CN114664514A - Converter transformer heat preservation method and system - Google Patents
Converter transformer heat preservation method and system Download PDFInfo
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- 239000012774 insulation material Substances 0.000 claims abstract description 9
- 238000009413 insulation Methods 0.000 claims description 48
- 238000010438 heat treatment Methods 0.000 claims description 45
- 229910000831 Steel Inorganic materials 0.000 claims description 34
- 239000010959 steel Substances 0.000 claims description 34
- 238000004804 winding Methods 0.000 claims description 32
- 238000002347 injection Methods 0.000 claims description 30
- 239000007924 injection Substances 0.000 claims description 30
- 239000000463 material Substances 0.000 claims description 13
- 239000002184 metal Substances 0.000 claims description 10
- 238000007789 sealing Methods 0.000 claims description 10
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F27/00—Details of transformers or inductances, in general
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F27/00—Details of transformers or inductances, in general
- H01F27/008—Details of transformers or inductances, in general with temperature compensation
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F27/00—Details of transformers or inductances, in general
- H01F27/08—Cooling; Ventilating
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Abstract
The invention discloses a heat preservation method and a heat preservation system for a converter transformer. Wherein, converter transformer's heat preservation system includes: a converter transformer body; the double-layer heat-insulating material is coated on the outer surface of the converter transformer body; wherein, double-deck insulation material includes: the first fireproof heat-preservation cotton is coated on the outer surface of the converter transformer body; and a sealed heat-insulating shed packaged at the outer side of the fireproof heat-insulating cotton. The technical scheme of the invention aims to solve the problem that the outlet oil temperature of the converter transformer body cannot reach the specified technical index under the condition of low external environment temperature in the prior art.
Description
Technical Field
The invention relates to the technical field of direct current transmission, in particular to a heat preservation method and a heat preservation system for a converter transformer.
Background
The converter transformer is the most core equipment of the direct current transmission project, and forms a heart of the converter station together with the converter valve, namely the converter station. The converter transformer has the main function of converting 750 kilovolt alternating current into +/-800 kilovolt direct current so as to realize long-distance, large-scale, high-efficiency and low-loss transmission of clean energy.
As one of the most important devices of the converter station, the converter transformer is characterized by large volume, heavy tonnage, high requirement on the surrounding environment, more installation process flows and large in-place difficulty coefficient; due to the characteristics, the whole installation process of the converter transformer needs a plurality of operations of body station entering and unloading, accessory installation, traction in place, vacuum pumping, vacuum oil injection, hot oil circulation, standing, testing and the like. After the high-end converter transformer and the field accessories thereof are installed, the whole length, width and height of the high-end converter transformer exceed 10 meters, and the total weight can reach above 560 tons.
Most of the existing converter transformers are located in high-altitude areas, have the characteristics of large temperature difference, much wind and sand, strong ultraviolet rays and the like, particularly have long cold time in winter, in the engineering construction of the extra-high voltage converter station, the construction interval of the high-end converter transformer is in the high-cold and low-temperature time period in winter, and in some areas with severe environment, the lowest temperature in winter can be lower than minus 20 ℃, and the temperature of the extra-high voltage converter transformer is not lower than 60 ℃ according to the relevant standard regulation of hot oil circulation in the installation process, so that the installation of the extra-high voltage converter transformer is seriously influenced.
When hot oil circulation operation is carried out outdoors in winter, under the condition that the external environment temperature of the converter transformer body is low, the heat of the converter transformer body is lost in the circulation process, and the technical index that the outlet oil temperature of the converter transformer specified by the standard can not reach 60 ℃ can not be met.
Disclosure of Invention
The invention provides a heat preservation method and a heat preservation system for a converter transformer, and aims to solve the problem that the outlet oil temperature of a converter transformer body cannot reach the specified technical index under the condition of low external environment temperature in the prior art.
In order to achieve the above object, the present invention provides a converter transformer thermal insulation system, including:
a converter transformer body;
the double-layer heat-insulating material is coated on the outer surface of the converter transformer body; wherein,
the double-layer heat-insulating material comprises:
the first fireproof heat-preservation cotton is coated on the outer surface of the converter transformer body; and the number of the first and second groups,
and the sealing heat-preservation shed is packaged at the outer side of the fireproof heat-preservation cotton.
Preferably, in the insulation system of the converter transformer, the sealed insulation shed includes:
the steel structure frame is packaged at the outer side of the fireproof heat-preservation cotton;
a wind-proof canvas layer covering the steel structure frame;
the steel grid structure is connected with the steel structure frame and arranged in a ground-attached mode;
and the second fireproof heat-preservation cotton covers the steel grid structure.
Preferably, the insulation system of the converter transformer further includes:
the industrial warm air gun is arranged inside the steel structure frame;
and the electric heater is arranged on the steel structure frame.
Preferably, the insulation system of the converter transformer further comprises:
the oil injection pipeline, the hot oil pipeline and the exhaust pipeline are communicated with the converter transformer body, wherein the oil injection pipeline, the hot oil pipeline and the exhaust pipeline are respectively made of metal hose materials;
and the heat-insulating rubber layer is coated on an oil injection pipeline, a hot oil pipeline and an exhaust pipeline of the metal hose material.
Preferably, converter transformer's heat preservation system still includes the series connection vacuum oil filter unit that is linked together with converter transformer body, and the series connection vacuum oil filter unit includes:
the vacuum pump is communicated with the gas outlet of the converter transformer body;
the first oiling tank, the first oil filter, the second oiling tank and the second oil filter are sequentially connected in series, and the second oil filter is further communicated with an oil tank of the converter transformer body.
Preferably, the insulation system of the converter transformer further comprises:
hot air blowers and dry air generators; and the number of the first and second groups,
the special heat-preservation shed is wrapped on the oil filter unit, the hot air fan and the dry air generator which are connected in series.
Preferably, the insulation system of the converter transformer further includes a hot oil circulating unit communicated with the converter transformer body, and the hot oil circulating unit includes:
the third oil filtering machine is communicated with an oil tank of the converter transformer body through the first hot oil pipeline and the first cold oil pipeline;
the fourth oil filter is communicated with the oil tank of the converter transformer body through a second hot oil pipeline and a second cold oil pipeline;
wherein, the third oil filter is connected with the fourth oil filter in parallel.
Preferably, the insulation system of the converter transformer further includes a low-frequency heating device communicated with the converter transformer body, and the low-frequency heating device includes:
the low-voltage power supply, the transformer, the variable-frequency power supply and the heated transformer winding are connected in sequence; wherein
The heated transformer winding is arranged inside the converter transformer body.
Preferably, the insulation system of the converter transformer, the heated transformer winding includes:
a grid side winding electrically connected to the variable frequency power supply, and,
and the valve side winding is connected with the grid side winding in an induction mode and is grounded through a short-circuit cable.
According to a second aspect of the present invention, the present invention further provides a method for preserving heat of a converter transformer, including:
sealing and insulating the converter transformer body by using a sealing and insulating shed and first fireproof insulating cotton;
heating the converter transformer body by using an industrial warm air cannon and an electric heater;
performing vacuum oil injection operation on the converter transformer body by using a series vacuum oil filter unit;
performing hot oil circulation treatment on the converter transformer body by using a hot oil circulation unit;
and carrying out low-frequency heating treatment on the converter transformer body by using a low-frequency heating device.
In summary, according to the heat preservation scheme of the converter transformer provided by the application, the double-layer heat preservation effect is achieved by coating the double-layer heat preservation material on the outer surface of the converter transformer body, and specifically, the first fireproof heat preservation cotton is directly coated on the outer surface of the converter transformer body, so that the effects of isolating external cold air and preserving heat are directly achieved; and set up sealed thermal-insulation shed in the cotton outside of fire prevention heat preservation, this thermal-insulation shed is sealed, can directly completely cut off outside cold air, even external environment temperature is lower like this, leads to double-deck insulation material and also can reduce the heat that changes the export oil temperature of current transformer body and scatter and disappear to under the lower condition of external environment temperature among the prior art, the export oil temperature of current transformer body is difficult to reach the problem of the technical index of regulation.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the structures shown in the drawings without creative efforts.
Fig. 1 is a schematic structural diagram of a heat preservation system of a converter transformer according to an embodiment of the present invention;
FIG. 2 is a schematic structural diagram of a sealed thermal insulation shed of a first converter transformer provided in the embodiment shown in FIG. 1;
FIG. 3 is a schematic structural diagram of a sealed thermal insulation shed of a second converter transformer provided in the embodiment shown in FIG. 1;
FIG. 4 is a schematic structural diagram of a series vacuum oil filter unit provided in the embodiment shown in FIG. 1;
FIG. 5 is a schematic view of a hot oil circulating unit according to the embodiment of FIG. 1;
FIG. 6 is a schematic structural diagram of a low-frequency heating apparatus provided in the embodiment shown in FIG. 1;
FIG. 7 is a wiring diagram of a low frequency heating apparatus provided in the embodiment of FIG. 1;
fig. 8 is a schematic flow chart of a method for maintaining the temperature of a converter transformer according to an embodiment of the present invention.
The implementation, functional features and advantages of the objects of the present invention will be further described with reference to the accompanying drawings.
Detailed Description
It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
It should be noted that all the directional indicators (such as upper, lower, left, right, front and rear … …) in the embodiment of the present invention are only used to explain the relative position relationship between the components, the motion situation, etc. in a specific posture (as shown in the drawing), and if the specific posture is changed, the directional indicator is changed accordingly.
In addition, the descriptions related to "first", "second", etc. in the present invention are only for descriptive purposes and are not to be construed as indicating or implying relative importance or implying any number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "a plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise.
In the present invention, unless otherwise expressly stated or limited, the terms "connected," "secured," and the like are to be construed broadly, and for example, "secured" may be a fixed connection, a removable connection, or an integral part; "connected" may be mechanically or electrically connected; they may be directly connected or indirectly connected through intervening media, or they may be connected internally or in any other suitable relationship, unless expressly stated otherwise. The specific meanings of the above terms in the present invention can be understood according to specific situations by those of ordinary skill in the art.
In addition, the technical solutions in the embodiments of the present invention may be combined with each other, but it must be based on the realization of those skilled in the art, and when the technical solutions are contradictory or cannot be realized, the combination of the technical solutions should be considered to be absent and not within the protection scope of the present invention.
The heat preservation scheme of the converter transformer provided by the following embodiments of the application has the following technical problems to be solved:
most of the existing converter transformers are located in high-altitude areas, have the characteristics of large temperature difference, much wind and sand, strong ultraviolet rays and the like, particularly have long cold time in winter, in the engineering construction of the extra-high voltage converter station, the construction interval of the high-end converter transformer is in the high-cold and low-temperature time period in winter, and in some areas with severe environment, the lowest temperature in winter can be lower than minus 20 ℃, and the temperature of the extra-high voltage converter transformer is not lower than 60 ℃ according to the relevant standard regulation of hot oil circulation in the installation process, so that the installation of the extra-high voltage converter transformer is seriously influenced.
When hot oil circulation operation is carried out outdoors in winter, under the condition that the external environment temperature of the converter transformer body is low, the heat of the converter transformer body is lost in the circulation process, and the technical index that the outlet oil temperature of the converter transformer specified by the standard can not reach 60 ℃ can not be met.
In order to achieve the above purpose, referring to fig. 1, fig. 1 is a schematic structural diagram of a heat preservation system of a converter transformer according to an embodiment of the present invention. As shown in fig. 1, the insulation system of the converter transformer includes:
a converter transformer body 1; as shown in fig. 1, the length, width and height of the high-end converter transformer body 1 can be more than 10 meters in normal conditions, and the total weight can reach more than 560 tons; and the converter transformer body 1 is usually arranged in a high-altitude and low-temperature environment, so that the heat preservation and protection of the converter transformer body 1 and the internal devices thereof are of great importance.
The double-layer heat-insulating material 2 is coated on the outer surface of the converter transformer body 1; through setting up double-deck insulation material 2, can play double-deck anti-cold, insulating heat retaining function, reduce the heat of the export oil temperature of current conversion transformer body 1 and scatter and disappear, solve among the prior art external environment temperature lower, the export oil temperature of current conversion transformer body 1 is difficult to reach the problem of specified technical index.
Wherein, double-deck insulation material 2 includes: the first fireproof heat-preservation cotton 201 is coated on the outer surface of the converter transformer body 1; first fire prevention keeps warm and covers 201 in the surface setting of the rheology body 1, and the cotton 201 material of first fire prevention keeps warm moreover is soft, can closely paste the rheology body 1 setting, and the heat that the rheology body 1 gived off is difficult to scatter and disappear like this to reach the heat retaining effect of the rheology body 1.
And a sealed thermal insulation shed 202 which is packaged outside the fireproof thermal insulation cotton. Sealed thermal-insulation shed 202 encapsulates in the cotton outside of fire prevention heat preservation to because sealed thermal-insulation shed 202 is sealed setting, consequently sealed thermal-insulation shed 202 can completely cut off outside cold air, makes to have the isolated heat preservation gas of one deck between converter transformer body 1 and the outside air, even external environment temperature is lower like this, double-deck insulation material 2 also can reduce the heat of the export oil temperature of converter transformer body 1 and scatter and disappear.
In summary, the heat preservation system of the converter transformer provided by the application achieves the double-layer heat preservation effect by coating the double-layer heat preservation material 2 on the outer surface of the converter transformer body 1, and specifically achieves the effects of isolating external cold air and preserving heat by directly coating the first fireproof heat preservation cotton 201 on the outer surface of the converter transformer body 1; and set up sealed thermal-insulation shed 202 in the cotton outside of fire prevention heat preservation, this thermal-insulation shed is sealed, can directly isolated outside cold air, even external environment temperature is lower like this, double-deck insulation material 2 also can reduce the heat of the export oil temperature of current conversion transformer body 1 and scatter and disappear to solve among the prior art under the lower condition of external environment temperature, the export oil temperature of current conversion transformer body 1 is difficult to reach the problem of specified technical indicator.
As a preferred embodiment, as shown in fig. 2 and 3, in the insulation system of the converter transformer, the sealed insulation shed 202 includes:
a steel structure frame 2021 which is packaged at the outer side of the fireproof heat preservation cotton; preferably, the steel frame 2021 can be a box-in noise reducing steel structure, which can form a "room" for insulation.
A windproof canvas layer 2022 covering the steel structure frame 2021; the flow of gas in the steel structure frame 2021 can be reduced by covering the windproof canvas layer 2022, thereby reducing the heat dissipation efficiency.
A steel grid structure 2023 connected to the steel structure frame 2021 and disposed in close proximity to the ground;
and a second fireproof heat-insulating cotton 2024 covering the steel grid structure 2023. Through setting up steel grid structure 2023 on ground to lay second fire prevention heat preservation cotton 2024 on steel grid structure 2023, can further reduce the heat that changes current transformer body 1 and lose along ground transmission, thereby reach the heat preservation effect to change current transformer body 1.
In the sealed thermal insulation shed 202 provided by the embodiment of the application, the windproof canvas layer 2022 is covered on the steel structure frame 2021 to reduce the heat dissipation efficiency, and the steel grid structure 2023 which is connected with the steel structure frame 2021 and is arranged in a manner of being attached to the ground is arranged, so that the whole converter transformer body 1 can be sealed, the second fireproof thermal insulation cotton 2024 is laid on the steel grid structure 2023, the heat dissipated along the ground of the converter transformer body 1 can be further reduced, and the thermal insulation effect of the converter transformer body 1 is achieved.
As a preferred embodiment, as shown in fig. 2, the insulation system of the converter transformer further includes:
the industrial warm air gun 3 is arranged inside the steel structure frame 2021;
and the electric heater 4 is arranged on the steel structure frame 2021.
The industrial warm air cannon 3 is arranged between the steel structure frame 2021 and the converter transformer body 1, 4 industrial warm air cannons 3 of 30kW are arranged at four corners inside the box-in steel structure frame 2021, and 10 electric heaters 4 of 2kW are arranged on two sides inside the steel structure frame 2021 for continuous temperature rise, so that the temperature in the shed is kept at 25-30 ℃. Through setting up industrial warm braw big gun 3 and electric heater, can heat the air between steel structural framework 2021 and the change current transformer body 1 to reduce the heat of change current transformer body 1 and scatter and disappear, improve the heat preservation efficiency of change current transformer body 1.
As a preferred embodiment, as shown in fig. 4, the insulation system of a converter transformer according to the embodiment of the present application further includes:
the oil injection pipeline 5, the hot oil pipeline 6 and the exhaust pipeline 7 are communicated with the converter transformer body 1, wherein the oil injection pipeline 5, the hot oil pipeline 6 and the exhaust pipeline 7 are made of metal hose materials respectively;
and the heat-insulating rubber layer 8 is coated on the oil injection pipeline 5, the hot oil pipeline 6 and the exhaust pipeline 7 of the metal hose material.
In the heat insulation system of the converter transformer body 1 provided by the embodiment of the application, the oil injection pipeline 5, the hot oil pipeline 6 and the exhaust pipeline 7 are made of metal hose materials, so that the heat dissipation efficiency can be reduced, and the heat insulation rubber layer 8 is coated on the outer layer of the metal hose materials, so that the heat dissipation efficiency of oil gas in the transmission process can be reduced. The basic isolation of the oil pipe from the atmosphere can be realized by comprehensively wrapping the pipeline for vacuumizing, oil injection and hot oil circulation. In cold environment in winter, the injection pipe, the vacuum pump 901 (dry gas generator) and the gas injection pipe have the hidden danger of frost cracking, which easily causes the phenomena of large-area gas leakage and oil leakage on site, so all the oil pipes and the gas pipes are in the form of metal flexible pipes; in addition, the metal hose is completely wrapped by the heat-insulating rubber material, so that accidents in severe cold weather can be avoided.
As a preferred embodiment, as shown in fig. 4, the insulation system of the converter transformer provided in the embodiment of the present application further includes a series vacuum oil filter set 9 communicated with the converter transformer body 1; the series vacuum oil filter unit 9 achieves the purpose of twice low-frequency heating by arranging two oil injection tanks and two oil filters.
Specifically, the series vacuum oil filter unit 9 includes:
a vacuum pump 901 communicated with the gas outlet of the converter transformer body 1; the vacuum pump 901 is communicated with the air outlet of the oil tank 101 of the converter transformer body 1, so that the oil tank 101 can be pumped into a vacuum state, and oil can be filled through the vacuum adsorption effect.
The oil filter comprises a first oil tank 902, a first oil filter 903, a second oil tank 904 and a second oil filter 905 which are sequentially connected in series, wherein the second oil filter 905 is also communicated with the oil tank 101 of the converter transformer body 1.
In the technical scheme provided by the embodiment of the application, the converter transformer 1402 is subjected to oil injection operation by a double-machine double-tank oil injection method, air in the oil tank 101 is firstly pumped out through the vacuum pump 901, so that oil is absorbed through a vacuum adsorption effect, and oil is injected into the oil tank 101 of the converter transformer body 1 in sequence through the first oil injection tank 902, the first oil filter 903, the second oil injection tank 904 and the second oil filter 905 which are connected in series in sequence. Because the oil filters are provided with heating devices such as heating rods, the purpose of heating twice can be achieved by connecting the oil filters in series, and the construction method of directly injecting oil into 1 oil filter is replaced by adopting the mode of matching 2 oil filters and 2 oil injection tanks, so that the oil injection temperature can be increased to 60 ℃.
As a preferred embodiment, as shown in fig. 4, the insulation system of a converter transformer according to the embodiment of the present application further includes:
a hot air blower 10 and a dry air generator 11; and a special heat-insulating shed 12 which is wrapped on the vacuum oil filter unit 9, the hot air blower 10 and the dry air generator 11 which are connected in series.
In the technical scheme provided by the embodiment of the application, the special heat-insulating shed 12 is wrapped on the series oil filter unit, the hot air blower 10 and the drying generator, so that the heat loss of the devices can be reduced. Specifically, as shown in fig. 5, by setting up a dedicated heat insulation shed 12, during on-site construction, the oil filter and the vacuum pump 901 in the series oil filter unit are respectively supplied, the dry air generator 11 and the hot air heater 10 are wired for use, and the heat insulation shed is heated by the electric heater 4, the hot air heater and the like, so that normal operation of the machine can be ensured.
As a preferred embodiment, as shown in fig. 5, the insulation system of the converter transformer according to the embodiment of the present application further includes a hot oil circulating unit 13 communicated with the converter transformer body 1, where the hot oil circulating unit 13 includes:
the third oil filter 1303 is communicated with the oil tank 101 of the converter transformer body 1 through the first hot oil pipeline 1301 and the first cold oil pipeline 1302;
the fourth oil filter 1306 is communicated with the oil tank 101 of the converter transformer body 1 through a second hot oil pipeline 1304 and a second cold oil pipeline 1305;
wherein the third oil filter 1303 and the fourth oil filter 1306 are connected in parallel.
Specifically, in the heat preservation system of the converter transformer provided in the embodiment of the present application, the hot oil circulating unit 13 employs a large high vacuum oil filter unit with an oil processing capacity of 20000L/h as the third oil filter 1303 to circulate hot oil, the heating power of the heater of the third oil filter 1303 is 216kW, and one oil filter, namely the fourth oil filter 1306, is reserved while considering the extreme low temperature weather of part of converter stations; if the heating effect is not good, two oil filters are used in parallel to accelerate the heating speed. Wherein, the heating power of a single heater in the 20000L/h vacuum oil filter unit is 210kW, the heating power of a single heater in the 12000L/h high vacuum oil filter unit is 180kW, and the total heating power of 2 heaters is 390 kW.
As a preferred embodiment, the insulation system of the converter transformer provided in the above embodiment further includes a low-frequency heating device 14 communicated with the converter transformer body 1, as shown in fig. 6, fig. 6 is a schematic structural diagram of the low-frequency heating device provided in the embodiment shown in fig. 1, where the low-frequency heating device 14 includes:
a low-voltage power supply 1401, a transformer 1402, a variable-frequency power supply 1403 and a heated transformer winding 1404 which are connected in sequence; wherein,
the heated transformer winding 1404 is provided inside the converter body 1.
Low frequency heating of transformer 1402 is an internal heating method that generates heat by passing current through the windings' resistance. The heated transformer winding 1404 is short-circuited by selecting a suitable winding (usually a low-voltage or medium-voltage winding) on one side, and excited by applying an ultralow frequency (0.01 to 1Hz) voltage to a winding (usually a high-voltage winding) on the other side, so that induced currents are generated on the windings on both sides, and the resistance of the winding generates heat.
The short-circuit impedance of the transformer 1402 is very small (usually much smaller than at power frequency, since the value of the leakage reactance component in the impedance is proportional to the frequency and decreases sharply with respect to power frequency) due to the low frequency of the applied voltage. The short circuit impedance is dominated by the resistive component and the inductive component is almost negligible (below 1/3 of the resistive component), at this time, the circuit almost presents the pure resistive characteristic (actually, the circuit still has weak inductance), the resistance value is very small, and a very low voltage is applied to obtain a large current for heating, so that the intermediate step-up test transformer 1402 is not needed. Meanwhile, because the inductive component of the circuit is small, compared with the traditional power frequency test condition, a large number of compensation devices (mainly capacitors) can be omitted. In addition, the coil is heated from inside to outside and has high power, high internal temperature of the coil and good insulating and drying treatment quality; the heating space is large, the heating is uniform, the heating efficiency is high, the heating time is greatly shortened, the insulating drying treatment process (hot oil circulation) of the transformer 1402 can be remarkably accelerated, the field installation and construction period of the transformer 1402 is shortened, and the working efficiency is improved.
As a preferred embodiment, referring to fig. 7, fig. 7 is a connection diagram of a low frequency heating apparatus provided in the embodiment shown in fig. 1. As shown in fig. 7, in the low frequency heating apparatus provided in the embodiment of the present application, the heated transformer winding 1404 includes:
a grid side winding 14041 electrically connected to the variable frequency power supply 1403, and,
valve side winding 14042, inductively coupled to net side winding 14041, valve side winding 14042 is grounded via shorting cable 14043.
In the technical scheme provided by the embodiment of the application, through calculation, the negative limit tapping 31 gear of the converter transformer on the network side winding can obtain relatively large heating power, so that a low-frequency heating test is carried out by adopting the tapping switch 31 gear of the network side winding. In addition, according to parameter calculation, a heating connecting wire mode of pressurizing on the network side and short-circuiting on the valve side is selected, and good impedance matching with the low-frequency heating device 14 can be achieved.
In addition, as a preferred embodiment, as shown in fig. 7, in the technical solution provided in the embodiment of the present application, the low frequency heating power source obtains power from a 400V low voltage distribution room, the output is connected to the network side bushing and the neutral point terminal of the converter transformer body 1, and the two bushings of the valve side winding 14042 are short-circuited.
In conclusion, the technical scheme provided by the application is applied to +/-800 kV converter station engineering, the installation quality of the converter transformer is improved, the installation period of the converter transformer is shortened, the field installation of the high-end converter transformer in winter not only realizes progress control, the quality level is obviously improved, the working environment is greatly improved, the labor cost is saved, and the technical scheme has obvious technical advantages and economic benefits.
Through actual contrast, from heat preservation effect and economic nature, it is better than the heat preservation effect and the economic benefits who sets up large-scale heat preservation canopy from dual heat preservation method, consequently the conversion current transformer of winter construction keeps warm and adopts the double heat preservation method of body, guarantees product quality when satisfying the on-the-spot installation progress, and the conversion current transformer passes through oil appearance and detects smoothly.
The hot oil circulation method mainly adopted at present still has the defects of low efficiency, long treatment time and the like, and particularly under the low-temperature environment, the expected heating target cannot be achieved due to the limitation of equipment power, and the insulation treatment effect is influenced. The power of the low-frequency heating device 14 can reach 1250kW at most, and the heating efficiency is improved by utilizing the short-circuit loss of the winding to heat from the inside of the equipment.
In conclusion, the heat preservation system of the converter transformer provided by the technical scheme of the application is applied to +/-800 kV converter station engineering, the installation work of 12 high-end converter transformers in winter is completed, the installation quality of the converter transformer is improved, the installation period of the converter transformer is shortened, the installation of the converter transformer in winter under severe weather conditions such as low temperature and low pressure in winter on plateau is realized, and a solid foundation is laid for ensuring the construction quality, improving the work efficiency and saving the cost.
Based on the same concept of the above method embodiment, the embodiment of the present invention further provides a heat preservation method for a converter transformer, which is used for implementing the functions of the above system of the present invention.
Referring to fig. 8, fig. 8 is a schematic flow chart of a method for maintaining the temperature of a converter transformer according to an embodiment of the present invention. As shown in fig. 8, the method for maintaining the temperature of the converter transformer includes the following steps:
s110: carrying out sealing heat preservation treatment on the converter transformer body by using a sealing heat preservation shed and first fireproof heat preservation cotton;
s120: heating the converter transformer body by using an industrial warm air cannon and an electric heater;
s130: performing vacuum oil injection operation on the converter transformer body by using a series vacuum oil filter unit;
s140: performing hot oil circulation treatment on the converter transformer body by using a hot oil circulation unit;
s150: performing low-frequency heating treatment on the converter transformer body by using a low-frequency heating device;
in summary, according to the insulation scheme of the converter transformer provided by the above embodiment of the present application, the control standard of the applied working fluid in winter is as follows:
1) vacuumizing to 133Pa, and testing the leakage rate of the converter transformer; and after the leakage test is qualified, continuously pumping the vacuum degree to 13Pa, and keeping the vacuum degree for not less than 48 h.
2) The vacuum is kept in the whole oil injection process, and the temperature of the injected oil is preferably higher than the temperature of the vessel body. The oil injection speed is controlled to be 4 t/h-6 t/h.
3) The vacuum oil injection work is not suitable for being carried out in rainy days and foggy days so as to prevent moisture and humidity from entering the oil tank when the sealing is poor.
4) After the vacuum oil injection is finished, hot oil circulation needs to be carried out on the converter transformer, before the hot oil circulation, the oil pipe needs to be vacuumized, air in the oil pipe is pumped out, meanwhile, oil in the cooler and oil in the oil tank main body need to be simultaneously subjected to the hot oil circulation, the total oil quantity of the circulation is more than or equal to 3 times of the total oil quantity of the converter transformer, and the total oil quantity of the converter transformer is not less than 48 hours.
5) Sealing test: the tightness test is carried out by adopting oil pressure or air pressure according to the technical file requirements of manufacturers, and no leakage exists.
6) After the oil injection is finished, the standing time of the oil injection is not less than 96h before the voltage is applied.
In summary, according to the heat preservation method of the converter transformer provided by the application, the double-layer heat preservation effect is achieved by coating the double-layer heat preservation material on the outer surface of the converter transformer body, and specifically, the first fireproof heat preservation cotton is directly coated on the outer surface of the converter transformer body, so that the effects of isolating external cold air and preserving heat are directly achieved; and set up sealed heat preservation canopy in the cotton outside of fire prevention heat preservation, this heat preservation canopy is sealed, can directly isolated outside cold air, even external environment temperature is lower like this, leads to double-deck insulation material and also can reduce the heat of the export oil temperature of current conversion transformer body and scatter and disappear to under the lower condition of external environment temperature among the prior art, the export oil temperature of current conversion transformer body is difficult to reach the problem of specified technical index.
While preferred embodiments of the present invention have been described, additional variations and modifications in those embodiments may occur to those skilled in the art once they learn of the basic inventive concepts. It is therefore intended that the appended claims be interpreted as including the preferred embodiment and all such alterations and modifications as fall within the scope of the invention.
It will be apparent to those skilled in the art that various changes and modifications may be made in the present invention without departing from the spirit and scope of the invention. Thus, if such modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include such modifications and variations.
Claims (10)
1. A converter transformer's heat preservation system characterized in that includes:
a converter transformer body (1);
the double-layer heat insulation material (2) is coated on the outer surface of the converter transformer body (1); wherein the double-layer thermal insulation material (2) comprises:
the first fireproof heat-preservation cotton (201) is coated on the outer surface of the converter transformer body (1); and the number of the first and second groups,
and the sealing heat-preservation shed (202) is packaged at the outer side of the fireproof heat-preservation cotton (201).
2. The insulation system for a converter transformer according to claim 1, wherein said sealed insulation booth (202) comprises:
a steel structure frame (2021) packaged at the outer side of the fireproof heat-preservation cotton (201);
a windproof canvas layer (2022) covering the steel structure frame (2021);
a steel grid structure (2023) which is connected with the steel structure frame (2021) and is arranged in a clinging manner;
and a second fireproof heat-preservation cotton (2024) covering the steel grid structure (2023).
3. The insulation system for a converter transformer according to claim 2, further comprising:
the industrial warm air cannon (3) is arranged inside the steel structure frame (2021);
and the electric heater (4) is arranged on the steel structure frame (2021).
4. The insulation system for a converter transformer according to claim 1, further comprising:
the oil injection pipeline (5), the hot oil pipeline (6) and the exhaust pipeline (7) are communicated with the converter transformer body (1), wherein the oil injection pipeline (5), the hot oil pipeline (6) and the exhaust pipeline (7) are made of metal hose materials respectively;
and the heat-insulating rubber layer (8) is coated on the oil injection pipeline (5), the hot oil pipeline (6) and the exhaust pipeline (7) of the metal hose material.
5. The insulation system of the converter transformer according to claim 1, further comprising a series vacuum oil filter set (9) communicated with the converter transformer body (1), wherein the series vacuum oil filter set (9) comprises:
the vacuum pump (901) is communicated with the air outlet of the converter transformer body (1);
the oil filter comprises a first oil filling tank (902), a first oil filter (903), a second oil filling tank (904) and a second oil filter (905) which are sequentially connected in series, wherein the second oil filter (905) is also communicated with an oil tank (101) of the converter transformer body (1).
6. The insulation system for a converter transformer according to claim 5, further comprising:
a hot air blower (10) and a dry air generator (11); and the number of the first and second groups,
and the special heat-preservation shed (12) is wrapped on the series vacuum oil filter unit (9), the hot air blower (10) and the dry air generator (11).
7. The insulation system of the converter transformer according to claim 1, further comprising a hot oil circulator (13) in communication with the converter transformer body (1), wherein the hot oil circulator (13) comprises:
the third oil filter (1303) is communicated with the oil tank (101) of the converter transformer body (1) through a first hot oil pipeline (1301) and a first cold oil pipeline (1302);
the fourth oil filter (1306) is communicated with the oil tank (101) of the converter transformer body (1) through a second hot oil pipeline (1304) and a second cold oil pipeline (1305);
wherein the third oil filter (1303) is in parallel relationship with the fourth oil filter (1306).
8. The insulation system for the converter transformer according to claim 1, further comprising a low frequency heating device (14) communicated with the converter transformer body (1), wherein the low frequency heating device (14) comprises:
the low-voltage power supply (1401), the transformer (1402), the variable-frequency power supply (1403) and the heated transformer winding (1404) are connected in sequence; wherein
The heated transformer winding (1404) is disposed inside the converter transformer body (1).
9. The converter transformer insulation system according to claim 8, wherein the heated transformer winding (1404) comprises:
a grid side winding (14041) electrically connected to the variable frequency power supply (1403), and,
a valve side winding (14042) inductively coupled to the net side winding (14041), the valve side winding (14042) being grounded through a shorting cable (14043).
10. A heat preservation method of a converter transformer is characterized by comprising the following steps:
carrying out sealing heat preservation treatment on the converter transformer body by using a sealing heat preservation shed and first fireproof heat preservation cotton;
heating the converter transformer body by using an industrial warm air cannon and an electric heater;
performing vacuum oil injection operation on the converter transformer body by using a series vacuum oil filter unit;
performing hot oil circulation treatment on the converter transformer body by using a hot oil circulating unit;
and carrying out low-frequency heating treatment on the converter transformer body by using a low-frequency heating device.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210134681.5A CN114664514A (en) | 2022-02-14 | 2022-02-14 | Converter transformer heat preservation method and system |
| PCT/CN2022/118660 WO2023151273A1 (en) | 2022-02-14 | 2022-09-14 | Heat preservation method and system for converter transformer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210134681.5A CN114664514A (en) | 2022-02-14 | 2022-02-14 | Converter transformer heat preservation method and system |
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| CN114664514A true CN114664514A (en) | 2022-06-24 |
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| CN202210134681.5A Pending CN114664514A (en) | 2022-02-14 | 2022-02-14 | Converter transformer heat preservation method and system |
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| WO (1) | WO2023151273A1 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2023151273A1 (en) * | 2022-02-14 | 2023-08-17 | 青海送变电工程有限公司 | Heat preservation method and system for converter transformer |
Family Cites Families (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6300597B1 (en) * | 1997-01-21 | 2001-10-09 | Myoung Jun Lee | Electromagnetic field shielding electric heating pad |
| CN104103409B (en) * | 2014-06-20 | 2016-08-17 | 中国南方电网有限责任公司超高压输电公司检修试验中心 | The field drying processing method of converter power transformer |
| CN104332284A (en) * | 2014-10-16 | 2015-02-04 | 中国南方电网有限责任公司超高压输电公司天生桥局 | Hot oil spray and drying device and method for converter transformer |
| CN204516538U (en) * | 2015-03-25 | 2015-07-29 | 刘续磊 | Rainproof, anti-cryogenic transformer protective device |
| CN105909002B (en) * | 2016-04-14 | 2019-01-18 | 国家电网公司 | The heat preserving method of roof insulating for special (super) high voltage reactor installation |
| CN206961671U (en) * | 2017-06-30 | 2018-02-02 | 河南送变电建设有限公司 | A kind of ultra-high voltage transformer station transformer winter construction attemperator |
| CN114664514A (en) * | 2022-02-14 | 2022-06-24 | 青海送变电工程有限公司 | Converter transformer heat preservation method and system |
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2022
- 2022-02-14 CN CN202210134681.5A patent/CN114664514A/en active Pending
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2023151273A1 (en) * | 2022-02-14 | 2023-08-17 | 青海送变电工程有限公司 | Heat preservation method and system for converter transformer |
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