CN105182201A - Generator stator bar insulation state evaluation method based on low voltage and multiple parameters - Google Patents
Generator stator bar insulation state evaluation method based on low voltage and multiple parameters Download PDFInfo
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- CN105182201A CN105182201A CN201510631719.XA CN201510631719A CN105182201A CN 105182201 A CN105182201 A CN 105182201A CN 201510631719 A CN201510631719 A CN 201510631719A CN 105182201 A CN105182201 A CN 105182201A
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Abstract
The invention discloses a generator stator bar insulation state evaluation method based on low voltage and multiple parameters. A tested generator stator bar insulation medium is connected with a DC test power supply; the DC test power supply is serially connected with the tested generator stator bar insulation medium via a charging switch; and a discharging switch is parallelly connected with the tested generator stator bar insulation medium. Before the test, both the charging switch and the discharging switch are in off states, the tested generator stator bar insulation medium performs complete discharging, and the maximum charging voltage, charging time and discharging time are preset; during the test, the tested generator stator bar insulation medium is firstly charged and then discharged, and the highest voltage value appearing during the process is recorded as a voltage peak value of the charging and discharging test; and according to the voltage peak value of each charging and discharging test and the charging time, the generator stator bar insulation state is evaluated. The evaluation method adopts low voltage measurement, the operation is simple, and generator stator bar insulation is not destructive.
Description
Technical field
The present invention relates to high voltage electric equipment Condition assessment of insulation field, specifically refer to the generator stator bar state of insulation assessment method based on low-voltage and multiparameter.
Background technology
Along with China's rapid development of economy, power industry is also developed fast, and installation total amount and generated energy increase further, and electrical network scale expands gradually.The state of insulation of high-rating generator is correctly assessed, works out scientific and reasonable operation, turnaround plan, be conducive to safeguarding generator operation safety, improve generating efficiency, promote the safe reliability of operation of power networks.
The insulation degree of insulating material determines the safe operation of high-rating generator and the key factor in serviceable life.At present, the traditional experiment for generator stator bar insulation mainly comprises insulation measurement, dielectric loss measurement, ac voltage withstanding, DC break down voltage etc.They are for reducing generator accident, ensureing that safe operation of power system has played positive effect.
But, above-mentioned various method all also exists shortcoming and defect: A partial experiment needs to apply high voltage, there is hidden danger generator stator bar insulation being caused to damage in high-potting, the company that therefore Siemens etc. are external does not advise that the generator put into operation to scene carries out this class high-potting; Test findings information is single, assessing in a certain respect only to generator stator bar state of insulation, such as, shelf depreciation only can find dissociation in insulant air-gap and local defect, but can not discovering device insulation general defect, medium loss test mainly reflects apparatus insulated general defect, and insensitive to local defect reflection.
Therefore, when adopting classic method, if will assess the generator stator bar integrality that insulate, then need to carry out multiple different high-potting, this itself has certain destructiveness to generator stator bar insulation, and test process also exists certain security risk.
Summary of the invention
The object of this invention is to provide the generator stator bar state of insulation assessment method based on low-voltage and multiparameter, this assessment method is simple to operate, only need apply lower voltage to generator stator bar insulation, just can accurately test generator stator bar state of insulation and assess, not there is destructiveness to generator stator bar insulation.
Above-mentioned purpose of the present invention realizes by following technical solution: based on the generator stator bar state of insulation assessment method of low-voltage and multiparameter, it is characterized in that, this assessment method comprises the steps:
(1) tested generator stator bar insulating medium Cx is connected with DC experiment power supply Ud, DC experiment power supply Ud is connected by charge switch K1 and tested generator stator bar insulating medium Cx, and discharge switch K2 and tested generator stator bar insulating medium Cx is in parallel;
(2) before testing, charge switch K1 and discharge switch K2 is all in off-state, and tested generator stator bar insulating medium Cx thoroughly discharges, and presets maximum charging voltage U
cmaxwith duration of charging tc and discharge time td;
(3), when test starts, close charge switch K1, to tested generator stator bar insulating medium Cx with pre-set maximum charging voltage U
cmaxcharge;
(4) after duration of charging tc charges, charge switch K1 is opened, discharge switch K2 is closed simultaneously, tested generator stator bar insulating medium Cx is discharged;
(5) again after td electric discharge discharge time, discharge switch K2 is opened, adopt the voltage of voltage-measuring equipment to tested generator stator bar insulating medium Cx two ends to carry out whole process to measure simultaneously, until the voltage at tested generator stator bar insulating medium Cx two ends reduces to 0V, in the process, the voltage at tested generator stator bar insulating medium Cx two ends can exist one and first raise the process reduced afterwards, records in this process and occurs that maximum voltage value is the voltage peak U of discharge and recharge test
rmax;
(6) at least ten discharge and recharge tests and voltage measurement are carried out to tested generator stator bar insulating medium Cx, record the voltage peak U of each discharge and recharge test
rmaxwith duration of charging tc, according to record Plotting data repeatedly discharge and recharge test voltage peak U
rmaxwith the graph of relation of duration of charging tc;
(7) the voltage peak U that the discharge and recharge obtained according to step (6) is tested
rmaxwith the graph of relation of duration of charging tc, generator stator bar state of insulation is tested and assessed.
Assessment method of the present invention, before test starts, according to the situation of generator, determines suitable DC charging voltage, duration of charging and discharge time; When test starts, first closed by charge switch, DC voltage is charged to generator stator bar insulating medium; After charging after a while, charge switch is disconnected, discharge switch is closed simultaneously, generator stator bar insulating medium is discharged; After the electric discharge of set time, discharge switch is opened, adopt the voltage of voltage-measuring equipment to tested generator stator bar insulating medium two ends to measure, until the voltage at tested generator stator bar insulating medium two ends reduces to zero simultaneously.
The voltage at tested generator stator bar insulating medium two ends has one and first raises the process reduced again, therefore there will be a voltage peak.By the Insulation test of repeatedly different discharge and recharge ageing, obtain the relation curve between voltage peak and duration of charging, this curve can reflect the polarization characteristic of generator stator bar insulating medium.By just assessment can be made to generator stator bar state of insulation to the analysis of this curve.
Only need apply lower voltage to generator stator bar insulation in test of the present invention, not there is destructiveness to generator stator bar insulation, can supplement preferably the classic method of Condition assessment of insulation.
Low-voltage in the present invention refers to the voltage of voltage lower than 3000V.
In the present invention, in described step (2), preset maximum charging voltage U according to tested rated voltage
cmax, tested rated voltage is higher, then maximum charging voltage U
cmaxhigher, maximum charging voltage U
cmaxvalue is within the scope of 2000V ~ 3000V; The duration of charging tc preset is followed successively by 20ms, 50ms, 100ms, 200ms, 500ms, 1s, 2s, 5s, 10s, 20s, 50s, 100s, 200s, 500s, 1000s, and discharge time, td was the half of duration of charging tc.
In the present invention, described step (7) to the concrete steps that generator stator bar state of insulation is tested and assessed is:
If the voltage peak U of discharge and recharge test
rmaxin rising trend with the graph of relation of duration of charging tc, not there is peak value, then judge that this generator stator bar state of insulation is good;
If the voltage peak U of discharge and recharge test
rmaxdeclining again in first rising with the graph of relation of duration of charging tc, occurring a peak value, but the time that peak value occurs is after 1s, then judge that this generator stator bar state of insulation is good;
If the voltage peak U of discharge and recharge test
rmaxoccur at least two peak values with the graph of relation of duration of charging tc, then judge that the insulation of this generator stator bar exists local and makes moist or the phenomenon of insulation ag(e)ing, it is more that peak value occurs, then the state of insulation of tested generator stator bar insulator is poorer;
If the voltage peak U of discharge and recharge test
rmaxdeclining again in first rising with the graph of relation of duration of charging tc, occurring a peak value, occurring that the time of peak value is before 1s, then can judge that the insulation of this generator stator bar exists and locally make moist or the phenomenon of insulation ag(e)ing; More early, then the state of insulation of tested generator stator bar insulation is poorer for peak value time of occurrence.
In the present invention, the magnitude of voltage of described DC experiment power supply Ud, within the scope of 2000V ~ 3000V, meets the testing requirements of existing motor substantially.
Generator stator bar state of insulation assessment method based on low-voltage and multiparameter of the present invention, by setting maximum charging voltage and discharge and recharge time, apply to generator stator bar the trial voltage being applicable to its insulating medium feature and insulation system, the voltage at generator stator bar insulating medium two ends is measured.Carry out many group discharge and recharge tests, the polarization curve of formation voltage and time relationship, for generator stator bar Condition assessment of insulation.
This assessment method only need apply nondestructive voltage to generator stator bar insulation, can test the multiple parameters obtaining generator stator bar insulation, thus effectively assess generator stator bar state of insulation.The insulation status of generator is diagnosed, grasps the running status of generator, to the scientific and rational generator operation of formulation, maintenance and renewal plan, to raising efficiency of generator and operation of power networks reliability, be all significant.
Compared with prior art, the generator stator bar state of insulation assessment method based on low-voltage and multiparameter of the present invention, only need apply lower voltage to generator stator bar insulation, not have destructiveness to generator stator bar insulation.Test obtains the polarization curve of generator stator bar insulation, to make moist or overall ageing state is effectively assessed to the local of generator stator bar insulation.Condition assessment of insulation method provided by the invention better can be supplemented such as traditional method such as insulation resistance, shelf depreciation, dielectric loss.
Accompanying drawing explanation
Below in conjunction with the drawings and specific embodiments, the present invention is described in further detail:
Fig. 1 is the theory diagram of assessment method of the present invention;
Fig. 2 is the voltage waveform view of assessment method of the present invention when carrying out generator stator bar Insulation test;
Fig. 3 is the voltage peak U of discharge and recharge test in assessment method embodiment one of the present invention
rmaxwith the graph of relation of duration of charging tc;
Fig. 4 is the voltage peak U of discharge and recharge test in assessment method embodiment two of the present invention
rmaxwith the graph of relation of duration of charging tc;
Fig. 5 is the voltage peak U of discharge and recharge test in assessment method embodiment three of the present invention
rmaxwith the graph of relation of duration of charging tc;
Fig. 6 is the voltage peak U of discharge and recharge test in assessment method embodiment four of the present invention
rmaxwith the graph of relation of duration of charging tc.
In the application, the physical meaning of each parameter is:
Ud-DC experiment power supply; Cx-tested generator stator bar insulating medium;
K1-charge switch; K2-discharge switch;
U
cmax-maximum charging voltage; U
rmaxthe voltage peak of-discharge and recharge test;
Tc-duration of charging; Td-discharge time;
T
r-release time;
Insulating medium two ends apply DC voltage, will produce polarization phenomena.Remove short circuit insulation two ends, then insulating surface generation depolarization phenomenon after voltage.After removing the shorting stub of two interpolars, process of depolarization is still in continuation, and the bound charge by polarization constraint becomes free charge, and produces a voltage at insulation two ends, first raises and is reduced to zero again.Release time t
rand duration of charging tc and discharge time td " between have certain relation, but be difficult to quantize.If tc is constant, td increases, then t
rreduce, if td is far longer than tc, then t
rlevel off to 0; Therefore in the present invention, regulation tc is greater than td, General Requirements td=tc/2; When the present invention specifies, generally speaking, tc is larger, t
rlarger.
Embodiment
Embodiment one
As shown in Figure 1, the present invention is based on the generator stator bar state of insulation assessment method of low-voltage and multiparameter, this assessment method comprises the steps:
(1) tested generator stator bar insulating medium Cx is connected with DC experiment power supply Ud, the magnitude of voltage of DC experiment power supply Ud is 3000V, DC experiment power supply Ud is connected by charge switch K1 and tested generator stator bar insulating medium Cx, and discharge switch K2 and tested generator stator bar insulating medium Cx is in parallel;
(2) before testing, charge switch K1 and discharge switch K2 is all in off-state, and tested generator stator bar insulating medium Cx thoroughly discharges, and pre-determines maximum charging voltage U
cmaxwith duration of charging tc and discharge time td, wherein, maximum charging voltage U
cmaxfor 3000V, the duration of charging, tc was followed successively by 20ms, 50ms, 100ms, 200ms, 500ms, 1s, 2s, 5s, 10s, 20s, 50s, 100s, 200s, 500s, 1000s, and discharge time, td was the half of duration of charging tc, td=tc/2;
(3), when test starts, close charge switch K1, to tested generator stator bar insulating medium Cx with pre-set maximum charging voltage U
cmaxcharge;
(4) after duration of charging tc charges, charge switch K1 is opened, discharge switch K2 is closed simultaneously, tested generator stator bar insulating medium Cx is discharged;
(5) again after td electric discharge discharge time, discharge switch K2 is opened, adopt the voltage of voltage-measuring equipment to tested generator stator bar insulating medium Cx two ends to carry out whole process to measure simultaneously, until the voltage at tested generator stator bar insulating medium Cx two ends reduces to 0V, in the process, the voltage at tested generator stator bar insulating medium Cx two ends can exist one and first raise the process reduced afterwards, records in this process and occurs that maximum voltage value is the voltage peak U of discharge and recharge test
rmax;
(6) 15 discharge and recharge tests and voltage measurement are carried out to tested generator stator bar insulating medium Cx, record the voltage peak U of each discharge and recharge test
rmaxwith duration of charging tc, record data as shown in table 1, according to the record Plotting data shown in table 1 repeatedly discharge and recharge test voltage peak U
rmaxwith the graph of relation of duration of charging tc, this graph of relation as shown in Figure 3;
Table 1: the voltage peak U of discharge and recharge test in embodiment one
rmaxwith duration of charging tc tables of data
| U Rmax(V) | tc | U Rmax(V) | tc | U Rmax(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 that the discharge and recharge obtained according to step (6) is tested
rmaxwith the graph of relation of duration of charging tc, generator stator bar state of insulation is tested and assessed.
As seen from Figure 3, the voltage peak U of discharge and recharge test
rmaxin rising trend with the graph of relation of duration of charging tc, not there is peak value, then judge that this generator stator bar state of insulation is good.
As the conversion of the present embodiment, the magnitude of voltage of DC experiment power supply Ud also according to different motor value within the scope of 2000V ~ 3000V, such as can get 2200V or 2500V or 2600V or 2800V etc.
As the conversion of the present embodiment, maximum charging voltage U
cmaxvalue can within the scope of 2000V ~ 3000V value, such as get 2200V or 2500V or 2600V or 2800V etc.; Maximum charging voltage U is preset according to tested rated voltage
cmax, tested rated voltage is higher, then maximum charging voltage U
cmaxhigher, maximum charging voltage U
cmaxvalue is within the scope of 2000V ~ 3000V; The duration of charging tc preset is followed successively by 20ms, 50ms, 100ms, 200ms, 500ms, 1s, 2s, 5s, 10s, 20s, 50s, 100s, 200s, 500s, 1000s, and discharge time, td was the half of duration of charging tc.
Embodiment two
As shown in Figure 1, the present invention is based on the generator stator bar state of insulation assessment method of low-voltage and multiparameter, this assessment method comprises the steps:
(1) tested generator stator bar insulating medium Cx is connected with DC experiment power supply Ud, the magnitude of voltage of DC experiment power supply Ud is 3000V, DC experiment power supply Ud is connected by charge switch K1 and tested generator stator bar insulating medium Cx, and discharge switch K2 and tested generator stator bar insulating medium Cx is in parallel; (illustrate:.)
(2) before testing, charge switch K1 and discharge switch K2 is all in off-state, and tested generator stator bar insulating medium Cx thoroughly discharges, and pre-determines maximum charging voltage U
cmaxwith duration of charging tc and discharge time td wherein, maximum charging voltage U
cmaxfor 3000V, the duration of charging, tc was followed successively by 20ms, 50ms, 100ms, 200ms, 500ms, 1s, 2s, 5s, 10s, 20s, 50s, 100s, 200s, 500s, 1000s, and discharge time, td was the half of duration of charging tc, td=tc/2;
(3), when test starts, close charge switch K1, to tested generator stator bar insulating medium Cx with pre-set maximum charging voltage U
cmaxcharge;
(4) after duration of charging tc charges, charge switch K1 is opened, discharge switch K2 is closed simultaneously, tested generator stator bar insulating medium Cx is discharged;
(5) again after td electric discharge discharge time, discharge switch K2 is opened, adopt the voltage of voltage-measuring equipment to tested generator stator bar insulating medium Cx two ends to carry out whole process to measure simultaneously, until the voltage at tested generator stator bar insulating medium Cx two ends reduces to 0V, in the process, the voltage at tested generator stator bar insulating medium Cx two ends can exist one and first raise the process reduced afterwards, records in this process and occurs that maximum voltage value is the voltage peak U of discharge and recharge test
rmax;
(6) 15 discharge and recharge tests and voltage measurement are carried out to tested generator stator bar insulating medium Cx, record the voltage peak U of each discharge and recharge test
rmaxwith duration of charging tc, record data as shown in table 2, according to the record Plotting data shown in table 2 repeatedly discharge and recharge test voltage peak U
rmaxwith the graph of relation of duration of charging tc, this graph of relation as shown in Figure 4;
Table 2: the voltage peak U of discharge and recharge test in embodiment two
rmaxwith duration of charging tc tables of data
| tc | U Rmax(V) | tc | U Rmax(V) | tc | U Rmax(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) graph of relation of the voltage peak URmax that the discharge and recharge obtained according to step (6) is tested and duration of charging tc, tests and assesses to generator stator bar state of insulation.
As seen from Figure 4, the voltage peak U of discharge and recharge test
rmaxdeclining in first rising with the graph of relation of duration of charging tc again, occurring a peak value, but the time that peak value occurs is when 100s, the time of appearance is more late, then judge that this generator stator bar state of insulation is good.
It should be noted that, if the voltage peak U of discharge and recharge test simultaneously
rmaxdeclining again in first rising with the graph of relation of duration of charging tc, occurring a peak value, but the time that peak value occurs is after 1s, then judge that this generator stator bar state of insulation is good.
As the conversion of the present embodiment, the magnitude of voltage of DC experiment power supply Ud also according to different motor value within the scope of 2000V ~ 3000V, such as can get 2200V or 2500V or 2600V or 2800V etc.
As the conversion of the present embodiment, maximum charging voltage U
cmaxvalue can within the scope of 2000V ~ 3000V value, such as get 2200V or 2500V or 2600V or 2800V etc.; Maximum charging voltage U is preset according to tested rated voltage
cmax, tested rated voltage is higher, then maximum charging voltage U
cmaxhigher, maximum charging voltage U
cmaxvalue is within the scope of 2000V ~ 3000V; The duration of charging tc preset is followed successively by 20ms, 50ms, 100ms, 200ms, 500ms, 1s, 2s, 5s, 10s, 20s, 50s, 100s, 200s, 500s, 1000s, and discharge time, td was the half of duration of charging tc.
Embodiment three
As shown in Figure 1, the present invention is based on the generator stator bar state of insulation assessment method of low-voltage and multiparameter, this assessment method comprises the steps:
(1) tested generator stator bar insulating medium Cx is connected with DC experiment power supply Ud, the magnitude of voltage of DC experiment power supply Ud is 3000V, DC experiment power supply Ud is connected by charge switch K1 and tested generator stator bar insulating medium Cx, and discharge switch K2 and tested generator stator bar insulating medium Cx is in parallel;
(2) before testing, charge switch K1 and discharge switch K2 is all in off-state, and tested generator stator bar insulating medium Cx thoroughly discharges, and pre-determines maximum charging voltage U
cmaxwith duration of charging tc and discharge time td wherein, maximum charging voltage U
cmaxfor 3000V, the duration of charging, tc was followed successively by 20ms, 50ms, 100ms, 200ms, 500ms, 1s, 2s, 5s, 10s, 20s, 50s, 100s, 200s, 500s, 1000s, and discharge time, td was the half of duration of charging tc, td=tc/2;
(3), when test starts, close charge switch K1, to tested generator stator bar insulating medium Cx with pre-set maximum charging voltage U
cmaxcharge;
(4) after duration of charging tc charges, charge switch K1 is opened, discharge switch K2 is closed simultaneously, tested generator stator bar insulating medium Cx is discharged;
(5) again after td electric discharge discharge time, discharge switch K2 is opened, adopt the voltage of voltage-measuring equipment to tested generator stator bar insulating medium Cx two ends to carry out whole process to measure simultaneously, until the voltage at tested generator stator bar insulating medium Cx two ends reduces to 0V, in the process, the voltage at tested generator stator bar insulating medium Cx two ends can exist one and first raise the process reduced afterwards, records in this process and occurs that maximum voltage value is the voltage peak U of discharge and recharge test
rmax;
(6) 15 discharge and recharge tests and voltage measurement are carried out to tested generator stator bar insulating medium Cx, record the voltage peak U of each discharge and recharge test
rmaxwith duration of charging tc, according to record Plotting data repeatedly discharge and recharge test voltage peak U
rmaxwith the graph of relation of duration of charging tc, this graph of relation as shown in Figure 5;
(7) the voltage peak U that the discharge and recharge obtained according to step (6) is tested
rmaxwith the graph of relation of duration of charging tc, generator stator bar state of insulation is tested and assessed.
As seen from Figure 5, the voltage peak U of discharge and recharge test
rmaxoccur two peak values with the graph of relation of duration of charging tc, then judge that the insulation of this generator stator bar exists local and makes moist or the phenomenon of insulation ag(e)ing, it is more that peak value occurs, then the state of insulation of tested generator stator bar insulator is poorer.
It should be noted that, if the voltage peak U of discharge and recharge test simultaneously
rmaxoccur at least two peak values with the graph of relation of duration of charging tc, then judge that the insulation of this generator stator bar exists local and makes moist or the phenomenon of insulation ag(e)ing, it is more that peak value occurs, then the state of insulation of tested generator stator bar insulator is poorer.
As the conversion of the present embodiment, the magnitude of voltage of DC experiment power supply Ud also according to different motor value within the scope of 2000V ~ 3000V, such as can get 2200V or 2500V or 2600V or 2800V etc.
As the conversion of the present embodiment, maximum charging voltage U
cmaxvalue can within the scope of 2000V ~ 3000V value, such as get 2200V or 2500V or 2600V or 2800V etc.; Maximum charging voltage U is preset according to tested rated voltage
cmax, tested rated voltage is higher, then maximum charging voltage U
cmaxhigher, maximum charging voltage U
cmaxvalue is within the scope of 2000V ~ 3000V; The duration of charging tc preset is followed successively by 20ms, 50ms, 100ms, 200ms, 500ms, 1s, 2s, 5s, 10s, 20s, 50s, 100s, 200s, 500s, 1000s, and discharge time, td was the half of duration of charging tc.
Embodiment four
As shown in Figure 1, the present invention is based on the generator stator bar state of insulation assessment method of low-voltage and multiparameter, this assessment method comprises the steps:
(1) tested generator stator bar insulating medium Cx is connected with DC experiment power supply Ud, the magnitude of voltage of DC experiment power supply Ud is 3000V, DC experiment power supply Ud is connected by charge switch K1 and tested generator stator bar insulating medium Cx, and discharge switch K2 and tested generator stator bar insulating medium Cx is in parallel;
(2) before testing, charge switch K1 and discharge switch K2 is all in off-state, and tested generator stator bar insulating medium Cx thoroughly discharges, and pre-determines maximum charging voltage U
cmaxwith duration of charging tc and discharge time td wherein, maximum charging voltage U
cmaxfor 3000V, the duration of charging, tc was followed successively by 20ms, 50ms, 100ms, 200ms, 500ms, 1s, 2s, 5s, 10s, 20s, 50s, 100s, 200s, 500s, 1000s, and discharge time, td was the half of duration of charging tc, td=tc/2;
(3), when test starts, close charge switch K1, to tested generator stator bar insulating medium Cx with pre-set maximum charging voltage U
cmaxcharge;
(4) after duration of charging tc charges, charge switch K1 is opened, discharge switch K2 is closed simultaneously, tested generator stator bar insulating medium Cx is discharged;
(5) again after td electric discharge discharge time, discharge switch K2 is opened, adopt the voltage of voltage-measuring equipment to tested generator stator bar insulating medium Cx two ends to carry out whole process to measure simultaneously, until the voltage at tested generator stator bar insulating medium Cx two ends reduces to 0V, in the process, the voltage at tested generator stator bar insulating medium Cx two ends can exist one and first raise the process reduced afterwards, records in this process and occurs that maximum voltage value is the voltage peak U of discharge and recharge test
rmax;
(6) 15 discharge and recharge tests and voltage measurement are carried out to tested generator stator bar insulating medium Cx, record the voltage peak U of each discharge and recharge test
rmaxwith duration of charging tc, according to record Plotting data repeatedly discharge and recharge test voltage peak U
rmaxwith the graph of relation of duration of charging tc, this graph of relation as shown in Figure 6;
(7) the voltage peak U that the discharge and recharge obtained according to step (6) is tested
rmaxwith the graph of relation of duration of charging tc, generator stator bar state of insulation is tested and assessed.
As seen from Figure 6, the voltage peak U of discharge and recharge test
rmaxdeclining again in first rising with the graph of relation of duration of charging tc, occurring a peak value, occurring that the time of peak value is before 1s, peak value occur comparatively early, then can judge that the insulation of this generator stator bar exists and locally make moist or the phenomenon of insulation ag(e)ing.Peak value time of occurrence more early, then illustrates that the state of insulation that tested generator stator bar insulate is poorer simultaneously.
As the conversion of the present embodiment, the magnitude of voltage of DC experiment power supply Ud also according to different motor value within the scope of 2000V ~ 3000V, such as can get 2200V or 2500V or 2600V or 2800V etc.
As the conversion of the present embodiment, maximum charging voltage U
cmaxvalue can within the scope of 2000V ~ 3000V value, such as get 2200V or 2500V or 2600V or 2800V etc.; Maximum charging voltage U is preset according to tested rated voltage
cmax, tested rated voltage is higher, then maximum charging voltage U
cmaxhigher, maximum charging voltage U
cmaxvalue is within the scope of 2000V ~ 3000V; The duration of charging tc preset is followed successively by 20ms, 50ms, 100ms, 200ms, 500ms, 1s, 2s, 5s, 10s, 20s, 50s, 100s, 200s, 500s, 1000s, and discharge time, td was the half of duration of charging tc.
The present invention is not limited to above-mentioned embodiment; according to foregoing; according to ordinary technical knowledge and the customary means of this area; do not departing under the present invention's above-mentioned basic fundamental thought prerequisite; the present invention can also make the equivalent modifications of other various ways, replacement or change, all drops among protection scope of the present invention.
Claims (7)
1., based on the generator stator bar state of insulation assessment method of low-voltage and multiparameter, it is characterized in that, this assessment method comprises the steps:
(1) tested generator stator bar insulating medium Cx is connected with DC experiment power supply Ud, DC experiment power supply Ud is connected by charge switch K1 and tested generator stator bar insulating medium Cx, and discharge switch K2 and tested generator stator bar insulating medium Cx is in parallel;
(2) before testing, charge switch K1 and discharge switch K2 is all in off-state, and tested generator stator bar insulating medium Cx thoroughly discharges, and presets maximum charging voltage U
cmaxwith duration of charging tc and discharge time td;
(3), when test starts, close charge switch K1, to tested generator stator bar insulating medium Cx with pre-set maximum charging voltage U
cmaxcharge;
(4) after duration of charging tc charges, charge switch K1 is opened, discharge switch K2 is closed simultaneously, tested generator stator bar insulating medium Cx is discharged;
(5) again after td electric discharge discharge time, discharge switch K2 is opened, adopt the voltage of voltage-measuring equipment to tested generator stator bar insulating medium Cx two ends to carry out whole process to measure simultaneously, until the voltage at tested generator stator bar insulating medium Cx two ends reduces to 0V, in the process, the voltage at tested generator stator bar insulating medium Cx two ends can exist one and first raise the process reduced afterwards, records in this process and occurs that maximum voltage value is the voltage peak U of discharge and recharge test
rmax;
(6) at least ten discharge and recharge tests and voltage measurement are carried out to tested generator stator bar insulating medium Cx, record the voltage peak U of each discharge and recharge test
rmaxwith duration of charging tc, according to record Plotting data repeatedly discharge and recharge test voltage peak U
rmaxwith the graph of relation of duration of charging tc;
(7) the voltage peak U that the discharge and recharge obtained according to step (6) is tested
rmaxwith the graph of relation of duration of charging tc, generator stator bar state of insulation is tested and assessed.
2. the generator stator bar state of insulation assessment method based on low-voltage and multiparameter according to claim 1, is characterized in that: in described step (2), preset maximum charging voltage U according to tested rated voltage
cmax, tested rated voltage is higher, then maximum charging voltage U
cmaxhigher, maximum charging voltage U
cmaxvalue is within the scope of 2000V ~ 3000V; The duration of charging tc preset is followed successively by 20ms, 50ms, 100ms, 200ms, 500ms, 1s, 2s, 5s, 10s, 20s, 50s, 100s, 200s, 500s, 1000s, and discharge time, td was the half of duration of charging tc.
3. the generator stator bar state of insulation assessment method based on low-voltage and multiparameter according to claim 1, is characterized in that: described step (7) to the concrete steps that generator stator bar state of insulation is tested and assessed is: if the voltage peak U of discharge and recharge test
rmaxin rising trend with the graph of relation of duration of charging tc, not there is peak value, then judge that this generator stator bar state of insulation is good.
4. the generator stator bar state of insulation assessment method based on low-voltage and multiparameter according to claim 1, is characterized in that: described step (7) to the concrete steps that generator stator bar state of insulation is tested and assessed is: if the voltage peak U of discharge and recharge test
rmaxdeclining again in first rising with the graph of relation of duration of charging tc, occurring a peak value, but the time that peak value occurs is after 1s, then judge that this generator stator bar state of insulation is good.
5. the generator stator bar state of insulation assessment method based on low-voltage and multiparameter according to claim 1, is characterized in that: described step (7) to the concrete steps that generator stator bar state of insulation is tested and assessed is: if the voltage peak U of discharge and recharge test
rmaxoccur at least two peak values with the graph of relation of duration of charging tc, then judge that the insulation of this generator stator bar exists local and makes moist or the phenomenon of insulation ag(e)ing, it is more that peak value occurs, then the state of insulation of tested generator stator bar insulator is poorer.
6. the generator stator bar state of insulation assessment method based on low-voltage and multiparameter according to claim 1, is characterized in that: described step (7) to the concrete steps that generator stator bar state of insulation is tested and assessed is: if the voltage peak U of discharge and recharge test
rmaxdeclining again in first rising with the graph of relation of duration of charging tc, occurring a peak value, occurring that the time of peak value is before 1s, then can judge that the insulation of this generator stator bar exists and locally make moist or the phenomenon of insulation ag(e)ing; More early, then the state of insulation of tested generator stator bar insulation is poorer for peak value time of occurrence.
7. the generator stator bar state of insulation assessment method based on low-voltage and multiparameter according to any one of claim 1 to 6, is characterized in that: the magnitude of voltage of described DC experiment power supply Ud is within the scope of 2000V ~ 3000V.
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| CN111880050A (en) * | 2020-05-27 | 2020-11-03 | 西安交通大学 | Oil paper sleeve damp positioning method based on polarity reversal time domain dielectric response |
| CN111880049A (en) * | 2020-05-27 | 2020-11-03 | 西安交通大学 | Oil paper sleeve damp positioning method based on polarity inversion frequency domain dielectric response |
| CN115753913A (en) * | 2022-11-18 | 2023-03-07 | 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 moisture 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. |