CN214794649U - Transformer oil ignition experimental device - Google Patents
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- CN214794649U CN214794649U CN202121005254.4U CN202121005254U CN214794649U CN 214794649 U CN214794649 U CN 214794649U CN 202121005254 U CN202121005254 U CN 202121005254U CN 214794649 U CN214794649 U CN 214794649U
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Abstract
The utility model discloses a transformer oil ignition experimental device, which comprises a transformer simulation assembly, an electric spark generation assembly and a heater for heating the transformer oil in the transformer simulation assembly; the transformer simulation assembly comprises a transformer simulation shell and a plurality of temperature measurement pieces capable of measuring temperatures at different heights and positions, the temperature measurement pieces stretch into the transformer simulation shell, the electric spark generation assembly comprises an electric spark generator and an ignition electrode, the ignition electrode is connected with the electric spark generator, and the ignition electrode is connected to the wall of the transformer simulation shell and stretches into the transformer simulation shell. The utility model has the advantages that: the ignition process of the transformer oil caused by heating can be simulated, guidance is provided for pre-control measures in the early stage of transformer oil fire, and the occurrence of transformer fire is fundamentally reduced.
Description
Technical Field
The utility model relates to a hot detection technical field of transformer oil, concretely relates to transformer oil experimental apparatus that ignites.
Background
The power transformer, especially the large oil-immersed power transformer, is an important device in the AC/DC power transmission project, and the reliability of the power transformer directly determines the stability and safety of the AC/DC power transmission project. In the power transformer, a large amount of transformer oil is required to be used as a medium for insulation and cooling, and the transformer oil combustion is the root cause of fire and explosion accidents of the transformer. Therefore, the research on the combustion characteristics of the transformer oil is a key for improving the reliability of the power supply and fire extinguishing system, the ignition temperature and the minimum ignition energy of the transformer oil are accurately mastered, the important index for judging and evaluating the fire hazard risk of the transformer oil is provided, and the premise for realizing the state maintenance of the transformer is provided.
During the operation of the transformer, under the action of various factors such as heat, electricity, machinery, chemistry and the like for a long time, internal faults can occur to generate high temperature, and combustible transformer oil is heated or generates electric arcs to thermally crack and release a large amount of light hydrocarbons, such as H2, C2H2 and other flammable gases, so that the flash point and the ignition point of the transformer oil are reduced. In addition, transformer oil is affected by many factors such as electric field, temperature, oxygen, moisture, etc., which together cause the combustion characteristics of transformer oil to change.
Although the combustion characteristics of transformer oil contain many factors, the ignition point of transformer oil is an indispensable item for supervising the operation state of transformer oil in the transformer. The device can find out the fault of the device in time by measuring the ignition point, and meanwhile, for the transformer oil which is newly filled into the device and is repaired, the ignition point can be measured to prevent or find out whether the oil product of the light fraction is mixed, thereby ensuring the safe operation of the device.
In the prior art, the ignition point of petroleum products is usually detected by using a thermometer or an infrared receiver, for example, an open flash ignition point automatic determinator for petroleum products produced by a certain company in China generally detects the flash point and the ignition point at the same time, but the combustion of the ignition point of the petroleum products gradually pollutes detection parts in the actual detection work, a detector is not removed from the ignition point part in time after the ignition point detection, the pollution to the detection parts is not blocked, and the service life of the instrument is influenced; meanwhile, the measurement sample is small, the flow of outside air and the number of pilot combustion can affect the oil vapor in the test process, and the accuracy of the measured ignition temperature is finally affected.
Meanwhile, in the event of fire explosion of the transformer oil, the important standard for judging the ignition of the transformer oil is the ignition sensitivity of the transformer oil, the ignition sensitivity refers to the difficulty of combustion and explosion under the action of external energy, and the ignition sensitivity is usually described by the minimum ignition energy, so the minimum ignition energy of the transformer oil is taken as one of important parameters for measuring the risk of fire explosion. The transformer oil is used as an insulating and cooling medium, the temperature of oil in the operation process can be higher than the ambient temperature, the energy of a combustible system can be increased due to the temperature rise, the ignition of the combustible system is easier, the fire hazard risk of the transformer oil is increased, and different minimum ignition energy for ignition of the transformer oil can be generated at different initial transformer oil temperatures.
At present, many experimental platforms are used for carrying out experiments on the fire spreading condition of a fire or the fire extinguishing capacity of a fire extinguishing system, and the minimum ignition energy is not measured as much as possible. As in application No.: 201911356789.3, discloses an experimental platform for simulating fire of an extra-high voltage converter transformer, which is characterized in that the platform comprises a transformer system, a heating system and a test system, wherein the transformer system is arranged in a U-shaped firewall space and comprises a steel structure support, an oil tank fixed on the steel structure support, an oil conservator connected with the oil tank through an oil pipeline, and a bottom oil pool arranged on the ground and adjacent to the steel structure support; the heating system comprises an oil tank resistance external circulation heating system, a bottom oil pool resistance heating system, an oil conservator resistance heating system and a temperature control cabinet, wherein the resistance external circulation heating system comprises a heating cabinet, an oil inlet pipeline and an oil outlet pipeline which are connected with the heating cabinet, and the oil inlet pipeline and the oil outlet pipeline are respectively connected with the oil tank through control valves; the bottom oil pool resistance heating system and the conservator resistance heating system are respectively fixed in the bottom oil pool and the conservator and are connected with the temperature control cabinet through a plurality of heating pipes through electric wires and signal wires; the test system comprises a plurality of temperature sensors, a plurality of heat flow sensors, a thermal infrared imager and a plurality of high-definition cameras, and is respectively connected with a data acquisition, analysis, display and control system outside the platform; the plurality of temperature sensors are uniformly distributed in the oil tank, the oil conservator and the bottom oil pool, and the plurality of heat flow sensors are uniformly distributed on two sides of the oil tank; the thermal infrared imager is arranged on the opening side of the U-shaped firewall and is kept at a certain distance from the transformer and used for shooting a temperature field in a fire disaster; the high-definition cameras are respectively arranged in four corners at the top of the U-shaped firewall and the closed side wall body of the U-shaped firewall and used for shooting the test process.
The experiment platform is used for measuring the fire extinguishing efficiency of a fire extinguishing system, cannot obtain the minimum ignition energy at different initial temperatures, cannot provide some research data of the initial stage of a fire disaster, and cannot provide some research bases for preventing the fire disaster. At present, no test device and test method for minimum ignition energy of transformer oil ignition at different initial temperatures are found.
The information disclosed in this background section is only for enhancement of understanding of the general background of the invention and should not be taken as an acknowledgement or any form of suggestion that this information constitutes prior art already known to a person skilled in the art.
SUMMERY OF THE UTILITY MODEL
The utility model discloses the technical problem that will solve lies in: how to solve the problem that ignition point detection data of transformer oil in the prior art is not accurate enough, no device for testing minimum ignition energy of transformer oil ignition at different initial temperatures exists, and no experimental platform and method for obtaining research data of ignition and combustion mechanisms of transformer oil exist.
The utility model discloses a following technical means realizes solving above-mentioned technical problem:
the transformer oil ignition experimental device comprises a transformer simulation assembly, an electric spark generation assembly for igniting transformer oil and a heater for heating the transformer oil;
the transformer simulation assembly comprises a transformer simulation shell and a plurality of temperature measurement pieces capable of measuring temperatures at different heights and positions, the temperature measurement pieces stretch into the transformer simulation shell, the electric spark generation assembly comprises an electric spark generator and an ignition electrode, the ignition electrode is connected with the electric spark generator, and the ignition electrode is connected to the wall of the transformer simulation shell and stretches into the transformer simulation shell.
The utility model can ignite the transformer oil by different ignition energies at different initial temperatures, and record the temperature and the minimum ignition energy in the process; the ignition process of transformer oil in the transformer caused by heating is simulated, and the experimental credibility is improved; the surface and internal temperature changes and the ignition temperature of the transformer oil before and after ignition are measured, so that the consumption of oil vapor caused by the flow of outside air and the number of pilot firing times in the experimental process is eliminated, and the accuracy of ignition temperature measurement is improved; the transformer oil temperature can reach the preset temperature through the heating device, the minimum ignition energy of transformer oil ignition at different or specified temperatures can be measured by utilizing the electric spark generation system, and then the ignition characteristic of the transformer oil is analyzed, so that the ignition and combustion mechanism of the transformer oil in operation is researched, guidance is provided in the aspect of pre-control measures in the early stage of transformer oil fire, the transformer fire is fundamentally reduced, the stability of a power grid is improved, and the personal safety, the equipment safety and the property safety are guaranteed.
Preferably, the transformer simulation shell comprises a first shell, a second shell and a base, the first shell and the second shell are detachably connected, a cavity for containing transformer oil is formed by the first shell and the second shell, the base is connected to the bottom of the second shell, and the heater is placed in the base.
Preferably, the second casing is a cavity with an opening at the top end, the first casing is a cavity with an opening at the bottom, the bottom of the first casing is provided with a clamping plate, the top of the second casing is provided with a clamping groove, and the clamping plate is clamped in the clamping groove.
Preferably, the temperature measuring device further comprises a fixing support for fixing the temperature measuring part, the top end of the first shell is provided with a plurality of through holes, the fixing support is of a tubular structure, and the fixing support is inserted into the through holes and extends out of the first shell.
Preferably, the fixed support is provided with a plurality of temperature measuring holes arranged at intervals, the plurality of temperature measuring pieces extend into the fixed support, and sensing ends of the temperature measuring pieces are located at the temperature measuring holes.
Preferably, the vertical distance between the temperature measuring holes is 40-60mm, and each fixing support is provided with 10-20 temperature measuring holes.
Preferably, the side of the first housing has a plurality of sleeve simulating apertures communicating with the interior thereof; the side wall of the second housing also has an ignition electrode placement aperture for mounting an ignition electrode.
Preferably, the ignition electrode placing hole is two small holes which are symmetrically arranged.
Preferably, the temperature measuring part is a thermocouple, and a thermocouple string consisting of a plurality of thermocouples is placed in the fixed support.
The temperature measuring part mostly uses a thermocouple, and if the thermocouple is directly put into transformer oil, the lead of the thermocouple is damaged at high temperature; therefore, the fixing support can be used for fixing the temperature measuring piece on one hand, and the temperature measuring ends of the temperature measuring piece are fixed at different heights, so that the temperature at different heights can be measured conveniently; moreover, the lead can be protected and prevented from being burnt out.
Preferably, the electric spark generating assembly is positioned at one side of the transformer simulating assembly, and the heater is positioned below the transformer simulating assembly.
The utility model has the advantages that:
(1) the utility model provides a transformer oil experimental apparatus that ignites can simulate the ignition process that transformer oil takes place in the transformer is heated, improves the credibility of experiment; the surface and internal temperature changes and the ignition temperature of the transformer oil before and after ignition are measured, so that the consumption of oil vapor caused by the flow of outside air and the number of pilot firing times in the experimental process is eliminated, and the accuracy of ignition temperature measurement is improved; the transformer oil temperature can reach the preset temperature through the heating device, the minimum ignition energy of transformer oil ignition at different or appointed temperatures can be measured by utilizing an electric spark generation system, and then the ignition characteristic of the transformer oil is analyzed, so that the ignition and combustion mechanism of the transformer oil in operation is researched, guidance is provided in the aspect of pre-control measures in the early stage of transformer oil fire, the transformer fire is fundamentally reduced, the stability of a power grid is improved, and the personal safety, the equipment safety and the property safety are guaranteed;
(2) the temperature measuring part mostly uses a thermocouple, and if the thermocouple is directly put into transformer oil, the lead of the thermocouple is damaged at high temperature; therefore, the fixing support can be used for fixing the temperature measuring piece on one hand, and the temperature measuring ends of the temperature measuring piece are fixed at different heights, so that the temperature at different heights can be measured conveniently; moreover, the lead can be protected and prevented from being burnt out; and after the detection is finished, the thermocouple is removed in time, so that the service life of the detection part is prolonged.
Drawings
Fig. 1 is a schematic structural diagram of an experimental device for igniting transformer oil in a first embodiment of the present invention;
FIG. 2 is a schematic diagram of a transformer simulation assembly;
FIG. 3 is a front view of a transformer oil ignition test apparatus;
FIG. 4 is a schematic structural view of an electrical discharge generating assembly;
FIG. 5 is a schematic view of a thermocouple arrangement;
FIG. 6 is a schematic structural diagram of an experimental apparatus for igniting transformer oil in the second embodiment
FIG. 7 is a schematic structural diagram of a transformer oil pilot experiment apparatus in a second embodiment;
FIG. 8 is a graph of the change in temperature of the K150X transformer oil thermocouple;
reference numbers in the figures:
1. a transformer simulation component; 11. a transformer simulation shell; 111. a first housing; 112. a second housing; 113. a base; 114. the sleeve simulates an orifice; 115. a first hole; 116. a second hole; 12. fixing a bracket;
2. a fuel supply recovery assembly; 21. a supply fuel conduit; 22. a recovery fuel line; 23. an oil storage pool; 24. a recovery tank; 25. a bearing frame; 26. adjusting the bolt; 27. an electrically controlled gate;
3. an electrical spark generating assembly; 31. an electric spark generator; 311. a power indicator light; 312. a power switch; 313. an ignition switch; 314. a numerical control device; 32. an ignition electrode;
4. a heater; 41. a temperature adjusting knob; 42. a heating plate;
Detailed Description
To make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the embodiments of the present invention are combined to clearly and completely describe the technical solution in the embodiments of the present invention, and obviously, the described embodiments are some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.
The first embodiment is as follows:
as shown in fig. 1 and fig. 3, the transformer oil ignition experimental device includes a transformer simulation assembly 1, an electric spark generation assembly 3 for igniting transformer oil, and a heater 4 for heating transformer oil in the transformer simulation assembly 1;
the transformer simulation assembly 1 comprises a transformer simulation shell 11 and three fixing supports 12 for mounting and fixing temperature measuring pieces, wherein the temperature measuring pieces in the embodiment are thermocouples (thermocouples are not shown in the figure); the three fixing supports 12 extend into the transformer simulation shell 11, the top ends of the three fixing supports extend out of the transformer simulation shell 11, the thermocouples can be connected with external data storage equipment, and the temperature can be measured and recorded; as shown in fig. 4, the electric spark generating assembly 3 includes an electric spark generator 31, an ignition electrode 32, the electric spark generator 31 is disposed on one side of the transformer simulation shell 11, the ignition electrode 32 is connected to the electric spark generator 31 through a wire 33, and the ignition electrode 32 is connected to a wall of the transformer simulation shell 11 and extends into the transformer simulation shell 11.
Specifically, as shown in fig. 2, the transformer simulation shell 11 includes a first shell 111, a second shell 112, and a base 113, where the first shell 111 and the second shell 112 are both made of stainless steel, the second shell 112 is a rectangular cavity with an open top end, the first shell 111 is a quadrangular frustum pyramid structure shell with an open bottom, a clamping plate may be arranged at the bottom of the first shell 111, and detachably connected with a clamping groove at the top end of the second shell 112, or in other detachable connection manners; the first shell 111 and the second shell 112 are connected to form a cavity for containing transformer oil, before an experiment, the first shell 111 can be opened, the transformer oil is injected, the first shell 111 and the second shell 112 are connected, the base 113 is connected to the bottom of the second shell 112, the top of the base 113 can be a flat plate and is welded to the bottom of the second shell 112, the bottom of the flat plate comprises four upright posts to form a placing space, and the heater 4 is placed in the base 113.
The top end of the first shell 111 is provided with a placing hole for fixing a temperature measuring part, a fixing support 12 is placed in the placing hole, the side part of the first shell 111 is provided with a plurality of sleeve simulation orifices 114 communicated with the inside of the first shell, and the sleeve lifting seat hole in a transformer structure can be simulated better; the side wall of the second housing 112 also has an ignition electrode placement opening for mounting the ignition electrode 32, which facilitates the use of the ignition electrode 32 to sweep across the surface of the transformer simulation housing 11, and the ignition electrode placement opening is two symmetrically arranged holes, or other adaptive holes.
As shown in fig. 5, the temperature measuring elements in this embodiment are thermocouples, the number of the fixing brackets 12 is three, the fixing brackets 12 are strip-shaped circular tube structures, and 12 thermocouple strings are installed in each fixing bracket 12; temperature measuring holes are formed in the fixed support 12 at intervals, and a thermocouple extends into the transformer simulation shell 11 through the temperature measuring holes, so that the temperature sensing tip of the thermocouple is located inside an oil layer of the transformer simulation shell 11 and in the air, and the oil temperature of transformer oil at different heights and positions before ignition, the temperature of oil steam above the oil layer, the temperature of the ignited oil layer and the temperature of flame are measured conveniently. Referring to fig. 5, there are 36 measurement points T1, T2.. T36, and the distance between adjacent temperature measurement holes on the same fixed bracket 12 is 50mm, the measurement head of the thermocouple measures the temperature of the transformer oil or air from the temperature measurement holes, and the lead of the thermocouple is located inside the fixed bracket 12 to avoid being corroded by high temperature.
In this embodiment, referring to fig. 1 and fig. 3, the heater 4 is an electric heating furnace. The electric heating furnace is placed under the transformer simulation shell 11, the heating rate of the electric heating furnace can be adjusted through a switch and a temperature adjusting knob 41, the bottom of the transformer simulation shell 11 is heated through a heating disc 42, heat loss is not counted, and the heating time required by the transformer oil at the specified initial temperature can be calculated according to a formula Q which is cm delta t and W which is Pt, wherein W is work done by the electric heating furnace, P is heating power, t is heating time, Q is absorbed heat of the transformer oil, c is specific heat capacity, and delta t is oil temperature difference; by placing the thermocouple, the instantaneous temperature of the transformer oil when ignited can be recorded, and further experimental research and analysis are carried out.
As shown in fig. 4, the electric spark generating assembly 3 in this embodiment is composed of an electric spark generator 31 and an ignition electrode 32, the electric spark generator 31 includes a power indicator 311, a power switch 312, an ignition switch 313, and a numerical control device 314, the electric spark generator 31 controls the device to switch and ignite through the power switch 312 and the ignition switch 313, the ignition electrode 32 and the electric spark generator 31 are connected through an electric wire 33, and the numerical control device 314 can control the minimum ignition energy by adjusting the output voltage, the ignition power, and the ignition time; the output voltage of the positive and negative power supplies is increased to 10kV to 60kV by a transformer inside the electric spark generator 31, the selectable capacitances of the capacitance group in the electric spark generator 31 are 10pF, 30pF, 100pF, 300pF, 1nF, 3nF, 10nF and 1 μ F, and the ignition energy can be calculated according to the formula E of 0.5CU2, where E is the output energy, C is the capacitance, and U is the output voltage.
Example two:
as shown in fig. 6 and 7, in the first embodiment, on the basis of the first embodiment, the present embodiment provides an oil supply and recovery assembly, and further includes a fuel supply and recovery assembly 2, where the fuel supply and recovery assembly 2 includes a fuel supply pipeline 21, a fuel recovery pipeline 22, an oil storage tank 23, a recovery tank 24, and a bearing frame 25, and one end of the fuel supply pipeline 21 is communicated with an upper portion of the transformer simulation housing 11; the other end is connected with an oil storage pool 23, one end of the recovered fuel pipeline 22 is communicated with the lower part of the transformer simulation shell 11, and the other end is connected with a recovery pool 24, so that the supply and recovery of fuel are realized.
As shown in fig. 2, the rear side wall of the second casing 112 has a first hole 115 for connecting the supply fuel pipe 21 and a second hole 116 for connecting the recovery fuel pipe 22, and in order to prevent oil leakage during the experiment, sealing is performed at the interfaces (the first hole 115 and the second hole 116) inside the transformer simulation casing 11 and the stainless pipe interfaces, respectively.
The bearing frame 25 comprises two layers of bearing plates which are arranged up and down, the oil storage pool 23 is arranged on the upper layer of bearing plate, the recovery pool 24 is arranged on the lower layer of bearing plate, one end of the fuel supply pipeline 21 is connected with the lower position of the oil storage pool 23, the other end of the fuel supply pipeline is connected with the first hole 115 of the transformer simulation shell 11, one end of the fuel recovery pipeline 22 is connected with the recovery pool 24 or the end part of the fuel supply pipeline is bent downwards to form a water tap-shaped structure, the placement height of the recovery pool 24 is lower than the lowest position of the fuel recovery pipeline 22, and the other end of the fuel recovery pool is connected with the second hole 116 of the transformer simulation shell 11. The supply fuel pipeline 21 and the recovery fuel pipeline 22 are both provided with an electric control gate 27, and the two electric control gates 27 can respectively control the supply speed of the oil storage tank 23 and the oil spilling speed of the transformer simulation shell 11.
Wherein, the bottom of lower floor's bearing plate has a plurality of adjusting bolt 26 that are used for height-adjusting, and the upper bearing plate in this embodiment is square board with lower floor's bearing plate, and adjusting bolt 26 is four, and evenly distributed is in four departments of lower floor's bearing plate, and adjusting bolt 26 is threaded connection with lower floor's bearing plate, through revolving wrong adjusting bolt 26, can finely tune the required liquid level height requirement of highly adapted experiment of whole bearing frame 25.
The experimental method adopting the transformer oil ignition experimental device in the second embodiment comprises the following steps:
step S01: assembling a transformer oil ignition experimental device; specifically, the transformer simulation assembly 1, the fuel supply recovery assembly 2, the electric spark generation assembly 3 and the heater 4 are installed and arranged, the transformer simulation shell 11 is assembled, the ignition electrode 32 is inserted into a symmetrical fixing hole preset in the transformer simulation shell 11, the ignition electrode 32 is fixed after being adjusted to a proper distance, the first hole 115 and the second hole 116 of the transformer simulation shell 11 are respectively connected with the fuel supply pipeline 21 and the fuel recovery pipeline 22, and the adjusting bolt 26 is properly adjusted to enable the bearing frame 25 to be located at a proper height; the thermocouple is extended into the fixed bracket 12 and fixed; setting a data storage path to store temperature measurement data of the thermocouple;
step S02: adding a proper amount of transformer oil to be measured into the oil storage pool 23, and opening an electric control gate 27 on the fuel supply pipeline 21 to control the fuel to enter the transformer simulation shell 11 to reach the liquid level height which is calculated in advance;
step S03: then, turning on a switch of the electric heating furnace and a temperature adjusting knob 41 according to a preset scheme to adjust the heating rate, starting timing on the transformer oil in the transformer simulation shell 11 through a heating disc 42, and adjusting the initial oil temperature by controlling the heating power and the heating time;
step S04: after the experiment is started, the output voltage, the ignition power and the ignition time of the electric spark generator 31 in the electric spark generation assembly 3 are adjusted to adjust the ignition energy, and after the oil temperature reaches a set value and is stable, the ignition switch 313 is started to ignite; observing the ignition condition of the transformer oil, and recording the temperature change conditions of an oil layer inside the transformer simulation device and oil vapor above the transformer simulation device by using a thermocouple;
specifically, the method comprises the following steps: if the ignition switch 313 is ignited, the ignition switch is extinguished by using a fire extinguishing system after ignition occurs, the ignition energy and the ignition time are reduced, the ignition energy and the ignition step are repeatedly adjusted until the ignition phenomenon of the transformer oil cannot be observed under a certain low energy, the minimum ignition energy of the transformer oil to be detected under the initial oil temperature is further obtained, and data recorded by a first thermocouple above an oil layer in the previous experiment is used as the ignition temperature of the transformer oil;
if no ignition phenomenon is observed, increasing ignition energy and ignition time, repeatedly adjusting the ignition energy and the ignition step until the ignition phenomenon of the transformer oil is observed under a certain higher energy, further obtaining the minimum ignition energy of the transformer oil to be measured under the initial oil temperature, and taking data recorded by a first thermocouple above the oil layer as the ignition temperature of the transformer oil; recording time, transformer oil temperature and ignition energy in each test; then extinguishing the fire by adopting a fire extinguishing system;
step SO 5: when the flame is extinguished, cooling the transformer simulation assembly 1 to the initial temperature, changing the test working condition after the initial state is recovered, preparing for the next test, repeating the steps S02-S04, and recording the temperature and ignition energy of the transformer oil when the transformer oil is ignited at different initial temperatures; in the process of repeating the steps S02-S04, the transformer oil is ensured to be kept at the specified liquid level height and the initial oil temperature before each experiment;
step S06: after all tests are finished, the transformer oil is put out by adopting a fire extinguishing system, the fixed support 12 and the thermocouple are moved away, and after standing, an electric control gate 27 of the recycling fuel pipeline 22 is opened to recycle the transformer oil.
As shown in fig. 8, a graph of the thermocouple temperature variation curve of the oil part of the K150X transformer is shown;
the experimental procedure is as follows:
in the experiment, the distance between thermocouples of each group of thermocouple bundles is 50mm, 40L (334 mm thick) of K150X transformer oil is added into a transformer simulation shell 11, the first thermocouples above the oil layer are respectively T7, T19 and T31, the transformer oil is heated to 100 ℃ and then is ignited once every 5 ℃, the transformer oil is ignited after being ignited at 145 ℃, the oil temperature of the transformer oil at the same height in the transformer simulation shell 11 is basically the same, and the surface temperature measured by the T19 reaches 144 ℃, namely the ignition temperature of the transformer oil is 144 ℃.
The transformer oil ignition experimental device in the embodiment can simulate the ignition process of transformer oil in a transformer when being heated, so that the experimental credibility is improved; the surface and internal temperature changes and the ignition temperature of the transformer oil before and after ignition are measured, the consumption of oil vapor caused by external air flow and ignition test times in the experimental process is eliminated, the accuracy of ignition temperature measurement is improved, a thermocouple is removed in time after detection is finished, and the service life of a detection part is prolonged; the transformer oil temperature can reach the preset temperature through the heating device, the minimum ignition energy of transformer oil ignition at the preset temperature can be measured by utilizing the electric spark generating system, and then the ignition characteristic of the transformer oil is analyzed.
The above embodiments are only used to illustrate the technical solution of the present invention, and not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it should be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; such modifications and substitutions do not depart from the spirit and scope of the present invention in its corresponding aspects.
Claims (10)
1. The transformer oil ignition experimental device is characterized by comprising a transformer simulation assembly, an electric spark generation assembly for igniting transformer oil and a heater for heating the transformer oil;
the transformer simulation assembly comprises a transformer simulation shell and a plurality of temperature measurement pieces capable of measuring temperatures at different heights and positions, the temperature measurement pieces stretch into the transformer simulation shell, the electric spark generation assembly comprises an electric spark generator and an ignition electrode, the ignition electrode is connected with the electric spark generator, and the ignition electrode is connected to the wall of the transformer simulation shell and stretches into the transformer simulation shell.
2. The transformer oil ignition experiment device according to claim 1, wherein the transformer simulation shell comprises a first shell, a second shell and a base, the first shell and the second shell are detachably connected, a cavity for containing transformer oil is formed by the first shell and the second shell, the base is connected to the bottom of the second shell, and the heater is placed in the base.
3. The transformer oil ignition experiment device according to claim 2, wherein the second casing is a cavity with an opening at the top end, the first casing is a cavity with an opening at the bottom, a clamping plate is arranged at the bottom of the first casing, a clamping groove is arranged at the top of the second casing, and the clamping plate is clamped in the clamping groove.
4. The transformer oil ignition experiment device according to claim 2, further comprising a fixing bracket for fixing the temperature measuring part, wherein the top end of the first casing is provided with a plurality of through holes, the fixing bracket is of a tubular structure, and the fixing bracket is inserted into the through holes and extends out of the first casing.
5. The transformer oil ignition experiment device according to claim 4, wherein the fixed support is provided with a plurality of temperature measuring holes which are arranged at intervals, the plurality of temperature measuring pieces extend into the fixed support, and sensing ends of the temperature measuring pieces are located at the temperature measuring holes.
6. The transformer oil ignition experiment device according to claim 5, wherein the vertical distance between the temperature measuring holes is 40-60mm, and each fixing bracket is provided with 10-20 temperature measuring holes.
7. The transformer oil pilot experiment device of claim 2, wherein the side of the first housing has a plurality of bushing-simulating apertures communicating with the interior thereof; the side wall of the second housing also has an ignition electrode placement aperture for mounting an ignition electrode.
8. The transformer oil pilot experimental apparatus of claim 7, wherein the ignition electrode placing orifice is two small holes symmetrically arranged.
9. The transformer oil ignition experiment device according to claim 4, wherein the temperature measuring element is a thermocouple, and a thermocouple string consisting of a plurality of thermocouples is placed in the fixed support.
10. The transformer oil ignition test device of claim 1, wherein the spark generation assembly is located on one side of a transformer simulation assembly and the heater is located below the transformer simulation assembly.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113176290A (en) * | 2021-05-11 | 2021-07-27 | 国网安徽省电力有限公司电力科学研究院 | Transformer oil ignition experimental device and method |
| CN114924025A (en) * | 2022-06-02 | 2022-08-19 | 郑州轻工业大学 | Ignition device for igniting transformer oil flowing fire and working method thereof |
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2021
- 2021-05-11 CN CN202121005254.4U patent/CN214794649U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113176290A (en) * | 2021-05-11 | 2021-07-27 | 国网安徽省电力有限公司电力科学研究院 | Transformer oil ignition experimental device and method |
| CN114924025A (en) * | 2022-06-02 | 2022-08-19 | 郑州轻工业大学 | Ignition device for igniting transformer oil flowing fire and working method thereof |
| CN114924025B (en) * | 2022-06-02 | 2023-10-27 | 郑州轻工业大学 | Igniting device for igniting flowing fire of transformer oil and working method thereof |
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