CN112557989A - Online monitoring and diagnosing method for number of mols of gas molecules of current transformer - Google Patents
Online monitoring and diagnosing method for number of mols of gas molecules of current transformer Download PDFInfo
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- G—PHYSICS
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- G01R35/00—Testing or calibrating of apparatus covered by the other groups of this subclass
- G01R35/02—Testing or calibrating of apparatus covered by the other groups of this subclass of auxiliary devices, e.g. of instrument transformers according to prescribed transformation ratio, phase angle, or wattage rating
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Abstract
The invention provides a method, a device and a storage medium for online monitoring and diagnosing the number of moles of gas molecules 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 expander volume; calculating the mole number value of gas molecules in the current transformer; and continuously monitoring the gas molecule mole number value, 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 oil gas pressure value in the current transformer can be continuously monitored for 24 hours 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 a current transformer, in particular to a method, a device and a storage medium for on-line monitoring and diagnosis of the number of moles of gas molecules of the current transformer.
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 number of moles of gas molecules of a current transformer, and aims to solve the problems of gas pressure and temperature monitoring and fault diagnosis of the existing current transformer.
In order to achieve the above object, the present invention provides an online monitoring and diagnosing method for the number of moles of gas molecules of a current transformer, which comprises:
collecting a gas pressure value and a shell temperature value in a current transformer;
calculating the expander volume;
calculating the mole number value of gas molecules in the current transformer;
and continuously monitoring the gas molecule mole number value, and diagnosing the equipment state of the current transformer according to a set diagnosis threshold value.
Further, the calculated expander volume is calculated using an expander elastic deformation equation:
V(t)＝kP(t)+V0
wherein the content of the first and second substances,
v (t) is the expander volume at time t;
k is the volume expansion coefficient of the expander;
p (t) is the gas pressure in the current transformer at the time t;
V0is a constant coefficient.
Further, the calculation formula of the gas molecule mole number value is as follows:
when the sensor is positioned at the top of the current transformer, the number of moles of gas molecules in the current transformer is as follows:
when the sensor is positioned at the bottom of the current transformer, the number of moles of gas molecules in the current transformer is as follows:
wherein:
Pg(t) the gas pressure in the current transformer at time t;
Po(t) the pressure intensity of the oil at the bottom 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;
Tg(t) the temperature of the current transformer shell at the moment t;
To(t) is the bottom temperature of the current transformer at time t;
m (t) is the value of the number of moles of gas molecules in the current transformer at the time t.
Further, the diagnostic threshold is:
when M (t) is more than or equal to 10or M (t) is less than or equal to 2.5, sending an alarm signal;
when 10 is more than M (t) is more than 8.5or 3 is more than M (t) is more than 2.5, an early warning signal is sent.
The invention also provides an online monitoring and diagnosing method for the number of moles of gas molecules 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 mole number value of gas molecules in the current transformer;
and continuously monitoring the gas molecule mole number value, 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)＝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.
Further, the calculation formula of the gas molecule mole number value is as follows:
when the sensor is positioned at the top of the current transformer, the number of moles of gas molecules in the current transformer is as follows:
when the sensor is positioned at the bottom of the current transformer, the number of moles of gas molecules in the current transformer is as follows:
wherein:
Pg(t) the gas pressure in the current transformer at time t;
Po(t) the pressure intensity of the oil at the bottom 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;
Tg(t) the temperature of the current transformer shell at the moment t;
To(t) is the bottom temperature of the current transformer at time t;
v (t) is the expander volume at time t;
m (t) is the value of the number of moles of gas molecules in the current transformer at the time t.
In addition, the present invention provides an online monitoring and diagnosing apparatus for the number of moles of gas molecules of a current transformer, which includes a memory and a processor, wherein the memory stores an online monitoring and diagnosing program for the number of moles of gas molecules of a current transformer, which is executable on the processor, and the online monitoring and diagnosing program for the number of moles of gas molecules of a current transformer, when executed by the processor, implements the steps of the online monitoring and diagnosing method for the number of moles of gas molecules of a current transformer as described above.
Furthermore, the online monitoring and diagnosing device for the number of moles of gas molecules 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 shell temperature value 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 a current transformer gas molecule mole number online monitoring and diagnosing program, which can be executed by one or more processors to implement the steps of the current transformer gas molecule mole number online monitoring and diagnosing method as described above.
According to the online monitoring and diagnosing method, device and storage medium for the number of moles of gas molecules of the current transformer, provided by the invention, the number of moles of gas molecules of the current transformer is calculated by acquiring the pressure value and the temperature value of a shell in the current transformer and the volume change of the expander, and the state of the current transformer is diagnosed by the number of moles of gas molecules of the current transformer, so that the online uninterrupted monitoring of the value of the oil gas pressure 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 molar quantity of gas molecules 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 graph showing the shift of the measured molar quantity of the gas in the current transformer according to the first embodiment of the present invention;
fig. 4 is a schematic cross-sectional structure diagram of a current transformer according to a second embodiment of the present invention;
fig. 5 is a schematic flow chart of a method for online monitoring and diagnosing the number of moles of gas molecules in a current transformer according to a second embodiment of the present invention;
fig. 6 is a schematic view of an internal structure of a device for online monitoring and diagnosing the number of moles of gas molecules in a current transformer according to an embodiment of the present invention;
fig. 7 is a schematic diagram of a module of a current transformer gas molecule number online monitoring and diagnosing program in the current transformer gas molecule number 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 a molar quantity of a gas molecule of a current transformer, where the online monitoring and diagnosing method for a molar quantity of a gas molecule 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 expander volume;
step S13: calculating the mole number value of gas molecules in the current transformer;
step S14: and continuously monitoring the gas molecule mole number value, 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 cross-sectional view of a current transformer, specifically, the current transformer 100 includes a housing 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. The number of moles of gas in the current transformer is the most direct physical quantity with the internal fault state, and the current transformer has diagnostic index significance.
Therefore, the gas molecule mole number value in the current transformer is calculated by collecting the gas pressure value and the shell temperature value in the current transformer, and the gas molecule mole number value in the current transformer is further calculated by calculating the volume of the expander.
When the expander is in normal operation Vmin≤V(t)≤VmaxCorresponding gas pressure range (P)min，Pmax) The expander is in an elastically deformed state, and the calculated expander volume is calculated using an expander elastic deformation equation:
V(t)＝kP(t)+V0
wherein the content of the first and second substances,
v (t) is the expander volume at time t;
k is the volume expansion coefficient of the expander;
p (t) is the gas pressure in the current transformer at the time t;
V0is a constant coefficient.
Volume expansion coefficient k and constant coefficient V of expander0In relation to the expander used for the type of plant, as shown in table 1:
TABLE 1
| Type of device | k(dm3/kPa) | V0(dm3) |
| Expander of 110kV current transformer | 0.16 | -1 |
| Expander of 220kV current transformer | 0.16 | 0 |
Wherein dm is decimeter.
Further calculating the mole number value of the gas molecules in the current transformer, wherein the calculation formula of the mole number value of the gas molecules is as follows:
when the sensor is positioned at the top of the current transformer, the number of moles of gas molecules in the current transformer is as follows:
when the sensor is positioned at the bottom of the current transformer, the number of moles of gas molecules in the current transformer is as follows:
wherein:
Pg(t) the gas pressure in the current transformer at time t;
Po(t) the pressure intensity of the oil at the bottom 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;
Tg(t) the temperature of the current transformer shell at the moment t;
To(t) is the bottom temperature of the current transformer at time t;
m (t) is the value of the number of moles of gas molecules in the current transformer at the time t.
And continuously monitoring the gas molecule mole number value, and diagnosing the equipment state of the current transformer according to a set diagnosis threshold value. The diagnostic threshold is:
when M (t) is more than or equal to 10or M (t) is less than or equal to 2.5, sending an alarm signal;
when 10 is more than M (t) is more than 8.5or 3 is more than M (t) is more than 2.5, an early warning signal is sent.
Referring to fig. 3, a graph of a transition of the molar quantities of the gases of the current transformer measured in the first embodiment of the present invention is obtained according to the variation trend of the molar quantities of the gases of the phase a, the phase B, and the phase C: all data varied within tolerances; the three-phase data change trends are almost completely consistent. Therefore, the apparatus is normal.
Example two
Referring to fig. 4, fig. 4 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 housing 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 disposed on the top of the housing 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. 5, a second embodiment of the present invention provides an online monitoring and diagnosing method for molar quantity of gas molecules 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 mole number value of gas molecules in the current transformer;
step S24: and continuously monitoring the gas molecule mole number value, 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 2:
TABLE 2
Further, the calculation formula of the gas molecule mole number value is as follows:
when the sensor is positioned at the top of the current transformer, the number of moles of gas molecules in the current transformer is as follows:
when the sensor is positioned at the bottom of the current transformer, the number of moles of gas molecules in the current transformer is as follows:
wherein:
Pg(t) the gas pressure in the current transformer at time t;
Po(t) the pressure intensity of the oil at the bottom 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;
Tg(t) the temperature of the current transformer shell at the moment t;
To(t) is the bottom temperature of the current transformer at time t;
v (t) is the expander volume at time t;
m (t) is the value of the number of moles of gas molecules in the current transformer at the time t.
And continuously monitoring the gas molecule mole number value, and diagnosing the equipment state of the current transformer according to a set diagnosis threshold, wherein the step is the same as the step in the first embodiment, and is not repeated herein.
In addition, the invention also provides an on-line monitoring and diagnosing device for the number of moles of gas molecules of the current transformer.
Referring to fig. 6, an internal structure diagram of a current transformer gas molecule mole number online monitoring and diagnosing apparatus according to an embodiment of the present invention is provided, where the current transformer gas molecule mole number online 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 current transformer gas molecule mole number online monitoring and diagnosing apparatus in some embodiments, for example, a hard disk of the current transformer gas molecule mole number online monitoring and diagnosing apparatus. The memory 11 may also be an external storage device of the on-line monitoring and diagnosing apparatus for molar quantity of gas molecules of the current transformer 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 provided on the on-line monitoring and diagnosing apparatus for molar quantity of gas molecules of the current transformer. Further, the memory 11 may also include both an internal storage unit and an external storage device of the online monitoring and diagnosing apparatus for the number of moles of gas molecules of the current transformer. The memory 11 may be used to store not only application software installed in the current transformer gas molecule mole number online monitoring and diagnosing apparatus and various types of data, such as codes of a current transformer gas molecule mole number online 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 used for executing program codes stored in the memory 11 or Processing data, such as executing a current transformer gas molecule 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 monitoring and diagnosing apparatus for the number of moles of gas molecules of the current transformer 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 monitoring and diagnosing apparatus for the number of moles of gas molecules in the current transformer may further include a user interface, 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, where appropriate, and is used for displaying information processed in the current transformer gas molar quantity online monitoring and diagnosis device and displaying a visual user interface.
Fig. 6 shows only the current transformer gas molecular mole number online monitoring and diagnosing apparatus having the components 11 to 17 and the current transformer gas molecular mole number online monitoring and diagnosing program, and it will be understood by those skilled in the art that the structure shown in fig. 6 does not constitute a limitation to the current transformer gas molecular mole number online 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 on-line monitoring and diagnosing apparatus for the number of moles of gas molecules of a current transformer shown in fig. 6, an on-line monitoring and diagnosing program for the number of moles of gas molecules of the current transformer is stored in the memory 11; the processor 12 implements the following steps when executing the online monitoring and diagnosing program of the number of moles of gas molecules of the current transformer stored in the memory 11:
step S11: collecting a gas pressure value and a shell temperature value in a current transformer;
step S12: calculating the expander volume;
step S13: calculating the mole number value of gas molecules in the current transformer;
step S14: and continuously monitoring the gas molecule mole number value, 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 mole number value of gas molecules in the current transformer;
step S24: and continuously monitoring the gas molecule mole number value, and diagnosing the equipment state of the current transformer according to a set diagnosis threshold value.
Referring to fig. 7, a schematic diagram of a program module of an online monitoring and diagnosing program for the number of moles of gas molecules of the current transformer in an embodiment of the online monitoring and diagnosing apparatus for the number of moles of gas molecules of the current transformer according to the present invention is shown, in this embodiment, the online monitoring and diagnosing program for the number of moles of gas molecules of the current transformer may be divided into an acquisition module 10, a calculation module 20, a setting module 30, and a diagnosing 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 a current transformer gas molar quantity online monitoring and diagnosing program, where the current transformer gas molar quantity online 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 expander volume;
step S13: calculating the mole number value of gas molecules in the current transformer;
step S14: and continuously monitoring the gas molecule mole number value, 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 mole number value of gas molecules in the current transformer;
step S24: and continuously monitoring the gas molecule mole number value, and diagnosing the equipment state of the current transformer according to a set diagnosis threshold value.
The embodiment of the storage medium of the invention is basically the same as the embodiments of the method and the device for online monitoring and diagnosing the number of moles of gas molecules of the current transformer, and will not be described in detail herein.
Compared with the prior art, the online monitoring and diagnosing method, the online monitoring and diagnosing device and the storage medium for the number of the gas molecules of the current transformer provided by the invention have the advantages that the number of the gas molecules of the current transformer is calculated by acquiring the gas pressure value and the shell temperature value in the current transformer and the volume change of the expander, the state diagnosis of the current transformer equipment is carried out through the number of the gas molecules of the current transformer, 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 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 equipment.
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 (10)
1. A method for online monitoring and diagnosing the number of moles of gas molecules of a current transformer is characterized by comprising the following steps:
collecting a gas pressure value and a shell temperature value in a current transformer;
calculating the expander volume;
calculating the mole number value of gas molecules in the current transformer;
and continuously monitoring the gas molecule mole number value, 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 number of moles of gas molecules of the current transformer as recited in claim 1, wherein the calculating the expander volume is calculated using an expander elastic deformation equation:
V(t)＝kP(t)+V0
wherein the content of the first and second substances,
v (t) is the expander volume at time t;
k is the volume expansion coefficient of the expander;
p (t) is the gas pressure in the current transformer at the time t;
V0is a constant coefficient.
3. The online monitoring and diagnosing method for the number of moles of gas molecules of the current transformer as claimed in claim 1, wherein the calculation formula of the value of the number of moles of gas molecules is as follows:
when the sensor is positioned at the top of the current transformer, the number of moles of gas molecules in the current transformer is as follows:
when the sensor is positioned at the bottom of the current transformer, the number of moles of gas molecules in the current transformer is as follows:
wherein:
Pg(t) the gas pressure in the current transformer at time t;
Po(t) the pressure intensity of the oil at the bottom 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;
Tg(t) the temperature of the current transformer shell at the moment t;
To(t) is the bottom temperature of the current transformer at time t;
m (t) is the value of the number of moles of gas molecules in the current transformer at the time t.
4. The online monitoring and diagnosing method for the number of moles of gas molecules of the current transformer according to claim 1, wherein the diagnosing threshold is:
when M (t) is more than or equal to 10or M (t) is less than or equal to 2.5, sending an alarm signal;
when 10 is more than M (t) is more than or equal to 8.5or 3 is more than or equal to M (t) is more than 2.5, an early warning signal is sent.
5. A method for online monitoring and diagnosing the number of moles of gas molecules of a current transformer is characterized by comprising 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 mole number value of gas molecules in the current transformer;
and continuously monitoring the gas molecule mole number value, and diagnosing the equipment state of the current transformer according to a set diagnosis threshold value.
6. The method for on-line monitoring and diagnosing the number of molecules of the gas of the current transformer according to claim 5, wherein the volume of the expander is calculated by the formula:
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.
7. The online monitoring and diagnosing method for the number of moles of gas molecules of the current transformer as claimed in claim 5, wherein the calculation formula of the number of moles of gas molecules is as follows:
when the sensor is positioned at the top of the current transformer, the number of moles of gas molecules in the current transformer is as follows:
when the sensor is positioned at the bottom of the current transformer, the number of moles of gas molecules in the current transformer is as follows:
wherein:
Pg(t) the gas pressure in the current transformer at time t;
Po(t) the pressure intensity of the oil at the bottom 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;
Tg(t) the temperature of the current transformer shell at the moment t;
To(t) is the bottom temperature of the current transformer at time t;
v (t) is the expander volume at time t;
m (t) is the value of the number of moles of gas molecules in the current transformer at the time t.
8. An on-line monitoring and diagnosing device for the number of moles of gas molecules of a current transformer, which is characterized by comprising a memory and a processor, wherein the memory stores an on-line monitoring and diagnosing program for the number of moles of gas molecules of the current transformer, which can be run on the processor, and the on-line monitoring and diagnosing program for the number of moles of gas molecules of the current transformer, when executed by the processor, realizes the steps of the on-line monitoring and diagnosing method for the number of moles of gas molecules of the current transformer according to any one of claims 1 to 7.
9. The on-line monitoring and diagnosing device for the number of moles of gas molecules of the current transformer as recited in claim 8, wherein the on-line monitoring and diagnosing device for the number of moles of gas molecules of the current transformer further comprises a temperature sensor, a pressure sensor and a distance measuring sensor, 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.
10. A storage medium, which is a computer-readable storage medium, wherein the storage medium stores thereon a current transformer gas molar quantity online monitoring and diagnosing program, which is executable by one or more processors to implement the steps of the current transformer gas molar quantity online monitoring and diagnosing method according to any one of claims 1 to 7.
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112557991A (en) * | 2020-11-12 | 2021-03-26 | 珠海一多监测科技有限公司 | Current transformer fault diagnosis method based on mole number and temperature |
Citations (16)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN85203074U (en) * | 1985-07-22 | 1986-06-11 | 韩顺庆 | Transformer expand protector with wave shaped lobes |
| US20070027640A1 (en) * | 2005-07-28 | 2007-02-01 | Avistar, Inc. | Method and apparatus for monitoring SF6 gas and electric utility apparatus |
| JP2008064453A (en) * | 2007-10-22 | 2008-03-21 | Mitsubishi Electric Corp | Coolant leakage detecting method and refrigerating cycle device |
| US20110156918A1 (en) * | 2009-12-30 | 2011-06-30 | Eduardo Pedrosa Santos | System for monitoring oil level and detecting leaks in power transformers, reactors, current and potential transformers, high voltage bushings and the like |
| CN203479359U (en) * | 2013-09-27 | 2014-03-12 | 中国西电电气股份有限公司 | Expander oil level monitoring device for current transformer |
| CN206098136U (en) * | 2016-10-24 | 2017-04-12 | 红河学院 | High -voltage current mutual inductor |
| CN108318849A (en) * | 2018-03-19 | 2018-07-24 | 国网新疆电力有限公司 | A kind of wireless sensor device and wireless detecting system |
| CN108492971A (en) * | 2018-03-17 | 2018-09-04 | 国网新疆电力有限公司 | For the monitoring assembly of oil-immersed current transformer, installation method and monitoring system |
| CN208171323U (en) * | 2018-03-19 | 2018-11-30 | 国网新疆电力有限公司 | A kind of high pressure oil immersion current transformer detection system |
| CN109633396A (en) * | 2019-01-29 | 2019-04-16 | 武汉思融科技有限公司 | A kind of apparatus insulated defect on-line monitoring system of the few oil of electric power and method |
| CN209103916U (en) * | 2018-11-27 | 2019-07-12 | 江苏神马电力股份有限公司 | A kind of bushing shell for transformer |
| CN110631762A (en) * | 2019-11-01 | 2019-12-31 | 国网江苏省电力有限公司电力科学研究院 | Method for determining internal pressure criterion for mutual inductor fault early warning |
| CN211128358U (en) * | 2019-12-12 | 2020-07-28 | 上海超群无损检测设备有限责任公司 | Expander of 110KV circular X-ray source generator |
| CN111596181A (en) * | 2020-05-28 | 2020-08-28 | 华北电力大学（保定） | Transformer solid insulation aging evaluation method based on bubble escape temperature |
| CN111816431A (en) * | 2020-06-24 | 2020-10-23 | 张野峰 | Mutual inductor on-line monitoring device facing expander |
| CN111811571A (en) * | 2020-06-09 | 2020-10-23 | 国网新疆电力有限公司哈密供电公司 | Expander state detection device and detection system |
-
2020
- 2020-11-12 CN CN202011261904.1A patent/CN112557989A/en active Pending
Patent Citations (16)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN85203074U (en) * | 1985-07-22 | 1986-06-11 | 韩顺庆 | Transformer expand protector with wave shaped lobes |
| US20070027640A1 (en) * | 2005-07-28 | 2007-02-01 | Avistar, Inc. | Method and apparatus for monitoring SF6 gas and electric utility apparatus |
| JP2008064453A (en) * | 2007-10-22 | 2008-03-21 | Mitsubishi Electric Corp | Coolant leakage detecting method and refrigerating cycle device |
| US20110156918A1 (en) * | 2009-12-30 | 2011-06-30 | Eduardo Pedrosa Santos | System for monitoring oil level and detecting leaks in power transformers, reactors, current and potential transformers, high voltage bushings and the like |
| CN203479359U (en) * | 2013-09-27 | 2014-03-12 | 中国西电电气股份有限公司 | Expander oil level monitoring device for current transformer |
| CN206098136U (en) * | 2016-10-24 | 2017-04-12 | 红河学院 | High -voltage current mutual inductor |
| CN108492971A (en) * | 2018-03-17 | 2018-09-04 | 国网新疆电力有限公司 | For the monitoring assembly of oil-immersed current transformer, installation method and monitoring system |
| CN208171323U (en) * | 2018-03-19 | 2018-11-30 | 国网新疆电力有限公司 | A kind of high pressure oil immersion current transformer detection system |
| CN108318849A (en) * | 2018-03-19 | 2018-07-24 | 国网新疆电力有限公司 | A kind of wireless sensor device and wireless detecting system |
| CN209103916U (en) * | 2018-11-27 | 2019-07-12 | 江苏神马电力股份有限公司 | A kind of bushing shell for transformer |
| CN109633396A (en) * | 2019-01-29 | 2019-04-16 | 武汉思融科技有限公司 | A kind of apparatus insulated defect on-line monitoring system of the few oil of electric power and method |
| CN110631762A (en) * | 2019-11-01 | 2019-12-31 | 国网江苏省电力有限公司电力科学研究院 | Method for determining internal pressure criterion for mutual inductor fault early warning |
| CN211128358U (en) * | 2019-12-12 | 2020-07-28 | 上海超群无损检测设备有限责任公司 | Expander of 110KV circular X-ray source generator |
| CN111596181A (en) * | 2020-05-28 | 2020-08-28 | 华北电力大学（保定） | Transformer solid insulation aging evaluation method based on bubble escape temperature |
| CN111811571A (en) * | 2020-06-09 | 2020-10-23 | 国网新疆电力有限公司哈密供电公司 | Expander state detection device and detection system |
| CN111816431A (en) * | 2020-06-24 | 2020-10-23 | 张野峰 | Mutual inductor on-line monitoring device facing expander |
Non-Patent Citations (3)
| Title |
|---|
| 傅军;: "油浸变压器的在线检测与故障诊断", 油气田地面工程, no. 04 * |
| 杨敬娜;刘大永;: "变压器油中溶解气体的在线监测系统研究", 无线互联科技, no. 07 * |
| 黄云程;: "基于在线监测技术的电流互感器故障诊断方法", 东北电力技术, no. 03 * |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112557991A (en) * | 2020-11-12 | 2021-03-26 | 珠海一多监测科技有限公司 | Current transformer fault diagnosis method based on mole number and temperature |
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