CN216385892U - Digital detection device of power transformer oil level and power transformer - Google Patents
Digital detection device of power transformer oil level and power transformer Download PDFInfo
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- CN216385892U CN216385892U CN202122797980.0U CN202122797980U CN216385892U CN 216385892 U CN216385892 U CN 216385892U CN 202122797980 U CN202122797980 U CN 202122797980U CN 216385892 U CN216385892 U CN 216385892U
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Abstract
The utility model discloses a digital detection device for the oil level of a power transformer and the power transformer, the digital detection device for the oil level of the power transformer comprises a signal acquisition and measurement module and a signal processing remote transmission module, the signal acquisition and measurement module comprises a connector which is connected with an oil discharge port of an oil storage cabinet of the power transformer, the connector is hollow, one end of the connector is a connecting flange which is connected with an oil discharge pipe of the oil storage cabinet of the power transformer, the other end of the connector is closed or provided with an oil discharge valve, at least two pressure sensors which are arranged at intervals are arranged in the connector, and the output ends of the pressure sensors are connected with the signal processing remote transmission module. The oil level monitoring system can realize oil level monitoring by utilizing a pressure intensity detection principle and the double pressure sensors, has the advantage of high detection accuracy, can transmit an oil level signal to a background and a monitoring platform in a station in real time, and meets the management requirement of an intelligent transformer substation.
Description
Technical Field
The utility model relates to oil level detection equipment of a power transformer, in particular to a digital oil level detection device of the power transformer and the power transformer.
Background
The power transformer is a core device of a power grid system, and safe and stable operation of the power transformer is a necessary condition for reliable power supply of the power grid system. The oil level is one of important parameters for representing whether the transformer can safely and stably operate, the risk of oil shortage of the transformer can be caused when the oil level is too low, and oil injection accidents of the transformer can be caused when the oil level is too high, so that the oil level detection method has important significance for accurately detecting the oil level of the transformer. At present, the oil level detection of the transformer in China mainly adopts a pointer type oil level indicator and a tubular type oil level indicator, but the oil level detection has the following problems: firstly, the two oil level meters are respectively detected by utilizing the principles of mechanical transmission and a communicating vessel, the phenomenon of 'false oil level' can be caused when a mechanism is jammed or the oil level meters leak oil, and the accurate reading of operation and maintenance personnel can be influenced by the over rough scale of a pointer type dial plate and oil sludge generated by the fact that insulating oil in a pipe is irradiated by sunlight for a long time; and secondly, the two oil level gauges can only read detection results on site, do not have a remote transmission function, cannot perform real-time monitoring and active early warning, and can bring potential safety hazards to operation and maintenance personnel who read abnormal oil levels of the transformer on site.
SUMMERY OF THE UTILITY MODEL
The technical problems to be solved by the utility model are as follows: aiming at the problems in the prior art, the utility model provides a digital detection device for the oil level of a power transformer and the power transformer, which can realize oil level monitoring by using a pressure intensity detection principle and double pressure sensors, have the advantage of high detection accuracy, integrate signal acquisition and measurement with signal remote transmission, and can transmit an oil level signal to a background and a monitoring platform in a station in real time so as to meet the management requirement of an intelligent transformer station.
In order to solve the technical problems, the utility model adopts the technical scheme that:
the utility model provides a digital detection device of power transformer oil level, includes signal acquisition measurement module and signal processing teletransmission module, signal acquisition measurement module is including being used for the connector that links to each other with power transformer's oil storage cabinet oil discharge outlet, the inside cavity of connector and one end are sealed or are equipped with the fuel outlet valve for being used for flange, the other end that link to each other with power transformer's oil storage cabinet oil drain pipe, inside two at least pressure sensor that are equipped with the interval and arrange of connector, pressure sensor's output links to each other with signal processing teletransmission module.
Optionally, a transparent observation window for observing the internal condition is arranged in the middle of the connector.
Optionally, the connector seals or is equipped with the one end of fuel outlet valve and is equipped with electric connection terminal, pressure sensor's output passes through electric connection terminal and signal processing teletransmission module and links to each other.
Optionally, the at least two pressure sensors are different in height in the vertical direction, and the height difference h between the two pressure sensors (12) in the vertical direction3Satisfies rho gh3Not less than 2A alpha, where rho is transformation pressureThe density of the oil, g is the gravity acceleration, A is the limit range of the pressure sensor (12), and alpha is the precision of the pressure sensor (12).
Optionally, the system further comprises a power supply, and an output end of the power supply is connected with power ends of the signal acquisition and measurement module and the signal processing remote transmission module respectively.
Optionally, the power supply includes a power module and a switch circuit, and an output end of the power module is connected to power ends of the signal acquisition and measurement module and the signal processing remote transmission module through the switch circuit respectively.
Optionally, the switching circuit is a time-switch circuit.
Optionally, the power module is a battery module.
Optionally, the connecting flange is a threaded connecting flange, and a sealing ring is sleeved on the threaded connecting flange.
In addition, the utility model also provides a power transformer which comprises a transformer body with a transformer body oil tank and an oil storage cabinet, wherein the oil drain pipe of the oil storage cabinet is connected with the digital detection device for the oil level of the power transformer.
Compared with the prior art, the utility model has the following advantages:
1. the signal acquisition and measurement module comprises a connector which is connected with an oil discharge port of an oil conservator of a power transformer, at least two pressure sensors which are arranged at intervals are arranged inside the connector, oil level monitoring can be realized by using a pressure intensity detection principle and double pressure sensors, and the signal acquisition and measurement module has the advantage of high detection accuracy.
2. The oil level monitoring system comprises a signal acquisition and measurement module and a signal processing remote transmission module, integrates signal acquisition and measurement and signal remote transmission, can transmit an oil level signal to a background and a monitoring platform in a station in real time for fitting an oil temperature-oil level curve, can be used for actively alarming an abnormal oil level signal, and meets the management requirement of an intelligent transformer substation.
3. The signal acquisition and measurement module comprises a connector which is used for being connected with an oil discharge port of an oil storage cabinet of a power transformer, wherein the connector is hollow inside, one end of the connector is a connecting flange which is used for being connected with an oil discharge pipe of the oil storage cabinet of the power transformer, and the other end of the connector is closed or provided with an oil discharge valve.
4. All the sensors and the module units are arranged outside the transformer, so that the change of the internal structure and the performance of the transformer is avoided, and the accurate measurement, the processing calculation and the remote output of the oil level parameters can be completed on the basis of fully ensuring the original characteristics of the transformer.
Drawings
Fig. 1 is a schematic structural diagram of an embodiment of the present invention.
Illustration of the drawings: 1. a signal acquisition and measurement module; 11. a connector; 12. a pressure sensor; 13. a transparent viewing window; 2. the signal processing remote transmission module; 3. and (4) a power supply.
Detailed Description
The first embodiment is as follows:
as shown in fig. 1, the digital detection device of power transformer oil level of this embodiment includes signal acquisition measurement module 1 and signal processing teletransmission module 2, signal acquisition measurement module 1 is including being used for the connector 11 that links to each other with power transformer's oil storage cabinet oil discharge outlet, the inside cavity of connector 11 and one end are for being used for the flange that links to each other with power transformer's oil storage cabinet oil discharge pipe, the other end seals, connector 11 inside is equipped with two at least pressure sensor 12 of interval arrangement, pressure sensor 12's output links to each other with signal processing teletransmission module 2. The digital detection device connector 11 of power transformer oil level of this embodiment is inside to be equipped with two at least pressure sensor 12 that the interval was arranged, and usable pressure intensity detects principle and two pressure sensor 12 and realize the oil level monitoring, has the advantage that detection accuracy is high. All the sensors and the module units are arranged outside the transformer, so that the change of the internal structure and the performance of the transformer is avoided, and the accurate measurement, the processing calculation and the remote output of the oil level parameters can be completed on the basis of fully ensuring the original characteristics of the transformer.
The signal acquisition and measurement module 1 of this embodiment is including being used for the connector that links to each other with power transformer's oil conservator oil discharge opening, and the inside cavity of connector and one end are sealed for flange, the other end that is used for linking to each other with power transformer's oil conservator oil discharge pipe, can conveniently integrate with current power transformer. In this embodiment, the connector 11 is made of stainless steel.
In this embodiment, the pressure sensor 12 has a limit absolute pressure value of-100 kPa to 200kPa, a working temperature range of-20 ℃ to 160 ℃, and a precision of 0.2%.
As shown in fig. 1, the middle part of the connector 11 in this embodiment is provided with a transparent observation window 13 for observing the internal conditions, so that the oil inlet state in the inner cavity of the connector 11 can be conveniently observed.
In this embodiment, an electrical connection terminal is disposed at the end of the connector 11 that is closed or provided with the oil drain valve, and the output end of the pressure sensor 12 is connected to the signal processing remote transmission module 2 through the electrical connection terminal.
As shown in fig. 1, in the present embodiment, at least two pressure sensors 12 are different in height from each other in the vertical direction, and the difference h between the heights of the two pressure sensors 12 in the vertical direction3Satisfies rho gh3And the alpha is more than or equal to 2A alpha, wherein rho is the density of the transformer oil, g is the gravity acceleration, A is the limit range of the pressure sensor 12, and alpha is the precision of the pressure sensor 12. The height difference h of the two pressure sensors (12) along the vertical direction3The following factors are considered for selection: firstly, the pressure difference between the two sensors is larger than the positive and negative deviation range of the sensors, namely if the limit range of the sensors is A, the precision is alpha; and secondly, the two sensors cannot be positioned at different oil temperatures to cause the difference of the insulating oil density. Height difference h in the present embodiment3The value is 30 cm.
Two pressure sensors 12 are arranged in the vertical direction, and the height difference h between the two pressure sensors 123Height difference h between two pressure sensors 123The pressure difference between the two positions can be ensured to be reflected within the precision range of the sensor, and the difference of the insulating oil density caused by the overlarge oil temperature difference between the two positions of the pressure sensor 12 is avoidedAnd (3) distinguishing.
In this embodiment, the signal acquisition and measurement module 1 and the signal processing and remote transmission module 2 are two independent functional modules and are connected through a shielded cable with armor. The signal acquisition and measurement module 1 and the signal processing and remote transmission module 2 may be of a split structure, or may be of an integrated structure as required.
In this embodiment, the remote monitoring device further comprises a power supply 3, and an output end of the power supply 3 is connected with power ends of the signal acquisition and measurement module 1 and the signal processing remote transmission module 2 respectively.
In this embodiment, the power supply 3 includes a power module and a switch circuit, and the output end of the power module is connected to the power ends of the signal acquisition and measurement module 1 and the signal processing remote transmission module 2 through the switch circuit respectively.
In this embodiment, the power module is a battery module, so that it is not necessary to additionally connect a power source from the station, which is beneficial to construction and improves the safety of the system. Specifically, the power module in this embodiment uses an AC220V/5A built-in battery. It is needless to say that the voltage and current specifications required by the signal acquisition and measurement module 1 and the signal processing remote transmission module 2 may be the same or different, the voltage and current specifications required by the power supply module may be customized according to the actual requirements of the signal acquisition and measurement module 1 and the signal processing remote transmission module 2, and in addition, under the condition that the voltage and current specifications required by the signal acquisition and measurement module 1 and the signal processing remote transmission module 2 are different, a conversion circuit may be adopted to achieve the multi-output goal.
In this embodiment, the data remote transmission of the signal processing remote transmission module 2 is performed in a wireless transmission mode.
Considering that the oil level parameter of the transformer is not a sudden change and does not need to be monitored, the switching circuit in the embodiment is further a timing switching circuit, for example, the switching circuit can be awakened once every 12 hours as required to realize the oil level detection of the transformer twice a day, so that the frequency requirement of the oil level detection can be ensured, and the service life of the battery can be prolonged. The timing switch circuit is an existing functional circuit, and may be implemented by, for example, a timer and a switch circuit triggered by the timer (hardware timing is implemented by the timer), or may be implemented by a controller and a switch circuit controlled by the controller (software timing is implemented by the controller).
In this embodiment, the connection flange is a screw connection flange (not shown in the figure), and a sealing ring (not shown in the figure) is sleeved on the screw connection flange, so that the reliability of connection with an oil drain pipe of an oil storage cabinet can be ensured, and the oil leakage phenomenon can be prevented.
The oil level monitoring system comprises a signal acquisition and measurement module 1 and a signal processing and remote transmission module 2, integrates signal acquisition and measurement and signal remote transmission, can transmit an oil level signal to a background and a monitoring platform in a station in real time so as to fit an oil temperature-oil level curve, can be used for actively alarming an abnormal oil level signal, and meets the management requirement of an intelligent transformer substation. After the detection pressure signal is transmitted to the in-station background and the monitoring platform in real time, the in-station background and the monitoring platform can realize liquid level detection.
It should be noted that the digital detection device for the oil level of the power transformer of the present embodiment does not depend on a specific liquid level detection method. For example, the liquid level height of a single point may be calculated according to a liquid pressure calculation formula, which is:
P1＝ρ1gh1，P2＝ρ2gh2
wherein, P1And P2The oil level pressures at pressure sensor No. 1 (upper pressure sensor 12) and pressure sensor No. 2 (lower pressure sensor 12), respectively, ρ1And ρ2The density of the insulating oil at the pressure sensor No. 1 (upper pressure sensor 12) and the pressure sensor No. 2 (lower pressure sensor 12), g is the acceleration of gravity, h1And h2The liquid level heights at the pressure sensor No. 1 (the upper pressure sensor 12) and the pressure sensor No. 2 (the lower pressure sensor 12), respectively. Alternatively, on the basis of the foregoing liquid pressure calculation formula, it is assumed that the insulating oil densities at the positions of the two pressure sensors 12 are regarded as being identical, i.e., ρ1＝ρ2Then the height h can be calculated1The calculation expression of (a) is:
h1＝P1h3/(P2-P1)
wherein h is3Is the height difference between the pressure sensor No. 1 (the upper pressure sensor 12) and the pressure sensor No. 2 (the lower pressure sensor 12). Due to the height h1The function expression of (2) does not contain a density parameter, so that the influence of temperature on the calculation of the density and the oil level of the insulating oil is eliminated, and no additional compensation calculation (temperature compensation) is needed. In addition, other similar methods, such as a method of measuring the liquid level in the fermenter using a dual pressure sensor disclosed in chinese patent application No. 201910563186.4, may be used as needed. In summary, the digital detection device for the oil level of the power transformer of the present embodiment does not depend on a specific liquid level detection method.
In addition, this embodiment still provides a power transformer, including the transformer body that has transformer body oil tank and oil storage tank, is connected with the digital detection device of aforementioned power transformer oil level on the oil storage tank oil drain pipe of oil storage tank.
Example two:
the present embodiment is basically the same as the first embodiment, and the main differences are as follows: the digital detection device for the oil level of the power transformer does not comprise the power supply 3, but utilizes the existing weak current system of the transformer substation for power supply, and can also ensure the normal work of the signal acquisition and measurement module 1 and the signal processing remote transmission module 2.
Example three:
the present embodiment is basically the same as the first embodiment, and the main differences are as follows: the other end of the connector 11 in this embodiment is provided with an oil drain valve, which does not affect the oil drain function of the oil drain pipe of the oil storage cabinet.
Example four:
the present embodiment is basically the same as the first embodiment, and the main differences are as follows: at least two pressure sensors 12 are arranged obliquely in this embodiment, but still have different heights in the vertical direction, and the difference h in height between the two pressure sensors 123Likewise, the height difference h between the two pressure sensors 12 can also be used3Can ensure twoThe pressure difference of the positions can be reflected in the accuracy range of the sensors, and the two pressure sensors 12 are not different in insulating oil density due to overlarge oil temperature difference.
The above description is only a preferred embodiment of the present invention, and the protection scope of the present invention is not limited to the above embodiments, and all technical solutions belonging to the idea of the present invention belong to the protection scope of the present invention. It should be noted that modifications and embellishments within the scope of the utility model may occur to those skilled in the art without departing from the principle of the utility model, and are considered to be within the scope of the utility model.
Claims (10)
1. The utility model provides a digital detection device of power transformer oil level, a serial communication port, including signal acquisition measurement module (1) and signal processing teletransmission module (2), signal acquisition measurement module (1) is including being used for connector (11) that link to each other with power transformer's oil storage cabinet oil discharge outlet, connector (11) inside cavity and one end are sealed or are equipped with the fuel outlet valve for being used for flange, the other end that link to each other with power transformer's oil storage cabinet oil discharge pipe, connector (11) inside is equipped with two at least pressure sensor (12) of interval arrangement, the output of pressure sensor (12) links to each other with signal processing teletransmission module (2).
2. Digital detection device of the power transformer oil level according to claim 1, characterized in that the connector (11) is provided with a transparent viewing window (13) in the middle for viewing the internal conditions.
3. The digital detection device for the oil level of the power transformer according to claim 2, characterized in that the end of the connector (11) closed or provided with the oil drain valve is provided with an electric connection terminal, and the output end of the pressure sensor (12) is connected with the signal processing remote transmission module (2) through the electric connection terminal.
4. Digital detection device for the oil level in power transformers according to claim 3, characterized in thatCharacterized in that the heights of the at least two pressure sensors (12) in the vertical direction are different from each other, and the height difference h between the two pressure sensors (12) in the vertical direction3Satisfies rho gh3And the alpha is more than or equal to 2A alpha, wherein rho is the density of the transformer oil, g is the gravity acceleration, A is the limit measuring range of the pressure sensor (12), and alpha is the precision of the pressure sensor (12).
5. The digital oil level detection device of the power transformer according to claim 4, characterized by further comprising a power supply (3), wherein the output end of the power supply (3) is respectively connected with the power ends of the signal acquisition and measurement module (1) and the signal processing and remote transmission module (2).
6. The digital oil level detection device for the power transformer according to claim 5, wherein the power supply (3) comprises a power module and a switch circuit, and the output end of the power module is respectively connected with the power ends of the signal acquisition and measurement module (1) and the signal processing and remote transmission module (2) through the switch circuit.
7. The digital detection device for the oil level of the power transformer of claim 6, wherein the switch circuit is a timing switch circuit.
8. The digital detection device for the oil level of the power transformer of claim 6, wherein the power module is a battery module.
9. The digital detection device for the oil level of the power transformer as recited in claim 8, wherein said connecting flange is a threaded connecting flange, and a sealing ring is sleeved on the threaded connecting flange.
10. A power transformer comprises a transformer body with a transformer body oil tank and an oil conservator, and is characterized in that an oil drain pipe of the oil conservator is connected with a digital detection device for the oil level of the power transformer as claimed in any one of claims 1 to 9.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122797980.0U CN216385892U (en) | 2021-11-15 | 2021-11-15 | Digital detection device of power transformer oil level and power transformer |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202122797980.0U CN216385892U (en) | 2021-11-15 | 2021-11-15 | Digital detection device of power transformer oil level and power transformer |
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| CN216385892U true CN216385892U (en) | 2022-04-26 |
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| CN202122797980.0U Active CN216385892U (en) | 2021-11-15 | 2021-11-15 | Digital detection device of power transformer oil level and power transformer |
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- 2021-11-15 CN CN202122797980.0U patent/CN216385892U/en active Active
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