CN202600062U - High-voltage large-current composite thermal stability test device for high-voltage bushing - Google Patents
High-voltage large-current composite thermal stability test device for high-voltage bushing Download PDFInfo
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- CN202600062U CN202600062U CN 201220150154 CN201220150154U CN202600062U CN 202600062 U CN202600062 U CN 202600062U CN 201220150154 CN201220150154 CN 201220150154 CN 201220150154 U CN201220150154 U CN 201220150154U CN 202600062 U CN202600062 U CN 202600062U
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- 238000013112 stability test Methods 0.000 title abstract description 5
- 239000002131 composite material Substances 0.000 title abstract 2
- 238000012360 testing method Methods 0.000 claims abstract description 55
- 238000010438 heat treatment Methods 0.000 claims abstract description 12
- 239000002828 fuel tank Substances 0.000 claims description 27
- 230000006641 stabilisation Effects 0.000 claims description 19
- 238000011105 stabilization Methods 0.000 claims description 19
- 238000009413 insulation Methods 0.000 claims description 17
- 238000004804 winding Methods 0.000 claims description 15
- 150000001875 compounds Chemical class 0.000 claims description 13
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical group [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 5
- 239000007788 liquid Substances 0.000 claims description 3
- 238000000034 method Methods 0.000 abstract description 12
- 238000004088 simulation Methods 0.000 abstract 2
- 238000005485 electric heating Methods 0.000 abstract 1
- 230000000694 effects Effects 0.000 description 8
- 238000002474 experimental method Methods 0.000 description 6
- 238000010998 test method Methods 0.000 description 5
- 238000005516 engineering process Methods 0.000 description 4
- 230000009286 beneficial effect Effects 0.000 description 3
- 230000008901 benefit Effects 0.000 description 3
- 238000013461 design Methods 0.000 description 3
- 238000007796 conventional method Methods 0.000 description 2
- 230000002596 correlated effect Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000005684 electric field Effects 0.000 description 2
- 230000004888 barrier function Effects 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 230000002950 deficient Effects 0.000 description 1
- 230000005672 electromagnetic field Effects 0.000 description 1
- 230000005674 electromagnetic induction Effects 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 230000007704 transition Effects 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
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Abstract
The high-voltage large-current composite thermal stability test device for the high-voltage bushing comprises a high-voltage generator, a large-current generator, a simulation transformer oil tank and an insulating oil heating device in the oil tank, wherein the high-voltage bushing to be tested is arranged on the simulation transformer oil tank, and the insulating oil heating device is an electric heating device which utilizes an external power supply to heat insulating oil in the oil tank to a temperature of more than or equal to 90 ℃; the method is characterized in that: the current of the high-voltage generator is less than or equal to 10A, the output voltage is selected within the range of 1000V-2400 kV according to the test requirement, an output high-voltage terminal of the high-voltage generator is connected in parallel with two conducting rods of the high-voltage sleeve positioned outside the oil tank, and a low-voltage terminal of the high-voltage generator is grounded; the output voltage of the large current generator is less than or equal to 2kV, the output current is selected within the range of 200-10000A according to test requirements, and the output ends of the large current generator are respectively connected with two conductive rods which form a series circuit and are arranged at one end of the oil tank. The test that traditional needs large capacity power just can accomplish can be realized, has practiced thrift experimental cost greatly.
Description
Technical field
The utility model relates to a kind of heat stabilization test device of bushing, is specially to be employed in to carry out in the bushing heat stabilization test, loads the compound heat stabilization test device of high voltage and big electric current simultaneously, belongs to High-Voltage Electrical Appliances experimental technique field.
Background technology
Increase along with net capacity; The primary current amplitude of UHV (ultra-high voltage) and high pressure allocation transformer equipment also significantly increases; The current transformer rated current that 220kV to 500kV electrical network is used has reached more than the 3000A to 5000A, and the rated current of heavy-duty generator group or transformer is near 30kA.Need bushing to carry high voltage, big current device between these equipment and the circuit as transition; Unique because bushing running environment and present position are crucial, so detect extremely important for physical strength, insulating property and the heat stabilization test of bushing.A kind of known transformer with the bushing heat stabilization test is: sleeve pipe is inserted in the test fuel tank; Again insulating oil in the fuel tank is heated to≤90 ℃; Load test voltage then, reach a thermal steady state, the test of the unit for electrical property parameters of being correlated with again until sleeve pipe.
This heat stabilization test is the method that a kind of simulated high-pressure sleeve pipe only bears the actual operating state of action of high voltage; To have the effect of enough loads be to reach 90 ℃ of ceiling temperatures with oily temperature to come equivalence to transformer in this test method, and voltage reaches the voltage under the application conditions.But the deficiency of this kind method is: specified load current does not load through bushing simultaneously, and is not consistent with the bushing service condition of reality.Real bushing is when transformer reaches ceiling temperature when, and sleeve pipe is not only bearing high-tension effect, is also bearing the rated current moment surge current of rated current (even be several times as much as) and is acting on.The high voltage of sleeve pipe in service loading in the heat effect that is receiving the transformer heating makes insulating medium bear electric stress, and makes insulating medium take place to polarize and generate heat; The effects such as electric power that the operating big function of current produces in the sleeve pipe conducting rod and because of the heat that has a resistance through electric current, electromagnetic induction; Promptly will receive the effect and the effect of electric current greatly of the heating voltage of oil at the actual motion middle sleeve; Therefore; In the experimental test of bushing, load high voltage, big electric current and dry run temperature simultaneously and be only more reasonable, comprehensive test method.Known thermal stability test for bushing method is because of lacking electric current warming-up effect factor, and the distribution of its thermal field is partial to loose.This has also caused by present known test, after the bushing stand the test, and the phenomenon that is in operation and often has an accident.
If that adopts routine loads high voltage, big electric current in the method for test product simultaneously by testing transformer; Then require power supply capacity huge and cause damage and waste; The bushing of a 220kV3500A for example; As the 200kV that pressurizes, electric current 3500A, then require power supply capacity S=200kV * 3500A=700MVA.Chinese invention patent " live-wire examination method of extra-high voltage equipment " (application number: 200810048950.6) disclosed; Set up high capacity exactly and can simulate the charged examination equivalence extension net of actual high voltage, big current running condition; Extra-high tension units such as sleeve pipe are carried out charged examination; Verify its design, manufacturing and technologic security and reliability, this method test cost is huge; Utility model patent " transformer high-voltage sleeve pipe and the pressure testing of low pressure end daughter board try warm device " (application number: 200820054261.1) disclosed; Fuel tank is sealed with this method of hot test and can and strengthen electric current to the sleeve pipe heating, but can't load high voltage.This is because big electric current is different with the related technical barrier of high voltage, due in a set of equipment, being difficult to take into account.The utility model employing separates different function equipment; Utilize separately advantage to carry out compound technology path; Promptly adopt the high-tension apparatus and the low capacity high-current equipment of low capacity to load on method and the device that bushing makes an experiment simultaneously, be not shown in open source literature or the data.
Summary of the invention
The purpose of the utility model is the problem that proposes to background technology; The compound heat stabilization test device of a kind of bushing high-voltage large current is disclosed; Bushing is simulated the heat stabilization test under the hanging net operation state; At first the fuel tank with mounting sleeve is heated to design temperature, utilizes the low capacity high voltage installation that high voltage is put on the bushing again, also the low capacity high-current equipment is put on same bushing test product with big electric current simultaneously; This method make by thermal field, electric field and Distribution of Magnetic Field and the actual operating state of examination on the bushing in full accord after; Bushing is carried out the comprehensive thermally-stabilised examination of strictness; Reach and improve the bushing quality, further improve high voltage electric equipment operational reliability purpose.
The technical scheme of the utility model is: the compound heat stabilization test device of bushing high-voltage large current; Comprise insulating oil heating arrangement in high-voltage generator, strong current generator, analogue transformer fuel tank and the fuel tank; Bushing to be tested is installed on the analogue transformer fuel tank, and the insulating oil heating arrangement is to utilize external power supply insulating oil in the fuel tank to be heated to>=90 ℃ electric heater unit; It is characterized in that: the electric current≤10A of described high-voltage generator, output voltage are chosen in 1000V ~ 2400kV scope by testing requirements, and its output HV Terminal is positioned at outside parallelly connected, the low-voltage terminal ground connection of conducting rod of fuel tank with two bushings; Output voltage≤the 2kV of described strong current generator, output current are chosen in 200 ~ 10000A scope by testing requirements, and its output terminal is positioned at fuel tank one end conducting rod with two bushings that form series loop respectively and is connected.Its beneficial effect is: the utility model adopts a less capacity high generator to produce the required high voltage of test and the strong current generator than low capacity produces the required big electric current of test; And give respectively and wait to test bushing loading high voltage and big electric current; Comparing to provide the separate unit of high voltage and big electric current cover high capacity experiment power supply simultaneously, has reduced power supply capacity greatly, has practiced thrift experimentation cost greatly; And use flexibly, efficient is high.
The compound heat stabilization test device of aforesaid bushing high-voltage large current; It is characterized in that: described strong current generator is installed in the insulation fuel tank; Its input power supply winding is enclosed within on the strong current generator iron core column; The outside suit high-voltage insulation layer of power supply winding is divided into several with the oil clearance between big electric current winding and power supply winding and is consolidated by what small oil gap and insulation course constituted---liquid combined insulation layer.Its beneficial effect is: strengthened insulating between strong current generator input, the output winding; Solve the high-voltage insulation issue between the parts such as lead-out terminal, power input terminal and iron core; Make big electric current winding can tolerate the required trial voltage of sleeve pipe, thus the compound heat stabilization test that strengthens electric current when having realized that bushing adds high voltage.
The compound heat stabilization test method of bushing high-voltage large current; It is characterized in that: will bushing tested be installed on the fuel tank that is full of insulating oil; And be connected with another branch casing on the fuel tank; Constitute a closed-loop path so that connect the back with strong current generator, utilize electric heater unit insulating oil is heated to>=90 ℃; Adopt output current≤10A, output voltage required on request again; High-voltage generator in 1000 ~ 2400kV scope loads high voltage to described bushing, the output of high pressure generator HV Terminal and two parallelly connected, low-voltage terminal ground connection of bushing fuel tank outside conducting rod; Adopt capacity output voltage≤2kV, output current to choose by testing requirements simultaneously, the strong current generator within 200 ~ 10000A scope loads big electric current to bushing, and the strong current generator output terminal is connected with the inboard conducting rod of bushing fuel tank respectively; Inside and outside bushing and bushing inside and outside thermal field, electric field and the electromagnetic field of insulating medium all with bushing actual motion term harmonization, or reach the test determination requirement, the unit for electrical property parameters of being correlated with again test, heat stabilization test.Its beneficial effect is: adopt a low capacity high pressure generator and a low capacity strong current generator to give respectively and wait to test bushing loading high voltage and big electric current; Can realize traditional test that needs the high capacity power supply to accomplish, practice thrift experimentation cost greatly.
Description of drawings
Accompanying drawing 1 is the utility model embodiment circuit theory diagrams;
Accompanying drawing 2 is the compound heat stabilization test device of a utility model bushing high-voltage large current synoptic diagram.
Embodiment
Below in conjunction with accompanying drawing inventive embodiments is described further:
Shown in accompanying drawing 1 and accompanying drawing 2, the compound heat stabilization test device of the utility model bushing high-voltage large current comprises high-voltage generator T
1, strong current generator T
2, insulating oil heating arrangement 3 in insulation fuel tank 2, insulating oil 1 and the fuel tank, wait to test bushing SP
1, SP
2Be installed on the insulation fuel tank 2, insulating oil heating arrangement 3 is to utilize external power supply that insulating oil in the fuel tank 1 is heated to the electric heater unit of design temperature, and among the utility model embodiment, insulating oil oil temperature is 90 ℃, but also other tests are temperature required.
Among the utility model embodiment, high-voltage generator T
1Be the general output current≤10A of little electric current high voltage device, input end aS
1, bS
1Meet external power source S
1, output terminals A S
1Voltage can be by zero to adjustable continuously the equipment rated voltage, general output voltage≤2400kV exports HV Terminal AS
1With two bushing (SP
1, SP
2) the conducting rod parallel connection in the fuel tank outside, high pressure generator output low-voltage terminal F
1Ground connection; Strong current generator T
2Input end aS
2, bS
2Meet external power source S
2, T
2Be low-voltage and high-current device, generalized case T
2Output voltage≤2kV, output current can be by zero to adjustable continuously the equipment rated current, general output current≤10000A, its output terminals A S
2And BS
2Respectively with two bushing (SP that form series loop
1, SP
2) conducting rod connect.
In the work because strong current generator T
2Power input aS
2, bS
2Be place's low-voltage state, and big current output terminal AS
2, BS
2Because series connection inserts the output voltage terminal AS of high pressure generator
1, be in high-voltage state, special, AS
2, BS
2Voltage between terminals is also very low, therefore, must solve strong current generator T
2Lead-out terminal AS
2, BS
2With power supply terminal aS
2, bS
2With iron core F
2Between high-voltage insulation issue.Be through with T in the utility model
2Power supply input winding be placed in iron core column F
2On; Install insulation course additional in power supply input winding outside then; Can big electric current output winding and oil clearance between power supply input winding be divided into several is like this consolidated by what small oil gap and insulation course constituted---the liquid combined insulation, thus insulation is strengthened, make the input of big electric current, export winding high-tension effect can resistance test the time; Thereby realized that bushing loads the high-tension while, can load big electric current and carry out compound heat stabilization test.
Specific embodiment is used as follows:
Use the bushing than small dimension to be example with electric system, its parameter is that rated voltage is U
N=72.5kV, rated current I
NThe highest working voltage U of=1250A.
Max=126kV, as if the high voltage with routine, the mode of strong current transformer passes to rated current I
N, and apply the highest working voltage U
MaxThe time, then power supply capacity is S=U
Max* I
N=126 kV * 1250A=157500kVA. is obvious, and this experiment power supply capacity requirement is huge, and making an experiment like this is difficult to accept.
And when adopting the utility model to make an experiment, then the high pressure generator parameter used of test is: rated voltage 150kV rated current: 0.5A. strong current generator parameter is: rated voltage is U as the actual high voltage appearance generator output voltage that uses of 10V. rated current: 3000A.
1=126kV. output current I
1=0.15A. strong current generator output voltage U
2=6V, output current I
2=1250A, required power supply capacity S=S in the test
1+ S
2=126 * 0.15+6 * 1.250=26.4kVA.Adopt usual manner to be U
N=72.5kV I
NThe required power supply capacity of=1250A sleeve pipe is 5966 times that the utility model is accomplished same parameter sleeve pipe desired volume. economic benefit of visible the utility model and social benefit are very good.
Thermal stability test for bushing method for routine---promptly heat making alive and do not add when carrying out partial discharge test under the electric current condition; Test findings is: the partial discharge quantity at the 126kV sleeve pipe is 3pC, and the temperature rise value of sleeve pipe upper, middle and lower is 26.8K, 24.2K, 21.4K.And when adopting the utility model to carry out same test, under 126kV voltage, the partial discharge quantity of sleeve pipe is 9pC; Sleeve pipe upper, middle and lower temperature rise value is: 35.4k, 37.2k, 33.0k, and no matter the visible conventional method that adopts is that partial discharge test or sleeve pipe thermal field distribute, all loose than the utility model test method; Measure like the partial discharge test conventional method and to be 3pC, be qualified, and adopt the utility model test method; Then because of the heating of conducting rod, worsened insulation characterisitic, office high-volume reaches 9pC; Closed on defectively, and the sleeve pipe operating mode of the utility model is identical with actual motion, therefore; The thermal stability test for bushing method that can draw present routine is on the weak side, and operation result has also shown this point, and the utility model technology has just in time overcome this defective.
Claims (2)
1. the compound heat stabilization test device of bushing high-voltage large current; Comprise insulating oil heating arrangement in high-voltage generator, strong current generator, analogue transformer fuel tank and the fuel tank; Bushing to be tested is installed on the analogue transformer fuel tank, and the insulating oil heating arrangement is to utilize external power supply insulating oil in the fuel tank to be heated to>=90 ℃ electric heater unit; It is characterized in that: the electric current≤10A of described high-voltage generator, output voltage are chosen in 1000V ~ 2400kV scope by testing requirements, and its output HV Terminal is positioned at outside parallelly connected, the low-voltage terminal ground connection of conducting rod of fuel tank with two bushings; Output voltage≤the 2kV of described strong current generator, output current are chosen in 200 ~ 10000A scope by testing requirements, and its output terminal is positioned at fuel tank one end conducting rod with two bushings that form series loop respectively and is connected.
2. the compound heat stabilization test device of bushing high-voltage large current as claimed in claim 1; It is characterized in that: described strong current generator is installed in the insulation fuel tank; Its input power supply winding is enclosed within on the strong current generator iron core column; The outside suit high-voltage insulation layer of power supply winding is divided into several with the oil clearance between big electric current winding and power supply winding and is consolidated by what small oil gap and insulation course constituted---liquid combined insulation layer.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220150154 CN202600062U (en) | 2012-04-11 | 2012-04-11 | High-voltage large-current composite thermal stability test device for high-voltage bushing |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220150154 CN202600062U (en) | 2012-04-11 | 2012-04-11 | High-voltage large-current composite thermal stability test device for high-voltage bushing |
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| Publication Number | Publication Date |
|---|---|
| CN202600062U true CN202600062U (en) | 2012-12-12 |
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|---|---|---|---|
| CN 201220150154 Expired - Lifetime CN202600062U (en) | 2012-04-11 | 2012-04-11 | High-voltage large-current composite thermal stability test device for high-voltage bushing |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102645596A (en) * | 2012-04-11 | 2012-08-22 | 中国电力科学研究院 | High-voltage and high-current composite thermally stable test method and device for high-voltage casing pipe |
-
2012
- 2012-04-11 CN CN 201220150154 patent/CN202600062U/en not_active Expired - Lifetime
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102645596A (en) * | 2012-04-11 | 2012-08-22 | 中国电力科学研究院 | High-voltage and high-current composite thermally stable test method and device for high-voltage casing pipe |
| CN102645596B (en) * | 2012-04-11 | 2015-07-08 | 中国电力科学研究院 | High-voltage large-current composite thermal stability test method and device for high-voltage bushing |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| AV01 | Patent right actively abandoned |
Granted publication date: 20121212 Effective date of abandoning: 20150708 |
|
| RGAV | Abandon patent right to avoid regrant |