CN108508330A - Industrial frequency AC resistance test method - Google Patents
Industrial frequency AC resistance test method Download PDFInfo
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- CN108508330A CN108508330A CN201710105330.0A CN201710105330A CN108508330A CN 108508330 A CN108508330 A CN 108508330A CN 201710105330 A CN201710105330 A CN 201710105330A CN 108508330 A CN108508330 A CN 108508330A
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- voltage
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- industrial frequency
- pressure
- test item
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/12—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Testing Relating To Insulation (AREA)
Abstract
The present invention relates to industrial frequency AC resistance test methods, belong to industrial frequency withstand voltage detection technique field；Preresearch estimates is carried out according to the test voltage of test item and capacitance, selects suitable experiment voltage adjusting device and relevant device；The power supply for cutting off test item, removes or disconnects all lines associated therewith；Ambient conditions when record experiment, atmospheric pressure and temperature；The Level tune screw for adjusting electrostatic voltmeter bottom chooses each range in relation to instrument until its spirit level instruction electrostatic voltmeter is horizontal.Technique thinking is clear, facilitate implementation, it can be with smooth adjustment voltage, and it can obtain being higher than except the major advantage of the output voltage of input voltage, also have leakage reactance it is small, be lost small and wave distortion it is small, it avoids tested device from causing unnecessary insulation breakdown when carrying out ac voltage withstanding, shortens the repair time, extend service life of equipment.
Description
Technical field
The present invention relates to industrial frequency AC resistance test methods, belong to industrial frequency withstand voltage detection technique field.
Background technology
The insulation degradation situation of electrical equipment generally can be divided into two classes.One kind is that generality deterioration electrical equipment is transported for a long time
Insulation gradual outmoded and aging under the action of high temperature, electric field and vibration in row.Another kind of is that locality defect electrical equipment exists
It usually will appear local defect in operation due to various reasons.The development speed of this local defect insulation weak-point is more bad than universal
Therefore change development has prodigious danger soon.Industrial frequency AC pressure test is to identify insulation of electrical installation situation most effective and most
Direct method it to may determine that can electrical equipment continue to run be also a kind of important hand for avoiding generation insulation fault simultaneously
Section
Voltage waveform, frequency and the voltage's distribiuting in test item insulation of ac voltage withstanding experiment, and actual motion
Situation is consistent, but the test voltage applied is more than working voltage height.It can be seen that it is more harsher than operating status
Under conditions of test to the dielectric level of equipment, therefore can effectively find generality deterioration and two class of locality defect lack
It falls into, especially to locality defect, Checking on effect is more prominent.But for poor insulation, it is a kind of to a certain extent
Destructive testing, therefore ac voltage withstanding experiment should be surveyed in test item insulation resistance, absorptance, leakage current measurement, dielectric loss
The standard that ac voltage withstanding test voltage and test period are carried out after the pilot projects such as amount are qualified is one and more complicated asks
Topic, due to different types of electrical equipment, structure is different, and with occasion difference, the requirement to insulating materials is also just different.Such as it sends out
Whether solid is also in the high voltage electric equipments such as motor, large and medium-sized transformer, high-tension cable, high-tension motor, high-voltage capacitor
The electricity of higher pulse in short-term will be still suffered from while bearing the power-frequency voltage of long-term alternation by being the insulating materials of liquid
Pressure.In addition the influence of other factors is still suffered from.In the equipment such as high-voltage motor, generator operating temperature often 100 DEG C with
On, the insulator mounted in outside wire road frequently suffers from the influence of temperature and humidity acute variation, to suspension type and supported exhausted
Edge is also acted on by mechanical load, although the insulation in the low voltage equipments such as low voltage motor is generally not subject to pulse electricity
Pressure, is solely subjected to long-term alternating voltage or DC voltage, but the temperature that afford larger mechanical stress sometimes and be changed significantly
The influence of degree and humidity.
Invention content
In view of the defects and deficiencies of the prior art, the present invention intends to provide a kind of simple in structure, reasonable design makes
With convenient industrial frequency AC resistance test method.
To achieve the above object, the technical solution adopted by the present invention is：It is comprised the steps of：
1. early-stage preparations：Confirm that each parameter of test item is all qualified, then carries out ac voltage withstanding experiment；
2. carrying out preresearch estimates according to the test voltage of test item and capacitance, suitable experiment voltage adjusting device and phase are selected
Close equipment；
3. cutting off the power supply of test item, all lines associated therewith are removed or disconnected；
4. ambient conditions when record experiment, atmospheric pressure and temperature；
5. the Level tune screw of electrostatic voltmeter bottom is adjusted, until its spirit level instruction electrostatic voltmeter is in level
Until position, each range in relation to instrument is chosen；
6. carry out no-load test first, wiring is carried out by test principle figure, testing equipment arrangement will it is rationally easy to operation simultaneously
Meet the regulation in safety code；
7. determining test area after nobody, blocking test region；
8. confirming that pressure regulator adjusting pressuring knob is in zero-bit；
9. connecting Power Frequency High Voltage Test voltage control platform power supply, closing a floodgate and uniformly boosting, the rate of rise is in 70% experiment electricity
Can be unrestricted within pressure, it should uniformly boost thereafter, speed is about per second 3% test voltage；
10. applying different voltage, testing transformer low-pressure side voltage table is recorded respectively, winding voltage table is measured, is quiet
The numerical value of piezoelectric voltage table, divider low-pressure side voltage table, with pressure regulator output voltage, i.e. testing transformer low-pressure side voltage table is read
Number is abscissa, to measure the surveyed voltage of winding, the surveyed voltage of electrostatic voltmeter, the surveyed voltage of divider as ordinate, respectively
Make no-load characteristic；
11. the step of successively accessing in test loop, repeat 7-10 two kinds of different test items of capacitance, makes two
Different dynamic characteristics；
12. by distance corresponding when ball gap is adjusted to 1.2 times of test voltage is measured, ball gap is as overvoltage protection at this time
Device；
13. electrostatic voltmeter is removed from test loop, test item industrial frequency withstand voltage is found from dynamic characteristic
Test voltage；
14. operation is completed, cuts off the power, grounding rod is hung over into testing transformer high-pressure side；
15. measuring the insulation resistance of test item after pressure test.
Preferably, each earth point answers solid and reliable ground connection in test loop in the step 6.
Preferably, forbidding to be pressurizeed to test product with the method for Switching impulse in the step 8.
Preferably, step 2 voltage adjusting device should meet：Adjusting, defeated that can be smooth to the range of full voltage from zero
The waveform for going out voltage should be with testing transformer phase as close possible to sine wave, the rated output voltage of pressure regulator and rated capacity
Match.
When test item capacitance is larger, there are two types of the modes that measure high voltage, and one is utilized in the high-pressure side of test item
Directly measure, the high voltage that " hold rise " effect generates avoided to destroy the insulation of test item, another kind be utilized in test item do it is negative
It carries；
When the present invention operates, high pressure line is as short as possible when wiring, as defined in ground wire or the holding of other ground connection objects
Safe distance；
Boosting will start from scratch, and the rate of rise has to comply with prescribed requirement；
High-voltage test finishes, it is necessary to just allow access into trial zone after deenergization, into after examination area, first have to be grounded
Stick hangs over testing transformer high-pressure side, is looked on calibration curve when to avoid the accident for forgetting to cut off the power caused by equal maloperations
Take test voltage value.
With the above structure, the present invention has the beneficial effect that：Industrial frequency AC resistance test method of the present invention, technique
Thinking is clear, facilitates implementation, can be with smooth adjustment voltage, and can obtain the major advantage of the output voltage higher than input voltage
Except, also have leakage reactance it is small, be lost small and wave distortion it is small, avoid tested device from being caused when carrying out ac voltage withstanding unnecessary
Insulation breakdown shortens the repair time, extends service life of equipment.
Specific implementation mode
Present embodiment comprises the steps of：
1. early-stage preparations：Confirm test item insulation measurement, dielectric loss measurement, the measurement of DC leakage-current and Jie
The experiments such as matter loss measurement are all qualified, can carry out ac voltage withstanding experiment；
2. carrying out preresearch estimates according to the test voltage of test item and capacitance, suitable experiment voltage adjusting device and phase are selected
Close equipment；
3. cutting off the power supply of test item, all lines associated therewith are removed or disconnected；
4. ambient conditions when record experiment, atmospheric pressure and temperature；
5. the Level tune screw of electrostatic voltmeter bottom is adjusted, until its spirit level instruction electrostatic voltmeter is in level
Until position, each range in relation to instrument is chosen；
6. carry out no-load test first, wiring is carried out by test principle figure, testing equipment arrangement will it is rationally easy to operation simultaneously
Meet the regulation in safety code；
7. determining test area after nobody, blocking test region；
8. confirming that pressure regulator adjusting pressuring knob is in zero-bit；
9. connecting Power Frequency High Voltage Test voltage control platform power supply, closing a floodgate and uniformly boosting, the rate of rise is in 70% experiment electricity
Can be unrestricted within pressure, it should uniformly boost thereafter, speed is about per second 3% test voltage；
10. applying different voltage, testing transformer low-pressure side voltage table is recorded respectively, winding voltage table is measured, is quiet
The numerical value of piezoelectric voltage table, divider low-pressure side voltage table, with pressure regulator output voltage, i.e. testing transformer low-pressure side voltage table is read
Number is abscissa, to measure the surveyed voltage of winding, the surveyed voltage of electrostatic voltmeter, the surveyed voltage of divider as ordinate, respectively
Make no-load characteristic；
11. the step of successively accessing in test loop, repeat 7-10 two kinds of different test items of capacitance, makes two
Different dynamic characteristics；
12. by distance corresponding when ball gap is adjusted to 1.2 times of test voltage is measured, ball gap is as overvoltage protection at this time
Device；
13. electrostatic voltmeter is removed from test loop, test item industrial frequency withstand voltage is found from dynamic characteristic
Test voltage；
14. operation is completed, cuts off the power, grounding rod is hung over into testing transformer high-pressure side；
15. measuring the insulation resistance of test item after pressure test.
Wherein, step 2 voltage adjusting device should meet：From zero to the range of full voltage can be smooth adjusting, output electricity
The waveform of pressure should match as close possible to sine wave, the rated output voltage of pressure regulator and rated capacity with testing transformer；
Each earth point answers solid and reliable ground connection in test loop in the step 6；Forbid in the step 8 with the method for Switching impulse to
Test product pressurizes.
When test item capacitance is larger, there are two types of the modes that measure high voltage, and one is utilized in the high-pressure side of test item
Directly measure, the high voltage that " hold rise " effect generates avoided to destroy the insulation of test item, another kind be utilized in test item do it is negative
It carries；High pressure line is as short as possible when wiring, and defined safe distance is kept with ground wire or other ground connection objects；Boosting will be from zero
Start, the rate of rise has to comply with prescribed requirement；High-voltage test finishes, it is necessary to trial zone is just allowed access into after deenergization,
It into after examination area, first has to grounding rod hanging over testing transformer high-pressure side, waits maloperations to be made to avoid forgetting to cut off the power
At accident when calibration curve on look into and take test voltage value.
With the above structure, present embodiment has the beneficial effect that：Industrial frequency AC described in present embodiment
Resistance test method, technique thinking is clear, facilitates implementation, can be with smooth adjustment voltage, and can obtain higher than input voltage
Except the major advantage of output voltage, also have leakage reactance it is small, be lost small and wave distortion it is small, avoid tested device from being exchanged
Unnecessary insulation breakdown is caused when pressure-resistant, shortens the repair time, extends service life of equipment.
The above is merely illustrative of the technical solution of the present invention and unrestricted, and those of ordinary skill in the art are to this hair
The other modifications or equivalent replacement that bright technical solution is made, as long as it does not depart from the spirit and scope of the technical scheme of the present invention,
It is intended to be within the scope of the claims of the invention.
Claims (4)
1. industrial frequency AC resistance test method, it is characterised in that：It is comprised the steps of：
(1) early-stage preparations：Confirm that each parameter of test item is all qualified, then carries out ac voltage withstanding experiment；
(2) carries out preresearch estimates according to the test voltage of test item with capacitance, selects suitable experiment voltage adjusting device and correlation
Equipment；
(3) cuts off the power supply of test item, removes or disconnect all lines associated therewith；
(4) ambient conditions when experiment of records, atmospheric pressure and temperature；
(5) adjusts the Level tune screw of electrostatic voltmeter bottom, until its spirit level instruction electrostatic voltmeter is in horizontal position
It is set to and only chooses each range in relation to instrument；
(6) carries out no-load test first, carries out wiring by test principle figure, testing equipment arrangement will be rationally easy to operation and be accorded with
Close the regulation in safety code；
(7) determines test area after nobody, blocking test region；
(8) confirms that pressure regulator adjusting pressuring knob is in zero-bit；
(9) connects Power Frequency High Voltage Test voltage control platform power supply, closes a floodgate and uniformly boosts, the rate of rise is in 70% test voltage
Within can be unrestricted, should uniformly boost thereafter, speed is about per second 3% test voltage；
(10) applies different voltage, records testing transformer low-pressure side voltage table respectively, measures winding voltage table, electrostatic
The numerical value of voltmeter, divider low-pressure side voltage table, with pressure regulator output voltage, i.e. testing transformer low-pressure side voltage meter reading
It is done respectively for abscissa using measuring the surveyed voltage of winding, the surveyed voltage of electrostatic voltmeter, the surveyed voltage of divider as ordinate
Go out no-load characteristic；
(11) the step of is by two kinds of different test items of capacitance successively access test loop, 7-10 is repeated, makes two not
Same dynamic characteristic；
(12) will measure distance corresponding when ball gap is adjusted to 1.2 times of test voltage, and ball gap is as overvoltage protection dress at this time
It sets；
(13) removes electrostatic voltmeter from test loop, and the examination of test item industrial frequency withstand voltage is found from dynamic characteristic
Electrical verification pressure；
(14) operations are completed, and cut off the power, grounding rod is hung over testing transformer high-pressure side；
(15) insulation resistance of test item is measured after pressure tests.
2. industrial frequency AC resistance test method according to claim 1, it is characterised in that：It is tested back in the step (6)
Each earth point answers solid and reliable ground connection in road.
3. industrial frequency AC resistance test method according to claim 1, it is characterised in that：Forbid to use in the step (8)
The method of Switching impulse is pressurizeed to test product.
4. industrial frequency AC resistance test method according to claim 1, it is characterised in that：Step (2) voltage adjusting device
It should meet：From zero to the range of full voltage can be smooth adjusting, output voltage waveform as close possible to sine wave, pressure regulator
Rated output voltage and rated capacity should match with testing transformer.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710105330.0A CN108508330A (en) | 2017-02-26 | 2017-02-26 | Industrial frequency AC resistance test method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710105330.0A CN108508330A (en) | 2017-02-26 | 2017-02-26 | Industrial frequency AC resistance test method |
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| Publication Number | Publication Date |
|---|---|
| CN108508330A true CN108508330A (en) | 2018-09-07 |
Family
ID=63372997
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710105330.0A Withdrawn CN108508330A (en) | 2017-02-26 | 2017-02-26 | Industrial frequency AC resistance test method |
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| CN (1) | CN108508330A (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111474448A (en) * | 2020-02-24 | 2020-07-31 | 中国南方电网有限责任公司超高压输电公司检修试验中心 | Method for determining withstand voltage value of factory test after maintenance of converter transformer |
| CN113156283A (en) * | 2021-04-27 | 2021-07-23 | 广东省源天工程有限公司 | Anti-interference method for withstand voltage test of 110kv transformer |
| CN115453423A (en) * | 2022-08-29 | 2022-12-09 | 贵州长征输配电电气有限公司 | Alternating current withstand voltage test method for power transformer |
| CN116626456A (en) * | 2023-07-24 | 2023-08-22 | 国网天津市电力公司高压分公司 | External voltage withstand test equipment for power transformer |
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|---|---|---|---|---|
| CN102780234A (en) * | 2012-08-08 | 2012-11-14 | 中国二十二冶集团有限公司 | High-voltage electric debugging method for power generation project |
| CN203551730U (en) * | 2013-10-24 | 2014-04-16 | 国家电网公司 | A composite post insulator power-frequency voltage-withstand testing device |
| CN104950149A (en) * | 2014-03-24 | 2015-09-30 | 国家电网公司 | Electronic power-frequency voltage-withstand test voltage-regulating device, test wiring circuit and test voltage-regulating method |
-
2017
- 2017-02-26 CN CN201710105330.0A patent/CN108508330A/en not_active Withdrawn
Patent Citations (3)
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|---|---|---|---|---|
| CN102780234A (en) * | 2012-08-08 | 2012-11-14 | 中国二十二冶集团有限公司 | High-voltage electric debugging method for power generation project |
| CN203551730U (en) * | 2013-10-24 | 2014-04-16 | 国家电网公司 | A composite post insulator power-frequency voltage-withstand testing device |
| CN104950149A (en) * | 2014-03-24 | 2015-09-30 | 国家电网公司 | Electronic power-frequency voltage-withstand test voltage-regulating device, test wiring circuit and test voltage-regulating method |
Non-Patent Citations (1)
| Title |
|---|
| 无: "工频耐压试验指导书", 《豆丁网》 * |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111474448A (en) * | 2020-02-24 | 2020-07-31 | 中国南方电网有限责任公司超高压输电公司检修试验中心 | Method for determining withstand voltage value of factory test after maintenance of converter transformer |
| CN111474448B (en) * | 2020-02-24 | 2022-05-17 | 中国南方电网有限责任公司超高压输电公司检修试验中心 | Method for determining withstand voltage value of factory test after maintenance of converter transformer |
| CN113156283A (en) * | 2021-04-27 | 2021-07-23 | 广东省源天工程有限公司 | Anti-interference method for withstand voltage test of 110kv transformer |
| CN113156283B (en) * | 2021-04-27 | 2021-12-24 | 广东省源天工程有限公司 | Anti-interference method for withstand voltage test of 110kv transformer |
| CN115453423A (en) * | 2022-08-29 | 2022-12-09 | 贵州长征输配电电气有限公司 | Alternating current withstand voltage test method for power transformer |
| CN116626456A (en) * | 2023-07-24 | 2023-08-22 | 国网天津市电力公司高压分公司 | External voltage withstand test equipment for power transformer |
| CN116626456B (en) * | 2023-07-24 | 2023-09-29 | 国网天津市电力公司高压分公司 | External voltage withstand test equipment for power transformer |
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Application publication date: 20180907 |