CN109358224A - Polypropylene film flashover voltage measuring device and method under a kind of temperature gradient - Google Patents
Polypropylene film flashover voltage measuring device and method under a kind of temperature gradient Download PDFInfo
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- CN109358224A CN109358224A CN201811161797.8A CN201811161797A CN109358224A CN 109358224 A CN109358224 A CN 109358224A CN 201811161797 A CN201811161797 A CN 201811161797A CN 109358224 A CN109358224 A CN 109358224A
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- voltage
- finger electrodes
- polypropylene film
- temperature
- flashover
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
- G01R19/0084—Arrangements for measuring currents or voltages or for indicating presence or sign thereof measuring voltage only
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- Testing Relating To Insulation (AREA)
Abstract
The invention discloses polypropylene film flashover voltage measuring device and methods under a kind of temperature gradient, device includes high pressure temperature-controlled cabinet, oscillograph and high-voltage DC power supply, insulating support is provided in the high pressure temperature-controlled cabinet, insulation board is provided at the top of insulating support, a pair of of finger electrodes are provided with above insulation board, the finger electrodes are used to polypropylene film sample being pressed in the insulating support, spacing between finger electrodes is 8mm, the end of two finger electrodes passes through screw and fixes with the insulation board, one of finger electrodes are grounded through protective resistance, another finger electrodes is electrically connected with high-voltage DC power supply, the oscillograph is parallel in the route of finger electrodes and high-voltage DC power supply, flashover voltage value is judged by oscilloscope measurement voltage waveform.It is demonstrated experimentally that the measuring device and method can effectively measure polypropylene film flashover voltage value at different temperatures.
Description
Technical field
The present invention relates to polypropylene film flashover voltage fields of measurement, and in particular to polypropylene film under a kind of temperature gradient
Flashover voltage measuring device and method.
Background technique
Power capacitor plays irreplaceable role in current electric system, and polypropylene (PP) film is to answer at present
Primary dielectric material for power capacitor.When power capacitor is run, the aggregation of polypropylene film surface charge is caused
Electric field distortion greatly enhances local electric field strength, easily generation edge flashing failure.Meanwhile power capacitor is in operation,
Fever caused by electrode resistance heat pyrexia and dielectric loss can cause capacitor internal temperature to rise, and cause as dielectric poly-
Polypropylene film bears higher temperature.Influence of the temperature to flashover voltage is very big, studies polypropylene film flashover under temperature gradient
The measuring device and measuring method of voltage are of great significance.
In the research of recent decades, research is unfolded to the edge flashing phenomenon of polymer material in some scholars.However, right
In being applied to, flashover voltage survey quantifier elimination of the dielectric polypropylene film of power capacitor under temperature gradient is less.
Summary of the invention
Purpose of the invention is to overcome the shortcomings in the prior art, provides polypropylene film under a kind of temperature gradient and dodges
Network voltage measuring apparatus and method；Powerful support is provided for polypropylene film flashover property under analysis different temperatures.Experiment card
Bright, the measuring device and method can effectively measure polypropylene film flashover voltage value at different temperatures.
The purpose of the present invention is what is be achieved through the following technical solutions:
Polypropylene film flashover voltage measuring device under a kind of temperature gradient, including high pressure temperature-controlled cabinet, oscillograph and
High-voltage DC power supply is provided with insulating support in the high pressure temperature-controlled cabinet, is provided with insulation board at the top of insulating support, insulate
A pair of of finger electrodes are provided with above plate, the finger electrodes are used to polypropylene film sample being pressed in the insulating support
On, the spacing between finger electrodes is 8mm, and the end of two finger electrodes passes through screw and fixes with the insulation board, wherein
One finger electrodes is grounded through protective resistance, another finger electrodes is electrically connected with high-voltage DC power supply, and the oscillograph is in parallel
In the route of finger electrodes and high-voltage DC power supply, flashover voltage value is judged by oscilloscope measurement voltage waveform.
Further, the voltage resolution of the high-voltage DC power supply is 0.01kV, and providing voltage range is 0-30kV.
Further, the insulation board is epoxy resin material.
Further, the high pressure temperature-controlled cabinet uses 220V power supply power supply, power 1600W, and temperature control range is
20-250 DEG C, even temperature control in the cavity of high pressure temperature-controlled cabinet may be implemented.
Further, the diameter of the opposite one end of two finger electrodes is 6mm.
Polypropylene film flashover voltage measurement method under a kind of temperature gradient, comprising the following steps:
(1) polypropylene film sample is cut into 40 × 40mm size, is wiped polypropylene film sample with absolute alcohol
It wipes
Completely, and in a vacuum drying oven 1h is stood；
(2) sample is lain on insulation board, is compressed respectively with two finger electrodes；
(3) sample and finger electrodes are placed in high pressure temperature-controlled cabinet, setting temperature is 40 DEG C, preheats sample 20min；
(4) high voltage direct current source switch is opened, voltage is increased with the speed of 1kV/s, until flashover occurs, record dodges
Oscillograph voltage value is flashover voltage value when network occurs；
(5) step (1)-(4) are repeated, each temperature gradient does 20 tests, obtains 20 flashover voltage values；
(6) step (1)-(5) are repeated, the preheating temperature in step (3) is successively changed to 60,80 DEG C every time, obtains difference
At a temperature of polypropylene film flashover voltage value.
Compared with prior art, the beneficial effects brought by the technical solution of the present invention are as follows:
It is proved by specific experiment, the temperature of the adjustable electrode of high pressure temperature-controlled cabinet, sample etc., realizes different temperatures
Under flashover voltage measurement, the present apparatus realizes the measurement of polypropylene film flashover voltage under different temperatures.And it can obtain temperature
Influence to flashover voltage is very big, as the raised flashover voltage of temperature significantly reduces.
Detailed description of the invention
Fig. 1 is the structural schematic diagram of measuring device of the present invention.
Fig. 2 is polypropylene film flashover voltage Weibull distribution figure under temperature gradient.
Icon note: 1- high pressure temperature-controlled cabinet, 2- high-voltage DC power supply, 3- oscillograph, 4- insulating support, 5- insulation board,
6- sample, 7- finger electrodes
Specific embodiment
The invention will be further described with reference to the accompanying drawing.
As shown in Figure 1, polypropylene film flashover voltage measuring device under a kind of temperature gradient, including high pressure temperature-controlled cabinet
1, oscillograph 3 and high-voltage DC power supply 2 are provided with insulating support 4 in high pressure temperature-controlled cabinet 1, are provided at the top of insulating support 4
Insulation board 5 is provided with a pair of of finger electrodes 7 above insulation board 5, and finger electrodes 7 are for polypropylene film sample 6 to be pressed in absolutely
On edge bracket 4, the spacing between finger electrodes 7 is 8mm, and the end of finger electrodes 7 passes through screw and insulation board 5 is fixed,
In a finger electrodes be grounded through protective resistance, another finger electrodes by electrical connection is connect with high-voltage DC power supply.
Its flashover voltage under temperature gradient is measured as sample using polypropylene (PP) film in the present embodiment, is tried
Sample 6 is having a size of 40 × 40mm of side length, and 40 μm of thickness.
High-voltage DC power supply 2 is using the literary high voltage power supply in east, voltage resolution 0.01kV, voltage range 0-30kV.
Finger electrodes are copper material, and the diameter of the opposite one end of two finger electrodes is 6mm, and the other end, that is, end connection is high
Press DC power supply 2.Oscillograph 3 in the line by its parallel connection is surveyed by oscillograph using the oscillograph of model UTD2102CEX
Amount voltage waveform judges flashover voltage value.
High pressure temperature-controlled cabinet 1 uses YC-450A+ type electrothermostat, using 220V power supply power supply, power 1600W,
Its temperature control range is 20-250 DEG C, and even temperature control in thermotank cavity may be implemented.
Polypropylene film flashover voltage measurement method under temperature gradient is carried out by above-mentioned apparatus, comprising the following steps:
Polypropylene (PP) film sample is cut into 40 × 40mm size, with absolute alcohol by PP film wiped clean,
And 1h is stood in a vacuum drying oven.
Sample is lain on epoxy insulating board, is compressed respectively with two finger electrodes.
Sample and finger electrodes are placed in high pressure temperature-controlled cabinet, and setting temperature is 40 DEG C, preheat sample 20min.
High voltage direct current source switch is opened, voltage is increased with the speed of 1kV/s, until flashover occurs, records flashover
Oscillograph voltage value is flashover voltage value when generation.
Repeat the above steps 1-4, and each temperature gradient does 20 tests, obtains 20 flashover voltage values.
Repeat the above steps 1-5, and the preheating temperature in step 3 is successively changed to 60,80 DEG C every time, it can be deduced that different
At a temperature of PP film flashover voltage value.
As shown in Fig. 2, being plotted as Weibull distribution figure for the data measured are tested above, obtain when probability is 63.2%
Flashover voltage value.
The present invention is not limited to embodiments described above.Above the description of specific embodiment is intended to describe and say
Bright technical solution of the present invention, the above mentioned embodiment is only schematical, is not restrictive.This is not being departed from
In the case of invention objective and scope of the claimed protection, those skilled in the art may be used also under the inspiration of the present invention
The specific transformation of many forms is made, within these are all belonged to the scope of protection of the present invention.
Claims (6)
1. polypropylene film flashover voltage measuring device under a kind of temperature gradient, which is characterized in that including high pressure temperature-controlled cabinet,
Oscillograph and high-voltage DC power supply are provided with insulating support in the high pressure temperature-controlled cabinet, are provided at the top of insulating support absolutely
Listrium, insulation board top are provided with a pair of of finger electrodes, and the finger electrodes are used to for polypropylene film sample being pressed in described
On insulating support, the spacing between finger electrodes is 8mm, and the end of two finger electrodes passes through screw and the insulation board is solid
Fixed, one of finger electrodes are grounded through protective resistance, another finger electrodes is electrically connected with high-voltage DC power supply, the oscillography
Device is parallel in the route of finger electrodes and high-voltage DC power supply, judges flashover voltage value by oscilloscope measurement voltage waveform.
2. polypropylene film flashover voltage measuring device under a kind of temperature gradient according to claim 1, which is characterized in that institute
The voltage resolution for stating high-voltage DC power supply is 0.01kV, and providing voltage range is 0-30kV.
3. polypropylene film flashover voltage measuring device under a kind of temperature gradient according to claim 1, which is characterized in that institute
Stating insulation board is epoxy resin material.
4. polypropylene film flashover voltage measuring device under a kind of temperature gradient according to claim 1, which is characterized in that institute
High pressure temperature-controlled cabinet is stated using 220V power supply power supply, power 1600W, temperature control range is 20-250 DEG C, and height may be implemented
Press even temperature control in the cavity of temperature-controlled cabinet.
5. polypropylene film flashover voltage measuring device under a kind of temperature gradient according to claim 1, which is characterized in that two
The diameter of the opposite one end of a finger electrodes is 6mm.
6. polypropylene film flashover voltage measurement method under a kind of temperature gradient is dodged based on polypropylene film described in claim 1
Network voltage measuring apparatus, which comprises the following steps:
(1) polypropylene film sample is cut into 40 × 40mm size, is wiped polypropylene film sample with absolute alcohol
Only, and in a vacuum drying oven stand 1h；
(2) sample is lain on insulation board, is compressed respectively with two finger electrodes；
(3) sample and finger electrodes are placed in high pressure temperature-controlled cabinet, setting temperature is 40 DEG C, preheats sample 20min；
(4) high voltage direct current source switch is opened, voltage is increased with the speed of 1kV/s, until flashover occurs, record flashover hair
Oscillograph voltage value is flashover voltage value when raw；
(5) step (1)-(4) are repeated, each temperature gradient does 20 tests, obtains 20 flashover voltage values；
(6) step (1)-(5) are repeated, the preheating temperature in step (3) is successively changed to 60,80 DEG C every time, obtains different temperatures
Lower polypropylene film flashover voltage value.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811161797.8A CN109358224A (en) | 2018-09-30 | 2018-09-30 | Polypropylene film flashover voltage measuring device and method under a kind of temperature gradient |
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| CN201811161797.8A CN109358224A (en) | 2018-09-30 | 2018-09-30 | Polypropylene film flashover voltage measuring device and method under a kind of temperature gradient |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110967563A (en) * | 2019-12-19 | 2020-04-07 | 上海交通大学 | Non-intrusive surface potential measuring device for surface flashover |
| CN113960392A (en) * | 2021-09-14 | 2022-01-21 | 河北工业大学 | Aviation insulating material modification method capable of improving flashover voltage and test system thereof |
| CN117310402A (en) * | 2023-09-18 | 2023-12-29 | 国网宁夏电力有限公司电力科学研究院 | Method and system for testing flashover characteristics of low-temperature insulating material |
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| CN108490276A (en) * | 2018-01-25 | 2018-09-04 | 天津大学 | A kind of polypropylene film temperature field lower surface charge detecting device and measurement method |
| CN209182380U (en) * | 2018-09-30 | 2019-07-30 | 天津大学 | Polypropylene film flashover voltage measuring device under a kind of temperature gradient |
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| CN102841123A (en) * | 2012-09-04 | 2012-12-26 | 西安交通大学 | Measuring device and measuring method for trap parameter of solid dielectric material |
| CN102928718A (en) * | 2012-11-06 | 2013-02-13 | 华北电力大学 | Superconductivity insulation material electrical characteristic test device |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110967563A (en) * | 2019-12-19 | 2020-04-07 | 上海交通大学 | Non-intrusive surface potential measuring device for surface flashover |
| CN113960392A (en) * | 2021-09-14 | 2022-01-21 | 河北工业大学 | Aviation insulating material modification method capable of improving flashover voltage and test system thereof |
| CN117310402A (en) * | 2023-09-18 | 2023-12-29 | 国网宁夏电力有限公司电力科学研究院 | Method and system for testing flashover characteristics of low-temperature insulating material |
| CN117310402B (en) * | 2023-09-18 | 2024-06-04 | 国网宁夏电力有限公司电力科学研究院 | Method and system for testing flashover characteristics of low-temperature insulating material |
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