CN207367766U - A kind of built-in transformer current-limiting apparatus - Google Patents
A kind of built-in transformer current-limiting apparatus Download PDFInfo
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- CN207367766U CN207367766U CN201621094427.3U CN201621094427U CN207367766U CN 207367766 U CN207367766 U CN 207367766U CN 201621094427 U CN201621094427 U CN 201621094427U CN 207367766 U CN207367766 U CN 207367766U
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Abstract
It the utility model is related to a kind of built-in transformer current-limiting apparatus.Its main feature is that：Including the first branch, the second branch and the 3rd branch, the first branch, the second branch and the 3rd respective one end of branch connect three-winding transformer (1) on high-tension side neutral point at the same time and its other end draws connect line end and C connects line end as connect line end, B of A respectively, and the wherein first branch, the second branch and the 3rd branch is composed in parallel by capacitor (2), current-limiting reactor (3) and high-speed switch (4) three.The utility model has significant advantages and beneficial effects compared with prior art, is embodied in the following aspects：Using the built-in current-limiting apparatus of the utility model, realize the automatic switching of current-limiting reactor, impedance from main regulation, reduce short circuit current flow to newly developing transformer and the impact in fortune transformer, while reduce loss, easy to maintain.Transformer reactance device integrated design can be realized using the built-in current-limiting apparatus of the utility model.
Description
Technical field
It the utility model is related to a kind of built-in transformer current-limiting apparatus.
Background technology
With the application of large-capacity power transformer, short circuit current flow is consequently increased, and the generation entail dangers to of short trouble becomes
The dynamic thermal stability of depressor.Built-in transformer current-limiting apparatus is different from traditional current-limiting apparatus, its main operational principle is：
Current-limiting apparatus is placed in oil tank of transformer, and the high-speed switch in current-limiting apparatus is in parallel with current-limiting reactor, transformer normal work
When, high-speed switch closure, current-limiting reactor is shorted；When short trouble occurs, high-speed switch disconnects, current-limiting reactor access
Impedance is improved with limiting short-circuit current, while in current-limiting reactor both ends shunt capacitor, reactor when occurring short-circuit with suppression
The overvoltage at both ends.
Built-in current-limiting apparatus more adapts to be used in newly-built transformer.Compared with other types current-limiting apparatus, built-in limit
Stream device have be swift in motion, connecting-disconnecting function is strong, current limitation effect is excellent and the distinguishing feature such as energy saving.Current-limiting reactor is with quickly opening
Parallel connection is closed, it is reduced loss in transformer normal operation, but the high-impedance behavior of existing high-impedance transformer exists
During system normal operation, it is unfavorable for energy saving, and econmics comparison is poor.Meanwhile transformer impedance drop is higher, the size of transformer
Also bigger, manufacture cost is also higher.
Utility model content
The purpose of this utility model is to provide a kind of built-in transformer current-limiting apparatus, can overcome and exist in the prior art
Deficiency, when short trouble occurs put into current-limiting reactor carry out current limliting, reduce the impact of Short-Circuit Current on Transformer, extend
Transformer life.
A kind of built-in transformer current-limiting apparatus, it is particular in that：Including the first branch, the second branch and the 3rd
Road, the first branch, the second branch and the 3rd respective one end of branch connect the on high-tension side neutral point of three-winding transformer at the same time and
Its other end is drawn respectively connects line end and C connects line end as connect line end, B of A, wherein the first branch, the second branch and
3rd branch is composed in parallel by capacitor, current-limiting reactor and high-speed switch three.
Shielding aluminum barrel including both ends open, the both ends of the shielding aluminum barrel are provided with disc insulator by flange respectively,
Quick switch of capacitor shunting means, epoxy resin are sequentially installed between two disc insulators in the shielding aluminum barrel
Cylinder, current-limiting reactor coil is wound with the epoxy resin cylinder.
Wherein Quick switch of capacitor shunting means includes capacitor and high-speed switch in parallel.
Its epoxy resin cylinder bottom is equipped with epoxy resin tube stent, the epoxy resin holder base and shielding aluminum barrel bottom
The flanged joint in portion.
Its epoxy resin cylinder is connected by flange with epoxy resin tube stent.
It is connected at the top of its epoxy resin cylinder by flange with Quick switch of capacitor shunting means bottom.
The utility model has significant advantages and beneficial effects compared with prior art, is embodied in following side
Face：Using the built-in current-limiting apparatus of the utility model, realize the automatic switching of current-limiting reactor, impedance from main regulation, reduce
Short circuit current flow reduces loss, easy to maintain to newly developing transformer and the impact in fortune transformer.Use the utility model
Built-in current-limiting apparatus and method can realize transformer reactance device integrated design.
Brief description of the drawings
Attached drawing 1 is the circuit diagram of the utility model；
Attached drawing 2 is the structure diagram of the utility model.
Embodiment
As shown in Figure 1, 2, the utility model provides a kind of built-in transformer current-limiting apparatus, including the first branch,
Two branches and the 3rd branch, it is high that the first branch, the second branch and the 3rd respective one end of branch connect three-winding transformer 1 at the same time
Press the neutral point of side and its other end draws connect line end and C connects line end, wherein this first as connect line end, B of A respectively
Road, the second branch and the 3rd branch are composed in parallel by capacitor 2, current-limiting reactor 3 and 4 three of high-speed switch.
The concrete structure of the utility model device includes the shielding aluminum barrel 7 of both ends open, the both ends difference of the shielding aluminum barrel 7
Disc insulator 5 is provided with by flange 6, Quick switch of capacitor is sequentially installed with simultaneously between two disc insulators 5
Coupling device 8, epoxy resin cylinder 10, current-limiting reactor coil 11 is wound with the epoxy resin cylinder 10.Wherein capacitor is quick
Switch in parallel device 8 includes capacitor 2 and high-speed switch 4 in parallel.Its 10 bottom of epoxy resin cylinder is equipped with epoxy resin cylinder
Stent 12,12 bottom of epoxy resin tube stent are connected with the flange 6 of 7 bottom of shielding aluminum barrel, Quick switch of capacitor and multi pack
The flange 6 that 8 tops are put with 7 top of shielding aluminum barrel does not contact.
Its epoxy resin cylinder 10 is connected by flange 6 with epoxy resin tube stent 12.In addition the top of epoxy resin cylinder 10
It is connected by flange 6 with 8 bottom of Quick switch of capacitor shunting means.
A kind of method of limiting transformer short circuit, includes the following steps：
(1) current limliting for meeting current limliting requirement is sealed in respectively between the high-voltage winding of three-phase three-winding transformer and neutral point
Reactor 3；
(2) in 3 both ends parallel connection high-speed switch 4 of current-limiting reactor, when short circuit current flow occurs, lead in short circuit current flow zero passage
Cross disconnection high-speed switch 4 and put into current-limiting reactor 3, and when to transformer normal operation, current-limiting reactor 3 is by high-speed switch 4
Short circuit.
Current limliting requirement refers to that short circuit current flow should be restricted to less than the 60% of former short circuit current flow in step (1).Such as with
Exemplified by 63MVA, 110/38.5/10.5kV transformer, the short-circuit impedance percentage of transformer senior middle school winding is 10.5%, transformer
The method of operation choose the senior middle school method of operation, the famous value of high middle impedance is Xhl=20.167 Ω.Then reactor reactance value should not
Less than the limitation required reactance value of 40% short circuit current flow
Also be parallel with capacitor 2 at 3 both ends of current-limiting reactor in step (1), thus limit input current-limiting reactor 3 when
The transient overvoltage that its both ends produces.
Embodiment 1：
The utility model is further described below in conjunction with attached drawing：As shown in Figure 1, including three-winding transformer 1, capacitance
Device 2, current-limiting reactor 3, high-speed switch 4.
A kind of built-in transformer current-limiting apparatus, including current-limiting reactor coil 11, aluminum barrel, disc insulator 5, flange 6,
Epoxy resin cylinder 10, high-speed switch 4, capacitor 2, its main feature is that current-limiting reactor 3, high-speed switch 4,2 three of capacitor parallel connection.
Referring to Fig. 2, for a kind of built-in transformer current-limiting apparatus structure of the utility model, including disc insulator 5, method
Orchid 6, shielding aluminum barrel 7, Quick switch of capacitor shunting means 8, SF6Air-filled pore 9, epoxy resin cylinder 10, current-limiting reactor coil
11 and epoxy resin tube stent 12, the radial distance of wherein aluminum barrel 7 and coil 11 is taken as 50mm or so, and it is right to reduce shielding aluminum barrel 7
3 reactance value of current-limiting reactor must influence, and current-limiting reactor coil 11 is wrapped on epoxy resin cylinder 10.Flange 6 and current-limiting reactor
The distance of device coil 11 is taken as 100mm or so, on the one hand reduces the effectiveness being vortexed in aluminum flange 6, is on the other hand to reduce
The short-circuit electromotive force produced in flange 6, in order to avoid the short-circuit impact that can not be born is brought to disc insulator 5.
A kind of method using the short circuit of above device limiting transformer, comprises the following steps：
(1) sealed in respectively between the high-voltage winding of three-phase transformer and neutral point and meet that current limliting requires (60% short circuit
Electric current) reactor；
(2) 3 automatic switching device of current-limiting reactor is installed：In 3 both ends parallel connection high-speed switch 4 of current-limiting reactor, work as short circuit
When electric current occurs, current-limiting reactor 3 can be quickly put into short circuit current flow zero passage, during transformer normal operation, current-limiting reactor 3
It is short-circuited；
(3) transient overvoltage produced for limitation input current-limiting reactor 3 at its both ends, in its both ends certain capacitance in parallel
The capacitor 2 of value.
The built-in transformer current-limiting apparatus structure of the utility model has energy saving and quick acting, reduces short circuit current flow pair
The impact of transformer winding.Using technical solution described in the utility model, or those skilled in the art is in the utility model
Under the inspiration of technical solution, similar technical solution is designed, and reaches above-mentioned technique effect, is to fall into this practicality newly
The protection domain of type.
Claims (6)
- A kind of 1. built-in transformer current-limiting apparatus, it is characterised in that：, should including the first branch, the second branch and the 3rd branch The first branch, the second branch and the 3rd respective one end of branch connect three-winding transformer (1) on high-tension side neutral point at the same time and its The other end is drawn respectively connects line end and C connects line end, the wherein first branch, the second branch and as connect line end, B of A Three branches are composed in parallel by capacitor (2), current-limiting reactor (3) and high-speed switch (4) three.
- A kind of 2. built-in transformer current-limiting apparatus as claimed in claim 1, it is characterised in that：Shielding including both ends open Aluminum barrel (7), the both ends of the shielding aluminum barrel (7) are provided with disc insulator (5) by flange (6) respectively, in the shielding aluminum barrel (7) Quick switch of capacitor shunting means (8), epoxy resin cylinder (10) are sequentially installed between two interior disc insulators (5), Current-limiting reactor coil (11) is wound with the epoxy resin cylinder (10).
- A kind of 3. built-in transformer current-limiting apparatus as claimed in claim 2, it is characterised in that：Wherein Quick switch of capacitor Shunting means (8) includes capacitor (2) and high-speed switch (4) in parallel.
- A kind of 4. built-in transformer current-limiting apparatus as claimed in claim 2, it is characterised in that：Its epoxy resin cylinder (10) Bottom is equipped with epoxy resin tube stent (12), the flange (6) of epoxy resin tube stent (12) bottom and shielding aluminum barrel (7) bottom Connection.
- A kind of 5. built-in transformer current-limiting apparatus as claimed in claim 4, it is characterised in that：Its epoxy resin cylinder (10) It is connected by flange (6) with epoxy resin tube stent (12).
- A kind of 6. built-in transformer current-limiting apparatus as claimed in claim 2, it is characterised in that：Its epoxy resin cylinder (10) Top is connected by flange (6) with Quick switch of capacitor shunting means (8) bottom.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201621094427.3U CN207367766U (en) | 2016-09-29 | 2016-09-29 | A kind of built-in transformer current-limiting apparatus |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201621094427.3U CN207367766U (en) | 2016-09-29 | 2016-09-29 | A kind of built-in transformer current-limiting apparatus |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN207367766U true CN207367766U (en) | 2018-05-15 |
Family
ID=62423406
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201621094427.3U Expired - Fee Related CN207367766U (en) | 2016-09-29 | 2016-09-29 | A kind of built-in transformer current-limiting apparatus |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN207367766U (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107068365A (en) * | 2016-09-29 | 2017-08-18 | 国家电网公司 | A kind of method of built-in transformer current-limiting apparatus and limiting transformer short circuit |
| CN109686542A (en) * | 2018-12-06 | 2019-04-26 | 中铁电气化局集团有限公司 | A kind of energy-economic transformer |
| CN111092416A (en) * | 2018-10-24 | 2020-05-01 | 南京南瑞继保电气有限公司 | High-voltage short-circuit current limiting device and control method |
-
2016
- 2016-09-29 CN CN201621094427.3U patent/CN207367766U/en not_active Expired - Fee Related
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107068365A (en) * | 2016-09-29 | 2017-08-18 | 国家电网公司 | A kind of method of built-in transformer current-limiting apparatus and limiting transformer short circuit |
| CN111092416A (en) * | 2018-10-24 | 2020-05-01 | 南京南瑞继保电气有限公司 | High-voltage short-circuit current limiting device and control method |
| CN111092416B (en) * | 2018-10-24 | 2021-07-27 | 南京南瑞继保电气有限公司 | High-voltage short-circuit current limiting device and control method |
| CN109686542A (en) * | 2018-12-06 | 2019-04-26 | 中铁电气化局集团有限公司 | A kind of energy-economic transformer |
| CN109686542B (en) * | 2018-12-06 | 2020-12-01 | 中铁电气化局集团有限公司 | Energy-saving transformer |
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| Date | Code | Title | Description |
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| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20180515 Termination date: 20210929 |