CN103280282B - For the brake resistance of current transformer of wind-driven generator - Google Patents
For the brake resistance of current transformer of wind-driven generator Download PDFInfo
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- CN103280282B CN103280282B CN201310145705.8A CN201310145705A CN103280282B CN 103280282 B CN103280282 B CN 103280282B CN 201310145705 A CN201310145705 A CN 201310145705A CN 103280282 B CN103280282 B CN 103280282B
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- driven generator
- brake resistance
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Abstract
The invention provides a kind of brake resistance for current transformer of wind-driven generator, described brake resistance comprises: annular bottom plate, is attached in the inner peripheral surface of tower barrel of wind-driven generator; Annular buckle, is attached to annular bottom plate, forms the space of hollow at annular bottom plate and annular buckle; First resistor disc and the second resistor disc, each resistor disc is endless belt shape, and the circumferencial direction along each resistor disc has been provided at predetermined intervals multiple through hole on each resistor disc, and the first resistor disc and the second resistor disc are spaced apart at a predetermined distance from each other up and down; Multiple insulated terminal, through the respective through hole of the first resistor disc and the second resistor disc, to support and to fix the first resistor disc and the second resistor disc; Multiple fixed component, each fixed component through annular buckle, corresponding insulated terminal and annular bottom plate, and is fixed in the inner peripheral surface of tower barrel of wind-driven generator.
Description
Technical field
The invention belongs to wind power generation field, relate to a kind of brake resistance for current transformer of wind-driven generator of improvement.
Background technology
Brake resistance for current transformer of wind-driven generator is a kind of wind power system electric braking device, and this brake apparatus is arranged in wind-driven generator, when wind-driven generator is braked, unnecessary electric energy conversion is heat energy and makes it dissipate.In order to provide effective to wind-driven generator and reliable electric braking, brake resistance needs to bear big current (such as reaching kilo-ampere level) and high-power (such as reaching MW class), and needs to ensure good heat radiation and make the temperature rise of resistive element within the scope of setting.
Fig. 1 shows the brake resistance according to prior art.With reference to Fig. 1, this brake resistance is case structure, is connected between multiple resistor disc by bolt.Because brake resistance is temporary impact work, brake resistance the temperature inside the box is caused not distribute in time, so when brake resistance heat calculates by the space heat elimination of negligible resistance, will the cost of brake resistance be caused to raise like this, the shortcomings such as technical difficulty is large.Owing to using bolt to connect between multiple resistor disc, resistor disc stray inductance and parasitic capacitance is caused to increase.When brake resistance because of bus occur high pressure and instantaneous work time, because stray inductance causes brake resistance can not discharge bus energy in time, make wind-driven generator unit occur overvoltage shut down even cause danger.
Summary of the invention
The present invention is directed to the shortcoming of prior art, a kind of brake resistance for current transformer of wind-driven generator of improvement is provided.
According to an aspect of the present invention, a kind of brake resistance for current transformer of wind-driven generator comprises: annular bottom plate, is attached in the inner peripheral surface of tower barrel of wind-driven generator; Annular buckle, is attached to annular bottom plate, forms the space of hollow at annular bottom plate and annular buckle; First resistor disc and the second resistor disc, each resistor disc is endless belt shape, and the circumferencial direction along each resistor disc has been provided at predetermined intervals multiple through hole on each resistor disc, and the first resistor disc and the second resistor disc are spaced apart at a predetermined distance from each other up and down; Multiple insulated terminal, through the respective through hole of the first resistor disc and the second resistor disc, to support and to fix the first resistor disc and the second resistor disc; Multiple fixed component, each fixed component through annular buckle, corresponding insulated terminal and annular bottom plate, and is fixed in the inner peripheral surface of tower barrel of wind-driven generator.
Annular buckle can comprise: vertically extension; Upper extension and downward-extension part, flatly extend from the top and bottom of vertical extension respectively, and be attached to the top and bottom of annular bottom plate respectively.
First precalculated position of the first resistor disc and the second resistor disc can be provided with current-carrying part, the first resistor disc and the second resistor disc are connected to each other by current-carrying part.
The second precalculated position separated with the first precalculated position that the DC bus of the current transformer of wind-driven generator can be connected to the first resistor disc and the second resistor disc, thus the first resistor disc, the second resistor disc, current-carrying part and current transformer form closed-loop path.
The two ends of each insulated terminal can contact vertical extension and the annular bottom plate of annular buckle respectively.
First resistor disc and the second resistor disc can be positioned at the middle part of insulated terminal along the longitudinally of insulated terminal.
Accompanying drawing explanation
In conjunction with the drawings, from the description of the following examples, the present invention these and/or other side and advantage will become clear, and are easier to understand, wherein:
Fig. 1 shows the brake resistance according to prior art;
Fig. 2 shows the unitary construction figure according to the brake resistance for current transformer of wind-driven generator of the present invention;
Fig. 3 is the enlarged partial sectional view of the brake resistance shown in Fig. 2.
Embodiment
Brake resistance is arranged in wind-driven generator, and for electric energy conversion unnecessary on the DC bus of current transformer of wind-driven generator being heat energy when wind-driven generator is braked and making it dissipate, thus stable DC bus temperature does not continue to raise.
Electric current and voltage acting in brake resistance can produce heat Q, and heat formula is: Q=Pt=u (t) × i (t) × t, wherein, P is power, the instantaneous voltage that u (t) is brake resistance, the current instantaneous value that i (t) is brake resistance, t is the time.
The heat Q calculated above is the energy that wind-driven generator needs to dissipate.
Obtain as follows according to the endergonic formula relationship of brake resistance:
Q=C×M×ΔT
Wherein, C is the specific heat capacity of brake resistance, and M is the quality of brake resistance, and Δ T is the variations in temperature of brake resistance.If brake resistance absorbs heat, then the temperature of brake resistance raises.
Because brake resistance needs the energy consumed to be a determined value, therefore heating becomes the main performance assessment criteria of brake resistance.According to the endergonic formula of brake resistance, when energy Q is constant, variations in temperature (rising) the Δ T of brake resistance and the mass M of brake resistance are inversely proportional to.In addition, if brake resistance needs the energy Q consumed constant, the mass M of brake resistance is constant, and the specific heat capacity of brake resistance is constant, then the variations in temperature Δ T of brake resistance is also constant.
Describe according to the brake resistance for current transformer of wind-driven generator of the present invention referring to Fig. 2 and Fig. 3.Fig. 2 shows the unitary construction figure according to brake resistance of the present invention, and Fig. 3 is the enlarged partial sectional view of the brake resistance shown in Fig. 2.
With reference to Fig. 2 and Fig. 3, according to the brake resistance for current transformer of wind-driven generator of the present invention band structure ringwise on the whole, be attached in the inner peripheral surface of tower barrel of wind-driven generator.
Brake resistance comprises annular bottom plate 11, annular buckle 12, first resistor disc 131, second resistor disc 132, multiple insulated terminal 14 and multiple fixed component 15.
Annular bottom plate 11 is attached in the inner peripheral surface of tower barrel 17 of wind-driven generator.Annular buckle 12 is attached to annular bottom plate 11, forms the space of hollow at annular bottom plate 11 and annular buckle 12.
The cross section of annular buckle 12 can be c-shaped.Annular buckle 12 comprises vertical extension 121, upper extension 122 and downward-extension part 123.Upper extension 122 and downward-extension part 123 flatly extend from the top and bottom of vertical extension 121 respectively, and upper extension 122 and downward-extension part 123 are attached to the top and bottom of annular bottom plate 11 respectively.
Each resistor disc in first resistor disc 131 and the second resistor disc 132 is endless belt shape.Circumferencial direction along each resistor disc has been provided at predetermined intervals multiple through hole on each resistor disc.First resistor disc 131 and the second resistor disc about 132 are spaced apart at a predetermined distance from each other.Can arrange current-carrying part 16 in the first precalculated position of the first resistor disc 131 and the second resistor disc 132, the first resistor disc 131 and the second resistor disc 132 are connected to each other by current-carrying part 16.The second precalculated position separated with the first precalculated position that the DC bus of the current transformer of wind-driven generator can be connected to the first resistor disc 131 and the second resistor disc 132, first resistor disc 131, second resistor disc 132, current-carrying part 16 and current transformer can form closed-loop path thus, thus the unnecessary electric energy conversion from current transformer is heat energy when wind-driven generator is braked and makes it dissipate by the first resistor disc 131 and the second resistor disc 132.
Insulated terminal 14 passes the respective through hole of the first resistor disc 131 and the second resistor disc 132, to support and to fix the first resistor disc 131 and the second resistor disc 132.The two ends of each insulated terminal 14 can contact vertical extension 121 and the annular bottom plate 11 of annular buckle 12 respectively.Each fixed component 15 is through the vertical extension 121 of annular buckle 12, insulated terminal 14 and annular bottom plate 11, and be fixed in the inner peripheral surface of tower barrel 17 of wind-driven generator, so that annular bottom plate 11, insulated terminal 14, first resistor disc 131 and the second resistor disc 132 and annular buckle 12 are fixed in the inner peripheral surface of tower barrel 17 of wind-driven generator.Fixed component 15 can be bolt, screw etc.First resistor disc 131 and the second resistor disc 132 can be positioned at the middle part of insulated terminal 14 along the longitudinally of insulated terminal 14.
According to Fig. 2 and Fig. 3, first resistor disc 131 is connected with tower barrel 17 by insulated terminal 14 with the second resistor disc 132, insulated terminal 14 plays insulating effect, annular buckle 12 is used first resistor disc 131 and the second resistor disc 132 to be isolated with the inner space of tower barrel 17, so both save the space of platform at the bottom of blower fan tower, make again brake resistance installation specification attractive in appearance.Brake resistance ring attaching is attached to tower barrel 17, both made the area of dissipation of brake resistance increase, and reduced the time interval of brake resistance bump, turn reduce the weight of brake resistance housing (compared with prior art, the weight of about minimizing 20%), the scene of being convenient to is safeguarded.
When brake resistance absorbs same energy, it is a determined value that the temperature of brake resistance raises, but the area of dissipation of resistor disc is added by the ring attaching brake resistance be attached on tower cylinder, absorb identical energy time can bump repeatedly, the bump time interval reduces, thus lower to the material temperature drift parameter request of the resistor disc of brake resistance.The resistor disc material of conventional brake resistance is stainless steel (SUS304), if will ensure the temperature rise of brake resistance, then needs the material selecting temperature drift lower, will make the cost increase of brake resistance like this.But, according to brake resistance of the present invention, because temperature rise is little, the material requirements of brake resistance is declined, thus save cost.
In the present invention, the resistor disc of brake resistance is made into monolithic and is greater than the length of traditional box brake resistance sheet, resistor disc tie point is reduced as far as possible, thus the stray inductance of brake resistance is reduced.
According to the operation principle of brake resistance, brake resistance is instantaneous work, and when the DC bus-bar voltage of current transformer is higher than brake voltage thresholding, brake resistance is started working, but the brake resistance operating time is very short, the operating instant cooling link of traditional box brake resistance therefore can be ignored.
In addition, although illustrated in Fig. 2 and be provided with a brake resistance in the inner peripheral surface of tower barrel 17, but should be appreciated that, the amount of the unnecessary electric energy produced when can brake according to wind-driven generator, the material of resistor disc, the size of resistor disc etc. of formation brake resistance because usually arranging one or more brake resistance in the inner peripheral surface of tower barrel 17, and multiple brake resistance can be spaced along the axis of tower cylinder.
Although the present invention is described in detail with reference to its exemplary embodiment and shows, but will be understood by those skilled in the art that, when not departing from the spirit and scope of the present invention be defined by the claims, the various changes of form and details can be carried out to it.
Claims (6)
1., for a brake resistance for current transformer of wind-driven generator, comprising:
Annular bottom plate, is attached in the inner peripheral surface of tower barrel of wind-driven generator;
Annular buckle, is attached to annular bottom plate, forms the space of hollow between annular bottom plate and annular buckle;
First resistor disc and the second resistor disc, each resistor disc is endless belt shape, and the circumferencial direction along each resistor disc has been provided at predetermined intervals multiple through hole on each resistor disc, and the first resistor disc and the second resistor disc are spaced apart at a predetermined distance from each other up and down;
Multiple insulated terminal, through the respective through hole of the first resistor disc and the second resistor disc, to support and to fix the first resistor disc and the second resistor disc;
Multiple fixed component, each fixed component through annular buckle, corresponding insulated terminal and annular bottom plate, and is fixed in the inner peripheral surface of tower barrel of wind-driven generator.
2. the brake resistance for current transformer of wind-driven generator according to claim 1, wherein, annular buckle comprises: vertically extension; Upper extension and downward-extension part, flatly extend from the top and bottom of vertical extension respectively, and be attached to the top and bottom of annular bottom plate respectively.
3. the brake resistance for current transformer of wind-driven generator according to claim 1, wherein, the first precalculated position of the first resistor disc and the second resistor disc is provided with current-carrying part, the first resistor disc and the second resistor disc are connected to each other by current-carrying part.
4. the brake resistance for current transformer of wind-driven generator according to claim 3, wherein, the second precalculated position separated with the first precalculated position that the DC bus of the current transformer of wind-driven generator is connected to the first resistor disc and the second resistor disc, thus the first resistor disc, the second resistor disc, current-carrying part and current transformer form closed-loop path.
5. the brake resistance for current transformer of wind-driven generator according to claim 2, wherein, the two ends of each insulated terminal contact vertical extension and the annular bottom plate of annular buckle respectively.
6. the brake resistance for current transformer of wind-driven generator according to claim 5, wherein, the first resistor disc and the second resistor disc are positioned at the middle part of insulated terminal along the longitudinally of insulated terminal.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310145705.8A CN103280282B (en) | 2013-04-24 | 2013-04-24 | For the brake resistance of current transformer of wind-driven generator |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310145705.8A CN103280282B (en) | 2013-04-24 | 2013-04-24 | For the brake resistance of current transformer of wind-driven generator |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN103280282A CN103280282A (en) | 2013-09-04 |
| CN103280282B true CN103280282B (en) | 2016-04-13 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201310145705.8A Active CN103280282B (en) | 2013-04-24 | 2013-04-24 | For the brake resistance of current transformer of wind-driven generator |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0622812A1 (en) * | 1993-04-29 | 1994-11-02 | Gec Alsthom Transport Sa | Powerresistor with natural convection |
| CN2363356Y (en) * | 1998-11-30 | 2000-02-09 | 西安神电避雷器有限公司 | Neutral point grounding resistor |
| CN2482192Y (en) * | 2001-06-21 | 2002-03-13 | 尹宪宏 | Combined potentiometer of multiarm well diameter instrument |
| CN202206256U (en) * | 2011-01-28 | 2012-04-25 | 大连宜顺机电有限公司 | Wind power resistor |
-
2013
- 2013-04-24 CN CN201310145705.8A patent/CN103280282B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0622812A1 (en) * | 1993-04-29 | 1994-11-02 | Gec Alsthom Transport Sa | Powerresistor with natural convection |
| CN2363356Y (en) * | 1998-11-30 | 2000-02-09 | 西安神电避雷器有限公司 | Neutral point grounding resistor |
| CN2482192Y (en) * | 2001-06-21 | 2002-03-13 | 尹宪宏 | Combined potentiometer of multiarm well diameter instrument |
| CN202206256U (en) * | 2011-01-28 | 2012-04-25 | 大连宜顺机电有限公司 | Wind power resistor |
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| Publication number | Publication date |
|---|---|
| CN103280282A (en) | 2013-09-04 |
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