CN205103317U - Measurement device for solid insulating material volume resistivity - Google Patents
Measurement device for solid insulating material volume resistivity Download PDFInfo
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- CN205103317U CN205103317U CN201520948222.6U CN201520948222U CN205103317U CN 205103317 U CN205103317 U CN 205103317U CN 201520948222 U CN201520948222 U CN 201520948222U CN 205103317 U CN205103317 U CN 205103317U
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- field electrode
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Abstract
The utility model discloses a measurement device for solid insulating material volume resistivity, including low -field electrode, high voltage electrode, height regulating mechanism and be provided with guard electrode's guard screen mechanism, low -field electrode, high voltage electrode and guard screen establishment of institution are in height regulating mechanism, and wherein low -field electrode and high voltage electrode relative up -down set up, and the guard screen establishment of institution is in low -field electrode week side. The utility model discloses an use, can overcome on outside induced -current disturbs the basis, carry out the accurate measurement to the volume resistivity of testee, have convenient operation, measurement accuracy high, require low advantage to testee shape size.
Description
Technical field
The utility model relates to resistive measurement field, particularly a kind of device for measuring solid insulating material specific insulation.
Background technology
Insulating material, also known as dielectric, under DC voltage effect, only has atomic little electric current to pass through, for by mutually insulated or insulation against ground between each parts of electrical system; Solid insulating material is that one has certain thickness insulating material, not only play insulating effect, also can play mechanical support effect, therefore, generally all wish that insulating material has insulation resistance high as far as possible, and there is good mechanical property, chemical property and heat resistance.
The resistivity characterizing insulating material has surface resistivity and specific insulation two kinds of Common Parameters, wherein whether specific insulation is often used to detect insulating material and produces and remain the same from beginning to end, or detects the conductive impurity that can affect quality of materials and can not detect with additive method.
Specific insulation refers to the resistance value that in unit volume, dielectric has, and the method for measurement volumes resistivity is by applying DC voltage to sample, measuring the specific insulation by calculating sample perpendicular to the leakage current of sample.Based on above-mentioned measuring principle, the equipment being conventionally used to measurement volumes resistivity is megger, the measuring mechanism of megger is magnetoelectricity series logolmeter, indicating mode has pointer and digital, but the no matter megger of which kind of structure, the specific insulation for insulating material is measured all exists the problem that measuring accuracy is low, cannot overcome the interference of outside induction current.
Chinese patent CN101968511B discloses the micro-machine experimental provision of a kind of mineral and solid insulating material resistivity measurement, adopt three-electrode system (namely potential electrode, guard electrode and high-field electrode are formed) principle of work, by the problem adopting guard electrode ground connection to overcome the interference of outside induction current; But its complex structure, exactitude position is needed between potential electrode and high-field electrode, and clearance distance between potential electrode and guard electrode is wayward when making, if therefore this device slightly deviation in manufacturing process, three electrodes will be caused accurately not locate, just be difficult to obtain reliable measurements data, also easily occur short circuit, destroy equipment; In addition, the structure of this device only can be tested for the testee of fixed size, cannot meet the testing requirement of different size testee.
Utility model content
The utility model technical issues that need to address be to provide a kind of easy to operate, measuring accuracy is high, can overcome outside induction current interference solid insulating material specific insulation measurement mechanism.
For solving the problems of the technologies described above, technical solution adopted in the utility model is as follows.
A kind of measurement mechanism of solid insulating material specific insulation; comprise low-field electrode, high-field electrode, height adjustment mechanism and be provided with the protection mask mechanism of guard electrode; described low-field electrode, high-field electrode and protection mask organization establishes are in height adjustment mechanism; wherein low-field electrode and high-field electrode are oppositely arranged up and down, and protection mask organization establishes is in low-field electrode week side.
The measurement mechanism of above-mentioned a kind of solid insulating material specific insulation, described height adjustment mechanism comprises the upper backup pad and lower supporting plate that be arranged in parallel, connected by least three rhizoid bars perpendicular to back up pad between upper backup pad and lower supporting plate, regulate the distance between upper backup pad and lower supporting plate by nut between screw mandrel and back up pad and locate; The even cloth of described screw mandrel is between upper backup pad and lower supporting plate.
The measurement mechanism of above-mentioned a kind of solid insulating material specific insulation, the longitudinal section of described high-field electrode is T-type structure, and the vertical section bottom of high-field electrode passes perpendicularly through and stretches out lower supporting plate center.
The measurement mechanism of above-mentioned a kind of solid insulating material specific insulation, is provided with the hold-down mechanism for being pressed on by testee between high-field electrode and low-field electrode between described high-field electrode and lower supporting plate; Described hold-down mechanism comprises the lower insulation plate being parallel to high-field electrode, is provided with the spring for being held out against by lower insulation plate in high-field electrode lower surface between lower insulation plate and lower supporting plate.
The measurement mechanism of above-mentioned a kind of solid insulating material specific insulation, described low-field electrode is fixedly installed on upper backup pad lower surface by upper insulation plate, and protection mask organization establishes is between low-field electrode and upper insulation plate; Protection mask mechanism comprises the guard electrode that ring low-field electrode side week is arranged and the insulating electrode be arranged between guard electrode and low-field electrode.
The measurement mechanism of above-mentioned a kind of solid insulating material specific insulation, the longitudinal section of described low-field electrode is T-type structure, and the vertical section top of low-field electrode passes perpendicularly through and stretches out upper backup pad center.
The measurement mechanism of above-mentioned a kind of solid insulating material specific insulation, is provided with the tin hat for the protection of the vertical section of low-field electrode, the sidewall of tin hat is provided with bnc interface above described upper backup pad.
Owing to have employed above technical scheme, acquired by the utility model, technical progress is as follows.
Application of the present utility model, can overcome outside induction current interference basis on, carry out Measurement accuracy to the specific insulation of testee, have easy to operate, measuring accuracy is high, the advantage low to the requirement of testee shape size.The setting of height adjustment mechanism, can enable the utility model be applied to the testee of different-thickness, improve versatility; The setting of hold-down mechanism, can make testee and reliable contacts between high-field electrode and low-field electrode, improve measuring accuracy; The bnc interface that the tin hat arranged above upper backup pad and tin hat are arranged, not only can protect low-field electrode, the lead-in wire of low-field electrode and guard electrode can also be drawn, facilitate operating personnel's wiring fast and accurately.
Accompanying drawing explanation
Fig. 1 is structural representation of the present utility model;
Fig. 2 is the structural representation of height adjustment mechanism described in the utility model;
Fig. 3 is the structural representation of hold-down mechanism described in the utility model;
Fig. 4 is the structural representation of protection mask mechanism described in the utility model;
Fig. 5 is structure split figure of the present utility model;
Fig. 6 is test circuit figure of the present invention.
Wherein: 1, tin hat; 2, bnc interface; 3, upper backup pad; 4, nut; 5, upper insulation plate; 6, guard electrode; 7, insulating electrode; 8, low-field electrode; 9, screw mandrel; 10, testee; 11, high-field electrode; 12, spring; 13, lower insulation plate; 14, lower supporting plate.
Embodiment
Below in conjunction with the drawings and specific embodiments, the utility model is further elaborated.
The utility model provides a kind of measurement mechanism of solid insulating material specific insulation; the structure of this measurement mechanism as shown in Figures 1 to 5; specifically comprise low-field electrode 8, high-field electrode 11, height adjustment mechanism and be provided with the protection mask mechanism of guard electrode 6; low-field electrode 8, high-field electrode 11 and protection mask organization establishes are in height adjustment mechanism; wherein low-field electrode and high-field electrode are oppositely arranged up and down, and protection mask organization establishes is in low-field electrode week side.
The structure of height adjustment mechanism as shown in Figure 2, comprise the upper backup pad 3 and lower supporting plate 14 that be arranged in parallel, connected by least three rhizoid bars 9 perpendicular to back up pad between upper backup pad and lower supporting plate, located by nut 4 between screw mandrel and back up pad, and regulate the distance between upper backup pad and lower supporting plate by the position of setting nut on screw mandrel, meet the measurement requirement of different-thickness testee.In the present embodiment, screw mandrel is provided with four altogether, and the even cloth of four rhizoid bars is between upper backup pad and lower supporting plate.
The longitudinal section of the high-field electrode 11 in the utility model and the longitudinal section of low-field electrode 8 are T-type structure, and high-field electrode 11 and low-field electrode 8 are circular flat with the surface of contact of testee.For convenience of wiring, the vertical section bottom of high-field electrode passes perpendicularly through and stretches out lower supporting plate 14 center, and the vertical section top of low-field electrode 8 passes perpendicularly through and stretches out upper backup pad 3 center.
Due to the vertical section top of low-field electrode stretch out upper backup pad after exposed setting; for the vertical section of protection low-field electrode, the present embodiment is provided with tin hat 1 above upper backup pad 3, the sidewall of tin hat 1 is provided with bnc interface 2; the wiring of convenient extraction low-field electrode, as shown in Figure 1.
In the present embodiment, low-field electrode and high-field electrode are selected and to be easily added on testee, to be unlikely because of electrode resistance or the conductive material pollution of testee being introduced to very big error with testee intimate surface contact.
Hold-down mechanism is provided with, for being pressed between high-field electrode 11 and low-field electrode 8 by testee between high-field electrode 11 and lower supporting plate 14.The structure of hold-down mechanism as shown in Figure 3, comprise lower insulation plate 13 and spring 12, lower insulation plate 13 is set in parallel in the below of high-field electrode, spring 12 is at least provided with three, three even cloth of spring are between lower insulation plate 13 and lower supporting plate 14, for lower insulation plate is held out against in high-field electrode lower surface, hold out against to low-field electrode by high-field electrode, thus testee is pressed on the object between high-field electrode and low-field electrode by realization.In the present embodiment, spring is provided with four altogether.
Low-field electrode 8 is fixedly installed on upper backup pad 3 by upper insulation plate 5, and protection mask organization establishes is between low-field electrode 8 and upper insulation plate 5.Protection mask mechanism is used for the stray current that external stray voltage produces to be diverted to outside metering circuit; namely for shielding the electric current transmitted from surrounding space; electric current in circuit only allows to be that high-field electrode passes through in measured object, therefore can greatly reduce the probability of error.The concrete structure of protection mask mechanism as shown in Figure 4, comprises guard electrode 6 and insulating electrode 7, and guard electrode 6 ring low-field electrode 8 weeks sides are arranged, and insulating electrode 7 is arranged between guard electrode 6 and low-field electrode 8.Guard electrode 6 in the present embodiment is aluminium ring, and insulating electrode 7 is teflon insulation ring.
For convenience of assembling, the upper backup pad 3 in the present embodiment, upper insulation plate 5, guard electrode 6, insulating electrode 7 low-field electrode 8 horizontal segment, high-field electrode 11 horizontal segment, lower insulation plate 13 and lower supporting plate 14 all adopt round pie structure.
Using method of the present utility model is as follows.
First, connect metering circuit: metering circuit connects as shown in Figure 6, between the low-field electrode 8 testee 10 being clamped in three electrode measurement devices and high-field electrode 11, high-field electrode connects high-voltage DC power supply positive pole, and low-field electrode is through measuring resistance R
0connect high-voltage DC power supply negative pole, guard electrode 6 ground connection of three electrode measurement devices; Distinguish a voltage table in parallel at the two ends of the two ends of high-voltage DC power supply and measuring resistance, measure high-voltage DC power supply output voltage U
1with standard resistor at two terminals voltage U
2.
Secondly, measure short-circuit current: by low-field electrode 8 and the high-field electrode 11 of external connection short circuit three electrode measurement device, progressively increase electric current until short-circuit current reaches steady state value, record short-circuit current I
0value and direction.Short-circuit current I
0by standard resistor at two terminals voltage U
2with measuring resistance R
0calculate and obtain.
Before progressively increasing electric current, need to regulate, in adjustment process the sensitivity of three electrode measurement devices, observe the change of short-circuit current simultaneously, until short-circuit current reaches steady state value, this value should be less than the stationary value of electrification current, or is less than the electric current of electrochemical 100min.Because short-circuit current likely changes direction, even if therefore short-circuit current is zero, short-circuit condition also to be maintained to the time needed; As short-circuit current I
0when becoming substantially constant, write down short-circuit current I
0value and direction.
Then, measure electrification current: remove shorting stub, apply nominal DC voltage U to testee
xand start timing, within the different electrification time, do one-shot measurement respectively, each electrification current I measured of record
s.The electrochemical time different in this step is 1min, 2min, 5min, 10min, 50min, 100min.
Finally, testee specific insulation is calculated: as the electrification current I of double measurement
stime identical, utilize this electrification current I
s, short-circuit current I
0, DC voltage U
x, useful area A that three electrode measurement device low-field electrodes contact with testee and testee average thickness h calculate the specific insulation of testee.
This step D calculates specific insulation ρ by following formula
v:
In formula, U
xfor nominal DC voltage, A is the useful area that low-field electrode contacts with testee, I
sfor electrification current, I
0for short-circuit current, h is the average thickness of testee.
Claims (7)
1. the measurement mechanism of a solid insulating material specific insulation; it is characterized in that; comprise low-field electrode (8), high-field electrode (11), height adjustment mechanism and be provided with the protection mask mechanism of guard electrode (6); described low-field electrode (8), high-field electrode (11) and protection mask organization establishes are in height adjustment mechanism; wherein low-field electrode and high-field electrode are oppositely arranged up and down, and protection mask organization establishes is in low-field electrode week side.
2. the measurement mechanism of a kind of solid insulating material specific insulation according to claim 1, it is characterized in that, described height adjustment mechanism comprises the upper backup pad (3) and lower supporting plate (14) that be arranged in parallel, connected by least three rhizoid bars (9) perpendicular to back up pad between upper backup pad and lower supporting plate, regulate the distance between upper backup pad and lower supporting plate by nut (4) between screw mandrel and back up pad and locate; The even cloth of described screw mandrel is between upper backup pad and lower supporting plate.
3. the measurement mechanism of a kind of solid insulating material specific insulation according to claim 2, is characterized in that, the longitudinal section of described high-field electrode (11) is T-type structure, and the vertical section bottom of high-field electrode passes perpendicularly through and stretches out lower supporting plate (14) center.
4. the measurement mechanism of a kind of solid insulating material specific insulation according to claim 3, it is characterized in that, between described high-field electrode (11) and lower supporting plate (14), being provided with the hold-down mechanism for being pressed on by testee between high-field electrode (11) and low-field electrode (8); Described hold-down mechanism comprises the lower insulation plate (13) being parallel to high-field electrode, is provided with the spring (12) for being held out against by lower insulation plate in high-field electrode lower surface between lower insulation plate (13) and lower supporting plate (14).
5. the measurement mechanism of a kind of solid insulating material specific insulation according to claim 2, it is characterized in that, described low-field electrode (8) is fixedly installed on upper backup pad (3) by upper insulation plate (5), and protection mask organization establishes is between low-field electrode (8) and upper insulation plate (5); Protection mask mechanism comprises the guard electrode (6) that all sides of ring low-field electrode (8) are arranged and the insulating electrode (7) be arranged between guard electrode (6) and low-field electrode (8).
6. the measurement mechanism of a kind of solid insulating material specific insulation according to claim 5, it is characterized in that, the longitudinal section of described low-field electrode (8) is T-type structure, and the vertical section top of low-field electrode (8) passes perpendicularly through and stretches out upper backup pad (3) center.
7. the measurement mechanism of a kind of solid insulating material specific insulation according to claim 6; it is characterized in that; described upper backup pad (3) top is provided with the tin hat (1) for the protection of the vertical section of low-field electrode, the sidewall of tin hat (1) is provided with bnc interface (2).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520948222.6U CN205103317U (en) | 2015-11-25 | 2015-11-25 | Measurement device for solid insulating material volume resistivity |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520948222.6U CN205103317U (en) | 2015-11-25 | 2015-11-25 | Measurement device for solid insulating material volume resistivity |
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| Publication Number | Publication Date |
|---|---|
| CN205103317U true CN205103317U (en) | 2016-03-23 |
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ID=55519093
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201520948222.6U Active CN205103317U (en) | 2015-11-25 | 2015-11-25 | Measurement device for solid insulating material volume resistivity |
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| Country | Link |
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| CN (1) | CN205103317U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107796988A (en) * | 2017-11-23 | 2018-03-13 | 广东电网有限责任公司电力科学研究院 | The surface resistivity measurement apparatus and method of a kind of GIS disc insulators |
| CN111077423A (en) * | 2020-01-07 | 2020-04-28 | 浙江大学 | Device and method for testing dielectric property of solid insulating material interface |
-
2015
- 2015-11-25 CN CN201520948222.6U patent/CN205103317U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107796988A (en) * | 2017-11-23 | 2018-03-13 | 广东电网有限责任公司电力科学研究院 | The surface resistivity measurement apparatus and method of a kind of GIS disc insulators |
| CN107796988B (en) * | 2017-11-23 | 2023-05-16 | 广东电网有限责任公司电力科学研究院 | Surface resistivity measuring device and method for GIS basin-type insulator |
| CN111077423A (en) * | 2020-01-07 | 2020-04-28 | 浙江大学 | Device and method for testing dielectric property of solid insulating material interface |
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| GR01 | Patent grant |