CN111584201A - Liquid compensation system of natural ester transformer - Google Patents
Liquid compensation system of natural ester transformer Download PDFInfo
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- CN111584201A CN111584201A CN202010550836.4A CN202010550836A CN111584201A CN 111584201 A CN111584201 A CN 111584201A CN 202010550836 A CN202010550836 A CN 202010550836A CN 111584201 A CN111584201 A CN 111584201A
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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
- H01F27/10—Liquid cooling
- H01F27/12—Oil cooling
- H01F27/14—Expansion chambers; Oil conservators; Gas cushions; Arrangements for purifying, drying, or filling
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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
- H01F27/40—Structural association with built-in electric component, e.g. fuse
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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
- H01F27/40—Structural association with built-in electric component, e.g. fuse
- H01F27/402—Association of measuring or protective means
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- Power Engineering (AREA)
- Housings And Mounting Of Transformers (AREA)
Abstract
The liquid compensation system of the natural ester transformer comprises an oil tank and an oil conservator, wherein the space in the oil conservator provides an expansion space for natural ester insulating oil, and the volume V for filling the natural ester insulating oil in the oil tank and the lowest value T of the operating temperature T of the transformer are obtained1And the maximum value T2(ii) a Dividing the movement temperature interval of the natural ester insulating oil into three intervals, and respectively substituting the expansion coefficients of the three intervals into a formula: v1＝V*[(t1‑T1)*Y1+(t2‑t1)*Y2+(T2‑t2)*Y3]The volume V of the oil conservator is obtained by middle calculation1And a pipeline system for communicating the oil storage cabinet and the oil tank is provided with a fault alarm device which is triggered when the natural ester insulating oil is abnormally used. The invention can accurately obtain the expansion space required by the oil conservator and reduce the cost.
Description
Technical Field
The invention relates to the field of power transformer products, in particular to a liquid compensation system of a natural ester transformer.
Background
The existing low-voltage products do not have the process requirement of vacuumizing on site, so that the product performance is relatively low, and along with the gradual improvement of the product performance requirement of users, the popularization of the field process requirements such as vacuumizing and the like, particularly the requirements on pressure balance and protection are gradually embodied. The prior art and related product structures have the following drawbacks when applied to natural ester transformers: firstly, the oil conservator is simple in design, and is designed according to the maximum expansion coefficient of natural ester insulating oil, so that the oil conservator is large in size, the oil conservator with large size not only causes waste of space, but also increases the difficulty of matching and mounting the oil conservator and an oil tank due to large size, and meanwhile, the oil conservator with large size reduces the insulation distance of a charged body of a transformer, so that the potential safety hazard exists in the transformer; the natural ester insulating oil is different from the mineral oil, compared with the mineral oil, the natural ester insulating oil cannot be in direct contact with air, is easy to oxidize and has high viscosity, and the expansion coefficient of the natural ester insulating oil is not a fixed coefficient, so that the existing liquid level compensation and protection system of the transformer using the mineral oil is directly used, and the pressure balance of the transformer using the natural ester insulating oil is not favorably realized; thirdly, a complete protection system for protecting the natural ester insulating oil is not arranged, once a fault occurs, no related protection equipment exists, and if the fault cannot be found in time, the natural ester insulating oil is oxidized and deteriorated, the performance is reduced, and the normal operation of the transformer is seriously endangered.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provide a liquid compensation system which occupies less space and is suitable for a transformer of natural ester insulating oil.
In order to achieve the purpose, the invention adopts the following technical scheme:
a liquid compensation system of a natural ester transformer comprises an oil tank and an oil storage cabinet arranged at the upper part of the oil tank, wherein a pipeline system is arranged between the oil storage cabinet and the oil tank, natural ester insulating oil in the oil storage cabinet is communicated with natural ester insulating oil in the oil tank through the pipeline system, and a space in the oil storage cabinet provides compensation and expansion space for the natural ester insulating oil;
obtaining the volume V for filling the natural ester insulating oil in the oil tank and the lowest value T of the operating temperature T of the transformer1And the maximum value T2；
The operating temperature t of the natural ester insulating oil filled in the oil tank is t0-tNBetween, select the temperature t1、t2And t is0＜t1＜t2＜tNSaid temperature t1、t2Dividing the operating temperature interval of the natural ester insulating oil into three temperature intervals, wherein the temperature intervals are t0-t1Section, t1-t2Section, t2-tNInterval, lowest value T of transformer operation temperature1Falls into t0-t1Interval, maximum value T2Fall in the same time t2-tNInterval, obtaining t at the same time0-t1Section, t1-t2Section, t2-tNCoefficient of expansion Y of interval natural ester insulating oil1，Y2、Y3The volume V of the oil conservator (1) is obtained by calculation according to the formula (I)1：
V1＝V*[(t1-T1)*Y1+(t2-t1)*Y2+(T2-t2)*Y3](I)。
Further, at different operating temperatures t, the expansion coefficient Y of the natural ester insulating oil filled in the oil tank satisfies the following formula:
Y＝0.00075+0.0000065*(t+20) (II)；
wherein the operating temperatures t are taken as t0-t1Intermediate temperature value t of interval1-t2Intermediate temperature value t of interval2-tNSubstituting the intermediate temperature value of the interval into the formula (II) to calculate the t of the natural ester insulating oil0-t1Coefficient of expansion Y of interval natural ester insulating oil1，t1-t2Coefficient of expansion Y of interval natural ester insulating oil2And t2-tNCoefficient of expansion Y of interval natural ester insulating oil3。
Further, t may be1-t2Dividing the interval into 2-6 intervals, substituting the intermediate temperature value of each interval into formula (II) to obtain the expansion coefficient of each interval, obtaining the average value Y 'of the sum of the expansion coefficients of all the intervals, and using Y' to replace Y2Substituted into formula (I).
Furthermore, a pipeline system for communicating the oil storage cabinet with the oil tank is provided with a fault alarm device.
Further, the fault alarm equipment comprises a gas relay, the gas relay is provided with a gas acquisition and analysis module and an alarm module, and when the gas acquisition and analysis module detects that the natural ester insulating oil is abnormally decomposed, the alarm module of the gas relay is triggered to give an alarm.
Further, the malfunction alerting device includes a blocking valve which is maintained in an open state during normal use of the piping system, and which is automatically closed when the blocking valve detects leakage of the fuel tank.
Further, pipe-line system is including the trunk line that is provided with the malfunction alerting device and the reserve pipeline parallelly connected with the trunk line, the trunk line is connected between conservator and oil tank, the trunk line is connected respectively at the trunk line at malfunction alerting device both ends at the both ends of reserve pipeline, and the reserve pipeline is equipped with closing means, closing means is opened when the trunk line is in the closure state, makes conservator and oil tank pass through the reserve pipeline and is put through temporarily.
Further, be provided with capsule protection device in the oil conservator, capsule protection device is used for making the insulating oil of natural ester in the oil conservator keep apart with the air, and capsule protection device is including sealed capsule and the alarm device that reveals the capsule intussuseption is filled with gas and makes the capsule float and set up on the surface of insulating oil of natural ester, triggers when the capsule takes place to reveal that the alarm device that reveals sends out the police dispatch newspaper.
Further, reveal alarm device includes liquid sensor, alarm unit and control cable, control cable connects between alarm unit and liquid sensor, inside liquid sensor stretched into the capsule, alarm unit set up outside the oil conservator, detected the capsule and took place to reveal after alarm unit transmission reveal the signal and send out the police dispatch newspaper by alarm unit at liquid sensor.
Further, the leakage alarm device comprises a gas sensor, an alarm unit and a control cable which are arranged in the oil conservator, wherein the gas sensor is connected with the alarm unit through the control cable; the gas sensor is located oil conservator lateral wall bottom, gas sensor's sense terminal floats in the insulating oil surface of natural ester and between capsule and the insulating oil of natural ester, and after the capsule takes place to reveal, when the sense terminal detects that the gas content in the oil conservator reaches certain volume, gas sensor passes through control cable case alarm unit transmission and reveals the signal and has alarm unit to send out the police dispatch newspaper.
According to the liquid compensation system of the natural ester transformer, the oil conservator provides compensation and expansion space for the natural ester insulating oil in the oil tank, the operating temperature of the natural ester insulating oil is divided into three intervals, the volume of the oil conservator is calculated according to the expansion coefficient of each interval, the space required by the oil conservator can be accurately calculated, the oil conservator with more redundant space is avoided being designed, the design cost of the oil conservator is reduced, and the design process of the volume of the oil conservator is simplified. Compared with the existing oil conservator obtained through rough estimation, the liquid compensation system of the natural ester transformer can provide expansion space for the natural ester insulating oil in terms of volume, does not occupy too much space due to redundant expansion space, is beneficial to reducing cost and improving the safety of the transformer; the oil storage cabinet is arranged at the upper part of the oil tank, partial natural ester insulating oil is filled in the oil storage cabinet, and the oil tank is ensured to be filled with the natural ester insulating oil all the time; and a fault alarm device is further arranged on a pipeline system between the oil storage cabinet and the oil tank and is triggered when the natural ester insulating oil is abnormal in use.
In addition, the fault alarm device comprises a gas relay and a stop valve, wherein the gas relay gives an alarm when the natural ester insulating oil is abnormally decomposed, and the stop valve is automatically closed when the oil tank leaks; be provided with the capsule protection device who is used for making the insulating oil of natural ester keep isolated air in the oil conservator, capsule protection device can avoid insulating oil of natural ester and air contact, avoids the rotten of insulating oil of natural ester, and the capsule among the capsule protection device can trigger after taking place to reveal simultaneously and reveal alarm device, does benefit to in time maintenance, has guaranteed the operation safety of transformer.
Drawings
FIG. 1 is a schematic diagram of a liquid compensation system of a natural ester transformer according to the present invention;
FIG. 2 is a schematic diagram of a liquid compensation system of a natural ester transformer according to the present invention;
FIG. 3 is a schematic diagram of a liquid compensation system of a natural ester transformer according to the present invention;
FIG. 4 is a schematic diagram of a capsule protection device in a liquid compensation system of a natural ester transformer according to the present invention;
fig. 5 is a schematic structural diagram of a capsule protection device in a liquid compensation system of a natural ester transformer according to the present invention.
Detailed Description
The following describes the design method of the conservator 1 of the transformer in detail, and further describes a specific embodiment of the liquid compensation system of the natural ester transformer in accordance with the embodiments shown in fig. 1 to 5. The liquid compensation system of a natural ester transformer of the present invention is not limited to the description of the following embodiments.
A liquid compensation system of a natural ester transformer comprises an oil tank 2 and an oil conservator 1 arranged at the upper part of the oil tank 2, wherein a pipeline system is arranged between the oil conservator 1 and the oil tank 2, natural ester insulating oil in the oil conservator 1 is communicated with natural ester insulating oil in the oil tank 2 through the pipeline system, and a space in the oil conservator 1 provides a compensation and expansion space for the natural ester insulating oil;
obtaining the volume V for filling the natural ester insulating oil in the oil tank 2 and the lowest value T of the operating temperature T of the transformer1And the maximum value T2；
The natural ester insulating oil filled in the oil tank 2 has an operating temperature t at t0-tNBetween, select the temperature t1、t2And t is0＜t1＜t2＜tNSaid temperature t1、t2Dividing the operating temperature interval of the natural ester insulating oil into three temperature intervals, wherein the temperature intervals are t0-t1Section, t1-t2Section, t2-tNInterval, lowest value T of transformer operation temperature1Falls into t0-t1Interval, maximum value T2Fall in the same time t2-tNInterval, obtaining t at the same time0-t1Section, t1-t2Section, t2-tNCoefficient of expansion Y of interval natural ester insulating oil1，Y2、Y3The volume V of the oil conservator (1) is obtained by calculation according to the formula (I)1：
V1＝V*[(t1-T1)*Y1+(t2-t1)*Y2+(T2-t2)*Y3](I)。
According to the liquid compensation system of the natural ester transformer, the oil conservator 1 provides compensation and expansion space for the natural ester insulating oil in the oil tank 2, the operating temperature of the natural ester insulating oil is divided into three intervals, the volume of the oil conservator 1 is calculated according to the expansion coefficient of each interval, the space required by the oil conservator 1 can be accurately calculated, the oil conservator 1 with more redundant space is prevented from being designed, the design cost of the oil conservator 1 is reduced, and the design process of the volume of the oil conservator 1 is simplified.
Providing an optimal embodiment, obtaining the minimum value T of the volume V for filling the natural ester insulating oil in the oil tank 2 and the operating temperature T of the transformer1And the maximum value T2；
The natural ester insulating oil filled in the oil tank 2 has an operating temperature t at t0-tNThe temperature t is selected by the transformer1、t2And t is0＜t1＜t2＜tNSaid temperature t1、t2Dividing the operating temperature interval of the natural ester insulating oil into three temperature intervals, wherein the temperature intervals are t0-t1Section, t1-t2Section, t2-tNInterval, lowest value T of transformer operation temperature1Falls into t0-t1Interval, maximum value T2Fall in the same time t2-tNInterval, obtaining t at the same time0-t1Section, t1-t2Section, t2-tNCoefficient of expansion Y of interval natural ester insulating oil1，Y2、Y3Calculating according to formula (I) to obtain volume V of oil conservator 11：
V1＝V*[(t1-T1)*Y1+(t2-t1)*Y2+(T2-t2)*Y3](I)。
Generally, the minimum operating temperature of the transformerT1At-20 ℃ and a maximum operating temperature T2At 120 deg.C, the natural ester insulating oil is a soybean-based natural ester insulating oil filled in the oil tank 2 at an operating temperature t0-tNIn which t is0And the lowest operating temperature T of the transformer1Are equal, i.e. t0＝T1＝-20℃；tNTemperature of and maximum operating temperature T of the transformer2Are equal, i.e. tN＝T2120 deg.c. Preference is given to t1＝40℃，t280 ℃ at this time t0-t1Section, t1-t2Section, t2-tNThe intervals are respectively-20 ℃ to 40 ℃, 40 ℃ to 80 ℃ and 80 ℃ to 120 ℃.
Obtaining the expansion coefficients Y of three stages1、Y2And Y3The expansion coefficient Y can be obtained by a plurality of measurements or by calculation. The expansion coefficient Y in the present invention can be optionally obtained by formula (II),
Y＝0.00075+0.0000065*(t+20) (II)；
in formula (II), t represents the operating temperature of the natural ester insulating oil. At the calculation of t0-t1When the expansion coefficient of the interval is Y1, t is selected0-t1The intermediate values of the intervals are substituted into formula (II), and the intermediate values of-20 ℃ to 40 ℃ are substituted into 10 ℃ in the present invention, to obtain Y1 ═ 0.000945; at the calculation of t1-t2When the expansion coefficient of the interval is Y2, t is selected1-t2Substituting the intermediate values of the intervals into formula (II), and substituting the intermediate values of 40 ℃ to 80 ℃ at 60 ℃ to obtain Y2 ═ 0.00114; at the calculation of t2-tNWhen the expansion coefficient of the interval is Y3, t is selected2-tNIntermediate values of the interval are substituted into formula (II) intermediate values between 80 ℃ and 120 ℃ are substituted to obtain Y3 ═ 0.0014; the calculated Y1, Y2, and Y3 were substituted into formula (I) to obtain V1 ═ V (60 × 0.000945+40 × 0.00114+40 × 0.0014) ═ 0.1583V.
The invention preferably obtains t by multiple measurements0-t1Section, t1-t2Section, t2-tNCoefficient of expansion Y of interval1、Y2、Y3Namely the expansion coefficients of 0.000767, 0.000797 and 0.000825 in three ranges of-20 to 40 ℃, 40 to 80 ℃ and 80 to 120 ℃ respectively, and the Y is1、Y2、Y3Substituting into formula (I), V is calculated to be 0.1111 × V. It should be noted that there is a certain range of error between the measured value and the result obtained by calculation according to the formula, especially there is a certain range of error between the result obtained by splitting the formula, but it is needless to say that the result obtained by calculation according to the formula is more accurate.
Of course t1、t2Other temperature values are also possible, the three temperature intervals can be unequal in triplicate, and t can be preferably adjusted1-t2Dividing the interval into 2-6 intervals, substituting the intermediate temperature value of each interval into formula (II) to obtain the expansion coefficient of each interval, obtaining the average value Y 'of the sum of the expansion coefficients of all the intervals, and using Y' to replace Y2Substituted into formula (I). Of course t1-t2Intervals may also be divided into more intervals.
As shown in fig. 1-5, a liquid compensation system of a transformer comprises an oil tank 2 and an oil conservator 1 designed and obtained based on the above formula, wherein a part of natural ester insulating oil is filled in the oil conservator 1 and the natural ester insulating oil in the oil conservator 1 is isolated from air, the oil conservator 1 is arranged on the upper part of the oil tank 2, a pipeline system is arranged between the oil conservator 1 and the oil tank 2, the natural ester insulating oil in the oil conservator 1 and the natural ester insulating oil in the oil tank 2 are kept communicated through the pipeline system, the space in the oil conservator 1 provides an expansion space for the natural ester insulating oil, a fault alarm device is arranged on the pipeline system communicating the oil conservator 1 and the oil tank 2, and the fault alarm device is triggered when the natural ester insulating oil is used abnormally.
Compared with the existing oil conservator 1 obtained through rough estimation, the oil conservator 1 can provide expansion space for natural ester insulating oil in terms of volume, and can not occupy too much space due to redundant expansion space, thereby being beneficial to reducing cost and improving the safety of a transformer; the oil conservator 1 is arranged at the upper part of the oil tank 2, and partial natural ester insulating oil is filled in the oil conservator 1, so that the oil tank 2 is ensured to be filled with the natural ester insulating oil all the time; a fault alarm device is arranged on a pipeline system between the oil conservator 1 and the oil tank 2 and is triggered when the natural ester insulating oil is abnormally used.
Referring to fig. 1-5 in detail, a liquid compensation system for a transformer comprises an oil conservator 1 filled with a part of natural ester insulating oil, wherein the natural ester insulating oil in the oil conservator 1 is used for isolating air to avoid deterioration after contacting with air, and a capsule protection device which can isolate the natural ester insulating oil from air is preferably arranged in the oil conservator 1; the oil conservator 1 is arranged on the upper part of the oil tank 2, a pipeline system is arranged between the oil conservator 1 and the oil tank 2, the natural ester insulating oil in the oil conservator 1 is communicated with the natural ester insulating oil in the oil tank 2 through the pipeline system, the space in the oil conservator 1 provides an expansion space for the natural ester insulating oil, the oil conservator 1 is arranged on the upper part of the oil tank 2 and ensures that the oil tank 2 is communicated with the oil conservator 1, as part of the natural ester insulating oil is always filled in the oil conservator 1, the natural ester insulating oil in the oil tank 2 can be ensured to be always in a filling state, the natural ester insulating oil in the oil tank 2 can be ensured not to be contacted with air only by ensuring that the oil conservator 1 is isolated from the air, a fault alarm device is arranged on the pipeline system for communicating the oil conservator 1 and the oil tank 2, the fault alarm device can be triggered when the natural ester insulating oil, the staff can find the fault in time.
Preferably, as shown in fig. 1-3, the pipeline system includes a main pipeline 31 provided with a fault alarm device and a spare pipeline 32 connected in parallel with the main pipeline 31, the main pipeline 31 is connected between the oil conservator 1 and the oil tank 2, two ends of the spare pipeline 32 are respectively connected to the main pipelines 31 at two ends of the fault protection system, the spare pipeline 32 is provided with a closing device, the closing device is opened when the main pipeline 31 is in a closed state, so that the oil conservator 1 and the oil tank 2 are temporarily connected through the spare pipeline 32, it is ensured that the transformer can operate without power failure during periodic detection and maintenance, preferably, butterfly valves are arranged on the main pipelines 31 at two ends of the fault alarm system, and a ball valve is arranged on the spare pipeline 32; when the main pipeline 31 normally runs, the butterfly valve of the main pipeline 31 is opened to enable the main pipeline 31 to normally run, and the ball valve is closed to enable the standby pipeline 32 to be closed; when regular detection and maintenance are carried out, the main pipeline 31 is closed by closing the butterfly valve and opening the ball valve, and the oil tank 2 is communicated with the oil conservator 1 through the standby pipeline 32.
The fault alarm device comprises a gas relay 41 and a cut-off valve 42, wherein the gas relay 41 is positioned on one side close to the oil tank 2, the cut-off valve 42 is positioned on one side close to the oil conservator 1, the gas relay 41 is provided with a gas acquisition and analysis module and an alarm module, when the gas acquisition and analysis module detects that the natural ester insulating oil is abnormally decomposed, the alarm module of the gas relay 41 is triggered to give an alarm, and the principle is as follows: because the natural ester insulating oil and the transformer can run together for about 30-50 years, molecules of the natural ester insulating oil can be naturally or faulted under high temperature and high voltage in the transformer, the components of gas generated by the fault decomposition and the natural decomposition are different, the gas acquisition and analysis module of the gas relay 41 can provide gas collection and quantitative alarm of the part, and when the fault gas is accumulated to a certain amount, the alarm module of the gas relay 41 is triggered to send out an alarm signal so that maintenance personnel can judge the fault.
The shut-off valve 42 is kept open during normal use of the piping system, and the shut-off valve 42 is automatically closed when the shut-off valve 42 detects leakage from the fuel tank 2. When the flow rate of the natural ester insulating oil in the piping system exceeds the preset value of the shut-off valve 42 at the preset value of the shut-off valve 42, the shut-off valve 42 is triggered to automatically close due to a pressure difference generated when the natural ester insulating oil flows, and an alarm is given, the shut-off valve 42 is closed only when the flow rate of the natural ester insulating oil is too high, and the flow rate is considered to be too high as leakage; when the flow rate of the natural ester insulating oil is below a predetermined value, the shut-off valve 42 is maintained in an open state for ensuring a normal flow of the natural ester insulating oil due to thermal expansion and contraction. Of course, the shut-off valve 42 is provided with a flow rate adjusting device, and the activation setting value of the shut-off valve 42 can be adjusted according to the toilet differential pressure or the installation convention. The shut-off valve 42 is of the COMEM company model RDR MK type II shut-off valve 42.
Preferably, a capsule protection device is arranged in the oil conservator 1, the capsule protection device is used for keeping the natural ester insulating oil in the oil conservator 1 isolated from the air, the capsule protection device comprises a sealed capsule 51 and a leakage alarm device, the capsule 51 is filled with gas and enables the capsule 51 to float on the surface of the natural ester insulating oil, the capsule 51 is similar to a balloon, the inlet of the capsule 51 is communicated with the outside, air is normally filled in the capsule 51, so that the inlet of the capsule 51 can be directly communicated with the air, the capsule 51 plays a role of balancing the oil conservator 1 with the atmospheric pressure, when the natural ester insulating oil in the transformer expands, the oil in the oil conservator 1 increases to exhaust the gas in the capsule 51, when the temperature of the transformer decreases, the natural ester insulating oil contracts, the oil in the oil conservator 1 decreases, and the capsule 51 is influenced by negative pressure, air is initially inhaled to inflate the capsule 51. Normally, the capsule 51 is filled with dry gas, and a drying device 54 is preferably provided to keep the gas in the capsule 51 dry, and when the capsule 51 leaks, a leakage alarm device is triggered to give an alarm, and the alarm principle of the leakage alarm device is divided into two principles.
A first leakage warning device is provided, as shown in fig. 4, the leakage warning device includes a liquid sensor 52, a warning unit and a control cable, the control cable is connected between the warning unit and the liquid sensor 52, the liquid sensor 52 extends into the capsule 51, the warning unit is disposed outside the oil conservator 1, and an oil level gauge is disposed inside the oil conservator 1. When the capsule 51 leaks, part of the natural ester insulating oil entering the capsule 51 triggers the liquid sensor 52, and the liquid sensor 52 detects the leakage of the capsule 51, transmits a leakage signal to the alarm unit and sends an alarm.
Providing a second leakage alarm device, as shown in fig. 5, wherein the leakage alarm device comprises a gas sensor 53, an alarm unit and a control cable which are arranged in the oil conservator 1, and the gas sensor 53 is connected with the alarm unit through the control cable; gas sensor 53 is located the lateral wall bottom of conservator 1, gas sensor 53's sense terminal floats in the insulating oily surface of natural ester and between capsule 51 and the insulating oil of natural ester, and the sense terminal can change along with the insulating oily level change of natural ester, and after capsule 51 took place to reveal, the air flowed in conservator 1, when the sense terminal detected the gas content in conservator 1 and reached certain volume, was used for detecting the volume of air usually, and gas sensor 53 passed through control cable case alarm unit transmission and revealed the signal and had alarm unit to send out the police dispatch newspaper.
The foregoing is a more detailed description of the invention in connection with specific preferred embodiments and it is not intended that the invention be limited to these specific details. For those skilled in the art to which the invention pertains, several simple deductions or substitutions can be made without departing from the spirit of the invention, and all shall be considered as belonging to the protection scope of the invention.
Claims (10)
1. A liquid compensation system of a natural ester transformer is characterized in that:
the oil storage tank comprises an oil tank (2) and an oil storage cabinet (1) arranged at the upper part of the oil tank (2), wherein a pipeline system is arranged between the oil storage cabinet (1) and the oil tank (2), natural ester insulating oil in the oil storage cabinet (1) and natural ester insulating oil in the oil tank (2) are communicated through the pipeline system, and a compensation and expansion space is provided for the natural ester insulating oil in the oil storage cabinet (1);
obtaining the volume V for filling the natural ester insulating oil in the oil tank (2) and the lowest value T of the operating temperature T of the transformer1And the maximum value T2；
The natural ester insulating oil filled in the oil tank (2) has an operating temperature t at t0-tNBetween, select the temperature t1、t2And t is0＜t1＜t2＜tNSaid temperature t1、t2Dividing the operating temperature interval of the natural ester insulating oil into three temperature intervals, wherein the temperature intervals are t0-t1Section, t1-t2Section, t2-tNInterval, lowest value T of transformer operation temperature1Falls into t0-t1Interval, maximum value T2Fall in the same time t2-tNInterval, obtaining t at the same time0-t1Section, t1-t2Section, t2-tNCoefficient of expansion Y of interval natural ester insulating oil1，Y2、Y3The volume V of the oil conservator (1) is obtained by calculation according to the formula (I)1：
V1＝V*[(t1-T1)*Y1+(t2-t1)*Y2+(T2-t2)*Y3](I)。
2. The liquid compensation system of a natural ester transformer according to claim 1, wherein the expansion coefficient Y of the natural ester insulating oil filled in the oil tank (2) satisfies the following formula at different operating temperatures t:
Y＝0.00075+0.0000065*(t+20) (II)；
wherein the operating temperatures t are taken as t0-t1Intermediate temperature value t of interval1-t2Intermediate temperature value t of interval2-tNSubstituting the intermediate temperature value of the interval into the formula (II) to calculate the t of the natural ester insulating oil0-t1Coefficient of expansion Y of interval natural ester insulating oil1，t1-t2Coefficient of expansion Y of interval natural ester insulating oil2And t2-tNCoefficient of expansion Y of interval natural ester insulating oil3。
3. The liquid compensation system of a natural ester transformer of claim 2, wherein: can be used for converting t1-t2Dividing the interval into 2-6 intervals, substituting the intermediate temperature value of each interval into formula (II) to obtain the expansion coefficient of each interval, obtaining the average value Y 'of the sum of the expansion coefficients of all the intervals, and using Y' to replace Y2Substituted into formula (I).
4. The liquid compensation system of a natural ester transformer of claim 1, wherein: and a pipeline system for communicating the oil storage cabinet (1) and the oil tank (2) is provided with a fault alarm device.
5. The liquid compensation system of the natural ester transformer according to claim 4, wherein the fault alarm device comprises a gas relay (41), the gas relay (41) is provided with a gas collection and analysis module and an alarm module, and the alarm module of the gas relay (41) is triggered to give an alarm when the gas collection and analysis module detects that the natural ester insulating oil is abnormally decomposed.
6. A liquid compensation system for a natural ester transformer according to claim 4, characterized in that said fault alarm device comprises a shut-off valve (42), said shut-off valve (42) being kept open during normal use of the piping system, the shut-off valve (42) being automatically closed when a leak in the tank (2) is detected by the shut-off valve (42).
7. The liquid compensation system of a natural ester transformer of claim 4, wherein: pipeline system is including trunk line (31) that is provided with trouble alarm equipment and with trunk line (31) parallelly connected reserve pipeline (32), trunk line (31) are connected between oil storage tank (1) and oil tank (2), the both ends of reserve pipeline (32) are connected respectively on trunk line (31) at trouble alarm equipment both ends, and reserve pipeline (32) are equipped with closing means, closing means is opened when trunk line (31) are in the closed condition, makes oil storage tank (1) and oil tank (2) through reserve pipeline (32) by temporary switch-on.
8. The liquid compensation system of a natural ester transformer of claim 4, wherein: be provided with capsule protection device in oil conservator (1), capsule protection device is used for making the natural ester insulating oil in oil conservator (1) keep apart with the air, and capsule protection device is including sealed capsule (51) and leak alarm device capsule (51) intussuseption is filled with gas and makes capsule (51) float and set up on the surface of natural ester insulating oil, triggers when capsule (51) take place to reveal that leak alarm device sends out the police dispatch newspaper.
9. The liquid compensation system of a natural ester transformer of claim 8, wherein: reveal alarm device includes liquid sensor (52), alarm unit and control cable, control cable connects between alarm unit and liquid sensor (52), inside liquid sensor (52) stretched into capsule (51), alarm unit set up outside oil conservator (1), detect capsule (51) take place to reveal at liquid sensor (52) and transmit the signal of revealing and send out the police dispatch newspaper to alarm unit after alarm unit.
10. The liquid compensation system of a natural ester transformer of claim 8, wherein: the leakage alarm device comprises a gas sensor (53) arranged in the oil conservator (1), an alarm unit and a control cable, wherein the gas sensor (53) is connected with the alarm unit through the control cable; gas sensor (53) are located oil conservator (1) lateral wall bottom, gas sensor (53)'s sense terminal floats in the insulating oil surface of natural ester and between capsule (51) and natural ester insulating oil, and after capsule (51) take place to reveal, when the sense terminal detects the gas content in oil conservator (1) and reaches certain volume, gas sensor (53) leaked the signal and had alarm unit to send out the police dispatch newspaper through control cable case alarm unit transmission.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010550836.4A CN111584201A (en) | 2020-06-16 | 2020-06-16 | Liquid compensation system of natural ester transformer |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010550836.4A CN111584201A (en) | 2020-06-16 | 2020-06-16 | Liquid compensation system of natural ester transformer |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112765530A (en) * | 2020-12-11 | 2021-05-07 | 国网浙江省电力有限公司绍兴供电公司 | Transformer insulating oil volume expansion calculation method based on different temperature sectional calculation |
| CN114876698A (en) * | 2022-05-09 | 2022-08-09 | 西安热工研究院有限公司 | Quantitative regulating and controlling system for oil level of bearing oil groove of hydroelectric generating set and working method of quantitative regulating and controlling system |
-
2020
- 2020-06-16 CN CN202010550836.4A patent/CN111584201A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112765530A (en) * | 2020-12-11 | 2021-05-07 | 国网浙江省电力有限公司绍兴供电公司 | Transformer insulating oil volume expansion calculation method based on different temperature sectional calculation |
| CN114876698A (en) * | 2022-05-09 | 2022-08-09 | 西安热工研究院有限公司 | Quantitative regulating and controlling system for oil level of bearing oil groove of hydroelectric generating set and working method of quantitative regulating and controlling system |
| CN114876698B (en) * | 2022-05-09 | 2024-05-07 | 西安热工研究院有限公司 | Quantitative regulation and control system for oil level of bearing oil groove of hydroelectric generating set and working method of quantitative regulation and control system |
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