CN105909003A - Thermal insulation wall thickness adjusting method for thermal insulation shelf used for special (ultra) high voltage electric reactor mounting in alpine region - Google Patents

Abstract

The invention discloses a method for adjusting the thickness of the heat preservation wall of a heat preservation shed used for the installation of a special (ultra) high voltage transformer in an alpine region, and relates to the technical field of electric equipment installation in an alpine region. construction cost. The method for adjusting the thickness of the insulation wall of the insulation shed used for the installation of the extra (ultra) high voltage transformer in the alpine region includes: obtaining the heating power P of the heater and the heat dissipation _qd of the ground in the insulation shed per unit time to determine the temperature of the insulation shed The heat dissipation q _t of the shed per unit time, and further determine the thickness of the insulation wall according to the relevant heat conduction parameters of the insulation wall. The method for adjusting the thickness of the insulation wall of the insulation shed used for the installation of the ultra-(ultra) high voltage transformer in the alpine region provided by the present invention is used to determine the wall thickness of the insulation shed when building the insulation shed for the ultra-(ultra) high voltage transformer in the alpine region.

Description

Method for adjusting thickness of thermal insulation wall of thermal insulation shed for mounting ultra (ultra) high voltage transformer in alpine region

Technical Field

The invention relates to the technical field of installation of electrical equipment in alpine regions, in particular to a method for adjusting the thickness of a heat-insulating wall body of a heat-insulating shed of an ultra (ultra) high-voltage transformer in the alpine regions.

Background

In recent years, with the aggravation of environmental pollution, more and more haze weather appears, and the normal life of people is seriously influenced. In order to prevent and control haze, the nation proposes a plan for controlling haze by trans-regional power transmission, and trans-regional power transmission is long-distance power transmission and needs to adopt power transmission modes such as ultra (ultra) high voltage and the like, so that great development opportunity is provided for ultra (ultra) high voltage engineering.

In China, energy sources in inner Mongolia autonomous regions, Heilongjiang, Jilin, Xinjiang and other regions are rich, and extra (ultra) high-voltage power grid construction is greatly promoted in the regions, so that the power grid can play an important role in transregional power transmission. The areas are in high and cold areas, and the installation time of the ultra (ultra) high voltage transformer in the construction process of the ultra (ultra) high voltage transformer substation spans the whole winter; therefore, the construction process of the extra (ultra) high voltage transformer substation needs to face the original technical problem and also needs to meet the requirement of the extra (ultra) high voltage transformer in the high and cold low temperature area on the environmental temperature during the winter construction.

For example: in the process of installing the ultra (ultra) high-voltage transformer, the requirement of insulating oil in the ultra (ultra) high-voltage transformer is high, the index requirement is high, and the hot oil circulation temperature of the insulating oil must reach 65 +/-5 ℃ so that the transformer can be normally installed; however, the winter outdoor environment temperature in the alpine region is usually below-20 ℃, so that the temperature difference between the winter outdoor environment temperature in the alpine region and the hot oil circulation temperature of the insulating oil reaches more than 80 ℃, the heat loss of the insulating oil is serious, and the installation and subsequent operation stability of the ultra (ultra) high voltage transformer are affected.

In order to meet the installation and working requirements of the extra (ultra) high-voltage transformer in the severe cold environment, a thermal insulation shed needs to be erected for the extra (ultra) high-voltage transformer so as to ensure that the extra (ultra) high-voltage transformer can be installed and work under proper conditions; however, some existing national standards and enterprise standards only provide corresponding regulations for installation and test of electrical equipment, and do not provide regulations on temperature requirements during the installation process of the ultra (ultra) high-voltage transformer; therefore, when the heat preservation shed is built, the structural parameters of the heat preservation shed are difficult to determine, and the thickness of the heat preservation wall body of the heat preservation shed is possibly too small, so that the temperature in the heat preservation shed is difficult to ensure; or the thickness of the heat insulation wall body of the heat insulation shed is overlarge, so that the heat insulation requirement of the heat insulation shed is met, the waste of materials is caused, and the construction cost of the heat insulation shed is increased.

Disclosure of Invention

The invention aims to provide a method for adjusting the thickness of a heat-insulating wall body of a special (ultra) high-voltage transformer heat-insulating shed in a severe cold area, which is used for reducing the construction cost of the heat-insulating shed while the heat-insulating shed meets the heat-insulating requirement.

In order to achieve the above purpose, the invention provides the following technical scheme:

a method for adjusting the thickness of a heat preservation wall of a heat preservation shed for installing an ultra (ultra) high voltage transformer in a severe cold area comprises a wall and a ceiling arranged on the wall, wherein the wall comprises the heat preservation wall, a heater is arranged in the heat preservation shed, and the heating power P of the heater is controlled so that the heater heats the heat preservation shed to a target temperature T in the shed of the heat preservation shed_nAnd maintaining the temperature in the heat preservation shed at the target temperature in the shed; the method for adjusting the thickness of the heat-insulating wall comprises the following steps:

obtaining the heating power P of the heater and the heat dissipating capacity q of the ground in the heat preservation shed in unit time_d(ii) a According to the heating power P of the heater and the heat dissipating capacity q of the ground in the heat preservation shed in unit time_dDetermining the heat dissipating capacity q of the thermal insulation shed body in unit time_p(ii) a Wherein q is_p＝P-q_d；

Obtaining the internal surface area A of the greenhouse body of the heat preservation greenhouse₁Target temperature T in the shed_nAnd the outside environmental temperature T of the thermal insulation shed_wAccording to the heat dissipating capacity q of the thermal insulation shed body in unit time_pInternal surface area A of greenhouse body of heat-insulating greenhouse₁Target temperature T in the shed_nAnd the outside environmental temperature T of the thermal insulation shed_wDetermining the target heat transfer coefficient K of the thermal insulation shed₁Wherein

Obtaining the heat exchange coefficient a of the inner surface of the greenhouse body of the heat-preservation greenhouse_nExternal surface of greenhouse body of thermal insulation greenhouseCoefficient of heat transfer a_wAnd the thermal conductivity coefficient lambda of the material used for the thermal insulation wall, determining the thickness of the thermal insulation wall, wherein

Preferably, the heat dissipating capacity q per unit time of the ground in the heat-insulating shed_dThe obtaining method comprises the following steps:

obtaining a target temperature T in the greenhouse_nExternal environment temperature T of heat preservation shed_wGround area A in the greenhouse of the heat preservation greenhouse₂And the ground heat transfer coefficient K in the greenhouse of the heat preservation shed₂According to the target temperature T in the greenhouse_nExternal environment temperature T of heat preservation shed_wThe ground area A in the shed₂Heat transfer coefficient K of ground in shed₂Determining the heat dissipation capacity q of the ground in the heat preservation shed in unit time_dWherein q is_d＝K₂A₂(T_n-T_w)。

Preferably, the number k of the heat-insulating walls is at least two, and each heat-insulating wall comprises i layers of heat-insulating parts arranged along the height direction of the heat-insulating shed;

$\frac{\mathrm{\δ}}{\mathrm{\λ}}=\mathrm{\Σ}\frac{{\mathrm{\δ}}_i}{{\mathrm{\λ}}_i};$

the thickness of the heat-insulating wall body comprises the thickness of each heat-insulating part in the heat-insulating wall body_i；

The heat conductivity coefficient lambda of the material used for the heat-insulating wall body comprises the heat conductivity coefficient lambda of the material used for the heat-insulating part in each heat-insulating wall body_i。

Preferably, when the thermal insulation shelf is temperature-controlled using three heaters, the positions of the three heaters and the heating temperatures satisfy the following equations.

$T_3=T_2+(T_1-T_2)\frac{1/R_3-1/R_2}{1/R_1-1/R_2};$

Wherein,

R₁is the distance from the reference position to the first heater;

R₂is the distance from the reference position to the second heater;

R₃is the distance from the reference position to the third heater;

T₁is the heating temperature of the first heater;

T₂is the heating temperature of the second heater;

T₃is the heating temperature of the third heater.

Compared with the prior art, the temperature control method for the heat preservation shed for installing the ultra (ultra) high voltage transformer in the alpine region has the following beneficial effects:

in the method for adjusting the thickness of the heat insulation wall of the heat insulation shed for installing the ultra (ultra) high voltage transformer in the alpine region, the temperature in the heat insulation shed is obtained and maintained at the target temperature T in the shed_nIn the meantime, the heating power P of the heater and the heat dissipating capacity q of the ground in the heat-insulating shed in unit time_dTo determine the heat dissipating capacity q of the thermal insulation shed body in unit time_p(ii) a And obtains the heat dissipating capacity q of the thermal insulation shed body in unit time_pInternal surface area A of greenhouse body of heat-insulating greenhouse₁Target temperature T in the shed_nAnd the outside environmental temperature T of the thermal insulation shed_wDetermining the target heat transfer coefficient K of the thermal insulation shed₁(ii) a Finally, obtaining the target heat transfer coefficient K of the heat preservation shed₁Heat-insulating shed body internal surface heat-exchange coefficient a_nHeat-exchange coefficient a of external surface of thermal-insulating shed_wAnd the thermal conductivity coefficient lambda of the material used by the thermal insulation wall body, so as to determine the thickness of the thermal insulation wall body; therefore, the thickness of the heat preservation wall body of the heat preservation shed can be determined according to the heating power of the heater, the heat dissipation capacity of the shed body of the heat preservation shed in unit time and the heat dissipation capacity of the ground in the shed of the heat preservation shed in unit time, the waste of materials caused by overlarge thickness of the heat preservation wall body is avoided, or the heat preservation performance of the heat preservation shed is reduced caused by undersize thickness, so that the heat preservation shed can meet the heat preservation requirement, and meanwhile, the construction cost of the heat preservation shed is reduced.

Drawings

The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the invention and not to limit the invention. In the drawings:

FIG. 1 is a schematic structural view of a thermal insulation shed for an extra (ultra) high voltage transformer in an alpine region according to an embodiment of the present invention;

fig. 2 is an overall flowchart of a method for adjusting the thickness of a thermal insulation wall of a thermal insulation shed for installing an extra (ultra) high-voltage transformer in an alpine region according to an embodiment of the present invention;

FIG. 3 is a flow chart showing the heat dissipation capacity per unit time of the ground in the heat-insulating shed in the practice of the present invention;

FIG. 4 is a schematic view of the structure of a thermal insulation wall including three layers of thermal insulation sections in the practice of the present invention;

reference numerals:

1-heat preservation wall body, 11-heat preservation part;

2-ceiling, 3-heater;

4-super high voltage transformer.

Detailed Description

In order to further explain the thickness adjusting method of the thermal insulation wall of the thermal insulation shed for installing the ultra (ultra) high voltage transformer in the alpine region, which is provided by the embodiment of the invention, the following detailed description is made in combination with the attached drawings of the specification.

Referring to fig. 1, in the embodiment of the present invention, the thermal insulation booth includes an enclosure and a ceiling 2 disposed on the enclosure, the enclosure includes a thermal insulation wall 1, and a heater 3 is disposed in the thermal insulation booth; by controlling the heating power P of the heater 3, the heater 3 can heat the heat-preservation shed to the target temperature T in the heat-preservation shed_nAnd the temperature in the greenhouse of the heat preservation greenhouse is maintained at the target temperature in the greenhouse.

Referring to fig. 2, a method for adjusting a thickness of a thermal insulation wall of a thermal insulation shed for installing an extra (ultra) high voltage transformer in an alpine region according to an embodiment of the present invention includes:

s100: obtaining the heating power P of the heater 3 and the heat dissipating capacity q of the ground in the heat-preservation shed in unit time_d；

S200: according to the heating power P of the heater 3 and the heat dissipating capacity q of the ground in the heat-insulating shed in unit time_dDetermining the heat dissipating capacity q of the thermal insulation shed body in unit time_pWherein q is_p＝P-q_d；

S300: obtaining the internal surface area A of the greenhouse body of the heat preservation greenhouse₁Target temperature T in the shed_nAnd the outside environmental temperature T of the thermal insulation shed_w；

S400: according to the heat dissipating capacity q of the thermal insulation shed body in unit time_pInternal surface area A of greenhouse body of heat-insulating greenhouse₁Target temperature T in the shed_nAnd the outside environmental temperature T of the thermal insulation shed_wDetermining the target heat transfer coefficient K of the thermal insulation shed₁Wherein

S500: obtaining the heat exchange coefficient a of the inner surface of the greenhouse body of the heat-preservation greenhouse_nHeat-exchange coefficient a of external surface of thermal-insulating shed_wAnd the thermal conductivity coefficient lambda of the material used for the thermal insulation wall body 1, determining the thickness of the thermal insulation wall body 1, wherein

In actual operation, the heating power P of the heater 3 is preset, and the heat radiation amount q per unit time in the greenhouse of the heat-insulating shed is based on the heating power P of the heater 3_dAnd the heat dissipating capacity q of the thermal insulation shed body in unit time_pAnd the thickness of the thermal insulation wall 1 is determined according to the related heat transfer parameters of the selected material of the thermal insulation wall 1, and finally the thermal insulation shed is built according to the determined thickness of the thermal insulation wall 1.

According to the actual operation process, the thickness adjustment method of the thermal insulation wall body of the thermal insulation shed for installing the ultra (ultra) high-voltage transformer in the alpine region provided by the embodiment maintains the temperature in the thermal insulation shed at the target temperature T in the shed by acquiring the temperature in the thermal insulation shed_nIn the meantime, the heating power P of the heater 3 and the heat dissipating capacity q of the ground in the heat-insulating shed per unit time_dTo determine the heat dissipating capacity q of the thermal insulation shed body in unit time_p(ii) a And through obtaining the canopy of the thermal insulation shedHeat radiation quantity q per unit time_pInternal surface area A of greenhouse body of heat-insulating greenhouse₁Target temperature T in the shed_nAnd the outside environmental temperature T of the thermal insulation shed_wDetermining the target heat transfer coefficient K of the thermal insulation shed₁(ii) a Finally, obtaining the target heat transfer coefficient K of the heat preservation shed₁Heat-insulating shed body internal surface heat-exchange coefficient a_nHeat-exchange coefficient a of external surface of thermal-insulating shed_wAnd the thermal conductivity coefficient lambda of the material used by the thermal insulation wall 1, so as to determine the thickness of the thermal insulation wall 1; therefore, the thickness of the heat insulation wall body 1 of the heat insulation shed can be determined according to the heating power of the heater 3, the heat dissipation capacity of the shed body of the heat insulation shed in unit time and the heat dissipation capacity of the ground in the shed of the heat insulation shed in unit time, the waste of materials caused by overlarge thickness of the heat insulation wall body 1 is avoided, or the heat insulation performance of the heat insulation shed is reduced caused by undersize thickness, so that the heat insulation shed can meet the heat insulation requirement, and meanwhile, the construction cost of the heat insulation shed is reduced.

Referring to FIG. 3, the heat dissipation q per unit time of the ground in the thermal insulation shed in the above embodiment is obtained_dThe methods of (a) are various but generally should include:

s111, acquiring target temperature T in the shed_nExternal environment temperature T of heat preservation shed_wGround area A in the greenhouse of the heat preservation greenhouse₂And the ground heat transfer coefficient K in the greenhouse of the heat preservation shed₂；

S112: according to the target temperature T in the shed_nExternal environment temperature T of heat preservation shed_wThe ground area A in the shed₂Heat transfer coefficient K of ground in shed₂Determining the heat dissipation capacity q of the ground in the heat preservation shed in unit time_dWherein q is_d＝K₂A₂(T_n-T_w)。

It should be noted that, in the method for adjusting the thickness of the thermal insulation wall of the thermal insulation shed for installing the extra (ultra) high voltage transformer in the alpine region provided in the above embodiment, the number k of the thermal insulation walls 1 may be set up according to actual needs, taking fig. 1 and fig. 4 as an example, the thermal insulation shed includes a fence and a ceiling 2 arranged on the fence, the fence includes at least two thermal insulation walls 1, and each thermal insulation wall 1 includes i layers of thermal insulation portions 11 (i is 3 in fig. 4) arranged along the height direction of the thermal insulation shed; the thermal insulation shed wall body 1 with the structure satisfies the following relations:

$\frac{\mathrm{\δ}}{\mathrm{\λ}}=\mathrm{\Σ}\frac{{\mathrm{\δ}}_i}{{\mathrm{\λ}}_i};$

wherein, the thickness of the thermal insulation wall 1 comprises the thickness of the thermal insulation part 11 in each thermal insulation wall 1_i(ii) a The thermal conductivity λ of the material used for the thermal insulation wall 1 includes the thermal conductivity λ of the material used for the thermal insulation part 11 in each thermal insulation wall 1_i. Thus, the thickness of the heat-insulating wall 1 with the multi-layer building structure can be adjusted.

And if the three heaters 3 are used to control the temperature of the greenhouse, the positions of the three heaters 3 and the heating temperatures satisfy the following formulas.

$T_3=T_2+(T_1-T_2)\frac{1/R_3-1/R_2}{1/R_1-1/R_2};$

Wherein R is₁Is the distance from the reference position to the first heater; r₂Is the distance from the reference position to the second heater; r₃Is the distance from the reference position to the third heater; t is₁Is the heating temperature of the first heater; t is₂Is the heating temperature of the second heater; t is₃Is the heating temperature of the third heater. Thus, the heating temperature to be reached by the heater 3 can be determined according to the temperature required when the ultra (ultra) high voltage transformer 4 is installed and the distance between the ultra (ultra) high voltage transformer 4 and the heater 3, so that the heating power of the heater 3 can be obtained; moreover, when the thermal insulation wall 1 is at a certain distance from the heater 3, the indoor temperature of the position where the thermal insulation wall is located can be obtained through the calculation method, so that the thickness which the thermal insulation wall 1 actually needs to reach can be obtained more accurately.

In the foregoing description of embodiments, the particular features, structures, materials, or characteristics may be combined in any suitable manner in any one or more embodiments or examples.

The above description is only for the specific embodiments of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can easily conceive of the changes or substitutions within the technical scope of the present invention, and all the changes or substitutions should be covered within the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the appended claims.

Claims (4)

1. The method for adjusting the thickness of the heat preservation wall of the heat preservation shed for installing the ultra (ultra) high voltage transformer in the alpine region is characterized in that the heat preservation shed comprises an enclosing wall and a ceiling arranged on the enclosing wall, the enclosing wall comprises the heat preservation wall, a heater is arranged in the heat preservation shed, and the heating power P of the heater is controlled, so that the heater heats the heat preservation shed to the target temperature T in the heat preservation shed_nAnd maintaining the temperature in the heat preservation shed at the target temperature in the shed; the method for adjusting the thickness of the heat-insulating wall comprises the following steps:

obtaining heating work of heaterRatio P and heat dissipation q of ground in greenhouse of heat-insulating greenhouse_d(ii) a According to the heating power P of the heater and the heat dissipating capacity q of the ground in the heat preservation shed in unit time_dDetermining the heat dissipating capacity q of the thermal insulation shed body in unit time_pWherein q is_p＝P-q_d；

Obtaining the internal surface area A of the greenhouse body of the heat preservation greenhouse₁Target temperature T in the shed_nAnd the outside environmental temperature T of the thermal insulation shed_wAccording to the heat dissipating capacity q of the thermal insulation shed body in unit time_pInternal surface area A of greenhouse body of heat-insulating greenhouse₁Target temperature T in the shed_nAnd the outside environmental temperature T of the thermal insulation shed_wDetermining the target heat transfer coefficient K of the thermal insulation shed₁Wherein

Obtaining the heat exchange coefficient a of the inner surface of the greenhouse body of the heat-preservation greenhouse_nHeat-exchange coefficient a of external surface of thermal-insulating shed_wAnd the thermal conductivity coefficient lambda of the material used for the thermal insulation wall, determining the thickness of the thermal insulation wall, wherein

2. The method for adjusting the thickness of the thermal insulation wall of the thermal insulation shed for installing the ultra (high) voltage transformer in the alpine region according to claim 1, wherein the heat dissipation capacity q per unit time of the ground in the thermal insulation shed is_dThe obtaining method comprises the following steps:

obtaining a target temperature T in the greenhouse_nExternal environment temperature T of heat preservation shed_wGround area A in the greenhouse of the heat preservation greenhouse₂And the ground heat transfer coefficient K in the greenhouse of the heat preservation shed₂According to the target temperature T in the greenhouse_nExternal environment temperature T of heat preservation shed_wThe ground area A in the shed₂Heat transfer coefficient K of ground in shed₂Determining the heat dissipation capacity q of the ground in the heat preservation shed in unit time_dWherein q is_d＝K₂A₂(T_n-T_w)。

3. The method for adjusting the thickness of the thermal insulation wall of the thermal insulation shed for the installation of the ultra (ultra) high voltage transformer in the alpine region according to claim 1, wherein the number k of the thermal insulation walls is at least two, and each thermal insulation wall comprises i layers of thermal insulation parts arranged along the height direction of the thermal insulation shed;

$\frac{\mathrm{\δ}}{\mathrm{\λ}}=\mathrm{\Σ}\frac{{\mathrm{\δ}}_i}{{\mathrm{\λ}}_i};$

the thickness of the heat-insulating wall body comprises the thickness of each heat-insulating part in the heat-insulating wall body_i；

The heat conductivity coefficient lambda of the material used for the heat-insulating wall body comprises the heat conductivity coefficient lambda of the material used for the heat-insulating part in each heat-insulating wall body_i。

4. The method for adjusting the thickness of the thermal insulation wall of the thermal insulation shed for the installation of the ultra (ultra) high voltage transformer in the alpine region according to claim 1, wherein when the thermal insulation shed is subjected to temperature control by using three heaters, the positions and heating temperatures of the three heaters satisfy the following formula:

$T_3=T_2+(T_1-T_2)\frac{1/R_3-1/R_2}{1/R_1-1/R_2};$

wherein,

R₁is the distance from the reference position to the first heater;

R₂is the distance from the reference position to the second heater;

R₃is the distance from the reference position to the third heater;

T₁is the heating temperature of the first heater;

T₂is the heating temperature of the second heater;

T₃is the heating temperature of the third heater.