CN113533911A - Experimental device and testing method for high-voltage bushing insulation test and temperature detection - Google Patents
Experimental device and testing method for high-voltage bushing insulation test and temperature detection Download PDFInfo
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- CN113533911A CN113533911A CN202110653826.8A CN202110653826A CN113533911A CN 113533911 A CN113533911 A CN 113533911A CN 202110653826 A CN202110653826 A CN 202110653826A CN 113533911 A CN113533911 A CN 113533911A
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- 238000012360 testing method Methods 0.000 title claims abstract description 105
- 238000009413 insulation Methods 0.000 title claims abstract description 102
- 238000001514 detection method Methods 0.000 title claims abstract description 30
- 230000007246 mechanism Effects 0.000 claims abstract description 16
- 238000010998 test method Methods 0.000 claims abstract description 4
- 238000009529 body temperature measurement Methods 0.000 claims description 24
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- 239000004020 conductor Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 239000002828 fuel tank Substances 0.000 description 1
- 239000003292 glue Substances 0.000 description 1
- 230000017525 heat dissipation Effects 0.000 description 1
- 230000020169 heat generation Effects 0.000 description 1
- 238000001453 impedance spectrum Methods 0.000 description 1
- 239000012212 insulator Substances 0.000 description 1
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- 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
- G01R31/1227—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 of components, parts or materials
- G01R31/1263—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 of components, parts or materials of solid or fluid materials, e.g. insulation films, bulk material; of semiconductors or LV electronic components or parts; of cable, line or wire insulation
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Abstract
The invention relates to an experimental device and a testing method for insulation test and temperature detection of a high-voltage bushing, belonging to the technical field of power equipment detection, wherein the experimental device comprises: the oil tank assembly is internally provided with oil, the connecting mechanism is arranged between the first high-voltage sleeve and the second high-voltage sleeve, the bottom ends of the first high-voltage sleeve and the second high-voltage sleeve are inserted into the oil tank assembly, the first high-voltage sleeve is connected with the temperature measuring assembly, and the second high-voltage sleeve is connected with the insulating property measuring assembly; the temperature measuring assembly is used for measuring and recording the temperature inside the first high-voltage bushing; the insulation performance measuring assembly is used for measuring the insulation characteristic of the second high-voltage bushing; the test method comprises the following steps: temperature measurement-insulation characteristic measurement-repeated temperature measurement-repeated insulation characteristic measurement-repeated next current point test; so set up, can obtain the rule of generating heat and conducting heat and the influence rule of thermal effect to high-tension bushing insulating property under the running state simultaneously.
Description
Technical Field
The invention relates to the technical field of test and detection of electrical equipment, in particular to an experimental device and a test method for insulation test and temperature detection of a high-voltage bushing.
Background
At present, high-voltage bushings are used for leading current-carrying conductors into or out of metal boxes or valve hall walls of equipment with different potentials in power transmission and transformation projects, and the high-voltage bushings are used for leading in or leading out full voltage and full current and playing insulating and supporting roles. In terms of electrical stress, high voltage bushings are subjected to radial and axial field strengths; in the aspect of operation temperature, the current-carrying heating and the dielectric loss heating of the high-voltage bushing can further improve the operation temperature of the high-voltage bushing, and the operation conditions are extremely harsh. The reliability of the high-voltage bushing operation is directly related to the operation safety of a large power grid, and the high-voltage bushing is one of key devices for ensuring the safe and stable operation of a power system.
Due to the fact that the high-voltage bushing fails due to heating, the converter station is forced to stop repairing, and economic loss is huge. The operational reliability of a high voltage bushing depends to a large extent on its insulating properties, which are closely related to the heat generation and dissipation inside the high voltage bushing.
However, the conventional test method has a rule of measuring the change of the insulation performance under the action of load, or a temperature measuring point is arranged to monitor the change of the internal temperature of the high-voltage bushing in real time during temperature rise test, and when the two methods are operated singly, the rule of influence of the thermal effect on the insulation performance cannot be reflected quantitatively.
Disclosure of Invention
Aiming at the defects in the prior art, the invention aims to provide an experimental device and a testing method for high-voltage bushing insulation testing and temperature detection.
The above object of the present invention is achieved by the following technical solutions: in one aspect, the invention provides an experimental device for insulation test and temperature detection of a high-voltage bushing, which comprises a high-voltage bushing assembly, an oil tank assembly, a temperature measuring assembly and an insulation performance measuring assembly; oil is contained in the oil tank assembly, the bottom end of the high-voltage sleeve assembly is inserted into the oil tank assembly and is immersed into the oil, and the oil is used for providing an insulating environment for the high-voltage sleeve assembly; the high-voltage bushing assembly comprises a first high-voltage bushing, a second high-voltage bushing opposite to the first high-voltage bushing and a connecting mechanism, the connecting mechanism is arranged between the first high-voltage bushing and the second high-voltage bushing, the bottom ends of the first high-voltage bushing and the second high-voltage bushing are inserted into the oil tank assembly, the first high-voltage bushing is connected with the temperature measuring assembly, and the second high-voltage bushing is connected with the insulating property measuring assembly; the temperature measuring assembly is used for measuring and recording the temperature inside the first high-voltage bushing; the insulation performance measuring assembly is used for measuring the insulation characteristic of the second high-voltage bushing.
Preferably, the connection mechanism includes a first connection assembly and a second connection assembly, the first connection assembly and the second connection assembly are oppositely disposed, the top ends of the first high-voltage bushing and the second high-voltage bushing are connected through the first connection assembly, the bottom ends of the first high-voltage bushing and the second high-voltage bushing are connected through the second connection assembly, the second connection assembly is accommodated in the oil tank assembly, the first high-voltage bushing, the second high-voltage bushing, the first connection assembly and the second connection assembly together enclose a test loop, and the first connection assembly and the second connection assembly are used for controlling the test loop to be closed and opened.
Preferably, the experimental device for insulation test and temperature detection of a high-voltage bushing provided by the invention comprises a shell, a first lifting seat and a second lifting seat; the casing encloses and establishes into and holds the chamber, the fluid holding is in hold the intracavity, first rising seat with the second rises the seat interval and sets up the top of casing, the cover is equipped with and rises the current ware on the first rising seat, the inner wall that rises the current ware with the distance is predetermine to the outer wall interval of first rising seat, the bottom that rises the current ware is supported the top of casing, it is used for doing to rise the current ware the experimental return circuit provides the electric current.
Preferably, in the experimental apparatus for insulation test and temperature detection of a high-voltage bushing provided by the present invention, a first flange is sleeved on the first high-voltage bushing, a second flange is sleeved on the second high-voltage bushing, the bottom end of the first high-voltage bushing is inserted into the accommodating cavity through the first raising seat, and the bottom end of the first flange abuts against the top end of the first raising seat; the bottom end of the second high-voltage bushing is inserted into the accommodating cavity through the second lifting seat, and the bottom end of the second flange is abutted to the top end of the second lifting seat.
Preferably, in the experimental apparatus for insulation test and temperature detection of a high-voltage bushing, a current transformer is sleeved on the second high-voltage bushing, the current transformer is located at the bottom end of the second flange, the top end of the current transformer is connected with the bottom end of the second flange, and the current transformer is inserted into the second lifting seat; the current transformer is used for measuring the current of the test loop.
Preferably, the experimental apparatus for insulation test and temperature detection of a high voltage bushing provided by the present invention, the temperature measuring assembly includes a measuring wire and a recorder, one end of the measuring wire is connected to the recorder, and the other end of the measuring wire is connected to the first high voltage bushing.
Preferably, according to the experimental apparatus for testing insulation and detecting temperature of a high voltage bushing provided by the present invention, the insulation performance measuring assembly includes an insulation diagnostic instrument and a display device, one end of the insulation diagnostic instrument is connected to the second high voltage bushing by a wire, and the other end of the insulation diagnostic instrument is connected to the display device.
Preferably, in the experimental apparatus for insulation testing and temperature detection of a high-voltage bushing, the first connection assembly includes a first connection guide rod and a first switch, one end of the first connection guide rod is connected to the top end of the first high-voltage bushing, the other end of the first connection guide rod is connected to the top end of the second high-voltage bushing, the first switch is disposed on the first connection guide rod, and the first switch is configured to control opening and closing of the test loop.
Preferably, in the experimental apparatus for insulation test and temperature detection of a high-voltage bushing, the second connection assembly includes a second connection guide rod and a second switch, one end of the second connection guide rod is connected to the bottom end of the first high-voltage bushing, the other end of the second connection guide rod is connected to the bottom end of the second high-voltage bushing, the second switch is disposed on the second connection guide rod, and the second switch is configured to control opening and closing of the test loop.
In another aspect, in the testing method provided by the present invention, with the experimental apparatus, a plurality of temperature measurement points are disposed on the first high-voltage bushing, and the testing method includes the following steps:
temperature measurement: the test loop is closed, the current booster provides current for the test loop, and the temperature measuring component measures and records the temperature of the temperature measuring point;
an insulation characteristic measurement step: the current is reduced to zero, the test loop is disconnected, the insulating property measuring assembly applies voltage to the second high-voltage bushing to measure the insulating property of the second high-voltage bushing, the test loop is closed after the measurement is finished, and the current booster raises the current of the test loop to a set value;
repeating the temperature measuring step: the temperature measuring component continues to measure and record the temperature of the temperature measuring point until the temperature of the temperature measuring point reaches a stable value;
repeating the insulation characteristic measuring step: repeatedly measuring the insulation characteristic of the second high voltage bushing at intervals of a predicted time length until the insulation characteristic of the second high voltage bushing reaches a stable value.
Measuring the next current point: the first high voltage bushing and the second high voltage bushing are naturally cooled to ambient temperature, and the temperature measurement of the next current point and the insulation characteristic measurement of the second high voltage bushing are performed.
In conclusion, the beneficial technical effects of the invention are as follows: according to the experimental device and the testing method for the insulation test and the temperature detection of the high-voltage bushing, in the test process, the experimental device comprises a high-voltage bushing assembly, an oil tank assembly, a temperature measuring assembly and an insulation performance measuring assembly; the oil tank assembly is internally provided with oil, the bottom end of the high-voltage sleeve assembly is inserted into the oil tank assembly and is immersed into the oil, and the oil is used for providing an insulating environment for the high-voltage sleeve assembly; the high-voltage bushing assembly comprises a first high-voltage bushing, a second high-voltage bushing opposite to the first high-voltage bushing and a connecting mechanism, the connecting mechanism is arranged between the first high-voltage bushing and the second high-voltage bushing, the bottom ends of the first high-voltage bushing and the second high-voltage bushing are inserted into the oil tank assembly, the first high-voltage bushing is connected with the temperature measuring assembly, and the second high-voltage bushing is connected with the insulating property measuring assembly; the temperature measuring assembly is used for measuring and recording the temperature inside the first high-voltage bushing; the insulation performance measuring assembly is used for measuring the insulation characteristic of the second high-voltage bushing; the test flow is as follows: temperature measurement-insulation characteristic measurement-repeated temperature measurement-repeated insulation characteristic measurement-repeated next current point test; so set up, can obtain the rule of generating heat and conducting heat and the influence rule of thermal effect to high-tension bushing insulating property under the running state simultaneously.
Drawings
Fig. 1 is a schematic overall structure diagram of an experimental apparatus for insulation test and temperature detection of a high voltage bushing according to an embodiment of the present invention.
Fig. 2 is a schematic structural diagram of a first high voltage bushing and a temperature measurement assembly in an experimental apparatus for insulation test and temperature detection of a high voltage bushing according to an embodiment of the present invention.
Fig. 3 is a schematic structural diagram of a second high voltage bushing and an insulation performance measuring assembly in an experimental apparatus for insulation test and temperature detection of a high voltage bushing according to an embodiment of the present invention.
Fig. 4 is a flowchart of a testing method according to another embodiment of the present invention.
In the figure, 1, experimental apparatus; 10. a high pressure bushing assembly; 101. a first high voltage bushing; 1011. a first flange; 102. a second high voltage bushing; 1021. a second flange; 103. a first connection assembly; 1031. a first connecting guide rod; 1032. a first switch; 104. a second connection assembly; 1041. a second connecting guide rod; 1042. a second switch; 20. a fuel tank assembly; 201. a housing; 2011. an accommodating chamber; 202. a first elevation base; 203. a second elevation base; 204. a current riser; 205. a current transformer; 30. a temperature measurement component; 301. measuring a line; 302. a recorder; 40. an insulation performance measuring component; 401. an insulation diagnostic instrument; 402. a display device.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings.
Referring to fig. 1, an experimental apparatus 1 for insulation test and temperature detection of a high voltage bushing disclosed by the present invention includes a high voltage bushing assembly 10, an oil tank assembly 20, a temperature measuring assembly 30, and an insulation performance measuring assembly 40; oil is contained in the oil tank assembly 20, the bottom end of the high-voltage bushing assembly 10 is inserted into the oil tank assembly 20 and is immersed in the oil, and the oil is used for providing an insulating environment for the high-voltage bushing assembly 10; the oil tank assembly 20 is used for simulating an actual operation environment, so that the accuracy of the results of the insulation characteristic detection and the temperature detection of the high-voltage bushing by the experimental device 1 is improved.
In this embodiment, the high voltage bushing assembly 10 includes a first high voltage bushing 101, a second high voltage bushing 102 disposed opposite to the first high voltage bushing 101, and a connecting mechanism, where the connecting mechanism is disposed between the first high voltage bushing 101 and the second high voltage bushing 102, bottom ends of the first high voltage bushing 101 and the second high voltage bushing 102 are inserted into the oil tank assembly 20, the first high voltage bushing 101 is connected to the temperature measuring assembly 30, and the second high voltage bushing 102 is connected to the insulation performance measuring assembly 40; the temperature measuring assembly 30 is used for measuring and recording the temperature inside the first high voltage bushing 101; the insulation performance measuring assembly 40 is used for measuring the insulation characteristics of the second high voltage bushing 102; through setting up temperature measurement subassembly and insulating properties measurement subassembly, can obtain the rule of generating heat and conducting heat and the influence rule of thermal effect to high-voltage bushing insulating properties under the running state of high-voltage bushing simultaneously in the experiment.
Specifically, a first high voltage bushing 101 and a second high voltage bushing 102 are arranged at an interval, one side of the connection mechanism is connected with the first high voltage bushing 101, and the other side of the connection mechanism is connected with the second high voltage bushing 102.
Further, in this embodiment, the connection mechanism includes a first connection component 103 and a second connection component 104, the first connection component 103 and the second connection component 104 are disposed oppositely, the top ends of the first high voltage bushing 101 and the second high voltage bushing 102 are connected through the first connection component 103, the bottom ends of the first high voltage bushing 101 and the second high voltage bushing 102 are connected through the second connection component 104, the second connection component 104 is accommodated in the oil tank component 20, the first high voltage bushing 101, the second high voltage bushing 102, the first connection component 103 and the second connection component 104 enclose a test loop, and the first connection component 103 and the second connection component 104 are used for controlling the test loop to be closed and opened.
Specifically, the axis of first high-voltage bushing 101 and the axis parallel arrangement of second high-voltage bushing 101, the one end of first connecting assembly 103 can be dismantled with first high-voltage bushing 101's top and be connected, the other end of first connecting assembly 103 can be dismantled with second high-voltage bushing 102's top and be connected, second connecting assembly 104 holding is in oil tank subassembly 20, the one end of second connecting assembly 104 can be dismantled with first high-voltage bushing 101's bottom and be connected, the other end of second connecting assembly 104 can be dismantled with second high-voltage bushing 102's bottom and be connected. Wherein, when measuring the temperature, the test loop is in a closed state; when the insulation characteristic measurement is performed, the circuit is in an open state.
With continued reference to fig. 1 to 3, in the present embodiment, a temperature measuring assembly 30 is connected to the first high voltage bushing 101, the temperature measuring assembly 30 being configured to measure and record a temperature inside the first high voltage bushing 101; the insulation performance measuring assembly 40 is connected with the second high voltage bushing 102, and the insulation performance measuring assembly 40 is used for measuring the insulation characteristic of the second high voltage bushing 102; by arranging the temperature measuring assembly 30 and the insulating property measuring assembly 40, the internal temperature change of the first high-voltage bushing 101 in the temperature rise process can be measured in the experimental process; meanwhile, when the internal temperature of the first high-voltage bushing 101 is monitored, the change rule of the insulation characteristic of the second high-voltage bushing 102 is measured, so that the influence rule of internal heating, heat transfer rule and thermal effect action of the high-voltage bushing on the insulation performance of the high-voltage bushing in the operation process is mastered.
Further, in the present embodiment, the tank assembly 20 includes a housing 201, a first elevated seat 202, and a second elevated seat 203; casing 201 encloses and establishes into and hold the chamber 2011, and the fluid holding is in holding chamber 2011, and first rising seat 202 and second rise seat 203 interval set up on the top of casing 201, and the cover is equipped with and rises a ware 204 on the first rising seat 202, rises the inner wall of ware 204 and the outer wall interval of first rising seat 202 and predetermines the distance, rises the top of ware 204 and supports the top at casing 201, rises a ware 204 and is used for providing the electric current for the test return circuit.
Specifically, the bottom end of the first elevation seat 202 abuts against the top end of the housing 201, and the bottom end of the second elevation seat 203 abuts against the top end of the housing 201. The first elevated seat 202 is disposed corresponding to the first high voltage bushing 101, the second elevated seat 203 is disposed corresponding to the second high voltage bushing 102, and the first elevated seat 202 and the second elevated seat 203 respectively support and fix the first high voltage bushing 101 and the second high voltage bushing 102.
To simulate the actual operating environment of the first and second high voltage bushings 101, 102, oil is contained within the housing 2011 and the temperature of the oil is heated to a temperature greater than ambient temperature (60 ± 2) degrees celsius, the oil providing an insulating environment for the high voltage bushing assembly 10.
For example, the current riser 204 may be a feedthrough current riser, but the current riser 204 may take other forms as long as it can provide current to the test loop. In an implementation manner that the current riser 204 is a through current riser, the current riser 204 is sleeved on the first lifting base 202, an inner wall of the current riser 204 is spaced from an outer wall of the first lifting base 202 by a predetermined distance, the current riser 204 is connected to an external voltage regulator, and the voltage regulator is used for providing an input power supply for the current riser 204.
With reference to fig. 1, in this embodiment, a first flange 1011 is sleeved on the first high voltage bushing 101, a second flange 1021 is sleeved on the second high voltage bushing 102, the bottom end of the first high voltage bushing 101 is inserted into the accommodating cavity 2011 through the first lifting seat 202, and the bottom end of the first flange 1011 abuts against the top end of the first lifting seat 202; the bottom end of the second high-voltage bushing 102 is inserted into the accommodating cavity 2011 through the second raised seat 203, and the bottom end of the second flange 1021 abuts against the top end of the second raised seat 203.
Specifically, the bottom end of the first high-voltage bushing 101 is inserted into the accommodating cavity 2011 through the first lifting seat 202 and is immersed in the oil liquid; the bottom end of second high-pressure bushing 102 is inserted into receiving cavity 2011 through second raised seat 203 and is immersed in the oil.
Further, in this embodiment, the second high voltage bushing 102 is sleeved with the current transformer 205, the current transformer 205 is located at the bottom end of the second flange 1021, the top end of the current transformer 205 is connected with the bottom end of the second flange 1021, and the current transformer 205 is inserted into the second lifting seat 203; the current transformer 205 is used to measure the current of the test loop.
Specifically, the current transformer 205 is inserted into the second elevated seat 203, and the current transformer 205 is sleeved on the second high voltage bushing 102, so that the current transformer 205 is convenient to measure the current in the test loop.
With continued reference to fig. 2, in the present embodiment, the temperature measuring assembly 30 comprises a measuring wire 301 and a recorder 302, one end of the measuring wire 301 is connected to the recorder 302, and the other end of the measuring wire 301 is connected to the first high voltage bushing 101.
Specifically, the first high-voltage bushing 101 is provided with a plurality of temperature measuring holes, the temperature measuring holes are formed in the temperature measuring points, one end of the measuring wire 301 is embedded in the temperature measuring hole to be measured, and the measuring wire 301 is used for measuring the temperature of the temperature measuring points.
For example, the measuring line 301 may be a T-type thermocouple wire, and of course, the measuring line 301 may also be a K-type thermocouple wire or an E-type thermocouple wire. In an implementation manner that the temperature measuring line 301 adopts a T-type thermocouple wire, the optimal temperature measuring range of the T-type thermocouple wire is 0-150 ℃.
With continued reference to fig. 3, in the present embodiment, the insulation performance measuring assembly 40 includes an insulation diagnostic apparatus 401 and a display device 402, one end of the insulation diagnostic apparatus 401 is connected to the second high voltage bushing 102 by wire, and the other end of the insulation diagnostic apparatus 401 is connected to the display device 402; the insulation diagnostic instrument 401 is used to measure the insulation characteristics of the second high voltage bushing 102.
With reference to fig. 1, in the present embodiment, the first connection assembly 103 includes a first connection bar 1031 and a first switch 1032, one end of the first connection bar 1031 is connected to the top end of the first high voltage bushing 101, the other end of the first connection bar 1031 is connected to the top end of the second high voltage bushing 102, the first switch 1032 is disposed on the first connection bar 1031, and the first switch 1032 is used for controlling the opening and closing of the test loop.
With reference to fig. 1, in this embodiment, the second connection assembly 104 includes a second connection rod 1041 and a second switch 1042, one end of the second connection rod 1041 is connected to the bottom end of the first high voltage bushing 101, the other end of the second connection rod 1041 is connected to the bottom end of the second high voltage bushing 102, the second switch 1042 is disposed on the second connection rod 1041, and the second switch 1042 is configured to control opening and closing of the test loop.
Specifically, when the first switch 1032 and the second switch 1042 are both closed, the test loop is in a closed state, and when the first switch 1032 and the second switch 1042 are both opened, the test loop is in an open state.
With continued reference to fig. 4, another embodiment provides a testing method, using the experimental apparatus 1 described above, where a plurality of temperature measurement points are disposed on the first high-voltage bushing 101, and the testing method includes the following steps:
temperature measurement: the test loop is closed, the current booster 204 provides current to the test loop, and the temperature measurement assembly 30 measures and records the temperature inside the temperature measurement point.
In order to comprehensively master the internal heating and heat transfer law of the high-voltage bushing, the first high-voltage bushing 101 and the second high-voltage bushing 102 both use the converter transformer valve side glue impregnated paper bushings of the same material and the same size.
Specifically, the current value provided by the current booster for the test loop is a specified current value.
Further, in this embodiment, before the temperature measuring step, the oil is heated so that the temperature of the oil is 60 ± 2 ℃ higher than the ambient temperature. Before the start of the test, both the first high voltage bushing 101 and the second high voltage bushing 102 are filled with SF at the lowest operating pressure6Gas, note that SF was used before the start of the test6The gas needs to be at ambient temperature.
Specifically, the shell 201 is connected with an external oil filter, and oil in the shell 201 is heated by the oil filter and circulates, so that the oil is maintained within a range of 60 ± 2 ℃ higher than the ambient temperature.
The test loop is closed, the voltage regulator provides input power for the current booster 204, the current booster 204 provides required current for the test loop, and the current of the test loop is measured through the current transformer 205. At this time, the temperature inside the first high voltage bushing 101 is measured through the measurement line 301, and the recorder 302 records the measured temperature.
The connection portion between the current-carrying conduit of the first high-voltage bushing 101 and the external cable generates a large amount of heat due to the presence of contact resistance, and the connection portion needs to be polished smooth and coated with a conductive paste to reduce the contact resistance.
Specifically, a plurality of temperature measurement points are provided on the current-carrying conduit, the connection terminal, the core surface, the inside, and the like of the first high-voltage bushing 101.
Illustratively, 64 temperature measurement points are provided, wherein 1 to 24 temperature measurement points are used for measuring the temperature of the current-carrying conduit, and 24 temperature measurement points are arranged along the peripheral wall of the current-carrying conduit; the temperature measuring points 25 to 26 are used for measuring the temperature of the wiring terminal at the bottom end of the first high-voltage bushing 101; the temperature measuring point of 27 is used for measuring the temperature of the oil liquid; 28-54 are used for measuring the temperature of the surface and the interior of the core body; the temperature measurement points 55 to 56 are used for measuring the SF of the tip of the first high voltage bushing 1016The temperature of the gas; the temperature measurement points 57 to 60 are used for measuring the temperature of the exterior of the hollow composite insulator of the first high voltage bushing 101; the temperature measuring points 61 to 62 are used for measuring the temperature of the wiring terminal at the top end of the first high-voltage bushing 101; the temperature measuring points 63 to 64 are used to measure the temperature of the surroundings.
A temperature measuring hole is formed at the temperature measuring point, one end of the measuring wire 301 is embedded in the temperature measuring hole, scraps generated when the temperature measuring hole is formed are filled in the temperature measuring hole, and the measuring wire 301 is fixed through an insulating adhesive tape.
Illustratively, the current risers 204 apply 2500A, 4000A, 5000A currents to the test loops, respectively, and when the current risers 204 apply 2500A currents, the temperature rise process of each temperature measurement point in the first high voltage bushing 101 is measured through the measurement lines 301.
An insulation characteristic measurement step: when the current is reduced to zero, the test loop is opened, the insulation performance measuring assembly 40 applies voltage to the second high-voltage bushing 102 to measure the insulation characteristic of the second high-voltage bushing 102, the test loop is closed immediately after the measurement is finished, and the current of the test loop is increased to a set value by the current increaser 204.
Wherein the current of the test loop is reduced to zero by the current booster 204 prior to the insulation characteristic test. In order to prevent the applied test voltage from affecting the measurement line 301, the test loop needs to be opened, i.e. the first switch 1032 and the second switch 1042 are opened.
The insulation diagnostic apparatus 401 applies a voltage of 200V to the second high voltage bushing 102 to perform FDS insulation characteristic measurement and PDC test; it should be noted that the FDS insulation characteristic measurement includes dielectric loss factor, capacitance, and frequency domain dielectric spectrum; PDC tests include absorption ratio, polarization/depolarization current.
Specifically, after the insulation characteristic measurement is completed, the first switch 1032 and the second switch 1042 are closed, at this time, the test loop is closed, and the current of the test loop is increased to a set value by the current booster 204.
Repeating the temperature measuring step: the temperature measurement assembly 30 continues to measure and record the temperature of the temperature measurement point until the temperature of the temperature measurement point reaches a stable value.
The temperature of the temperature measuring point is continuously measured by the measuring line 301 until the temperature reaches a stable value, and the steady-state temperature of the temperature measuring point is recorded by the recorder 302. It should be noted that according to the IEC 60137 standard, the temperature stability criterion is that the temperature rise change is not more than 1K within 1 h. According to a temperature rise test stability criterion specified by a DL/T4109 standard, the variation delta tan delta of the dielectric loss factor per hour is less than or equal to 0.02 percent and is used as a temperature rise test stability basis.
Repeating the insulation characteristic measuring step: the measurement of the insulation characteristic of the second high voltage bushing 102 is repeated every predetermined time period until the insulation characteristic of the second high voltage bushing 102 reaches a stable value.
Illustratively, the insulation characteristics of the second high voltage bushing 102 are repeatedly measured when the expected time period is equal to 1 hour. Of course, the estimated time period may be greater than 1 hour, and the estimated time period may be less than 1 hour.
Measuring the next current point: the first high voltage bushing 101 and the second high voltage bushing 102 are naturally cooled to ambient temperature, the temperature measurement is performed for the next current point and the insulation characteristic measurement is performed for the second high voltage bushing 102.
Wherein the current point is a specified current value applied to the test loop.
Specifically, after the insulation characteristic and the temperature measurement of the previous current point reach a stable value, in order to prevent the heat accumulation effect in the first high-voltage bushing 101 after the temperature test, the first high-voltage bushing 101 and the second high-voltage bushing 102 are naturally cooled to the ambient temperature after the temperature test is completed each time, and then the next current point test is started.
In the testing method provided by this embodiment, in the testing process, the experimental apparatus 1 is adopted; the experimental device 1 comprises a high-voltage bushing assembly 10, an oil tank assembly 20, a temperature measuring assembly 30 and an insulation performance measuring assembly 40; oil liquid is contained in the oil tank assembly 20, the bottom end of the high-voltage bushing assembly 10 is inserted into the oil tank assembly 20 and is immersed into the oil changing liquid, and the oil liquid is used for providing an insulating environment for the high-voltage bushing assembly 10; the high-voltage bushing assembly 10 comprises a first high-voltage bushing 101, a second high-voltage bushing 102 and a connecting mechanism, wherein the second high-voltage bushing 102 is arranged opposite to the first high-voltage bushing 101, the connecting mechanism is arranged between the first high-voltage bushing 101 and the second high-voltage bushing 102, the bottom ends of the first high-voltage bushing 101 and the second high-voltage bushing 102 are inserted into the oil tank assembly 20, the first high-voltage bushing 101 is connected with the temperature measuring assembly 30, and the second high-voltage bushing 102 is connected with the insulating property measuring assembly 40; the temperature measuring assembly 30 is used for measuring and recording the temperature inside the first high voltage bushing 101; the insulation performance measuring assembly 40 is used for measuring the insulation characteristics of the second high voltage bushing 102; the test flow is as follows: temperature measurement-insulation characteristic measurement-repeated temperature measurement-repeated insulation characteristic measurement-repeated next current point test; so set up, can obtain the rule of generating heat and conducting heat and the influence rule of thermal effect to high-tension bushing insulating property under the running state simultaneously.
It is noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.
Finally, it should be noted that: it should be understood that the above examples are only for clearly illustrating the present invention and are not intended to limit the embodiments. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. And obvious variations or modifications of the invention may be made without departing from the scope of the invention.
Claims (10)
1. The utility model provides an experimental apparatus for be used for high-voltage bushing insulation test and temperature detection which characterized in that: the high-voltage bushing component is connected with the oil tank component through a high-voltage bushing component;
oil is contained in the oil tank assembly, the bottom end of the high-voltage sleeve assembly is inserted into the oil tank assembly and is immersed into the oil, and the oil is used for providing an insulating environment for the high-voltage sleeve assembly;
the high-voltage bushing assembly comprises a first high-voltage bushing, a second high-voltage bushing opposite to the first high-voltage bushing and a connecting mechanism, the connecting mechanism is arranged between the first high-voltage bushing and the second high-voltage bushing, the bottom ends of the first high-voltage bushing and the second high-voltage bushing are inserted into the oil tank assembly, the first high-voltage bushing is connected with the temperature measuring assembly, and the second high-voltage bushing is connected with the insulating property measuring assembly;
the temperature measuring assembly is used for measuring and recording the temperature inside the first high-voltage bushing;
the insulation performance measuring assembly is used for measuring the insulation characteristic of the second high-voltage bushing.
2. Experimental setup for high voltage bushing insulation testing and temperature detection according to claim 1, characterized in that: the connecting mechanism comprises a first connecting assembly and a second connecting assembly, the first connecting assembly and the second connecting assembly are arranged relatively, the first high-voltage bushing and the top end of the second high-voltage bushing are connected through the first connecting assembly, the first high-voltage bushing and the bottom end of the second high-voltage bushing are connected through the second connecting assembly, the second connecting assembly is accommodated in the oil tank assembly, the first high-voltage bushing and the second high-voltage bushing and the first connecting assembly and the second connecting assembly jointly enclose and form a test loop, and the first connecting assembly and the second connecting assembly are used for controlling the closing and the breaking of the test loop.
3. Experimental setup for high voltage bushing insulation testing and temperature detection according to claim 1, characterized in that: the oil tank assembly comprises a shell, a first lifting seat and a second lifting seat;
the casing encloses and establishes into and holds the chamber, the fluid holding is in hold the intracavity, first rising seat with the second rises the seat interval and sets up the top of casing, the cover is equipped with and rises the current ware on the first rising seat, the inner wall that rises the current ware with the distance is predetermine to the outer wall interval of first rising seat, the bottom that rises the current ware is supported the top of casing, it is used for doing to rise the current ware the experimental return circuit provides the electric current.
4. Experimental setup for high voltage bushing insulation testing and temperature detection according to claim 3, characterized in that: the first high-voltage bushing is sleeved with a first flange, the second high-voltage bushing is sleeved with a second flange, the bottom end of the first high-voltage bushing is inserted into the accommodating cavity through the first lifting seat, and the bottom end of the first flange is abutted to the top end of the first lifting seat;
the bottom end of the second high-voltage bushing is inserted into the accommodating cavity through the second lifting seat, and the bottom end of the second flange is abutted to the top end of the second lifting seat.
5. Experimental setup for high voltage bushing insulation testing and temperature detection according to claim 4, characterized in that: a current transformer is sleeved on the second high-voltage sleeve and is positioned at the bottom end of the second flange, the top end of the current transformer is connected with the bottom end of the second flange, and the current transformer is inserted in the second lifting seat;
the current transformer is used for measuring the current of the test loop.
6. An experimental setup for high voltage bushing insulation performance testing and temperature detection according to claim 1, characterized in that: the temperature measuring assembly comprises a measuring wire and a recorder, one end of the measuring wire is connected with the recorder, and the other end of the measuring wire is connected with the first high-voltage bushing.
7. Experimental setup for high voltage bushing insulation testing and temperature detection according to claim 1, characterized in that: the insulation performance measuring assembly comprises an insulation diagnostic instrument and display equipment, one end of the insulation diagnostic instrument is in wired connection with the second high-voltage bushing, and the other end of the insulation diagnostic instrument is connected with the display equipment.
8. Experimental setup for high voltage bushing insulation testing and temperature detection according to claim 2, characterized in that: the first connecting assembly comprises a first connecting guide rod and a first switch, one end of the first connecting guide rod is connected with the top end of the first high-voltage sleeve, the other end of the first connecting guide rod is connected with the top end of the second high-voltage sleeve, the first switch is arranged on the first connecting guide rod, and the first switch is used for controlling the test loop to be opened and closed.
9. Experimental setup for high voltage bushing insulation testing and temperature detection according to claim 2, characterized in that: the second coupling assembling includes second connecting rod and second switch, the second connecting rod one end with first high-voltage bushing's bottom is connected, the second connecting rod the other end with second high-voltage bushing's bottom is connected, the second switch sets up on the second connecting rod, the second switch is used for control the disconnection and the closure of test circuit.
10. A test method using the assay device according to any one of claims 1 to 9, wherein: the first high-voltage bushing is provided with a plurality of temperature measuring points, and the testing method comprises the following steps:
temperature measurement: the test loop is closed, the current booster provides current for the test loop, and the temperature measuring component measures and records the temperature of the temperature measuring point;
an insulation characteristic measurement step: the current is reduced to zero, the test loop is disconnected, the insulation performance measuring assembly applies voltage to the second high-voltage bushing to measure the insulation characteristic of the second high-voltage bushing, the test loop is closed after the measurement is finished, and the current booster raises the current of the test loop to a set value;
repeating the temperature measuring step: the temperature measuring component continues to measure and record the temperature of the temperature measuring point until the temperature of the temperature measuring point reaches a stable value;
repeating the insulation characteristic measuring step: repeatedly measuring the insulation characteristic of the second high voltage bushing at intervals of a predicted time length until the insulation characteristic of the second high voltage bushing reaches a stable value.
Measuring the next current point: the first high voltage bushing and the second high voltage bushing are naturally cooled to ambient temperature, and the temperature measurement of the next current point and the insulation characteristic measurement of the second high voltage bushing are performed.
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