CN113533911B - Experimental device and method for high-voltage bushing insulation test and temperature detection - Google Patents
Experimental device and method for high-voltage bushing insulation test and temperature detection Download PDFInfo
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- CN113533911B CN113533911B CN202110653826.8A CN202110653826A CN113533911B CN 113533911 B CN113533911 B CN 113533911B CN 202110653826 A CN202110653826 A CN 202110653826A CN 113533911 B CN113533911 B CN 113533911B
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- 238000009413 insulation Methods 0.000 title claims abstract description 99
- 238000012360 testing method Methods 0.000 title claims abstract description 98
- 238000001514 detection method Methods 0.000 title claims abstract description 24
- 238000000034 method Methods 0.000 title description 15
- 230000007246 mechanism Effects 0.000 claims abstract description 14
- 238000010998 test method Methods 0.000 claims abstract description 6
- 238000005259 measurement Methods 0.000 claims description 32
- 238000009529 body temperature measurement Methods 0.000 claims description 26
- 238000001816 cooling Methods 0.000 claims description 2
- 239000007788 liquid Substances 0.000 claims 1
- 230000000694 effects Effects 0.000 abstract description 9
- 238000010438 heat treatment Methods 0.000 abstract description 7
- 238000012546 transfer Methods 0.000 abstract description 7
- 230000008569 process Effects 0.000 description 9
- 230000000630 rising effect Effects 0.000 description 8
- 230000008859 change Effects 0.000 description 6
- 230000009471 action Effects 0.000 description 4
- 230000003028 elevating effect Effects 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- 230000020169 heat generation Effects 0.000 description 3
- 239000012530 fluid Substances 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000010521 absorption reaction Methods 0.000 description 1
- 238000009825 accumulation Methods 0.000 description 1
- 239000002390 adhesive tape Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 239000004020 conductor Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 230000017525 heat dissipation Effects 0.000 description 1
- 238000001453 impedance spectrum Methods 0.000 description 1
- 239000012212 insulator Substances 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 230000028161 membrane depolarization Effects 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 230000000149 penetrating effect Effects 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 230000010287 polarization 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
- 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 sleeve, 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 respectively 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 sleeve; the insulation property measuring component is used for measuring the insulation property of the second high-voltage sleeve; the test method comprises the following steps: temperature measurement-insulation characteristic measurement-repetition of temperature measurement-repetition of insulation characteristic measurement-repetition of next current point test; by the arrangement, the heating and heat transfer rules of the high-voltage sleeve in the running state and the influence rules of the heat effect on the insulating performance of the high-voltage sleeve can be obtained at the same time.
Description
Technical Field
The invention relates to the technical field of electrical equipment test detection, in particular to an experimental device and a testing method for high-voltage bushing insulation test and temperature detection.
Background
At present, a high-voltage sleeve is used for leading a current-carrying conductor into or out of full voltage and full current by penetrating through a metal box body of equipment with different potential or a valve hall wall body in power transmission and transformation engineering, thereby playing an insulating and supporting role. In terms of electrical stress, the high-voltage bushing is subjected to radial and axial field strengths; in the aspect of operating temperature, the high-voltage bushing carries current to generate heat and the dielectric loss generates heat to further improve the operating temperature of the high-voltage bushing, and the operating condition is extremely harsh. The reliability of the operation of the high-voltage bushing is directly related to the operation safety of a large power grid, and the high-voltage bushing is one of key equipment for ensuring the safe and stable operation of a power system.
The high-voltage bushing is broken down due to heat generation, so that the converter station is forced to be stopped and repaired, and the economic loss is huge. The operational reliability of the high voltage bushing is largely dependent on its insulation properties, which are closely related to heat generation and heat dissipation inside the high voltage bushing.
However, the conventional test method has the rule of measuring the change of the insulation performance under the action of load, or the rule of quantitatively reflecting the influence of the thermal effect on the insulation performance when the two methods are operated singly by arranging temperature measuring points to monitor the temperature change in the high-voltage sleeve in real time during the temperature rise test.
Disclosure of Invention
Aiming at the defects existing in the prior art, the invention aims to provide an experimental device and a testing method for high-voltage bushing insulation test and temperature detection, and the experimental device and the testing method have the advantages that the heating and heat transfer rules of the high-voltage bushing in the running state and the influence rules of the heat effect on the insulation performance of the high-voltage bushing can be obtained simultaneously.
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 measurement assembly and an insulation performance measurement 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 immersed in the oil, and the oil is used for providing an insulating environment for the high-voltage sleeve assembly; the high-voltage sleeve assembly comprises a first high-voltage sleeve, a second high-voltage sleeve and a connecting mechanism, wherein the second high-voltage sleeve is arranged opposite to the first high-voltage sleeve, 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 sleeve; the insulation performance measurement assembly is used for conducting insulation characteristic measurement on the second high-voltage sleeve.
Preferably, the experimental device for insulation test and temperature detection of the high-voltage bushing provided by the invention comprises a first connecting component and a second connecting component, wherein the first connecting component and the second connecting component are oppositely arranged, the top ends of the first high-voltage bushing and the second high-voltage bushing are connected through the first connecting component, the bottom ends of the first high-voltage bushing and the second high-voltage bushing are connected through the second connecting component, the second connecting component is accommodated in the oil tank component, the first high-voltage bushing, the second high-voltage bushing, the first connecting component and the second connecting component are jointly enclosed to form a test loop, and the first connecting component and the second connecting component are used for controlling the closing and opening of the test loop.
Preferably, the invention provides an experimental device for insulation test and temperature detection of a high-voltage bushing, wherein the oil tank assembly comprises a shell, a first lifting seat and a second lifting seat; the shell encloses to be established into and holds the chamber, the fluid holding is in hold the intracavity, first rising seat with the interval of second rising seat sets up the top of shell, the cover is equipped with the current riser on the first rising seat, the inner wall of current riser with the outer wall interval of first rising seat is preset the distance, the bottom of current riser supports the top of shell, the current riser is used for the test circuit provides the electric current.
Preferably, in the experimental device for insulation test and temperature detection of a high-voltage bushing provided by the 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 lifting seat, and the bottom end of the first flange is abutted with the top end of the first lifting seat; the bottom end of the second high-voltage sleeve is inserted into the accommodating cavity through the second lifting seat, and the bottom end of the second flange is abutted with the top end of the second lifting seat.
Preferably, in the experimental device for insulation test and temperature detection of a high-voltage sleeve, a current transformer is sleeved on the second high-voltage sleeve, the current transformer 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.
Preferably, the experimental device for insulation test and temperature detection of the high-voltage bushing provided by the invention comprises a measuring line and a recorder, wherein one end of the measuring line is connected with the recorder, and the other end of the measuring line is connected with the first high-voltage bushing.
Preferably, the experimental device for insulation test and temperature detection of the high-voltage bushing provided by the invention comprises an insulation diagnostic instrument and a display device, wherein one end of the insulation diagnostic instrument is connected with the second high-voltage bushing in a wired manner, and the other end of the insulation diagnostic instrument is connected with the display device.
Preferably, 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 opening and closing of the test loop.
Preferably, the second connecting assembly comprises a second connecting guide rod and a second switch, one end of the second connecting guide rod is connected with the bottom end of the first high-voltage sleeve, the other end of the second connecting guide rod is connected with the bottom end of the second high-voltage sleeve, the second switch is arranged on the second connecting guide rod, and the second switch is used for controlling the opening and closing of the test loop.
On the other hand, the test method provided by the invention adopts the experimental device, a plurality of temperature measuring points are arranged on the first high-voltage sleeve, and the test method comprises the following steps:
a temperature measurement step: closing the test loop, providing current for the test loop by the current booster, and measuring and recording the temperature of the temperature measuring point by the temperature measuring assembly;
An insulation characteristic measurement step: the current is reduced to zero, the test loop is disconnected, the insulating property and insulation performance measuring assembly applies voltage to the second high-voltage sleeve to measure the insulation property of the second high-voltage sleeve, the test loop is closed after the measurement is finished, and the current of the test loop is increased to a set value by the current booster;
repeating the temperature measurement steps: 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: and repeatedly measuring the insulation characteristic of the second high-voltage bushing at intervals of expected time intervals until the insulation characteristic of the second high-voltage bushing reaches a stable value.
The next measuring step of current point: and naturally cooling the first high-voltage sleeve and the second high-voltage sleeve to the ambient temperature, and measuring the temperature of the next current point and the insulation characteristic of the second high-voltage sleeve.
In summary, the beneficial technical effects of the application are as follows: the application provides an experimental device and a testing method for insulation test and temperature detection of a high-voltage sleeve, wherein in the process of the test, the experimental device comprises a high-voltage sleeve component, an oil tank component, a temperature measuring component and an insulation performance measuring component; 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 immersed in the oil, and the oil is used for providing an insulating environment for the high-voltage sleeve assembly; the high-voltage sleeve assembly comprises a first high-voltage sleeve, a second high-voltage sleeve and a connecting mechanism, wherein the second high-voltage sleeve is arranged opposite to the first high-voltage sleeve, 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 sleeve; the insulation property measuring component is used for measuring the insulation property of the second high-voltage sleeve; the test flow is as follows: temperature measurement-insulation characteristic measurement-repetition of temperature measurement-repetition of insulation characteristic measurement-repetition of next current point test; by the arrangement, the heating and heat transfer rules of the high-voltage sleeve in the running state and the influence rules of the heat effect on the insulating performance of the high-voltage sleeve can be obtained at the same time.
Drawings
Fig. 1 is a schematic diagram of the overall structure of an experimental device 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 testing 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 insulation performance measurement assembly in an experimental apparatus for insulation testing 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 other embodiments of the present invention.
In the figure, 1, an experimental device; 10. a high voltage 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 rod; 1032. a first switch; 104. a second connection assembly; 1041. a second connecting guide rod; 1042. a second switch; 20. an oil tank assembly; 201. a housing; 2011. a receiving chamber; 202. a first elevation seat; 203. a second elevation seat; 204. a current booster; 205. a current transformer; 30. a temperature measurement assembly; 301. a measuring line; 302. a recorder; 40. an insulation performance measurement assembly; 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 according to 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; the oil tank assembly 20 is internally provided with oil, and the bottom end of the high-voltage sleeve assembly 10 is inserted into the oil tank assembly 20 and immersed in the oil, wherein the oil is used for providing an insulating environment for the high-voltage sleeve assembly 10; the oil tank assembly 20 is used to simulate an actual operating environment, thereby improving the accuracy of the results of the insulation characteristic detection and the temperature detection of the high-voltage bushing by the experimental device 1.
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 connection mechanism disposed between the first high-voltage bushing 101 and the second high-voltage bushing 102, wherein 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 insulation performance measuring assembly 40; the temperature measurement assembly 30 is used for measuring and recording the temperature inside the first high voltage bushing 101; the insulation performance measurement assembly 40 is used for performing insulation performance measurement on the second high voltage bushing 102; through setting up temperature measurement subassembly and insulating properties measurement subassembly, can obtain the heating and heat transfer law of high-voltage bushing under running state and the influence law of thermal effect to high-voltage bushing insulating properties simultaneously in the experiment.
Specifically, the first high-voltage bushing 101 and the second high-voltage bushing 102 are arranged at intervals, one side of the connecting mechanism is connected with the first high-voltage bushing 101, and the other side of the connecting 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, where the first connection component 103 and the second connection component 104 are disposed opposite to each other, the top ends of the first high-voltage bushing 101 and the second high-voltage bushing 102 are connected by the first connection component 103, the bottom ends of the first high-voltage bushing 101 and the second high-voltage bushing 102 are connected by 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 are enclosed to form a test loop, and the first connection component 103 and the second connection component 104 are used for controlling the closing and opening of the test loop.
Specifically, the central axis of the first high-voltage bushing 101 is parallel to the central axis of the second high-voltage bushing 101, one end of the first connecting component 103 is detachably connected with the top end of the first high-voltage bushing 101, the other end of the first connecting component 103 is detachably connected with the top end of the second high-voltage bushing 102, the second connecting component 104 is accommodated in the oil tank component 20, one end of the second connecting component 104 is detachably connected with the bottom end of the first high-voltage bushing 101, and the other end of the second connecting component 104 is detachably connected with the bottom end of the second high-voltage bushing 102. Wherein, when the temperature measurement is carried out, 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. 1-3, in this embodiment, a temperature measurement assembly 30 is connected to the first high voltage bushing 101, the temperature measurement assembly 30 being configured to measure and record the 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 characteristics 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 in the temperature rise process of the first high-voltage sleeve 101 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 internal heating and heat transfer rule of the high-voltage bushing in the operation process and the influence rule of the heat effect on the insulation performance of the high-voltage bushing are mastered.
Further, in the present embodiment, the tank assembly 20 includes a housing 201, a first elevating seat 202, and a second elevating seat 203; the casing 201 encloses to be set up to hold the chamber 2011, and fluid holding is in holding the chamber 2011, and first rising seat 202 and second rising seat 203 interval set up on the top of casing 201, and the cover is equipped with the lift ware 204 on the first rising seat 202, and the inner wall of lift ware 204 and the outer wall interval of first rising seat 202 are predetermine the distance, and the bottom of lift ware 204 is supported on the top of casing 201, and lift ware 204 is used for providing the electric current for test circuit.
Specifically, the bottom end of the first lifting seat 202 abuts against the top end of the housing 201, and the bottom end of the second lifting seat 203 abuts against the top end of the housing 201. The first lifting seat 202 is disposed corresponding to the first high-voltage bushing 101, the second lifting seat 203 is disposed corresponding to the second high-voltage bushing 102, and the first lifting seat 202 and the second lifting 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 received in the receiving cavity 2011 and heated to a temperature (60±2) c higher than ambient temperature, which provides an insulating environment for the high voltage bushing assembly 10.
For example, the booster 204 may be a through-hole booster, although the booster 204 may take other forms as long as it is capable of providing current to the test circuit. In an implementation manner that the booster 204 adopts a through booster, the booster 204 is sleeved on the first booster seat 202, the inner wall of the booster 204 is spaced from the outer wall of the first booster seat 202 by a preset distance, the booster 204 is connected with an external voltage regulator, and the voltage regulator is used for providing an input power supply for the booster 204.
With continued 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 is abutted to 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 lifting seat 203, and the bottom end of the second flange 1021 abuts against the top end of the second lifting 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 oil; the bottom end of the second high-pressure sleeve 102 is inserted into the accommodating chamber 2011 through the second elevating seat 203 and immersed in oil.
Further, in this embodiment, the second high voltage bushing 102 is sleeved with a 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 in the second elevating seat 203, and the current transformer 205 is sleeved on the second high-voltage sleeve 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 includes a measuring line 301 and a recorder 302, one end of the measuring line 301 is connected to the recorder 302, and the other end of the measuring line 301 is connected to the first high-voltage bushing 101.
Specifically, a plurality of temperature measuring holes are formed in the first high-voltage bushing 101, and the temperature measuring holes are formed in the temperature measuring points, one end of the measuring wire 301 is buried in the temperature measuring hole where the temperature is to be measured, and the measuring wire 301 is used for measuring the temperature of the temperature measuring points.
For example, the measurement line 301 may be a T-type thermocouple line, and of course, the temperature measurement line 301 may be a K-type thermocouple line or an E-type thermocouple line. In an implementation where the temperature measurement line 301 is a T-thermocouple line, the optimal temperature measurement range for the T-thermocouple line is 0-150 ℃.
With continued reference to fig. 3, in the present embodiment, the insulation performance measurement assembly 40 includes an insulation diagnostic apparatus 401 and a display device 402, one end of the insulation diagnostic apparatus 401 is connected with the second high-voltage bushing 102 in a wired manner, and the other end of the insulation diagnostic apparatus 401 is connected with the display device 402; insulation diagnostic apparatus 401 is used to measure the insulation characteristics of second high voltage bushing 102.
With continued reference to fig. 1, in the present embodiment, the first connection assembly 103 includes a first connection rod 1031 and a first switch 1032, one end of the first connection rod 1031 is connected to the top end of the first high voltage bushing 101, the other end of the first connection rod 1031 is connected to the top end of the second high voltage bushing 102, the first switch 1032 is disposed on the first connection rod 1031, and the first switch 1032 is used for controlling the opening and closing of the test circuit.
With continued reference to fig. 1, in the present 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 used for controlling the opening and closing of the test circuit.
Specifically, when both the first switch 1032 and the second switch 1042 are closed, the test circuit is in the closed state, and when both the first switch 1032 and the second switch 1042 are open, the test circuit is in the 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 measuring points are disposed on a first high-voltage bushing 101, the testing method includes the following steps:
a temperature measurement step: the test loop is closed and the current booster 204 supplies 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 rules of the high-voltage sleeve, the first high-voltage sleeve 101 and the second high-voltage sleeve 102 are made of the same material and the same size of the converter transformer valve side glue-dipped paper sleeve.
Specifically, the current value provided by the current booster to the test loop is a specified current value.
Further, in this embodiment, the oil is heated before the temperature measurement step, so that the temperature of the oil is 60±2 ℃ higher than the ambient temperature. Before the test starts, the first high-voltage bushing 101 and the second high-voltage bushing 102 are filled with SF 6 gas with the lowest operating pressure, and the SF 6 gas needs to be at the ambient temperature before the test starts.
Specifically, the casing 201 is connected with an external oil filter, and the oil in the casing 201 is heated and circulated through the oil filter, so that the oil is maintained within a range 60+ -2 ℃ higher than the ambient temperature.
The test loop is closed, the voltage regulator provides an input power supply for the booster 204, the booster 204 provides a 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 by 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 has an increased heat generation amount due to the presence of contact resistance, and it is necessary to polish and smooth the connection portion and apply 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.
For example, 64 temperature measuring points are provided, wherein 1 to 24 temperature measuring points are used for measuring the temperature of the current carrying conduit, and 24 temperature measuring 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 connecting terminal at the bottom end of the first high-voltage sleeve 101; 27 is used for measuring the temperature of the oil; the temperature measuring points 28-54 are used for measuring the surface temperature and the internal temperature of the core body; 55 to 56 for measuring the temperature of SF 6 gas at the top end of the first high-voltage bushing 101; the temperature measuring points 57 to 60 are used for measuring the temperature of the outside 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 connecting terminal at the top end of the first high-voltage sleeve 101; the temperature measuring points 63 to 64 are used for measuring the temperature of the surrounding environment.
A temperature measuring hole is formed in the temperature measuring point, one end of the measuring line 301 is buried in the temperature measuring hole, scraps generated when the temperature measuring hole is formed are filled in the temperature measuring hole, and the measuring line 301 is fixed through an insulating adhesive tape.
Illustratively, the current booster 204 applies 2500A, 4000A, 5000A current to the test circuit, respectively, and the temperature rise process of each temperature measurement point in the first high voltage bushing 101 is measured by the measurement line 301 when the current booster 204 applies 2500A current.
An insulation characteristic measurement step: the current drops to zero, the test loop is opened, the insulation performance measuring assembly 40 applies a 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 completed, and the current of the test loop is raised to a set value by the current booster 204.
Wherein the current of the test loop is reduced to zero by the current booster 204 prior to the insulation characteristic test. To prevent the applied test voltage from affecting the measurement line 301, the test loop needs to be disconnected, i.e. the first switch 1032 and the second switch 1042 are opened.
The insulation diagnostic apparatus 401 applies 200V voltage to the second high voltage bushing 102 to perform FDS insulation characteristic measurement and PDC test; the FDS insulation characteristic measurement includes dielectric loss tangent, capacitance, 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 immediately, at this time, the test circuit is closed, and the current of the test circuit is raised to the set value by the booster 204.
Repeating the temperature measurement steps: the temperature measuring assembly 30 continues to measure and record the temperature of the temperature measuring point until the temperature of the temperature measuring 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 stable temperature of the temperature measuring point is recorded by the recorder 302. It is to be noted that, according to IEC 60137 standard, the temperature-stabilizing criterion is that the temperature rise change of 1h is not more than 1K. According to the temperature rise test stability criterion specified by the DL/T4109 standard, the dielectric loss factor change delta tan delta of less than or equal to 0.02 percent per hour is used as the temperature rise test stability basis.
Repeating the insulation characteristic measuring step: the insulation characteristic of the second high voltage bushing 102 is repeatedly measured every predetermined time period until the insulation characteristic of the second high voltage bushing 102 reaches a stable value.
Illustratively, the insulation characteristic of the second high voltage bushing 102 is repeatedly measured when the predicted time period is equal to 1 hour. Of course, the expected duration may be greater than 1 hour, and the expected duration may be less than 1 hour.
The next measuring step of current point: the first high voltage bushing 101 and the second high voltage bushing 102 are naturally cooled to an ambient temperature, and a temperature measurement is performed for the next current point and an insulation characteristic measurement is performed for the second high voltage bushing 102.
The current point is a specified current value applied to the test circuit.
Specifically, after the insulation characteristic and the temperature measurement of the last current point reach the stable values, 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 each temperature test is completed, and then the next current point test is started.
In the test method provided by the embodiment, an experimental device 1 is adopted in the test process; the experimental device 1 comprises a high-voltage sleeve assembly 10, an oil tank assembly 20, a temperature measuring assembly 30 and an insulating property measuring assembly 40; the oil tank assembly 20 is internally provided with oil, and the bottom end of the high-voltage sleeve assembly 10 is inserted into the oil tank assembly 20 and immersed in the changed oil, wherein the oil is used for providing an insulating environment for the high-voltage sleeve assembly 10; the high-voltage bushing assembly 10 comprises a first high-voltage bushing 101, a second high-voltage bushing 102 which is arranged opposite to the first high-voltage bushing 101, and a connecting mechanism, wherein 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 respectively 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 measurement assembly 30 is used for measuring and recording the temperature inside the first high voltage bushing 101; the insulation performance measurement assembly 40 is used for performing insulation performance measurement on the second high voltage bushing 102; the test flow is as follows: temperature measurement-insulation characteristic measurement-repetition of temperature measurement-repetition of insulation characteristic measurement-repetition of next current point test; by the arrangement, the heating and heat transfer rules of the high-voltage sleeve in the running state and the influence rules of the heat effect on the insulating performance of the high-voltage sleeve can be obtained at the same time.
It should be noted that in this document relational terms such as first and second, and the like are 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. Moreover, 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 one … …" does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises the element.
Finally, it should be noted that: it is apparent that the above examples are only illustrative of the present invention and are not limiting of the embodiments. Other variations or modifications of the above teachings will be apparent to those of ordinary skill in the art. It is not necessary here nor is it exhaustive of all embodiments. And obvious variations or modifications thereof are contemplated as falling within the scope of the present invention.
Claims (4)
1. Experimental device for be used for high voltage bushing insulation test and temperature detection, its characterized in that: the device comprises a high-voltage sleeve assembly, an oil tank assembly, a temperature measuring assembly and an insulating property 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 immersed in the oil, and the oil is used for providing an insulating environment for the high-voltage sleeve assembly;
The high-voltage sleeve assembly comprises a first high-voltage sleeve, a second high-voltage sleeve and a connecting mechanism, wherein the second high-voltage sleeve is arranged opposite to the first high-voltage sleeve, 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 sleeve;
the insulation performance measurement assembly is used for measuring the insulation characteristics of the second high-voltage sleeve;
The temperature measurement assembly comprises a measurement line and a recorder, one end of the measurement line is connected with the recorder, and the other end of the measurement line is connected with the first high-voltage sleeve;
A plurality of temperature measuring points are arranged on the first high-voltage sleeve, temperature measuring holes are formed in the temperature measuring points, one end of a measuring wire is buried in the temperature measuring holes needing to be measured, and the measuring wire is used for measuring the temperature of the temperature measuring points;
the connecting mechanism comprises a first connecting component and a second connecting component, the first connecting component and the second connecting component are oppositely arranged, the top ends of the first high-voltage sleeve and the second high-voltage sleeve are connected through the first connecting component, the bottom ends of the first high-voltage sleeve and the second high-voltage sleeve are connected through the second connecting component, the second connecting component is accommodated in the oil tank component, and the first high-voltage sleeve, the second high-voltage sleeve, the first connecting component and the second connecting component are jointly enclosed to form a test loop, and the first connecting component and the second connecting component are used for controlling the closing and the opening of the test loop;
the oil tank assembly comprises a shell, a first lifting seat and a second lifting seat;
The shell is enclosed to form a containing cavity, the oil liquid is contained in the containing cavity, the first lifting seat and the second lifting seat are arranged at the top end of the shell at intervals, the first lifting seat is sleeved with a current booster, the inner wall of the current booster and the outer wall of the first lifting seat are at intervals by a preset distance, the bottom end of the current booster is propped against the top end of the shell, and the current booster is used for providing current for the test loop;
The first high-voltage sleeve is sleeved with a first flange, the second high-voltage sleeve is sleeved with a second flange, the bottom end of the first high-voltage sleeve 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 sleeve is inserted into the accommodating cavity through the second lifting seat, and the bottom end of the second flange is abutted with the top end of the second lifting seat;
the second high-voltage sleeve is sleeved with a current transformer, the current transformer 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 into the second lifting seat;
The current transformer is used for measuring the current of the test loop;
the insulation performance measurement assembly comprises an insulation diagnostic instrument and display equipment, one end of the insulation diagnostic instrument is connected with the second high-voltage sleeve in a wired mode, and the other end of the insulation diagnostic instrument is connected with the display equipment;
the measuring line adopts a T-shaped thermocouple line, and the optimal temperature measuring range of the T-shaped thermocouple line is 0-150 ℃;
the insulation diagnostic instrument performs FDS insulation characteristic measurement and PDC test on the second high voltage bushing.
2. The experimental set-up for insulation testing and temperature detection of high voltage bushings according to claim 1, wherein: 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 opening and closing of the test loop.
3. The experimental set-up for insulation testing and temperature detection of high voltage bushings according to claim 1, wherein: the second connecting assembly comprises a second connecting guide rod and a second switch, one end of the second connecting guide rod is connected with the bottom end of the first high-voltage sleeve, the other end of the second connecting guide rod is connected with the bottom end of the second high-voltage sleeve, the second switch is arranged on the second connecting guide rod, and the second switch is used for controlling the opening and closing of the test loop.
4. A test method using the experimental set-up according to any one of claims 1-3, characterized in that: the first high-voltage sleeve is provided with a plurality of temperature measuring points, and the testing method comprises the following steps:
a temperature measurement step: closing the test loop, providing current for the test loop by the current booster, and measuring and recording the temperature of the temperature measuring point by the temperature measuring assembly;
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 sleeve to measure the insulation characteristic of the second high-voltage sleeve, the test loop is closed after the measurement is finished, and the current of the test loop is increased to a set value by the current booster;
repeating the temperature measurement steps: 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 sleeve at intervals of expected time intervals until the insulation characteristic of the second high-voltage sleeve reaches a stable value;
the next measuring step of current point: and naturally cooling the first high-voltage sleeve and the second high-voltage sleeve to the ambient temperature, and measuring the temperature of the next current point and the insulation characteristic of the second high-voltage sleeve.
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| CN113640625B (en) * | 2021-07-06 | 2023-12-01 | 中国电力科学研究院有限公司 | Method and test device for evaluating highest temperature inside high-voltage sleeve |
| CN115015684B (en) * | 2022-08-10 | 2022-11-29 | 山东和兑智能科技有限公司 | High-voltage bushing digital evaluation method and system based on time-frequency domain feature fusion |
| CN117269691B (en) * | 2023-09-27 | 2024-05-14 | 国网山西省电力公司电力科学研究院 | System and method for testing internal state and insulation characteristic of wall bushing |
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