CN206818820U - Test circuit of metal oxide arrester - Google Patents
Test circuit of metal oxide arrester Download PDFInfo
- Publication number
- CN206818820U CN206818820U CN201720762510.1U CN201720762510U CN206818820U CN 206818820 U CN206818820 U CN 206818820U CN 201720762510 U CN201720762510 U CN 201720762510U CN 206818820 U CN206818820 U CN 206818820U
- Authority
- CN
- China
- Prior art keywords
- voltage generator
- arrester
- test circuit
- direct
- filter capacitor
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
- 229910044991 metal oxide Inorganic materials 0.000 title claims abstract description 18
- 150000004706 metal oxides Chemical class 0.000 title claims abstract description 18
- 239000003990 capacitor Substances 0.000 claims abstract description 15
- XLOMVQKBTHCTTD-UHFFFAOYSA-N Zinc monoxide Chemical group [Zn]=O XLOMVQKBTHCTTD-UHFFFAOYSA-N 0.000 claims description 6
- 230000001681 protective effect Effects 0.000 claims description 6
- 238000009413 insulation Methods 0.000 claims description 5
- 239000000758 substrate Substances 0.000 claims description 3
- 229960001296 zinc oxide Drugs 0.000 claims description 3
- 239000011787 zinc oxide Substances 0.000 claims description 3
- 230000005684 electric field Effects 0.000 abstract 1
- 238000005259 measurement Methods 0.000 description 13
- 238000005421 electrostatic potential Methods 0.000 description 5
- 230000005611 electricity Effects 0.000 description 2
- 230000003449 preventive effect Effects 0.000 description 2
- 241000208340 Araliaceae Species 0.000 description 1
- 235000005035 Panax pseudoginseng ssp. pseudoginseng Nutrition 0.000 description 1
- 235000003140 Panax quinquefolius Nutrition 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 235000013399 edible fruits Nutrition 0.000 description 1
- 235000008434 ginseng Nutrition 0.000 description 1
- 239000012212 insulator Substances 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- APTZNLHMIGJTEW-UHFFFAOYSA-N pyraflufen-ethyl Chemical compound C1=C(Cl)C(OCC(=O)OCC)=CC(C=2C(=C(OC(F)F)N(C)N=2)Cl)=C1F APTZNLHMIGJTEW-UHFFFAOYSA-N 0.000 description 1
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- Emergency Protection Circuit Devices (AREA)
Abstract
The utility model discloses a test circuit of metal oxide arrester, include: the lightning arrester comprises a direct current voltage generator, a filter capacitor, an electrostatic voltmeter, a direct current microampere meter and a lightning arrester; the filter capacitor is connected with the direct-current voltage generator in parallel, and the electrostatic voltmeter is connected with the direct-current voltage generator in parallel; one end of the lightning arrester is connected with one end of the direct-current voltage generator, and the other end of the lightning arrester is connected with the other end of the direct-current voltage generator through the direct-current microammeter; the direct current voltage generator, the filter capacitor, the electrostatic voltmeter, the direct current microampere meter and the lightning arrester are connected through double shielding wires. The test circuit sets the connecting wire into a double-shielded wire, thereby effectively shielding stray current under strong electric field intensity and enabling the measured leakage current to be closer to a true value.
Description
Technical field
It the utility model is related to arrester checks technical field, the test electricity of more particularly to a kind of metal oxide arrester
Road.
Background technology
Arrester is a kind of overvoltage protection, when line voltage rise reaches operation voltage as defined in arrester,
Lightning arrestor movement, overvoltage load is discharged, the elevated amplitude of line voltage is limited under certain level, so as to protection equipment
Insulate without damage.Arrester also not is avoided being struck by lightning, but overvoltage caused by thunderbolt is restricted into insulator arrangement to hold
The level received.
The preventive trial project of metal oxide arrester includes measurement insulaion resistance and measured critical under direct current 1mA
Leakage Current under voltage and 75% critical voltage.Whether the measurement of insulaion resistance can be tentatively understood inside it makes moist, in time
It was found that defect.The measurement of critical voltage under direct current 1mA, mainly checks whether its valve block makes moist；Under 75% critical voltage
The measurement of Leakage Current mainly detects whether long-term permission operating current meets regulation.
Existing power plant's main transformer high-pressure side uses 500KV metal oxide arresters (MOA), its insulaion resistance when in measurement
It can reach more than 100000M Ω, can tentatively judge not make moist inside arrester.But kept away measuring normal metal oxide
During thunder device, during Leakage Current under the critical voltage and 75% critical voltage under measuring its 1mA, per critical between mutually often saving
Magnitude of voltage does not have certain rule, when it is big when it is small, leakage current is all more than 100 μ A, or even the middle section leakage current of arrester
It can reach 300 μ A or so.
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 test circuit of metal oxide arrester, so as to overcome existing survey
Try the larger technical problem of leakage current of an arrester floating.
A kind of test circuit for metal oxide arrester that the utility model embodiment provides, including：Direct current pressure
Raw device, filter capacitor, electrostatic voltmeter, DC microammeter and arrester；The filter capacitor and the DC voltage generator
Parallel connection, the electrostatic voltmeter are in parallel with the DC voltage generator；One end of the arrester and the direct current pressure
One end of raw device is connected, and the other end of the arrester is another by the DC microammeter and the DC voltage generator
End is connected；By double between the DC voltage generator, filter capacitor, electrostatic voltmeter, DC microammeter and arrester
Shielding line is connected.
In a kind of possible implementation, the test circuit also includes：Protective resistance；The DC voltage generator with
It is in parallel with the filter capacitor and the electrostatic voltmeter respectively after the protective resistance series connection.
In a kind of possible implementation, the test circuit is arranged on the substrate of insulation against ground.
In a kind of possible implementation, the DC voltage generator independent grounding.
In a kind of possible implementation, the DC voltage generator is 300kV/3mA high voltage direct current generators.
In a kind of possible implementation, the arrester is Zinc-Oxide Arrester.
The test circuit for the metal oxide arrester that the utility model embodiment provides, double shield is arranged to by connecting line
Line, so as to effectively mask the stray electrical current under forceful electric power field intensity, the Leakage Current of measurement can be caused to be closer to
Actual value.Meanwhile it is hanging during this double shield thread test, without high voltage insulated cable, so this test wire is in light weight, cost is low.
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 a further understanding of the present invention, and a part for constitution instruction, the reality with the present invention
Apply example to be used to explain the present invention together, be not construed as limiting the invention.In the accompanying drawings：
Fig. 1 is the first test circuit figure of the metal oxide arrester that the utility model embodiment provides；
Fig. 2 is the second test circuit figure of the metal oxide arrester that the utility model embodiment provides.
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.
The utility model embodiment provides a kind of test circuit of metal oxide arrester, for metal oxide
(MOA, Metal Oxide Arrester) arrester carries out preventive trial.Shown in Figure 1, the test circuit is specifically wrapped
Include：DC voltage generator DC, filter capacitor C, electrostatic potential Table V, DC microammeter A and arrester F.
Specifically, shown in Figure 1, filter capacitor C is in parallel with DC voltage generator DC, electrostatic potential Table V also with directly
It is in parallel to flow voltage generator DC.DC voltage generator DC is used to produce high voltage direct current, and filter capacitor C is used to filter in circuit
Harmonic wave, improve the stability of DC voltage generator DC power supply.Electrostatic potential Table V is used for the voltage for measuring arrester F both ends.
Arrester F one end is connected with DC voltage generator DC one end, and the arrester F other end passes through direct current microampere
Table A is connected with the DC voltage generator DC other end.It is i.e. shown in Figure 1, arrester connected with DC microammeter A after again with
DC voltage generator DC is in parallel.In the utility model embodiment, arrester F is metal oxide arrester, is specifically as follows
Zinc-Oxide Arrester.DC microammeter A is used to measure the other electric current of microampere order, and for improving measurement accuracy, and measurement range is big
In 1mA.
In addition, between DC voltage generator DC, filter capacitor C, electrostatic potential Table V, DC microammeter A and arrester F
It is connected by double shield line.That is the connecting line in Fig. 1 between each device uses double shield line.
Connecting line is arranged to double shield line in the utility model embodiment, so as to effectively mask forceful electric power field intensity
Under stray electrical current, can cause measurement Leakage Current be closer to actual value.In the utility model embodiment, direct current
Pressure generator DC uses 300kV/3mA high voltage direct current generators, respectively when connecting line is single shielding line and double shield line to same
One arrester is tested, and the insulaion resistance of the arrester can reach more than 100000M Ω, tentatively can judge inside arrester
Do not make moist, it is as follows to the test result of leakage current.
Specifically, the output voltage of DC voltage generator is adjusted first so that the 1mA electric currents of DC microammeter side, and
The critical voltage of record now.Afterwards using electrostatic voltmeter by the critical voltage of magnitude of voltage near 75%, and it is micro- according to direct current
Pacify table measurement leakage current；Now, because Leakage Current value is smaller, digital multimeter measurement leakage current can also be used.Its
In, the result tested using single shielded pair arrester per phase node is as shown in table 1 below：
Table 1
The knot that the test circuit that the double shield line provided using the utility model embodiment is connected is tested arrester
Fruit is as shown in table 2 below：
Table 2
It can be seen from table 1, using under the critical voltage and 75% critical voltage under single shielding line circuit measuring arrester 1mA
Leakage Current when, there is no certain rule per the critical voltage value between mutually often saving, when it is big when it is small, and leakage current all exists
More than 100 μ A.And when being generally acknowledged that leakage current is more than 50 μ A, then it is assumed that the arrester has situation about making moist.And according to insulation
The measurement result of resistance understands that the arrester does not make moist substantially, the two conclusion contradiction.
And when using the double shield line test circuit of the utility model embodiment offer to be tested, ginseng is shown in Table 2, often
The critical voltage value mutually often saved under 1mA is more or less the same, and the Leakage Current under 75% critical voltage meets all within 50 μ A
Numerical value as defined in prerun code.
The test circuit for the metal oxide arrester that the utility model embodiment provides, double shield is arranged to by connecting line
Line, so as to effectively mask the stray electrical current under forceful electric power field intensity, the Leakage Current of measurement can be caused to be closer to
Actual value.Meanwhile it is hanging during this double shield thread test, without high voltage insulated cable, so this test wire is in light weight, cost is low.
Shown in Figure 2 in a kind of possible implementation, the test circuit also includes：Protective resistance R.Protection electricity
Hinder for protecting test circuit.As shown in Fig. 2 DC voltage generator DC connected with protective resistance R after again respectively with filtered electrical
Hold C and electrostatic potential Table V is in parallel.
In a kind of possible implementation, test circuit is arranged on the substrate of insulation against ground.It thereby may be ensured that survey
Insulation shielding state is in during examination.Meanwhile DC voltage generator DC independent groundings.
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 (6)
- A kind of 1. test circuit of metal oxide arrester, it is characterised in that including：DC voltage generator, filter capacitor, Electrostatic voltmeter, DC microammeter and arrester；The filter capacitor is in parallel with the DC voltage generator, and the electrostatic voltmeter and the DC voltage generator are simultaneously Connection；One end of the arrester is connected with one end of the DC voltage generator, and the other end of the arrester passes through described DC microammeter is connected with the other end of the DC voltage generator；Pass through double shield between the DC voltage generator, filter capacitor, electrostatic voltmeter, DC microammeter and arrester Line is connected.
- 2. test circuit according to claim 1, it is characterised in that also include：Protective resistance；The DC voltage generator connected with the protective resistance after respectively with the filter capacitor and the electrostatic voltmeter It is in parallel.
- 3. test circuit according to claim 1, it is characterised in that the test circuit is arranged at the substrate of insulation against ground On.
- 4. test circuit according to claim 1, it is characterised in that the DC voltage generator independent grounding.
- 5. test circuit according to claim 3, it is characterised in that the DC voltage generator is that 300kV/3mA is straight Flow high pressure generator.
- 6. according to any described test circuits of claim 1-5, it is characterised in that the arrester is Zinc-Oxide Arrester.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720762510.1U CN206818820U (en) | 2017-06-28 | 2017-06-28 | Test circuit of metal oxide arrester |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720762510.1U CN206818820U (en) | 2017-06-28 | 2017-06-28 | Test circuit of metal oxide arrester |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN206818820U true CN206818820U (en) | 2017-12-29 |
Family
ID=60762516
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201720762510.1U Expired - Fee Related CN206818820U (en) | 2017-06-28 | 2017-06-28 | Test circuit of metal oxide arrester |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN206818820U (en) |
-
2017
- 2017-06-28 CN CN201720762510.1U patent/CN206818820U/en not_active Expired - Fee Related
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20171229 |