CN114812696A - Main transformer conservator, oil level monitoring system and fault judgment method - Google Patents
Main transformer conservator, oil level monitoring system and fault judgment method Download PDFInfo
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- CN114812696A CN114812696A CN202210738518.XA CN202210738518A CN114812696A CN 114812696 A CN114812696 A CN 114812696A CN 202210738518 A CN202210738518 A CN 202210738518A CN 114812696 A CN114812696 A CN 114812696A
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- 238000012544 monitoring process Methods 0.000 title claims abstract description 80
- 238000000034 method Methods 0.000 title claims abstract description 15
- 238000012806 monitoring device Methods 0.000 claims description 34
- 238000004804 winding Methods 0.000 claims description 15
- 239000000523 sample Substances 0.000 claims description 14
- 230000008859 change Effects 0.000 claims description 11
- 230000002159 abnormal effect Effects 0.000 claims description 7
- 238000013528 artificial neural network Methods 0.000 claims description 7
- 238000012545 processing Methods 0.000 claims description 6
- 238000004891 communication Methods 0.000 claims description 4
- 238000007726 management method Methods 0.000 claims description 4
- 238000007405 data analysis Methods 0.000 claims description 3
- 238000013500 data storage Methods 0.000 claims description 3
- 238000007689 inspection Methods 0.000 claims description 3
- 238000004458 analytical method Methods 0.000 abstract description 5
- 238000001514 detection method Methods 0.000 abstract description 2
- 239000003921 oil Substances 0.000 description 208
- 239000002775 capsule Substances 0.000 description 19
- 238000007789 sealing Methods 0.000 description 5
- 238000010586 diagram Methods 0.000 description 3
- 230000007774 longterm Effects 0.000 description 3
- 230000009467 reduction Effects 0.000 description 3
- 230000005856 abnormality Effects 0.000 description 2
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- 239000002184 metal Substances 0.000 description 2
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- 230000004888 barrier function Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 230000015556 catabolic process Effects 0.000 description 1
- 238000013480 data collection Methods 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000006731 degradation reaction Methods 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01D—MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
- G01D21/00—Measuring or testing not otherwise provided for
- G01D21/02—Measuring two or more variables by means not covered by a single other subclass
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
- G01F23/00—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F27/00—Details of transformers or inductances, in general
- H01F27/40—Structural association with built-in electric component, e.g. fuse
- H01F27/402—Association of measuring or protective means
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F27/00—Details of transformers or inductances, in general
- H01F27/40—Structural association with built-in electric component, e.g. fuse
- H01F27/402—Association of measuring or protective means
- H01F2027/404—Protective devices specially adapted for fluid filled transformers
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Abstract
The invention discloses a main transformer conservator, an oil level monitoring system and a fault judgment method. The invention realizes the online monitoring of the transformer conservator and the oil level. The invention relates to an on-line monitoring solution for an oil conservator and an oil level of a power transformer based on combined analysis of main transformer oil temperature, oil conservator pressure, oil conservator oil level indication value and standard oil level, and can realize on-line detection and fault judgment of the main transformer oil conservator.
Description
Technical Field
The invention relates to the field of power transmission and distribution, in particular to a main transformer oil conservator, an oil level monitoring system and a fault determination method.
Background
The conservator is an important oil storage device widely used for power transformers. When the volume of transformer oil expanded or contracted along with temperature variation, the conservator played the regulation oil mass, guaranteed transformer tank full of the effect of oil all the time, and simultaneously, the conservator can completely cut off the direct contact of insulating oil and air, prevents that insulating oil from weing, slows down the degradation speed of insulating oil. Therefore, the good operation state of the conservator is very important for the safe and stable operation of the transformer.
However, the operational defects of the conservator are not uncommon. According to the operation experience, the fault phenomenon of the oil conservator mainly comprises a false oil level caused by oil level gauge fault, insulated oil affected with damp and false oil level caused by capsule fault, increased pressure bearing inside the oil conservator and false oil level caused by breather blockage, insulated oil affected with damp and false oil level caused by air intake of the oil conservator and the like.
According to research and study, the operation state of the oil conservator is lack of effective control for a long time. Besides the indication of the oil level, the oil conservator almost has no additional state monitoring means for effective application, and the problems that the current oil conservator oil level gauge is easy to fail, the mechanical gauge cannot perform online monitoring and early warning and cannot identify the internal parts of the oil conservator, such as capsule damage, gas circuit blockage, top gas accumulation and the like, only through oil level indication, and the requirement of daily operation and maintenance and management of the oil conservator cannot be effectively met through simple oil level indication, so that the monitoring significance of the running state of the oil conservator is very obvious.
Disclosure of Invention
The invention aims to provide a main transformer conservator and oil level monitoring device and a fault judgment method, which are an on-line monitoring solution for the oil conservator and the oil level of a power transformer based on the joint analysis of the main transformer oil temperature, the oil conservator pressure, the oil conservator oil level indication value and the standard oil level, and can realize the on-line detection and fault judgment of the main transformer conservator.
The actual and research shows that: no matter the capsule type conservator, the diaphragm type conservator or the corrugated type conservator, the internal pressure intensity of the conservator can change along with the change of the operating state of the conservator. The model is simplified as follows:
P(T)= P 1 (T)+ P 2 (T)+ P 3 (T)
wherein P (T) is the internal pressure of the conservator, P 1 (T) is the column pressure of oil when the internal pressure of the conservator is balanced, P 2 (T) is a pressure due to an elastic force between the bladder or the expander and the oil surface when the pressure inside the conservator is balanced, P 3 (T) is the gas produced by the conservator under abnormal gas collectionThe resulting pressure.
All the pressure of each part is influenced by the temperature of the main variable oil, and the pressure is interacted and coupled to finally achieve pressure balance. Thus, the pressure may reflect the overall operating state of the conservator.
In order to achieve the purpose, the invention is realized by adopting the following technical scheme:
become conservator and oil level monitoring system, including conservator pressure monitoring devices, become oil temperature monitoring devices, oil level gaugember indicating value monitoring devices, standard oil level monitoring module and monitoring system host computer, the monitoring system host computer is used for receiving conservator pressure monitoring devices, becomes oil temperature monitoring devices, oil level gaugember indicating value monitoring devices's output data and standard oil temperature oil level data.
Preferably, the conservator pressure monitoring device comprises a pressure sensor communicated with an oil discharge port of the main transformer conservator, and the pressure sensor is in wired and/or wireless connection with a monitoring system host.
Preferably, the pressure sensor is communicated with an outlet of the three-way valve, an inlet of the three-way valve is communicated with one end of the oil discharge valve, and the other end of the oil discharge valve is connected with an oil discharge port of the main transformer oil conservator.
Furthermore, a stop valve is arranged at the other outlet of the three-way valve.
Preferably, the main transformer oil temperature monitoring device comprises a pincerlike direct current probe, an RS485 acquisition terminal or a voltage monitoring module;
the number of the pincerlike direct current probes is two, and the pincerlike direct current probes are respectively and additionally arranged on a standard 4-20 mA current output loop of a top layer oil temperature transmitter and a winding oil temperature transmitter of a main transformer;
the RS485 acquisition terminal is additionally arranged on an RS485 output loop of a main transformer top layer oil temperature changer and a winding oil temperature changer;
the voltage monitoring module is additionally arranged on a standard 0-5V voltage output loop of a top layer oil temperature transformer and a winding oil temperature transmitter of the main transformer;
the pincerlike direct current probe, the RS485 acquisition terminal or the voltage monitoring module outputs top layer oil temperature data of the main transformer and winding oil temperature data;
the pincerlike direct current probe is connected with a monitoring system host through a coaxial cable;
the RS485 acquisition terminal is in communication connection with the monitoring system host;
and the voltage monitoring module is connected with the monitoring system host.
Preferably, the oil level indicator monitoring device comprises a camera or a collection terminal additionally arranged on an output loop of the digital oil level indicator, the camera acquires an image of the pointer type oil level indicator and transmits the image to a monitoring system host, and the monitoring system host identifies the indicating position of the pointer type oil level indicator by using an image processing algorithm to acquire oil level indicator data; the acquisition terminal acquires oil level data of the digital oil level indicator and is connected with the monitoring system host.
Preferably, the standard oil level monitoring module includes standard oil temperature oil level data and oil temperature monitoring data, and the standard oil level is obtained through the oil temperature monitoring data by using a table look-up method.
Preferably, the monitoring system host is used for receiving the oil conservator pressure data, the main transformer oil temperature data, the oil level gauge image and the standard oil temperature and oil level data, and performing data storage, data analysis, abnormal judgment and fault early warning;
the monitoring system host is accessed to the Huawei Internet of things platform and/or the operation and inspection management and control platform through the comprehensive data network.
The invention also discloses a main transformer conservator fault judging method, which is characterized in that according to the incidence relation model, the change rule of the TPFI incidence relation and the internal rule of the TPFI characteristic relation are compared, and the component fault of the main transformer conservator is judged;
the incidence relation model is a neural network, the input quantity of the neural network is main transformer top layer oil temperature T1, main transformer winding oil temperature T2, oil conservator pressure P, oil level indicator F and standard oil level I, and the output quantity is pressure P and oil level indicator F.
Preferably, the rule for determining the fault of the component of the main transformer conservator is as follows:
| serial number | Device exception | Law of T-I | Law of T-F | Law of T-P | P-F law |
| 1 | Respirator plug | Is not changed | Wave enhancement | Wave enhancement | Variations in |
| 2 | Sealing failure of the air release valve | Is not changed | Wave attenuation | Wave attenuation | Variations in |
| 3 | Breakage of capsule | Is not changed | Variations in | Variations in | Variations in |
| 4 | The capsule falls off | Is not changed | Wave attenuation | Wave attenuation | Variations in |
| 5 | Oil level gauge failure | Is not changed | Does not fluctuate | Is not changed | Does not fluctuate |
| 6 | Gas collection at the top of conservator | Is not changed | Variations in | Variations in | Variations in |
| 7 | Main transformer oil seepage | Is not changed | Dynamic descent | Dynamic descent | Variations in |
Compared with the prior art, the invention has the following beneficial effects:
1. the invention can realize the omnibearing state monitoring analysis and early warning of the conservator, and specifically comprises the following steps: analyzing the blockage problem of the respirator; analyzing the fault of the oil level gauge; analyzing the sealing performance of the metal cavity, such as the sealing failure of a deflation valve; analyzing the sealing performance of the capsule or the corrugated expander in the oil conservator, such as the breakage of the capsule; analyzing gas accumulation at the top of the oil conservator; analyzing the pressure out-of-limit; alarming at high oil level; and (5) alarming at low oil level.
2. The pressure intensity monitoring device of the oil conservator realizes the on-line monitoring double-correlation comparison mode of the oil level of the main transformer oil conservator, and avoids the generation of false oil level.
3. The oil conservator pressure monitoring device is high in anti-interference capacity, and validity and accuracy of data can be effectively guaranteed.
Drawings
FIG. 1 is a graphical representation of oil temperature-oil level data.
Fig. 2 is a system architecture diagram of the present invention.
Fig. 3 is a cross-sectional view of a conservator pressure monitoring device.
FIG. 4 is a schematic diagram of a main transformer oil temperature monitoring device.
Fig. 5 is a TPFI association model neural network diagram.
FIG. 6 is a schematic view showing a method for identifying the indication position of the pointer-type oil level gauge using an image processing algorithm.
In the figure: 1. a filtering respirator; 2. a pointer type oil level gauge; 3. a main transformer conservator; 10. An oil discharge port; 11. an oil drain valve; 12. a pressure sensor; 13. a stop valve; 14. a three-way valve; 15. a gas relay.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail below with reference to the accompanying drawings.
Example 1
As shown in fig. 1, when the main transformer normally works, the relationship between the oil level and the oil temperature should be consistent with the relationship between the oil level and the oil temperature given by the main transformer and the oil conservator manufacturer, which is almost the only quantifiable basis for determining the current oil level. Therefore, whether the oil level is abnormal or not can be judged according to the measured oil temperature, the field oil level indication value and the standard oil temperature-oil level curve, and the reason of the oil level abnormality can be further deduced.
As shown in fig. 2, the main transformer conservator and oil level monitoring system disclosed in this embodiment includes an conservator pressure monitoring device, a main transformer oil temperature monitoring device, an oil level indicator monitoring device, a standard oil level monitoring module, and a monitoring system host, where the monitoring system host is configured to receive output data of the conservator pressure monitoring device, the main transformer oil temperature monitoring device, and the oil level indicator monitoring device, and a standard oil temperature-oil level curve.
Specifically, the pressure monitoring of the oil drain 10 of the conservator is used for acquiring the pressure data inside the conservator; the main transformer oil temperature monitoring is used for acquiring main transformer oil temperature data; the oil level indicator value monitoring is used for acquiring meter display oil level data; the monitoring system host is used for realizing data collection, storage and analysis, and fault judgment and early warning; the PMS or the operation and inspection management and control platform is applied to displaying and inquiring the intranet system.
Example 2
As shown in fig. 3, the conventional main transformer conservator 3 includes an air bag disposed inside thereof, and a filtering respirator 1, a pointer type oil level indicator 2, a gas relay 15, an oil outlet 10 and an oil drain valve 11 are disposed on an air charging/discharging pipeline of the air bag.
On the basis of embodiment 1, the present embodiment specifically discloses an oil conservator pressure monitoring device as follows:
the three-way valve 14 is a flow dividing valve, the pressure sensor 12 is communicated with one outlet of the three-way valve 14, an inlet of the three-way valve 14 is communicated with one end of the oil discharge valve 11, the other end of the oil discharge valve 11 is connected with the oil discharge port 10 of the main transformer conservator, and a stop valve 13 is arranged on the other outlet of the three-way valve 14.
The pressure sensor 12 adopts a high-precision monocrystalline silicon sensor chip, and has the advantages of high accuracy of 0.075%, small temperature drift and good long-term stability. The measuring range of the pressure sensor is selected according to the height of the oil conservator, and 0-100 kPa, 0-250 kPa and 0-500 kPa can be selected.
The pressure sensor 12 is in wired and/or wireless communication with the monitoring system host.
Example 3
As shown in fig. 4, the present embodiment specifically discloses, on the basis of embodiment 1 or 2, a main transformer oil temperature monitoring device as follows:
the main transformer oil temperature monitoring device comprises a pincer-shaped direct current probe, an RS485 acquisition terminal or a voltage monitoring module;
two pincer-shaped direct current probes are respectively and additionally arranged on a standard 4-20 mA current output loop of a main transformer top layer oil temperature transmitter and a winding oil temperature transmitter;
the RS485 acquisition terminal is additionally arranged on an RS485 output loop of the main transformer top layer oil temperature changer and the winding oil temperature changer;
the voltage monitoring module is additionally arranged on a standard 0-5V voltage output loop of a main transformer top layer oil temperature transformer and a winding oil temperature transmitter;
the pincer-shaped direct current probe, the RS485 acquisition terminal or the voltage monitoring module outputs the top layer oil temperature data of the main transformer and the winding oil temperature data;
the pincerlike direct current probe is connected with a monitoring system host through a coaxial cable;
the RS485 acquisition terminal is in communication connection with the monitoring system host;
the voltage monitoring module is connected with the monitoring system host.
Example 4
The present embodiment specifically discloses, on the basis of embodiment 1, 2 or 3, an oil level gauge value monitoring device as follows:
as shown in fig. 6, the oil level gauge indication value monitoring device includes a camera head that acquires an image of the pointer oil level gauge 2 and transmits the image to a monitoring system main unit that recognizes the indicated position of the pointer oil level gauge 2 by using an image processing algorithm to acquire oil level data.
The specific method for identifying the indication position of the pointer-type oil level indicator 2 by using the image processing algorithm comprises the following steps:
1) intercept ROI (region of interest): color correction and tilt correction are performed on the image, and an area image including an oil level indication is extracted.
2) And (5) carrying out image binarization processing. Carrying out binarization on the region image containing the oil level indication, and searching a connected region, a screening perimeter, an area and the like;
3) the start tick mark, the end tick mark, and the oil level indicator line are extracted. And extracting left and right boundary points of the image, respectively performing straight line fitting on the boundary points, and calculating a start scale mark, an end scale mark and an oil level gauge pointer line of the pointer type oil level gauge 2.
4) And calculating a scale value. And calculating the included angle of the three straight lines of the starting scale mark, the ending scale mark and the oil level pointer line and the proportional relation between the scales and the included angle, and calculating the current scale value.
Example 5
The implementation discloses a method for judging faults of a main transformer conservator, wherein according to an incidence relation model, the change rule of TPFI incidence relation and the internal rule of the characteristic relation of TPFI are compared, and component faults of the main transformer conservator are judged.
As shown in fig. 5, the correlation model is a neural network, the input variables of the neural network are the main transformer top layer oil temperature T1, the main transformer winding oil temperature T2, the pressure P, the field oil level indicator F and the standard oil level value I, and the output variables are the pressure P and the oil level indicator F.
Specifically, the method comprises the following steps: based on long-term monitoring data of the pressure intensity of the oil conservator and the indication value of the oil level gauge, establishing a relation between the pressure intensity of the oil conservator and the indication value of the oil level gauge under normal conditions by using an artificial intelligence method;
based on long-term monitoring data of the oil temperature and the oil level indicating value of the main transformer, establishing the relationship between the oil temperature and the oil level indicating value of the main transformer under the normal condition by using an artificial intelligence method;
establishing a relation between the main transformer oil temperature and an oil level gauge indicating value under a standard condition based on design parameters of an oil conservator manufacturer and a main transformer manufacturer;
and establishing an incidence relation and an operation rule of a four-dimensional space of 'main transformer oil temperature T-conservator pressure P-field oil level indication F-standard oil level value I'.
And the analysis, judgment and early warning of the abnormal relation between the oil level and the oil temperature and the abnormal oil level gauge are realized through the T-P-F-I operation rule.
The specific decision rule is as follows:
| serial number | Abnormality of equipment | Feature analysis | Law of T-I | Law of T-F | Law of T-P | P-F law | Whether or not to recognize |
| 0 | Without abnormal conditions In a state of being immersed in | The capsule or metal expander can freely expand and contract under the condition of temperature change, the indication value of the oil level gauge normally changes, and oil Pillow pressure, oil level indication and oil temperature change rule are stable | Is not changed | Is not changed | Is not changed | Is not changed | / |
| 1 | Respirator plug Plug for medical use | Equivalent to a closed space, the pressure of the capsule or the expander can not be released, the pressure of the conservator and oil The bit gauge value is very significantly changed by the temperature. | Is not changed | Increase of wave motion High strength | Wave enhancement | Variations in | Can be used for |
| 2 | Air release valve seal Seal failure | The oil level of the conservator can be obviously reduced, the original pressure balance relation between the inside and the outside of the capsule is destroyed, and the capsule is reversed Expand or contract and finally float on the oil surface. At this time, the capsule is elasticReduced strength and warmth The fluctuation of the pressure intensity of the oil conservator and the indication value of the oil level gauge is weakened when the degree changes. | Is not changed | Wave motion reduction Weak (weak) | Wave attenuation | Variations in | Can be used for |
| 3 | Breakage of capsule | And the sealing failure of the air release valve is similar to that of the air release valve when the air release valve is seriously damaged. When the oil is slightly damaged, the oil level has a certain stroke The capsule can deform to a certain degree due to the reduction of the temperature, and the pressure of the conservator is influenced by the temperature The change law with the oil level gauge indication is broken. | Is not changed | Variations in | Variations in | Variations in | Can be used for |
| 4 | The capsule falls off | The oil surface after falling off is communicated with the atmosphere through a respirator. The oil level of the conservator can be obviously reduced and the capsules are reversed To expand or contract and finally float on the oil surface. At this time, the elastic force of the capsule is weakened, when the temperature changes, the fluctuation of the pressure intensity of the oil conservator and the indication value of the oil level gauge is weakened. | Is not changed | Wave motion reduction Weak (weak) | Wave attenuation | Variations in | Can be used for |
| 5 | Oil level indicatorTherefore, it is Barrier | The pressure of the oil conservator is not influenced and still fluctuates according to the normal operation rule, but the indication value of the oil level is kept at A certain value is not changed. | Is not changed | Does not fluctuate | Is not changed | Does not fluctuate | Can be used for |
| 6 | Top of the conservator Gas collection | The oil level of the conservator can be reduced, the shape of the capsule can be changed, and the conservator is influenced by the temperature The change law of the pressure and the oil level gauge is destroyed, and the fluctuation may be increased or decreased. | Is not changed | Variations in | Variations in | Variations in | Can be used for |
| 7 | Main transformer oil seepage | The oil level of the conservator can be continuously reduced, the capsule can be continuously expanded, and the pressure and oil level of the conservator are measured according to the measured values The temperature is in a dynamic descending trend. | Is not changed | Under the dynamic state Descend | Dynamic descent | Variations in | Can be used for |
| 8 | Other exceptions | Determined by actual anomalies | Is not changed | Change of | Changes to | Change of | Can be used for |
The present invention is capable of other embodiments, and various changes and modifications may be made by one skilled in the art without departing from the spirit and scope of the invention as defined in the appended claims.
Claims (9)
1. Become conservator and oil level monitoring system, its characterized in that: the monitoring system comprises a conservator pressure monitoring device, a main transformer oil temperature monitoring device, an oil level indicator monitoring device, a standard oil level monitoring module and a monitoring system host, wherein the monitoring system host is used for receiving output data of the conservator pressure monitoring device, the main transformer oil temperature monitoring device and the oil level indicator monitoring device and standard oil temperature and oil level data.
2. The main transformer conservator and oil level monitoring system of claim 1, wherein: the pressure monitoring device of the oil conservator comprises a pressure sensor communicated with an oil discharge port of the main transformer oil conservator, and the pressure sensor is in wired and/or wireless connection with a monitoring system host.
3. The main transformer conservator and oil level monitoring system of claim 2, wherein: the pressure sensor is communicated with an outlet of the three-way valve, an inlet of the three-way valve is communicated with one end of the oil discharge valve, and the other end of the oil discharge valve is connected with an oil discharge port of a main transformer oil conservator.
4. The main transformer conservator and oil level monitoring system according to claim 3, wherein: and a stop valve is arranged on the other outlet of the three-way valve.
5. The main transformer conservator and oil level monitoring system according to any one of claims 1-4, wherein: the main transformer oil temperature monitoring device comprises a pincerlike direct current probe, an RS485 acquisition terminal or a voltage monitoring module;
the number of the pincerlike direct current probes is two, and the pincerlike direct current probes are respectively and additionally arranged on a standard 4-20 mA current output loop of a top layer oil temperature transmitter and a winding oil temperature transmitter of a main transformer;
the RS485 acquisition terminal is additionally arranged on an RS485 output loop of a main transformer top layer oil temperature changer and a winding oil temperature changer;
the voltage monitoring module is additionally arranged on a standard 0-5V voltage output loop of a top layer oil temperature transformer and a winding oil temperature transformer of the main transformer;
the pincerlike direct current probe, the RS485 acquisition terminal or the voltage monitoring module outputs top layer oil temperature data of the main transformer and winding oil temperature data;
the pincerlike direct current probe is connected with a monitoring system host through a coaxial cable;
the RS485 acquisition terminal is in communication connection with the monitoring system host;
the voltage monitoring module is connected with the monitoring system host.
6. The main transformer conservator and oil level monitoring system of claim 5, wherein: the oil level indicator monitoring device comprises a camera or a collection terminal additionally arranged on an output loop of the digital oil level indicator, the camera acquires an image of the pointer type oil level indicator and transmits the image to a monitoring system host, and the monitoring system host identifies the indicating position of the pointer type oil level indicator by using an image processing algorithm to acquire oil level indicator data; the acquisition terminal acquires oil level data of the digital oil level indicator and is connected with the monitoring system host.
7. The main transformer conservator and oil level monitoring system of claim 6, wherein: the standard oil level monitoring module comprises standard oil temperature and oil level data and oil temperature monitoring data, and the standard oil level is obtained through the oil temperature monitoring data by using a table look-up method.
8. The main transformer conservator and oil level monitoring system of claim 7, wherein: the monitoring system host is used for receiving the oil conservator pressure data, the main transformer oil temperature data, the oil level gauge image and the standard oil temperature and oil level data, and performing data storage, data analysis, abnormal judgment and fault early warning;
the monitoring system host is accessed to the Huawei Internet of things platform and/or the operation and inspection management and control platform through the comprehensive data network.
9. The main transformer conservator fault determination method applicable to the main transformer conservator and oil level monitoring system according to claim 7 or 8, characterized in that: according to the incidence relation model, comparing a change rule of the TPFI incidence relation with an internal rule of the TPFI characteristic relation, and judging the component fault of the main transformer conservator;
the incidence relation model is a neural network, the input quantity of the neural network is main transformer top layer oil temperature T1, main transformer winding oil temperature T2, oil conservator pressure P, oil level indicator F and standard oil level I, and the output quantity is pressure P and oil level indicator F.
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