CN203786255U - Power transformer power frequency withstand voltage test apparatus - Google Patents
Power transformer power frequency withstand voltage test apparatus Download PDFInfo
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- CN203786255U CN203786255U CN201420130916.4U CN201420130916U CN203786255U CN 203786255 U CN203786255 U CN 203786255U CN 201420130916 U CN201420130916 U CN 201420130916U CN 203786255 U CN203786255 U CN 203786255U
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- 238000012360 testing method Methods 0.000 title claims abstract description 47
- 239000003990 capacitor Substances 0.000 claims abstract description 7
- 238000009434 installation Methods 0.000 abstract description 2
- 230000005284 excitation Effects 0.000 abstract 1
- 238000010586 diagram Methods 0.000 description 4
- 238000009413 insulation Methods 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 238000010998 test method Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
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Abstract
The utility model discloses a power transformer power frequency withstand voltage test apparatus in the electrical property test apparatus technology field. In the prior art, because a tested transformer to ground capacitance is dispersed, a power frequency withstand voltage test frequency can not satisfy a test need. The apparatus of the utility model aims at solving the above technical problem. The apparatus comprises a variable-frequency power supply, an excitation transformer and a resonance circuit. The resonance circuit comprises a tested power transformer, an electric reactor, a fixed frequency capacitor and a capacitive voltage divider. The fixed frequency capacitor is connected in parallel with the capacitive voltage divider and then is connected in series with the electric reactor. A tested side of the tested power transformer is in a short circuit state and then is connected to one end of the fixed frequency capacitor. The other side of the tested power transformer is in the short circuit state and then is grounded. A shell of the tested power transformer is grounded. Without an adjustable reactor, a test frequency can be guaranteed to satisfy a power frequency withstand voltage need. The size, the weight and production cost of the apparatus are reduced. On-site carrying and combination installation are convenient. The apparatus has high flexibility.
Description
Technical field
The utility model relates to a kind of test unit, and particularly a kind of power transformer power frequency withstand test device, belongs to electric performance testing device technical field.
Background technology
Power frequency withstand test, applies power-frequency voltage to test specimen, to check the insulation ability to bear of test specimen to Power frequency voltage rising, is the most effective and the most direct test method of qualification test specimen dielectric strength, is also one of test method often adopting.Tradition industrial frequency withstand voltage equipment mainly utilizes testing transformer, the principle of work of testing transformer is identical with power transformer, through electromagnetic coupled, low voltage is risen to required high voltage, testing transformer is powered by pressure regulator conventionally, to export adjustable power frequency high voltage.But under power frequency condition, because test specimen electric capacity is larger, or trial voltage is had relatively high expectations, the power supply capacity of test unit is also had to higher requirement accordingly, often single-piece volume is large for traditional industrial frequency withstand voltage device, and Heavy Weight, is not easy to onsite moving, and being not easy to combination in any, dirigibility is poor.At present, reasonable method is to adopt the method for frequency conversion resonance vibration to carry out withstand voltage test.
Variable-frequency series resonance test device is made up of variable-frequency power sources, exciting transformer, reactor and capacitive divider.The electric capacity of test specimen and reactor form series resonance connected mode; Voltage divider is connected in parallel on test specimen, for measuring the resonance potential on test specimen, and makes overvoltage protection signal; Frequency modulation power stage is coupled to series resonant tank through driver transformer, and the exciting power of series resonance is provided.Its test frequency is determined by the inductance value of test specimen ground capacitance and current-limiting reactor.But for test specimen is power transformer, because tested power transformer ground capacitance relatively disperses, in the time carrying out industrial frequency withstand voltage, very difficult warranty test frequency can meet the needs of industrial frequency withstand voltage.
Known according to investigation and transformer parameter collection, the each lateral capacitance amount of domestic power transformer is generally distributed within the scope of the p F of 2000pF～38000, general 28kV～184 kV of trial voltage.IEC standard specifies that to the commerical test frequency range of High-Voltage Insulation be 45-65Hz.Be 50Hz in the specified power frequency of China, GB/T16927.1-1997 regulation industrial frequency experiment frequency range is 45-55Hz.According to following formula
C=2000pF～38000 pF =45～55Hz
Can be calculated:
L=220～6291H
For warranty test frequency, this just requires the reactor can Field adjustment inductance value.Adjust not only bulky complex structure of sense reactor, and expensive, and be not suitable for on-the-spot power frequency withstand test.
Utility model content
The purpose of this utility model is to overcome deficiency of the prior art, a kind of power transformer power frequency withstand test device is provided, solves in prior art and can not meet the technical matters of test needs because tested transformer ground capacitance disperses to cause power frequency withstand test frequency.
The purpose of this utility model is achieved in that a kind of power transformer power frequency withstand test device, comprise variable-frequency power sources, exciting transformer and resonant circuit, the primary side of described exciting transformer is connected with the output terminal of variable-frequency power sources, the secondary side of exciting transformer is connected with the input end of resonant circuit, and three-phase alternating-current supply provides trial voltage by variable-frequency power sources and exciting transformer for resonant circuit; Described resonant circuit comprises tested power transformer, reactor, fixed electric capacity and capacitive divider frequently, after described fixed electric capacity frequently and capacitive divider parallel connection, then connects with reactor; After the tested side short circuit of described tested power transformer, be connected ground connection after the opposite side short circuit of tested power transformer, the earthing of casing of tested power transformer with fixed one end of electric capacity frequently.
The inductance value of described reactor is for being not more than 115H.
Described fixed electric capacity frequently selects electric capacity to be not less than 70900pF, and electric pressure is the high-voltage capacitor that is not less than 184kV.
When the utility model work, first by regulating the output frequency of variable-frequency power sources to make loop that series resonance occur, then under the condition of loop resonance, regulate variable-frequency power sources output voltage to make the voltage of tested power transformer reach trial value.Due to the resonance in loop, the output voltage that variable-frequency power sources is less just can produce higher trial voltage on tested power transformer.Compared with prior art, the beneficial effects of the utility model are: the tested side parallel connection at tested transformer is determined frequency electric capacity to stablize the frequency of withstand voltage test system, without adjusting sense reactor warranty test frequency to meet industrial frequency withstand voltage needs, volume, weight and the production cost of equipment are reduced, be convenient to onsite moving and combination installation, there is higher dirigibility.
Brief description of the drawings
Fig. 1 is equivalent circuit diagram of the present utility model.
Fig. 2 is the wiring diagram of tested power transformer in the utility model.
Wherein, 1 variable-frequency power sources; 2 exciting transformers; 3 tested power transformers; 3a shell; 4 reactors; 5 capacitive dividers; 6 fixed electric capacity frequently; 7 variable frequency power controllers; 8 capacitive divider gauge outfits.
Embodiment
Below in conjunction with accompanying drawing, the utility model is described in further detail.
As shown in Figure 1, be the equivalent circuit diagram of power transformer power frequency withstand test device, the decentralized capacitance of tested power transformer 3 is replaced by capacitor C x equivalence.The utility model comprises variable-frequency power sources 1, exciting transformer 2 and resonant circuit, and the primary side of exciting transformer 2 is connected with the output terminal of variable-frequency power sources 1, and the secondary side of exciting transformer 2 is connected with the input end of resonant circuit.In variable-frequency power sources 1, be connected with variable frequency power controller 7, be also connected with capacitive divider gauge outfit 8 on variable frequency power controller 7, three-phase alternating-current supply provides trial voltage by variable-frequency power sources 1 and exciting transformer 2 for resonant circuit.
Resonant circuit comprises reactor 4, tested power transformer 3, fixed electric capacity 6 and capacitive divider 5 frequently.As shown in Figure 2, be the wiring diagram of tested power transformer 3, the tested side three-phase tap wire short circuit of tested power transformer 3, is then electrically connected with the one end of determining frequency electric capacity 6.The opposite side three-phase tap of tested power transformer 3 is by ground connection after wire short circuit, and the shell 3a of tested power transformer 3 is also by wire ground connection.
Fixed electric capacity 6 is frequently connected in parallel with capacitive divider 5, and fixed electric capacity 6 is in order to stablize the frequency of withstand voltage test system frequently, and capacitive divider 5 is for measuring the resonance potential of tested power transformer 3.After fixed electric capacity 6 is frequently in parallel with capacitive divider 5, be connected in series with reactor 4 again.Capacitive divider 5, fixed electric capacity 6 frequently and tested power transformer 3 equal the electric capacity of capacitive divider 5, the fixed electric capacity of electric capacity 6 frequently and the decentralized capacitance amount three's of tested power transformer 3 summation with the common formation series resonant circuit of reactor 4, the total capacitance of series resonant circuit.
For meeting site test demand, the inductance value of reactor 4, for being not more than 115H, is not being considered the impact of capacitive divider 5 on pilot system, and fixed electric capacity 6 frequently selects electric capacity to be not less than 70900pF, and electric pressure is the high-voltage capacitor that is not less than 184kV.As considered, the electric capacity of capacitive divider 5 is on the impact of pilot system, and the fixed electric capacity of electric capacity 6 frequently need deduct the electric capacity of capacitive divider 5 in the time selecting.According to formula:
, calculate test frequency=45～55Hz, this result can meet the requirement of Power Transformer in Field power frequency withstand test completely.
The utility model is not limited to above-mentioned example; as the utility model also can be applied in the withstand voltage test of other test specimens; on the basis of the disclosed technical scheme of the utility model; those skilled in the art is according to disclosed technology contents; do not need performing creative labour just can make some replacements and distortion to some technical characterictics wherein, these replacements and distortion are all in protection domain of the present utility model.
Claims (3)
1. a power transformer power frequency withstand test device, it is characterized in that, comprise variable-frequency power sources, exciting transformer and resonant circuit, the primary side of described exciting transformer is connected with the output terminal of variable-frequency power sources, the secondary side of exciting transformer is connected with the input end of resonant circuit, and three-phase alternating-current supply provides trial voltage by variable-frequency power sources and exciting transformer for resonant circuit; Described resonant circuit comprises tested power transformer, reactor, fixed electric capacity and capacitive divider frequently, after described fixed electric capacity frequently and capacitive divider parallel connection, then connects with reactor; After the tested side short circuit of described tested power transformer, be connected ground connection after the opposite side short circuit of tested power transformer, the earthing of casing of tested power transformer with fixed one end of electric capacity frequently.
2. power transformer power frequency withstand test device according to claim 1, is characterized in that, the inductance value of described reactor is for being not more than 115H.
3. power transformer power frequency withstand test device according to claim 2, is characterized in that, described fixed electric capacity frequently selects electric capacity to be not less than 70900pF, and electric pressure is the high-voltage capacitor that is not less than 184kV.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420130916.4U CN203786255U (en) | 2014-03-21 | 2014-03-21 | Power transformer power frequency withstand voltage test apparatus |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420130916.4U CN203786255U (en) | 2014-03-21 | 2014-03-21 | Power transformer power frequency withstand voltage test apparatus |
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| Publication Number | Publication Date |
|---|---|
| CN203786255U true CN203786255U (en) | 2014-08-20 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201420130916.4U Expired - Fee Related CN203786255U (en) | 2014-03-21 | 2014-03-21 | Power transformer power frequency withstand voltage test apparatus |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104459501A (en) * | 2014-12-25 | 2015-03-25 | 中国西电电气股份有限公司 | Lightning arrester power frequency testing device and method |
| CN107478874A (en) * | 2017-09-15 | 2017-12-15 | 广西电友科技发展有限公司 | Instrument is sent in exchange examination |
| CN110398674A (en) * | 2019-08-30 | 2019-11-01 | 国网山西省电力公司电力科学研究院 | A kind of extra-high voltage parallel reactance is pressure-resistant and local discharge test device |
| CN113109684A (en) * | 2021-05-25 | 2021-07-13 | 西安热工研究院有限公司 | Large-scale steam turbine generator power frequency alternating current withstand voltage test device and method |
| 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 |
-
2014
- 2014-03-21 CN CN201420130916.4U patent/CN203786255U/en not_active Expired - Fee Related
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104459501A (en) * | 2014-12-25 | 2015-03-25 | 中国西电电气股份有限公司 | Lightning arrester power frequency testing device and method |
| CN107478874A (en) * | 2017-09-15 | 2017-12-15 | 广西电友科技发展有限公司 | Instrument is sent in exchange examination |
| CN110398674A (en) * | 2019-08-30 | 2019-11-01 | 国网山西省电力公司电力科学研究院 | A kind of extra-high voltage parallel reactance is pressure-resistant and local discharge test device |
| CN113109684A (en) * | 2021-05-25 | 2021-07-13 | 西安热工研究院有限公司 | Large-scale steam turbine generator power frequency alternating current withstand voltage test device and method |
| 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 |
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| C14 | Grant of patent or utility model | ||
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| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20140820 Termination date: 20150321 |
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| EXPY | Termination of patent right or utility model |