CN201887437U - Two-point grounding protective device for iron core of resistance type transformer - Google Patents
Two-point grounding protective device for iron core of resistance type transformer Download PDFInfo
- Publication number
- CN201887437U CN201887437U CN2010206790928U CN201020679092U CN201887437U CN 201887437 U CN201887437 U CN 201887437U CN 2010206790928 U CN2010206790928 U CN 2010206790928U CN 201020679092 U CN201020679092 U CN 201020679092U CN 201887437 U CN201887437 U CN 201887437U
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- Prior art keywords
- current
- iron core
- protective device
- limiting resistance
- transformer
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- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical group [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 title claims abstract description 29
- 230000001681 protective effect Effects 0.000 title claims abstract description 26
- 230000001012 protector Effects 0.000 claims abstract description 22
- 239000004020 conductor Substances 0.000 claims description 5
- WABPQHHGFIMREM-UHFFFAOYSA-N lead(0) Chemical compound [Pb] WABPQHHGFIMREM-UHFFFAOYSA-N 0.000 abstract 1
- 230000005283 ground state Effects 0.000 description 4
- 230000003071 parasitic effect Effects 0.000 description 4
- 238000004804 winding Methods 0.000 description 4
- 230000005684 electric field Effects 0.000 description 3
- 238000007667 floating Methods 0.000 description 3
- 238000007664 blowing Methods 0.000 description 2
- 239000002828 fuel tank Substances 0.000 description 2
- 238000009413 insulation Methods 0.000 description 2
- FGRBYDKOBBBPOI-UHFFFAOYSA-N 10,10-dioxo-2-[4-(N-phenylanilino)phenyl]thioxanthen-9-one Chemical compound O=C1c2ccccc2S(=O)(=O)c2ccc(cc12)-c1ccc(cc1)N(c1ccccc1)c1ccccc1 FGRBYDKOBBBPOI-UHFFFAOYSA-N 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000004907 flux Effects 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 238000013021 overheating Methods 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 230000001131 transforming effect Effects 0.000 description 1
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Abstract
The utility model relates to a two-point grounding protective device for an iron core of a resistance type transformer, which consists of a protective device and a wire broken protector, wherein the protective device comprises a digital voltmeter, a digital ammeter, an overcurrent self-tripping air switch K and a current-limit resistor R, the wire broken protector comprises a current-limit resistor RF of the wire broken protector. The two-point grounding protective device for the iron core of the resistance type transformer can monitor the grounding current of the iron core in a real time manner, when two points (or multiple points) of the iron core are grounded, the current-limit resistor is connected to enable the grounding current to be limited to be in a safety valve, so as to prevent accidents from expanding and ensure safety running of a transformer. Furthermore, the wire broken protector can prevent a connecting wire between a lead wire sleeve of the iron core of the transformer, and the protective device from being broken or prevent the current-limit resistor R from being burnt to be broken when the protective device is in a current-limit grounding state, so that the transformer device can be protected in an omni-bearing way.
Description
Technical field
The utility model relates to the power transmission and transforming equipment field, relates in particular to a kind of transformer and detects and protective device.
Background technology
When transformer normally moved, the electric field that constitutes between charged winding and lead-in wire thereof and fuel tank was a non-uniform electric field, and iron core and its hardware just are in this electric field.All exist parasitic capacitance between high-low pressure winding, iron core and hardware thereof, the earth fuel tank, charged winding will produce floating potential by the coupling of parasitic capacitance.When the potential difference between 2 o'clock is able to puncture therebetween insulation, just produce intermittent discharge, the result of intermittent discharge decomposes transformer oil, and solid insulation is damaged, and causes accident to take place.Therefore, the iron core of transformer and folder thereof should reliably be connected with the grounding system of transformer station, make parasitic capacitance between iron core and folder thereof and the earth by short circuit, are in zero potential.What at this moment, flow through in earth connection is the parasitic capacitance electric current of charged winding to iron core and folder thereof.When the three-phase voltage symmetry, the capacitance current sum is extremely small.In order to protect device for transformer; usually draw an earth connection from transformer core; but when iron core and 2 above ground connection of folder appearance; form the closed-loop path between the earth point; when passing this closed-loop path, main flux will produce circulating current; electric current is excessive, causes the local overheating accident, and traditional approach can not play a very good protection.According to the operation department statistics, 2 of iron core and folders and multipoint earthing fault have become one of transformer frequent failure.
Summary of the invention
In order to overcome fault or the damage that causes transformer because of 2 of iron cores or multipoint earthing, the utility model provides a kind of resistance-type transformer core 2 earth protective devices.
The technical scheme that the utility model is adopted for achieving the above object is: 2 earth protective devices of resistance-type transformer core, protective device comprises that digital voltmeter, digital ammeter, overcurrent are from tripping air switch K and current-limiting resistance R, digital voltmeter one end is connected with iron core grounding line leading-out terminal by the voltmeter downlead, and the other end is connected with current-limiting resistance R; Digital ammeter one end is connected with iron core grounding line leading-out terminal by down conductor, and the other end is connected with earth connection from tripping air switch K through overcurrent; Current-limiting resistance R is parallel to overcurrent from tripping air switch K two ends.
Also comprise line disconnection protector, line disconnection protector comprises line disconnection protector current-limiting resistance RF, and line disconnection protector current-limiting resistance RF one end is connected with iron core grounding line leading-out terminal by the line disconnection protector downlead, and the other end is connected with earth connection.
Current-limiting resistance R current-limiting resistance R ' in parallel and current-limiting resistance R ", current-limiting resistance R ' series connection button n1, current-limiting resistance R " series connection button n2.
2 earth protective devices of resistance-type transformer core of the present utility model; can monitor in real time iron core grounding current; insert current-limiting resistance and make earth current be restricted to safety value when iron core takes place by two point (or multiple spot) ground connection, the accident that prevents enlarges, but guarantees still safe operation of transformer.Simultaneously, line disconnection protector can also prevent that transformer core lead-out wire sleeve pipe from blowing to the connecting conducting wire between protective device broken string or when protective device is under the current limliting ground state resistance R, thus the omnibearing device for transformer of having protected.
Description of drawings
Fig. 1 is 2 earth protective device structure principle charts of the utility model resistance-type transformer core.
Embodiment
The principle of 2 earth protective devices of resistance-type transformer core as shown in Figure 1, whole device is made up of protective device 7 and line disconnection protector 8, protective device 7 comprises that digital voltmeter 9, digital ammeter 10, overcurrent are from tripping air switch K and current-limiting resistance R, digital voltmeter 9 one ends are connected with iron core grounding line leading-out terminal 3 by voltmeter downlead 5, and the other end is connected with current-limiting resistance R; Digital ammeter 10 1 ends are connected with iron core grounding line leading-out terminal 3 by down conductor 4, and the other end is connected with earth connection 11 from tripping air switch K through overcurrent; Current-limiting resistance R is parallel to overcurrent from tripping air switch K two ends.Line disconnection protector 8 comprises line disconnection protector current-limiting resistance RF, and line disconnection protector current-limiting resistance RF one end is connected with iron core grounding line leading-out terminal 3 by line disconnection protector downlead 6, and the other end is connected with earth connection 11.Current-limiting resistance R current-limiting resistance R ' in parallel and current-limiting resistance R ", current-limiting resistance R ' series connection button n1, current-limiting resistance R " series connection button n2.
Its operation principle is as follows: the iron core lead-out wire 2 of drawing from transformer core 1, during normal the operation, overcurrent from tripping air switch K in closure state, the down conductor 4 of drawing from iron core grounding line leading-out terminal 3 directly links with transformer case 12, make transformer core 1 be in direct ground connection running status, at this moment digital ammeter 10 is directly indicated the earth current of transformer core 1 under this state continuously; When 2 ground connection are taken place when, earth current will increase, when earth current greater than the device set point the time overcurrent disconnect from tripping air switch K, current-limiting resistance R inserts automatically, make transformer core 1 by changing current limliting ground state immediately into from the directly grounded running status of tripping air switch K through resistance R through overcurrent, transformer core 1 earth current is restricted to smaller value, prevent the further expansion of earth fault, guarantee the safe operation of transformer, can also utilize button n1 and button n2 to insert current-limiting resistance R ' and current-limiting resistance R according to actual needs ".
Claims (3)
1. 2 earth protective devices of resistance-type transformer core, it is characterized in that: protective device (7) comprises that digital voltmeter (9), digital ammeter (10), overcurrent are from tripping air switch K and current-limiting resistance R, digital voltmeter (9) one ends are connected with iron core grounding line leading-out terminal (3) by voltmeter downlead (5), and the other end is connected with current-limiting resistance R; Digital ammeter (10) one ends are connected with iron core grounding line leading-out terminal (3) by down conductor (4), and the other end is connected with earth connection (11) from tripping air switch K through overcurrent; Current-limiting resistance R is parallel to overcurrent from tripping air switch K two ends.
2. 2 earth protective devices of resistance-type transformer core according to claim 1; it is characterized in that: also comprise line disconnection protector (8); line disconnection protector (8) comprises line disconnection protector current-limiting resistance RF; line disconnection protector current-limiting resistance RF one end is connected with iron core grounding line leading-out terminal (3) by line disconnection protector downlead (6), and the other end is connected with earth connection (11).
3. 2 earth protective devices of resistance-type transformer core according to claim 1 is characterized in that: current-limiting resistance R current-limiting resistance R ' in parallel and current-limiting resistance R ", current-limiting resistance R ' series connection button n1, current-limiting resistance R " series connection button n2.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010206790928U CN201887437U (en) | 2010-12-24 | 2010-12-24 | Two-point grounding protective device for iron core of resistance type transformer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010206790928U CN201887437U (en) | 2010-12-24 | 2010-12-24 | Two-point grounding protective device for iron core of resistance type transformer |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201887437U true CN201887437U (en) | 2011-06-29 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2010206790928U Expired - Fee Related CN201887437U (en) | 2010-12-24 | 2010-12-24 | Two-point grounding protective device for iron core of resistance type transformer |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201887437U (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102790385A (en) * | 2012-08-16 | 2012-11-21 | 大连世有电力科技有限公司 | Grounding current limiting device for transformer core |
| CN110649586A (en) * | 2019-09-27 | 2020-01-03 | 上海锐开电气有限公司 | Iron core grounding current over-current suppression resistance circuit |
| CN115811035A (en) * | 2023-01-29 | 2023-03-17 | 国网山西省电力公司电力科学研究院 | Device and method for selecting optimal current-limiting impedance for transformer core multi-point grounding current |
-
2010
- 2010-12-24 CN CN2010206790928U patent/CN201887437U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102790385A (en) * | 2012-08-16 | 2012-11-21 | 大连世有电力科技有限公司 | Grounding current limiting device for transformer core |
| CN110649586A (en) * | 2019-09-27 | 2020-01-03 | 上海锐开电气有限公司 | Iron core grounding current over-current suppression resistance circuit |
| CN115811035A (en) * | 2023-01-29 | 2023-03-17 | 国网山西省电力公司电力科学研究院 | Device and method for selecting optimal current-limiting impedance for transformer core multi-point grounding current |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| PE01 | Entry into force of the registration of the contract for pledge of patent right |
Denomination of utility model: Two-point grounding protective device for iron core of resistance type transformer Effective date of registration: 20120723 Granted publication date: 20110629 Pledgee: Liaoning financial credit Company limited by guarantee Pledgor: Dalian New Anyue Electric Power Equipment Co., Ltd. Registration number: 2012990000396 |
|
| PC01 | Cancellation of the registration of the contract for pledge of patent right |
Date of cancellation: 20130626 Granted publication date: 20110629 Pledgee: Liaoning financial credit Company limited by guarantee Pledgor: Dalian New Anyue Electric Power Equipment Co., Ltd. Registration number: 2012990000396 |
|
| PLDC | Enforcement, change and cancellation of contracts on pledge of patent right or utility model | ||
| PE01 | Entry into force of the registration of the contract for pledge of patent right |
Denomination of utility model: Two-point grounding protective device for iron core of resistance type transformer Effective date of registration: 20130717 Granted publication date: 20110629 Pledgee: Liaoning financial credit Company limited by guarantee Pledgor: Dalian New Anyue Electric Power Equipment Co., Ltd. Registration number: 2013990000463 |
|
| PLDC | Enforcement, change and cancellation of contracts on pledge of patent right or utility model | ||
| PC01 | Cancellation of the registration of the contract for pledge of patent right |
Date of cancellation: 20140620 Granted publication date: 20110629 Pledgee: Liaoning financial credit Company limited by guarantee Pledgor: Dalian New Anyue Electric Power Equipment Co., Ltd. Registration number: 2013990000463 |
|
| PLDC | Enforcement, change and cancellation of contracts on pledge of patent right or utility model | ||
| PE01 | Entry into force of the registration of the contract for pledge of patent right |
Denomination of utility model: Two-point grounding protective device for iron core of resistance type transformer Effective date of registration: 20140623 Granted publication date: 20110629 Pledgee: Liaoning financial credit Company limited by guarantee Pledgor: Dalian New Anyue Electric Power Equipment Co., Ltd. Registration number: 2014990000494 |
|
| PLDC | Enforcement, change and cancellation of contracts on pledge of patent right or utility model | ||
| PC01 | Cancellation of the registration of the contract for pledge of patent right |
Date of cancellation: 20150901 Granted publication date: 20110629 Pledgee: Liaoning financial credit Company limited by guarantee Pledgor: Dalian New Anyue Electric Power Equipment Co., Ltd. Registration number: 2014990000494 |
|
| PLDC | Enforcement, change and cancellation of contracts on pledge of patent right or utility model | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20110629 Termination date: 20151224 |
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| EXPY | Termination of patent right or utility model |