CN208423782U - A kind of distribution transformer lightning protection device based on inductance filter - Google Patents
A kind of distribution transformer lightning protection device based on inductance filter Download PDFInfo
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- CN208423782U CN208423782U CN201820982590.6U CN201820982590U CN208423782U CN 208423782 U CN208423782 U CN 208423782U CN 201820982590 U CN201820982590 U CN 201820982590U CN 208423782 U CN208423782 U CN 208423782U
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Abstract
The utility model discloses a kind of distribution transformer lightning protection device based on inductance filter, is related to anti-thunder technical field.The distribution transformer lightning protection device based on inductance filter, including high-pressure side arrester, low-pressure side arrester and inductance filter；One end of inductance filter is connect with the neutral point of distribution transformer low-pressure side; the other end is connect with distribution transformer metal shell; the impedance of inductance filter increases as the frequency for flowing through inductance filter electric current increases; it is in high-impedance state in lightning current effect; can effectively obstruct lightning stroke distribution transformer in the case of thunder and lightning flow through distribution transformer earthing net enter ground when; counterattack pours in the lightning current of distribution transformer low-pressure side neutral point; in power current effect, impedance very little, working earthing and the protective grounding to guarantee distribution transformer neutral point are normal simultaneously.
Description
Technical field
The utility model belongs to anti-thunder technical field more particularly to a kind of distribution transformer lightning protection based on inductance filter
Protective device.
Background technique
10kV distribution transformer is directly facing customer power supply in the power system, once damage, will result directly in user's confession
Electricity interrupts.Distribution network line distribution is wide, equipment is more, and most of distribution line does not set up lightning conducter based on overhead transmission line, by
Lightning strike probability is larger, especially distribution transformer, if thunder And Lightning Preventive Measures are inadequate or unreasonable, along lightning surge meeting
Road invades distribution transformer, generates positive and negative transformation overvoltage, causes transformer major insulation or turn-to-turn insulation to puncture and damage, influences
Power supply reliability.
China's 10kV distribution transformer mostly uses Y, Yn martingale.GB/T 50064-2014 " the mistake of alternating-current electric device
Voltage protection and Insulation Coordination design specification " in regulation, distribution transformer high-pressure side should close to transformer install arrester, low pressure
One group of arrester is preferably installed in side, and arrester ground line should connect together ground connection with transformer metal shell.
Even if being respectively arranged with arrester in distribution transformer high and low pressure side, and guarantee arrester ground line and transformer metal
Shell connects together ground connection, cannot still entirely prevent positive and negative transformation overvoltage.When lightning stroke distribution transformer, lightning arrestor movement,
Thunder and lightning flows through transformer grounding net and enters ground, increases grounded screen current potential greatly, generates overvoltage and through in step down side
Property line propagates at step down side neutral point, and then acts on low-voltage coil and low-voltage circuit.Low-voltage coil wave impedance
Much larger than low-voltage circuit, it will lead to voltage drop and concentrate on low-voltage coil substantially, even if step down side arrester is dynamic at this time
Make, residual voltage of arrester also will be present on low-voltage coil, and high pressure lateral coil is reached by electromagnetic induction, so that high-pressure side neutral point
Overvoltage is generated between shell, and it is impaired to may cause transformer.Through simulation calculation, when distribution transformer high-pressure side invades thunder and lightning
When stream amplitude reaches 20kA, even if low-pressure side arrester action message, the excessively electric of 98kV will be generated at the neutral point of high-pressure side
Pressure is more than its tolerance range that insulate.Meanwhile the overvoltage of step down side will reach in low-pressure side user, to user with
Come dangerous.
Utility model content
In view of the deficiencies of the prior art, the utility model provides a kind of distribution transformer lightning protection guarantor based on inductance filter
Protection unit.
The utility model is to solve above-mentioned technical problem by the following technical solutions: one kind is based on inductance filter
Distribution transformer lightning protection device, including high-pressure side arrester, low-pressure side arrester and inductance filter；
High-pressure side arrester include 3 phases, the high-voltage end of 3 phase high-pressure side arresters respectively with distribution transformer high-pressure side A phase,
B phase and C are connected；
Low-pressure side arrester include 3 phases, the high-voltage end of 3 phase low-pressure side arresters respectively with distribution transformer low-pressure side A phase,
B phase and C are connected；
One end of the inductance filter is connect with the neutral point of distribution transformer low-pressure side；
The low-pressure end of 3 phase high-pressure side arrester, the low-pressure end of 3 phase low-pressure side arresters and inductance filter it is another
One end is connect with distribution transformer metal shell, and the distribution transformer metal shell is connect with distribution transformer earthing net.
Further, the high-pressure side arrester uses drop type Zinc-Oxide Arrester, and the drop type zinc oxide is lightning-arrest
Device includes porcelain vase, columnar lighting arrester ontology, upper conducting connecting part, lower conducting connecting part and heat-explosion type disconnector；
The upper end of the porcelain vase is connect with one end of the upper conducting connecting part, and the lower end of porcelain vase and the heat explosion type are detached from
Device connection；The heat-explosion type disconnector is also connected with one end of the lower conducting connecting part, the other end of lower conducting connecting part
It is connect with the lower end of the columnar lighting arrester ontology；Moving contact, the dynamic touching are equipped in the upper end of the columnar lighting arrester ontology
Head is connect by operating ring with the other end of the upper conducting connecting part.
The arrester of the structure, which can exempt to operate a switch, carries out livewire work, improves to operate a switch and block present in making process now
As convenient for closing a floodgate, current-carrying part electric conductivity is more excellent, improves the security reliability of product quality and power distribution network.
Further, the high-pressure side arrester selects the metal zinc oxide lightning arrester of model YH5WS-17/50, this is kept away
Thunder device is molded using whole silicon rubber mould, and good seal performance, explosion-proof performance is excellent, and resistance to filth is free of cleaning, and can be reduced the greasy weather
Wet shwoot is raw, and electrical erosion resistance is anti-aging, small in volume, impact resistant, is easily installed and safeguards.
Further, the low-pressure side arrester selects the metal zinc oxide lightning arrester of model Y1.5WS-0.28/1.3,
Which employs the zinc oxide resistance sheets that nonlinear wind vibration is very excellent, have good steep wave response characteristic, to steep wave electricity
For pressure without delaying, residual voltage is low, without discharge dispersity, overcomes intrinsic steep because caused by delaying steep wave electric discharge of traditional lightning protection device
The high disadvantage of wave discharge voltage.
Compared with prior art, the distribution transformer lightning protection dress provided by the utility model based on inductance filter
It sets, including high-pressure side arrester, low-pressure side arrester and inductance filter；One end of inductance filter is low with distribution transformer
The neutral point connection of side is pressed, the other end connect with distribution transformer metal shell, and the impedance of inductance filter is with flowing through inductance
The frequency of filter current increases and increases, and is in high-impedance state in lightning current effect, can effectively obstruct lightning stroke distribution transformer
In the case of thunder and lightning when flowing through distribution transformer earthing net and entering ground, counterattack pours in the lightning current of distribution transformer low-pressure side neutral point,
In power current effect, impedance very little, working earthing and the protective grounding to guarantee distribution transformer neutral point are normal simultaneously；
It is positive and negative transformed that lightning protection device described in the utility model can effectively prevent lightning stroke distribution transformer to generate
Voltage, is effectively reduced the lightning fault rate of distribution transformer, and can prevent back overrating voltage from reaching in low-pressure side user；Together
When, since inductance filter can effectively prevent counterattack lightning overvoltage damage distribution transformer, distribution transformer can be reduced
Requirement of the lightning protection to platform area Resistance of Grounding Grids value, reduces the input cost of ground mat construction.
Detailed description of the invention
It, below will be to needed in embodiment description in order to illustrate more clearly of the technical solution of the utility model
Attached drawing is briefly described, it should be apparent that, the accompanying drawings in the following description is only one embodiment of the utility model, for
For those of ordinary skill in the art, without creative efforts, it can also be obtained according to these attached drawings other
Attached drawing.
Fig. 1 is a kind of structural representation of the distribution transformer lightning protection device based on inductance filter of the utility model
Figure.
Specific embodiment
Below with reference to the attached drawing in the utility model embodiment, to this implement the technical solution in novel carry out it is clear, complete
Site preparation description, it is clear that the described embodiments are only a part of the embodiments of the utility model, instead of all the embodiments.
Based on the embodiments of the present invention, those of ordinary skill in the art are obtained without creative labor
Every other embodiment, fall within the protection scope of the utility model.
As shown in Figure 1, a kind of distribution transformer lightning protection dress based on inductance filter provided by the utility model
It sets, including high-pressure side arrester, low-pressure side arrester and inductance filter；
High-pressure side arrester includes 3 phases, and 3 phase high-pressure side arresters are respectively A1, B1 and C1；3 phase high-pressure side arresters
The high-voltage end of A1, B1, C1 are connected with distribution transformer high-pressure side A phase, B phase and C respectively；
Low-pressure side arrester includes 3 phases, and 3 phase low-pressure side arresters are respectively a1, b1 and c1；3 phase low-pressure side arresters
The high-voltage end of a1, b1, c1 are connected with distribution transformer low-pressure side A phase, B phase and C respectively；
One end of inductance filter L is connect with the neutral point of distribution transformer low-pressure side；
The low-pressure end and electricity of the low-pressure end of 3 phase high-pressure side arrester A1, B1, C1,3 phase low-pressure side arrester a1, b1, c1
The other end of sense filter L is connect with distribution transformer metal shell, distribution transformer metal shell and distribution transformer earthing
Net G connection.
High-pressure side arrester uses drop type Zinc-Oxide Arrester, and drop type Zinc-Oxide Arrester includes that porcelain vase, column are kept away
Thunder device ontology, upper conducting connecting part, lower conducting connecting part and heat-explosion type disconnector；The upper end of porcelain vase and upper conducting connecting part
One end connection, the lower end of porcelain vase is connect with heat-explosion type disconnector；Heat-explosion type disconnector is also connected with one end of lower conducting connecting part
It connects, the other end of lower conducting connecting part is connect with the lower end of columnar lighting arrester ontology；It is equipped in the upper end of columnar lighting arrester ontology
Moving contact, moving contact are connect by operating ring with the other end of upper conducting connecting part；
The arrester of the structure, which can exempt to operate a switch, carries out livewire work, improves to operate a switch and block present in making process now
As convenient for closing a floodgate, current-carrying part electric conductivity is more excellent, improves the security reliability of product quality and power distribution network.
High-pressure side arrester selects the metal zinc oxide lightning arrester of model YH5WS-17/50, and the arrester is using whole
Silicon rubber mould is molded, and good seal performance, explosion-proof performance is excellent, and resistance to filth is free of cleaning, and can be reduced greasy weather wet shwoot life, resistance to electricity
Anti-aging, small in volume is lost, impact resistant is easily installed and safeguards.
Low-pressure side arrester selects the metal zinc oxide lightning arrester of model Y1.5WS-0.28/1.3, and which employs non-thread
Property the very excellent zinc oxide resistance sheet of C-V characteristic, there is good steep wave response characteristic, to steep wave voltage without delaying, residual voltage
It is low, without discharge dispersity, it is high to overcome the intrinsic steep wave discharge voltage because caused by delaying steep wave electric discharge of traditional lightning protection device
The shortcomings that.
According to the study found that thunder and lightning stream energy is concentrated mainly on high frequency, wherein the energy of 1KHz or more frequency band accounts for 76%, and
The energy of (0 ~ 100Hz) only accounts for 2.3% near power frequency.In the embodiment of the present invention, the impedance of inductance filter L is electric with its is flowed through
The frequency of stream increases and increases, and is in high-impedance state when lightning current acts on, can reach several K Ω to number in 1KHz or more frequency band resistance
Ten K Ω, can effectively obstruct lightning stroke distribution transformer in the case of thunder and lightning flow through distribution transformer earthing net G enter ground when, counterattack pours in
The lightning current of distribution transformer low-pressure side neutral point, while the impedance very little in power current effect, only tens of Ω, to guarantee
The working earthing and protective grounding of distribution transformer neutral point are normal.
When lightning stroke distribution transformer, distribution transformer high-pressure side arrester A1, B1, C1 and low-pressure side arrester a1, b1, c1
The voltage between transformer high-voltage winding, outlet wire of low voltage winding side and shell can be effectively clamped down on, inductance filter L can will be grounded
The back overrating voltage that net G is poured in is isolated with distribution transformer low-pressure side neutral point, effectively inhibits the overvoltage of transformer neutral point,
Thus distribution transformer can be effectively prevent by broken by lightning.Simultaneously because inductance filter L can effectively prevent counterattack thunder mistake
Voltage damages distribution transformer, therefore can reduce requirement of the distribution transformer lightning protection to platform area grounded screen G grounding resistance, reduces
The input cost of grounded screen G construction.
Above disclosed is only specific embodiment of the present utility model, but the protection scope of the utility model not office
It is limited to this, anyone skilled in the art within the technical scope disclosed by the utility model, can readily occur in change
Change or modification, should be covered within the scope of the utility model.
Claims (4)
1. a kind of distribution transformer lightning protection device based on inductance filter, it is characterised in that: including high-pressure side arrester,
Low-pressure side arrester and inductance filter；
High-pressure side arrester include 3 phases, the high-voltage end of 3 phase high-pressure side arresters respectively with distribution transformer high-pressure side A phase, B phase
And C is connected；
Low-pressure side arrester include 3 phases, the high-voltage end of 3 phase low-pressure side arresters respectively with distribution transformer low-pressure side A phase, B phase
And C is connected；
One end of the inductance filter is connect with the neutral point of distribution transformer low-pressure side；
The other end of the low-pressure end of 3 phase high-pressure side arrester, the low-pressure end of 3 phase low-pressure side arresters and inductance filter
It is connect with distribution transformer metal shell, the distribution transformer metal shell is connect with distribution transformer earthing net.
2. a kind of distribution transformer lightning protection device based on inductance filter as described in claim 1, it is characterised in that:
The high-pressure side arrester uses drop type Zinc-Oxide Arrester, and the drop type Zinc-Oxide Arrester includes that porcelain vase, column are kept away
Thunder device ontology, upper conducting connecting part, lower conducting connecting part and heat-explosion type disconnector；
The upper end of the porcelain vase is connect with one end of the upper conducting connecting part, and the lower end of porcelain vase and the heat-explosion type disconnector connect
It connects；The heat-explosion type disconnector is also connected with one end of the lower conducting connecting part, the other end of lower conducting connecting part and institute
State the lower end connection of columnar lighting arrester ontology；It is equipped with moving contact in the upper end of the columnar lighting arrester ontology, the moving contact is logical
Operation ring is crossed to connect with the other end of the upper conducting connecting part.
3. a kind of distribution transformer lightning protection device based on inductance filter as claimed in claim 1 or 2, feature exist
In: the high-pressure side arrester selects the metal zinc oxide lightning arrester of model YH5WS-17/50.
4. a kind of distribution transformer lightning protection device based on inductance filter as described in claim 1, it is characterised in that:
The low-pressure side arrester selects the metal zinc oxide lightning arrester of model Y1.5WS-0.28/1.3.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820982590.6U CN208423782U (en) | 2018-06-25 | 2018-06-25 | A kind of distribution transformer lightning protection device based on inductance filter |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820982590.6U CN208423782U (en) | 2018-06-25 | 2018-06-25 | A kind of distribution transformer lightning protection device based on inductance filter |
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| CN208423782U true CN208423782U (en) | 2019-01-22 |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| CN117955075A (en) * | 2024-02-01 | 2024-04-30 | 中科智寰(北京)科技有限公司 | Neutral point grounding type medium-voltage direct-current transformer and micro-grid |
-
2018
- 2018-06-25 CN CN201820982590.6U patent/CN208423782U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| CN117955075A (en) * | 2024-02-01 | 2024-04-30 | 中科智寰(北京)科技有限公司 | Neutral point grounding type medium-voltage direct-current transformer and micro-grid |
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