CN212645769U - Intelligent oil level gauge and transformer oil conservator - Google Patents
Intelligent oil level gauge and transformer oil conservator Download PDFInfo
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- CN212645769U CN212645769U CN202021100126.3U CN202021100126U CN212645769U CN 212645769 U CN212645769 U CN 212645769U CN 202021100126 U CN202021100126 U CN 202021100126U CN 212645769 U CN212645769 U CN 212645769U
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Abstract
The utility model provides an intelligence oil level gaugember and transformer store up oil tank, wherein, intelligence oil level gaugember includes: the oil level monitoring module comprises a pressure sensor and a temperature sensor which are integrated into a whole, the pressure sensor is used for collecting pressure signals of oil in the transformer oil conservator, and the temperature sensor is used for collecting temperature signals of the oil in the transformer oil conservator; and the display module is electrically connected with the oil level monitoring module and is used for receiving the pressure signal and the temperature signal output by the oil level monitoring module, converting the pressure signal into an oil level signal and displaying an oil level value, a pressure value and a temperature value of oil in the oil conservator of the transformer according to the oil level signal, the pressure signal and the temperature signal. The intelligent oil level gauge provided by the embodiment can acquire information such as oil pressure, oil temperature and oil level in the oil conservator in real time, and when the oil level of the oil conservator is monitored, the safety monitoring of the oil pressure and the oil temperature in the transformer oil conservator is realized.
Description
Technical Field
The utility model relates to a power equipment detects technical field, especially relates to an intelligence oil level gaugember and transformer stores up oil tank.
Background
The oil level indicator is an oil level indicator for power devices such as oil immersed power transformers, rectifier transformers, special transformers and reactors, belongs to an important component in distribution transformers, and is usually installed on an oil storage cabinet of the transformer.
In the existing oil level gauge measuring mode, the change of an oil level is generally transmitted to a transmission device of the oil level gauge through a telescopic rod or a floating ball, and a pointer is driven to indicate the height of the oil level through magnetic coupling, so that the oil level in an oil conservator of a transformer is measured. In practical application, potential safety hazards can be caused by overhigh oil temperature or overhigh oil pressure in the transformer oil conservator, the current oil level gauge only has a pure oil level monitoring function, in order to improve the safety performance of the transformer oil conservator, the oil level gauge sends out alarm signals at the highest and the lowest of the oil level, but the mode still alarms according to the oil level condition and does not solve the potential safety hazards caused by overhigh oil temperature and overhigh oil pressure in the transformer oil conservator.
Therefore, it is an urgent need to provide an oil level gauge capable of monitoring multiple parameters of oil level, oil temperature and oil pressure in a transformer oil conservator in real time to ensure the safety of the transformer oil conservator.
Disclosure of Invention
The utility model provides an intelligence oil level meter takes into account transformer and stores up oil tank, and the oil level meter can information such as oil pressure, oil temperature and oil level in the real-time supervision stores up oil tank, when measuring the oil storage tank oil level, realizes the safety monitoring to oil pressure and oil temperature in the transformer stores up oil tank.
According to an aspect of the disclosed embodiments, there is provided an intelligent oil level gauge including:
the oil level monitoring module comprises a pressure sensor and a temperature sensor which are integrated into a whole, the pressure sensor is used for collecting pressure signals of oil in the transformer oil conservator, and the temperature sensor is used for collecting temperature signals of the oil in the transformer oil conservator; and the number of the first and second groups,
and the display module is electrically connected with the oil level monitoring module and is used for receiving the pressure signal and the temperature signal output by the oil level monitoring module, converting the pressure signal into an oil level signal and displaying an oil level value, a pressure value and a temperature value of oil in the oil conservator of the transformer according to the oil level signal, the pressure signal and the temperature signal.
In one embodiment, the intelligent oil level indicator further comprises:
the first connecting piece, first connecting piece set up in oil level monitoring module with between the display module, it is used for connecting the two and is fixed in on the transformer oil conservator, and oil level monitoring module is located inside the transformer oil conservator, the display module is located the transformer oil conservator is outside.
In one embodiment, the integrated pressure and temperature sensor comprises: the temperature sensor comprises a shell, a pressure sensor chip, a temperature sensor chip and a chip packaging body used for packaging the pressure sensor chip and the temperature sensor chip in the shell.
In one embodiment, the housing comprises: a housing body, a cover body and a first fixing part,
the shell body is provided with a first hollow cavity, openings are formed in two sides of the shell body, the first hollow cavity is used for placing the pressure sensor chip, the temperature sensor chip and the chip packaging body, and the cover body is arranged at the opening, far away from one side of the display module, of the shell body;
the first fixing part is arranged at an opening of the shell body close to one side of the display module.
In one embodiment, the chip package includes: the packaging body comprises a packaging body and a second fixing part which is arranged on the packaging body and matched with the first fixing part.
In one embodiment, the fuel level monitoring module further comprises a first communication connector and a second communication connector disposed within the housing,
one end of the first communication joint is electrically connected with a pin outgoing line of the pressure sensor chip, and the other end of the first communication joint is electrically connected with a power line of the display module;
one end of the second communication joint is electrically connected with the pin outgoing line of the temperature sensor chip, and the other end of the second communication joint is electrically connected with the power line of the display module.
In one embodiment, the intelligent oil level indicator further comprises:
the two ends of the supporting rod are respectively connected with the oil level monitoring module and the display module;
the supporting rod is provided with a second hollow cavity, and the second hollow cavity is used for placing and connecting the oil level monitoring module and a cable of the display module.
According to another aspect of the embodiments of the present disclosure, there is provided a transformer conservator, including: the oil conservator comprises an oil conservator shell and the intelligent oil level gauge at least partially inserted into the oil conservator shell.
In one embodiment, the transformer conservator further comprises: set up in on the oil conservator casing and be used for with intelligence oil level gaugember is fixed in second connecting piece on the oil conservator casing.
The technical scheme provided by the embodiment of the disclosure can have the following beneficial effects:
the intelligent oil level indicator provided by the embodiment of the disclosure is provided with the oil level monitoring module, wherein the oil level monitoring module comprises a pressure sensor and a temperature sensor which are integrated into a whole, the oil level monitoring module monitors an oil temperature signal and an oil pressure signal in the oil conservator of the transformer, the display module receives the pressure signal and the temperature signal output by the oil level monitoring module, the pressure signal is converted into the oil level signal, and the oil level numerical value, the pressure numerical value and the temperature numerical value of the oil in the oil conservator of the transformer are displayed according to the oil level signal, the pressure signal and the temperature signal. The intelligent oil level gauge provided by the embodiment can acquire information such as oil pressure, oil temperature and oil level in the oil conservator in real time, and when the oil level of the oil conservator is monitored, the safety monitoring of the oil pressure and the oil temperature in the transformer oil conservator is realized.
Additional features and advantages of the disclosure will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by the practice of the disclosure. The objectives and other advantages of the disclosure may be realized and attained by the structure particularly pointed out in the written description and claims hereof as well as the appended drawings.
Drawings
The accompanying drawings are included to provide a further understanding of the disclosed embodiments and are incorporated in and constitute a part of this specification, illustrate embodiments of the disclosure and together with the example serve to explain the principles of the disclosure and not to limit the disclosure.
Fig. 1 is a schematic structural diagram of an intelligent oil level indicator provided in an embodiment of the present disclosure;
fig. 2 is a schematic structural diagram of a transformer conservator provided in the embodiment of the present disclosure;
FIG. 3 is a schematic structural diagram of a pressure sensor in an embodiment of the present disclosure;
FIG. 4 is a circuit diagram of an application of a temperature sensor in an embodiment of the present disclosure;
fig. 5 is a schematic structural diagram of a transformer conservator according to another embodiment of the present disclosure.
In the figure, 100-intelligent oil level indicator; 110-oil level monitoring module; 111-a pressure sensor chip; 112-temperature sensor chip; 113-a chip package; 1131 — a second fixing part; 1141-a housing body; 1142-a cover body; 1143-a first fixed part; 115-a first communication connector; 116-a second communication connector; 117-peripheral base; 118-a ceramic diaphragm; 119-glass sealing; 120-a display module; 130-a first connector; 140-a support bar; 121-outlet interface; 200-transformer conservator; 210-conservator housing; 220-capsule preparation; 230-second connector.
Detailed Description
To make the objects, technical solutions and advantages of the embodiments of the present disclosure more apparent, specific embodiments of the present disclosure are described below in detail with reference to the accompanying drawings. It should be understood that the detailed description and specific examples, while indicating the present disclosure, are given by way of illustration and explanation only, not limitation.
It should be noted that the terms "first," "second," and the like in the description and claims of the present disclosure and in the above-described drawings are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order; also, the embodiments and features of the embodiments in the present disclosure may be arbitrarily combined with each other without conflict.
In which the terminology used in the embodiments of the disclosure is for the purpose of describing particular embodiments only and is not intended to be limiting of the disclosure. As used in the disclosed embodiments and the appended claims, the singular forms "a," "an," and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise.
The conventional oil level gauge only has a simple oil level monitoring function, but does not have multiple functions of oil temperature and oil pressure monitoring. The embodiment of the disclosure aims to optimally integrate a pressure sensor and a temperature sensor in the structure, and install the integrated comprehensive sensor on an oil level gauge of an oil conservator of a transformer, so as to realize real-time online monitoring of the oil conservator of the transformer. Meanwhile, the acquired pressure, temperature and oil level information can be transmitted to a remote monitoring platform or mobile phone software of monitoring workers by using a network through display, so that intelligent monitoring of the transformer oil conservator is realized.
Referring to fig. 1-4, fig. 1 is a schematic structural diagram of an intelligent oil level indicator 100 according to an embodiment of the present disclosure, which includes an oil level monitoring module 110 and a display module 120, wherein,
the oil level monitoring module 110 includes an integrated pressure sensor and a temperature sensor, the pressure sensor is used for collecting pressure signals of the oil in the transformer oil conservator, and the temperature sensor is used for collecting temperature signals of the oil in the transformer oil conservator.
Compared with the prior art, the oil level change is transmitted to the transmission device of the oil level indicator through the telescopic rod or the floating ball, then the pointer is driven to indicate the height of the oil level through the magnetic coupling, the oil level measurement in the transformer oil conservator is realized, the measurement mode is mechanized, the function is simple, the information of oil temperature, oil pressure and the like in the transformer oil conservator cannot be effectively monitored, the embodiment utilizes the integrated pressure sensor and the integrated temperature sensor to realize the intelligent measurement of the oil level and the oil pressure by collecting the pressure information of the oil in the oil conservator, the oil level height is measured based on the change of the oil pressure in the transformer oil conservator, the oil temperature, the oil pressure and the oil level multi-parameter information in the transformer oil conservator can be monitored in real time through the integrated pressure sensor and the integrated temperature sensor, the real condition of the transformer oil conservator is, whether to carry out maintenance and other treatment is determined according to needs so as to prevent major accident damage and ensure the safety of the transformer oil conservator; in addition, on the basis of the integrated pressure sensor and temperature sensor, the structure and operation of the main equipment do not need to be changed, and meanwhile, other oil level measuring devices do not need to be added, so that the oil conservator of the transformer can be monitored on line, and the production cost can be effectively reduced.
The display module 120 is electrically connected to the oil level monitoring module 110, and is configured to receive the pressure signal and the temperature signal output by the oil level monitoring module 110, convert the pressure signal into an oil level signal, and display an oil level value, a pressure value, and a temperature value of oil in the transformer conservator according to the oil level signal, the pressure signal, and the temperature signal.
In this embodiment, the oil level monitoring module 110 sends the collected oil pressure signal and oil level signal to the display module 120, the display module 120 converts the pressure signal into an oil level signal, then the oil level, oil pressure and oil temperature value of the oil in the oil storage tank are displayed on a screen, and further, in some embodiments, the display module transmits the data to a remote monitoring platform of a worker and mobile phone software through a GPRS network, so as to realize remote monitoring of the worker, further, an alarm function can be set, an oil level threshold, a pressure threshold and a temperature threshold are set, wherein, the technical personnel in the field can adaptively set the oil level threshold value, the pressure threshold value and the temperature threshold value by combining with the actual request of the transformer factory, when the threshold value is exceeded, an alarm prompt is sent out, so that the potential safety hazard possibly generated by the transformer oil conservator can be solved by workers in time.
In practical application, the pressure sensor may be a silicon piezoresistive transformer, wherein the structure diagram of the silicon piezoresistive transformer is shown in fig. 3, and the silicon piezoresistive transformer includes a pressure sensor chip 111, a peripheral base 117, a ceramic diaphragm 118, and a glass seal 119, and the principle of the silicon piezoresistive transformer is that pressure directly acts on the ceramic diaphragm 118 of the silicon piezoresistive pressure sensor, the pressure sensor chip 111 inside the sensor is made of a silicon single crystal material, and by means of a phenomenon that resistivity of the silicon single crystal material changes under the action of an external force (piezoresistive effect principle), the silicon piezoresistive transformer can be used TO detect whether the sensor is under pressure, and a changed resistance value of the silicon single crystal material is in a proportional corresponding relation with the pressure, and then a corresponding pressure signal is output, the silicon piezoresistive pressure sensor adopting a TO-5 nickel metal technology packaging structure is designed without a piezoresistor, pressure directly acts on the top of the sensor, and an absolute pressure type pressure sensor, the range of measurement is from 0-5 PSI to 0-500 PSI. The structural design that the pressure medium surrounds the chip is adopted, so that the pressure medium can be applied to transformer insulating liquid; the temperature sensor may be a platinum resistance temperature sensor, and for the platinum resistance temperature sensor, the embodiment adopts a wheatstone balance bridge method to collect, and the schematic diagram of the current is shown in fig. 4.
Further, the intelligent oil level gauge 100 further includes:
first connecting member 130, first connecting member 130 is disposed between oil level monitoring module 110 and display module 120, and is used for connecting and fixing the two to transformer conservator 200, and oil level monitoring module 110 is located inside transformer conservator 200, and display module 120 is located outside transformer conservator 200.
Specifically, first connecting piece 130 can adopt the link-up ware, and it is inside that oil level monitoring module 110 based on the link-up ware makes intelligent oil level gaugember stretches into transformer oil conservator, makes the display module stretch out simultaneously the transformer oil conservator is outside, combine fig. 2 and below show about transformer oil conservator embodiment, second connecting piece 230 adopts the through-plate, sets up on transformer oil conservator, through link-up ware and through the detachable connection between the dish, can make intelligent oil level gaugember install and dismantle conveniently on transformer oil conservator to the maintenance and the change of intelligent oil level gaugember.
It should be noted that the above is only an example of the first connecting element and the second connecting element, and is not a limitation of the present disclosure, and in some embodiments, the first connecting element and the second connecting element may also adopt other structural designs.
Referring to fig. 5, fig. 5 is a schematic structural diagram of an intelligent oil level indicator according to another embodiment of the present disclosure, based on the above embodiment, in this embodiment, a pressure sensor and a temperature sensor integrated into a whole adopt a core packaging technology, and the pressure sensor and the temperature sensor are integrated into a whole, specifically, the pressure sensor and the temperature sensor integrated into a whole include a housing, a pressure sensor chip 111, a temperature sensor chip 112, and a chip package 113 for packaging the pressure sensor chip 111 and the temperature sensor chip 112 in the housing.
Specifically, the chip packaging body is of a hollow structure, the pressure sensor chip and the temperature sensor chip are packaged inside the shell based on the chip packaging body, wherein the pressure sensor chip and the temperature sensor chip can be arranged in parallel, and pin outgoing lines of the two chips penetrate through the inside of the chip packaging body, so that the pin outgoing lines of the chips are connected with a power line of the display module, and signal transmission is achieved.
Further, the housing includes a housing body 1141, a cover 1142 and a first fixing portion 1143,
the housing body 1141 has a first hollow cavity opened at both sides thereof for accommodating the pressure sensor chip 111, the temperature sensor chip 112 and the chip package 113,
the cover 1142 is disposed at an opening of the housing away from the display module 120;
the first fixing portion 1143 is disposed at an opening of the housing close to one side of the display module 120.
Specifically, first fixed part can adopt fixation nut's mode, and the lid also is the closing cap, and it can be understood that inside hollow structure that also is of first fixed part for display module's power cord can be connected with the chip pin lead-out wire in the oil level monitoring module.
In one embodiment, the chip package 113 includes: the package body and the second fixing portion 1131 disposed on the package body and matching with the first fixing portion 1143.
Specifically, the one end that the chip package body is close to first fixed part is provided with first fixed part complex second fixed part, realizes fixing between chip package body and the first fixed part, and then reaches the encapsulation and the fixing of chip in the shell, can set up to the form of nut and bolt fastening, promptly, first fixed part adopts fixation nut, and one side that the chip package body is close to this fixation nut sets up the bolt. In practical applications, other fixing manners may also be adopted, and are not described herein again.
It can be understood that the first fixing portion fixes the chip package in which the chip is packaged inside the housing at the opening of the housing body near one side of the display module.
Further, the oil level monitoring module 110 further comprises a first communication connector 115 and a second communication connector 116 disposed in the housing,
one end of the first communication connector 115 is electrically connected to the pin outgoing line of the pressure sensor chip 111, and the other end of the first communication connector is electrically connected to the power line of the display module 120;
one end of the second communication connector 116 is electrically connected to the pin outgoing line of the temperature sensor chip 112, and the other end is electrically connected to the power line of the display module 120.
In practical application, the pin outgoing line of the chip (i.e. the pressure sensor chip and the temperature sensor chip) can be directly led out and then connected to the display module, but signal transmission is realized based on the mode, and the chip is easily damaged in the dismounting process.
Further, the intelligent oil level gauge 100 further includes:
a support rod 140 having both ends connected to the oil level monitoring module 110 and the display module 120, respectively;
the supporting rod has a second hollow cavity for placing cables connecting the oil level monitoring module 110 and the display module 120.
Specifically, by providing the supporting rod, the supporting and fixing functions of the oil level monitoring module and the display module are achieved, wherein the supporting rod is provided as a hollow cavity, so as to facilitate the line connection between the display module and the oil level monitoring module, in some embodiments, the supporting rod may be provided as two parts, which are divided into a first supporting rod and a second supporting rod, wherein the first supporting rod is close to one side of the display module, the second supporting rod is close to one side of the oil level monitoring module, the first supporting rod is thicker and shorter than the second supporting rod, and the second supporting rod is relatively more slender, so that the oil level monitoring module can extend into the transformer oil conservator for a sufficient length.
Further, in this embodiment, the display module 120 is further provided with an outlet interface, so as to implement wired transmission of signals, for example, under a harsh wireless condition, when the display module receives signal data such as oil temperature and oil pressure transmitted by the oil level detection module, the signal data needs to be transmitted to other electrical devices, and the signal data can be transmitted to other electrical devices, such as a remote monitoring platform, through the outlet interface in a wired transmission manner.
Based on the same technical concept, the embodiment of the present disclosure also provides a transformer conservator 200, wherein the transformer conservator 200 comprises a conservator housing 210, a capsule 220 and the intelligent oil level gauge 100 at least partially inserted into the conservator housing 210.
It can be understood that the transformer oil is stored in the oil conservator shell, the intelligent oil level gauge arranged on the inner side of the oil conservator shell extends into the transformer oil conservator, the oil inside is monitored in real time, and the capsule is used for keeping the pressure of the oil in the oil conservator within a normal range, so that the details are omitted.
In one embodiment, the conservator housing 200 further comprises: and a second connecting member 230 disposed on the conservator housing and used for fixing the intelligent oil level gauge to the conservator housing.
Specifically, the second connecting member 230 of the first connecting member 130 is matched with the first connecting member 130 of the above-mentioned intelligent oil level indicator embodiment, and the details are not repeated here. To sum up, the intelligent oil level gauge and the transformer oil conservator provided by the embodiment of the disclosure are characterized in that the oil level monitoring module is arranged, wherein the oil level monitoring module comprises a pressure sensor and a temperature sensor which are integrated into a whole, the oil level monitoring module monitors oil temperature signals and oil pressure signals in the transformer oil conservator, the display module receives pressure signals and temperature signals transmitted by the oil level monitoring module, the pressure signals are converted into oil level signals, and oil level numerical values, pressure numerical values and temperature numerical values of the oil in the transformer oil conservator are displayed according to the oil level signals, the pressure signals and the temperature signals. The intelligent oil level gauge provided by the embodiment can acquire information such as oil pressure, oil temperature and oil level in the oil conservator in real time, and when the oil level of the oil conservator is monitored, the safety monitoring of the oil pressure and the oil temperature in the transformer oil conservator is realized.
Finally, it should be noted that: the above embodiments are only used for illustrating the technical solutions of the present disclosure, and not for limiting the same; while the present disclosure has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art will understand that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present disclosure.
Claims (9)
1. An intelligent oil level indicator, comprising:
the oil level monitoring module comprises a pressure sensor and a temperature sensor which are integrated into a whole, the pressure sensor is used for collecting pressure signals of oil in the transformer oil conservator, and the temperature sensor is used for collecting temperature signals of the oil in the transformer oil conservator; and the number of the first and second groups,
and the display module is electrically connected with the oil level monitoring module and is used for receiving the pressure signal and the temperature signal output by the oil level monitoring module, converting the pressure signal into an oil level signal and displaying an oil level value, a pressure value and a temperature value of oil in the oil conservator of the transformer according to the oil level signal, the pressure signal and the temperature signal.
2. The intelligent oil level indicator of claim 1, further comprising:
the first connecting piece, first connecting piece set up in oil level monitoring module with between the display module, it is used for connecting the two and is fixed in on the transformer oil conservator, and oil level monitoring module is located inside the transformer oil conservator, the display module is located the transformer oil conservator is outside.
3. The intelligent oil level indicator of claim 1, wherein the integrated pressure and temperature sensor comprises: the temperature sensor comprises a shell, a pressure sensor chip, a temperature sensor chip and a chip packaging body used for packaging the pressure sensor chip and the temperature sensor chip in the shell.
4. The intelligent oil level indicator of claim 3, wherein the housing comprises: a housing body, a cover body and a first fixing part,
the shell body is provided with a first hollow cavity, two sides of the first hollow cavity are opened, the first hollow cavity is used for placing the pressure sensor chip, the temperature sensor chip and the chip packaging body,
the cover body is arranged at an opening of the shell body, which is far away from one side of the display module;
the first fixing part is arranged at an opening of the shell body close to one side of the display module.
5. The intelligent oil level indicator of claim 4, wherein the chip package comprises: the packaging body comprises a packaging body and a second fixing part which is arranged on the packaging body and matched with the first fixing part.
6. The intelligent oil level indicator of claim 3, wherein said oil level monitoring module further comprises first and second communication connectors disposed within said housing,
one end of the first communication joint is electrically connected with a pin outgoing line of the pressure sensor chip, and the other end of the first communication joint is electrically connected with a power line of the display module;
one end of the second communication joint is electrically connected with the pin outgoing line of the temperature sensor chip, and the other end of the second communication joint is electrically connected with the power line of the display module.
7. The intelligent oil level indicator of claim 1, further comprising:
the two ends of the supporting rod are respectively connected with the oil level monitoring module and the display module;
the supporting rod is provided with a second hollow cavity, and the second hollow cavity is used for placing and connecting the oil level monitoring module and a cable of the display module.
8. A transformer conservator, comprising: -a conservator housing, and-an intelligent oil level gauge as claimed in any one of claims 1-7 inserted at least partially inside the conservator housing.
9. The transformer conservator of claim 8, further comprising: set up in on the oil conservator casing and be used for with intelligence oil level gaugember is fixed in second connecting piece on the oil conservator casing.
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| CN202021100126.3U CN212645769U (en) | 2020-06-15 | 2020-06-15 | Intelligent oil level gauge and transformer oil conservator |
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| CN202021100126.3U CN212645769U (en) | 2020-06-15 | 2020-06-15 | Intelligent oil level gauge and transformer oil conservator |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113658784A (en) * | 2021-08-09 | 2021-11-16 | 南京力通达电气技术有限公司 | Intelligent oil level abnormity monitoring device and monitoring method for transformer |
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2020
- 2020-06-15 CN CN202021100126.3U patent/CN212645769U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113658784A (en) * | 2021-08-09 | 2021-11-16 | 南京力通达电气技术有限公司 | Intelligent oil level abnormity monitoring device and monitoring method for transformer |
| CN113658784B (en) * | 2021-08-09 | 2023-09-22 | 南京力通达电气技术有限公司 | Intelligent oil level abnormality monitoring device and monitoring method for transformer |
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