CN103280282A - Brake resistor used for current transformer of wind driven generator - Google Patents
Brake resistor used for current transformer of wind driven generator Download PDFInfo
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- CN103280282A CN103280282A CN2013101457058A CN201310145705A CN103280282A CN 103280282 A CN103280282 A CN 103280282A CN 2013101457058 A CN2013101457058 A CN 2013101457058A CN 201310145705 A CN201310145705 A CN 201310145705A CN 103280282 A CN103280282 A CN 103280282A
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- brake resistance
- driven generator
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Abstract
The invention provides a brake resistor used for a current transformer of a wind driven generator. The brake resistor comprises an annular baseplate attached to an inner peripheral surface of a tower wall of the wind driven generator; an annular pinch plate combined to the annular baseplate so as to form a hollow space between the annular baseplate and the annular pinch plate; a first resistor disc and a second resistor disc; wherein each resistor disc is in an annular band shape; a plurality of through holes are arranged at predetermined intervals along the peripheral direction of each resistor disc; the first resistor disc and the second resistor disc are separated from each other by a predetermined distance; a plurality of insulated terminals penetrating through corresponding through holes of the first resistor disc and the second resistor disc so as to support and fix the first resistor disc and the second resistor disc; and a plurality of fixed components, each fixed component penetrating through the annular pinch plate, corresponding insulated terminals and the annular baseplate, and being fixed to the inner peripheral surface of the tower wall of the wind driven generator.
Description
Technical field
The invention belongs to wind power generation field, relate to a kind of improved brake resistance for the wind-driven generator current transformer.
Background technology
The brake resistance that is used for the wind-driven generator current transformer is a kind of wind power system electric braking device, and this brake apparatus is installed in the wind-driven generator, when wind-driven generator is braked unnecessary electric energy is converted into heat energy and makes its dissipation.For effective and reliable electric braking is provided to wind-driven generator, brake resistance need be born big electric current (for example reaching the kilo-ampere level) and high-power (for example reaching MW class), and the temperature rise that needs to guarantee to have good heat radiation to make resistive element is 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, connects by bolt between a plurality of resistor discs.Because brake resistance is temporary impact work, cause brake resistance the temperature inside the box in time not distribute, so when brake resistance heat is calculated with the space heat elimination of negligible resistance, will cause the cost of brake resistance to raise like this, shortcoming such as technical difficulty is big.Owing to use bolt to connect between a plurality of resistor discs, cause resistor disc stray inductance and parasitic capacitance to increase.When brake resistance the instantaneous work of high pressure occurs because of bus, because stray inductance causes brake resistance can not in time discharge the bus energy, make the wind-driven generator unit overvoltage occur and shut down even cause danger.
Summary of the invention
The present invention is directed to the shortcoming of prior art, a kind of improved brake resistance for the wind-driven generator current transformer is provided.
According to an aspect of the present invention, a kind of brake resistance for the wind-driven generator current transformer comprises: annular bottom plate is attached on the interior perimeter surface of tower barrel of wind-driven generator; The annular buckle is attached to annular bottom plate, in the space of annular bottom plate and annular buckle formation hollow; First resistor disc and second resistor disc, each resistor disc is endless belt shape, has been provided at predetermined intervals a plurality of through holes along the circumferencial direction of each resistor disc at each resistor disc, and first resistor disc and second resistor disc are spaced apart at a predetermined distance from each other up and down; A plurality of insulated terminals, the respective through hole of passing first resistor disc and second resistor disc is to support and to fix first resistor disc and second resistor disc; A plurality of fixed components, each fixed component passes annular buckle, corresponding insulated terminal and annular bottom plate, and is fixed on the interior perimeter surface of tower barrel of wind-driven generator.
The annular buckle can comprise: vertical extension; Last extension and lower extension branch flatly extend from the top and bottom of vertical extension respectively, and are attached to the top and bottom of annular bottom plate respectively.
Can be provided with current-carrying part in first precalculated position of first resistor disc and second resistor disc, current-carrying part is connected to each other first resistor disc and second resistor disc.
Second precalculated position that separates with first precalculated position that the dc bus of the current transformer of wind-driven generator can be connected to first resistor disc and second resistor disc, thus first resistor disc, second resistor disc, current-carrying part and current transformer form the 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 second resistor disc can be positioned at the middle part of insulated terminal along the longitudinally of insulated terminal.
Description of drawings
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 the wind-driven generator current transformer of the present invention;
Fig. 3 is the local amplification view of brake resistance shown in Figure 2.
Embodiment
Brake resistance is installed in the wind-driven generator, is used for when wind-driven generator is braked that unnecessary electric energy is converted into heat energy and makes its dissipation on the dc bus with the wind-driven generator current transformer, does not continue rising thereby stablize the dc bus temperature.
Electric current and voltage acting on the brake resistance can produce heat Q, and the heat formula is: Q=Pt=u (t) * i (t) * t, and wherein, P is power, and u (t) is the instantaneous voltage of brake resistance, and i (t) is the current instantaneous value of brake resistance, and t is the time.
The heat Q that calculates above is the energy that wind-driven generator need dissipate.
Obtain as follows according to the endergonic formula relation 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 the energy that brake resistance need consume is a determined value, therefore heating becomes the main performance assessment criteria of brake resistance.According to the endergonic formula of brake resistance as can be known, under the constant situation of energy Q, the mass M of the variations in temperature of brake resistance (rising) Δ T and brake resistance is inversely proportional to.In addition, if the energy Q that brake resistance need consume is constant, the mass M of brake resistance is constant, and the specific heat capacity of brake resistance is constant, and then the variations in temperature Δ T of brake resistance is also constant.
Describe according to the brake resistance for the wind-driven generator current transformer of the present invention below with reference 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 local amplification view of brake resistance shown in Figure 2.
With reference to Fig. 2 and Fig. 3, according to the brake resistance for the wind-driven generator current transformer of the present invention band structure ringwise on the whole, be attached on the interior perimeter 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, a plurality of insulated terminal 14 and a plurality of fixed component 15.
The cross section of annular buckle 12 can be c-shaped.Annular buckle 12 comprises vertical extension 121, go up extension 122 and lower extension divides 123.Last extension 122 and lower extension divide 123 flatly to extend from the top and bottom of vertical extension 121 respectively, and last extension 122 and lower extension are divided 123 top and bottom that are attached to annular bottom plate 11 respectively.
Each resistor disc in first resistor disc 131 and second resistor disc 132 is endless belt shape.Circumferencial direction along each resistor disc has been provided at predetermined intervals a plurality of through holes at each resistor disc.First resistor disc 131 and second resistor disc 132 are spaced apart at a predetermined distance from each other up and down.Can current-carrying part 16 be set in first precalculated position of first resistor disc 131 and second resistor disc 132, current-carrying part 16 is connected to each other first resistor disc 131 and second resistor disc 132.Second precalculated position that separates with first precalculated position that the dc bus of the current transformer of wind-driven generator can be connected to first resistor disc 131 and second resistor disc 132, first resistor disc 131, second resistor disc 132, current-carrying part 16 and current transformer can form the closed-loop path thus, thereby first resistor disc 131 and second resistor disc 132 will be converted into heat energy from the unnecessary electric energy of current transformer and make its dissipation when wind-driven generator is braked.
According to Fig. 2 and Fig. 3 as can be known, first resistor disc 131 can be connected with tower barrel 17 by insulated terminal 14 with second resistor disc 132, insulated terminal 14 plays insulating effect, use annular buckle 12 with the inner space isolation of first resistor disc 131 and second resistor disc 132 and tower barrel 17, so both saved the space of platform at the bottom of the blower fan tower, and made the brake resistance installation specification attractive in appearance again.The brake resistance ring attaching is attached to tower barrel 17, the area of dissipation of brake resistance was increased, in the time interval of having dwindled brake resistance bump, reduced the weight of brake resistance housing again (compared with prior art, approximately reduce by 20% weight), safeguard at the scene of being convenient to.
When brake resistance absorbs same energy, it is a determined value that the temperature of brake resistance raises, but be attached to the area of dissipation that brake resistance on the tower tube has increased resistor disc by ring attaching, but bump repeatedly when absorbing identical energy, the bump time interval dwindles, thereby it is lower that the material temperature of the resistor disc of brake resistance is floated parameter request.The resistor disc material of brake resistance commonly used is stainless steel (SUS304), if guarantee the temperature rise of brake resistance, then need select temperature to float lower material, and the cost of brake resistance will be risen.Yet, little because of temperature rise according to brake resistance of the present invention, the material requirements of brake resistance is descended, thereby save cost.
In the present invention, the resistor disc of brake resistance is made into monolithic and greater than the length of the box brake resistance sheet of tradition, the resistor disc tie point is reduced as far as possible, thereby makes the stray inductance of brake resistance reduce.
According to the operation principle of brake resistance as can be known, brake resistance is instantaneous work, and when the DC bus-bar voltage of current transformer was higher than the brake voltage thresholding, brake resistance was started working, but the brake resistance operating time is very short, therefore can ignore the work moment cooling link of traditional box brake resistance.
In addition, though the interior perimeter surface that has illustrated among Fig. 2 at tower barrel 17 is provided with a brake resistance, but should be appreciated that, the factors such as size of the amount of the unnecessary electric energy that produces in the time of can braking according to wind-driven generator, the material that forms the resistor disc of brake resistance, resistor disc are come in the interior perimeter surface of tower barrel 17 one or more brake resistances to be set, and what a plurality of brake resistances can be along the tower tube is axially spaced.
Though the present invention is specifically described with reference to its exemplary embodiment and is shown, but will be understood by those skilled in the art that, under the situation that does not break away from the spirit and scope of the present invention that are defined by the claims, can carry out the various changes of form and details to it.
Claims (6)
1. brake resistance that is used for the wind-driven generator current transformer comprises:
Annular bottom plate is attached on the interior perimeter surface of tower barrel of wind-driven generator;
The annular buckle is attached to annular bottom plate, in the space of annular bottom plate and annular buckle formation hollow;
First resistor disc and second resistor disc, each resistor disc is endless belt shape, has been provided at predetermined intervals a plurality of through holes along the circumferencial direction of each resistor disc at each resistor disc, and first resistor disc and second resistor disc are spaced apart at a predetermined distance from each other up and down;
A plurality of insulated terminals, the respective through hole of passing first resistor disc and second resistor disc is to support and to fix first resistor disc and second resistor disc;
A plurality of fixed components, each fixed component passes annular buckle, corresponding insulated terminal and annular bottom plate, and is fixed on the interior perimeter surface of tower barrel of wind-driven generator.
2. brake resistance according to claim 1, wherein, annular buckle comprises: vertical extension; Last extension and lower extension branch flatly extend from the top and bottom of vertical extension respectively, and are attached to the top and bottom of annular bottom plate respectively.
3. brake resistance according to claim 1 wherein, is provided with current-carrying part in first precalculated position of first resistor disc and second resistor disc, and current-carrying part is connected to each other first resistor disc and second resistor disc.
4. brake resistance according to claim 3, wherein, second precalculated position that separates with first precalculated position that the dc bus of the current transformer of wind-driven generator is connected to first resistor disc and second resistor disc, thus first resistor disc, second resistor disc, current-carrying part and current transformer form the closed-loop path.
5. brake resistance 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. brake resistance according to claim 5, wherein, first resistor disc and 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 true CN103280282A (en) | 2013-09-04 |
| CN103280282B CN103280282B (en) | 2016-04-13 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| 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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| CN (1) | CN103280282B (en) |
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 |
|---|---|
| CN103280282B (en) | 2016-04-13 |
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