CN109870598A - A kind of arrester Leakage Current test connection system and test method - Google Patents
A kind of arrester Leakage Current test connection system and test method Download PDFInfo
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- CN109870598A CN109870598A CN201910243506.8A CN201910243506A CN109870598A CN 109870598 A CN109870598 A CN 109870598A CN 201910243506 A CN201910243506 A CN 201910243506A CN 109870598 A CN109870598 A CN 109870598A
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- leakage current
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Abstract
The present invention provides a kind of arrester Leakage Current test connection system and test methods, belong to test of lightning arrester technical field, including two shielding cases, test through-hole, DC generator and test wire, two shielding case structures are respectively semicircle, cooperate with the periphery of the lower flange of arrester first segment, two shielding cases are surrounded by bolt is respectively equipped with threaded hole on the outside of lower flange, shielding part；Through-hole is tested to be set on a shielding part；Test wire core wire one end is connect by testing through-hole with lower flange, and the other end of core wire is connect through ammeter with DC generator 6；One end of shielding line is connect with a shielding part, and the other end of shielding line is directly connected to around ammeter with DC generator.Arrester Leakage Current test connection system provided by the invention, it is time saving and energy saving to test, and test result accuracy is high.
Description
Technical field
The invention belongs to test of lightning arrester technical fields, are that be related to 500kV and above lightning-arrest more specifically
During device error evaluation, direct current 1mA, voltage U are saved on arrester1mAAnd 0.75U1mALeakage Current test connection under voltage
System.
Background technique
Metal oxide arrester (MOA) have the characteristics that residual voltage it is low, without afterflow, time delay of action is small, discharge capacity is big, extensively
It is general to be applied to substation and power station, for protecting power equipment from the overvoltage injury such as being struck by lightning, operating.Currently, MOA has become
For overvoltage protection system most widely used in electric system.The superiority and inferiority of MOA performance is directly related to the person, equipment and power grid
Safety.To guarantee that MOA is functional, need periodically to carry out direct current 1mA, voltage U to MOA1mAAnd 0.75U1mALeakage electricity under voltage
Stream test, above two tests are required to apply higher test voltage from arrester flange.Voltage class is higher, arrester
Top grading ring volume is bigger, and the lower flange distance that grading ring saves on arrester is closer, tests upper section in pressure process and keeps away
Thunder device lower flange causes first segment arrester lower flange and presses to that can apply DC high voltage between grading ring under high pressure effect
Air ionization generates ionization current between ring.
It referring to Fig. 6, tests for routine test system arrester first segment Leakage Current, when arrester first segment is tested, leads to
It crosses high voltage direct current generator and applies voltage to the lower flange of first segment arrester, the electric current i1 for flowing through ammeter A1 reaches first segment
It is divided into two parts after the lower flange of arrester, a part is that i3 flows through arrester first segment upwards and then passes through ground connection,
Another part is to be grounded after i2 flows down through the second section, third section, Section of four arrester through ammeter A2.Theoretically (i1-i2)
Value be the Leakage Current ix for flowing through arrester first segment.It saves lower flange but during actual test, on arrester and presses
Distance is close between ring, voltage is high, and (direction is along grading ring radial direction to the ionization current i4 for causing air ionization between the two to generate
Outward), in turn resulting in the Leakage Current that arrester first segment flows through is ix=i1-i2-i4, and i4 size is unable to measure, and is caused
It can only be calculated according to ix=i1-i2 during actual measurement, cause voltage U under 1mA direct current leakage1mALess than normal and 0.75U1mAVoltage
Under Leakage Current it is less than normal, biggish error causes the erroneous judgement to arrester state.This erroneous judgement is due to 500kV and to power on
Press the test voltage U under grade arrester first segment 1mA direct current leakage electric current1mAAnd 0.75U1mALeakage Current test under voltage
In the process, distance is close between arrester first segment lower flange and grading ring, voltage is high, and air ionization between the two is caused to generate
Ionization current, in turn result in 1mA voltage U1mAAnd 0.75U1mALeakage Current error under voltage is huge, causes to arrester shape
The erroneous judgement of state.
And the interference elimination of this portion of electrical current can not be caused direct current 1mA, voltage U by routine test system1mAAnd 0.75U1mA
There is great deviation in Leakage Current test data under voltage.It generally requires to tear open arrester grading ring during routine test
It is tested after removing, off-test is restored.The dismounting of one group of 500kV arrester grading ring averagely needs 3 hours, affects
The duration of arrester checking experiment increases test of lightning arrester cost.
Currently, the modes such as mating shaping jig method, lifting device mounting method are widely used in test of lightning arrester wiring.It is mating at
Type fixture method uses the matched Special wiring fixture of test equipment, is clamped and is fixed in the specific position of tested device, but
Since 500kV and the above arrester are too high, lead to not using mating shaping jig method.Lifting device mounts method due to arrester
Flange arrangement is not quite similar, therefore often wastes many times when mounting test lead.
Summary of the invention
The purpose of the present invention is to provide a kind of arrester Leakage Current test connection systems, to solve to deposit in the prior art
Test method it is time-consuming and laborious, and Leakage Current test error is larger, and the technology judged by accident to arrester time of day is caused to ask
Topic.
To achieve the above object, the technical solution adopted by the present invention is that: a kind of arrester Leakage Current test connection is provided
System, comprising:
Two shielding cases are respectively provided with the company that structure is semicircular shielding part and extends along shielding part radial direction both ends
The periphery of socket part, the lower flange of the shielding part and the arrester first segment cooperates, two shielding cases by pass through
The bolt of the interconnecting piece of corresponding end surrounds the outside in the lower flange, respectively at least provided with a use on each shielding part
In the threaded hole fastened with the lower flange；
Through-hole is tested, is set on the shielding part, the core wire for test wire is connect with the lower flange；
DC generator is equipped with ammeter for detecting Leakage Current thereon；
Test wire, core wire one end are connect by the test through-hole with the lower flange, described in the other end warp of core wire
Ammeter is connect with the DC generator；One end of its shielding line is connect with a shielding part, the other end of shielding line
It is directly connected to around the ammeter and the DC generator.
Further, the system also includes:
Support rod is fixed on the outside of a shielding part and is arranged with the axial direction of the shielding case in angle, is used for
Support the test wire.
Further, the system also includes:
Pedestal is fixed on the outside of a shielding part, for fixing the support rod.
Further, the pedestal is equipped with threaded hole, and one end of the support rod is equipped with external screw thread, the support rod with
The whorl of base connection.
Further, the support rod extending radially outwardly along the shielding case, the other end are equipped with and are used to support institute
State the support slot of test wire.
Further, the support slot is resin material.
Further, the support rod is telescopic rod.
Further, the system also includes binding posts, are located therein on the shielding part, are used for joint test line
Shielding line.
Further, two threaded holes are respectively provided on each shielding part.
Further, two connecting holes are respectively provided on each interconnecting piece, are passed through for the bolt.
Another object of the present invention is to provide a kind of arrester Leakage Current test method, comprising:
Two shielding cases are surrounded to the outside for being fixed on arrester first segment lower flange with bolt；
Lock-screw passes through the threaded hole on shielding case, and the shielding case and the lower flange are locked；
Test wire is connected between DC generator and lower flange；
The bottom and top of arrester are grounded；
DC generator is opened, first segment direct current 1mA, voltage U are measured1mAAnd 0.75U1mALeakage Current under voltage.
The beneficial effect of arrester Leakage Current test connection system provided by the invention is: compared with prior art,
Arrester Leakage Current test connection system of the present invention is provided with shielding case outside lower flange, tests shielding case in boost process
There are high voltage between grading ring, air ionization has ionization current to flow through, due to there is shielding case between lower flange and grading ring
Presence, and shielding case and lower flange equipotential, therefore no-voltage between shielding case and lower flange, therefore at present by general measure
Flange masks the ionization current of air between grading ring, to ensure that the accuracy of measurement.
Detailed description of the invention
It to describe the technical solutions in the embodiments of the present invention more clearly, below will be to embodiment or description of the prior art
Needed in attached drawing be briefly described, it should be apparent that, the accompanying drawings in the following description is only of the invention some
Embodiment for those of ordinary skill in the art without creative efforts, can also be attached according to these
Figure obtains other attached drawings.
Fig. 1 is the structural representation of arrester Leakage Current test connection system test state provided in an embodiment of the present invention
Figure；
Fig. 2 is the structural schematic diagram of the arrester Leakage Current test connection system in Fig. 1 at B；
Fig. 3 is the overlooking structure diagram of Fig. 2；
Fig. 4 is one of the structural schematic diagram of shielding case shown in Fig. 2；
Fig. 5 is the second structural representation of shielding case shown in Fig. 2；
Fig. 6 is the structural schematic diagram of arrester first segment Leakage Current test connection system test state in the prior art.
Wherein, marked in the figure:
1- first segment；2- upper flange；3- grading ring；4- test wire；41- shielding line；42- core wire；5- ammeter；6- direct current
Generator；7- shielding case；71- shielding part；72- interconnecting piece；73- threaded hole；74- connecting hole；75- binding post；76- test is logical
Hole；8- support rod；9- pedestal；10- support slot；11- lower flange；The second section of 12-；13- third section.
Specific embodiment
In order to which technical problems, technical solutions and advantages to be solved are more clearly understood, tie below
Accompanying drawings and embodiments are closed, the present invention will be described in further detail.It should be appreciated that specific embodiment described herein is only
To explain the present invention, it is not intended to limit the present invention.
Also referring to Fig. 1 to Fig. 5, now arrester Leakage Current test connection system provided by the invention is said
It is bright.The arrester Leakage Current test connection system, including two shielding cases 7, test through-hole 76, DC generator 6 and examination
Line 4 is tested, two shielding cases 7 are respectively provided with structure and are semicircular shielding part 71 and extend along the radial both ends of the shielding part 71
The periphery of interconnecting piece 72, the shielding part 71 and the lower flange 11 of the arrester first segment 1 cooperates, two shielding cases
7 surround the outside in the lower flange 11 by pass through the bolt of the interconnecting piece 72 of corresponding end, on each shielding part 71 point
Not at least provided with a threaded hole 73 for being fastened with the lower flange 11；It tests through-hole 76 and is set to a shielding part 71
On, the core wire 42 for test wire 4 is connect with the lower flange 11；DC generator 6 is installed thereon for detecting Leakage Current
There is ammeter 5；Its 42 one end of core wire of test wire 4 is connect by the test through-hole 76 with the lower flange 11, core wire 42 it is another
One end is connect through the ammeter 5 with the DC generator 6；One end of its shielding line 41 connects with a shielding part 71
It connects, the other end of shielding line 41 is directly connected to around the ammeter 5 with the DC generator 6.
Arrester Leakage Current test connection system provided by the invention, compared with prior art, in 11 peripheral hardware of lower flange
Shielding case 7 is set, shielding case 7 is coated on the outer circumference surface of lower flange 11, tests shielding case 7 and grading ring 3 in boost process
Between there are high voltage, air ionization has ionization current to flow through, due to there is depositing for shielding case 7 between lower flange 11 and grading ring 3
, and shielding case 7 and 11 equipotential of lower flange, therefore no-voltage between shielding case 7 and lower flange 11, therefore when by general measure
Lower flange 11 masks the ionization current of air between grading ring 3, to ensure that the accuracy of measurement.System structure letter
It is single, it is easy to make, test is convenient.
A kind of tool also referring to Fig. 1 to Fig. 3, as arrester Leakage Current test connection system provided by the invention
Body embodiment, the system also includes the support rod 8 for the outside for being fixed on a shielding part 71, support rod 8 with it is described
The axial direction of shielding case 7 is arranged in angle, is used to support the test wire 4.Support rod 8 is protruding, plays support to test wire 4
Effect.The axial angle of support rod 8 and shielding case 7 can be between 45 ° to 100 °, to can avoid test wire 4 directly along keeping away
Thunder device upwardly extends, and makes to maintain a certain distance between test wire 4 and arrester.
Fig. 2 to Fig. 3 is please referred to, a kind of specific reality as arrester Leakage Current test connection system provided by the invention
Mode is applied, the system also includes pedestals 9, the outside of a shielding part 71 are fixed on, for fixing the support rod 8.
Support rod 8 is mounted on pedestal 9, and 9 detachable connection of pedestal or is fixedly connected, the on the one hand production of bar 8 easy to support,
The connection of bar 8 and shielding case 7 easy to support.
Optionally, a kind of specific embodiment as arrester Leakage Current test connection system provided by the invention,
Pedestal 9 is equipped with threaded hole 73, and one end of the support rod 8 is equipped with external screw thread, and the support rod 8 connects with 9 screw thread of pedestal
It connects.Support rod 8 is threadedly coupled with pedestal 9, easy to disassemble, when not in use, can be removed support rod 8, facilitate storage, carry and
Transhipment.
Fig. 2 to Fig. 3 is please referred to, a kind of specific reality as arrester Leakage Current test connection system provided by the invention
Mode is applied, support rod 8 extends radially outwardly along the shielding case 7, and the other end is equipped with the branch for being used to support the test wire 4
Support slot 10.Test wire 4 support rod 8 pedestal 9 vertical with shielding case 7, the test of resin material are welded on shielding case 71 simultaneously
4 support rod 8 of line is riveted on pedestal 9, and the support slot 10 of 4 support rod of test wire, 8 end is U-type groove, for supporting test screen
Cover line 41.Support rod 8 is axially vertical with shielding case 7, namely is when in use horizontality, and the notch of U-type groove is outside, and two
A symmetrical two cell walls are horizontality, and test wire 4 is close with shielding case 7 after support rod 8 again at support slot 10, then
Connection.Wherein, one or two support rings or support slot 10 can also be set along support rod 8, for laying test wire 4, prevents from trying
Test the shaking of line 4.
Please refer to figs. 2 and 3, a kind of specific reality as arrester Leakage Current test connection system provided by the invention
Mode is applied, support slot 10 is resin material, plays insulating effect.
A kind of specific implementation refering to Fig. 2 and Fig. 3, as arrester Leakage Current test connection system provided by the invention
Mode, support rod 8 be telescopic rod, for adjusting the distance between test wire 4 and shading ring, during guarantee test safely away from
From.Telescopic rod is the prior art used, is no longer described herein.In test, between adjustable test wire 4 and arrester
Distance, during avoiding Leakage Current from testing, distance is close, voltage is high between 1 lower flange 11 of arrester first segment and grading ring 3 is made
1mA voltage U is in turn resulted at the ionization current that air ionization between the two generates1mAAnd 0.75U1mALeakage Current under voltage
The huge erroneous judgement caused to arrester state of error.
Fig. 2 to Fig. 5 is please referred to, a kind of specific reality as arrester Leakage Current test connection system provided by the invention
Mode is applied, further includes binding post 75, is located therein on the shielding part 71, the shielding line 41 for joint test line 4.
Fig. 4 and Fig. 5 is please referred to, a kind of specific reality as arrester Leakage Current test connection system provided by the invention
Mode is applied, two threaded holes 73 are respectively provided on each shielding part 71.By screw, by shielding case 7 and lower flange
11 lockings, are arranged two threaded holes 73, the reliability of connection can be improved.
Fig. 2 to Fig. 5 is please referred to, a kind of specific reality as arrester Leakage Current test connection system provided by the invention
Mode is applied, two connecting holes 74 is respectively provided on each interconnecting piece 72, is passed through for the bolt.
Referring to Fig. 1, utilizing above-mentioned test connection system the present invention also provides a kind of arrester Leakage Current test method
System is tested, and test procedure includes:
Two shielding cases 7 are surrounded to the outside for being fixed on 1 lower flange 11 of arrester first segment with bolt；
Lock-screw passes through the threaded hole 73 on shielding case 7, and the shielding case 7 and the lower flange 11 are locked；
Test wire 4 is connected between DC generator 6 and lower flange 11；
The bottom and top of arrester are grounded；
DC generator 6 is opened, 1 direct current 1mA of first segment, voltage U are measured1mAAnd 0.75U1mALeakage Current under voltage.
Telescopic rod is elongated or shortening is using telescopic support rod if you need to the distance for adjusting test wire to arrester
Can, test is convenient.
It can be by lower flange 11 when general measure to air between grading ring 3 due to shielding case using the test method
Ionization current masks, and electric current will not be flowed up along first segment, will not be along grading ring Radial Flow, therefore, the value of i1-i2
To flow through the Leakage Current ix of arrester first segment, to ensure that the accuracy of measurement, erroneous judgement is reduced, guarantees Electrical Safety.
And it is easy to operate, it is time saving and energy saving.
The foregoing is merely illustrative of the preferred embodiments of the present invention, is not intended to limit the invention, all in essence of the invention
Made any modifications, equivalent replacements, and improvements etc., should all be included in the protection scope of the present invention within mind and principle.
Claims (11)
1. a kind of arrester Leakage Current test connection system characterized by comprising
Two shielding cases are respectively provided with the connection that structure is semicircular shielding part and extends along shielding part radial direction both ends
The periphery of the lower flange of portion, the shielding part and the arrester first segment cooperates, and two shielding cases are by pass through right
The bolt for the interconnecting piece that should be held surrounds the outside in the lower flange, is used for respectively at least provided with one on each shielding part
With the threaded hole of lower flange fastening；
Through-hole is tested, is set on the shielding part, the core wire for test wire is connect with the lower flange；
DC generator is equipped with ammeter for detecting Leakage Current thereon；
Test wire, core wire one end are connect by the test through-hole with the lower flange, and the other end of core wire is through the electric current
Table is connect with the DC generator；One end of its shielding line is connect with a shielding part, and the other end of shielding line bypasses
The ammeter is directly connected to the DC generator.
2. a kind of arrester Leakage Current test connection system as described in claim 1, which is characterized in that the system is also wrapped
It includes:
Support rod is fixed on the outside of a shielding part and is arranged with the axial direction of the shielding case in angle, is used to support
The test wire.
3. a kind of arrester Leakage Current test connection system as claimed in claim 2, which is characterized in that the system is also wrapped
It includes:
Pedestal is fixed on the outside of a shielding part, for fixing the support rod.
4. a kind of arrester Leakage Current test connection system as claimed in claim 3, which is characterized in that set on the pedestal
There is threaded hole, one end of the support rod is equipped with external screw thread, and the support rod is connect with the whorl of base.
5. a kind of arrester Leakage Current test connection system as claimed in claim 2, which is characterized in that the support rod edge
The shielding case extends radially outwardly, and the other end is equipped with the support slot for being used to support the test wire.
6. a kind of arrester Leakage Current test connection system as claimed in claim 5, which is characterized in that the support slot is
Resin material.
7. a kind of arrester Leakage Current test connection system as claimed in claim 2, which is characterized in that the support rod is
Telescopic rod.
8. a kind of arrester Leakage Current test connection system as described in claim 1, it is characterised in that: the system is also wrapped
Binding post is included, is located therein on the shielding part, the shielding line for joint test line.
9. a kind of arrester Leakage Current test connection system as described in claim 1, which is characterized in that each shielding
Two threaded holes are respectively provided in portion.
10. a kind of arrester Leakage Current test connection system as described in claim 1, which is characterized in that each company
It is respectively provided with two connecting holes in socket part, is passed through for the bolt.
11. such as the described in any item arrester Leakage Current test methods of claim 1-10 characterized by comprising
Two shielding cases are surrounded to the outside for being fixed on arrester first segment lower flange with bolt；
Lock-screw passes through the threaded hole on shielding case, and the shielding case and the lower flange are locked；
Test wire is connected between DC generator and lower flange；
The bottom and top of arrester are grounded；
DC generator is opened, first segment direct current 1mA, voltage U are measured1mAAnd 0.75U1mALeakage Current under voltage.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910243506.8A CN109870598A (en) | 2019-03-28 | 2019-03-28 | A kind of arrester Leakage Current test connection system and test method |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910243506.8A CN109870598A (en) | 2019-03-28 | 2019-03-28 | A kind of arrester Leakage Current test connection system and test method |
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| CN111257604A (en) * | 2020-04-09 | 2020-06-09 | 国家电网有限公司 | Upper section test wiring device for 500kV and above voltage level lightning arrester |
| CN111521847A (en) * | 2020-05-20 | 2020-08-11 | 国家电网有限公司 | Lightning arrester direct current test wiring converter |
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| CN111521847A (en) * | 2020-05-20 | 2020-08-11 | 国家电网有限公司 | Lightning arrester direct current test wiring converter |
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