CN105182201B - Generator stator bar state of insulation assessment method based on low-voltage and multi-parameter - Google Patents
Generator stator bar state of insulation assessment method based on low-voltage and multi-parameter Download PDFInfo
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- CN105182201B CN105182201B CN201510631719.XA CN201510631719A CN105182201B CN 105182201 B CN105182201 B CN 105182201B CN 201510631719 A CN201510631719 A CN 201510631719A CN 105182201 B CN105182201 B CN 105182201B
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Abstract
The invention discloses the generator stator bar state of insulation assessment method based on low-voltage and multi-parameter, including subject generator stator bar dielectric is attached with DC experiment power supply, DC experiment power supply is connected by charge switch and subject generator stator bar dielectric, and discharge switch and subject generator stator bar dielectric are in parallel；Before test, charge switch and discharge switch are in off-state, and subject generator stator bar dielectric thoroughly discharges, and presets maximum charging voltage and charging interval and discharge time；During test, first to being charged to subject generator stator bar dielectric, then discharged, record and occur the voltage peak that maximum voltage value is charge and discharge electric test during this；Generator stator bar state of insulation is tested and assessed according to the voltage peak of each charge and discharge electric test and charging interval.The assessment method is measured using low-voltage, simple to operate, to generator stator bar insulation without destructiveness.
Description
Technical field
The present invention relates to high voltage electric equipment Condition assessment of insulation field, in particular to the hair based on low-voltage and multi-parameter
Stator winding conductor bars in electrical machines state of insulation assessment method.
Background technology
With China's rapid development of economy, power industry is also rapidly progressed, and total amount of installing and generated energy enter one
Step increases, and power network scale gradually expands.The state of insulation of high-rating generator is correctly assessed, works out scientific and reasonable fortune
Row, repair schedule, be advantageous to safeguard generator operation safety, improve generating efficiency, lift the security reliability of operation of power networks.
The insulation degree of insulating materials is the key factor for the safe operation and service life for determining high-rating generator.Mesh
Before, it is mainly resistance to including insulation measurement, dielectric loss measurement, exchange for the traditional experiment of generator stator bar insulation
Pressure, DC break down voltage etc..They are reduction generator accident, ensure that safe operation of power system has played positive effect.
But all there is shortcoming and defect for above-mentioned various methods：A partial experiment needs to apply high voltage, high-potting
In the presence of the hidden danger that damage is caused to generator stator bar insulation, therefore the company of the foreign countries such as Siemens to scene it is not recommended that put into operation
Generator carry out this kind of high-potting；Result of the test information is single, only to a certain of generator stator bar state of insulation
Aspect is assessed, such as, shelf depreciation can only find dissociation and local defect in insulant air-gap, but can not send out
Existing apparatus insulated general defect, medium loss test mainly reflects apparatus insulated general defect, and local defect is reflected
It is insensitive.
When therefore, using conventional method, if the integrality that to be insulated to generator stator bar is assessed, need
Multiple different high-pottings are carried out, this has certain destructiveness in itself to generator stator bar insulation, and test process is also
In the presence of certain security risk.
The content of the invention
It is an object of the invention to provide the generator stator bar state of insulation assessment method based on low-voltage and multi-parameter,
The assessment method is simple to operate, and only generator stator bar, which need to be insulated, applies relatively low voltage, it becomes possible to generator unit stator
Bar insulation state accurately test and assess, to generator stator bar insulation without destructiveness.
What the above-mentioned purpose of the present invention was realized by following technical solution：Generator based on low-voltage and multi-parameter is determined
Sub-line rod state of insulation assessment method, it is characterised in that the assessment method comprises the following steps：
(1) subject generator stator bar dielectric Cx and DC experiment power supply Ud is attached, DC experiment electricity
Source Ud is determined by charge switch K1 and the Cx series connection of subject generator stator bar dielectric, discharge switch K2 and subject generator
Sub-line rod dielectric Cx is in parallel；
(2) before being tested, charge switch K1 and discharge switch K2 are in off-state, are tested generator unit stator line
Rod dielectric Cx thoroughly discharges, and presets maximum charging voltage UcmaxWith charging interval tc and discharge time td；
(3) when test starts, charge switch K1 is closed, to subject generator stator bar dielectric Cx to preset
Good maximum charging voltage UcmaxCharged；
(4) after charging interval tc chargings, charge switch K1 is opened, while discharge switch K2 is closed, to subject
Generator stator bar dielectric Cx is discharged；
(5) discharge switch K2 is opened after discharge time td electric discharges again, while using voltage-measuring equipment to subject
The voltage at generator stator bar dielectric Cx both ends carries out whole measurement, until being tested generator stator bar dielectric
The voltage at Cx both ends is reduced to 0V, and in the process, the voltage at subject generator stator bar dielectric Cx both ends can have one
It is individual first to raise the process reduced afterwards, record and occur the voltage peak U that maximum voltage value is charge and discharge electric test during thisRmax；
(6) at least ten charge and discharge electric tests and voltage measurement, note are carried out to subject generator stator bar dielectric Cx
Record the voltage peak U of each charge and discharge electric testRmaxWith charging interval tc, the electricity of multiple charge and discharge electric test is drawn according to record data
Voltage crest value URmaxWith charging interval tc graph of relation；
(7) the voltage peak U of the charge and discharge electric test obtained according to step (6)RmaxWith charging interval tc graph of relation,
Generator stator bar state of insulation is tested and assessed.
The assessment method of the present invention, before test starts, according to the situation of generator, it is determined that suitable DC charging voltage,
Charging interval and discharge time；When test starts, charge switch is closed first, DC voltage insulate to generator stator bar
Medium is charged；After charging after a while, charge switch is disconnected, while discharge switch is closed, to generator
Stator bar dielectric is discharged；After the electric discharge of set time, discharge switch is opened, while uses voltage measurement
Instrument measures to the voltage at subject generator stator bar dielectric both ends, until subject generator stator bar insulation
The voltage at medium both ends is reduced to zero.
The voltage at subject generator stator bar dielectric both ends has one and first raises the process reduced again, therefore meeting
There is a voltage peak.By the Insulation test of multiple different discharge and recharge ageings, voltage peak and charging interval are obtained
Between relation curve, the curve can reflect the polarization characteristic of generator stator bar dielectric.By to the curve
Analysis can makes assessment to generator stator bar state of insulation.
Generator stator bar need to only be insulated in the experiment of the present invention and apply relatively low voltage, to generator stator bar
Insulation can be preferably supplemented the conventional method of Condition assessment of insulation without destructiveness.
Low-voltage in the present invention refers to that voltage is less than 3000V voltage.
In the present invention, in the step (2), maximum charging voltage is preset according to subject rated voltage
Ucmax, subject rated voltage is higher, then maximum charging voltage UcmaxIt is higher, maximum charging voltage UcmaxValue is in 2000V
In the range of~3000V；Charging interval tc set in advance be followed successively by 20ms, 50ms, 100ms, 200ms, 500ms, 1s, 2s, 5s,
10s, 20s, 50s, 100s, 200s, 500s, 1000s, discharge time td are charging interval tc half.
In the present invention, the step (7) concretely comprises the following steps to what generator stator bar state of insulation was tested and assessed：
If the voltage peak U of charge and discharge electric testRmaxIt is in rising trend with charging interval tc graph of relation, do not go out
Existing peak value, then judge that the generator stator bar state of insulation is good；
If the voltage peak U of charge and discharge electric testRmaxGraph of relation with charging interval tc is in first to rise to decline again, is gone out
An existing peak value, but the time that peak value occurs after 1s, then judge that the generator stator bar state of insulation is good；
If the voltage peak U of charge and discharge electric testRmaxThere are at least two peak values with charging interval tc graph of relation,
Then judge that generator stator bar insulation is made moist or the phenomenon of insulation ag(e)ing, peak value occur more in the presence of local, then by
The state of insulation for trying generator stator bar insulator is poorer；
If the voltage peak U of charge and discharge electric testRmaxGraph of relation with charging interval tc is in first to rise to decline again, is gone out
, there is the time of peak value before 1s in an existing peak value, then can determine whether generator stator bar insulation make moist in the presence of local or
The phenomenon of person's insulation ag(e)ing；Peak value time of occurrence is more early, then the state of insulation for being tested generator stator bar insulation is poorer.
In the present invention, the magnitude of voltage of the DC experiment power supply Ud is substantially met existing in the range of 2000V~3000V
The test requirements document of motor.
The generator stator bar state of insulation assessment method based on low-voltage and multi-parameter of the present invention, by setting most
Big charging voltage and discharge and recharge time, apply the experiment for being adapted to its dielectric feature and insulation system to generator stator bar
Voltage, the voltage at generator stator bar dielectric both ends is measured.Carry out multigroup charge and discharge electric test, generation voltage with
The polarization curve of time relationship, for generator stator bar Condition assessment of insulation.
The assessment method need to only insulate to generator stator bar applies nondestructive voltage, you can test is generated electricity
The multiple parameters of machine stator bar insulation, so as to effectively be assessed generator stator bar state of insulation.To generator
Insulation status diagnosed, grasp the running status of generator, to formulate scientific and rational generator operation, maintenance and
Renewal plan, to improving generator efficiency and operation of power networks reliability, is all significant.
Compared with prior art, it is of the invention to be tested and assessed based on the generator stator bar state of insulation of low-voltage and multi-parameter
Method, generator stator bar need to only be insulated and apply relatively low voltage, to generator stator bar insulation without destructiveness.
Test obtains the polarization curve of generator stator bar insulation, and the part to be insulated to generator stator bar is made moist or overall aging
State is effectively assessed.Condition assessment of insulation method provided by the invention can damage to such as insulaion resistance, shelf depreciation, medium
Traditional methods such as consumption are preferably supplemented.
Brief description of the drawings
The present invention is described in further detail with reference to the accompanying drawings and detailed description：
Fig. 1 is the theory diagram of assessment method of the present invention；
Fig. 2 is voltage waveform view when assessment method of the present invention carries out generator stator bar Insulation test；
Fig. 3 is the voltage peak U of charge and discharge electric test in assessment method embodiment one of the present inventionRmaxWith charging interval tc pass
It is curve map；
Fig. 4 is the voltage peak U of charge and discharge electric test in assessment method embodiment two of the present inventionRmaxWith charging interval tc pass
It is curve map；
Fig. 5 is the voltage peak U of charge and discharge electric test in assessment method embodiment three of the present inventionRmaxWith charging interval tc pass
It is curve map；
Fig. 6 is the voltage peak U of charge and discharge electric test in assessment method example IV of the present inventionRmaxWith charging interval tc pass
It is curve map.
The physical meaning of each parameter is in the application：
Ud-DC experiment power supply；Cx-subject generator stator bar dielectric；
K1-charge switch；K2-discharge switch；
Ucmax- maximum charging voltage； URmaxThe voltage peak of-charge and discharge electric test；
Tc-charging interval；Td-discharge time；
tR- recovery time；
Dielectric both ends apply DC voltage, will produce polarization phenomena.Short circuit insulation both ends after voltage are removed, then are insulated
Depolarization phenomenon occurs for surface.After the shorting stub for removing two interpolars, process of depolarization is still continuing, the beam constrained by polarization
Tie up electric charge and be changed into free charge, and a voltage is produced at insulation both ends, first raise and be reduced to zero again.Recovery time tRAnd charging
Certain relation is there are between time tc and discharge time td ", but is difficult to quantify.If tc is constant, td increases, then tRSubtract
It is small, if td is far longer than tc, tRLevel off to 0；Therefore regulation tc is more than td in the present invention, typically requires td=tc/2；At this
In the case of as defined in invention, generally speaking, tc is bigger, tRIt is bigger.
Embodiment
Embodiment one
As shown in figure 1, the generator stator bar state of insulation assessment method of the invention based on low-voltage and multi-parameter, should
Assessment method comprises the following steps：
(1) subject generator stator bar dielectric Cx and DC experiment power supply Ud is attached, DC experiment electricity
Source Ud magnitude of voltage is 3000V, and DC experiment power supply Ud passes through charge switch K1 and subject generator stator bar dielectric
Cx connects, and discharge switch K2 and subject generator stator bar dielectric Cx are in parallel；
(2) before being tested, charge switch K1 and discharge switch K2 are in off-state, are tested generator unit stator line
Rod dielectric Cx thoroughly discharges, and predefines maximum charging voltage UcmaxWith charging interval tc and discharge time td, wherein, most
Big charging voltage UcmaxFor 3000V, charging interval tc be followed successively by 20ms, 50ms, 100ms, 200ms, 500ms, 1s, 2s, 5s,
10s, 20s, 50s, 100s, 200s, 500s, 1000s, discharge time td be charging interval tc half, td=tc/2；
(3) when test starts, charge switch K1 is closed, to subject generator stator bar dielectric Cx to preset
Good maximum charging voltage UcmaxCharged；
(4) after charging interval tc chargings, charge switch K1 is opened, while discharge switch K2 is closed, to subject
Generator stator bar dielectric Cx is discharged；
(5) discharge switch K2 is opened after discharge time td electric discharges again, while using voltage-measuring equipment to subject
The voltage at generator stator bar dielectric Cx both ends carries out whole measurement, until being tested generator stator bar dielectric
The voltage at Cx both ends is reduced to 0V, and in the process, the voltage at subject generator stator bar dielectric Cx both ends can have one
It is individual first to raise the process reduced afterwards, record and occur the voltage peak U that maximum voltage value is charge and discharge electric test during thisRmax；
(6) 15 charge and discharge electric tests and voltage measurement are carried out to subject generator stator bar dielectric Cx, recorded
The voltage peak U of each charge and discharge electric testRmaxWith charging interval tc, record data is as shown in table 1, according to the record shown in table 1
Data draw the voltage peak U of multiple charge and discharge electric testRmaxWith charging interval tc graph of relation, the graph of relation is as schemed
Shown in 3；
Table 1：The voltage peak U of charge and discharge electric test in embodiment oneRmaxWith charging interval tc tables of data
| URmax(V) | tc | URmax(V) | tc | URmax(V) | |
| 20ms | 4.25 | 1s | 14.24 | 50s | 37.24 |
| 50ms | 5.50 | 2s | 16.70 | 100s | 42.25 |
| 100ms | 6.31 | 5s | 20.13 | 200s | 48.60 |
| 200ms | 7.74 | 10s | 25.40 | 500s | 57.55 |
| 500ms | 10.06 | 20s | 31.80 | 1000s | 63.25 |
(7) the voltage peak U of the charge and discharge electric test obtained according to step (6)RmaxWith charging interval tc graph of relation,
Generator stator bar state of insulation is tested and assessed.
As seen from Figure 3, the voltage peak U of charge and discharge electric testRmaxGraph of relation with charging interval tc is in rising
, there is not peak value in trend, then judges that the generator stator bar state of insulation is good.
As the conversion of the present embodiment, DC experiment power supply Ud magnitude of voltage can also according to different motors 2000V~
Value in the range of 3000V, for example take 2200V either 2500V or 2600V or 2800V etc..
As the conversion of the present embodiment, maximum charging voltage UcmaxValue can in the range of 2000V~3000V value,
For example take 2200V either 2500V or 2600V or 2800V etc.；Maximum is preset according to subject rated voltage
Charging voltage Ucmax, subject rated voltage is higher, then maximum charging voltage UcmaxIt is higher, maximum charging voltage UcmaxTake
Value is in the range of 2000V~3000V；Charging interval tc set in advance be followed successively by 20ms, 50ms, 100ms, 200ms, 500ms,
1s, 2s, 5s, 10s, 20s, 50s, 100s, 200s, 500s, 1000s, discharge time td are charging interval tc half.
Embodiment two
As shown in figure 1, the generator stator bar state of insulation assessment method of the invention based on low-voltage and multi-parameter, should
Assessment method comprises the following steps：
(1) subject generator stator bar dielectric Cx and DC experiment power supply Ud is attached, DC experiment electricity
Source Ud magnitude of voltage is 3000V, and DC experiment power supply Ud passes through charge switch K1 and subject generator stator bar dielectric
Cx connects, and discharge switch K2 and subject generator stator bar dielectric Cx are in parallel；(explanation：.)
(2) before being tested, charge switch K1 and discharge switch K2 are in off-state, are tested generator unit stator line
Rod dielectric Cx thoroughly discharges, and predefines maximum charging voltage UcmaxWith charging interval tc and discharge time td wherein, most
Big charging voltage UcmaxFor 3000V, charging interval tc be followed successively by 20ms, 50ms, 100ms, 200ms, 500ms, 1s, 2s, 5s,
10s, 20s, 50s, 100s, 200s, 500s, 1000s, discharge time td be charging interval tc half, td=tc/2；
(3) when test starts, charge switch K1 is closed, to subject generator stator bar dielectric Cx to preset
Good maximum charging voltage UcmaxCharged；
(4) after charging interval tc chargings, charge switch K1 is opened, while discharge switch K2 is closed, to subject
Generator stator bar dielectric Cx is discharged；
(5) discharge switch K2 is opened after discharge time td electric discharges again, while using voltage-measuring equipment to subject
The voltage at generator stator bar dielectric Cx both ends carries out whole measurement, until being tested generator stator bar dielectric
The voltage at Cx both ends is reduced to 0V, and in the process, the voltage at subject generator stator bar dielectric Cx both ends can have one
It is individual first to raise the process reduced afterwards, record and occur the voltage peak U that maximum voltage value is charge and discharge electric test during thisRmax；
(6) 15 charge and discharge electric tests and voltage measurement are carried out to subject generator stator bar dielectric Cx, recorded
The voltage peak U of each charge and discharge electric testRmaxWith charging interval tc, record data is as shown in table 2, according to the record shown in table 2
Data draw the voltage peak U of multiple charge and discharge electric testRmaxWith charging interval tc graph of relation, the graph of relation is as schemed
Shown in 4；
Table 2：The voltage peak U of charge and discharge electric test in embodiment twoRmaxWith charging interval tc tables of data
| tc | URmax(V) | tc | URmax(V) | tc | URmax(V) |
| 20ms | 2.10 | 1s | 7.62 | 50s | 182.00 |
| 50ms | 2.90 | 2s | 11.74 | 100s | 256.20 |
| 100ms | 3.16 | 5s | 18.50 | 200s | 243.00 |
| 200ms | 4.60 | 10s | 36.85 | 500s | 213.00 |
| 500ms | 5.98 | 20s | 60.24 | 1000s | 102.00 |
(7) the voltage peak URmax and charging interval tc of the charge and discharge electric test obtained according to step (6) relation curve
Figure, tests and assesses to generator stator bar state of insulation.
As seen from Figure 4, the voltage peak U of charge and discharge electric testRmaxWith charging interval tc graph of relation on first
Rise and decline again, a peak value occur, but the time that peak value occurs, in 100s, the time of appearance is later, then judges the generator
Stator bar state of insulation is good.
It should be noted simultaneously that the if voltage peak U of charge and discharge electric testRmaxWith charging interval tc graph of relation
Decline again in first rising, occur a peak value, but peak value occur time after 1s, then judge that the generator stator bar is exhausted
Edge is in good condition.
As the conversion of the present embodiment, DC experiment power supply Ud magnitude of voltage can also according to different motors 2000V~
Value in the range of 3000V, for example take 2200V either 2500V or 2600V or 2800V etc..
As the conversion of the present embodiment, maximum charging voltage UcmaxValue can in the range of 2000V~3000V value,
For example take 2200V either 2500V or 2600V or 2800V etc.；Maximum is preset according to subject rated voltage
Charging voltage Ucmax, subject rated voltage is higher, then maximum charging voltage UcmaxIt is higher, maximum charging voltage UcmaxTake
Value is in the range of 2000V~3000V；Charging interval tc set in advance be followed successively by 20ms, 50ms, 100ms, 200ms, 500ms,
1s, 2s, 5s, 10s, 20s, 50s, 100s, 200s, 500s, 1000s, discharge time td are charging interval tc half.
Embodiment three
As shown in figure 1, the generator stator bar state of insulation assessment method of the invention based on low-voltage and multi-parameter, should
Assessment method comprises the following steps：
(1) subject generator stator bar dielectric Cx and DC experiment power supply Ud is attached, DC experiment electricity
Source Ud magnitude of voltage is 3000V, and DC experiment power supply Ud passes through charge switch K1 and subject generator stator bar dielectric
Cx connects, and discharge switch K2 and subject generator stator bar dielectric Cx are in parallel；
(2) before being tested, charge switch K1 and discharge switch K2 are in off-state, are tested generator unit stator line
Rod dielectric Cx thoroughly discharges, and predefines maximum charging voltage UcmaxWith charging interval tc and discharge time td wherein, most
Big charging voltage UcmaxFor 3000V, charging interval tc be followed successively by 20ms, 50ms, 100ms, 200ms, 500ms, 1s, 2s, 5s,
10s, 20s, 50s, 100s, 200s, 500s, 1000s, discharge time td be charging interval tc half, td=tc/2；
(3) when test starts, charge switch K1 is closed, to subject generator stator bar dielectric Cx to preset
Good maximum charging voltage UcmaxCharged；
(4) after charging interval tc chargings, charge switch K1 is opened, while discharge switch K2 is closed, to subject
Generator stator bar dielectric Cx is discharged；
(5) discharge switch K2 is opened after discharge time td electric discharges again, while using voltage-measuring equipment to subject
The voltage at generator stator bar dielectric Cx both ends carries out whole measurement, until being tested generator stator bar dielectric
The voltage at Cx both ends is reduced to 0V, and in the process, the voltage at subject generator stator bar dielectric Cx both ends can have one
It is individual first to raise the process reduced afterwards, record and occur the voltage peak U that maximum voltage value is charge and discharge electric test during thisRmax；
(6) 15 charge and discharge electric tests and voltage measurement are carried out to subject generator stator bar dielectric Cx, recorded
The voltage peak U of each charge and discharge electric testRmaxWith charging interval tc, the voltage of multiple charge and discharge electric test is drawn according to record data
Peak value URmaxIt is as shown in Figure 5 with charging interval tc graph of relation, the graph of relation；
(7) the voltage peak U of the charge and discharge electric test obtained according to step (6)RmaxWith charging interval tc graph of relation,
Generator stator bar state of insulation is tested and assessed.
As seen from Figure 5, the voltage peak U of charge and discharge electric testRmaxOccur two with charging interval tc graph of relation
Individual peak value, then judge that generator stator bar insulation is made moist in the presence of part or the phenomenon of insulation ag(e)ing, peak value appearance are got over
More, then the state of insulation for being tested generator stator bar insulator is poorer.
It should be noted simultaneously that the if voltage peak U of charge and discharge electric testRmaxWith charging interval tc graph of relation
There are at least two peak values, then judge that generator stator bar insulation is made moist or the phenomenon of insulation ag(e)ing in the presence of local, peak
Value occurs more, then the state of insulation for being tested generator stator bar insulator is poorer.
As the conversion of the present embodiment, DC experiment power supply Ud magnitude of voltage can also according to different motors 2000V~
Value in the range of 3000V, for example take 2200V either 2500V or 2600V or 2800V etc..
As the conversion of the present embodiment, maximum charging voltage UcmaxValue can in the range of 2000V~3000V value,
For example take 2200V either 2500V or 2600V or 2800V etc.；Maximum is preset according to subject rated voltage
Charging voltage Ucmax, subject rated voltage is higher, then maximum charging voltage UcmaxIt is higher, maximum charging voltage UcmaxTake
Value is in the range of 2000V~3000V；Charging interval tc set in advance be followed successively by 20ms, 50ms, 100ms, 200ms, 500ms,
1s, 2s, 5s, 10s, 20s, 50s, 100s, 200s, 500s, 1000s, discharge time td are charging interval tc half.
Example IV
As shown in figure 1, the generator stator bar state of insulation assessment method of the invention based on low-voltage and multi-parameter, should
Assessment method comprises the following steps：
(1) subject generator stator bar dielectric Cx and DC experiment power supply Ud is attached, DC experiment electricity
Source Ud magnitude of voltage is 3000V, and DC experiment power supply Ud passes through charge switch K1 and subject generator stator bar dielectric
Cx connects, and discharge switch K2 and subject generator stator bar dielectric Cx are in parallel；
(2) before being tested, charge switch K1 and discharge switch K2 are in off-state, are tested generator unit stator line
Rod dielectric Cx thoroughly discharges, and predefines maximum charging voltage UcmaxWith charging interval tc and discharge time td wherein, most
Big charging voltage UcmaxFor 3000V, charging interval tc be followed successively by 20ms, 50ms, 100ms, 200ms, 500ms, 1s, 2s, 5s,
10s, 20s, 50s, 100s, 200s, 500s, 1000s, discharge time td be charging interval tc half, td=tc/2；
(3) when test starts, charge switch K1 is closed, to subject generator stator bar dielectric Cx to preset
Good maximum charging voltage UcmaxCharged；
(4) after charging interval tc chargings, charge switch K1 is opened, while discharge switch K2 is closed, to subject
Generator stator bar dielectric Cx is discharged；
(5) discharge switch K2 is opened after discharge time td electric discharges again, while using voltage-measuring equipment to subject
The voltage at generator stator bar dielectric Cx both ends carries out whole measurement, until being tested generator stator bar dielectric
The voltage at Cx both ends is reduced to 0V, and in the process, the voltage at subject generator stator bar dielectric Cx both ends can have one
It is individual first to raise the process reduced afterwards, record and occur the voltage peak U that maximum voltage value is charge and discharge electric test during thisRmax；
(6) 15 charge and discharge electric tests and voltage measurement are carried out to subject generator stator bar dielectric Cx, recorded
The voltage peak U of each charge and discharge electric testRmaxWith charging interval tc, the voltage of multiple charge and discharge electric test is drawn according to record data
Peak value URmaxIt is as shown in Figure 6 with charging interval tc graph of relation, the graph of relation；
(7) the voltage peak U of the charge and discharge electric test obtained according to step (6)RmaxWith charging interval tc graph of relation,
Generator stator bar state of insulation is tested and assessed.
As seen from Figure 6, the voltage peak U of charge and discharge electric testRmaxWith charging interval tc graph of relation on first
Rise and decline again, a peak value occur, the time of peak value occur before 1s, peak value occurs relatively early, then can determine whether the generator
Stator bar insulation is made moist in the presence of part or the phenomenon of insulation ag(e)ing.Peak value time of occurrence is more early simultaneously, then explanation subject hair
The state of insulation of stator winding conductor bars in electrical machines insulation is poorer.
As the conversion of the present embodiment, DC experiment power supply Ud magnitude of voltage can also according to different motors 2000V~
Value in the range of 3000V, for example take 2200V either 2500V or 2600V or 2800V etc..
As the conversion of the present embodiment, maximum charging voltage UcmaxValue can in the range of 2000V~3000V value,
For example take 2200V either 2500V or 2600V or 2800V etc.；Maximum is preset according to subject rated voltage
Charging voltage Ucmax, subject rated voltage is higher, then maximum charging voltage UcmaxIt is higher, maximum charging voltage UcmaxTake
Value is in the range of 2000V~3000V；Charging interval tc set in advance be followed successively by 20ms, 50ms, 100ms, 200ms, 500ms,
1s, 2s, 5s, 10s, 20s, 50s, 100s, 200s, 500s, 1000s, discharge time td are charging interval tc half.
The present invention is not limited to above-mentioned embodiment, according to the above, according to the ordinary technical knowledge of this area
And customary means, under the premise of the above-mentioned basic fundamental thought of the present invention is not departed from, the present invention can also make other diversified forms
Equivalent modifications, replacement or change, all fall among protection scope of the present invention.
Claims (3)
1. the generator stator bar state of insulation assessment method based on low-voltage and multi-parameter, it is characterised in that the test and appraisal side
Method comprises the following steps：
(1) subject generator stator bar dielectric Cx and DC experiment power supply Ud is attached, DC experiment power supply Ud
By charge switch K1 and the Cx series connection of subject generator stator bar dielectric, discharge switch K2 and subject generator unit stator line
Rod dielectric Cx is in parallel；
(2) before being tested, charge switch K1 and discharge switch K2 are in off-state, and subject generator stator bar is exhausted
Edge medium Cx is thoroughly discharged, and maximum charging voltage U is preset according to subject rated voltagecmaxWith charging interval tc
With discharge time td；
(3) when test starts, charge switch K1 is closed, to subject generator stator bar dielectric Cx with pre-set
Maximum charging voltage UcmaxCharged；
(4) after charging interval tc chargings, charge switch K1 is opened, while discharge switch K2 is closed, subject is generated electricity
Machine stator bar insulation medium Cx is discharged；
(5) discharge switch K2 is opened after discharge time td electric discharges again, while subject generated electricity using voltage-measuring equipment
The voltage at machine stator bar insulation medium Cx both ends carries out whole measurement, until being tested generator stator bar dielectric Cx two
The voltage at end is reduced to 0V, and in the process, the voltage at subject generator stator bar dielectric Cx both ends can have an elder generation
The process reduced after rise, record and occur the voltage peak U that maximum voltage value is charge and discharge electric test during thisRmax；
(6) at least ten charge and discharge electric tests and voltage measurement is carried out to subject generator stator bar dielectric Cx, record is every
The voltage peak U of secondary charge and discharge electric testRmaxWith charging interval tc, the Voltage Peak of multiple charge and discharge electric test is drawn according to record data
Value URmaxWith charging interval tc graph of relation；
(7) the voltage peak U of the charge and discharge electric test obtained according to step (6)RmaxWith charging interval tc graph of relation, to hair
Stator winding conductor bars in electrical machines state of insulation is tested and assessed, and is concretely comprised the following steps：
If the voltage peak U of charge and discharge electric testRmaxIt is in rising trend with charging interval tc graph of relation, there is not peak
Value, then judge that the generator stator bar state of insulation is good；
If the voltage peak U of charge and discharge electric testRmaxGraph of relation with charging interval tc is in first to rise to decline again, occurs one
Individual peak value, but peak value occur time after 1s, then judge that the generator stator bar state of insulation is good；
If the voltage peak U of charge and discharge electric testRmaxThere are at least two peak values with charging interval tc graph of relation, then sentence
Generator stator bar insulation of breaking is made moist in the presence of part or the phenomenon of insulation ag(e)ing, peak value occur more, then subject hair
The state of insulation of stator winding conductor bars in electrical machines insulator is poorer；
If the voltage peak U of charge and discharge electric testRmaxGraph of relation with charging interval tc is in first to rise to decline again, occurs one
Individual peak value, there is the time of peak value before 1s, then can determine whether that generator stator bar insulation is made moist or absolutely in the presence of local
The phenomenon of edge aging；Peak value time of occurrence is more early, then the state of insulation for being tested generator stator bar insulation is poorer.
2. the generator stator bar state of insulation assessment method according to claim 1 based on low-voltage and multi-parameter,
It is characterized in that：In the step (2), maximum charging voltage U is preset according to subject rated voltagecmax, quilt
It is higher to try rated voltage, then maximum charging voltage UcmaxIt is higher, maximum charging voltage UcmaxValue is in 2000V~3000V
In the range of；Charging interval tc set in advance be followed successively by 20ms, 50ms, 100ms, 200ms, 500ms, 1s, 2s, 5s, 10s,
20s, 50s, 100s, 200s, 500s, 1000s, discharge time td are charging interval tc half.
3. the generator stator bar state of insulation test and appraisal side according to claim 1 or 2 based on low-voltage and multi-parameter
Method, it is characterised in that：The magnitude of voltage of the DC experiment power supply Ud is in the range of 2000V~3000V.
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| CN109283445B (en) * | 2018-10-24 | 2021-05-11 | 中车株洲电力机车有限公司 | Insulation detection method and controller of energy storage type rail vehicle charging system |
| CN111880049B (en) * | 2020-05-27 | 2021-09-10 | 西安交通大学 | Oil paper sleeve damp positioning method based on polarity inversion frequency domain dielectric response |
| CN111880050B (en) * | 2020-05-27 | 2021-09-10 | 西安交通大学 | Oil paper sleeve damp positioning method based on polarity reversal time domain dielectric response |
| CN115753913B (en) * | 2022-11-18 | 2024-01-23 | 南方电网调峰调频发电有限公司检修试验分公司 | Method, device, equipment and medium for determining wet degradation of motor stator bar |
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Effective date of registration: 20200417 Address after: 510080 Dongfeng East Road, Dongfeng, Guangdong, Guangzhou, Zhejiang Province, No. 8 Patentee after: Electric Power Research Institute of Guangdong Power Grid Co.,Ltd. Address before: 510080, No. 8, Qi Gang, Dongfeng East Road, Guangzhou, Guangdong Co-patentee before: GUANGZHOU YUENENG POWER TECHNOLOGY DEVELOPMENT Co.,Ltd. Patentee before: Electric Power Research Institute of Guangdong Power Grid Co.,Ltd. |