WO2021109635A1

WO2021109635A1 - Platform and method for testing aerodynamic characteristic of respiratory system of transformer

Info

Publication number: WO2021109635A1
Application number: PCT/CN2020/111686
Authority: WO
Inventors: 李恒真; 张乾良; 黄静; 陈道品; 武利会; 温源; 何子兰; 何旭亮; 李毅东; 杨建伟; 陈邦发; 陈斯翔; 温可明; 梁家盛
Original assignee: 广东电网有限责任公司; 广东电网有限责任公司佛山供电局
Priority date: 2019-12-05
Filing date: 2020-08-27
Publication date: 2021-06-10
Also published as: CN110864927A; CN110864927B

Abstract

Provided are a platform and method for testing the aerodynamic characteristic of a respiratory system of a transformer. In the method, the oil level stabilization time of a respiratory system is acquired by means of a platform, a respiratory time index at the oil level stabilization time is acquired, an aerodynamic characteristic assessment factor of the respiratory system is determined, and finally, the aerodynamic characteristic of the respiratory system of a transformer is assessed. By means of the method for assessing the aerodynamic characteristic of a respiratory system, the superiority or inferiority of the aerodynamic characteristic of a given respiratory system can be quickly determined, thereby improving the safety and economy of the operating of a transformer.

Description

Platform and method for testing pneumatic characteristics of transformer breathing system

Technical field

The invention relates to the field of high-voltage power equipment state evaluation, and more specifically, to a testing platform and method for aerodynamic characteristics of a transformer breathing system.

Background technique

Oil-immersed transformers are one of the most important equipment in AC transmission and transformation systems. With the construction of UHV AC and DC transmission in full swing in my country, the voltage level and capacity of transformers are also moving towards a higher level. While the voltage level and capacity have increased, higher requirements have also been placed on the temperature rise control inside the transformer. In order to keep the temperature everywhere in the transformer not exceeding the temperature rise limit of the insulation system, the insulating oil circulates naturally or forcedly inside the transformer, bringing the heat inside the transformer to the radiator and finally dissipating into the air. Insulating oil has thermal expansion, and the volume change of insulating oil during operation needs to be compensated by the breathing system. The breathing system serves as a channel for balancing the air pressure inside and outside the fuel tank, and its aerodynamic characteristics directly affect the safety of the transformer operation. If the air resistance of the respiratory system is too large, it may cause premature aging of components such as the capsule bag in the oil conservator, and cause heavy gas protection. For a given respiratory system, its aerodynamic characteristics depend on multiple parameters, such as the geometric size and direction of the gas path, the amount of silica gel filling and humidity, environmental humidity and load fluctuations. It is difficult to calculate the aerodynamic characteristics by analytical methods. Therefore, there is an urgent need for a simple and rapid method to evaluate and judge the pneumatic characteristics of the respiratory system, so as to provide guidance on the geometrical dimensions of the respiratory system, the design of the pipeline direction structure, and the filling amount of water-absorbing silica gel.

Summary of the invention

The invention provides a testing platform for the pneumatic characteristics of the respiratory system of a transformer, which can simply and quickly evaluate and judge the pneumatic characteristics of the respiratory system.

Another object of the present invention is to provide a method for testing aerodynamic characteristics of a transformer breathing system.

In order to achieve the above technical effects, the technical solution of the present invention is as follows:

A test platform for pneumatic characteristics of transformer breathing system, including oil tank, insulating oil, heating device, analog load power supply, electronic oil level gauge, oil storage tank, constant humidity box, respirator, first humidity controller, and second humidity controller , Pipeline hygrometer, box hygrometer, terminal, oil pipe and air pipe; oil storage tank and oil tank are connected by oil pipe, respirator and oil storage tank are connected by air pipe to realize the pressure balance of insulating oil under heating by the heating device; heating The device is connected to the analog load power supply, and the insulating oil is heated with different load factors under the control of the terminal; the electronic oil level gauge is installed on the side of the oil conservator and connected to the terminal to realize real-time monitoring of the oil level of the oil conservator; A humidity controller and a second humidity controller are installed at the bottom of the constant humidity box, and the hygrometer in the cabinet is installed on the side wall of the constant humidity box and connected to the terminal. The three are used to realize the humidity adjustment and stability in the constant humidity box; The pipe hygrometer is installed inside the trachea and connected to the terminal to monitor the humidity of the breathing airflow of the respirator.

A test method for aerodynamic characteristics of a transformer breathing system, including the following steps:

S1: Obtain the stabilization time of the oil level of the respiratory system;

S2: Respiration time index when obtaining oil level stabilization time;

S3: Determine the evaluation factor R _{est of the} aerodynamic characteristics of the respiratory system;

S4: Evaluate the aerodynamic characteristics of the transformer breathing system.

Further, the specific process of the step S1 is:

1) Set the relative humidity of the constant humidity box (7) to H ₁ (%), turn on the analog load power supply (4), and obtain the time when the oil level reaches stable when the load factor is 0.5, 1.0, and _{1.5, which are respectively recorded as t 0.5} , T _1.0 , t _1.5 ;

2) Increase the relative humidity of the constant humidity box (7) to H ₂ (%), turn on the analog load power supply (4), and obtain the time when the oil level reaches stable when the load factor is 0.5, 1.0, and 1.5, which are respectively marked as t ′ _0.5 , t′ _1.0 , t′ _1.5 ;

3). Continue to increase the relative humidity of the constant humidity box (7) to H ₃ (%), turn on the analog load power supply (4), and obtain the time when the oil level reaches a stable load factor of 0.5, 1.0, and 1.5, which are respectively marked as t " _0.5 , t" _1.0 , t" _1.5 .

Further, the _{value range of the H 1} is: 10<H ₁ ≤30; the _{value range of the H 2} is: 40<H ₂ ≤60; the _{value range of the H 3} is: 70<H ₃ ≤90.

Further, the specific process of step S2 is:

1) _{Substitute t 0.5} , t _1.0 , t _1.5 into formula (1) to calculate the respiratory time index τ _{bre,H1 of the} _{respiratory system when the relative humidity is H 1} :

2) _{Substitute t′ 0.5} , t′ _1.0 , t′ _1.5 into formula (2) to calculate the respiratory time index τ _{bre,H2 of the} _{respiratory system when the relative humidity is H 2} :

3) _{Substitute t″ 0.5} , t″ _1.0 , t″ _1.5 into formula (3), and calculate the respiratory time index τ _{bre,H3 of the} _{respiratory system when the relative humidity is H 3} :

Further, the specific process of step S3 is:

Substitute τ _bre,H1 , τ _bre,H2 , τ _bre,H3 into formula (4) to calculate the aerodynamic characteristic evaluation factor R _{est of} the respiratory system:

In the formula, β is the volume expansion rate of the insulating oil, and R _H is the equivalent water absorption of the respirator, where R _H is 8400 mL.

Further, the specific process of step S4 is:

Evaluate the aerodynamic characteristics of the breathing system of the transformer. If 0<R _est ≤1, it means that the aerodynamic characteristics of the breathing system is good, and if _Rest >1, it means that the aerodynamic characteristics of the breathing system need to be improved.

Compared with the prior art, the technical solution of the present invention has the following beneficial effects:

The invention builds a testing platform for the aerodynamic characteristics of the respiratory system of the transformer; obtains the stable time of the respiratory system oil level through the platform, obtains the respiratory time index during the stable time of the oil level, determines the aerodynamic characteristics evaluation factor of the respiratory system, and finally evaluates the aerodynamic characteristics of the respiratory system of the transformer. The present invention utilizes the method for evaluating aerodynamic characteristics of the respiratory system, which can quickly determine the pros and cons of a given respiratory system aerodynamic characteristics, and improve the safety and economy of transformer operation.

Description of the drawings

Figure 1 is a system structure diagram of the present invention;

Figure 2 is a flow chart of the method of the present invention.

Detailed ways

The attached drawings are only for illustrative purposes, and should not be understood as a limitation of this patent;

In order to better illustrate this embodiment, some parts of the drawings may be omitted, enlarged or reduced, and do not represent the size of the actual product;

For those skilled in the art, it is understandable that some well-known structures in the drawings and their descriptions may be omitted.

The technical solution of the present invention will be further described below in conjunction with the drawings and embodiments.

Example 1

As shown in Figure 1, a testing platform for aerodynamic characteristics of a transformer breathing system includes an oil tank 1, insulating oil 2, heating device 3, analog load power supply 4, electronic oil level gauge 5, oil conservator 6, constant humidity tank 7, breathing Device 8, the first humidity controller 9, the second humidity controller 10, the pipeline hygrometer 11, the in-chamber hygrometer 12, the terminal 13, the oil pipe 14 and the air pipe 15; the oil conservator 6 and the oil tank 1 are connected by the oil pipe 14, The respirator 8 and the oil conservator 6 are connected through the air pipe 15 to realize the air pressure balance of the insulating oil 2 under the heating of the heating device 3; the heating device 3 is connected to the analog load power source 4, and the insulating oil 2 is controlled under the control of the terminal 13 Heating with different load factors; the electronic oil level gauge 5 is installed on the side of the oil conservator 6 and connected to the terminal 13 to realize real-time monitoring of the oil level of the oil conservator; the first humidity controller 9 and the second humidity controller 10 are installed on At the bottom of the constant humidity box, the hygrometer 12 in the box is installed on the side wall of the constant humidity box 7 and connected to the terminal. The three are used to realize the humidity adjustment and stability in the constant humidity box 7; the pipe hygrometer 11 is installed inside the air pipe 15 , Connected with the terminal 13 to realize the humidity monitoring of the breathing airflow of the respirator 8.

Example 2

As shown in Figure 2, a test method for aerodynamic characteristics of a transformer breathing system includes the following steps:

S1: Obtain the stabilization time of the oil level of the respiratory system;

S2: Respiration time index when obtaining oil level stabilization time;

S3: Determine the aerodynamic characteristic evaluation factor R _{est of the} respiratory system;

The specific process of step S1 is:

1) Set the relative humidity of the constant humidity box (7) to H ₁ (%), 10＜H ₁ ≤30, turn on the analog load power supply (4), and obtain a stable oil level when the load factor is 0.5, 1.0, 1.5 Time, denoted as t _0.5 , t _1.0 , t _{1.5 respectively} ;

2). Increase the relative humidity of the constant humidity box (7) to H ₂ (%), 40＜H ₂ ≤60, turn on the analog load power supply (4), and obtain a stable oil level when the load factor is 0.5, 1.0, and 1.5 The time of is recorded as t′ _0.5 , t′ _1.0 , t′ _{1.5, respectively} ;

3). Continue to increase the relative humidity of the constant humidity box (7) to H ₃ (%), 70＜H ₃ ≤90, turn on the analog load power supply (4), and obtain a stable oil level when the load factor is 0.5, 1.0, and 1.5 The time is respectively recorded as t″ _0.5 , t″ _1.0 , and t″ _1.5 .

The specific process of step S2 is:

The specific process of step S3 is:

In the formula, β is the volume expansion rate of insulating oil, R _H is the equivalent water absorption of the respirator, and R _H is 8400mL.

The specific process of step S4 is:

The same or similar reference numbers correspond to the same or similar parts;

The description of the positional relationship in the drawings is only for illustrative purposes, and cannot be understood as a limitation of the patent;

Obviously, the above-mentioned embodiments of the present invention are merely examples to clearly illustrate the present invention, and are not intended to limit the embodiments of the present invention. For those of ordinary skill in the art, other changes or modifications in different forms can be made on the basis of the above description. It is unnecessary and impossible to list all the implementation methods here. Any modification, equivalent replacement and improvement made within the spirit and principle of the present invention shall be included in the protection scope of the claims of the present invention.

Claims

A testing platform for aerodynamic characteristics of a transformer breathing system, which is characterized by comprising an oil tank (1), insulating oil (2), a heating device (3), a simulated load power supply (4), an electronic oil level gauge (5), and an oil conservator (6), constant humidity box (7), respirator (8), first humidity controller (9), second humidity controller (10), pipe hygrometer (11), in-box hygrometer (12), The terminal (13), the oil pipe (14) and the air pipe (15); the oil conservator (6) and the oil tank (1) are connected through the oil pipe (14), and the breather (8) and the oil conservator (6) are connected through the air pipe (15) ) Is connected to realize the air pressure balance of the insulating oil (2) under the heating of the heating device (3); the heating device (3) is connected to the analog load power supply (4), and the insulating oil (2) is controlled by the terminal (13). ) For heating with different load factors; the electronic oil level gauge (5) is installed on the side of the oil conservator (6) and connected to the terminal (13) to realize real-time monitoring of the oil level of the oil conservator; the first humidity controller (9) ) And the second humidity controller (10) are installed at the bottom of the constant humidity box, and the hygrometer (12) in the box is installed on the side wall of the constant humidity box (7) and connected to the terminal. The three are used to realize the constant humidity box ( 7) Humidity regulation and stabilization in the interior; the pipeline hygrometer (11) is installed inside the trachea (15) and connected with the terminal (13) to realize the humidity monitoring of the breathing airflow of the respirator (8).
A testing method for aerodynamic characteristics of a transformer breathing system is characterized in that it comprises the following steps:

S1: Obtain the stabilization time of the oil level of the respiratory system;

S2: Respiration time index when obtaining oil level stabilization time;

S3: Determine the aerodynamic characteristic evaluation factor R est of the respiratory system;

S4: Evaluate the aerodynamic characteristics of the transformer breathing system.
The method for testing aerodynamic characteristics of a transformer breathing system according to claim 2, wherein the specific process of step S1 is:

1) Set the relative humidity of the constant humidity box (7) to H 1 (%), turn on the analog load power supply (4), and obtain the time when the oil level reaches stable when the load factor is 0.5, 1.0, and 1.5, which are respectively recorded as t 0.5 , T 1.0 , t 1.5 ;

2) Increase the relative humidity of the constant humidity box (7) to H 2 (%), turn on the analog load power supply (4), and obtain the time when the oil level reaches stable when the load factor is 0.5, 1.0, and 1.5, which are respectively marked as t ′ 0.5 , t′ 1.0 , t′ 1.5 ;

3). Continue to increase the relative humidity of the constant humidity box (7) to H 3 (%), turn on the analog load power supply (4), and obtain the time when the oil level reaches a stable load factor of 0.5, 1.0, and 1.5, which are respectively marked as t " 0.5 , t" 1.0 , t" 1.5 .
The method for testing aerodynamic characteristics of a breathing system of a transformer according to claim 3, wherein the value range of the H 1 is: 10<H 1 ≤30.
The method for testing aerodynamic characteristics of a transformer breathing system according to claim 4, wherein the value range of the H 2 is: 40<H 2 ≤60.
The method for testing aerodynamic characteristics of a breathing system of a transformer according to claim 5, wherein the value range of the H 3 is: 70<H 3 ≤90.
The method for testing aerodynamic characteristics of a transformer breathing system according to claim 6, wherein the specific process of step S2 is:

1) Substitute t 0.5 , t 1.0 , t 1.5 into formula (1) to calculate the respiratory time index τ bre,H1 of the respiratory system when the relative humidity is H 1 :

2) Substitute t′ 0.5 , t′ 1.0 , t′ 1.5 into formula (2) to calculate the respiratory time index τ bre,H2 of the respiratory system when the relative humidity is H 2 :

3) Substitute t″ 0.5 , t″ 1.0 , t″ 1.5 into formula (3), and calculate the respiratory time index τ bre,H3 of the respiratory system when the relative humidity is H 3 :
The method for testing aerodynamic characteristics of a breathing system of a transformer according to claim 7, wherein the specific process of step S3 is:

Substitute τ bre,H1 , τ bre,H2 , τ bre,H3 into formula (4) to calculate the aerodynamic characteristic evaluation factor R est of the respiratory system:

In the formula, β is the volume expansion rate of insulating oil, and R H is the equivalent water absorption of the respirator.
The method for testing aerodynamic characteristics of a transformer breathing system according to claim 8, wherein the specific process of step S4 is:

Evaluate the aerodynamic characteristics of the breathing system of the transformer. If 0<R est ≤1, it means that the aerodynamic characteristics of the breathing system is good, and if Rest >1, it means that the aerodynamic characteristics of the breathing system need to be improved.
The method for testing aerodynamic characteristics of a transformer breathing system according to claim 9, wherein the R H is 8400 mL.