CN206892261U - Alternating current withstand voltage test device for overhead line - Google Patents
Alternating current withstand voltage test device for overhead line Download PDFInfo
- Publication number
- CN206892261U CN206892261U CN201720903189.4U CN201720903189U CN206892261U CN 206892261 U CN206892261 U CN 206892261U CN 201720903189 U CN201720903189 U CN 201720903189U CN 206892261 U CN206892261 U CN 206892261U
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- frequency power
- alternating current
- test device
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- 238000012360 testing method Methods 0.000 title claims abstract description 58
- 230000005284 excitation Effects 0.000 claims abstract description 5
- 230000005540 biological transmission Effects 0.000 claims description 18
- 230000009466 transformation Effects 0.000 claims description 4
- 238000009413 insulation Methods 0.000 abstract description 4
- 230000007547 defect Effects 0.000 abstract description 3
- 238000009774 resonance method Methods 0.000 abstract 1
- 238000002474 experimental method Methods 0.000 description 6
- 230000008859 change Effects 0.000 description 5
- 230000005611 electricity Effects 0.000 description 4
- 230000006698 induction Effects 0.000 description 3
- 230000008439 repair process Effects 0.000 description 3
- 230000033228 biological regulation Effects 0.000 description 2
- 238000012423 maintenance Methods 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 230000001629 suppression Effects 0.000 description 2
- 230000015556 catabolic process Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000000835 fiber Substances 0.000 description 1
- 238000002955 isolation Methods 0.000 description 1
- 230000007935 neutral effect Effects 0.000 description 1
- 238000004382 potting Methods 0.000 description 1
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Abstract
The utility model discloses an exchange withstand voltage test device for overhead line, include: the device comprises a variable frequency power supply, an excitation transformer, a resonance reactor, an alternating current contactor and a test interface; the input end of the variable frequency power supply is connected with external alternating current, and the output end of the variable frequency power supply is connected with a primary coil of the excitation transformer; one end of the resonance reactor is connected with one end of a secondary coil of the excitation transformer through the alternating current contactor, and the other end of the resonance reactor is connected with the test interface; the other end of the secondary coil of the exciting transformer is grounded; the test interface is used for being connected with one end of a cable to be tested of the overhead line, and the other end of the cable to be tested is grounded. The device does not need to remove the overhead line when carrying out the alternating current withstand voltage test, carries out the alternating current withstand voltage test to cable and overhead line through series resonance method, can be better the discovery whole line's insulation defect to the intensity of labour and the work danger of maintainer have been reduced.
Description
Technical field
Pressure test technical field is the utility model is related to, more particularly to a kind of ac voltage withstanding for overhead transmission line is tested
Device.
Background technology
Existing 35kV isolated neutral systems have installed arc suppression coil, and have arc suppression coil to automatically control input regulation
System, but the overvoltage such as thunder and lightning, operation still causes very big harm to 35kV systems, triggers a lot of ground connection, so as to cause
Cable breakdown failure.
After substation equipment maintenance and repair is to failure cable repair process, when carrying out high-potting, due to conventional methods, experiment
Instrument capacity can not meet condition, therefore need to release overhead transmission line, this not only adds the working strength of substation equipment maintenance and repair personnel,
Also the danger of work is materially increased, and can not further investigate the insulation hidden danger of whole piece circuit.
The information for being disclosed in the background section is merely intended to increase the understanding to general background of the present utility model, and
It is not construed as recognizing or implies that the information structure has been existing well known to persons skilled in the art in any form
Technology.
Utility model content
The purpose of this utility model is to provide a kind of alternating-current voltage resistance test device for overhead transmission line, existing so as to overcome
Have and the big technical problem of ac voltage withstanding experiment work amount is carried out to overhead transmission line.
To achieve the above object, the utility model provides a kind of alternating-current voltage resistance test device for overhead transmission line, bag
Include:Variable-frequency power sources, exciting transformer, resonance reactor, A.C. contactor and test interface;The input of the variable-frequency power sources with
Outside exchange is electrically connected, and the output end of the variable-frequency power sources is connected with the primary coil of the exciting transformer;The resonance
One end of reactor is connected by the A.C. contactor with one end of the secondary coil of the exciting transformer, the resonance electricity
The other end of anti-device is connected with the test interface;The other end ground connection of the secondary coil of the exciting transformer;The test
Interface is used to be connected with one end of the cable under test of overhead transmission line, and the other end ground connection of the cable under test.
In a kind of possible implementation, the alternating-current voltage resistance test device also includes:High-voltage bleeder;The high pressure point
One end of depressor is connected with the test interface, other end ground connection.
In a kind of possible implementation, the high-voltage bleeder is purely capacitive formula divider.
In a kind of possible implementation, the alternating-current voltage resistance test device also includes:High pressure compensation electric capacity;The high pressure
One end of compensating electric capacity is connected with the test interface, other end ground connection.
In a kind of possible implementation, the input of the variable-frequency power sources is used for the alternating current for receiving 50Hz, and institute
The voltage for stating alternating current is 220V or 380V.
Compared with prior art, the utility model has the advantages that:
A kind of alternating-current voltage resistance test device for overhead transmission line that the utility model embodiment provides, it is resistance to exchange
Overhead transmission line need not be released during pressure experiment, ac voltage withstanding experiment is carried out together with overhead transmission line to cable by series resonant method,
The insulation defect of whole piece circuit can be preferably found, and reduce the labor intensity and work risk of maintainer;Simultaneously
Equipment is simple, it is not necessary to directly provides high pressure, test is simple.
Other features and advantages of the utility model will illustrate in the following description, also, partly from specification
In become apparent, or understood by implementing the utility model.The purpose of this utility model and other advantages can pass through
Specifically noted structure is realized and obtained in the specification, claims and accompanying drawing write.
Below by drawings and examples, the technical solution of the utility model is described in further detail.
Brief description of the drawings
Accompanying drawing is used for providing further understanding to of the present utility model, and a part for constitution instruction, with this practicality
New embodiment is used to explain the utility model together, does not form to limitation of the present utility model.In the accompanying drawings:
Fig. 1 is the first circuit structure diagram of alternating-current voltage resistance test device in the utility model embodiment;
Fig. 2 is the second circuit structure chart of alternating-current voltage resistance test device in the utility model embodiment.
Embodiment
Below in conjunction with the accompanying drawings, specific embodiment of the present utility model is described in detail, it is to be understood that this practicality
New protection domain is not limited by embodiment.
Explicitly indicated that unless otherwise other, otherwise in entire disclosure and claims, term " comprising " or its change
Change such as "comprising" or " including " etc. and will be understood to comprise stated element or part, and do not exclude other members
Part or other parts.
A kind of alternating-current voltage resistance test device for overhead transmission line disclosed in the utility model embodiment, it is shown in Figure 1,
Including:Variable-frequency power sources, exciting transformer T, resonance reactor L, A.C. contactor K and test interface A.
Wherein, the input of variable-frequency power sources is electrically connected with exchanging for outside, output end and the exciting transformer T of variable-frequency power sources
Primary coil be connected.In the utility model embodiment, variable-frequency power sources is used to realize 50Hz power frequencies → direct current → frequency-changing AC
The conversion of electricity, the adjustable alternating current of output frequency.Specifically, the input power of variable-frequency power sources can be civil power or commercial power,
Frequency is 50Hz, it is allowed to which error is ± 5%;Magnitude of voltage is 220V/380V, it is allowed to which error is ± 10%;Output voltage values are adjustable,
0~200V/400V is generally exchanged, the scope of output frequency is 20~400Hz.
As shown in figure 1, resonance reactor L one end pass through A.C. contactor K and exciting transformer T secondary coil one
End is connected, and the resonance reactor L other end is connected with test interface A;The other end ground connection of exciting transformer T secondary coil.
In the utility model embodiment, the inductance to be measured of resonance reactor L and capacitive is composed in series resonant tank, resonance electricity
Anti- device L is the adjustable inductance of induction reactance, reaches resonant condition by the induction reactance loop for adjusting resonance reactor L.Excitation transformation
Device is used to be isolated variable-frequency power sources with transformation test loop, to protect variable-frequency power sources;Play a part of transformation matching simultaneously,
The power and voltage at utmost accomplishing variable-frequency power sources and cable under test match.A.C. contactor K is used to control resonant tank
Break-make, can occur it is unexpected when quickly disconnect resonant tank.
Test interface A is used to be connected with the cable under test X of overhead transmission line one end, and cable under test X other end ground connection.
In the utility model embodiment, quickly it can be connected by test interface A with cable under test, so as to improve testing efficiency.
The operation principle for the alternating-current voltage resistance test device that the utility model embodiment provides is specific as follows:For series resonance
Circuit, when the sinusoidal frequency of resonance circuit external input voltage reaches a certain specific frequency (i.e. the resonant frequency of the circuit),
The induction reactance of resonance circuit is equal with capacitive reactance, i.e.,:So resonance angular frequencyAgain due to the π f of ω=20, therefore
Resonant frequencyWherein, L represents the inductance value of resonance reactor, and C represents the capacitance of capacitive cable under test.
Meanwhile when resonant tank produces series resonance, Us=QU0,Wherein, the quality factor of resonant tank areR is the resistance value of resonant tank, and the resistance is specifically by the exciting transformer in loop, electricity to be measured
The internal resistance composition of cable;UsRepresent the voltage of cable under test both sides, U0Represent the output voltage of exciting transformer secondary coil, PsTable
Show the power of cable under test, P0Represent the power of exciting transformer secondary coil output.
Because the frequency of resonance circuit can change in the range of 20~400Hz, resonant frequency excursion is larger, quality because
Number Q excursion is larger, typically between tens to hundreds of.It can be seen from above-mentioned analysis, due to Us=QU0、I.e.
Pass through a less magnitude of voltage U0Can be to provide higher voltage U for cable under tests.For example the cable of overhead transmission line is entered
When row 52KV ac voltage withstandings are tested, if Q is 100, exciting transformer exports 520V voltage.
A kind of alternating-current voltage resistance test device for overhead transmission line that the utility model embodiment provides, it is resistance to exchange
Overhead transmission line need not be released during pressure experiment, ac voltage withstanding experiment is carried out together with overhead transmission line to cable by series resonant method,
The insulation defect of whole piece circuit can be preferably found, and reduce the labor intensity and work risk of maintainer;Simultaneously
Equipment is simple, it is not necessary to directly provides high pressure, test is simple.
Shown in Figure 2 on the basis of above-described embodiment, the device also includes:High-voltage bleeder S;High-voltage bleeder S
One end be connected with test interface A, the other end ground connection.High-voltage bleeder is used for the test voltage for measuring cable under test X, using string
Purely capacitive formula divider can be typically used when joining resonance, the voltage detected by direct coupled type or the output of Fiber isolation formula.
Shown in Figure 2 on the basis of above-described embodiment, the device also includes:High pressure compensation electric capacity C1;High pressure compensation
Electric capacity C1 one end is connected with test interface A, other end ground connection.The high pressure compensation electric capacity main function is compensation short distance, small
The power cables capacitance amount of equivalent electric capacity (below thousands of pico farads), by being connected in parallel to the intrinsic humorous of in resonant tank so that loop
Vibration frequency is in the frequency range that variable-frequency power sources or regulation require.
The foregoing description to specific illustrative embodiment of the present utility model is to illustrate and the purpose of illustration.These
Description is not wishing to for the utility model to be defined to disclosed precise forms, and it will be apparent that according to above-mentioned teaching, can carry out
It is many to change and change.The purpose of selecting and describing the exemplary embodiment is that explain certain principles of the present utility model
And its practical application, so that those skilled in the art can realize and utilize a variety of examples of the present utility model
Property embodiment and various chooses and changes.The scope of the utility model is intended to by claims and its waits similar shape
Formula is limited.
Claims (5)
- A kind of 1. alternating-current voltage resistance test device for overhead transmission line, it is characterised in that including:Variable-frequency power sources, exciting transformer, Resonance reactor, A.C. contactor and test interface;The input of the variable-frequency power sources is electrically connected with exchanging for outside, the output end of the variable-frequency power sources and the excitation transformation The primary coil of device is connected;One end phase that one end of the resonance reactor passes through the A.C. contactor and the secondary coil of the exciting transformer Even, the other end of the resonance reactor is connected with the test interface;The other end of the secondary coil of the exciting transformer Ground connection;The test interface is used to be connected with one end of the cable under test of overhead transmission line, and another termination of the cable under test Ground.
- 2. alternating-current voltage resistance test device according to claim 1, it is characterised in that also include:High-voltage bleeder;The height One end of pressure divider is connected with the test interface, other end ground connection.
- 3. alternating-current voltage resistance test device according to claim 2, it is characterised in that the high-voltage bleeder is purely capacitive formula Divider.
- 4. alternating-current voltage resistance test device according to claim 1, it is characterised in that also include:High pressure compensation electric capacity;One end of the high pressure compensation electric capacity is connected with the test interface, other end ground connection.
- 5. alternating-current voltage resistance test device according to claim 1, it is characterised in that the input of the variable-frequency power sources is used for 50Hz alternating current is received, and the voltage of the alternating current is 220V or 380V.
Priority Applications (1)
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CN201720903189.4U CN206892261U (en) | 2017-07-24 | 2017-07-24 | Alternating current withstand voltage test device for overhead line |
Applications Claiming Priority (1)
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CN201720903189.4U CN206892261U (en) | 2017-07-24 | 2017-07-24 | Alternating current withstand voltage test device for overhead line |
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CN201720903189.4U Expired - Fee Related CN206892261U (en) | 2017-07-24 | 2017-07-24 | Alternating current withstand voltage test device for overhead line |
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Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN110389271A (en) * | 2019-08-14 | 2019-10-29 | 青岛云路特变智能科技有限公司 | Testing System of Transformer and method |
CN112540276A (en) * | 2020-12-07 | 2021-03-23 | 广东电网有限责任公司 | Vehicle-mounted cable voltage withstand test device and test system |
-
2017
- 2017-07-24 CN CN201720903189.4U patent/CN206892261U/en not_active Expired - Fee Related
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN110389271A (en) * | 2019-08-14 | 2019-10-29 | 青岛云路特变智能科技有限公司 | Testing System of Transformer and method |
CN112540276A (en) * | 2020-12-07 | 2021-03-23 | 广东电网有限责任公司 | Vehicle-mounted cable voltage withstand test device and test system |
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Granted publication date: 20180116 |