CN204269765U - A kind of transformer for power frequency withstand test and test unit - Google Patents

A kind of transformer for power frequency withstand test and test unit Download PDF

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Publication number
CN204269765U
CN204269765U CN201420717550.0U CN201420717550U CN204269765U CN 204269765 U CN204269765 U CN 204269765U CN 201420717550 U CN201420717550 U CN 201420717550U CN 204269765 U CN204269765 U CN 204269765U
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China
Prior art keywords
voltage
transformer
power frequency
frequency withstand
withstand test
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CN201420717550.0U
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Chinese (zh)
Inventor
姚成卓
何长顺
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武汉恒盛兴电力自动化有限公司
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Priority to CN201420717550.0U priority Critical patent/CN204269765U/en
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Abstract

The utility model relates to a kind of transformer and test unit, belongs to gas electrical test equipment field, is specifically related to a kind of transformer for power frequency withstand test and test unit.Wherein, transformer comprises: voltage equalizing ball, transformation assembly, connects the bushing of voltage equalizing ball and transformation assembly, is provided with connection high-voltage output line in bushing, and described high-voltage output line one end connects the high-voltage output end of transformation assembly, and the other end is positioned on voltage equalizing ball.Therefore, the utility model tool has the following advantages: (1) structure is simple, reduces the volume of equipment, weight and production cost, is convenient to onsite moving and combination installation, has higher dirigibility; (2) highly versatile: various high voltage electric equipment, electric elements, the dielectric(al) tests of insulating material under power frequency or high direct voltage such as electric system, industrial and mining enterprises, scientific research department can be adapted to.

Description

A kind of transformer for power frequency withstand test and test unit
Technical field
The utility model relates to a kind of transformer and test unit, belongs to gas electrical test equipment field, is specifically related to a kind of transformer for power frequency withstand test and test unit.
Background technology
Power frequency withstand test, namely applies power-frequency voltage to test specimen, with the insulation ability to bear checking test specimen to raise power-frequency voltage, is the most effective and the most direct test method of qualification test specimen dielectric strength.
Transformer is one of critical elements of power frequency withstand test.Under power frequency condition, because test specimen electric capacity is larger, or trial voltage requires higher, also have higher requirement accordingly to the power supply capacity of test unit, thus, often single-piece volume is large for the HT testing transformer in traditional industrial frequency withstand voltage device, Heavy Weight, thus make power frequency withstand test device be not easy to onsite moving, and be not easy to combination in any, dirigibility is poor.Further, existing HT testing transformer pressure range is limited, can not the frock experimental voltage demand of flexible Application under various scene.
Utility model content
It is large that the utility model mainly solves volume of transformer existing in prior art, and the technical matterss such as pressure range is little, provide a kind of transformer for power frequency withstand test and test unit.This transformer, by reasonably design, reduces the volume of equipment, weight and production cost, is convenient to onsite moving and combination installation, has higher dirigibility; And decrease leakage flux by coaxially arranged, increase the coupling between winding, thus expand pressure alteration scope, adopt the test unit of this transformer can be adapted to various high voltage electric equipment, electric elements, the dielectric(al) tests of insulating material under power frequency or high direct voltage such as electric system, industrial and mining enterprises, scientific research department.
Above-mentioned technical matters of the present utility model is mainly solved by following technical proposals:
For a transformer for power frequency withstand test, comprising: voltage equalizing ball, transformation assembly, connect the bushing of voltage equalizing ball and transformation assembly, be provided with high-voltage output line in bushing, described high-voltage output line one end connects the high-voltage output end of transformation assembly, and the other end is positioned on voltage equalizing ball.
Optimize, above-mentioned a kind of transformer for power frequency withstand test, is provided with the high voltage silicon rectifier stack be serially connected with on described high-voltage output line in described bushing.
Optimize, above-mentioned a kind of transformer for power frequency withstand test, is provided with for the moveable short-circuit rods by described high voltage silicon rectifier stack short circuit in described bushing.
Optimize, above-mentioned a kind of transformer for power frequency withstand test, described transformation package shell is provided with earth terminal.
Optimize, above-mentioned a kind of transformer for power frequency withstand test, described transformation assembly is oil immersed type transformation assembly, and it comprises: the fuel tank being filled with transformer oil in it, the transformation coil being positioned at fuel tank, wherein:
Described transformation coil comprises: iron core, be arranged on the secondary low pressure winding of iron core primary side, be arranged on the secondary high-pressure winding of iron core secondary side, and iron core primary side is also provided with measurement winding;
One end of described secondary high-pressure winding coil is connected with one end of high-voltage output line as the output terminal of transformation assembly, and the other end is connected with the high pressure tail of transformation assembly thus forms High voltage output loop;
The two ends of described low pressure winding coil press input end press input end to be connected with second time thus form low pressure input circuit respectively with the first time of transformation assembly;
The two ends of described measurement winding are connected with the second measurement terminal with the first measurement terminal of transformation assembly respectively thus form measuring circuit.
Optimize, above-mentioned a kind of transformer for power frequency withstand test, described fuel tank is also provided with fuel tap.
Optimize, above-mentioned a kind of transformer for power frequency withstand test, also comprise: current-limiting resistance R1, RC divider RCF, product to be tested place in circuit, wherein: high-voltage output line, current-limiting resistance R1, RC divider RCF connect successively after ground connection, described product to be tested place in circuit is in parallel with RC divider RCF.
Optimize, above-mentioned a kind of transformer for power frequency withstand test, described product to be tested place in circuit comprises: sphere gap G, sphere gap protective resistance RF, in parallel with product to be tested again after described sphere gap G connects with sphere gap protective resistance RF.
Optimize, above-mentioned a kind of transformer for power frequency withstand test, described product to be tested place in circuit comprises: high-voltage filtering capacitor C1, band protection microampere meter, and described band protection microampere meter is in parallel with high-voltage filtering capacitor C1 again after connecting with product to be tested.
Therefore, the utility model tool has the following advantages: (1) structure is simple: this reality is novel reduces the volume of equipment, weight and production cost by reasonably design, is convenient to onsite moving and combination installation, has higher dirigibility; (2) highly versatile: decrease leakage flux by coaxially arranged, increase the coupling between winding, thus expand pressure alteration scope, various high voltage electric equipment, electric elements, the dielectric(al) tests of insulating material under power frequency or high direct voltage such as electric system, industrial and mining enterprises, scientific research department can be adapted to.
Accompanying drawing explanation
Fig. 1 is the forward sight three-dimensional structure diagram of the utility model transformer.
Fig. 2 is the cut-open view of the utility model transformer.
Fig. 3 is the schematic diagram of the utility model transformer.
Fig. 4 is the schematic diagram of another transformer of the utility model.
Fig. 5 is the string group elementary diagram of the utility model transformer.
Fig. 6 is the utility model power frequency withstand test schematic diagram of device.
Fig. 7 is another power frequency withstand test schematic diagram of device of the utility model.
Embodiment
Below by embodiment, and by reference to the accompanying drawings, the technical solution of the utility model is described in further detail.In figure, short-circuit rods 1, voltage equalizing ball 2, bushing 3, transformer handle 4, fuel tap 5, second measurement terminal 9, first time press input end 6, second time pressure input end 7, first measurement terminal 8, second measurement terminal 9, earth terminal 10, high pressure tail 11, high-voltage output line 12, high voltage silicon rectifier stack 13, transformer oil 14, iron core 15, secondary low pressure winding 16, measurement winding 17, secondary high-pressure winding 18.
Embodiment 1:
See Fig. 1-2, a kind of transformer for power frequency withstand test, comprise: voltage equalizing ball 2, transformation assembly, connect the bushing 3 of voltage equalizing ball 2 and transformation assembly, be provided with high-voltage output line 12 in bushing 3, high-voltage output line 12 one end connects the high-voltage output end of transformation assembly, and the other end is positioned on voltage equalizing ball 2.
Transformation assembly is oil immersed type transformation assembly, as shown in Figure 2, it comprises: the fuel tank being filled with transformer oil 14 in it, the transformation coil being positioned at fuel tank, wherein: transformation coil comprises: iron core 15, be arranged on the secondary low pressure winding 16 of iron core 15 primary side, be arranged on the secondary high-pressure winding of iron core 15 secondary side, iron core 15 primary side is also provided with measures winding 17; One end of secondary high-pressure winding 18 coil is connected with one end of high-voltage output line 12 as the output terminal of transformation assembly, and the other end is connected with the high pressure tail 11 of transformation assembly; The two ends of secondary low pressure winding 16 coil press input end 6 to press input end 7 to be connected with second time respectively with the first time of transformation assembly; The two ends measuring winding 17 are connected with the second measurement terminal 9 with the first measurement terminal 8 of transformation assembly respectively, fuel tank are also provided with fuel tap 5 and earth terminal 10.
As shown in Figure 2, high voltage silicon rectifier stack 13 is set in bushing 3 and short-circuit rods 1 high voltage silicon rectifier stack 13 is serially connected with on high-voltage output line 12, can be used in high voltage silicon rectifier stack 13 short circuit after short-circuit rods 1 moves.
During transformer work, be 380V plant-grid connection with more than power frequency 220V10KVA, export first group of winding of transformer to through the outer attached 0-200V of being adjusted to of the above pressure regulator of automatic coupling voltage regulator 50KVA or 0-400V voltage, as shown in Figure 3.According to electromagnetic induction principle, the high voltage needed for test can be obtained at testing transformer high pressure winding.
As shown in Figure 4, high voltage silicon rectifier stack 13 is serially connected in high tension loop makes half-wave rectification, to obtain DC high voltage.When with a short-circuit rods 1 by high voltage silicon rectifier stack short circuit time, power frequency high voltage can be obtained, as interchange output state; When cancelling short-circuit rods 1, as direct current output state.
As shown in Figure 5, multiple stage transformer tandem can be obtained more high voltage.Tandem HT testing transformer has an enormous advantage, because whole test unit is made up of several separate unit testing transformers, separate unit test transform capacity is little, voltage is low, lightweight, is convenient to transport and installs.Since it can be concatenated into the separate unit testing transformer output voltage exceeding several times and combinationally use, a few cover separate unit testing transformer can be separated into again and be used alone.Package unit investment is little, economical and practical.A field copper is had in each single test transformer of the first order and the second level.In Figure 5, low-tension supply is added on the armature winding of testing transformer I, and field copper is powered to the armature winding of second level testing transformer II; The field copper of second level testing transformer II is powered to the armature winding of third level testing transformer III.The casing of second level testing transformer II and third level testing transformer III is in respectively over the ground on the noble potential of 1V and 2V, so casing is insulation over the ground, the casing of testing transformer I is ground connection.Such first order, the second level, the 3rd testing transformer rated output voltage are over the ground respectively 1V, 2V, 3V; Its rated capacity is respectively 3P, 2P, 1P.
As shown in Figure 6, be a kind of power frequency withstand test device comprising above-mentioned transformer of the present embodiment, adopt this device, can power frequency withstand test be carried out.High-voltage output line 12 connect successively with current-limiting resistance R1, RC divider RCF after ground connection, product to be tested place in circuit is in parallel with RC divider RCF.Wherein, product to be tested place in circuit comprises: sphere gap G, sphere gap protective resistance RF, and sphere gap G is in parallel with product to be tested again after connecting with sphere gap protective resistance RF.In power frequency withstand test, current-limiting resistance R1 should select according to the rated capacity of testing transformer.If high-pressure side output-current rating is when 100 – 300mA, desirable 0.5-1 Ω/V trial voltage; When high-pressure side output-current rating is more than 1A, desirable 1 Ω/V trial voltage.Conventional water resistance is as current-limiting resistance, and tube length can be considered by 150KV/m, and the thickness of pipe should have enough thermal capacity water resistance liquid making methods: add moderate amount of sulfuric acid copper with distilled water and be mixed with various different resistance.
Sphere gap and protective resistance: the 110%-120% sphere gap electric discharge of generally getting trial voltage when voltage exceedes sphere gap setting valve, plays a protective role to test specimen.Sphere gap protective resistance can be chosen by 1 Ω/V trial voltage.
In power frequency withstand test, low-pressure side measuring voltage instrument voltage is not very accurately, its reason is Lou cheated because testing transformer also exists, this last leakage reactance certainly exists pressure drop or holds and rise, make the voltage on test product below or above the voltage that low-pressure side measuring voltage table reflects.During power frequency withstand test, the voltage on test specimen, higher than the output voltage of testing transformer, namely rises phenomenon so-called appearance.During induced over voltage withstand test, the leakage reactance of testing transformer must also exist pressure drop.In order to the voltage that Measurement accuracy test specimen applies, high-pressure side access RCF RC divider of being therefore everlasting carrys out measuring voltage.
As shown in Figure 7, be a kind of power frequency withstand test device comprising above-mentioned transformer of the present embodiment, adopt this device, can high voltage direct current Leak Off Test (LOT) be carried out.It comprises: high-voltage output line 12, current-limiting resistance R1, RC divider RCF connect successively after ground connection, product to be tested place in circuit is in parallel with RC divider RCF.Wherein: product to be tested place in circuit comprises: high-voltage filtering capacitor C1, band protection microampere meter, band protection microampere meter is in parallel with high-voltage filtering capacitor C1 again after connecting with product to be tested.
When testing, should first extract short-circuit rods 1 out, reveal current-limiting resistance R1 in test and select when rated output voltage, output terminal short-circuit current is no more than the maximal integer mass flow electric current of high voltage silicon rectifier stack.For in the test unit of 60KV when maximal integer mass flow electric current as voltage silicon stack is 100mA, current-limiting resistance is pressed R1=60/0.1=600K Ω and is selected.Current-limiting resistance also should have enough capacity and creeping discharge distance.High press filtration stream electric capacity C1 is typically chosen in 0.01 – 0.1uF, and when the electric capacity of test specimen is very large, C1 can omit need not.
Specific embodiment described herein is only to the explanation for example of the utility model spirit.The utility model person of ordinary skill in the field can make various amendment or supplements or adopt similar mode to substitute to described specific embodiment, but can't depart from spirit of the present utility model or surmount the scope that appended claims defines.
Although more employ short-circuit rods 1, voltage equalizing ball 2, bushing 3, transformer handle 4, fuel tap 5, second measurement terminal 9 herein, first time press input end 6, second time presses input end 7, first measurement terminal 8, second measurement terminal 9, earth terminal 10, high pressure tail 11, high-voltage output line 12, high voltage silicon rectifier stack 13, transformer oil 14, iron core 15, secondary low pressure winding 16, term such as measurement winding 17, secondary high-pressure winding 18 etc., does not get rid of the possibility using other term.Using these terms, is to describe more easily and explaining essence of the present utility model; The restriction that they are construed to any one additional is all contrary with the utility model spirit.

Claims (9)

1. the transformer for power frequency withstand test, it is characterized in that, comprise: voltage equalizing ball (2), transformation assembly, connect the bushing (3) of voltage equalizing ball (2) and transformation assembly, be provided with high-voltage output line (12) in bushing (3), described high-voltage output line (12) one end connects the high-voltage output end of transformation assembly, and the other end is positioned on voltage equalizing ball (2).
2. a kind of transformer for power frequency withstand test according to claim 1, is characterized in that, is provided with the high voltage silicon rectifier stack (13) be serially connected with on described high-voltage output line (12) in described bushing (3).
3. a kind of transformer for power frequency withstand test according to claim 2, is characterized in that, is provided with for the moveable short-circuit rods (1) by described high voltage silicon rectifier stack (13) short circuit in described bushing (3).
4. a kind of transformer for power frequency withstand test according to claim 1, is characterized in that, described transformation package shell is provided with earth terminal (10).
5. a kind of transformer for power frequency withstand test according to claim 1, it is characterized in that, described transformation assembly is oil immersed type transformation assembly, and it comprises: the fuel tank being filled with transformer oil (14) in it, the transformation coil being positioned at fuel tank, wherein:
Described transformation coil comprises: iron core (15), be arranged on the secondary low pressure winding (16) of iron core (15) primary side, be arranged on the secondary high-pressure winding of iron core (15) secondary side, and iron core (15) primary side is also provided with measures winding (17);
One end of described secondary high-pressure winding (18) coil is connected with one end of high-voltage output line (12) as the output terminal of transformation assembly, and the other end is connected with the high pressure tail (11) of transformation assembly thus forms High voltage output loop;
The two ends of described low pressure winding (16) coil press input end (6) to press input end (7) be connected thus form low pressure input circuit with second time respectively with the first time of transformation assembly;
The two ends of described measurement winding (17) are connected with the second measurement terminal (9) with first measurement terminal (8) of transformation assembly respectively thus form measuring circuit.
6. a kind of transformer for power frequency withstand test according to claim 5, is characterized in that, described fuel tank is also provided with fuel tap (5).
7. a power frequency withstand test device, comprise transformer according to claim 1, it is characterized in that, also comprise: current-limiting resistance R1, RC divider RCF, product to be tested place in circuit, wherein: high-voltage output line (12), current-limiting resistance R1, RC divider RCF connect successively after ground connection, described product to be tested place in circuit is in parallel with RC divider RCF.
8. a kind of power frequency withstand test device according to claim 7, is characterized in that, described product to be tested place in circuit comprises: sphere gap G, sphere gap protective resistance RF, in parallel with product to be tested again after described sphere gap G connects with sphere gap protective resistance RF.
9. a kind of power frequency withstand test device according to claim 7, is characterized in that, described product to be tested place in circuit comprises: high-voltage filtering capacitor C1, band protection microampere meter, and described band protection microampere meter is in parallel with high-voltage filtering capacitor C1 again after connecting with product to be tested.
CN201420717550.0U 2014-11-26 2014-11-26 A kind of transformer for power frequency withstand test and test unit CN204269765U (en)

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Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105301459A (en) * 2015-11-24 2016-02-03 国网安徽省电力公司芜湖供电公司 High-voltage power-frequency AC voltage-withstanding system measuring platform
CN106298170A (en) * 2016-08-22 2017-01-04 沈国兴 A kind of high-tension transformer
CN106298208A (en) * 2015-06-11 2017-01-04 句容市江电电器机械有限公司 A kind of inflated type test potential device
CN106683859A (en) * 2017-02-10 2017-05-17 成都聚立汇信科技有限公司 Transmission transformer
CN108020760A (en) * 2017-11-02 2018-05-11 国网浙江省电力公司嘉兴供电公司 Industrial frequency withstand voltage testing equipment in one kind automation insulation seed oil
CN108461263A (en) * 2017-02-20 2018-08-28 武汉市欧睿科技有限公司 Light-duty inflatable power frequency testing transformer
CN110501593A (en) * 2019-08-29 2019-11-26 肖远奇 A kind of power equipment nigration detection vehicle device

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106298208A (en) * 2015-06-11 2017-01-04 句容市江电电器机械有限公司 A kind of inflated type test potential device
CN105301459A (en) * 2015-11-24 2016-02-03 国网安徽省电力公司芜湖供电公司 High-voltage power-frequency AC voltage-withstanding system measuring platform
CN105301459B (en) * 2015-11-24 2018-03-30 国网安徽省电力公司芜湖供电公司 High pressure industrial frequency AC pressurized system measuring table
CN106298170A (en) * 2016-08-22 2017-01-04 沈国兴 A kind of high-tension transformer
CN106683859A (en) * 2017-02-10 2017-05-17 成都聚立汇信科技有限公司 Transmission transformer
CN108461263A (en) * 2017-02-20 2018-08-28 武汉市欧睿科技有限公司 Light-duty inflatable power frequency testing transformer
CN108020760A (en) * 2017-11-02 2018-05-11 国网浙江省电力公司嘉兴供电公司 Industrial frequency withstand voltage testing equipment in one kind automation insulation seed oil
CN110501593A (en) * 2019-08-29 2019-11-26 肖远奇 A kind of power equipment nigration detection vehicle device

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Termination date: 20161126