CN103454536A - Power transformer test method - Google Patents
Power transformer test method Download PDFInfo
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- CN103454536A CN103454536A CN2013104209416A CN201310420941A CN103454536A CN 103454536 A CN103454536 A CN 103454536A CN 2013104209416 A CN2013104209416 A CN 2013104209416A CN 201310420941 A CN201310420941 A CN 201310420941A CN 103454536 A CN103454536 A CN 103454536A
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Abstract
The invention discloses a power transformer test method. According to the power transformer test method, a set of data are obtained through measurement and used as 'original data' on the condition that a transformer is not connected with wires on any side before the transformer is put into operation; after the transformer is connected with the wires on all sides, another set of data are obtained through measurement and used as 'essential data'; every time the transformer is tested, obtained test data are contrasted with the 'essential data' under the condition that the wires through which the transformer is connected with other devices are not dismounted. According to the novel power transformer test method, analysis is conducted on the test data, and the fact that the transformer operates normally is determined if the test data are normal; when the test data are abnormal, the test data are contrasted with the 'original data' for further analysis and judgment. According to the power transformer test method, the wires on all the sides of the transformer do not need dismounting whether a regular test or preventive test is conducted on the transformer, therefore, the time of a power failure is shortened, a lot of manpower, material resources and financial resources are saved, and safety is ensured at the same time.
Description
Technical field
The present invention relates to a kind of test method during to power transformer regular inspection or preventive trial.
Background technology
At present, in electric system, when no matter transformer is regular inspection or preventive trial, common way is that the lead-in wire that each side of transformer (two circles or three circles) is connected with bus or primary equipment is removed, and then transformer itself is tested routinely.There is following several shortcoming in this classic method that lead-in wire is dismantled to transformer test again: 1, during the demolition, installation lead-in wire, the staff needs ascend operation, particularly 220kV, 500kV and above transformer, the liftoff plane of cannula tip has tens meters even twenties meters, when the people ascends a height the demolition, installation lead-in wire, just exist the danger that the staff falls from high altitude; 2, demolition, installation lead-in wire, to expend a large amount of material resources: need purchase expensive high-altitude operation vehicle, bucket arm vehicle and other guarantees safe Work tool, take a lot of work again, time-consuming simultaneously, according to experience in the past, the time that only the demolition, installation lead-in wire exhausts, just account for 1/3 of whole power off time; When 3, demolition, installation go between, easily cause the device clamp fracture, damage; 4, when lead-in wire dress, as deal with improperly, easily cause the device clamp of lead-in wire overheated with the conducting rod loose contact generation of sleeve pipe.
inventive method
The technical problem to be solved in the present invention is to provide a kind of test method during to power transformer regular inspection or preventive trial, this method can be in the situation that without disconnecting power lead, to power transformer regular inspection or preventive trial, and can effectively overcome the problem that prior art exists.
Solving the technical scheme that problem of the present invention takes is:
Before putting into operation, transformer measures one group of data as " raw data " in the situation that do not connect each side lead-in wire, measure again one group of data as " basic data " after connecting each side lead-in wire, when this transformer is done experiment, in the situation that do not remove the lead-in wire that transformer is connected with miscellaneous equipment, the test figure and " basic data " that draw are compared;
At first oneself is had a power failure and carries out the power transformer of safety practice, remove successively the ground wire of each side, test lead when projects are tested directly is connected on the sleeve pipe top successively, has recorded environment temperature, humidity and transformer body temperature simultaneously, and concrete test method step is:
1) transformer core and clamp insulation are measured: by each side short circuit grounding of transformer;
2) insulation resistance of each winding and sleeve of transformer: by the G of megohmmeter end ground connection, respectively by the winding to be tested of the L of megohmmeter end and transformer, iron core and folder connect, be in series with unilateral diode D between the winding to be tested of L end and transformer, the L end is by the rear ground connection of capacitor C 1, the positive pole of described unilateral diode D is connected with the L end, the E of megohmmeter end is connected with the winding non-to be tested of transformer, described winding to be tested is respectively the high pressure winding, the low pressure winding, without winding, obtain respectively high pressure winding and the iron core insulation resistance R1 to the low pressure winding, low pressure winding and the iron core insulation resistance R2 to the high pressure winding, the insulation resistance R3 of iron core to senior middle school's low pressure winding, this test result is as the insulating resistance value in " measurement data ",
3) analyze the insulating resistance value R of winding: the insulating resistance value in " measurement data " is compared with resistance value corresponding in " raw data ", when the insulating resistance value in " measurement data " is more than or equal to 1.3 times of insulating resistance value corresponding to " raw data ", between each winding, insulation is good, the one group of insulating resistance value that has at least in " measurement data " is less than 1.3 times of insulating resistance value corresponding to " raw data ", but while being greater than " raw data " corresponding insulating resistance value, by the middle insulating resistance value of itself and " basic data " relatively, when the insulating resistance value in " measurement data " is more than or equal to 0.7 times of insulating resistance value corresponding in " basic data ", between each winding, insulation is good, when in " measurement data " one group or two groups of insulating resistance values are less than 0.7 times of insulating resistance value corresponding in " basic data ", carry out the transformer oil test, the hidden danger existed to get rid of transformer, insulation resistance numerical value in " measurement data " all is less than 0.7 times of insulating resistance value corresponding in " basic data ", or the insulating resistance value in " measurement data " is while being less than or equal to insulating resistance value corresponding in " raw data ", transformer is returned to the repair in shop reason,
4) sleeve pipe is together with the leakage current measurement of winding: while surveying high-pressure side, the high-voltage connection of high voltage direct current generator connects step-up side, non-tested winding connects the shielding end of high voltage direct current generator high-voltage connection, in like manner the like measure the leakage current values of other winding;
The winding leakage current recorded is compared with the winding leakage current in " raw data ", when the two the absolute value of measures of dispersion be less than or equal to " raw data " corresponding leakage current 5% the time, leakage current is in safe range, when the two the absolute value of measures of dispersion be greater than " raw data " corresponding leakage current 5% the time, carry out malfunction elimination.
5) sleeve pipe is together with dielectric loss and the measured capacitance value of coil: for the transformer of voltage levels as 110kV and more than, when carrying out sleeve pipe together with the dielectric loss of coil and measured capacitance value, the lightning arrester of each side of transformer is removed; The lOkV lightning arrester is removed from lead-in wire, and 35kV and above lightning arrester are taken apart from lightning arrester base and ground phase short circuit;
The dielectric loss of sleeve pipe and measured capacitance value, winding deformation calibrating, no-load voltage ratio measurement, loaded switch action test, direct current resistance m easurem ent be by the conventional methods test of prior art, finally again transformer carried out to end-of-job after demagnetization;
By the corresponding capacitance of bushing amount of the capacitance of bushing amount in " measurement data " and sleeve pipe in " raw data " relatively, when the two the absolute value of measures of dispersion be less than or equal to electric capacity corresponding in " raw data " 5% the time, think that sleeve pipe is normal, when the measures of dispersion of the two is greater than the electric capacity 5% of " raw data " correspondence, carry out malfunction elimination.
Further, the rated current >=0.8mA of described megohmmeter.
Further, described megohmmeter E end output voltage is 4000V～6000V.
Further, forward conduction electric current >=3A of described unilateral diode D.
Good effect of the present invention is: the test method that has proposed a set of brand-new power transformer, according to test figure, analyzed, as without extremely determining the transformer normal operation, occur when abnormal, then compare and do further minute folding and judgement with " raw data ".This test method, when no matter transformer is regular inspection or preventive trial, can not be torn each example lead-in wire of transformer open transformer is tested, and has so not only reduced power off time but also has saved a large amount of human and material resources, financial resources, has guaranteed again safety simultaneously.
Embodiment
Below in conjunction with specific embodiment, the present invention is described further.
The step of test method of the present invention is:
Before putting into operation, transformer measures one group of data as " raw data " in the situation that do not connect each side lead-in wire, measure again one group of data as " basic data " after connecting each side lead-in wire, when this transformer is done experiment, in the situation that do not remove the lead-in wire that transformer is connected with miscellaneous equipment, the test figure and " basic data " that draw are compared;
At first oneself is had a power failure and carries out the power transformer of safety practice, remove successively the ground wire of each side, test lead when projects are tested directly is connected on the sleeve pipe top successively, has recorded environment temperature, humidity and transformer body temperature simultaneously, and concrete test method step is:
1) transformer core and clamp insulation are measured: by each side short circuit grounding of transformer;
2) insulation resistance of each winding and sleeve of transformer: by the G of megohmmeter end ground connection, respectively by the winding to be tested of the L of megohmmeter end and transformer, iron core and folder connect, be in series with unilateral diode D between the winding to be tested of L end and transformer, the L end is by the rear ground connection of capacitor C 1, the positive pole of described unilateral diode D is connected with the L end, the E of megohmmeter end is connected with the winding non-to be tested of transformer, described winding to be tested is respectively the high pressure winding, the low pressure winding, without winding, obtain respectively high pressure winding and the iron core insulation resistance R1 to the low pressure winding, low pressure winding and the iron core insulation resistance R2 to the high pressure winding, the insulation resistance R3 of iron core to senior middle school's low pressure winding, this test result is as the insulating resistance value in " measurement data ",
3) analyze the insulating resistance value R of winding: the insulating resistance value in " measurement data " is compared with resistance value corresponding in " raw data ", when the insulating resistance value in " measurement data " is more than or equal to 1.3 times of insulating resistance value corresponding to " raw data ", between each winding, insulation is good, the one group of insulating resistance value that has at least in " measurement data " is less than 1.3 times of insulating resistance value corresponding to " raw data ", but while being greater than " raw data " corresponding insulating resistance value, by the middle insulating resistance value of itself and " basic data " relatively, when the insulating resistance value in " measurement data " is more than or equal to 0.7 times of insulating resistance value corresponding in " basic data ", between each winding, insulation is good, when in " measurement data " one group or two groups of insulating resistance values are less than 0.7 times of insulating resistance value corresponding in " basic data ", carry out the transformer oil test, the hidden danger existed to get rid of transformer, insulation resistance numerical value in " measurement data " all is less than 0.7 times of insulating resistance value corresponding in " basic data ", or the insulating resistance value in " measurement data " is while being less than or equal to insulating resistance value corresponding in " raw data ", transformer is returned to the repair in shop reason,
4) sleeve pipe is together with the leakage current measurement of winding: while surveying high-pressure side, the high-voltage connection of high voltage direct current generator connects step-up side, non-tested winding connects the shielding end of high voltage direct current generator high-voltage connection, in like manner the like measure the leakage current values of other winding;
The winding leakage current recorded is compared with the winding leakage current in " raw data ", when the two the absolute value of measures of dispersion be less than or equal to " raw data " corresponding leakage current 5% the time, leakage current is in safe range, when the two the absolute value of measures of dispersion be greater than " raw data " corresponding leakage current 5% the time, carry out malfunction elimination.
5) sleeve pipe is together with dielectric loss and the measured capacitance value of coil: for the transformer of voltage levels as 110kV and more than, when carrying out sleeve pipe together with the dielectric loss of coil and measured capacitance value, the lightning arrester of each side of transformer is removed; The lOkV lightning arrester is removed from lead-in wire, and 35kV and above lightning arrester are taken apart from lightning arrester base and ground phase short circuit;
The dielectric loss of sleeve pipe and measured capacitance value, winding deformation calibrating, no-load voltage ratio measurement, loaded switch action test, direct current resistance m easurem ent be by the conventional methods test of prior art, finally again transformer carried out to end-of-job after demagnetization;
By the corresponding capacitance of bushing amount of the capacitance of bushing amount in " measurement data " and sleeve pipe in " raw data " relatively, when the two the absolute value of measures of dispersion be less than or equal to electric capacity corresponding in " raw data " 5% the time, think that sleeve pipe is normal, when the measures of dispersion of the two is greater than the electric capacity 5% of " raw data " correspondence, carry out malfunction elimination.
Further, the rated current >=0.8mA of described megohmmeter.
Further, described megohmmeter E end output voltage is 4000V～6000V.
Further, forward conduction electric current >=3A of described unilateral diode D.
The foregoing is only preferred embodiment of the present invention, in order to limit the present invention, within the spirit and principles in the present invention not all, any modification of doing, be equal to replacement, improvement etc., within all should being included in protection scope of the present invention.
Claims (4)
1. a power transformer test method is characterized in that:
Before putting into operation, transformer measures one group of data as " raw data " in the situation that do not connect each side lead-in wire, measure again one group of data as " basic data " after connecting each side lead-in wire, when this transformer is done experiment, in the situation that do not remove the lead-in wire that transformer is connected with miscellaneous equipment, the test figure and " basic data " that draw are compared;
At first oneself is had a power failure and carries out the power transformer of safety practice, remove successively the ground wire of each side, test lead when projects are tested directly is connected on the sleeve pipe top successively, has recorded environment temperature, humidity and transformer body temperature simultaneously, and concrete test method step is:
1) transformer core and clamp insulation are measured: by each side short circuit grounding of transformer;
2) insulation resistance of each winding and sleeve of transformer: by the G of megohmmeter end ground connection, respectively by the winding to be tested of the L of megohmmeter end and transformer, iron core and folder connect, be in series with unilateral diode D between the winding to be tested of L end and transformer, the L end is by the rear ground connection of capacitor C 1, the positive pole of described unilateral diode D is connected with the L end, the E of megohmmeter end is connected with the winding non-to be tested of transformer, described winding to be tested is respectively the high pressure winding, the low pressure winding, without winding, obtain respectively high pressure winding and the iron core insulation resistance R1 to the low pressure winding, low pressure winding and the iron core insulation resistance R2 to the high pressure winding, the insulation resistance R3 of iron core to senior middle school's low pressure winding, this test result is as the insulating resistance value in " measurement data ",
3) analyze the insulating resistance value R of winding: the insulating resistance value in " measurement data " is compared with resistance value corresponding in " raw data ", when the insulating resistance value in " measurement data " is more than or equal to 1.3 times of insulating resistance value corresponding to " raw data ", between each winding, insulation is good, the one group of insulating resistance value that has at least in " measurement data " is less than 1.3 times of insulating resistance value corresponding to " raw data ", but while being greater than " raw data " corresponding insulating resistance value, by the middle insulating resistance value of itself and " basic data " relatively, when the insulating resistance value in " measurement data " is more than or equal to 0.7 times of insulating resistance value corresponding in " basic data ", between each winding, insulation is good, when in " measurement data " one group or two groups of insulating resistance values are less than 0.7 times of insulating resistance value corresponding in " basic data ", carry out the transformer oil test, the hidden danger existed to get rid of transformer, insulation resistance numerical value in " measurement data " all is less than 0.7 times of insulating resistance value corresponding in " basic data ", or the insulating resistance value in " measurement data " is while being less than or equal to insulating resistance value corresponding in " raw data ", transformer is returned to the repair in shop reason,
4) sleeve pipe is together with the leakage current measurement of winding: while surveying high-pressure side, the high-voltage connection of high voltage direct current generator connects step-up side, non-tested winding connects the shielding end of high voltage direct current generator high-voltage connection, in like manner the like measure the leakage current values of other winding;
The winding leakage current recorded is compared with the winding leakage current in " raw data ", when the two the absolute value of measures of dispersion be less than or equal to " raw data " corresponding leakage current 5% the time, leakage current is in safe range, when the two the absolute value of measures of dispersion be greater than " raw data " corresponding leakage current 5% the time, carry out malfunction elimination.
5) sleeve pipe is together with dielectric loss and the measured capacitance value of coil: for the transformer of voltage levels as 110kV and more than, when carrying out sleeve pipe together with the dielectric loss of coil and measured capacitance value, the lightning arrester of each side of transformer is removed; The lOkV lightning arrester is removed from lead-in wire, and 35kV and above lightning arrester are taken apart from lightning arrester base and ground phase short circuit;
The dielectric loss of sleeve pipe and measured capacitance value, winding deformation calibrating, no-load voltage ratio measurement, loaded switch action test, direct current resistance m easurem ent be by the conventional methods test of prior art, finally again transformer carried out to end-of-job after demagnetization;
By the corresponding capacitance of bushing amount of the capacitance of bushing amount in " measurement data " and sleeve pipe in " raw data " relatively, when the two the absolute value of measures of dispersion be less than or equal to electric capacity corresponding in " raw data " 5% the time, think that sleeve pipe is normal, when the measures of dispersion of the two is greater than the electric capacity 5% of " raw data " correspondence, carry out malfunction elimination.
2. power transformer test method according to claim 1, is characterized in that: the rated current >=0.8mA of described megohmmeter.
3. power transformer test method according to claim 1 is characterized in that: described megohmmeter E end output voltage is 4000V～6000V.
4. power transformer test method according to claim 1, is characterized in that: forward conduction electric current >=3A of described unilateral diode D.
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| CN2013104209416A CN103454536A (en) | 2013-09-16 | 2013-09-16 | Power transformer test method |
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| CN2013104209416A CN103454536A (en) | 2013-09-16 | 2013-09-16 | Power transformer test method |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107807282A (en) * | 2017-10-31 | 2018-03-16 | 国网福建省电力有限公司 | The method of tested media loss factor and capacitance under transformer non-dismantle high voltages fuse |
| CN108732512A (en) * | 2018-06-13 | 2018-11-02 | 任志广 | A kind of data collection module applied to high voltage power supply |
| CN108872771A (en) * | 2018-07-11 | 2018-11-23 | 云南电网有限责任公司电力科学研究院 | A kind of transformer preventive trial equivalent method |
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| US4201089A (en) * | 1976-10-08 | 1980-05-06 | Elin-Union Aktiengesellschaft | Temperature measuring device for transformers and reactors |
| EP0337171A1 (en) * | 1988-04-15 | 1989-10-18 | Daimler-Benz Aktiengesellschaft | Method for the contactless measuring of a resistor arranged in the secondary circuit of a transmitter, and device for carrying out the method |
| CN101354418A (en) * | 2008-09-22 | 2009-01-28 | 河南省电力公司商丘供电公司 | Power transformer test method without disconnecting wire |
| CN101806841A (en) * | 2009-12-30 | 2010-08-18 | 四川中鼎科技有限公司 | Method for determining test parameter of winding and sleeve of power transformer |
| CN102735959A (en) * | 2012-05-29 | 2012-10-17 | 辽宁省电力有限公司 | On-line ultrahigh-voltage line power transformer test method |
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2013
- 2013-09-16 CN CN2013104209416A patent/CN103454536A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4201089A (en) * | 1976-10-08 | 1980-05-06 | Elin-Union Aktiengesellschaft | Temperature measuring device for transformers and reactors |
| EP0337171A1 (en) * | 1988-04-15 | 1989-10-18 | Daimler-Benz Aktiengesellschaft | Method for the contactless measuring of a resistor arranged in the secondary circuit of a transmitter, and device for carrying out the method |
| CN101354418A (en) * | 2008-09-22 | 2009-01-28 | 河南省电力公司商丘供电公司 | Power transformer test method without disconnecting wire |
| CN101806841A (en) * | 2009-12-30 | 2010-08-18 | 四川中鼎科技有限公司 | Method for determining test parameter of winding and sleeve of power transformer |
| CN102735959A (en) * | 2012-05-29 | 2012-10-17 | 辽宁省电力有限公司 | On-line ultrahigh-voltage line power transformer test method |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107807282A (en) * | 2017-10-31 | 2018-03-16 | 国网福建省电力有限公司 | The method of tested media loss factor and capacitance under transformer non-dismantle high voltages fuse |
| CN108732512A (en) * | 2018-06-13 | 2018-11-02 | 任志广 | A kind of data collection module applied to high voltage power supply |
| CN108732512B (en) * | 2018-06-13 | 2020-11-24 | 任志广 | Data collection module applied to high-voltage power supply |
| CN108872771A (en) * | 2018-07-11 | 2018-11-23 | 云南电网有限责任公司电力科学研究院 | A kind of transformer preventive trial equivalent method |
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Owner name: JIAOZUO POWER SUPPLY COMPANY, STATE GRID HUNAN ELE Effective date: 20131126 Owner name: STATE ELECTRIC NET CROP. Free format text: FORMER OWNER: JIAOZUO POWER SUPPLY COMPANY, STATE GRID HUNAN ELECTRIC POWER COMPANY Effective date: 20131126 |
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Effective date of registration: 20131126 Address after: 100031 West Street, Beijing, Xicheng District, No. 86, No. Applicant after: State Grid Corporation of China Applicant after: Jiaozuo Power Supply Company of State Grid Henan Electric Power Company Address before: 454150 No. 299 South Tower Road, Henan, Jiaozuo Applicant before: Jiaozuo Power Supply Company of State Grid Henan Electric Power Company |
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