CN201181637Y - Lightning protection distribution transformer - Google Patents
Lightning protection distribution transformer Download PDFInfo
- Publication number
- CN201181637Y CN201181637Y CNU2008200630398U CN200820063039U CN201181637Y CN 201181637 Y CN201181637 Y CN 201181637Y CN U2008200630398 U CNU2008200630398 U CN U2008200630398U CN 200820063039 U CN200820063039 U CN 200820063039U CN 201181637 Y CN201181637 Y CN 201181637Y
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- lightning protection
- lightning
- transformer
- voltage
- parallel
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- 238000007599 discharging Methods 0.000 claims description 8
- 238000009413 insulation Methods 0.000 description 15
- 238000004804 winding Methods 0.000 description 13
- 230000001131 transforming effect Effects 0.000 description 11
- 230000009545 invasion Effects 0.000 description 10
- 239000010410 layer Substances 0.000 description 5
- XLOMVQKBTHCTTD-UHFFFAOYSA-N Zinc monoxide Chemical compound [Zn]=O XLOMVQKBTHCTTD-UHFFFAOYSA-N 0.000 description 4
- 239000011229 interlayer Substances 0.000 description 4
- APTZNLHMIGJTEW-UHFFFAOYSA-N pyraflufen-ethyl Chemical compound C1=C(Cl)C(OCC(=O)OCC)=CC(C=2C(=C(OC(F)F)N(C)N=2)Cl)=C1F APTZNLHMIGJTEW-UHFFFAOYSA-N 0.000 description 3
- 230000015556 catabolic process Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000006698 induction Effects 0.000 description 2
- 230000001681 protective effect Effects 0.000 description 2
- 229920002379 silicone rubber Polymers 0.000 description 2
- 239000011787 zinc oxide Substances 0.000 description 2
- 230000005540 biological transmission Effects 0.000 description 1
- 230000009977 dual effect Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 210000004907 gland Anatomy 0.000 description 1
- 239000012212 insulator Substances 0.000 description 1
- 239000003595 mist Substances 0.000 description 1
- 238000011056 performance test Methods 0.000 description 1
- 229910052573 porcelain Inorganic materials 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 150000003839 salts Chemical class 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
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Abstract
The utility model relates to a lightning protection substation transformator for solving the problem of insufficient protection capacity of the existing substation transformator to steepwave overvoltage. The high-voltage loops (1) of three phases of the substation transformator are respectively connected with one lightning arrester (2) in parallel; the high-voltage loop (1) of each phase is connected in parallel with the series circuit of a lightning protection trap (3) and one lightning arrester (2); the lightning protection trap (3) consists of an inductance L and a current-limiting resistor R connected in parallel; the branch of the current-limiting resistor R is provided with a discharging clearance K.
Description
Technical field:
It is relevant that the utility model is used for the lightning protection of distribution transformer.
Background technology:
In electric power system, 10KV and 35KV electrical network and distribution depressor (distribution transforming) be in occupation of extremely important status, and according to incomplete statistics at the year ends 2007, only there is about 3,000,000 kilometers of 10KV distribution line urban and urual areas of whole country, about 1,000 ten thousand of distribution transforming, nearly 900,000,000 kilovolt-amperes of distribution transforming total capacity.Distribution transforming is the line equipment of electric power system to the town and country power supply, is undertaking the vital task of directly serving for the user.
The distribution ground of distribution line is wide greatly, and the insulation level of circuit and equipment is far below ultra-high-tension power transmission line.At thunderstorm season, not only thunder and lightning is attacked the accident that distribution line (direct lightning strike) can cause circuit or equipment directly, and near the thunderbolt circuit during object, the frequent on the line induction thunder that produces also can cause the accident of circuit and equipment.
According to each geo-statistic damage to crops caused by thunder is the main cause that causes the power distribution network accident, and it is the lightning damage accident of distribution transformer that (15-50) % in the damage to crops caused by thunder accident, is arranged approximately.The lightning damage rate of distribution transforming generally is about (1-2) %, can reach 5% in heavy minefield, thunder and lightning day greater than 100 days the area in addition can reach (7.5-10) %.The damage of distribution transformer is directly produced to workers and peasants and the people's normal life causes great loss.Therefore, the damage to crops caused by thunder accident of minimizing distribution transformer is important measures that improve the power system power supply reliable rows.
The lightning protection of distribution transformer should comprise 2 aspect contents: the overvoltage protection of (1) main insulation, main purpose are the amplitudes of the lightning voltage of restriction invasion distribution transforming, and major measure is lightning arrester to distribution transforming to be installed.Reduce the overvoltage protection of the earth resistance and (2) Transformer Winding (circle/interlayer) of taking measures on customs clearance insulation; main purpose is to reduce the steepness of the lightning voltage of invasion distribution transforming; prevent that big steep wave overvoltage of wave head time very short (about 0.1-1.0 μ S), steepness from damaging the circle/layer insulation of transformer, but still do not have effective privacy protection equipment so far.
In the distribution transformer that the infringement of high pressure winding takes place; 93% has layer short circuit; due to the steep wave overvoltage: the main insulation protective ratio when promptly distribution transformer lightning protection mode is to invasion approximate test lightning wave is more effective; but, be the one of the main reasons that the distribution transforming rate of failure is difficult to reduce to steep wave overvoltage protection scarce capacity.
When suffering tetanic thunderbolt near the distribution transformer, the steep wave overvoltage can appear: in the thunder and lightning guide who forms the induction thunder overvoltage of discharging, head-on the guide discharges in overvoltage and the main discharge overvoltage three phases, head-on guide's normally steep wave overvoltage of high amplitude of overvoltage of discharging.The steep wave overvoltage mainly shows in the following areas the harm of distribution transformer;
A. owing to the inhomogeneous distribution of thunder and lightning steep wave in Transformer Winding, the steep wave overvoltage causes the circle/layer insulation of distribution transforming winding easily, the insulation damages between the high-low pressure winding;
B. the more difficult recovery of puncture under the standard wave that compares of the superpotential insulation breakdown of steep wave;
C. the discharge dispersity of discharging gap is big under the steep wave overvoltage, often causes the discharge of distribution transforming internal clearance.
The utility model content:
The purpose of this utility model provides a kind of simple in structure, the reliable lightning protection distribution transformer of lightning protection.
The utility model is achieved in that
The utility model lightning protection distribution transformer, the three-phase high-voltage coil 1 of transformer is respectively in parallel with a lightning arrester 2, it is characterized in that every phase high-tension coil 1 is in parallel with a lightning arrester 2 with the series circuit of a lightning protection trap 3, trap 3 is made of inductance L and current-limiting resistance R parallel connection, and the branch road of current-limiting resistance R has discharging gap K.
The three-phase low-voltage coil 4 of transformer is respectively in parallel with a lightning arrester 5.
Inductance L=250-350 μ H (microhenry), reflection coefficient＞1.8, wavefront prolongs multiple＞7, and the discharge voltage of discharging gap K is 35-42KV.
The utility model is simple in structure, and is with low cost, and protective value is good, both can reduce the superpotential steepness of steep wave of invading distribution transformer effectively; Also can significantly lower the lightning wave amplitude of invasion distribution transformer, be the new exclusive protection equipment that reduces distribution depressor accident, and product is through scene operation test, the consistent favorable comment that is subjected to.
Do not have under this 10KV-35KV lightning protection trap situation, when steep wave is crossed electric transformation invasion distribution depressor, even the zinc oxide arrester action of transformer inlet, on the circle/layer insulation of high pressure winding, still the approximately overvoltage of (50-60) % invasion wave amplitude can occur, cause circle/layer short circuit, internal clearance discharge and transformer to damage.So the necessary amplitude of invading ripple that further reduces needs to reduce the intrusion wave steepness simultaneously.
The utility model has 10KV-35KV lightning protection trap, when the steep wave overvoltage is invaded:
A. owing to the appropriate design of 10KV-35KV trap parameter, ripple returns before the lightning protection trap and penetrates in invading, and makes lightning arrester action in advance under lower voltage, thereby has reduced the amplitude of invading ripple;
B. after the inductance of steep wave by the lightning protection trap, its steepness of wave edge reduces greatly, makes be evenly distributed of overvoltage in winding portion, thereby reduces the circle/interlayer overvoltage of winding effectively, has avoided the insulation breakdown and the short circuit of winding turns/interlayer.
C. the flash-over characteristic under sloping wave head overvoltage is better than steep wave head flash-over characteristic owing to winding and lead-in wire gap, thereby effectively prevents the discharge accident of internal clearance and lead-in wire.
D. served as voltage magnitude when high especially, trap internal clearance K action, insert current-limiting resistance R further restriction be distributed in the overvoltage of Transformer Winding row.
When the wavefront time of invasion voltage wave 0.6/40 μ S is 0.6 μ S, behind the lightning protection trap, the wavefront time of the voltage on the transformer terminal becomes 4.5 μ S, be the wavefront time lengthening 7.5 times, steepness of wave edge is reduced to 1/7.5 of invasion wave steepness, thereby the overvoltage that has changed in the Transformer Winding distributes, and has reduced winding head end circle/interlayer overvoltage.
When the amplitude of invading voltage wave is 11.2KV.Produce reflection when this voltage via line wave impedance arrives the lightning protection trap, the voltage that acts on the lightning arrester terminal is raise be 20.8KV.1.9 times have been raise than invasion voltage.That is to say, compare when not adding the lightning protection trap that approximating lightning arrester 1/2 operation voltage time-base circuit lightning arrester at invasion voltage will move, thereby has reduced the voltage magnitude that acts on the transformer, make it avoid damaging.
The lightning protection trap has following characteristics:
Parameter designing is reasonable, to the transformer of various capacity and structure, all can effectively reduce the amplitude and the steepness of invading ripple, effectively protects transformer to avoid thunderbolt and damages.
Use special inductance, satisfy the protection requirement.
Effectively incorporate the overvoltage current-limiting function.
The dielectric strength height is not subjected to weather and external environment influence.
Description of drawings:
Fig. 1 is one of structure chart of the present utility model.
Fig. 2 is two of a structure chart of the present utility model.
Fig. 3 is circuit theory diagrams of the present utility model.
Fig. 4 is a lightning protection trap schematic diagram.
Embodiment:
10KV-35KV lightning protection trap major parameter:
1. rated operational voltage: 10KV-35KV
2. rated operational current: 30A-100A
3. Insulation Test (power frequency/impact): 42KV/75KV
4. steep wave and wave arrestment performance test: reflection coefficient:＞1.8,
5. wavefront prolongs multiple:＞7
6. discharging gap sparking voltage test: 35KV-42KV
The utility model is selected to indoor and outdoor, and the lightning protection trap is at sunshine, rain, mist, frost, snow and freeze, abominable situations such as atmospheric conditions such as salt fog, industrial pollution descend to realize desired function.
Ambient temperature :-40-60 ℃
Height above sea level is no more than: 3000m
Nominal operation frequency: 50Hz--60Hz
Rated operational voltage: 10KV--35KV
The utility model series sees Table 1
| Model | Rated voltage (KV) | Rated current (A) | Be suitable for capacity of distribution transform (KVA) |
| FZQ1-12/500 | 12 | 30 | ＜500 |
| FZQ1-12/800 | 12 | 48 | 800 |
| FZQ1-12/1250 | 12 | 75 | 1250 |
| FZQ1-12/1600 | 12 | 93 | 1600 |
| FZQ1-40.5/1600 | 40.5 | 27 | ＜1600 |
| FZQ1-40.5/2000 | 40.5 | 33 | 2000 |
Measure both end voltage with the universal instrument ohms range before the utility model is installed, should be approximately zero.
The utility model product has on the transformer to be installed and two kinds of mounting meanss of cross-arm.When being installed on the porcelain shell for transformer, need not use the silicon rubber insulation carriage; When on cross-arm, installing, use the silicon rubber insulation carriage, it is bolted on the cross-arm with M10.Dual mode must be connected in series to product between the high gland of lightning arrester, can not be connected to the lightning arrester outside (promptly can not be connected between high pressure insurance and the lightning arrester), and pigtail splice should connect reliably.
Claims (3)
1, lightning protection distribution transformer, each is in parallel with a lightning arrester (2) for the three-phase high-voltage coil (1) of transformer, it is characterized in that every phase high-tension coil (1) is in parallel with a lightning arrester (2) with the series circuit of a lightning protection trap (3), lightning protection trap (3) is made of inductance L and current-limiting resistance R parallel connection, and the branch road of current-limiting resistance R has discharging gap K.
2, lightning protection distribution transformer according to claim 1 is characterized in that the three-phase low-voltage coil (4) of transformer is respectively in parallel with a lightning arrester (5).
3, lightning protection distribution transformer according to claim 1, inductance L=250-350 μ the H that it is characterized in that the lightning protection trap of distribution transformer high-tension coil series connection, reflection coefficient＞1.8, wavefront prolongs multiple＞7, and the discharge voltage of discharging gap K is 35-42KV.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2008200630398U CN201181637Y (en) | 2008-04-18 | 2008-04-18 | Lightning protection distribution transformer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2008200630398U CN201181637Y (en) | 2008-04-18 | 2008-04-18 | Lightning protection distribution transformer |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201181637Y true CN201181637Y (en) | 2009-01-14 |
Family
ID=40251133
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNU2008200630398U Expired - Fee Related CN201181637Y (en) | 2008-04-18 | 2008-04-18 | Lightning protection distribution transformer |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201181637Y (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102801149A (en) * | 2012-08-14 | 2012-11-28 | 合肥南南电力保护设备有限公司 | Wire inlet protector |
| CN104064333A (en) * | 2014-06-06 | 2014-09-24 | 合肥鑫伟电力设备有限公司 | Outdoor anti-thunder transformer |
| CN107578901A (en) * | 2017-10-12 | 2018-01-12 | 深圳市创仕达电子有限公司 | A kind of transformer electromagnetic interference protecting system |
| 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 |
-
2008
- 2008-04-18 CN CNU2008200630398U patent/CN201181637Y/en not_active Expired - Fee Related
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102801149A (en) * | 2012-08-14 | 2012-11-28 | 合肥南南电力保护设备有限公司 | Wire inlet protector |
| CN104064333A (en) * | 2014-06-06 | 2014-09-24 | 合肥鑫伟电力设备有限公司 | Outdoor anti-thunder transformer |
| CN107578901A (en) * | 2017-10-12 | 2018-01-12 | 深圳市创仕达电子有限公司 | A kind of transformer electromagnetic interference protecting system |
| CN107578901B (en) * | 2017-10-12 | 2024-02-20 | 深圳市创仕达电子有限公司 | Transformer electromagnetic interference protection system |
| 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 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20090114 |