhaps maximum short circuit current of supply line) according to transformer selects-and be the selection (selection principle with transformer neutral line sectional area is identical) of the sectional area of inductance coil.
The selection foundation of cut-off frequency: the resonance centre frequency is 10KHZ, its spectral characteristic such as following:
1. lightning current mainly is distributed in low frequency part, and successively decreases along with the rising of frequency.When wave rear was identical, the steep more high order harmonic component of wavefront was abundant more.Under the identical situation of wavefront, the long more low frequency of wave rear portion is abundant more;
2. the energy of thunder and lightning mainly concentrates on low frequency part, and it is below the 10kHz in frequency that about thunder and lightning energy more than 90% divides by cloth.This has illustrated in information system, scurries into the lightning wave of lower frequency as long as prevent 10kHz, just can subdue the lightning wave energy more than 90%.
Claims (2)
1. the lightening arresting method of transformer and supply line is characterized in that series inductance filter between the neutral line of transformer and ground wire.
2. the lightning protection device of transformer and supply line is characterized in that comprising the neutral line, the inductance filter of transformer, series inductance filter between the neutral line of transformer and ground wire.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2007100354595A CN101159378A (en) | 2007-07-27 | 2007-07-27 | Transformer and lightning protection method and device for power supply circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2007100354595A CN101159378A (en) | 2007-07-27 | 2007-07-27 | Transformer and lightning protection method and device for power supply circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN101159378A true CN101159378A (en) | 2008-04-09 |
Family
ID=39307351
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNA2007100354595A Pending CN101159378A (en) | 2007-07-27 | 2007-07-27 | Transformer and lightning protection method and device for power supply circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN101159378A (en) |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101552475B (en) * | 2008-12-25 | 2011-09-14 | 浙江电力变压器有限公司 | Device for obtaining low voltage power supply from high voltage line |
| CN103390889A (en) * | 2012-05-10 | 2013-11-13 | 深圳远征技术有限公司 | Lightning protection device |
| CN108448553A (en) * | 2017-02-16 | 2018-08-24 | 维谛技术有限公司 | A kind of converter cabinet lightning-protection system and converter cabinet |
| CN108879628A (en) * | 2018-06-25 | 2018-11-23 | 广西电网有限责任公司电力科学研究院 | A kind of distribution transformer lightning protection mode of connection based on inductance filter |
| CN110137907A (en) * | 2019-05-29 | 2019-08-16 | 广西电网有限责任公司电力科学研究院 | A kind of inhibition over-voltage protector suitable for 10kV distribution transformer |
| CN113782321A (en) * | 2021-09-26 | 2021-12-10 | 云南电网有限责任公司红河供电局 | Method and device for restraining forward and reverse transformation overvoltage of distribution transformer |
-
2007
- 2007-07-27 CN CNA2007100354595A patent/CN101159378A/en active Pending
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101552475B (en) * | 2008-12-25 | 2011-09-14 | 浙江电力变压器有限公司 | Device for obtaining low voltage power supply from high voltage line |
| CN103390889A (en) * | 2012-05-10 | 2013-11-13 | 深圳远征技术有限公司 | Lightning protection device |
| CN108448553A (en) * | 2017-02-16 | 2018-08-24 | 维谛技术有限公司 | A kind of converter cabinet lightning-protection system and converter cabinet |
| CN108879628A (en) * | 2018-06-25 | 2018-11-23 | 广西电网有限责任公司电力科学研究院 | A kind of distribution transformer lightning protection mode of connection based on inductance filter |
| CN110137907A (en) * | 2019-05-29 | 2019-08-16 | 广西电网有限责任公司电力科学研究院 | A kind of inhibition over-voltage protector suitable for 10kV distribution transformer |
| CN113782321A (en) * | 2021-09-26 | 2021-12-10 | 云南电网有限责任公司红河供电局 | Method and device for restraining forward and reverse transformation overvoltage of distribution transformer |
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| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
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| C02 | Deemed withdrawal of patent application after publication (patent law 2001) | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Open date: 20080409 |