CN215177919U - Transformer vibration state monitoring device - Google Patents
Transformer vibration state monitoring device Download PDFInfo
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- CN215177919U CN215177919U CN202122705165.7U CN202122705165U CN215177919U CN 215177919 U CN215177919 U CN 215177919U CN 202122705165 U CN202122705165 U CN 202122705165U CN 215177919 U CN215177919 U CN 215177919U
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Abstract
The utility model discloses a transformer vibration state monitoring devices, include: the device comprises a vibration acceleration sensor, a current sensor, a voltage sensor, a temperature sensor, a data acquisition card, a trigger module, a signal extraction module and a data storage module; the method comprises the steps that vibration signals of a transformer are collected through a vibration acceleration sensor, load current of windings on all sides of the transformer and current of a neutral point of the transformer are collected through a current sensor, and voltage of the windings on all sides of the transformer is collected through a voltage sensor; acquiring the top oil temperature of the transformer through a temperature sensor; the data of the stored current, voltage, temperature and vibration signals are triggered through the trigger module, and the transient vibration signal trigger function is achieved.
Description
Technical Field
The utility model relates to an electric power tech field especially relates to a transformer vibration state monitoring devices.
Background
In recent years, vibration monitoring technology is increasingly applied to evaluation and diagnosis of mechanical states of transformers, and related evaluation methods, monitoring devices and the like are proposed and developed successively. However, research finds that the conventional transformer vibration state monitoring device mainly performs sampling monitoring at certain time intervals, and the method has the defects that transient working conditions (such as external short-circuit current impact, overload, overexcitation, no-load switching-on and the like) in the operation of the transformer cannot be quickly responded, and vibration signals at the transient time are captured. Secondly, the existing transformer vibration monitoring devices do not monitor the transformer oil temperature, the transformer oil temperature plays a key role in the transmission of vibration energy, and the synchronous acquisition of the oil temperature is helpful for analyzing and evaluating the vibration state of the transformer.
SUMMERY OF THE UTILITY MODEL
The embodiment of the utility model provides a transformer vibration state monitoring devices provides one kind and possesses transient state vibration signal trigger function and gets transformer vibration state monitoring devices.
An embodiment of the utility model provides a transformer vibration state monitoring devices, the device includes: the device comprises a vibration acceleration sensor, a current sensor, a voltage sensor, a temperature sensor, a data acquisition card, a trigger module, a signal extraction module and a data storage module;
the vibration acceleration sensor is adsorbed on the wall of the transformer box through a magnetic suction seat;
the current sensor is connected in series between the load current of each side winding of the transformer and the neutral point of the transformer;
the voltage sensor is connected in parallel between windings on each side of the transformer;
the temperature sensor is tightly attached to the top of the transformer;
the vibration acceleration sensor, the current sensor, the voltage sensor and the temperature sensor are all connected with the data acquisition card, the data acquisition card is connected with the signal extraction module, and the signal extraction module is connected with the data storage module through the trigger module.
As a preferable mode, the signal extraction module includes: the device comprises a vibration signal extraction submodule, a voltage spectrum characteristic extraction submodule, a temperature extraction submodule and a current spectrum characteristic extraction submodule;
the voltage frequency spectrum characteristic extraction submodule performs Fourier transform on the acquired voltage signal to obtain the amplitude-frequency distribution of the voltage signal;
the current frequency spectrum characteristic extraction submodule performs Fourier transform on the acquired current signal to obtain the amplitude-frequency distribution of the current signal;
the temperature extraction submodule converts the acquired temperature signal into a voltage signal;
and the vibration signal extraction submodule converts the acquired vibration signal into a voltage signal and acquires frequency characteristics.
Preferably, the signal extraction module is connected to the data storage module through the trigger module, specifically:
the vibration signal extraction submodule of the signal extraction module is connected with the data storage module through the trigger module; the current sensor, the voltage sensor and the temperature sensor are all directly connected with the data storage module.
Preferably, the device comprises a plurality of data acquisition cards, and the plurality of data acquisition cards are in expanding connection in a cascading mode through Ethernet or a wireless local area network;
the data acquisition card is in communication connection with the host through the Ethernet or the wireless local area network.
As a preferred scheme, the plurality of data acquisition cards comprise a first acquisition card, a second acquisition card and a third acquisition card;
the first acquisition card is in communication connection with the host through an Ethernet or a local area network;
the second acquisition card is in communication connection with the first acquisition card through an Ethernet or a local area network;
and the third acquisition card is in communication connection with the second acquisition card through an Ethernet or a local area network.
As a parallel scheme, the plurality of data acquisition cards comprise a first acquisition card, a second acquisition card, a third acquisition card, a fourth acquisition card and a fifth acquisition card;
the first acquisition card, the fourth acquisition card and the fifth acquisition card are in communication connection with the host through an Ethernet or a local area network;
the second acquisition card is in communication connection with the first acquisition card through an Ethernet or a local area network;
and the third acquisition card is in communication connection with the second acquisition card through an Ethernet or a local area network.
The utility model discloses a transformer vibration state monitoring devices, include: the device comprises a vibration acceleration sensor, a current sensor, a voltage sensor, a temperature sensor, a data acquisition card, a trigger module, a signal extraction module and a data storage module; the method comprises the steps that vibration signals of a transformer are collected through a vibration acceleration sensor, load current of windings on all sides of the transformer and current of a neutral point of the transformer are collected through a current sensor, and voltage of the windings on all sides of the transformer is collected through a voltage sensor; acquiring the top oil temperature of the transformer through a temperature sensor; the data of the stored current, voltage, temperature and vibration signals are triggered through the trigger module, and the transient vibration signal trigger function is achieved.
Drawings
Fig. 1 is a schematic structural diagram of a device for monitoring a vibration state of a transformer according to an embodiment of the present invention;
fig. 2 is a schematic diagram of an extended cascade structure of a data acquisition card according to an embodiment of the present invention, a) is a schematic diagram of a cascade mode 1; b) is a schematic structural diagram of the cascade system 2.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.
Referring to fig. 1, which is a schematic structural diagram of a transformer vibration state monitoring device provided in an embodiment of the present invention, the device includes a vibration acceleration sensor, a current sensor, a voltage sensor, a temperature sensor, a data acquisition card, and a signal extraction module;
the vibration acceleration sensor is adsorbed on the wall of the transformer box through a magnetic suction seat;
the current sensor is connected in series between the load current of each side winding of the transformer and the neutral point of the transformer;
the voltage sensor is connected in parallel between windings on each side of the transformer;
the temperature sensor is tightly attached to the top of the transformer;
the vibration acceleration sensor, the current sensor, the voltage sensor and the temperature sensor are all connected with the data acquisition card, and the data acquisition card is connected with the signal extraction module.
In the specific implementation of the embodiment, the vibration acceleration sensor is adsorbed on the wall of the transformer through the magnetic suction seat to acquire a transformer vibration signal; the current sensor is connected in series between the load current of each side winding of the transformer and the neutral point of the transformer and is used for collecting the load current of each side winding of the transformer and the current of the neutral point of the transformer; the voltage sensor is connected in parallel between the windings on the sides of the transformer and is used for collecting the voltage of the windings on the sides of the transformer; the temperature sensor is arranged at the upper part of the transformer and used for collecting the oil temperature of the top layer of the transformer.
The vibration acceleration sensor, the current sensor, the voltage sensor and the temperature sensor are all connected with the data acquisition card, the data acquisition card is connected with the signal extraction module, and the signal extraction module is connected with the data storage module through the trigger module.
Collecting signals of a vibration acceleration sensor, a current sensor, a voltage sensor and a temperature sensor through a data acquisition card, conditioning and amplifying the signals, switching measuring ranges, performing AD conversion and digitally filtering, transmitting the converted vibration data and voltage and current data to a signal extraction module, extracting current, voltage, temperature and vibration signals by the signal extraction module, converting the current, voltage, temperature and vibration signals into specific voltage amplitude values, and extracting corresponding frequency spectrum characteristics;
the signal extraction module is connected with the trigger module, the trigger module outputs a trigger signal to the data storage module through monitoring a signal of the signal extraction module when a trigger condition is met, and the data storage module stores data of current, voltage, temperature and vibration signals according to the trigger signal.
The embodiment of the utility model provides a pair of transformer vibration state monitoring devices, include: the device comprises a vibration acceleration sensor, a current sensor, a voltage sensor, a temperature sensor, a data acquisition card, a trigger module, a signal extraction module and a data storage module; the method comprises the steps that vibration signals of a transformer are collected through a vibration acceleration sensor, load current of windings on all sides of the transformer and current of a neutral point of the transformer are collected through a current sensor, and voltage of the windings on all sides of the transformer is collected through a voltage sensor; acquiring the top oil temperature of the transformer through a temperature sensor; the triggering module outputs a triggering signal to the data storage module through a signal of the monitoring signal extraction module when a triggering condition is met, and the data storage module stores data of current, voltage, temperature and a vibration signal according to the triggering signal and has a transient vibration signal triggering function.
In another embodiment of the present invention, the signal extraction module includes: the device comprises a vibration signal extraction submodule, a voltage spectrum characteristic extraction submodule, a temperature extraction submodule and a current spectrum characteristic extraction submodule;
the voltage frequency spectrum characteristic extraction submodule performs Fourier transform on the acquired voltage signal to obtain the amplitude-frequency distribution of the voltage signal;
the current frequency spectrum characteristic extraction submodule performs Fourier transform on the acquired current signal to obtain the amplitude-frequency distribution of the current signal;
the temperature extraction submodule converts the acquired temperature signal into a voltage signal;
the vibration signal extraction submodule converts the acquired vibration signal into a voltage signal and performs frequency calculation to obtain the frequency of the vibration signal;
the signal extraction module is connected with the data storage module through the trigger module, and specifically comprises:
the vibration signal extraction submodule of the signal extraction module is connected with the data storage module through the trigger module; the current sensor, the voltage sensor and the temperature sensor are all directly connected with the data storage module.
In this embodiment, the signal extracting module includes: the device comprises a vibration signal extraction submodule, a voltage spectrum characteristic extraction submodule, a temperature extraction submodule and a current spectrum characteristic extraction submodule;
and the voltage frequency spectrum characteristic extraction submodule performs Fourier transform on the acquired voltage signal to obtain the amplitude-frequency distribution of the voltage signal.
And the current frequency spectrum characteristic extraction submodule performs Fourier transform on the acquired current signal to obtain the amplitude-frequency distribution of the current signal.
The temperature extraction submodule converts the acquired temperature signal into a voltage signal;
and the vibration signal extraction submodule converts the acquired vibration signal into a voltage signal and acquires frequency characteristics.
Specifically, the method comprises the following steps: the vibration signal extraction submodule comprises a vibration main frequency algorithm, a frequency complexity algorithm, a vibration odd-even harmonic ratio algorithm, a vibration harmonic distortion algorithm, a 0-400Hz vibration accumulated power ratio algorithm, a 400-1000Hz vibration accumulated power ratio algorithm and a 1000-4000Hz vibration accumulated power ratio algorithm.
Complexity of frequency
Wherein f =50Hz, 100Hz, 150Hz, 200Hz … … 4000 Hz. P f The vibration power ratio distribution probability when the vibration frequency is f
；
Wherein E isfThe vibration power ratio when the vibration frequency is f is:
in the above formula, psdf is the vibration power at frequency f; psdtotalThe vibration total power is the vibration total power with the frequency of 0-4000 Hz; w is afIs a frequency correction factor. This is because the high frequency component contained in the vibration signal plays a very important role in the transformer fault diagnosis, and therefore w is introducedfThe purpose of (1) is to increase the specific gravity of the high-frequency vibration component. The vibration power spectrum psd may be calculated by multiplying the amplitude of the vibration signal by its autocorrelation function.
Where A (t) is the amplitude of the vibration signal at time t,
is the integral variable of the convolution.
Vibration odd-even harmonic ratio
；
Wherein f ism=50Hz、150Hz、250Hz、…；fn=100Hz, 200Hz, 300Hz, …; different from the frequency complexity, the proportion E of the vibration power is not needed when the odd-even harmonic ratio is calculatedfAnd performing frequency correction.
The vibration harmonic distortion rate calculation method is as follows:
taking 100Hz as the fundamental frequency of vibration, the harmonic distortion rate (VTHD) of vibration can be expressed as follows, where AfAs amplitude:
；
since the harmonic distortion rate of the converter transformer vibration is large, it is converted into a decibel measure, namely:
；
the calculation method of the ratio of the vibration accumulated power of 0-400Hz comprises the following steps:
；
the calculation method of the ratio of the 400-Hz 1000Hz vibration accumulated power comprises the following steps:
the calculation method of the ratio of the 1000-plus-2000 Hz vibration accumulated power comprises the following steps:
the calculation method of the ratio of 2000-4000Hz vibration accumulated power comprises the following steps:
therefore, the ratio of each vibration accumulated power is calculated, and the analysis process of the vibration signal is completed.
In another embodiment of the present invention, the signal extraction module is connected to the data storage module through the trigger module, specifically:
the vibration signal extraction submodule of the signal extraction module is connected with the data storage module through the trigger module; the current sensor, the voltage sensor and the temperature sensor are all directly connected with the data storage module.
When the embodiment is implemented specifically, the data storage module is connected with the vibration signal extraction submodule through the trigger module, and when the trigger acquisition condition is met, the trigger data storage module stores the voltage, the current, the temperature and the vibration signals which are automatically acquired by the current sensor, the voltage sensor and the temperature sensor and are automatically stored for a period of time before and after the trigger time according to the setting.
The trigger acquisition condition may be set as: calculating and acquiring the maximum value Vmax of the signal acquired by each vibration sensor in a period of 20 ms; further, calculating increment delta Vmax of the maximum value of the vibration signal of two adjacent periods; when the delta Vmax of all the vibration acceleration sensors exceeds a threshold delta, judging that the transformer is subjected to an abnormal operation condition; and collecting the vibration signal, the voltage signal and the current signal at the time T1 before the reference point and the time T2 after the reference point by taking the time corresponding to the maximum value of the vibration signal in the period as the reference point, and storing the vibration signal, the voltage signal and the current signal in a data storage module.
In another embodiment provided by the present invention, the apparatus comprises a plurality of data acquisition cards, the plurality of data acquisition cards are connected in a cascade manner through an ethernet or a wireless lan;
the data acquisition card is in communication connection with the host through the Ethernet or the wireless local area network.
In this embodiment, the data acquisition card may be a cascade-connected data acquisition card, and a data acquisition host does not need to be configured independently for each data acquisition card, thereby reducing the cost.
In yet another embodiment provided by the present invention, the plurality of data acquisition cards includes a first acquisition card, a second acquisition card and a third acquisition card;
the first acquisition card is in communication connection with the host through an Ethernet or a local area network;
the second acquisition card is in communication connection with the first acquisition card through an Ethernet or a local area network;
and the third acquisition card is in communication connection with the second acquisition card through an Ethernet or a local area network.
As a parallel scheme of the above scheme, the plurality of data acquisition cards include a first acquisition card, a second acquisition card, a third acquisition card, a fourth acquisition card and a fifth acquisition card;
the first acquisition card, the fourth acquisition card and the fifth acquisition card are in communication connection with the host through an Ethernet or a local area network;
the second acquisition card is in communication connection with the first acquisition card through an Ethernet or a local area network;
and the third acquisition card is in communication connection with the second acquisition card through an Ethernet or a local area network.
In the specific implementation of this embodiment, refer to fig. 2, which is a schematic diagram of an extended cascade structure of a data acquisition card provided in the embodiment of the present invention, a) is a schematic diagram of a cascade mode 1; b) is a structural schematic diagram of a cascade mode 2;
fig. 2 a) is an implementation manner of the expansion cascade of the data acquisition card of the present invention, which comprises: the system comprises a vibration state monitoring host, an acquisition card 1, an acquisition card 2 and an acquisition card 3. The vibration state monitoring host and each acquisition card are respectively connected through Ethernet or WLAN. The acquisition card 1 can directly realize communication with the host computer through Ethernet or wireless local area network WLAN. The acquisition cards 2 and 3 and the acquisition card cascaded at the back can realize communication with a host through the relay of the acquisition card at the previous stage, the vibration state monitoring host is connected with a workstation and a PC (personal computer), and data is transmitted to a cloud or a server through 5G, general packet radio service GPRS (general packet radio service) or Ethernet.
B) in fig. 2 is another implementation manner of the extended cascade of the data acquisition card of the present invention. Comprises the following steps: the system comprises a vibration state monitoring host, a gateway, an acquisition card 1, an acquisition card 2, an acquisition card 3, an acquisition card 4 and an acquisition card 5. The vibration state monitoring host, each acquisition card and the gateway are respectively connected through Ethernet or WLAN; the vibration state monitoring host and the acquisition cards 1, 4 and 5 can be directly connected with the gateway through Ethernet or WLAN, so as to realize the communication between the acquisition cards and the host. The acquisition cards 2 and 3 and the acquisition card cascaded behind need to realize communication with a host through the relay of the acquisition card of the previous stage; the gateway is arranged between the device host and the data acquisition card. The data acquisition card sends acquired data to the host through the gateway. The host sends a control command through the gateway.
The vibration state monitoring host and the acquisition card can be directly expanded in an Ethernet (Ethernet) or Wireless Local Area Network (WLAN) cascade connection mode, and can also be expanded in a gateway cascade connection mode, so that distributed data acquisition is realized, and distortion caused by interference of signals in the transmission process is avoided.
In the implementation example of the device, each acquisition card is connected with a plurality of sensors and is distributed at different positions of the transformer or on different transformers, and various signals of the transformer are acquired through the sensors. The collected signals are transmitted to the host through the Ethernet or the wireless local area network, the host is responsible for extracting various characteristic quantities of the signals and transmitting the characteristic quantities to the server, and the workstation or the PC can be directly connected with the host or acquire data from the cloud server.
The utility model provides a pair of transformer vibration state monitoring devices, include: the device comprises a vibration acceleration sensor, a current sensor, a voltage sensor, a temperature sensor, a data acquisition card, a trigger module, a signal extraction module and a data storage module; the method comprises the steps that vibration signals of a transformer are collected through a vibration acceleration sensor, load current of windings on all sides of the transformer and current of a neutral point of the transformer are collected through a current sensor, and voltage of the windings on all sides of the transformer is collected through a voltage sensor; acquiring the top oil temperature of the transformer through a temperature sensor; the triggering module outputs a triggering signal to the data storage module through a signal of the monitoring signal extraction module when a triggering condition is met, and the data storage module stores data of current, voltage, temperature and a vibration signal according to the triggering signal and has a transient vibration signal triggering function.
The foregoing is a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, a plurality of improvements and decorations can be made without departing from the principle of the present invention, and these improvements and decorations are also considered as the protection scope of the present invention.
Claims (6)
1. A transformer vibration condition monitoring apparatus, the apparatus comprising: the device comprises a vibration acceleration sensor, a current sensor, a voltage sensor, a temperature sensor, a data acquisition card, a trigger module, a signal extraction module and a data storage module;
the vibration acceleration sensor is adsorbed on the wall of the transformer box through a magnetic suction seat;
the current sensor is connected in series between the load current of each side winding of the transformer and the neutral point of the transformer;
the voltage sensor is connected in parallel between windings on each side of the transformer;
the temperature sensor is tightly attached to the top of the transformer;
the vibration acceleration sensor, the current sensor, the voltage sensor and the temperature sensor are all connected with the data acquisition card, the data acquisition card is connected with the signal extraction module, and the signal extraction module is connected with the data storage module through the trigger module.
2. The transformer vibration condition monitoring device according to claim 1, wherein the signal extraction module comprises: the device comprises a vibration signal extraction submodule, a voltage spectrum characteristic extraction submodule, a temperature extraction submodule and a current spectrum characteristic extraction submodule;
the voltage frequency spectrum characteristic extraction submodule performs Fourier transform on the acquired voltage signal to obtain the amplitude-frequency distribution of the voltage signal;
the current frequency spectrum characteristic extraction submodule performs Fourier transform on the acquired current signal to obtain the amplitude-frequency distribution of the current signal;
the temperature extraction submodule converts the acquired temperature signal into a voltage signal;
and the vibration signal extraction submodule converts the acquired vibration signal into a voltage signal and acquires frequency characteristics.
3. The device for monitoring the vibration state of the transformer according to claim 1, wherein the signal extraction module is connected to the data storage module through the trigger module, and specifically comprises:
the vibration signal extraction submodule of the signal extraction module is connected with the data storage module through the trigger module; the current sensor, the voltage sensor and the temperature sensor are all directly connected with the data storage module.
4. The device for monitoring the vibration state of the transformer according to claim 1, wherein the device comprises a plurality of data acquisition cards which are connected in an expanded manner in a cascade manner through Ethernet or a wireless local area network;
the data acquisition card is in communication connection with the host through the Ethernet or the wireless local area network.
5. The transformer vibration condition monitoring device according to claim 4, wherein the plurality of data acquisition cards includes a first acquisition card, a second acquisition card and a third acquisition card;
the first acquisition card is in communication connection with the host through an Ethernet or a local area network;
the second acquisition card is in communication connection with the first acquisition card through an Ethernet or a local area network;
and the third acquisition card is in communication connection with the second acquisition card through an Ethernet or a local area network.
6. The transformer vibration state monitoring device of claim 4, wherein the plurality of data acquisition cards comprises a first acquisition card, a second acquisition card, a third acquisition card, a fourth acquisition card and a fifth acquisition card;
the first acquisition card, the fourth acquisition card and the fifth acquisition card are in communication connection with the host through an Ethernet or a local area network;
the second acquisition card is in communication connection with the first acquisition card through an Ethernet or a local area network;
and the third acquisition card is in communication connection with the second acquisition card through an Ethernet or a local area network.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116295812A (en) * | 2023-05-22 | 2023-06-23 | 南方电网科学研究院有限责任公司 | Monitoring method and device for power transformer and electronic device |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116295812A (en) * | 2023-05-22 | 2023-06-23 | 南方电网科学研究院有限责任公司 | Monitoring method and device for power transformer and electronic device |
| CN116295812B (en) * | 2023-05-22 | 2023-08-18 | 南方电网科学研究院有限责任公司 | Monitoring method and device for power transformer and electronic device |
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