CN106353644B - Research is drifted along the experimental rig and method that day rainfall influences electrode breakdown voltage - Google Patents
Research is drifted along the experimental rig and method that day rainfall influences electrode breakdown voltage Download PDFInfo
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- CN106353644B CN106353644B CN201610588120.7A CN201610588120A CN106353644B CN 106353644 B CN106353644 B CN 106353644B CN 201610588120 A CN201610588120 A CN 201610588120A CN 106353644 B CN106353644 B CN 106353644B
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- 230000015556 catabolic process Effects 0.000 title claims abstract description 53
- 238000000034 method Methods 0.000 title claims abstract description 27
- 238000011160 research Methods 0.000 title claims abstract description 14
- 239000000428 dust Substances 0.000 claims abstract description 36
- 239000007921 spray Substances 0.000 claims abstract description 32
- 238000012360 testing method Methods 0.000 claims abstract description 26
- 239000012212 insulator Substances 0.000 claims abstract description 14
- 230000001681 protective effect Effects 0.000 claims abstract description 11
- 230000008859 change Effects 0.000 claims description 11
- 238000010998 test method Methods 0.000 claims description 9
- 239000004576 sand Substances 0.000 claims description 7
- 238000012935 Averaging Methods 0.000 claims description 6
- 230000008569 process Effects 0.000 claims description 6
- 230000005611 electricity Effects 0.000 claims description 4
- 239000000203 mixture Substances 0.000 claims description 3
- 230000005540 biological transmission Effects 0.000 description 3
- 230000001131 transforming effect Effects 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 239000002245 particle Substances 0.000 description 2
- 230000002411 adverse Effects 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 238000000691 measurement method Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/12—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing
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Abstract
It drifts along the experimental rig and method that day rainfall influences electrode breakdown voltage the invention discloses a kind of research, experimental rig, including rain test case and hookup, rain test case includes, cabinet, rainfall spray head, support insulator and electrode support, rainfall spray head is located at the top of cabinet, and support insulator is fixed on the bottom of cabinet, and electrode support is fixed on support insulator；Hookup includes pressure regulator B, transformer T, protective resistance R and capacitive divider F.It realizes and accurate obtains the rainfall of floating dust day in practical charging operation the advantages of the influence of different gap breakdown voltage.
Description
Technical field
The present invention relates to power measurement fields, and in particular, to a kind of research drifts along day rainfall to electrode breakdown voltage shadow
Loud experimental rig and method.
Background technique
Under regular air conditions, it is less that accident occurs for the power transmission and transforming equipments such as contaminated insulator, but occur floating dust weather,
When the adverse weather conditions such as rainfall, since air humidity increases, power transmission and transforming equipment surface filth absorbs the moisture in air, makes dirt
Lightning pressure drop is low, while floating dust particle can reduce the breakdown voltage of the air gap under condition of raining, so that accident rate increases.Horse
Strong chromatic number occurs for expensive auspicious proposition on April 10th, 2006 in " 410 line flashover analysis on accident cause ", Inner Mongolia,
15, power grid (secondary) line flashover accidents are caused, main cause is that the sandy environment in atmosphere causes the air gap to be failed；It congratulates
Gap breakdown voltage is compared with pure air condition under the researchs discovery Sand Dust Environment such as rich is substantially reduced, and fall is with electrode
Spacing increases and increases.The researchs such as Jiang Xingliang find that rainfall is obvious to the alternating current discharge voltage influence of stick plate the air gap, and rainfall makes
Rod-plane gap ac breakdown voltage is substantially reduced；The researchs such as Hu Yi discovery rainfall, wind and rain combination etc. can all influence the air gap
Power-frequency discharge characteristic, its discharge voltage can be made to be substantially reduced under certain condition.
At present the measurement method of breakdown voltage it is general there are two types of: 1, method of uniformly boosting；2, constant pressure lifting and lowering method.Uniformly boosting method
For ordinary test pressure method, for directly applying the voltage risen with given pace to test test product, test pressure voltage is
U is risen when test voltage value reaches 75%U, is boosted with the rate of 2%U/s, until requirements or test product puncture.The method with set
Standby or route actual operating state has very big difference, but can be to obtain mass data in the short time.Constant pressure lifting and lowering method first applies perseverance
Constant voltage, then start environmental condition needed for manufacture is tested, if being resistant to this voltage within a certain period of time, voltage is lifted and is continued
Resistance test is carried out, until electric discharge phenomena occur, then previous voltage is its withstanding voltage, but the method is generally used for filthy examination
It tests, and the test period is longer, does not use generally.
The research of the current influence for strong dust weather, rainfall for power transmission and transforming equipment both at home and abroad is more perfect, Chongqing
University, Chinese DianKeYuan, Xi'an Communications University etc. all grind dust and sand weather and rainy weather to gap breakdown voltage influence
Study carefully more.It was found that the dielectric strength of the air gap reduces in the presence of having rainfall or floating dust, electric power accident occurs often.Closely
The rainfall of several years northern areas gradually increases and dust and sand weather takes place frequently, and especially occurs in northwest China area extensive floating
Dirt and under the severe weather conditions of rainfall, the major accident that substation occurs has seriously affected China's electric system
Safe operation.Currently without the test method for proposing to influence electrode breakdown voltage for day condition of raining that drifts along, and due to sand
Dirt particle is easy electrification after friction, and charging equipment is pressed with difference with the breakdown potential without electric equipment peripheral air-gap, together
Shi Jiangyu can make the decline of floating dust concentration very fast, obtain under the gap breakdown voltage and actual conditions that are obtained using uniform boosting method
The breakdown potential in gap is pressed with difference under floating dust day condition of raining；And the test period needed for constant pressure lifting and lowering method is longer.
Summary of the invention
It is an object of the present invention in view of the above-mentioned problems, propose that a kind of research drifts along day rainfall to electrode breakdown voltage shadow
Loud experimental rig and method accurate obtains the rainfall of floating dust day to different gap breakdown potential in practical charging operation to realize
The advantages of influence of pressure.
To achieve the above object, the technical solution adopted by the present invention is that:
A kind of experimental rig studied day rainfall of drifting along and electrode breakdown voltage is influenced, including rain test case and test electricity
Road, the rain test case include that cabinet, rainfall spray head, support insulator and electrode support, the rainfall spray head are located at cabinet
Top, the support insulator is fixed on the bottom of cabinet, and the electrode support is fixed on support insulator；
The hookup includes pressure regulator B, transformer T, protective resistance R and capacitive divider F, the pressure regulator B's
Output end is electrically connected with the input terminal of transformer T, the series circuit electrical connection of the protective resistance R and capacitive divider F composition
Between two output ends of transformer T, the high pressure of the node stated between protective resistance R and capacitive divider F and cabinet
End electrical connection, between the transformer T and capacitive divider F node ground connection, and the bottom of cabinet be electrically connected.
Preferably, the rainfall spray head is four, and four rainfall spray heads are symmetrical centered on high-voltage end.
Preferably, the rainfall spray head is 0.4m at a distance from high-voltage end.
Preferably, each rainfall spray head can be switched individually, to be used to simulate different rainfalls.
Preferably, humiture atmospheric pressure table is also set up in cabinet.
Technical solution of the present invention also discloses a kind of test method of experimental rig simultaneously, comprising the following steps:
S101, electrode is fixed on electrode support, and adjusting electrode at a distance from high-voltage end is d1, utilizes uniform boosting
The breakdown voltage of fado time measuring electrode, and the breakdown voltage of the electrode repeatedly measured is averaging, it obtains under the clearance distance
Breakdown voltage, be denoted as Ub；
S102, rainfall spray head is opened, the rainfall measured at this time is C1；
S103, rainfall spray head is opened, holding rainfall is C1, and the breakdown potential of 10 sub-electrodes is measured using uniform boosting method
Pressure, and 10 breakdown voltages are averaging, so that measuring the breakdown voltage under d1 clearance distance and C1 rainfall is Uc；
S104, the 10g grains of sand are added in cabinet, open blower, wind speed is maintained at 12m/s, closes after keeping setting time
Blower；
S105, laser dust monitor is opened, when floating dust concentration is in a1 ~ a2, pressurize 0.9Uc on the electrode；
S106, rainfall spray head is opened, if gap breakdown, repeatedly S104 process, when floating dust concentration is in a1 ~ a2,
Voltage reduces 0.02 Ub on electrode；If gap does not puncture, repeatedly S104 process, electric when floating dust concentration is in a1 ~ a2
Extremely upper voltage increases by 0.02 Ub；It is Ud to obtain minimum disruptive voltage when final floating dust concentration is in a1-a2；
S107, calculating floating dust concentration are in a1 ~ a2, and clearance distance is d1 and rainfall is C1 condition to gap breakdown voltage
Maximum rate of change δ=(Ub-Ud)/Ub；
S108, change rainfall, floating dust concentration range and clearance distance, repeat above-mentioned S101 to S107 step, to obtain
Breakdown voltage maximum rate of change under to different condition.
Preferably, 1min is divided between adjacent pressurization twice in the uniform boosting method.
Preferably, setting time is 5min in the step S104.
Technical solution of the present invention has the advantages that
Technical solution of the present invention, by being simulated to floating dust and rainfall, thus the breakdown potential under obtaining different condition
Press maximum rate of change.Reach the accurate influence for obtaining the rainfall of floating dust day to different gap breakdown voltage in practical charging operation
Purpose.And the angle of bracket can be changed simultaneously, it studies under floating dust day condition of raining, electrode placed angle is to gap breakdown voltage
Influence.And the test period is short.
Below by drawings and examples, technical scheme of the present invention will be described in further detail.
Detailed description of the invention
Fig. 1 is the structural schematic diagram of rain test case described in the embodiment of the present invention；
Fig. 2 is the electronic circuitry of hookup described in the embodiment of the present invention；
Fig. 3 is the flow chart of test method described in the embodiment of the present invention.
In conjunction with attached drawing, appended drawing reference is as follows in the embodiment of the present invention:
1- cabinet；2- rainfall spray head；3- high-voltage end；4- humiture atmospheric pressure table；5- support insulator；6- electrode support.
Specific embodiment
Hereinafter, preferred embodiments of the present invention will be described with reference to the accompanying drawings, it should be understood that preferred reality described herein
Apply example only for the purpose of illustrating and explaining the present invention and is not intended to limit the present invention.
A kind of experimental rig studied day rainfall of drifting along and electrode breakdown voltage is influenced, including rain test case and test electricity
Road, as shown in Figure 1, rain test case includes, cabinet, rainfall spray head, support insulator and electrode support, rainfall spray head are located at case
The top of body, support insulator are fixed on the bottom of cabinet, and electrode support is fixed on support insulator；
As shown in Fig. 2, hookup includes, and pressure regulator B, transformer T, protective resistance R and capacitive divider F, pressure regulator B
Output end be electrically connected with the input terminal of transformer T, protective resistance R and capacitive divider F composition series circuit be connected electrically in
Between two output ends of transformer T, the high-voltage end for stating node and cabinet between protective resistance R and capacitive divider F is electrically connected
Connect, node between transformer T and capacitive divider F ground connection, and the bottom of cabinet be electrically connected.
Wherein, rainfall spray head is four, and four rainfall spray heads are symmetrical centered on high-voltage end.
Rainfall spray head is 0.4m at a distance from high-voltage end.
Each rainfall spray head can be switched individually, to be used to simulate different rainfalls.
Humiture atmospheric pressure table is also set up in cabinet.
Technical solution of the present invention also discloses a kind of test method of experimental rig simultaneously, as shown in figure 3, including following
Step:
S101, electrode is fixed on electrode support, and adjusting electrode at a distance from high-voltage end is d1, utilizes uniform boosting
The breakdown voltage of fado time measuring electrode, and the breakdown voltage of the electrode repeatedly measured is averaging, it obtains under the clearance distance
Breakdown voltage, be denoted as Ub；
S102, rainfall spray head is opened, the rainfall measured at this time is C1；
S103, rainfall spray head is opened, holding rainfall is C1, and the breakdown potential of 10 sub-electrodes is measured using uniform boosting method
Pressure, and 10 breakdown voltages are averaging, so that measuring the breakdown voltage under d1 clearance distance and C1 rainfall is Uc；
S104, the 10g grains of sand are added in cabinet, open blower, wind speed is maintained at 12m/s, closes after keeping setting time
Blower；
S105, laser dust monitor is opened, when floating dust concentration is in a1 ~ a2, pressurize 0.9Uc on the electrode；
S106, rainfall spray head is opened, if gap breakdown, repeatedly S104 process, when floating dust concentration is in a1 ~ a2,
Voltage reduces 0.02 Ub on electrode；If gap does not puncture, repeatedly S104 process, electric when floating dust concentration is in a1 ~ a2
Extremely upper voltage increases by 0.02 Ub；It is Ud to obtain minimum disruptive voltage when final floating dust concentration is in a1-a2；
S107, calculating floating dust concentration are in a1 ~ a2, and clearance distance is d1 and rainfall is C1 condition to gap breakdown voltage
Maximum rate of change δ=(Ub-Ud)/Ub；
S108, change rainfall, floating dust concentration range and clearance distance, repeat above-mentioned S101 to S107 step, to obtain
Breakdown voltage maximum rate of change under to different condition.
Since floating dust weather condition is relatively stable, S103 and S104 in above-mentioned test method can carry out sequence tune
It changes, can first add initial voltage on the electrode, sand and dust are blown into experiment casing again later.
Preferably, 1min is divided between adjacent pressurization twice in uniform boosting method.
Preferably, setting time is 5min in step S104.
Rain test cabinet used is as shown in Fig. 1 in this specific test, cabinet length, width and height be respectively 1m, 1m and
1.4m, high pressure are introduced from the high-voltage end of cabinet central upper portion position；There are four symmetrical rainfalls to spray for the upper surface dress of cabinet
Head, away from high pressure port 0.4m, entire rainfall system is a closed system, and each spray head can be switched individually, can be used for mould
Intend different rainfalls；Box house has temperature and humidity to press measuring device, air conditions when can be used for reading test；Electrode is fixed on electricity
On the bracket of pole, it is located at cabinet central region.Attached drawing 2 is test platform circuit diagram used, and B is pressure regulator in figure, and T is transformation
Device, R are protective resistance, and F is capacitive divider, and V is multimeter, and G is the air gap.
Finally, it should be noted that the foregoing is only a preferred embodiment of the present invention, it is not intended to restrict the invention,
Although the present invention is described in detail referring to the foregoing embodiments, for those skilled in the art, still may be used
To modify the technical solutions described in the foregoing embodiments or equivalent replacement of some of the technical features.
All within the spirits and principles of the present invention, any modification, equivalent replacement, improvement and so on should be included in of the invention
Within protection scope.
Claims (8)
1. a kind of test method of experimental rig, which comprises the following steps:
S101, electrode is fixed on electrode support, and adjusting electrode at a distance from high-voltage end is d1, utilizes uniform boosting fado
The breakdown voltage of secondary measuring electrode, and the breakdown voltage of the electrode repeatedly measured is averaging, obtain the breakdown under clearance distance
Voltage is denoted as Ub；
S102, rainfall spray head is opened, the rainfall measured at this time is C1；
S103, rainfall spray head is opened, holding rainfall is C1, the breakdown voltage of 10 sub-electrodes is measured using uniform boosting method, and
10 breakdown voltages are averaging, so that measuring the breakdown voltage under d1 clearance distance and C1 rainfall is Uc；
S104, the 10g grains of sand are added in cabinet, open blower, wind speed is maintained at 12m/s, closes blower after keeping setting time；
S105, laser dust monitor is opened, when floating dust concentration is in a1~a2, pressurize 0.9Uc on the electrode；
S106, rainfall spray head is opened, if gap breakdown, repeatedly S104 process, when floating dust concentration is in a1~a2, electrode
Upper voltage reduces 0.02Ub；If gap does not puncture, repeatedly S104 process, when floating dust concentration is in a1~a2, on electrode
Voltage increases 0.02Ub；It is Ud to obtain minimum disruptive voltage when final floating dust concentration is in a1-a2；
S107, calculate floating dust concentration and be in a1~a2, clearance distance be d1 and rainfall be C1 condition to gap breakdown voltage most
Big change rate δ=(Ub-Ud)/Ub；
S108, change rainfall, floating dust concentration range and clearance distance, repeat above-mentioned S101 to S107 step, to obtain not
Breakdown voltage maximum rate of change under the conditions of.
2. test method according to claim 1, which is characterized in that adjacent pressurization interval twice in the uniform boosting method
For 1min.
3. test method according to claim 1, which is characterized in that setting time is 5min in the step S104.
4. a kind of research using test method as claimed in any one of claims 1-3 drifts along day rainfall to electrode breakdown potential
Press the experimental rig influenced, which is characterized in that including rain test case and hookup, the rain test case includes, cabinet,
Rainfall spray head, support insulator and electrode support, the rainfall spray head are located at the top of cabinet, and the support insulator is fixed on
The bottom of cabinet, the electrode support are fixed on support insulator；
The hookup includes pressure regulator B, transformer T, protective resistance R and capacitive divider F, the output of the pressure regulator B
End is electrically connected with the input terminal of transformer T, and the series circuit of the protective resistance R and capacitive divider F composition is connected electrically in change
Between two output ends of depressor T, the high-voltage end electricity of the node stated between protective resistance R and capacitive divider F and cabinet
Connection, between the transformer T and capacitive divider F node ground connection, and the bottom of cabinet be electrically connected.
The experimental rig that day rainfall influences electrode breakdown voltage 5. research according to claim 4 is drifted along, feature exist
In the rainfall spray head is four, and four rainfall spray heads are symmetrical centered on high-voltage end.
The experimental rig that day rainfall influences electrode breakdown voltage 6. research according to claim 5 is drifted along, feature exist
In the rainfall spray head is 0.4m at a distance from high-voltage end.
The experimental rig that day rainfall influences electrode breakdown voltage 7. research according to claim 5 or 6 is drifted along, feature
It is, each rainfall spray head can be switched individually, to be used to simulate different rainfalls.
The experimental rig that day rainfall influences electrode breakdown voltage 8. research according to claim 7 is drifted along, feature exist
In also setting up humiture atmospheric pressure table in cabinet.
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| CN107064762B (en) * | 2017-05-26 | 2023-07-04 | 国网河南省电力公司电力科学研究院 | Ultra-high voltage transmission line air gap rain flash test device and method |
| CN109374683B (en) * | 2018-08-24 | 2021-01-12 | 中国南方电网有限责任公司超高压输电公司广州局 | Cooling water pipe damage simulation test device and method for voltage-sharing electrode wire |
| CN112002501B (en) * | 2020-06-29 | 2023-03-14 | 中国电力科学研究院有限公司 | Device for preventing outdoor insulator from raining flashover and verification method |
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Non-Patent Citations (1)
| Title |
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| 《棒一板短空气间隙淋雨交流放电特性及电压校正》;蒋兴良 等;《电工技术学报》;20121231;第27卷(第12期);第36-39页 |
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