CN202275793U - Voltage transformer high voltage fuse - Google Patents
Voltage transformer high voltage fuse Download PDFInfo
- Publication number
- CN202275793U CN202275793U CN2011202950299U CN201120295029U CN202275793U CN 202275793 U CN202275793 U CN 202275793U CN 2011202950299 U CN2011202950299 U CN 2011202950299U CN 201120295029 U CN201120295029 U CN 201120295029U CN 202275793 U CN202275793 U CN 202275793U
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- nickel
- voltage transformer
- fuse
- transformer high
- voltage
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Abstract
The utility model relates to an important device which is used for the measurement and protection in an electrical power system, i.e. a voltage transformer high voltage fuse. The voltage transformer high voltage fuse is composed of lead-tin alloy balls (1) and nickel-chromium wires (2). The lead-tin alloy balls (1) are separated via the nickel-chromium wires (2). The number of the nickel-chromium wires (2) is at least three, and the nickel-chromium wires (2) are same in length. The number of the lead-tin alloy balls (1) is two less than the number of the nickel-chromium wires (2). Each lead-tin alloy ball (1) is welded between two nickel-chromium wires (2). The voltage transformer high voltage fuse has the advantages of simple structure, excellent conductivity, oxidation resistance, and easy processing.
Description
Technical field
The utility model relates to the visual plant that supplies to measure and protect usefulness in the electric power system, particularly is applicable to the high-tension fuse that voltage transformer is used.
Background technology
High-voltage mutual inductor is the visual plant that supplies to measure and protect usefulness in the electric power system, and it has following important function:
I. system high voltage is changed into the low-voltage (100v) of standard, for instrument, protection provide necessary voltage.
II. match the phase voltage of measurement circuitry and line voltage with measuring instrument; Match with protective relaying device, system and equipment are carried out overvoltage, one-phase ground protection.
III. isolate primary equipment and secondary device, the safety of the protection person and equipment.
Just because of voltage transformer has so important effect,, it seems particularly necessary for installing corresponding protection device (high-tension fuse) additional.High-tension fuse is that economy can satisfy certain reliability again, and it simple in structure is easy to Maintenance and Repair, in 35kv and following system, is widely used.
The high-tension fuse protection range of voltage transformer is: the short trouble of voltage transformer internal fault (alternate, turn-to-turn short circuit etc.) or voltage transformer and electrical network connecting line.
When being short-circuited when the voltage transformer internal fault or with the electrical network connecting line, high-tension fuse fusing, disengagement failure point or with voltage transformer and source of trouble isolation, thus dwindle fault coverage, protect the safety of equipment.But high-tension fuse is not used for protecting voltage transformer overload, and overload time is long slightly, and voltage transformer will be overheated, smolder, even on fire, thereby causes internal fault; And because high-tension fuse sensitivity, voltage transformer internal fault sometimes, high-tension fuse is not necessarily fusing but.We are the disabling faulty voltage transformer as early as possible, if high-tension fuse is not with current-limiting resistance or current-limiting resistance defective, just can not directly draw back the false voltage instrument transformer with isolating switch; Even current-limiting resistance is qualified, can not directly draw back for the sake of assurance, because isolating switch and high-tension fuse do not have arc-control device; Cause busbar short-circuit easily; Cause accident expansion and device damage or personal injury, must be through switching operational mode, with the isolated fault of higher level's circuit breaker.
For the double bus scheme mode, can be to another bus, with bus connection switch isolated fault voltage transformer with institute's on-load; For single-trunk segmental wiring mode commonly used, must this section bus institute on-load all be shifted or power failure, with power circuit breaker isolated fault voltage transformer and this section bus, recover other normal power supply again.Such complicated operation is unfavorable for quick isolated fault, and possibly influence the normal power supply of certain customers.
If the high-tension fuse of voltage transformer has enough sensitivity, when the voltage transformer internal fault, fusing immediately, the isolated fault point directly draws back the false voltage instrument transformer with regard to available isolating switch, and needn't be through switching the such complex operations of operational mode.The key here is the melt (silk) of high-tension fuse, and it is the core component of fuse, utilizes it under the electrical current heat effect, to melt the open failure circuit.Fuse commonly used is a nichrome, and the diameter of fuse is 0.13mm, does spirality, and total resistance is 315 Ω, and rated current is 0.5A, shown in accompanying drawing 1.
The material of melt generally has copper, nichrome, lead, tin etc., for the voltage transformer of 35kv system, requires fuse to have bigger cutout ability; Copper commonly used or nichrome; Their resistivity is little, and heat conduction is fast, and area of section is also very little; The metal vapors that cutout produces is also few, is easy to arc extinguishing.But it is high that shortcoming is a fusion temperature, possibly reach higher temperature in the long-term work and do not fuse, and will make its quick fuse simultaneously, must flow through bigger electric current, otherwise can prolong fusing time, unfavorable to protected voltage transformer like this.
Summary of the invention
The purpose of the utility model is: a kind of low melting point that both had is provided, and again can be through the voltage transformer fuse of big electric current.
For realizing above-mentioned purpose, the utility model adopts following technical scheme: be made up of terne metal ball and nickel filament, the terne metal ball is separated by nickel filament; Nickel filament is at least three of equal lengths, and terne metal nodule number amount is lacked two than nickel filament, and it is welded between two nickel filaments.
The utlity model has following advantage: simple in structure, good conductivity is difficult for oxidation, is convenient to processing.
Description of drawings
Fig. 1 the utility model prior art sketch map;
Fig. 2 is the utility model structural representation.
Specific embodiments
The utility model does not receive the restriction of following embodiment, can confirm concrete execution mode according to the technical scheme and the actual conditions of the utility model.
Do further detailed explanation below in conjunction with 1 pair of the utility model of accompanying drawing.Shown in accompanying drawing 2, the utility model is made up of terne metal ball 1 and nickel filament 2, and terne metal ball 1 is separated by nickel filament 2.
The interval of terne metal ball 1 and size are by production technology and actual needs decision.
Terne metal ball ball 1 also can adopt integral body to cast with nickel filament 2 processing modes.
Above technical characterictic has constituted the most preferred embodiment of the utility model, and it has stronger adaptability and best implementation result, can increase and decrease non-essential technical characterictic according to actual needs, satisfies the demand of different situations.
Performance:
Product specification before improving: fuse is a nichrome, and the diameter of fuse is 0.13mm, and the long 300mm of fuse does spirality, and total resistance is 315 Ω, and rated current is 0.5A.
Improve the back product specification: the nickel filament diameter is 0.13mm, terne metal bulb diameter 0.5mm, terne metal ball spacing distance 10mm, total length 300mm.
Performance comparison sheet before and after improving
| Type | Fusing point | Financial cost | All-in resistance | Sensitivity |
| Before the improvement | 1200℃ | Higher | 315Ω | Relatively poor |
| After the improvement | 350℃ | Low | 317Ω | High |
| Conclusion | Obviously reduce | Reduce | Conformance with standard | Effect is remarkable |
Claims (2)
1. voltage transformer high-tension fuse, it is characterized in that: be made up of terne metal ball (1) and nickel filament (2), terne metal ball (1) is separated by nickel filament (2).
2. voltage transformer high-tension fuse according to claim 1 is characterized in that: nickel filament (2) is at least three of equal lengths, and terne metal ball (1) quantity is lacked two than nickel filament (2), and it is welded between two nickel filaments (2).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011202950299U CN202275793U (en) | 2011-08-06 | 2011-08-06 | Voltage transformer high voltage fuse |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011202950299U CN202275793U (en) | 2011-08-06 | 2011-08-06 | Voltage transformer high voltage fuse |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202275793U true CN202275793U (en) | 2012-06-13 |
Family
ID=46196134
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2011202950299U Expired - Fee Related CN202275793U (en) | 2011-08-06 | 2011-08-06 | Voltage transformer high voltage fuse |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202275793U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104934272A (en) * | 2015-07-15 | 2015-09-23 | 海安县天星电工材料有限公司 | High voltage fuse |
-
2011
- 2011-08-06 CN CN2011202950299U patent/CN202275793U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104934272A (en) * | 2015-07-15 | 2015-09-23 | 海安县天星电工材料有限公司 | High voltage fuse |
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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: 20120613 Termination date: 20130806 |