CN205880074U - Detect macroaxis ground connection carbon brush contact failure's equipment - Google Patents
Detect macroaxis ground connection carbon brush contact failure's equipment Download PDFInfo
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- CN205880074U CN205880074U CN201620642544.2U CN201620642544U CN205880074U CN 205880074 U CN205880074 U CN 205880074U CN 201620642544 U CN201620642544 U CN 201620642544U CN 205880074 U CN205880074 U CN 205880074U
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- voltage
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- resistance
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- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 title claims abstract description 47
- 229910052799 carbon Inorganic materials 0.000 title claims abstract description 47
- 238000004804 winding Methods 0.000 claims abstract description 25
- 238000002347 injection Methods 0.000 claims abstract description 9
- 239000007924 injection Substances 0.000 claims abstract description 9
- 238000005259 measurement Methods 0.000 claims abstract description 5
- 239000003990 capacitor Substances 0.000 claims description 9
- 230000005611 electricity Effects 0.000 claims description 8
- 238000001802 infusion Methods 0.000 claims description 6
- 238000009413 insulation Methods 0.000 description 7
- 238000000034 method Methods 0.000 description 6
- 230000007257 malfunction Effects 0.000 description 5
- 238000001514 detection method Methods 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 230000008901 benefit Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000004458 analytical method Methods 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 230000003467 diminishing effect Effects 0.000 description 1
- 235000013399 edible fruits Nutrition 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 230000001681 protective effect Effects 0.000 description 1
- 239000004575 stone Substances 0.000 description 1
- 230000001360 synchronised effect Effects 0.000 description 1
Abstract
The utility model relates to an electric power tech field discloses a detect macroaxis ground connection carbon brush contact failure's equipment, its condition that can effectively differentiate macroaxis carbon brush contact failure. Should be used for detect macroaxis ground connection carbon brush contact failure's equipment to include: pour into the power into for to wheatstone bridge input voltage, this wheatstone bridge regards as four arms in order to pour into resistance R1 into, to pour into resistance R2, electric capacity cr and electric capacity cx into, and wherein electric capacity cr contains the distributed capacitance between rotor winding and the macroaxis ground connection carbon brush and pours into the additional electric capacity in return circuit into, electric capacity cx have and the capacitance value that electric capacity cr is the same, the resistance of pouring into resistance R1 and injection resistance R2 into is the same, the voltage measurement device for measuring voltage UCB and voltage UDB, and the treater, be used for voltage UCB be greater than when voltage UDB and both differences are greater than a default, confirm macroaxis ground connection carbon brush contact failure.
Description
Technical field
This utility model relates to technical field of electric power, in particular it relates to the big axle grounding carbon brush loose contact of a kind of detection sets
Standby.
Background technology
Current rotor one-point grounding protection can be divided into the protection of non-implanted formula and pouring-in protection two big according to the difference of principle
Class.The protection of non-implanted formula relies on the voltage of Exciting Windings for Transverse Differential Protection itself or the magnitude of current as the basic parameter of Protection criteria；Pouring-in guarantor
Protect, need additional accessory power supply, this accessory power supply the voltage or the magnitude of current calculating Protection criteria is injected rotor, with
This basic parameter calculated as protection.
Pouring-in protection mainly exchanges pouring-in as representative with domestic Square wave injection formula with external, and each manufacturing firm is all
There is corresponding product.Square wave injection formula principle mainly by a power supply that can produce positive and negative square wave at generator amature winding
And inject between big axle loop.According to two states of positive and negative square wave, simultaneous Kirchoff s voltage equation respectively, thus be calculated
Rotor ground resistance and position.Exchange pouring-in be divided into Wheatstone bridge pouring-in and common exchange pouring-in.Before its difference is
Person passes through an electric capacity and rotor windings and the big axle that between with generator amature winding and big axle, distributed capacitance is identical
Loop constitutes two brachium pontis of Wheatstone bridge, judges, according to the uneven degree of bridge, the degree that rotor windings insulation declines.
The latter's principle is that alternating current power supply directly injects rotor windings loop, according to electric current, the amplitude of voltage and phase place by resistance, electric capacity
Determine dielectric level.These three rotor earth fault protection can preferably detect in theory rotor windings insulation, but actually because of
For the existence of big axle grounding carbon brush contact resistance, and its shaft voltage change impact caused, protection value is the most excessive
Or too small, protection can tripping or malfunction.
The product of all big enterprises all cannot differentiate the situation of big axle carbon brush loose contact the most both at home and abroad, and big axle once occurs
Grounding carbon brush loose contact, the malfunction probability of protection is higher.
Utility model content
The purpose of this utility model is to provide a kind of equipment detecting big axle grounding carbon brush loose contact, and it can effectively differentiate
The situation of big axle carbon brush loose contact.
To achieve these goals, this utility model provides a kind of for detecting setting of big axle grounding carbon brush loose contact
Standby, this equipment includes: supply-injected, and for Wheatstone bridge input voltage, this Wheatstone bridge is to inject resistance R1, injection
Resistance R2, electric capacity Cr and electric capacity Cx are as four arms, and wherein electric capacity Cr comprises between rotor windings and big axle grounding carbon brush
Distribution capacity and infusion circuit additional capacitor, the capacitance of this electric capacity Cr is the distribution between rotor windings and big axle grounding carbon brush
Electric capacity and the equivalence value of infusion circuit additional capacitor sum, electric capacity Cx has and described capacitance identical for electric capacity Cr, injects electricity
The resistance of resistance R1 and injection resistance R2 is identical；Voltage measuring apparatus, is used for measuring voltage UCBAnd voltage UDB, wherein UCBRepresent electricity
Hold the voltage at Cr two ends, UDBRepresent the voltage at electric capacity Cx two ends；And processor, at described voltage UCBMore than described electricity
Pressure UDBAnd both differences more than a preset value time, determine described big axle grounding carbon brush loose contact.
Wherein, described processor is additionally operable at described UCBLess than described voltage UDBAnd both differences more than a preset value time,
Determine that rotor windings insulating properties reduces, and perform protection operation.
Wherein, described processor is used for: | UDB|-|UCB| ＞ Usetting1Time, perform operation of reporting to the police；And | UDB|-|
UCB| ＞ Usetting2Time, perform protection operation, wherein, Usetting1＜ Usetting2。
Wherein, described voltage measuring apparatus is additionally operable to measure voltage UCD, wherein this UCDRepresent the spirit of described Wheatstone bridge
Quick voltage；Described processor is at UCD>USTARTIn the case of, perform protection and start operation, and control described voltage measurement dress
Put the above-mentioned voltage U of executionCBAnd voltage UDBMeasurement operation and described big axle grounding carbon brush loose contact or rotor windings insulation
Property reduce decision.
Wherein, described processor, after determining described big axle grounding carbon brush loose contact, performs operation of reporting to the police, and locking
Described protection operation.
Wherein, described supply-injected frequency is not the integral multiple of 6.
By technique scheme, the situation of big axle grounding carbon brush loose contact can be distinguished, carry out locking tripping operation with this concurrent
Report to the police, the malfunction probability of protection can be substantially reduced.
Other features and advantages of the utility model will be described in detail in detailed description of the invention part subsequently.
Accompanying drawing explanation
Accompanying drawing is used to offer and is further appreciated by of the present utility model, and constitutes a part for description, with following
Detailed description of the invention be used for explaining this utility model together, but be not intended that restriction of the present utility model.In the accompanying drawings:
The circuit of the equipment for detecting big axle grounding carbon brush loose contact that Fig. 1 provides for this utility model one embodiment
Figure；
Fig. 2 is the equivalent circuit diagram in the case of there is rotor one point to ground fault of the circuit shown in Fig. 1；And
Fig. 3 is the equivalent circuit diagram in the case of there is big axle grounding carbon brush loose contact of the circuit shown in Fig. 1；And
The method flow diagram for detecting big axle grounding carbon brush loose contact that Fig. 4 provides for this utility model.
Detailed description of the invention
Below in conjunction with accompanying drawing, detailed description of the invention of the present utility model is described in detail.It should be appreciated that herein
Described detailed description of the invention is merely to illustrate and explains this utility model, is not limited to this utility model.
The circuit of the equipment for detecting big axle grounding carbon brush loose contact that Fig. 1 provides for this utility model one embodiment
Figure.As it is shown in figure 1, this utility model provides a kind of equipment for detecting big axle grounding carbon brush loose contact, this equipment bag
Including: supply-injected Us (it can be that high frequency is supply-injected), for Wheatstone bridge input voltage, this Wheatstone bridge is to inject
Resistance R1, (capacitance of this electric capacity Cx is adjustable, with the electric capacity with electric capacity Cr to inject resistance R2, electric capacity Cr and electric capacity Cx
It is worth equal) as four arms, wherein electric capacity Cr comprises the distribution capacity between rotor windings and big axle grounding carbon brush (time normal
The insulation of rotor windings and big axle is good, it is believed that infinite, because rotor windings and big between centers have distribution capacity during theory analysis
Existing, loop the most between the two presents capacitive) and infusion circuit additional capacitor, the capacitance of this electric capacity Cr is rotor windings
And the distribution capacity between big axle grounding carbon brush and the equivalence value of infusion circuit additional capacitor sum, electric capacity Cx has and described electricity
Hold the identical capacitance of Cr, inject resistance R1 and inject the resistance identical (difference of both resistances is not to be exceeded 0.5%) of resistance R2；
Voltage measuring apparatus (not shown), is used for measuring voltage UCBAnd voltage UDB, wherein UCBRepresent the voltage at electric capacity Cr two ends,
UDBRepresent the voltage at electric capacity Cx two ends；And processor (not shown), at described voltage UCBMore than described voltage UDB
And both differences more than a preset value time, determine described big axle grounding carbon brush loose contact.
Preferably, exchange of the present utility model is supply-injected does not use 50Hz power frequency supply (because 50Hz power frequency supply is easy
Disturbed by shaft voltage, electric bridge can be aggravated uneven), and use 100Hz high frequency electric source, because rectification energized circuit has the biggest 6
Order harmonic components, so the power supply of 6Nfn frequency need to be avoided using.
Foregoing circuit of the present utility model is modified model based on Wheatstone bridge, utilizes rotor windings and big axle carbon brush electricity
The voltage-phase difference that resistive causes comes district in two kinds of situation, thus realizes big axle grounding carbon brush loose contact detection function.
Under normal circumstances, because impedance is roughly equal between brachium pontis, whole electric bridge is in poised state, measures terminal voltage UCD(that is, described favour
The sense voltage of stone electric bridge) the least.When there is rotor one point to ground fault, rotor windings can diminish with the equiva lent impedance of big between centers,
Being equivalent to one earth resistance Rg of parallel connection, the most directly reaction is exactly Wheatstone bridge disequilibrium, measures terminal voltage UCDMeeting
(as shown in Figure 2) is significantly increased along with diminishing of earth resistance.Because there is ground connection, the equiva lent impedance of this brachium pontis in rotor windings
Reduce, reflect in electric bridge, it is simply that UCDIt is not equal to 0, and UCBAmplitude less than UDBAmplitude.When rotor insulation is good, and big axle
During grounding carbon brush loose contact, rotor loop is equivalent to the contact resistance Rz changed that connected, and the impedance of this brachium pontis can increase
Greatly, reflect in electric bridge, be also UCDIt is not 0, UCBAmplitude more than UDB(as shown in Figure 3).
This utility model can establish a set of brand-new protection act logic according to above-mentioned voltage measurements.Concrete and
Speech, as shown in Figure 4:
At UCD>USTARTIn the case of, perform protection and start operation；
| UDB|-|UCB| ＞ UsettingIn the case of, perform protection operation (such as, performing trip operation)；Wherein, should
UsettingMay be configured as two-part, I section acts on warning, and II section acts on protection operation.Such as, exist | UDB|-|UCB| ＞
Usetting1Time, perform operation of reporting to the police；And | UDB|-|UCB| ＞ Usetting2Time, perform protection operation.
| UCB|-|UDB| ＞ UalarmIn the case of, perform operation of reporting to the police, and locking protection operation.
Specific operation process of the present utility model introduced below:
First by the alternating-current voltage source of supply-injected one frequency 100Hz amplitude 40V of generation, A, B end (its of electric bridge is injected
In, use 100Hz frequency alternating current can avoid armature spindle voltage and the interference of rectification harmonic voltage, make measured value more be as the criterion
Really).When electromotor reaches synchronous rotational speed, boost to unloaded specified time, regulate tunable capacitor Cx, make UCBApproximate UDB, UCDIt is about
0.It follows that electric bridge sense voltage UCDAs having protected momentum, once there is big axle loose contact or rotor insulation change, all
Bridge balance, U can be destroyedCDU will be much higher thanSTART, protection can reliably start.If it occur that be rotor insulation reduce, its knot
Fruit necessarily UDBAmplitude is more than UCBAmplitude, by the suitable U that adjustssettingProtection action message can be made,Time, perform operation of reporting to the police；And | UDB|-|UCB| ＞ Usetting2Time, perform protection operation.If sending out
Raw is big axle grounding carbon brush imperfect earth, the most necessarily UCBAmplitude is more than UDBAmplitude, by the suitable U that adjustsalarmMake protection
Send alarm, remind operations staff's big axle carbon brush loose contact, and latch-up protection outlet.This utility model is by comparing voltage amplitude
The size of value realizes relay protective scheme and is typically simple and reliable, it is to avoid compare voltage-phase change at accuracy, anti-interference
The new problem that property and realizability aspect are brought.
Accordingly, as shown in Figure 4, this utility model additionally provides a kind of for detecting big axle grounding carbon brush loose contact
Method, the method includes: to Wheatstone bridge input voltage, and this Wheatstone bridge is to inject resistance R1, to inject resistance R2, electricity
Hold Cr and electric capacity Cx as four arms, wherein electric capacity Cr comprise the distribution capacity between rotor windings and big axle grounding carbon brush and
Infusion circuit additional capacitor, the capacitance of this electric capacity Cr is the distribution capacity between rotor windings and big axle grounding carbon brush and injection
The equivalence value of loop additional capacitor sum, electric capacity Cx has and described capacitance identical for electric capacity Cr, injects resistance R1 and injection
The resistance of resistance R2 is identical；Measure voltage UCBAnd voltage UDB, wherein UCBRepresent the voltage at electric capacity Cr two ends, UDBRepresent electric capacity Cx
The voltage at two ends；And at described voltage UCBMore than described voltage UDBAnd both differences more than a preset value time, determine described greatly
Axle grounding carbon brush loose contact.About detail and the benefit of the method, see the big axle grounding carbon brush of above-mentioned relevant detection
The description of the equipment of loose contact, repeats no more in this.
Compared to cannot be distinguished by the unusual service condition of big axle carbon brush loose contact in prior art, this utility model can be sent out in time
The fault of the biggest axle grounding carbon brush loose contact, removes a hidden danger in time for field personnel and submits necessary information, from the biggest
Reduce carbon brush loose contact in degree and affect this great difficult problem of protection act accuracy so that generator rotor ground is protected
Really stop malfunction.Owing to protection structure is simple, criterion clear, clearly, it is high that this utility model has reliability, and malfunction rate is low,
Therefore there is good using value.
Preferred implementation of the present utility model is described in detail above in association with accompanying drawing, but, this utility model does not limit
Detail in above-mentioned embodiment, in technology concept of the present utility model, can be to skill of the present utility model
Art scheme carries out multiple simple variant, and these simple variant belong to protection domain of the present utility model.
It is further to note that each the concrete technical characteristic described in above-mentioned detailed description of the invention, at not lance
In the case of shield, can be combined by any suitable means.In order to avoid unnecessary repetition, this utility model is to respectively
Plant possible compound mode to illustrate the most separately.
Additionally, combination in any can also be carried out, as long as it is not disobeyed between various different embodiment of the present utility model
Carrying on the back thought of the present utility model, it should be considered as content disclosed in the utility model equally.
Claims (6)
1. the equipment being used for detecting big axle grounding carbon brush loose contact, it is characterised in that this equipment includes:
Supply-injected, for Wheatstone bridge input voltage, this Wheatstone bridge is to inject resistance R1, to inject resistance R2, electricity
Hold Cr and electric capacity Cx as four arms, wherein electric capacity Cr comprise the distribution capacity between rotor windings and big axle grounding carbon brush and
Infusion circuit additional capacitor, the capacitance of this electric capacity Cr is the distribution capacity between rotor windings and big axle grounding carbon brush and injection
The equivalence value of loop additional capacitor sum, electric capacity Cx has and described capacitance identical for electric capacity Cr, injects resistance R1 and injection
The resistance of resistance R2 is identical；
Voltage measuring apparatus, is used for measuring voltage UCBAnd voltage UDB, wherein UCBRepresent the voltage at electric capacity Cr two ends, UDBRepresent electricity
Hold the voltage at Cx two ends；And
Processor, at described voltage UCBMore than described voltage UDBAnd both differences more than a preset value time, determine described greatly
Axle grounding carbon brush loose contact.
Equipment the most according to claim 1, it is characterised in that described processor is additionally operable at described UCBLess than described voltage
UDBAnd both differences more than a preset value time, determine that rotor windings insulating properties reduces, and perform protection operate.
Equipment the most according to claim 2, it is characterised in that described processor is used for:
| UDB|-|UCB| ＞ Usetting1Time, perform operation of reporting to the police；And
| UDB|-|UCB| ＞ Usetting2Time, perform protection operation,
Wherein, Usetting1＜ Usetting2。
Equipment the most according to claim 2, it is characterised in that
Described voltage measuring apparatus is additionally operable to measure voltage UCD, wherein this UCDRepresent the sense voltage of described Wheatstone bridge；
Described processor is at UCD>USTARTIn the case of, perform protection and start operation, and control described voltage measuring apparatus and hold
The above-mentioned voltage U of rowCBAnd voltage UDBMeasurement operation and described big axle grounding carbon brush loose contact or rotor windings insulating properties fall
Low decision.
Equipment the most according to claim 4, it is characterised in that described processor is determining that described big axle grounding carbon brush contacts
After bad, perform operation of reporting to the police, and protection operation described in locking.
Equipment the most according to claim 1, it is characterised in that described supply-injected frequency is not the integral multiple of 6.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620642544.2U CN205880074U (en) | 2016-06-24 | 2016-06-24 | Detect macroaxis ground connection carbon brush contact failure's equipment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620642544.2U CN205880074U (en) | 2016-06-24 | 2016-06-24 | Detect macroaxis ground connection carbon brush contact failure's equipment |
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| Publication Number | Publication Date |
|---|---|
| CN205880074U true CN205880074U (en) | 2017-01-11 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201620642544.2U Active CN205880074U (en) | 2016-06-24 | 2016-06-24 | Detect macroaxis ground connection carbon brush contact failure's equipment |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105974241A (en) * | 2016-06-24 | 2016-09-28 | 中国神华能源股份有限公司 | Method and equipment for detecting contact failure of major axis grounding carbon brush |
| US11569712B2 (en) | 2021-04-05 | 2023-01-31 | General Electric Renovables Espana, S.L. | System and method for detecting bearing insulation and ground brush health in a generator |
-
2016
- 2016-06-24 CN CN201620642544.2U patent/CN205880074U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105974241A (en) * | 2016-06-24 | 2016-09-28 | 中国神华能源股份有限公司 | Method and equipment for detecting contact failure of major axis grounding carbon brush |
| US11569712B2 (en) | 2021-04-05 | 2023-01-31 | General Electric Renovables Espana, S.L. | System and method for detecting bearing insulation and ground brush health in a generator |
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| GR01 | Patent grant |