CN203660770U - Grounding device for steam-turbine generator - Google Patents
Grounding device for steam-turbine generator Download PDFInfo
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- CN203660770U CN203660770U CN201320824335.6U CN201320824335U CN203660770U CN 203660770 U CN203660770 U CN 203660770U CN 201320824335 U CN201320824335 U CN 201320824335U CN 203660770 U CN203660770 U CN 203660770U
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- 239000003990 capacitor Substances 0.000 claims abstract description 6
- 230000004888 barrier function Effects 0.000 claims description 10
- 239000003822 epoxy resin Substances 0.000 claims description 5
- 229920000647 polyepoxide Polymers 0.000 claims description 5
- 230000003068 static effect Effects 0.000 abstract description 7
- 230000000694 effects Effects 0.000 abstract description 4
- 238000000034 method Methods 0.000 description 12
- 230000005284 excitation Effects 0.000 description 6
- 239000011810 insulating material Substances 0.000 description 3
- 238000009413 insulation Methods 0.000 description 3
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- 208000003656 Electric Burns Diseases 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 230000004907 flux Effects 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
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Abstract
The utility model discloses a grounding device for a steam-turbine generator. The device comprises an RC unit and an electric brush unit, wherein one end of the RC unit is configured to be grounded, and the other end of the RC unit is connected with the electric brush unit. The electric brush unit is configured to be in electrical contact with the end shaft of the exciter of the steam-turbine generator. Due to the adoption of the above technical scheme of the utility model, the RC unit is arranged between the end shaft of the exciter of the steam-turbine generator and the ground, so that the effects of effectively eliminating static charges and reducing the shaft current are realized under the effect of a resistor. Meanwhile, due to the adoption of a capacitor, the ratio of the capacitor voltages of the shaft to the ground is lowered, and the high-frequency voltage peak value is also reduced.
Description
Technical field
The utility model relates to conduction connection area, particularly, relates to a kind of turbo generator earthing device.
Background technology
With the large turbo-type generator group of static excitation system, the high-frequency pulse signal that its static excitation system produces is superimposed on basic shaft voltage can produce shaft voltage.The situation of the big or small random groups of shaft voltage is different and different.Usually, unit capacity is larger, and its air-gap flux is larger, the asymmetry of structure is also more obvious, and in magnetic field, the irregularity degree of harmonic component and core sataration degree and stator is also larger, and shaft voltage peak value is just higher.The waveform of shaft voltage has complicated harmonic component, adopts the unit of static controlled rectification excitation, in its shaft voltage waveform, has very high pulse component.
Along with the increase of unit capacity and the application of static excitation system, static excitation system has produced a kind of new shaft voltage, and it is that the amplitude that superposes on basic shaft voltage is that the low-frequency voltage of 60V and high frequency voltage that peak value is 30V form.The shaft current that turbine generator unit shaft voltage causes can cause very large harm, the steam turbine axle journal that shaft voltage causes, the event of bearing shell contact point electric burn.Turbine generator shaft voltage is higher, if do not processed, the serious bearing shell that even burns, causes larger economic loss.
For the shaft voltage on restriction generator, turbine rotor produces galvano-cautery fault to turbo generator bearing shell, most way is by direct macro-axis ground connection at steam turbine main shaft side one grounding brush.But, because the speed of generator turbine end rotating shaft surface rotation is very high, existing grounding brush was often lost efficacy, and existing earthing device can not be eliminated high frequency shaft voltage peak value.
For the problems referred to above, in prior art, there is no good solution.
Utility model content
The purpose of this utility model is to provide a kind of equipment and method, can effectively eliminate high frequency shaft voltage peak value.
To achieve these goals, the utility model provides a kind of turbo generator earthing device, and this device comprises: RC unit and brush unit, and wherein said RC unit is configured to one end ground connection, and the other end connects described brush unit; And described brush unit is configured to electrically contact with the exciter end axle of described turbo generator.
Alternatively, described brush unit comprises following element: brush holder, brush carrier and brush, and wherein said brush holder is configured to fixing described brush carrier, and is provided with insulating barrier between described brush holder and described brush carrier; And described brush carrier is configured to grip described brush.
Alternatively, wherein said insulating barrier is epoxy resin board.
Alternatively, wherein said device comprise two groups described in brush unit, described in two groups, brush unit is separately positioned on the journal centre both sides of described exciter end axle.
Alternatively, described RC unit comprises that resistance value in parallel is that resistance R and the capacitance of 500 Ω is the capacitor C of 10 μ F.
By technique scheme, between the exciter end axle of turbo generator and ground, RC unit is set, resistance can effectively be eliminated electrostatic charge and reduce shaft current, and electric capacity add the ratio that can reduce axle direct-to-ground capacitance voltage, reduce high frequency voltage peak value.
Other feature and advantage of the present utility model are described in detail the embodiment part subsequently.
Brief description of the drawings
Accompanying drawing is to be used to provide further understanding of the present utility model, and forms a part for specification, is used from explanation the utility model, but does not form restriction of the present utility model with embodiment one below.In the accompanying drawings:
Fig. 1 is the turbo generator earthing device composition structured flowchart according to the utility model execution mode;
Fig. 2 is the turbo generator earthing device structural representation according to the utility model execution mode; And
Fig. 3 is the turbo generator earthing method flow chart according to the utility model execution mode.
Embodiment
Below in conjunction with accompanying drawing, embodiment of the present utility model is elaborated.Should be understood that, embodiment described herein only, for description and interpretation the utility model, is not limited to the utility model.
Fig. 1 is the turbo generator earthing device composition structured flowchart according to the utility model execution mode.As shown in Figure 1, a kind of turbo generator earthing device 100 that the utility model provides, comprising: RC unit 101 and brush unit 102, and wherein said RC unit 101 is configured to one end ground connection, and the other end connects described brush unit 102; And described brush unit 102 is configured to electrically contact with the exciter end axle of described turbo generator.
Pass through technique scheme, between the exciter end axle of turbo generator and ground, RC unit 101 is set, utilize resistance in RC unit 101 effectively to eliminate electrostatic charge and reduce shaft current, and electric capacity can reduce the ratio of axle direct-to-ground capacitance voltage, reduces high frequency voltage peak value.
Fig. 2 is the turbo generator earthing device structural representation according to the utility model execution mode.For illustrative purpose, the contact position of the theory structure of RC unit 101 in Fig. 1 and earthing device 100 and the exciter end axle of turbo generator has been shown in Fig. 2, and the structure of not shown brush unit 102.Alternatively, brush unit 102 can have the general structure of this area center brush, for example, can comprise brush holder, brush carrier and brush (for example, carbon brush) etc.
In one embodiment, described RC unit 101 can comprise that resistance value in parallel can be that resistance R and the capacitance of 500 Ω can be the capacitor C of 10 μ F.500 Ω resistance can be limited in shaft current effectively within the scope of axle and the harmless several mA of bearing, and can prevent the foundation of DC potential, also can be limited in enough low degree even if set up DC potential.The electric capacity of 10 μ F, can prevent all shaft voltages that produced by static excitation effectively.In one embodiment, can obtain stoping for for example resistance of 500 Ω by slide rheostat, it be the equivalent capacity of 10 μ F that the Parallel-connected Capacitor that is 1 μ F by ten capacitances becomes capacitance.
In one embodiment, described brush unit 102 can comprise following element: brush holder, brush carrier and brush, and wherein said brush holder can be configured to fixing described brush carrier, and can be provided with insulating barrier between described brush holder and described brush carrier; And described brush carrier can be configured to grip described brush.The object that insulating barrier is set is to make brush and ground good insulation, for example, has the insulation resistance that is more than or equal to 0.5M Ω.One preferred embodiment in, described insulating barrier can be epoxy resin board.Epoxy resin board is insulating material conventional in a kind of industry, by its thickness is selected, can obtain the insulation resistance needing.Preferably, in the time that brush unit 102 is installed, can, by adjusting the installation site of brush holder and/or the thickness of insulating material, adjust brush carrier and brush by the gap between the exciter end axle of removing, for example 5mm, and ensure that brush moves freely in brush carrier.In addition, the elastic force of brush spring also should be adjusted, to ensure brush and exciter end axle good contact.
In order to ensure that brush contacts and make exciter end axle stress balance effectively, reliably with exciter end axle, in one embodiment, can comprise that according to turbo generator earthing device of the present utility model brush unit 102 described in 102, two groups of brush unit described in two groups is separately positioned on the journal centre both sides of described exciter end axle.One preferred embodiment in, two groups of brush unit 102 can be arranged on the position of relative 180 ° of the journal centre both sides of exciter end axle, every group of brush unit 102 comprises one group of brush holder, brush carrier and brush, and the brush of two groups of brush unit 102 can be connected with RC unit 101 after parallel connection.
Refer again to Fig. 2, it should be noted that, can in steam turbine main shaft side (generator vapour side), the ground brush device of macro-axis ground connection be combined with of the prior art according to the turbo generator earthing device of the utility model execution mode, in having obtained good technique effect, there is good equipment compatibility.
Fig. 3 is the turbo generator earthing method flow chart according to the utility model execution mode.As shown in Figure 3, a kind of turbo generator earthing method that the utility model execution mode provides, can comprise: S302 arranges RC unit and brush unit between the exciter end axle of turbo generator and ground; S304, configuration RC unit makes one end ground connection, and the other end connects brush unit; And S306, configuration brush unit electrically contacts the exciter end axle of itself and turbo generator.
Pass through technique scheme, between the exciter end axle of turbo generator and ground, RC unit is set, utilize resistance in RC unit effectively to eliminate electrostatic charge and reduce shaft current, and electric capacity can reduce the ratio of axle direct-to-ground capacitance voltage, reduces high frequency voltage peak value.
In one embodiment, the brush unit arranging in said method can comprise following element: brush holder, brush carrier and brush, wherein arrange described brush unit and comprise: described brush holder is configured to fixing described brush carrier; Between described brush holder and described brush carrier, insulating barrier is set, makes the insulating resistance value of described brush carrier be more than or equal to 0.5M Ω; And described brush carrier is configured to grip described brush.Preferably, wherein said insulating barrier is epoxy resin board.In one embodiment, can, by adjusting the thick insulating resistance value that obtains needs of insulating material, in method, can comprise that the thickness by adjusting described insulating barrier makes the insulating resistance value of brush carrier be more than or equal to 0.5M Ω.Wherein, can use the megger of 500V to measure insulating resistance value.
Turbo generator earthing device use being provided according to the utility model below in conjunction with an instantiation and the result of use of method describe.
The operational factor of certain generator in Liao Mou factory turbo generator set is shown in table 1.
Table 1
| Active power | Reactive power | Stator voltage | Rotor voltage | Rotor current |
| 250.2MW | 52.3MVAR | 24KV | 6270A | 1697.9A |
The magnitude of voltage at each bearing shell place and shaft current value have for example been shown in table 2, by after this generator steam turbine main shaft side (, locating for 7 watts) ground connection.
Table 2
Maintenance generator steam turbine main shaft side joint ground is shown in table 3, encourages side exciter end axle (for example, locating for 9 watts) at generator the turbo generator earthing device providing according to the utility model execution mode, the magnitude of voltage at each bearing shell place and shaft current value are provided simultaneously.
Table 3
Comparison sheet 2 and table 3, can find out, same generator used before and after the turbo generator earthing device that provides according to the utility model execution mode, and shaft voltage and shaft current reduced to effect obviously.Wherein shaft voltage is controlled at below 10V, lower than the puncture voltage of bearing shell oil film.Therefore, the turbo generator earthing device and the method that provide by the utility model can effectively reduce shaft voltage, eliminate electrostatic charge and reduce shaft current, and can reduce high frequency voltage peak value, ensure turbo generator set safe operation.
Below describe by reference to the accompanying drawings preferred implementation of the present utility model in detail; but; the utility model is not limited to the detail in above-mentioned execution mode; within the scope of technical conceive of the present utility model; can carry out multiple simple variant to the technical solution of the utility model, these simple variant all belong to protection range of the present utility model.
It should be noted that in addition each the concrete technical characterictic described in above-mentioned embodiment, in reconcilable situation, can combine by any suitable mode.For fear of unnecessary repetition, the utility model is to the explanation no longer separately of various possible compound modes.
In addition, also can carry out combination in any between various execution mode of the present utility model, as long as it is without prejudice to thought of the present utility model, it should be considered as content disclosed in the utility model equally.
Claims (5)
1. a turbo generator earthing device, this device comprises:
RC unit and brush unit, wherein
Described RC unit is configured to one end ground connection, and the other end connects described brush unit; And
Described brush unit is configured to electrically contact with the exciter end axle of described turbo generator.
2. device according to claim 1, wherein, described brush unit comprises following element: brush holder, brush carrier and brush, wherein
Described brush holder is configured to fixing described brush carrier, and is provided with insulating barrier between described brush holder and described brush carrier; And
Described brush carrier is configured to grip described brush.
3. device according to claim 2, wherein said insulating barrier is epoxy resin board.
4. device according to claim 2, wherein said device comprise two groups described in brush unit, described in two groups, brush unit is separately positioned on the journal centre both sides of described exciter end axle.
5. device according to claim 1, wherein, described RC unit comprises that resistance value in parallel is that resistance R and the capacitance of 500 Ω is the capacitor C of 10 μ F.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320824335.6U CN203660770U (en) | 2013-12-12 | 2013-12-12 | Grounding device for steam-turbine generator |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320824335.6U CN203660770U (en) | 2013-12-12 | 2013-12-12 | Grounding device for steam-turbine generator |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203660770U true CN203660770U (en) | 2014-06-18 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201320824335.6U Expired - Lifetime CN203660770U (en) | 2013-12-12 | 2013-12-12 | Grounding device for steam-turbine generator |
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| Country | Link |
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| CN (1) | CN203660770U (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103683687A (en) * | 2013-12-12 | 2014-03-26 | 中国神华能源股份有限公司 | Turbonator grounding device and method |
| CN105548655A (en) * | 2015-12-07 | 2016-05-04 | 辽宁东科电力有限公司 | Device for monitoring and controlling shaft voltage and shaft current of turbo-generator online |
| CN110954753A (en) * | 2019-11-26 | 2020-04-03 | 中广核核电运营有限公司 | Device and method for measuring insulation to ground of excitation end sealing tile of generator |
-
2013
- 2013-12-12 CN CN201320824335.6U patent/CN203660770U/en not_active Expired - Lifetime
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103683687A (en) * | 2013-12-12 | 2014-03-26 | 中国神华能源股份有限公司 | Turbonator grounding device and method |
| CN105548655A (en) * | 2015-12-07 | 2016-05-04 | 辽宁东科电力有限公司 | Device for monitoring and controlling shaft voltage and shaft current of turbo-generator online |
| CN110954753A (en) * | 2019-11-26 | 2020-04-03 | 中广核核电运营有限公司 | Device and method for measuring insulation to ground of excitation end sealing tile of generator |
| CN110954753B (en) * | 2019-11-26 | 2021-12-14 | 中广核核电运营有限公司 | Device and method for measuring insulation to ground of excitation end sealing tile of generator |
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| Date | Code | Title | Description |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term | ||
| CX01 | Expiry of patent term |
Granted publication date: 20140618 |