Oil distribution device and method for calibration oil of on-line transformer oil chromatograph

Abstract

The invention provides an oil distribution device and method for on-line transformer oil chromatograph calibration oil, the oil distribution device comprises an oil distribution cylinder, an oil storage cylinder, a circulating pump, a temperature adjusting device and a box body, the oil distribution cylinder, the circulating pump, the oil storage cylinder and the temperature adjusting device are sequentially connected in series through a pipeline to form an oil distribution loop, and the oil distribution loop is arranged in the box body; transformer oil circularly flows in the oil distribution loop, the circulating pump is used for providing power for circular flowing of the transformer oil, and the temperature adjusting device is used for adjusting the temperature of the transformer oil; the oil distribution cylinder is provided with an oil injection port and an air inlet pipeline, and an outlet of the air inlet pipeline extends to the bottom of the oil distribution cylinder. According to the oil distribution device and method, oil liquid circulation is carried out through the oil distribution loop, meanwhile, the temperature of the oil liquid is controlled through the temperature adjusting device, and characteristic gas can be dispersed, absorbed and intensively mixed in transformer oil.

Description

Technical Field

[0001] The invention relates to the technical field of online transformer oil chromatograph calibration, and in particular to an oil dispensing device and method for online transformer oil chromatograph calibration oil. Background Art

[0002] Many of the main transformers of domestic power generation units have been installed with online monitoring devices for dissolved gases in transformer oil, which plays an important role in tracking and analyzing the status of oil-filled equipment such as main transformers. In order to ensure the accuracy of the data measured by the monitoring device, it needs to be calibrated regularly to effectively discover and confirm the health status of the equipment. However, the calibration of the monitoring device generally lacks high-precision standard oil preparation devices.

[0003] The accuracy and repeatability of the data measured by online monitoring devices often vary to a certain extent, which hinders the timely detection of deviations. On-site equipment calibration in remote areas is a common and difficult problem in the industry.

[0004] In addition, the existing testing procedures are complicated and can only be achieved by pouring the standard oil into the tank, which is time-consuming and laborious. Data distortion is prone to occur during the backfilling or transportation process; the detection volume of each tank is limited; the characteristic gas of the standard oil in the tank is fixed, and a tank sample cannot achieve high, medium, and low data comparison; the tank pouring operation increases transportation and labor costs. At present, no portable calibration equipment has been seen on the market. Because the oil distribution system is huge and its own volume is relatively large. The prepared samples cannot be directly connected to the online chromatograph on site or are difficult to achieve.

[0005] In this regard, corresponding improvement measures need to be taken, such as pouring the prepared standard oil into the oil tank and carrying the oil tank to the site for online chromatographic calibration.

[0006] As for the calibration of online monitoring devices in remote areas or areas with inconvenient transportation, the current situation is that it must be operated through standard oil pouring tanks, which will inevitably cause data interference and is difficult to operate.

[0007] In view of this, the inventor of the present application has designed an oil dispensing device and method for calibrating oil for an online transformer oil chromatograph in order to overcome the above technical problems. Summary of the invention

[0008] The technical problem to be solved by the present invention is to overcome the defects that the accuracy and repeatability of the data measured by the online monitoring device in the prior art often have a certain degree of difference, which hinders the timely discovery of deviations; the on-site equipment calibration in remote areas is a common difficult problem in the industry; the existing detection procedures are complicated and can only be achieved by pouring standard oil into a tank, and an oil distribution device and method for calibrating the oil for an online transformer oil chromatograph are provided.

[0009] The present invention solves the above technical problems through the following technical solutions:

[0010] The invention provides an oil distribution device for calibrating oil for an online transformer oil chromatograph, and the oil distribution device comprises an oil distribution cylinder, an oil storage cylinder, a circulation pump, a temperature regulating device and a box body, wherein the oil distribution cylinder, the circulation pump, the oil storage cylinder and the temperature regulating device are sequentially connected in series through pipelines to form an oil distribution circuit, and the oil distribution circuit is arranged in the box body; transformer oil circulates in the oil distribution circuit, the circulation pump is used for providing power for the transformer oil to circulate, and the temperature regulating device is used for regulating the temperature of the transformer oil; an oil filling port and an air inlet pipeline are arranged on the oil distribution cylinder, and the outlet of the air inlet pipeline extends to the bottom of the oil distribution cylinder.

[0011] According to one embodiment of the present invention, an oil inlet is provided at the upper portion of the oil distribution cylinder, the oil inlet is communicated with the oil distribution circuit, and a spray device is provided at the oil inlet.

[0012] According to one embodiment of the present invention, the oil distribution device further comprises a degassing pipeline, one end of which is connected to the oil distribution cylinder, the other end of which is connected to the outside of the casing, and a degassing device is arranged on the degassing pipeline.

[0013] According to one embodiment of the present invention, a pressure sensor is provided on the oil distribution cylinder and / or the oil storage cylinder.

[0014] According to one embodiment of the present invention, a constant temperature balancing component is provided on the oil storage cylinder to maintain the temperature of the transformer oil within a set range.

[0015] According to an embodiment of the present invention, a temperature sensor is also provided on the oil storage cylinder.

[0016] According to one embodiment of the present invention, the inlet of the air intake pipeline is connected to a gas source of characteristic gas.

[0017] According to one embodiment of the present invention, the characteristic gas includes H 2 ,CO,CO 2 , CH 4 , C 2 H 4 , C 2 H 6 and C 2 H 2 .

[0018] According to one embodiment of the present invention, the gas source of the characteristic gas includes a gas source of a first concentration characteristic gas, a gas source of a second concentration characteristic gas, and a gas source of a third concentration characteristic gas, wherein the content of the first concentration characteristic gas is H 2:5uL / L、CO:15uL / L、CO 2 :200uL / L、CH 4 :0.5uL / L、C 2 H 4 :0.5uL / L、C 2 H 6 :0.5uL / L and C 2 H 2 :0.5uL / L;The content of the second concentration characteristic gas is H 2 :150uL / L, CO: 200uL / L, CO 2 :800uL / L、CH 4 :5uL / L、C 2 H 4 :5uL / L、C 2 H 6 :5uL / L and C 2 H 2 : 5uL / L; the content of the third concentration characteristic gas is H 2 : 1000uL / L, CO: 1000uL / L, CO 2 :4000uL / L、CH 4 :50uL / L、C 2 H 4 :50uL / L、C 2 H 6 :50uL / L and C 2 H 2 :50uL / L.

[0019] The present invention also provides an oil preparation method for online transformer oil chromatograph calibration oil, which is characterized in that the oil preparation method uses the above-mentioned online transformer oil chromatograph calibration oil preparation device, and the oil preparation method comprises the steps of: S 1 1. Open the oil filling port and start the degassing device to generate negative pressure, so that the original oil sample of the transformer oil flows into the oil distribution cylinder; S 2 1. Close the oil filling port and continue to start the degassing device to discharge the impurities in the original oil sample. When the negative pressure reaches negative one atmosphere, close the degassing device; S 3 1. Open the gas injection port of the air inlet pipeline and inject characteristic gas into the transformer oil. When the pressure reaches 0.2-0.3 atmospheres, close the gas injection port; S 4 1. Turn on the temperature control device and the circulation pump, and the transformer oil circulates in the oil distribution circuit; when the air pressure drops, open the air injection port of the air inlet pipe and inject the characteristic gas; after circulating for 20 to 30 minutes, the gas in the transformer oil is fully saturated and evenly distributed, and the configuration of the transformer oil chromatograph calibration oil is completed.

[0020] The positive and progressive effects of the present invention are:

[0021] The oil dispensing device and method for online transformer oil chromatograph calibration oil of the present invention have at least the following advantages:

[0022] The present invention circulates oil through the oil distribution circuit, and the temperature regulating device controls the temperature of the oil, which can achieve the dispersed absorption and centralized mixing of characteristic gases in the transformer oil. The setting of the spray device realizes the leaching gas replenishment mode, which makes the gas dissolve more fully and quickly, and is conducive to the rapid oil distribution on site. The setting of the degassing pipeline and the degassing device enables the oil distribution device to have the function of blank oil production. By equipping the characteristic gas source with three different gas concentrations of high, medium and low, it can prepare standard oil samples of different concentrations according to the user's on-site needs. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] The above and other features, properties and advantages of the present invention will become more apparent through the following description in conjunction with the accompanying drawings and embodiments, in which the same reference numerals always represent the same features, wherein:

[0024] Figure 1 The invention is a schematic structural diagram of an oil dispensing device for calibrating oil for an online transformer oil chromatograph.

[0025] [Reference Signs]

[0026] Oil cylinder 100

[0027] Oil filling port 110

[0028] Intake pipe 120

[0029] Oil inlet 130

[0030] Spraying device 140

[0031] Degassing line 150

[0032] Degassing device 160

[0033] Oil filling line 170

[0034] Oil storage tank 200

[0035] Oil port 210

[0036] Circulation pump 300

[0037] Temperature control device 400

[0038] Box 500

[0039] Pulley 510 DETAILED DESCRIPTION

[0040] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the specific embodiments of the present invention are described in detail below with reference to the accompanying drawings.

[0041] Embodiments of the present invention will now be described in detail with reference to the accompanying drawings. Reference will now be made in detail to preferred embodiments of the present invention, examples of which are shown in the accompanying drawings. Wherever possible, the same reference numerals will be used in all drawings to represent the same or similar parts. In addition, although the terms used in the present invention are selected from well-known and commonly used terms, some of the terms mentioned in the specification of the present invention may be selected by the applicant at his or her discretion, and their detailed meanings are explained in the relevant parts of the description herein. In addition, it is required to understand the present invention not only by the actual terms used, but also by the meaning implied by each term.

[0042] The inventors of this application have developed a standard oil preparation device for calibrating online monitoring devices for dissolved gases in oil in the power industry in accordance with the requirements of standard DL / T 1463-2015 "Preparation of working standard oil for analysis of dissolved gas component content in transformer oil". The device has the characteristics of high accuracy, rapidity and portability, and achieves portable volume, dynamic standard data and verifiable preparation effect.

[0043] like Figure 1 As shown, the present invention provides an oil dispensing device for calibrating oil for an online transformer oil chromatograph, the oil dispensing device comprising an oil dispensing cylinder 100, an oil storage cylinder 200, a circulating pump 300, a temperature regulating device 400 and a box 500.

[0044] The oil distribution cylinder 100 , the circulation pump 300 , the oil storage cylinder 200 , and the temperature regulating device 400 are sequentially connected in series through pipelines to form an oil distribution circuit, and the oil distribution circuit is arranged in the box 500 .

[0045] The transformer oil circulates in the oil distribution circuit, the circulation pump 300 is used to provide power for the transformer oil to circulate, and the temperature regulating device 400 is used to regulate the temperature of the transformer oil.

[0046] The oil distribution cylinder 100 is provided with an oil filling port 110 and an air intake pipeline 120 , and the outlet of the air intake pipeline 120 extends to the bottom of the oil distribution cylinder 100 .

[0047] Preferably, a support frame is welded to the bottom of the oil distribution cylinder 100, and the support frame has a shock-absorbing design. The support frame is installed at the bottom of the box body 500, and the support frame and the bottom of the box body 500 can be fixed with screws. Welding frames are arranged around the oil storage cylinder 200, and the welding frames can be fixed to the side casing with screws. The circulation pump 300 is installed between the two cylinder bodies of the oil distribution cylinder 100 and the oil storage cylinder 200 through the mounting holes provided by the pump body. The circulation pump 300 is fixed to the remaining space at the bottom of the box body 500, and the circulation pump 300 plays the role of oil circulation. The oil filling port 110 can be connected to the outside of the box body 500 through the oil filling pipeline 170, and the oil filling port 110 is provided with a cover or a valve or other components for closing and opening the oil filling port 110.

[0048] Preferably, the temperature regulating device 400 is installed on the circulation pipeline from the oil storage cylinder 200 to the oil distribution cylinder 100, and plays a role in regulating the oil temperature. According to Henry's law, the temperature of a liquid can increase or decrease its solubility for gas. By adjusting the temperature, the saturated gas content level of the liquid can be adjusted. The temperature regulating device 400 is connected to the box 500 through a supporting component, and the temperature regulating device 400 can control the temperature increase or decrease of the transformer oil. Preferably, a temperature sensor is also provided on the temperature regulating device 400, and the temperature sensor senses the oil temperature of the transformer oil and transmits the temperature signal to the main controller of the oil distribution device of the present invention. The main controller issues an instruction to control the temperature regulating device 400 to increase or decrease the temperature.

[0049] Preferably, the pipelines of the oil distribution circuit are straightened out with pipeline fixing parts and fixed in the space between the oil distribution cylinder 100 and the oil storage cylinder 200 in the box body 500.

[0050] Preferably, the oil injection pipeline 170 can generate negative pressure through a negative pressure system provided on the oil distribution cylinder 100, so that the raw oil enters the oil distribution cylinder 100. When the negative pressure system is in operation, the oil distribution space formed by the connection between the oil distribution cylinder 100 and the oil injection pipeline 170 is in a negative pressure state. Under this negative pressure state, the raw oil to be configured is connected to the oil injection port 110, and under the action of atmospheric pressure, the raw oil will automatically flow into the oil distribution cylinder 100.

[0051] Preferably, the air inlet line 120 can input the standard characteristic gas into the blank oil through positive pressure. The standard characteristic gas is usually filled in a standard gas bottle under positive pressure, and its weight can reach up to 10 kg. Under the action of a one-way valve or a solenoid valve, when the air pressure in the standard gas bottle is greater than the air pressure in the oil distribution cylinder 100, the gas will automatically flow into the blank oil until the air pressure is balanced.

[0052] Further preferably, an intake valve is provided on the intake pipeline 120, and a pressure sensor is provided in the oil distribution cylinder 100. During the gas transmission process of the oil distribution device of the present invention, a pressure signal can be input to the pressure sensor. When the pressure reaches the specified pressure, the equipment will automatically close the intake valve.

[0053] Further preferably, solenoid valves are provided on both the oil filling pipeline 170 and the air intake pipeline 120, and the solenoid valves are controlled by the main controller to control whether the oil filling pipeline 170 and the air intake pipeline 120 are connected. The oil filling port 110 and the air intake port can be set as quick-plug connectors, which are convenient for disassembly and installation of the oil filling pipeline 170 and the air intake pipeline 120 at any time.

[0054] The oil dispensing device for calibrating oil for an online transformer oil chromatograph of the present invention can, when in use, input a well-proportioned standard gas into blank oil through an air inlet pipeline 120 until the gas content in the oil is saturated and the mixing ratio is completed.

[0055] When in use, the circulating pump 300 must be completely sealed and must not contaminate the oil. When circulating the oil, the running speed of the circulating pump 300 is constant. The speed can be changed under the command of the main controller. The uniform fusion of the blank oil and the characteristic gas is achieved through the circulation of the oil flow. The supporting component of the circulating pump 300 is preferably designed as a metal bracket, and anti-vibration measures are added. This supporting component is fixed to the keel of the box 500 with fixing screws and pipeline clamps. The supporting component can prevent the circulating pump 300 from leaking slightly during the transportation or operation of the oil distribution device, thereby causing the leakage of characteristic gas or the mixing of miscellaneous gas.

[0056] The oil distribution device for calibrating oil for an online transformer oil chromatograph of the present invention circulates oil through an oil distribution circuit, and the temperature control device 400 controls the temperature of the oil, thereby enabling dispersed absorption and centralized mixing of characteristic gases in the transformer oil.

[0057] like Figure 1 As shown, as a preferred embodiment of the oil distribution device for calibrating the oil for the online transformer oil chromatograph of the present invention, an oil inlet 130 is provided on the upper part of the oil distribution cylinder 100, the oil inlet 130 is connected to the oil distribution circuit, and a spray device 140 is provided at the oil inlet 130.

[0058] The transformer oil passes through the spray device 140 at the oil inlet 130 to refine the oil. The saturated standard characteristic gas is injected into the oil distribution cylinder 100 through the air inlet pipeline 120, and the space in the oil distribution cylinder 100 is filled with the saturated standard characteristic gas. Under the action of gravity, the transformer oil and the saturated standard characteristic gas are fully fused and absorbed and then gathered in the bottom oil, which plays the role of fully absorbing the characteristic gas and mixing it evenly. The setting of the spray device 140 makes the gas dissolve more fully and quickly, which is conducive to rapid on-site oil distribution.

[0059] like Figure 1As shown, as a preferred embodiment of the oil distribution device for the calibration oil of the online transformer oil chromatograph of the present invention, the oil distribution device also includes a degassing pipeline 150, one end of the degassing pipeline 150 is connected to the oil distribution cylinder 100, and the other end of the degassing pipeline 150 is connected to the outside of the box 500, and a degassing device 160 is arranged on the degassing pipeline 150.

[0060] The degassing pipeline 150 and the degassing device 160 are necessary components for preparing blank oil. Preferably, the interface of the degassing pipeline 150 is placed on the upper part of the oil distribution device of the present invention, and its on and off can be controlled by a solenoid valve or a manual valve. The degassing device 160 is preferably a split design, which is externally placed on the oil distribution device of the present invention, so as to facilitate carrying and reduce the weight of the oil distribution device of the present invention.

[0061] When in use, the flow of transformer oil in the oil distribution circuit is stopped, the operation of irrelevant components such as the circulation pump 300 is stopped, the oil distribution circuit forms a closed space, the degassing device 160 is turned on, the impurities in the transformer oil will be extracted, and the remaining transformer oil is blank oil.

[0062] By additionally arranging the degassing pipeline 150 and the degassing device 160 on the oil dispensing device of the present invention, the function of preparing blank oil is realized, and there is no need to equip the device for preparing blank oil, thereby increasing the function of the oil dispensing device without increasing too much cost. The arrangement of the degassing device 160 and the degassing pipeline 150 can also realize the flexibility of oil dispensing, so as to achieve the purpose of using local materials, configuring on-site, preparing at any time, and using at any time.

[0063] Preferably, the degassing device 160 can be a vacuum pump, which is of an external extension design, easy to carry and transport, so as to reduce the weight of the oil distribution device of the present invention, which is in line with the design concept of compactness and lightness.

[0064] Preferably, the degassing pipeline 150, the oil filling pipeline 170 and the air intake pipeline 120 are arranged side by side on the upper part of the oil distribution cylinder 100, and the three interface names are marked at the interfaces between the three pipelines and the oil distribution cylinder 100 for easy operation.

[0065] As a preferred embodiment of the oil dispensing device for calibrating oil for an online transformer oil chromatograph of the present invention, a pressure sensor is provided on the oil dispensing cylinder 100 and / or the oil storage cylinder 200.

[0066] The pressure sensor arranged on the oil distribution cylinder 100 can detect the pressure in the oil distribution cylinder 100. When the standard characteristic gas is input into the oil distribution cylinder 100, when the pressure in the oil distribution cylinder 100 reaches the specified pressure, the device automatically closes the gas supply valve.

[0067] The pressure sensor disposed on the oil storage cylinder 200 can detect the pressure in the oil storage cylinder 200 to monitor the state of the oil in the oil storage cylinder 200 .

[0068] When the oil in the oil distribution circuit starts to circulate, when the pressure sensor on the oil distribution cylinder 100 and the pressure sensor on the oil storage cylinder 200 simultaneously show a pressure drop, that is, the air pressure in the oil distribution circuit drops, the air injection port of the air intake pipe 120 is opened at this time to inject the characteristic gas.

[0069] As a preferred embodiment of the oil dispensing device for calibrating oil for an online transformer oil chromatograph of the present invention, a constant temperature balancing component is provided on the oil storage cylinder 200 to maintain the temperature of the transformer oil within a set range.

[0070] As a preferred embodiment of the oil dispensing device for calibrating oil for an online transformer oil chromatograph of the present invention, a temperature sensor is also provided on the oil storage cylinder 200 .

[0071] Preferably, the thermostatic balance component has both heating and cooling functions, and surrounds the oil storage cylinder 200 and the pipeline near the oil storage cylinder 200. When receiving a heating or cooling signal, it acts respectively to heat or cool the transformer oil to achieve the required environment for oil distribution.

[0072] Preferably, the constant temperature balancing component can simulate the oil temperature of the transformer during operation, and when the set temperature is reached, its temperature raising and lowering functions can be turned off.

[0073] The constant temperature balance component is preferably an intelligent control. The temperature control system of the constant temperature balance component is designed to be a temperature rise and fall type; when it is necessary to increase the saturated dissolved gas performance, low temperature control is performed; when it is necessary to simulate the operating temperature of the transformer, temperature rise control is performed.

[0074] The temperature sensor on the oil storage cylinder 200 can sense and transmit a temperature signal. The constant temperature balance component heats or cools the transformer oil in the oil storage cylinder 200 according to the temperature signal of the temperature sensor to maintain the temperature of the transformer oil within a set range.

[0075] Preferably, the oil dispensing device for calibrating oil for online transformer oil chromatograph of the present invention further comprises a main controller, which is used to receive signals from sensors such as temperature sensors and pressure sensors, and control the operation status of components such as circulating pump 300, temperature regulating device 400, constant temperature balancing component, solenoid valve, etc. Among them, the constant temperature balancing component can cooperate with the temperature sensor arranged on the oil storage cylinder 200, and can control the opening and closing of the temperature relay in the constant temperature balancing component under the control of the main controller.

[0076] The oil dispensing device for calibrating oil for an online transformer oil chromatograph of the present invention is designed with a temperature protection system, which can prevent the temperature from being too high or too low, or even from being out of control, so as to avoid damage to the transformer oil or equipment.

[0077] As a preferred embodiment of the oil dispensing device for calibrating oil for an online transformer oil chromatograph of the present invention, the inlet of the air inlet pipeline 120 is connected to a gas source of characteristic gas.

[0078] Preferably, the gas source of the characteristic gas is a gas source tank containing the characteristic gas. Preferably, there are three gas source tanks, which respectively contain three characteristic gases of high, medium and low concentrations. A fixing device is provided on the gas source tank, which can be simultaneously hung on the oil distribution device of the present invention.

[0079] Preferably, valves and three-way switches are provided between the three gas source tanks. After the blank oil is produced, high, medium and low concentration standard oil samples can be configured at any time by switching the three characteristic gases of different concentrations. The three gas source tanks are preferably small pressure vessels.

[0080] As a preferred embodiment of the oil dispensing device for calibrating oil for online transformer oil chromatograph of the present invention, the characteristic gas includes H 2 ,CO,CO 2 , CH 4 , C 2 H 4 , C 2 H 6 and C 2 H 2 .

[0081] The three gas source tanks contain different concentrations of online chromatographic characteristic gases (H 2 ,CO,CO 2 , CH 4 , C 2 H 4 , C 2 H 6 , C 2 H 2 ), different concentrations of gas can be used according to configuration requirements.

[0082] Preferably, the gas source tank can be fixed to the oil distribution device of the present invention by a fixing frame. The fixing frame is preferably made of stainless steel, and the fixing frame is suspended and arranged at the rear of the oil distribution device. The fixing frame is firmly designed, beautifully installed, and occupies a small volume.

[0083] Since the oil dispensing device of the present invention has the function of preparing blank oil by itself, different concentrations of characteristic gases can be introduced into the blank oil to prepare standard oils of different concentrations at any time.

[0084] As a preferred embodiment of the oil dispensing device for calibrating oil for an online transformer oil chromatograph of the present invention, the source of the characteristic gas includes a source of a characteristic gas of a first concentration, a source of a characteristic gas of a second concentration, and a source of a characteristic gas of a third concentration.

[0085] The content of the first concentration characteristic gas is H 2 :5uL / L、CO:15uL / L、CO 2 :200uL / L、CH 4 :0.5uL / L、C 2 H 4 :0.5uL / L、C 2 H 6 :0.5uL / L and C 2 H 2 :0.5uL / L.

[0086] The content of the second concentration characteristic gas is H 2 :150uL / L, CO: 200uL / L, CO 2 :800uL / L、CH 4 :5uL / L、C 2 H 4 :5uL / L、C 2 H 6 :5uL / L and C 2 H 2 :5uL / L.

[0087] The content of the third concentration characteristic gas is H 2 : 1000uL / L, CO: 1000uL / L, CO 2 :4000uL / L、CH 4 :50uL / L、C 2 H 4 :50uL / L、C 2 H 6 :50uL / L and C 2 H 2 :50uL / L.

[0088] The first concentration characteristic gas is a low concentration characteristic gas, the second concentration characteristic gas is a medium concentration characteristic gas, and the third concentration characteristic gas is a high concentration characteristic gas.

[0089] Preferably, an oil extraction port 210 is provided on the oil distribution device of the present invention. The oil extraction port 210 is preferably provided on the oil storage cylinder 200 and connected to the outside of the box body 500 through a pipeline.

[0090] Preferably, the oil extraction port 210 of the oil dispensing device of the present invention includes two types of interfaces. The first type of interface is directly connected to the online chromatograph and can be matched with the online chromatograph; the second type of interface can be used for sampling the desktop chromatograph, which is convenient for comparative tests. The number of interfaces and the amount of oil both achieve the purpose of calibrating the instrument with one standard oil and simultaneously carrying out calibration of multiple online chromatograph monitoring systems.

[0091] Preferably, the box 500 of the oil dispensing device of the present invention is designed with all stainless steel, and an operation interface can be set outside the box 500, and the operation interface adopts a color liquid crystal graphical touch control technology for human-computer interaction. The operation interface is preferably located in front of the oil dispensing device, in the upper position, to facilitate input of operation instructions.

[0092] Preferably, the oil dispensing device of the present invention has a pulley 510 at the bottom of the box 500, so that the oil dispensing device is movable, can meet the requirements of laboratory and on-site analysis at the same time, is simple and convenient to carry, and is easy to move.

[0093] The oil distribution device of the present invention can be compared with a laboratory insulating oil chromatograph to verify the accuracy of the oil distribution device, and combined with field tests of business projects, the various functions and performances of the oil distribution device can be optimized and improved.

[0094] The oil preparation device for online transformer oil chromatograph calibration oil of the present invention can ensure high-quality calibration work and is a set of accurate, efficient and portable standard oil preparation devices. The implementation and application of the present invention can reverse the passive situation in online monitoring of transformer calibration, improve the efficiency of calibration work, shorten the offline time of online devices, and significantly improve the safe operation level of substation equipment.

[0095] The present invention also provides an oil preparation method for online transformer oil chromatograph calibration oil, the oil preparation method uses the above-mentioned online transformer oil chromatograph calibration oil preparation device, the oil preparation method comprises the steps of:

[0096] Step S 1 , opening the oil filling port 110, and starting the degassing device 160 to generate negative pressure, so that the original oil sample of the transformer oil flows into the oil distribution cylinder 100;

[0097] Step S 2 , close the oil filling port 110, keep the degassing device 160 started, discharge the impurities in the original oil sample, and close the degassing device 160 when the negative pressure approaches negative one atmospheric pressure;

[0098] Step S 3 , open the gas injection port of the air inlet pipeline 120, inject characteristic gas into the transformer oil, and when the pressure reaches 0.2-0.3 atmospheres, close the gas injection port;

[0099] Step S 4 , turn on the temperature control device 400, turn on the circulation pump 300, and the transformer oil circulates in the oil distribution circuit; when the air pressure drops, open the gas injection port of the air inlet pipeline 120 and inject the characteristic gas; after circulating for 20 to 30 minutes, the gas in the transformer oil is fully saturated and evenly distributed, and the configuration of the transformer oil chromatograph calibration oil is completed.

[0100] The steps of the oil dispensing method of the present invention can be repeated multiple times by changing the steps in step S. 3 The concentration of characteristic gas is injected into the transformer oil, and oil samples with low, medium and high concentrations are prepared in turn.

[0101] When mixing oil, it should be mixed from low concentration content to high concentration content in sequence to prevent the characteristic gas oil sample of high concentration content from affecting the characteristic gas oil sample of low concentration content.

[0102] In step S 2 When the negative pressure is close to negative one atmosphere, it can be considered that the gas in the oil has basically escaped, and this oil is the empty cup oil to be prepared.

[0103] At room temperature, the saturated gas content of general insulating oil is about 10%-13%. Under negative pressure conditions, open the characteristic gas source and inject the characteristic gas into the transformer oil. When it reaches 0.2-0.3 atmospheres, close the gas injection port.

[0104] Preferably, after the configuration of the transformer oil chromatograph calibration oil is completed, the oil distribution device is in positive pressure and simulates the transformer body pressure. Under positive pressure conditions, the prepared oil sample can be directly connected to the chromatograph and the external oil storage container.

[0105] Preferably, the oil dispensing device of the present invention is provided with an oil intake port 210, and three parallel oil discharge valves are provided on the oil intake port 210. When the first oil discharge valve is opened, the oil sample automatically flows into the chromatograph for testing. When the second oil discharge valve is opened, the oil sample automatically flows into the external oil storage container. When the third oil discharge valve is opened, the oil sample enters the sealed sampling syringe.

[0106] The oil dispensing device and method for calibrating oil for online transformer oil chromatograph of the present invention circulates oil through the oil dispensing circuit, and the temperature regulating device 400 controls the temperature of the oil, so as to achieve the dispersed absorption and centralized mixing of characteristic gas in transformer oil. The setting of the spray device 140 realizes the leaching gas replenishment mode, so that the gas dissolves more fully and quickly, which is conducive to the rapid oil dispensing on site. The setting of the degassing pipeline 150 and the degassing device 160 enables the oil dispensing device to have the function of blank oil preparation. By equipping the characteristic gas source with three different gas concentration contents of high, medium and low, it can prepare standard oil samples of different concentrations according to the on-site needs of users.

[0107] Although the specific embodiments of the present invention are described above, it should be understood by those skilled in the art that these are only examples, and the protection scope of the present invention is defined by the appended claims. Those skilled in the art may make various changes or modifications to these embodiments without departing from the principles and essence of the present invention, but these changes and modifications all fall within the protection scope of the present invention.

Claims

1. An oil dispensing device for online transformer oil chromatograph calibration oil, characterized in that: The oil distribution device includes an oil distribution cylinder, an oil storage cylinder, a circulation pump, a temperature regulating device and a box. The oil distribution cylinder, the circulating pump, the oil storage cylinder, and the temperature regulating device are connected in series in sequence through pipelines to form an oil distribution circuit, and the oil distribution circuit is arranged in a box; The transformer oil circulates in the oil distribution circuit, the circulating pump is used to provide power for the transformer oil to circulate, and the temperature regulating device is used to regulate the temperature of the transformer oil; The oil distribution cylinder is provided with an oil filling port and an air intake pipeline, and the outlet of the air intake pipeline extends to the bottom of the oil distribution cylinder.

2. The oil dispensing device for online transformer oil chromatograph calibration oil according to claim 1, characterized in that: An oil inlet is arranged at the upper part of the oil distribution cylinder, the oil inlet is communicated with the oil distribution circuit, and a spray device is arranged at the oil inlet.

3. The oil dispensing device for online transformer oil chromatograph calibration oil according to claim 1, characterized in that: The oil distribution device further comprises a degassing pipeline, one end of which is connected to the oil distribution cylinder, and the other end of which is connected to the outside of the box, and a degassing device is arranged on the degassing pipeline.

4. The oil dispensing device for online transformer oil chromatograph calibration oil according to claim 1, characterized in that: The oil distribution cylinder and / or the oil storage cylinder are provided with a pressure sensor.

5. The oil dispensing device for online transformer oil chromatograph calibration oil according to claim 1, characterized in that: The oil storage cylinder is provided with a constant temperature balancing component to maintain the temperature of the transformer oil within a set range.

6. The oil dispensing device for online transformer oil chromatograph calibration oil according to claim 5, characterized in that: The oil storage cylinder is also provided with a temperature sensor.

7. The oil dispensing device for online transformer oil chromatograph calibration oil according to claim 1, characterized in that: The inlet of the air intake pipeline is connected to a gas source of characteristic gas.

8. The oil dispensing device for online transformer oil chromatograph calibration oil as claimed in claim 7, characterized in that: The characteristic gases include H2, CO, CO2, CH4, C2H4, C2H6 and C2H2.

9. The oil dispensing device for online transformer oil chromatograph calibration oil according to claim 8, characterized in that: The gas source of the characteristic gas includes a gas source of a first concentration characteristic gas, a gas source of a second concentration characteristic gas, and a gas source of a third concentration characteristic gas. The contents of the first concentration characteristic gas are H2: 5uL / L, CO: 15uL / L, CO2: 200uL / L, CH4: 0.5uL / L, C2H4: 0.5uL / L, C2H6: 0.5uL / L and C2H2: 0.5uL / L; The contents of the second concentration characteristic gas are H2: 150uL / L, CO: 200uL / L, CO2: 800uL / L, CH4: 5uL / L, C2H4: 5uL / L, C2H6: 5uL / L and C2H2: 5uL / L; The contents of the third concentration characteristic gas are H2: 1000uL / L, CO: 1000uL / L, CO2: 4000uL / L, CH4: 50uL / L, C2H4: 50uL / L, C2H6: 50uL / L and C2H2: 50uL / L.

10. A method for preparing oil for calibration of online transformer oil chromatograph, characterized in that: The oil dispensing method uses the oil dispensing device for online transformer oil chromatograph calibration oil according to any one of claims 1 to 9, and the oil dispensing method comprises the steps of: S1. Open the oil filling port and start the degassing device to generate negative pressure, so that the original oil sample of the transformer oil flows into the oil distribution cylinder; S2. Close the oil filling port and keep the degassing device started to discharge the impurities in the original oil sample. When the negative pressure reaches negative one atmosphere, close the degassing device. S3, open the gas injection port of the air inlet pipeline, inject characteristic gas into the transformer oil, and when the pressure reaches 0.2-0.3 atmospheres, close the gas injection port; S4. Turn on the temperature control device and the circulation pump, and the transformer oil circulates in the oil distribution circuit. When the air pressure drops, open the air injection port of the air inlet pipeline and inject the characteristic gas. After circulating for 20 to 30 minutes, the gas in the transformer oil is fully saturated and evenly distributed, and the configuration of the transformer oil chromatograph calibration oil is completed.

Images