CN204103681U - A kind of multipair excitation slip ring - Google Patents
A kind of multipair excitation slip ring Download PDFInfo
- Publication number
- CN204103681U CN204103681U CN201420603406.4U CN201420603406U CN204103681U CN 204103681 U CN204103681 U CN 204103681U CN 201420603406 U CN201420603406 U CN 201420603406U CN 204103681 U CN204103681 U CN 204103681U
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- CN
- China
- Prior art keywords
- slip ring
- carbon brush
- excitation
- rotor
- multiple carbon
- Prior art date
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- Expired - Fee Related
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Abstract
A kind of multipair excitation slip ring, comprise at least two pairs of slip rings, each slip ring includes slip ring positive pole, slip ring negative pole, and each slip ring is provided with multiple carbon brush.Described slip ring positive pole, slip ring negative pole connect the two ends of rotor.Be interconnected between multiple carbon brush on a described slip ring.The multiple carbon brush be positioned on a slip ring on paired slip ring connect rotor positive pole, and the multiple carbon brush be positioned on another slip ring on paired slip ring connect rotor negative pole.A kind of multipair excitation slip ring of the utility model, increases slip ring quantity, not high to unit space requirement; Reduce single carbon brush by electric current, extend carbon brush useful life; Increase carbon brush quantity, can carry larger rotor current, this multipair excitation slip ring can be applicable to Generator Set, high tacho generator group.
Description
Technical field
The utility model relates to a kind of large synchronous generator parts, particularly a kind of multipair excitation slip ring.
Background technology
Large synchronous generator is all produce magnetic field to complete mechanical energy-electric energy conversion by leading to direct current to excitation winding.The simplest excitation mode is exactly exciting current is sent into by slip ring the generator amature rotated now, and all energizing apparatus all remain static, therefore are called static excitation.For rotating excitation, structure is simpler, cost is low, reliability is high, it is safer to run, control precision is high for static excitation system, workable.On excitation mode, the many employings of big-and-middle-sized unit are from shunt excitation static excitation mode.It is fast that this excitation mode has reaction speed, and dynamic quality is excellent, can improve the speciality such as the transient stability of unit and electric power system.But static excitation system has been brush excitation, 1 is all adopted to (each one group of positive and negative electrode slip ring) slip ring, exciting current to be passed into rotor windings, relative to brushless excitation generator, brush excitation tool in the technical characteristics such as dynamic stability, troubleshooting, de-excitation time-constant and function debugging is had to have great advantage.But carbon brush and slip ring serious wear, grade of spark exceed standard, and even cause ring fire, it is the key factor that impact has brush excitation generator operating condition always.Along with unit capacity is increasing, the exciting current provided needed for excitation system is also increasing, and the conductive capability of a pair slip ring and carbon brush, temperature resistance rise the continuous firing ability of (especially turbo generator) under ability and high speed conditions and be difficult to meet the requirements at the higher level of more than 100MW unit.
Existing static excitation system both positive and negative polarity is two slip rings (1 to) only, and carbon brush is evenly distributed on both positive and negative polarity slip ring, as shown in the accompanying drawing 1 in Figure of description.Under large load, high power capacity, high-revolving operating mode, carbon brush and slip ring very easily generate heat, wear and tear, and cause contact resistance instability, carbon brush sparking, even affect the idle fan-out capability of generator time serious.
Summary of the invention
For solving the problems of the technologies described above, the utility model provides a kind of multipair excitation slip ring, increases slip ring quantity, not high to unit space requirement; Reduce single carbon brush by electric current, extend carbon brush useful life; Increase carbon brush quantity, can carry larger rotor current, this multipair excitation slip ring can be applicable to Generator Set, high tacho generator group.
The technical scheme that the utility model is taked is: a kind of multipair excitation slip ring, comprises at least two pairs of slip rings, and each slip ring includes slip ring positive pole, slip ring negative pole, and each slip ring is provided with multiple carbon brush.Described slip ring positive pole, slip ring negative pole connect the two ends of rotor.
Be interconnected between multiple carbon brush on a described slip ring.The multiple carbon brush be positioned on a slip ring on paired slip ring connect rotor positive pole, and the multiple carbon brush be positioned on another slip ring on paired slip ring connect rotor negative pole.
Described slip ring is four, and totally two is right.
A kind of multipair excitation slip ring of the utility model, many group slip rings are powered, and increase rotor current handling capacity; Many carbon brush are interconnected, and improve power supply reliability.Reduce carbon brush abrasion, temperature rise, sparking, increase the service life.
Accompanying drawing explanation
Fig. 1 is static excitation system both positive and negative polarity existing described in background technology two slip ring structure schematic diagrames.
Fig. 2 is a kind of multipair excitation slip ring structure schematic diagram of the utility model.
Wherein, the dotted line in Fig. 1, Fig. 2 represents large shaft centre line.
Embodiment
As shown in Figure 2, a kind of multipair excitation slip ring, comprises at least two pairs of slip rings 1, and each slip ring 1 includes slip ring positive pole 1.1, slip ring negative pole 1.2, and each slip ring 1 is provided with multiple carbon brush 2.Described slip ring positive pole 1.1, slip ring negative pole 1.2 connect the two ends of rotor 3.Be interconnected between multiple carbon brush 2 on a described slip ring.
The multiple carbon brush 2 be positioned on a slip ring on paired slip ring connect rotor positive pole 4.1; The multiple carbon brush 2 be positioned on another slip ring on paired slip ring connect rotor negative pole 4.2.
Described slip ring 1 is four, and totally two is right.Suppose that carbon brush quantity be carbon brush quantity on the single slip ring of 2N(is N), the contact resistance of single carbon brush and slip ring is R
j, as exciting current I
ftime constant, then the electric current that flows through of single carbon brush is I
f/ N, the contact loss power P caused
1=(I
f/ N) 2*R
j; If it is still N that slip ring 1 quantity is adjusted to carbon brush quantity each slip ring of 4(from 2), then the electric current that flows through of single carbon brush is I
f/ 2N, the contact loss power caused is P
2=(I
f/ 2N) 2*R
j=0.25P
1.As can be seen here, increase slip ring quantity, and then increase carbon brush quantity.The electric current that flows through of single carbon brush can be made to be reduced to 1/2nd, contact loss power reduction is 1/4th, can significantly reduce carbon brush temperature rise, effective minimizing carbon brush sparking and heating, fail safe when changing carbon brush is higher, the reliability of four slip ring 1 power supplies is also higher, the I that corresponding large sized unit can carry
falso larger.
Claims (2)
1. a multipair excitation slip ring, it is characterized in that, comprise at least two pairs of slip rings (1), each slip ring (1) includes slip ring positive pole (1.1), slip ring negative pole (1.2), and each slip ring (1) is provided with multiple carbon brush (2); Described slip ring positive pole (1.1), slip ring negative pole (1.2) connect the two ends of rotor (3); Be interconnected between multiple carbon brush on a described slip ring; The multiple carbon brush be positioned on a slip ring on paired slip ring connect rotor positive pole (4.1), and the multiple carbon brush be positioned on another slip ring on paired slip ring connect rotor negative pole (4.2).
2. a kind of multipair excitation slip ring according to claim 1, it is characterized in that, described slip ring (1) is four, and totally two is right.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420603406.4U CN204103681U (en) | 2014-10-20 | 2014-10-20 | A kind of multipair excitation slip ring |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420603406.4U CN204103681U (en) | 2014-10-20 | 2014-10-20 | A kind of multipair excitation slip ring |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN204103681U true CN204103681U (en) | 2015-01-14 |
Family
ID=52272081
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201420603406.4U Expired - Fee Related CN204103681U (en) | 2014-10-20 | 2014-10-20 | A kind of multipair excitation slip ring |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN204103681U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109787430A (en) * | 2018-12-28 | 2019-05-21 | 四川省紫坪铺开发有限责任公司 | A kind of installation method of polarity reversal device case |
-
2014
- 2014-10-20 CN CN201420603406.4U patent/CN204103681U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109787430A (en) * | 2018-12-28 | 2019-05-21 | 四川省紫坪铺开发有限责任公司 | A kind of installation method of polarity reversal device case |
| CN109787430B (en) * | 2018-12-28 | 2020-12-22 | 四川省紫坪铺开发有限责任公司 | Installation method of polarity reversing device box |
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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 | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20150114 Termination date: 20191020 |