CN201556523U - High voltage dry type current transformer with protecting gap - Google Patents
High voltage dry type current transformer with protecting gap Download PDFInfo
- Publication number
- CN201556523U CN201556523U CN200920195081XU CN200920195081U CN201556523U CN 201556523 U CN201556523 U CN 201556523U CN 200920195081X U CN200920195081X U CN 200920195081XU CN 200920195081 U CN200920195081 U CN 200920195081U CN 201556523 U CN201556523 U CN 201556523U
- Authority
- CN
- China
- Prior art keywords
- current transformer
- high voltage
- gap
- primary winding
- protecting
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
- 238000009413 insulation Methods 0.000 abstract description 14
- 230000001681 protective effect Effects 0.000 abstract description 6
- 229910000831 Steel Inorganic materials 0.000 abstract description 4
- 239000010959 steel Substances 0.000 abstract description 4
- 239000010935 stainless steel Substances 0.000 abstract description 3
- 229910001220 stainless steel Inorganic materials 0.000 abstract description 3
- -1 polytetrafluoroethylene Polymers 0.000 abstract description 2
- 229920001343 polytetrafluoroethylene Polymers 0.000 abstract description 2
- 239000004810 polytetrafluoroethylene Substances 0.000 abstract description 2
- 229910052782 aluminium Inorganic materials 0.000 abstract 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 abstract 1
- 239000003990 capacitor Substances 0.000 abstract 1
- 239000011888 foil Substances 0.000 abstract 1
- 229910052751 metal Inorganic materials 0.000 abstract 1
- 239000002184 metal Substances 0.000 abstract 1
- 238000004804 winding Methods 0.000 description 27
- 239000004020 conductor Substances 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- 239000005030 aluminium foil Substances 0.000 description 2
- 229910000838 Al alloy Inorganic materials 0.000 description 1
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical group [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical group [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 1
- 239000004809 Teflon Substances 0.000 description 1
- 229920006362 Teflon® Polymers 0.000 description 1
- 230000015556 catabolic process Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000005684 electric field Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000009422 external insulation Methods 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 239000011810 insulating material Substances 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- 238000012946 outsourcing Methods 0.000 description 1
- 229920000915 polyvinyl chloride Polymers 0.000 description 1
- 239000004800 polyvinyl chloride Substances 0.000 description 1
- 238000004080 punching Methods 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 229920002379 silicone rubber Polymers 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 238000010200 validation analysis Methods 0.000 description 1
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- Transformers For Measuring Instruments (AREA)
Abstract
The utility model belongs to the field of high voltage electrical apparatus, and relates to a high voltage dry type current transformer with a protecting gap, which comprises a primary coil (3), a secondary coil (5), a metal shielding cover (1), a bottom frame (8), a box body (7) and a protecting gap (2), wherein the primary coil (3) is made from a U-shaped steel pipe and a plurality of cables (4), and the secondary coil (5) is sleeved on two arms of the primary coil (3), is arranged on the bottom frame (8), and is protected by the box body (7). The protecting gap (2) is arranged in a head structure of the current transformer, because of the discharge characteristics of the protecting gap (2), the voltage drop which is produced when big current passes through the primary coil can not break through turn-to-turn insulation. The primary coil (3) is supported by a stainless steel tube, a main insulation is wound by an aluminum foil and polytetrafluoroethylene to form a structure of a capacitor panel (6), and the outer portion thereof is packed with a high voltage heat-shrinkable tubing which is used as an outer protecting sleeve. Because of the protective effect of the protecting gap, the high voltage dry type current transformer can achieve the measuring requirement of 0.2s grade high precision when achieving primary currents which are 1A and 2A small currents.
Description
Technical field
The utility model belongs to the High-Voltage Electrical Appliances field, is current measurement in 35kV and the above electric power system and a kind of high voltage dry-type current transformer of protecting the gap that has of used for relay protection.
Background technology
At present, the high voltage dry-type current transformer rated primary current major part on the domestic market all be 50A or more than, the form of primary winding mostly is a circle or multiturn formula, is no more than 8 circles at most.Yet the current transformer primary current of some special purpose is very little, is generally 1A, 2A or 5A, under the so little situation of primary current, reach 0.2S level high accuracy, must adopt the form that improves number of ampere turns to realize, this moment, the number of turn of primary winding was brought up to tens circles even circle up to a hundred.This structure is the inductance coil of a multiturn number with regard to the structure that makes primary winding, inductance coil is when short circuit current appears in the primary circuit, short circuit current is by an inductance coil, two ends at an inductance coil produce a bigger voltage drop, this has just formed an electrical potential difference, when this electrical potential difference is higher than the insulation level of turn-to-turn of primary winding, will cause the turn-to-turn discharge breakdown.Thereby cause current transformer to be scrapped.
Summary of the invention
Technical problem to be solved in the utility model be for the primary winding turn-to-turn insulation of protecting high voltage dry-type current transformer short circuit current by the time be not destroyed.Can realize simultaneously the requirement of little electric current high accuracy 0.2S level metering again.
The technical scheme that the utility model technical solution problem adopts: a kind of high voltage dry-type current transformer of protecting the gap that has is made up of protection gap, primary winding, secondary coil, metallic shield, casing, underframe and terminal board.Described protection gap is installed in the head of current transformer; be connected in parallel with primary winding P1, P2 two ends; this protection gap is made up of two metallic conductors; one end is cylindrical; the other end is conical; conical conductor tip direction is facing to cylindrical side; arcing distance between two conductors in protection gap is decided through designing and calculating according to the number of ampere turns of primary winding; be installed on the insulation board by two conductors; add a protective cover in the protection gap then; make in its space that is sealed in a sealing, be not subjected to ectocine.Described primary winding U type two arms are parallel to each other, pass steel pipe by many cables, form the structure of multiple circle formula, steel pipe wrapped in teflon film and aluminium foil constitute the capacitance plate of Main Insulation Structure of Electric, at capacitance plate outsourcing hot high pressure Heat-Shrinkable Tubings, outside the hot high pressure Heat-Shrinkable Tubings, be inserted in the silicon rubber full skirt and constitute external insulation then.Described secondary coil is made and is formed by iron core, enamelled wire, insulating material, and cover installs to primary winding then, and is installed on the underframe, and places casing.Described casing is made by stainless steel casing, can guarantee higher intensity, and can play the effect of supporting entire product.
Above-mentioned protective cover has certain intensity for the Merlon pressure injection is shaped.
Above-mentioned metallic shield is the cast aluminium alloy moulding, and smooth outer surface does not have the tip, and electric field change is even.
Above-mentioned cable is a copper core polyvinyl chloride flexible cable, and the good insulation withstand voltage level is arranged.
Advantage of the present invention:
A kind of high voltage dry-type current transformer of protecting the gap that has of the utility model; the function that its protection gap will be realized; be the protective current instrument transformer primary winding turn-to-turn insulation short circuit current by the time be not destroyed; mainly be when passing through primary winding owing to short circuit current; the voltage drop that the two ends of primary winding produce is bigger; the withstand voltage level that surpasses turn-to-turn insulation when this voltage drop; will cause primary winding turn-to-turn insulation to puncture; thereby cause the fault of product, need out of service when serious.The function in protection gap is exactly the primary winding turn-to-turn insulation puncture for fear of current transformer; principle is when short circuit current produces pressure drop by primary winding; the magnitude of voltage of its pressure drop is greater than the discharge voltage in protection gap; protect this moment the gap to produce discharge; thereby, avoid primary winding turn-to-turn insulation to puncture the primary winding short circuit.When short circuit current disappeared, the protection gap did not produce discharge.And current transformer is when operate as normal, and its primary winding is by rated primary current, and the voltage drop that the coil two ends produce is lower, does not reach the discharge voltage in protection gap, and protect the gap to be in open-circuit condition this moment.
Description of drawings
Fig. 1 is a contour structures schematic diagram of the present utility model
Fig. 2 is the schematic diagram in the utility model protection gap
The schematic diagram of Fig. 3 after for the assembling of the utility model protection gap
Embodiment
As Fig. 1, Fig. 2 and shown in Figure 3; a kind of high voltage dry-type current transformer of protecting the gap that has; comprise primary winding (3), secondary coil (5), metallic shield (1), underframe (8), casing (7) and protection gap (2), described primary winding (3) is made by U-shaped steel pipe and cable (4).Described secondary coil (5) is sleeved on primary winding (3) two arms, and places on the underframe (8), and is in casing (7) protection down.Described protection gap (2) is installed on the insulation board (9); head position as shown in Figure 1; the number of turn according to designing requirement and primary winding (3); regulate the arcing distance in protection gap (2); and then protective cover (10) is assemblied on protection gap (2); before the protective cover (10) in protection gap (2) is inserted primary winding (3) two ends; whether discharge under the voltage that sets in test protection gap (2) earlier; need be through test repeatedly; whether validation test result and design load be close; then just the assembling of the guard shield (10) in protection gap (2); again the two ends in protection gap (2) are connected on the P1 and the P2 two ends of primary winding (3) respectively, at last the metallic shield of head position (1) are assembled.
Described primary winding (3) is supported by stainless steel tube, and main insulation is alternately twined capacitance plate (6) structure that forms by aluminium foil and polytetrafluoroethylene, is surrounded by the hot high pressure Heat-Shrinkable Tubings outside it and makes oversheath.
Described secondary coil (5) is supported by underframe (8), and punching is in primary winding (3), and is protected by casing (7).
Claims (1)
1. one kind has the high voltage dry-type current transformer of protecting the gap, comprise primary winding (3), secondary coil (5), metallic shield (1), underframe (8), casing (7) and protection gap (2), described primary winding (3) U-shaped two arms are parallel to each other, and secondary coil (5) runs through by primary winding (3); Described secondary coil (5) and primary winding (3) are installed on the underframe (8), and place in the casing (7); Be inserted in the silicon rubber full skirt outside the described primary winding (3) and make external insulation; It is characterized in that: described protection gap (2) is installed in the head position of current transformer; be made up of two metallic conductors, an end is cylindrical, and the other end is conical; conical conductor tip direction faces toward cylindrical side, and is placed in the protective cover (10).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200920195081XU CN201556523U (en) | 2009-09-21 | 2009-09-21 | High voltage dry type current transformer with protecting gap |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200920195081XU CN201556523U (en) | 2009-09-21 | 2009-09-21 | High voltage dry type current transformer with protecting gap |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201556523U true CN201556523U (en) | 2010-08-18 |
Family
ID=42616212
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN200920195081XU Expired - Fee Related CN201556523U (en) | 2009-09-21 | 2009-09-21 | High voltage dry type current transformer with protecting gap |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201556523U (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104360160A (en) * | 2014-11-14 | 2015-02-18 | 国家电网公司 | High-voltage loop contact resistor live line measurement device |
| CN104360163A (en) * | 2014-11-14 | 2015-02-18 | 国家电网公司 | Contact resistor live-line measurement device capable of preventing fault arcs |
| CN104360132A (en) * | 2014-11-14 | 2015-02-18 | 国家电网公司 | Contact resistance live line measurement device |
| CN105244158A (en) * | 2015-10-21 | 2016-01-13 | 成都迅德科技有限公司 | Current transformer |
| CN110208669A (en) * | 2019-06-26 | 2019-09-06 | 国网浙江省电力有限公司电力科学研究院 | The device and method of insulation degradation between simulation oil immersed type capacitor panel of current transformer |
-
2009
- 2009-09-21 CN CN200920195081XU patent/CN201556523U/en not_active Expired - Fee Related
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104360160A (en) * | 2014-11-14 | 2015-02-18 | 国家电网公司 | High-voltage loop contact resistor live line measurement device |
| CN104360163A (en) * | 2014-11-14 | 2015-02-18 | 国家电网公司 | Contact resistor live-line measurement device capable of preventing fault arcs |
| CN104360132A (en) * | 2014-11-14 | 2015-02-18 | 国家电网公司 | Contact resistance live line measurement device |
| CN105244158A (en) * | 2015-10-21 | 2016-01-13 | 成都迅德科技有限公司 | Current transformer |
| CN110208669A (en) * | 2019-06-26 | 2019-09-06 | 国网浙江省电力有限公司电力科学研究院 | The device and method of insulation degradation between simulation oil immersed type capacitor panel of current transformer |
| CN110208669B (en) * | 2019-06-26 | 2024-05-10 | 国网浙江省电力有限公司电力科学研究院 | Device and method for simulating insulation degradation between capacitive screens of oil-immersed current transformer |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20100818 Termination date: 20170921 |
|
| CF01 | Termination of patent right due to non-payment of annual fee |