CN112557990A - Online monitoring and diagnosing method for imbalance degree of molar quantity of current transformer - Google Patents
Online monitoring and diagnosing method for imbalance degree of molar quantity of current transformer Download PDFInfo
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Abstract
The invention provides a method, a device and a storage medium for online monitoring and diagnosing imbalance degree of molar quantity of a current transformer, wherein the method comprises the following steps: collecting a gas pressure value and a shell temperature value in a current transformer; calculating the unbalance degree of the molar quantity of the current transformer; and continuously monitoring the unbalance degree of the molar quantity of the current transformer, and diagnosing the equipment state of the current transformer according to a set diagnosis threshold value. By the technical scheme provided by the invention, the 24-hour uninterrupted monitoring of the current transformer is realized on line, the operation and fault states of the current transformer equipment can be evaluated, accidents are prevented, and a feasible means is provided for the real-time monitoring of the operation and fault states of the equipment.
Description
Technical Field
The invention relates to the technical field of on-line monitoring and diagnosis of current transformers, in particular to a method and a device for on-line monitoring and diagnosis of imbalance degree of molar quantity of a current transformer and a storage medium.
Background
A large amount of oil-filled electrical equipment runs in an existing power system, and comprises oil-poor equipment such as a transformer high-voltage bushing, a current transformer and a circuit breaker, and the insulation state of the oil-poor equipment and the running state of an internal mechanism have important significance for safe and stable running of the power system in the running process of a transformer substation. However, these devices may be out of order due to improper manufacturing, maintenance, and oil degradation, and serious accidents such as explosion and fire may occur, which affect the safe and stable operation and power supply reliability of the power grid.
At present, the transformer substation generally adopts manual patrol for maintaining the equipment, and a small part of the equipment can be combined with insulation online monitoring. The manual inspection is that the inspection is performed by using operators and the periodic spot inspection is performed by testers. The traditional detection and analysis method comprises the steps of ultrasonic partial discharge, infrared temperature measurement, oil chromatographic analysis and the like. However, with the continuous improvement of voltage class and the increase of equipment capacity in recent years, the traditional offline preventive test method cannot meet the actual requirement of safe operation of modern large-scale power equipment, and it is difficult to truly reflect the insulation conditions of various types of equipment such as bushings, current transformers and the like under the operation condition. Since the preventive test is carried out according to a fixed period, the preventive test cannot be found, tracked and maintained in time, and has great limitation.
The traditional maintenance method mainly comprises daily detection and power failure detection. Wherein the daily detection comprises component inspection and heating detection; the power failure detection comprises insulation resistance measurement, polarization coefficient measurement, capacitance and dielectric loss factor measurement, partial discharge measurement and transformer oil inspection (a current transformer can be electrified to take oil).
The part inspection in daily maintenance generally detects whether oil leaks, the anticorrosive inspection of metalwork, insulator outward appearance detection, ground connection condition inspection, and for current transformer, still need the flexible volume of inspection expander to confirm the oil level condition. The heating detection is very effective for finding out the thermal defects and hot spots of the oil-poor equipment, and can find out overheating caused by poor contact of contact points or overhigh temperature caused by local defects.
The insulation performance test is carried out by regularly cutting off the power of the oil-less equipment before operation and every few years after operation so as to judge the insulation condition of the oil-less equipment; meanwhile, the gas content and the moisture content in the oil can be measured in the power failure maintenance period, and the analysis and the detection of the dissolved gas in the oil are still one of the methods for fault diagnosis of oil-filled electrical equipment at present.
Although the conventional method adopted at present can detect partial faults, the early diagnosis effect on the faults is poor, the effect of carrying out a partial discharge test on site is not ideal, a current transformer cannot carry out electrified oil extraction analysis, and the method is more difficult when chromatographic analysis data is abnormal and needs to be sampled and tracked. Meanwhile, the periodic detection cannot prevent sudden accidents.
In oil-less equipment such as a high-voltage bushing of a transformer, a current transformer and the like, insulating oil in a sealed state can be decomposed to release a certain amount of gas due to the influence of insulation damage and other reasons in the operation process, the insulating oil of the current transformer is mineral oil obtained by distilling and refining natural petroleum, is a mixture consisting of hydrocarbons with different molecular weights, and comprises alkane, alkene, cycloalkane, aromatic hydrocarbon and the like; when discharge or overheating faults exist in the equipment, characteristic gases such as H2, CH4, C2H6, C2H4, C2H2, CO and CO2 can be generated, the generated gases are dissolved in oil and released to the oil surface, the gases on the oil surface are gradually accumulated due to the fact that the current transformer is of a sealing structure, the gas pressure is increased to act on liquid insulating oil, oil pressure is gradually increased and accumulated for a long time, certain air pressure is formed in the cavity, and oil injection and even explosion can be caused in severe cases. Currently, the detection of characteristic gas mainly comprises two modes: oil gas spectrum analysis and pressure monitoring. Generally, the oil chromatographic analysis is carried out by adopting a manual sampling mode to regularly monitor the content of acetylene, hydrogen and total hydrocarbon dissolved in oil of the oil-less equipment, but the method has a long period, and cannot find the abnormity appearing between two detection intervals, so that potential safety hazards exist.
Disclosure of Invention
The invention mainly aims to provide a method, a device and a storage medium for online monitoring and diagnosing the imbalance degree of the molar quantity of a current transformer, and aims to solve the problems of gas pressure and temperature monitoring and fault diagnosis in the existing current transformer.
In order to achieve the above object, the present invention provides an online monitoring and diagnosing method for imbalance degree of molar quantity of a current transformer, which comprises:
collecting a gas pressure value and a shell temperature value in a current transformer;
calculating the unbalance degree of the molar quantity of the current transformer;
and continuously monitoring the unbalance degree of the molar quantity of the current transformer, and diagnosing the equipment state of the current transformer according to a set diagnosis threshold value.
Further, the calculation formula of the imbalance degree of the molar quantity of the current transformers is as follows:
when the sensor is arranged at the top of the current transformer, the unbalance degree of the molar quantity of the current transformer is as follows:
when the sensor is arranged at the bottom of the current transformer, the unbalance degree of the molar quantity of the current transformer is as follows:
wherein the content of the first and second substances,
Pomax(t)＝max(Poa(t)，Pob(t)，Poc(t))；
Pomin(t)＝min(Poa(t)，Pob(t)，Poc(t))；
Pmax(t)＝max(Pa(t)，Pb(t)，Pc(t))；
Pmin(t)＝min(Pa(t)，Pb(t)，Pc(t))；
ε1(t) the unbalance degree of the molar quantity of the current transformer;
pa (t) is the pressure of oil liquid at the top of the phase A of the current transformer at the moment t;
pb (t) is the pressure of oil liquid at the top of the phase B of the current transformer at the moment t;
pc (t) is the pressure of oil liquid at the top of the C phase of the current transformer at the time t;
Poa (t) is the oil pressure at the bottom of the phase A of the current transformer at the moment t;
Pob (t) is the oil pressure at the bottom of the phase B of the current transformer at the moment t;
Poc (t) is the oil pressure at the bottom of the phase C of the current transformer at the moment t;
Pohand (t) is the equivalent pressure of the oil height in the current transformer at the moment t.
Further, the diagnostic threshold is:
when epsilon1(t) sending an alarm signal when the t is more than or equal to 35 percent;
when the content is 35 percent>ε1(t) when the content is more than or equal to 25%, sending an early warning signal;
when the content is 25 percent>ε1(t) ≧ 15%, a signal of interest is transmitted.
In addition, the invention also provides an online monitoring and diagnosing method for the imbalance degree of the molar quantity of the current transformer, which comprises the following steps:
collecting a gas pressure value and a shell temperature value in the current transformer and the distance from the top of the expander to the distance measuring sensor;
calculating the expander volume;
calculating the unbalance degree of the molar quantity of the current transformer;
and continuously monitoring the unbalance degree of the molar quantity of the current transformer, and diagnosing the equipment state of the current transformer according to a set diagnosis threshold value.
Further, the calculation formula of the expander volume is:
V(t)＝pHp(t)+V1，Hp(t)＝t(t)-c(t)
wherein the content of the first and second substances,
v (t) is the expander volume at time t;
Sp、V1、Htis a constant coefficient;
Hp(t) expander height at time t;
Hc(t) is the distance from the top of the expander to the ranging sensor at time t.
Further, the calculation formula of the imbalance degree of the molar quantity of the current transformers is as follows:
when the sensor is on top of the current transformer,
when the sensor is at the bottom of the current transformer,
similarly, ε can be calculated separatelybc(t)，εac(t)；
Then, the imbalance degree of the molar quantity of the current transformer is as follows:
ε1(t)＝max(|εab(t)|，|εbc(t)|，|εac(t)|)；
wherein epsilon1(t) the unbalance degree of the molar quantity of the current transformer;
pa (t) is the pressure of oil liquid at the top of the phase A of the current transformer at the moment t;
pb (t) is the pressure of oil liquid at the top of the phase B of the current transformer at the moment t;
pc (t) is the pressure of oil liquid at the top of the C phase of the current transformer at the time t;
Poa (t) is the oil pressure at the bottom of the phase A of the current transformer at the moment t;
Pob (t) is the oil pressure at the bottom of the phase B of the current transformer at the moment t;
Poc (t) is the oil pressure at the bottom of the phase C of the current transformer at the moment t;
Pohand (t) is the equivalent pressure of the oil height in the current transformer at the moment t.
In addition, the present invention provides an online monitoring and diagnosing apparatus for imbalance degree of molar quantity of a current transformer, which includes a memory and a processor, wherein the memory stores an online monitoring and diagnosing program for imbalance degree of molar quantity of a current transformer, which is capable of running on the processor, and the online monitoring and diagnosing program for imbalance degree of molar quantity of a current transformer realizes the above steps of the online monitoring and diagnosing method for imbalance degree of molar quantity of a current transformer when being executed by the processor.
Furthermore, the online monitoring and diagnosing device for the imbalance degree of the molar quantity of the current transformer further comprises a temperature sensor, a pressure sensor and a distance measuring sensor, wherein the temperature sensor, the pressure sensor and the distance measuring sensor are all connected with the processor, and the temperature sensor is used for acquiring a temperature value of a shell of the current transformer; the pressure sensor is used for acquiring a gas pressure value in the current transformer or an oil pressure value at the bottom of the current transformer; the distance measuring sensor is used for measuring the distance from the top of the expander to the distance measuring sensor.
Meanwhile, the present invention provides a storage medium, which is a computer-readable storage medium, and the storage medium stores thereon a current transformer molar quantity imbalance on-line monitoring and diagnosing program, which can be executed by one or more processors, so as to implement the steps of the current transformer molar quantity imbalance on-line monitoring and diagnosing method as described above.
According to the online monitoring and diagnosing method, device and storage medium for the unbalance degree of the molar quantity of the current transformer, provided by the invention, the unbalance degree of the molar quantity of the current transformer is calculated by acquiring the pressure value of gas in the current transformer, the temperature value of a shell and the volume change of an expander, and the state of the current transformer is diagnosed through the unbalance degree of the molar quantity of the current transformer, so that the online uninterrupted monitoring of the oil-gas pressure value in the current transformer for 24 hours is realized, the operation and fault states of the current transformer can be evaluated, the occurrence of accidents is prevented, and a feasible means is provided for the real-time monitoring of the operation and fault states of the equipment.
Drawings
Fig. 1 is a schematic flow chart of a method for online monitoring and diagnosing imbalance of molar quantities of a current transformer according to an embodiment of the present invention;
fig. 2 is a schematic cross-sectional structural diagram of a current transformer according to an embodiment of the present invention;
fig. 3 is a schematic cross-sectional structure diagram of a current transformer according to a second embodiment of the present invention;
fig. 4 is a schematic flow chart of a current transformer molar quantity imbalance on-line monitoring and diagnosing method according to a second embodiment of the present invention;
fig. 5 is a schematic view of an internal structure of an online monitoring and diagnosing apparatus for imbalance of molar quantities of a current transformer according to an embodiment of the present invention;
fig. 6 is a schematic diagram of a module of a current transformer molar quantity imbalance online monitoring and diagnosing program in the current transformer molar quantity imbalance online monitoring and diagnosing apparatus according to an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Example one
Referring to fig. 1, an embodiment of the present invention provides an online monitoring and diagnosing method for imbalance of molar quantities of a current transformer, where the online monitoring and diagnosing method for imbalance of molar quantities of a current transformer includes:
step S11: collecting a gas pressure value and a shell temperature value in a current transformer;
step S12: calculating the unbalance degree of the molar quantity of the current transformer;
step S13: and continuously monitoring the unbalance degree of the molar quantity of the current transformer, and diagnosing the equipment state of the current transformer according to a set diagnosis threshold value.
Specifically, in the first embodiment, the insulating oil of the current transformer is a mineral oil obtained by distilling and refining natural petroleum, and is a mixture of hydrocarbons with different molecular weights, including alkanes, alkenes, cycloalkanes, aromatics, and the like. When discharge or overheating faults exist in the equipment, gases such as H2, CH4, C2H6, C2H4, C2H2, CO and CO2 can be generated, the generated gases are dissolved in oil and released to the oil surface, the gases on the oil surface are gradually accumulated due to the fact that the current transformer is of a sealing structure, the gas pressure is increased to act on liquid insulating oil, oil pressure is gradually increased, and therefore online monitoring of insulation defects in the current transformer can be achieved by obtaining changes of the gas pressure.
The molar amount of gas inside the current transformer is in a steady state equilibrium. At the same time, a certain amount of gas molecules are dissolved into the oil, and simultaneously a certain amount of gas molecules are resolved out of the oil and enter the upper layer of the current transformer. When the state is constant (temperature and pressure are stable), the molar quantity of the gas reaches a stable state, namely steady state equilibrium. As the temperature increases, the solubility of the gas in the oil decreases, resulting in an increase in the number of gas molecules in the current transformer; as the temperature increases, the volume of the insulating oil expands, increasing approximately linearly. Because the load current of the equipment is relatively stable, the load current does not have short-time severe change, the temperature of the atmospheric environment changes slowly, and the change interval is limited, the occurrence of the equipment fault has a longer development period (hidden trouble period), the diagnosis is mainly aimed at making a diagnosis conclusion within the fault development period (hidden trouble period), and the steady state can meet the requirement.
The gas within the current transformer conforms to the equation of state for an ideal gas, which refers to a gas that obeys the laws of an ideal gas. In the case of low pressure and low temperature, air, nitrogen, oxygen, helium, hydrogen, neon and the like all obey the law of ideal gases, and such gases can be regarded as ideal gases. Almost all chemically stable gases behave similarly to ideal gases when conditions are far from liquefaction or solidification.
Ideal gas law: the relationship among the volume V, the absolute pressure P and the absolute temperature T of n thousand moles of gas is PV ═ nRT, wherein R is 8314J/kmol.K, and R is a gas universal constant.
Referring to fig. 2, fig. 2 is a schematic cross-sectional view of a current transformer, specifically, the current transformer 100 includes a rain cover 110 and a body 120, an oil-filled region 121 and a gas region 122 above the oil-filled region 121 are disposed in the body 120, an expander 130 is disposed above the gas region 122, the expander 130 seals the gas in the gas region 122, and when the volume of the gas in the gas region 122 changes, the expander 130 communicates with the gas and changes its volume along with the expansion of the gas volume. Therefore, because the gas expander is arranged at the top of the oil-filled high-voltage current transformer, the expander is scaled along with the air pressure, the buffer effect is realized on the air pressure change, and the homogenization effect is realized on the gas molecule molar density. In actual engineering, due to various complex and unknown conditions, sometimes, various model parameters cannot be accurately determined in advance, and then, a diagnosis result can be quickly obtained by adopting inter-phase comparison and historical data comparison modes.
Therefore, by collecting the gas pressure value and the shell temperature value in the current transformer, the imbalance degree of the number of moles of gas molecules in the current transformer is calculated, specifically, the imbalance degree algorithm of the number of moles of gas between phases adopts an imbalance degree minimum difference algorithm:
the calculation formula of the imbalance degree of the molar quantity of the current transformer is as follows:
when the sensor is arranged at the top of the current transformer, the unbalance degree of the molar quantity of the current transformer is as follows:
then:
it can be assumed that: the phase A is the maximum value of the gas molar quantity, the phase B is the minimum value of the gas molar quantity, and then:
Ma(t)＝Mmax(t)，Pa(t)＝Pmax(t)
Mb(t)＝Mmin(t)，Pb(t)＝Pmin(t)
wherein, Tga(t)≈Tgb(t)
Then:
when the sensor is arranged at the bottom of the current transformer, the molar quantity imbalance of the current transformer is as follows:
wherein the content of the first and second substances,
Pomax(t)＝max(Poa(t)，Pob(t)，Poc(t))；
Pomin(t)＝min(Poa(t)，Pob(t)，Poc(t))；
Pmax(t)＝max(Pa(t)，Pb(t)，Pc(t))；
Pmin(t)＝min(Pa(t)，Pb(t)，Pc(t))；
ε1(t) the unbalance degree of the molar quantity of the current transformer;
pa (t) is the pressure of oil liquid at the top of the phase A of the current transformer at the moment t;
pb (t) is the pressure of oil liquid at the top of the phase B of the current transformer at the moment t;
pc (t) is the pressure of oil liquid at the top of the C phase of the current transformer at the time t;
Poa (t) is the oil pressure at the bottom of the phase A of the current transformer at the moment t;
Pob (t) is the oil pressure at the bottom of the phase B of the current transformer at the moment t;
Poc (t) is the oil pressure at the bottom of the phase C of the current transformer at the moment t; poh(t) the equivalent pressure of the height of the oil in the current transformer at the moment t;
k is the expander volume expansion coefficient.
And continuously monitoring the unbalance degree of the molar quantity of the current transformer, and diagnosing the equipment state of the current transformer according to a set diagnosis threshold value. Specifically, the diagnostic threshold is:
when epsilon1(t) sending an alarm signal when the t is more than or equal to 35 percent;
when the content is 35 percent>ε1(t) when the content is more than or equal to 25%, sending an early warning signal;
when the content is 25 percent>ε1(t) ≧ 15%, a signal of interest is transmitted. Example two
Referring to fig. 3, fig. 3 is a schematic cross-sectional view of a current transformer according to a second embodiment of the present invention, which is compared with the first embodiment of the present invention, in that a distance measuring sensor is added to the current transformer 100, specifically, the current transformer 100 includes a rain-proof cover 110 and a body 120, an oil-filled region 121 and a gas region 122 above the oil-filled region 121 are disposed in the body 120, an expander 130 is disposed above the gas region 122, the expander 130 seals the gas in the gas region 122, and when the volume of the gas in the gas region 122 changes, the expander 130 communicates with the gas and changes its volume along with the expansion of the volume of the gas; a distance measuring sensor 140 is arranged on the top of the rain shield 110 above the expander 130, and the distance measuring sensor 140 is used for measuring the distance between the expander top 131 and the distance measuring sensor 140. In the figure, Ht is the distance from the bottom of the expander to the distance measuring sensor and is a constant; hc is the distance from the top of the expander to the distance measuring sensor and is a measurable variable; hp is the expander height, which is a calculable variable.
When a distance measuring sensor is mounted on the gas expander, the change in the displacement of the height of the gas expander can be monitored. Therefore, the change of the volume of the gas in the current transformer can be calculated.
Referring to fig. 4, a second embodiment of the present invention provides an online monitoring and diagnosing method for imbalance of molar quantities of a current transformer, including:
step S21: collecting a gas pressure value and a shell temperature value in the current transformer and the distance from the top of the expander to the distance measuring sensor;
step S22: calculating the expander volume;
step S23: calculating the unbalance degree of the molar quantity of the current transformer;
step S24: and continuously monitoring the unbalance degree of the molar quantity of the current transformer, and diagnosing the equipment state of the current transformer according to a set diagnosis threshold value.
Therefore, in the second embodiment, the gas pressure value and the shell temperature value in the current transformer and the distance from the top of the expander to the distance measuring sensor are collected; further, the expander volume is calculated according to the distance measuring sensor and the height of the expander, and the calculation formula of the expander volume is as follows:
V(t)＝SpHp(t)+V1，Hp(t)＝Ht-Hc(t)
wherein the content of the first and second substances,
v (t) is the expander volume at time t;
Sp、V1、Htis a constant coefficient;
Hp(t) expander height at time t;
Hc(t) is the distance from the top of the expander to the ranging sensor at time t;
in particular, the constant coefficient Sp、V1、HtThe values of (A) are shown in Table 1:
TABLE 1
Further, the calculation formula of the imbalance degree of the molar quantity of the current transformers is as follows:
when the sensor is on top of the current transformer,
when the sensor is at the bottom of the current transformer,
similarly, ε can be calculated separatelybc(t)，εac(t)；
Then, the imbalance degree of the molar quantity of the current transformer is as follows:
ε1(t)＝max(|εab(t)|，|εbc(t)|，|εac(t)|)
wherein the content of the first and second substances,
ε1(t) the unbalance degree of the molar quantity of the current transformer;
pa (t) is the pressure of oil liquid at the top of the phase A of the current transformer at the moment t;
pb (t) is the pressure of oil liquid at the top of the phase B of the current transformer at the moment t;
pc (t) is the pressure of oil liquid at the top of the C phase of the current transformer at the time t;
Poa (t) is the oil pressure at the bottom of the phase A of the current transformer at the moment t;
Pob (t) is the oil pressure at the bottom of the phase B of the current transformer at the moment t;
Poc (t) is the oil pressure at the bottom of the phase C of the current transformer at the moment t;
Pohand (t) is the equivalent pressure of the oil height in the current transformer at the moment t.
Continuously monitoring the imbalance degree of the molar quantity of the current transformer, and diagnosing the equipment state of the current transformer according to a set diagnosis threshold, wherein the step is the same as the first step in the embodiment, and is not repeated herein.
In addition, the invention also provides an online monitoring and diagnosing device for the imbalance degree of the molar quantity of the current transformer.
Referring to fig. 5, an internal structure diagram of an online current transformer molar quantity imbalance monitoring and diagnosing apparatus according to an embodiment of the present invention is provided, where the online current transformer molar quantity imbalance monitoring and diagnosing apparatus at least includes a memory 11, a processor 12, a communication bus 13, a network interface 14, a temperature sensor 15, a pressure sensor 16, and a distance measuring sensor 17.
The memory 11 includes at least one type of readable storage medium, which includes a flash memory, a hard disk, a multimedia card, a card type memory (e.g., SD or DX memory, etc.), a magnetic memory, a magnetic disk, an optical disk, and the like. The memory 11 may be an internal storage unit of the online current transformer molar quantity imbalance monitoring and diagnosing apparatus in some embodiments, for example, a hard disk of the online current transformer molar quantity imbalance monitoring and diagnosing apparatus. The memory 11 may also be an external storage device of the online monitoring and diagnosing apparatus for imbalance of molar number of current transformers in other embodiments, for example, a plug-in hard disk, a Smart Media Card (SMC), a Secure Digital (SD) Card, a Flash memory Card (Flash Card), or the like, which is equipped on the online monitoring and diagnosing apparatus for imbalance of molar number of current transformers. Further, the memory 11 may include both an internal memory unit and an external memory device of the online current transformer molar quantity imbalance monitoring and diagnosing apparatus. The memory 11 may be used to store not only application software installed in the online current transformer molar imbalance degree monitoring and diagnosing apparatus and various types of data, such as codes of an online current transformer molar imbalance degree monitoring and diagnosing program, but also temporarily store data that has been output or is to be output.
The processor 12 may be a Central Processing Unit (CPU), a controller, a microcontroller, a microprocessor or other data Processing chip in some embodiments, and is configured to execute program codes or Processing data stored in the memory 11, for example, execute a current transformer molar imbalance on-line monitoring and diagnosing program.
The communication bus 13 is used to realize connection communication between these components.
The network interface 14 may optionally include a standard wired interface, a wireless interface (such as a WI-FI interface), and is generally used for establishing a communication connection between the online current transformer molar quantity imbalance monitoring and diagnosing apparatus and other electronic devices.
The temperature sensor 15, the pressure sensor 16 and the distance measuring sensor are connected with the processor 12, and the temperature sensor 15 is used for acquiring a temperature value in the current transformer; the pressure sensor 16 is used for acquiring a gas pressure value in the current transformer or an oil pressure value at the bottom of the current transformer; the distance measuring sensor 17 is used to measure the distance from the top of the expander to the distance measuring sensor 17.
Optionally, the online current transformer molar quantity imbalance monitoring and diagnosing apparatus may further include a user interface, where the user interface may include a Display (Display), an input unit such as a Keyboard (Keyboard), and the optional user interface may further include a standard wired interface and a wireless interface. Alternatively, in some embodiments, the display may be an LED display, a liquid crystal display, a touch-sensitive liquid crystal display, an OLED (Organic Light-Emitting Diode) touch device, or the like. The display may also be referred to as a display screen or a display unit, and is used for displaying information processed in the online current transformer molar quantity imbalance monitoring and diagnosing apparatus and displaying a visual user interface.
Fig. 5 shows only the current transformer molar quantity imbalance on-line monitoring and diagnosing apparatus having the components 11 to 17 and the current transformer molar quantity imbalance on-line monitoring and diagnosing program, and it will be understood by those skilled in the art that the structure shown in fig. 5 does not constitute a limitation of the current transformer molar quantity imbalance on-line monitoring and diagnosing apparatus, and may include fewer or more components than those shown, or some components in combination, or a different arrangement of components.
In the embodiment of the online monitoring and diagnosing device for imbalance degree of molar number of current transformers shown in fig. 5, an online monitoring and diagnosing program for imbalance degree of molar number of current transformers is stored in the memory 11; when the processor 12 executes the online monitoring and diagnosing program for the imbalance degree of the molar quantities of the current transformers stored in the memory 11, the following steps are realized:
step S11: collecting a gas pressure value and a shell temperature value in a current transformer;
step S12: calculating the unbalance degree of the molar quantity of the current transformer;
step S13: and continuously monitoring the unbalance degree of the molar quantity of the current transformer, and diagnosing the equipment state of the current transformer according to a set diagnosis threshold value.
Or:
step S21: collecting a gas pressure value and a shell temperature value in the current transformer and the distance from the top of the expander to the distance measuring sensor;
step S22: calculating the expander volume;
step S23: calculating the unbalance degree of the molar quantity of the current transformer;
step S24: and continuously monitoring the unbalance degree of the molar quantity of the current transformer, and diagnosing the equipment state of the current transformer according to a set diagnosis threshold value.
Referring to fig. 6, a schematic diagram of program modules of an online current transformer molar quantity imbalance monitoring and diagnosing program in an embodiment of the online current transformer molar quantity imbalance monitoring and diagnosing apparatus according to the present invention is shown, in which the online current transformer molar quantity imbalance monitoring and diagnosing program in this embodiment may be divided into an acquisition module 10, a calculation module 20, a setting module 30, and a diagnosis module 40, which exemplarily:
the acquisition module 10 is used for acquiring a gas pressure value and a shell temperature value in the current transformer and the distance from the top of the expander to the distance measuring sensor;
a calculation module 20 for calculating the number of moles of gas molecules;
a setting module 30 for setting a diagnostic threshold;
and the diagnosis module 40 is used for monitoring and diagnosing the gas pressure and temperature of the current transformer on line.
The functions or operation steps of the acquisition module 10, the calculation module 20, the setting module 30, the diagnosis module 40 and other program modules implemented when executed are substantially the same as those of the above embodiments, and are not repeated herein.
In addition, an embodiment of the present invention further provides a storage medium, where the storage medium is a computer-readable storage medium, and the storage medium stores thereon an online current transformer molar quantity imbalance monitoring and diagnosing program, where the online current transformer molar quantity imbalance monitoring and diagnosing program is executable by one or more processors to implement the following operations:
step S11: collecting a gas pressure value and a shell temperature value in a current transformer;
step S12: calculating the unbalance degree of the molar quantity of the current transformer;
step S13: and continuously monitoring the unbalance degree of the molar quantity of the current transformer, and diagnosing the equipment state of the current transformer according to a set diagnosis threshold value.
Or:
step S21: collecting a gas pressure value and a shell temperature value in the current transformer and the distance from the top of the expander to the distance measuring sensor;
step S22: calculating the expander volume;
step S23: calculating the unbalance degree of the molar quantity of the current transformer;
step S24: and continuously monitoring the unbalance degree of the molar quantity of the current transformer, and diagnosing the equipment state of the current transformer according to a set diagnosis threshold value.
The specific implementation of the storage medium of the present invention is substantially the same as the embodiments of the above-mentioned method and apparatus for online monitoring and diagnosing the imbalance degree of molar quantities of a current transformer, and will not be described herein in a repeated manner.
Compared with the prior art, the online monitoring and diagnosing method, the online monitoring and diagnosing device and the storage medium for the imbalance degree of the molar quantity of the current transformer provided by the invention have the advantages that the molar quantity of the gas molecules of the current transformer is calculated by acquiring the pressure value and the temperature value of the shell in the current transformer and the volume change of the expander, and the state of the current transformer equipment is diagnosed by the molar quantity of the gas molecules of the current transformer, so that the online uninterrupted monitoring of the pressure value of oil gas in the current transformer for 24 hours is realized, the operation and fault states of the current transformer equipment can be evaluated, the occurrence of accidents is prevented, and a feasible means is provided for the real-time monitoring of the operation and fault states of the.
It should be noted that the above-mentioned numbers of the embodiments of the present invention are merely for description, and do not represent the merits of the embodiments. And the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, apparatus, article, or method that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, apparatus, article, or method. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other like elements in a process, apparatus, article, or method that comprises the element.
Through the above description of the embodiments, those skilled in the art will clearly understand that the method of the above embodiments can be implemented by software plus a necessary general hardware platform, and certainly can also be implemented by hardware, but in many cases, the former is a better implementation manner. Based on such understanding, the technical solution of the present invention may be embodied in the form of a software product, which is stored in a storage medium (e.g., ROM/RAM, magnetic disk, optical disk) as described above, and includes instructions for enabling a terminal device (e.g., a drone, a mobile phone, a computer, a server, or a network device) to execute the method according to the embodiments of the present invention.
It is to be noted that the foregoing is only illustrative of the preferred embodiments of the present invention and the technical principles employed. It will be understood by those skilled in the art that the present invention is not limited to the particular embodiments described herein, but is capable of various obvious changes, rearrangements and substitutions as will now become apparent to those skilled in the art without departing from the scope of the invention. Therefore, although the present invention has been described in greater detail by the above embodiments, the present invention is not limited to the above embodiments, and may include other equivalent embodiments without departing from the spirit of the present invention, and the scope of the present invention is determined by the scope of the appended claims.
Claims (9)
1. The online monitoring and diagnosing method for the imbalance degree of the molar quantity of the current transformer is characterized by comprising the following steps of:
collecting a gas pressure value and a shell temperature value in a current transformer;
calculating the unbalance degree of the molar quantity of the current transformer;
and continuously monitoring the unbalance degree of the molar quantity of the current transformer, and diagnosing the equipment state of the current transformer according to a set diagnosis threshold value.
2. The online monitoring and diagnosing method for the imbalance degree of the molar quantity of the current transformer according to claim 1, wherein the calculation formula of the imbalance degree of the molar quantity of the current transformer is as follows:
when the sensor is arranged at the top of the current transformer, the unbalance degree of the molar quantity of the current transformer is as follows:
when the sensor is arranged at the bottom of the current transformer, the unbalance degree of the molar quantity of the current transformer is as follows:
wherein the content of the first and second substances,
Pomax(t)＝max(Poa(t)，Pob(t)，Poc(t))；
Pomin(t)＝min(Poa(t)，Pob(t)，Poc(t))；
Pmax(t)＝max(Pa(t)，Pb(t)，Pc(t))；
Pmin(t)＝min(Pa(t)，Pb(t)，Pc(t))；
ε1(t) the unbalance degree of the molar quantity of the current transformer;
pa (t) is the pressure of oil liquid at the top of the phase A of the current transformer at the moment t;
pb (t) is the pressure of oil liquid at the top of the phase B of the current transformer at the moment t;
pc (t) is the pressure of oil liquid at the top of the C phase of the current transformer at the time t;
Poa (t) is the oil pressure at the bottom of the phase A of the current transformer at the moment t;
Pob (t) is the oil pressure at the bottom of the phase B of the current transformer at the moment t;
Poc (t) is the oil pressure at the bottom of the phase C of the current transformer at the moment t;
Pohand (t) is the equivalent pressure of the oil height in the current transformer at the moment t.
3. The online current transformer molar quantity imbalance monitoring and diagnosing method as claimed in claim 1, wherein the diagnosis threshold is:
when epsilon1(t) sending an alarm signal when the t is more than or equal to 35 percent;
when 35% is more than epsilon1(t) when the content is more than or equal to 25%, sending an early warning signal;
when 25% > epsilon1(t) ≧ 15%, a signal of interest is transmitted.
4. The online monitoring and diagnosing method for the imbalance degree of the molar quantity of the current transformer is characterized by comprising the following steps of:
collecting a gas pressure value and a shell temperature value in the current transformer and the distance from the top of the expander to the distance measuring sensor;
calculating the expander volume;
calculating the unbalance degree of the molar quantity of the current transformer;
and continuously monitoring the unbalance degree of the molar quantity of the current transformer, and diagnosing the equipment state of the current transformer according to a set diagnosis threshold value.
5. The on-line monitoring and diagnosing method for imbalance degree of molar quantity of current transformer as claimed in claim 4, wherein the volume of the expander is calculated by the formula:
V(t)＝SpHp(t)+V1，Hp(t)＝Ht(t)-Hc(t)
wherein the content of the first and second substances,
v (t) is the expander volume at time t;
Sp、V1、Htis a constant coefficient;
Hp(t) expander height at time t;
Hc(t) is the distance from the top of the expander to the ranging sensor at time t.
6. The online monitoring and diagnosing method for the imbalance degree of the molar quantity of the current transformer as recited in claim 4, wherein the calculation formula of the imbalance degree of the molar quantity of the current transformer is as follows:
when the sensor is on top of the current transformer,
when the sensor is at the bottom of the current transformer,
similarly, ε can be calculated separatelybc(t)，εac(t)；
Then, the imbalance degree of the molar quantity of the current transformer is as follows:
ε1(t)＝max(|εab(t)|，|εbc(t)|，|εac(t)|)
wherein the content of the first and second substances,
ε1(t) is a currentUnbalance degree of molar quantity of the mutual inductor;
pa (t) is the pressure of oil liquid at the top of the phase A of the current transformer at the moment t;
pb (t) is the pressure of oil liquid at the top of the phase B of the current transformer at the moment t;
pc (t) is the pressure of oil liquid at the top of the C phase of the current transformer at the time t;
Poa (t) is the oil pressure at the bottom of the phase A of the current transformer at the moment t;
Pob (t) is the oil pressure at the bottom of the phase B of the current transformer at the moment t;
Poc (t) is the oil pressure at the bottom of the phase C of the current transformer at the moment t;
Pohand (t) is the equivalent pressure of the oil height in the current transformer at the moment t.
7. An on-line monitoring and diagnosing apparatus for imbalance of molar quantity of current transformers, comprising a memory and a processor, wherein the memory stores thereon an on-line monitoring and diagnosing program for imbalance of molar quantity of current transformers, which can be executed on the processor, and when the processor executes the program, the method for on-line monitoring and diagnosing imbalance of molar quantity of current transformers according to any one of claims 1 to 6 is implemented.
8. The on-line monitoring and diagnosing device for the imbalance degree of the molar quantity of the current transformer as recited in claim 7, further comprising a temperature sensor, a pressure sensor and a distance measuring sensor, wherein the temperature sensor, the pressure sensor and the distance measuring sensor are all connected with the processor, and the temperature sensor is used for acquiring a temperature value of a shell of the current transformer; the pressure sensor is used for acquiring a gas pressure value in the current transformer or an oil pressure value at the bottom of the current transformer; the distance measuring sensor is used for measuring the distance from the top of the expander to the distance measuring sensor.
9. A storage medium, which is a computer-readable storage medium, and on which a current transformer molar quantity imbalance online monitoring and diagnosing program is stored, where the current transformer molar quantity imbalance online monitoring and diagnosing program is executable by one or more processors to implement the steps of the current transformer molar quantity imbalance online monitoring and diagnosing method according to any one of claims 1 to 6.
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