CN217060335U - Voltage transformer fault monitoring system - Google Patents
Voltage transformer fault monitoring system Download PDFInfo
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- CN217060335U CN217060335U CN202220350563.3U CN202220350563U CN217060335U CN 217060335 U CN217060335 U CN 217060335U CN 202220350563 U CN202220350563 U CN 202220350563U CN 217060335 U CN217060335 U CN 217060335U
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Abstract
The utility model provides a voltage transformer fault monitoring system can carry out real-time supervision to the voltage transformer trouble, judges in advance the trouble, in the timely effectual discovery trouble reason of trouble initial stage, monitors the overheated problem of mutual-inductor insulation simultaneously, reduces the cost of overhaul, improves security and stability. The system comprises an in-situ acquisition unit, a background diagnosis platform, a high-frequency current transformer connected with a voltage transformer in series and a temperature sensor arranged on the voltage transformer; the output end of the high-frequency current transformer is connected with the input end of the on-site acquisition unit, the output end of the temperature sensor is connected with the input end of the on-site acquisition unit, and the output end of the on-site acquisition unit is connected with the input end of the background diagnosis platform.
Description
Technical Field
The utility model relates to a generator outlet voltage transformer fault detection technical field specifically is a voltage transformer fault monitoring system.
Background
The generator outlet voltage Transformer (PT) is used as a main device for electrical operation of a power generation enterprise, and has important functions of outlet voltage measurement, power generation amount measurement, relay protection, voltage acquisition of an excitation system and the like, and once an abnormality or a fault occurs, the safe and stable operation of a generator set is seriously influenced, and even the unit is unplanned to stop operation. Common faults of the outlet PT include turn-to-turn short circuit of a primary winding, fusing of a primary fuse, single-phase grounding and the like. Non-stop events due to turn-to-turn short circuits of the export PT windings often occur in power generation enterprises. The fault problem of the export PT becomes a weak link which seriously influences the safe operation of the unit and a prominent problem to be solved urgently.
Aiming at the common PT fault problems, the protection locking logic of the existing running relay protection device is not perfect, the equipment fault can not be effectively found at the initial stage of the fault, and the fault can only be exerted when the fault develops to a serious turn-to-turn short circuit or insulation damage stage. The conventional power failure detection method aiming at PT turn-to-turn short circuit, insulation defects and the like comprises a partial discharge test, a direct current resistance test, a transformation ratio test, a no-load current test and the like, but the power failure detection can only be used as a pre-test or a detection means after an accident occurs, the accident occurs and causes the fault confirmation after non-stop, and at the moment, serious equipment damage and economic loss are often caused. Therefore, compared with power failure detection, how to realize real-time fault early warning and diagnosis in the PT operation process by technical means is particularly important.
SUMMERY OF THE UTILITY MODEL
In order to solve the problem that exists among the prior art, the utility model provides a voltage transformer fault monitoring system can carry out real-time supervision to the voltage transformer trouble, judges in advance the trouble, in the timely effectual discovery trouble reason of trouble initial stage, monitors the overheated problem of mutual-inductor insulation simultaneously, reduces the cost of overhaul, improves security and stability.
The utility model discloses a realize through following technical scheme:
a voltage transformer fault monitoring system comprises an on-site acquisition unit, a background diagnosis platform, a high-frequency current transformer connected with the voltage transformer in series and a temperature sensor arranged on the voltage transformer;
the output end of the high-frequency current transformer is connected with the input end of the on-site acquisition unit, the output end of the temperature sensor is connected with the input end of the on-site acquisition unit, and the output end of the on-site acquisition unit is connected with the input end of the background diagnosis platform.
Preferably, the high-frequency current transformer is connected in series in a primary winding grounding wire of the voltage transformer, and an N terminal of the primary winding grounding wire is reliably grounded.
Preferably, the temperature sensor is attached to the insulating outer surface of the voltage transformer.
Preferably, the output end of the temperature sensor is reliably connected with the input end of the local acquisition unit through a temperature sensor signal wire.
Preferably, the output end of the high-frequency current transformer is reliably connected with the input end of the local acquisition unit through a high-frequency current transformer signal wire.
Preferably, the voltage transformer is a dry voltage transformer, a cast insulation voltage transformer, an oil-immersed voltage transformer or a gas insulation voltage transformer.
Preferably, the output end of the on-site acquisition unit is wirelessly connected with the input end of the background diagnosis platform.
Preferably, the background diagnosis platform comprises a data processing module and an alarm module, wherein the input end of the data processing module is connected with the output end of the local acquisition unit, the data processing module is used for receiving and analyzing data information, the output end of the data processing module is connected with the alarm module, and the alarm module is used for sending alarm information.
Compared with the prior art, the utility model discloses following profitable technological effect has:
the utility model provides a pair of voltage transformer fault monitoring system compares in the conventional power failure detection method to the PT trouble at present and only can regard as the detection means after pretesting or the occurence of failure, the system use the state to overhaul as guiding principle, through monitoring unit's non-intrusive mounting means, do not change by monitoring equipment's mode of connection, can safe and reliable carry out real-time supervision. By utilizing the high-frequency current transformer, partial discharge signals are sampled from a grounding wire of a high-voltage winding of the voltage transformer, the measured signals are analyzed, and characteristic values such as amplitude, phase, frequency spectrum and the like are extracted. Meanwhile, a temperature sensor is arranged on the voltage transformer body, so that the problem of insulation and overheating of the transformer is monitored in real time. The signals acquired and measured are subjected to noise reduction, filtering, identification and storage, information such as amplitude, pulse number, phase, original pulse, arrival time and the like of partial discharge is sent to a background diagnosis platform, a background diagnosis platform system is used for completing diagnosis and positioning of the partial discharge signals, relevant discharge maps and alarm information are generated, and the measured data are subjected to comprehensive fault diagnosis and prejudgment, so that the state of equipment is identified and evaluated. Voltage transformer fault monitoring system not only can realize real-time supervision, still can save the test cost that the power failure overhauld, further reduce the operation maintenance expense, the security and the stability of lift system.
Drawings
Fig. 1 is the utility model discloses voltage transformer fault monitoring system schematic diagram.
In the figure: 1. a voltage transformer; 2. a high-frequency current transformer; 3. a temperature sensor; 4. a temperature sensor signal line; 5. a high-frequency current transformer signal line; 6. a local acquisition unit; 7. and a background diagnosis platform.
Detailed Description
In order to make the technical solutions of the present invention better understood, the technical solutions in the embodiments of the present invention will be clearly and completely described below 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 shall belong to the protection scope of the present invention.
It should be noted that the terms "first," "second," and the like in the description and claims of the present invention and in the drawings described above are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used is interchangeable under appropriate circumstances such that the embodiments of the invention described herein are capable of operation in sequences other than those illustrated or otherwise described herein. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed, but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.
The present invention will be described in further detail with reference to the accompanying drawings:
as shown in fig. 1, the utility model provides a voltage transformer fault monitoring system, including high frequency current transformer 2 connected in series with voltage transformer 1, temperature sensor 3 arranged on voltage transformer 1, local acquisition unit 6 and background diagnosis platform 7;
the output end of the high-frequency current transformer 2 is connected with the input end of the local acquisition unit 6, the output end of the temperature sensor 3 is connected with the input end of the local acquisition unit 6, and the output end of the local acquisition unit 6 is connected with the input end of the background diagnosis platform 7.
The utility model provides a pair of voltage transformer fault monitoring system compares in the conventional power failure detection method (including partial discharge test, direct current resistance test, transformation ratio test and no-load current test etc.) to the PT trouble at present and only can regard as the detection means after pretesting or the occurence of failure, often causes serious equipment damage and economic loss when adopting the power failure detection method. The system use the state to overhaul as guiding principle, through monitoring unit's non-invasive mounting means, do not change by monitoring facilities's mode of connection, can safe and reliable carry out real-time supervision. By using a High Frequency Current Transformer (HFCT) 2, a partial discharge signal is sampled from a High voltage winding ground wire of the voltage Transformer 1, the measured signal is analyzed, and characteristic values such as an amplitude value, a phase value, a Frequency spectrum and the like are extracted. Meanwhile, a temperature sensor 3 is arranged on the body of the voltage transformer 1, and the problem of insulation overheating of the transformer is monitored in real time. The signals obtained by collection and measurement are subjected to noise reduction, filtering, identification and storage, information such as amplitude, pulse number, phase, original pulse, arrival time and the like of partial discharge is sent to the background diagnosis platform 7, the background diagnosis platform 7 system finishes diagnosis and positioning of the partial discharge signals, a related discharge map and alarm information are generated, and the measured data are subjected to comprehensive fault diagnosis and prejudgment, so that the state of the equipment is identified and evaluated. Voltage transformer 1 fault monitoring system not only can realize real-time supervision, still can save the test cost that the power failure overhauld, further reduce the operation maintenance expense, promote voltage transformer 1 fault monitoring system's security and stability.
Further, the high-frequency current transformer 2 is connected in series in a primary winding grounding wire of the voltage transformer 1, an N terminal of the primary winding grounding wire is reliably grounded, the high-frequency current transformer 2 directly samples partial discharge signals including characteristic values such as amplitude, phase and frequency spectrum from a high-voltage winding grounding wire of the voltage transformer 1, relevant data information of the voltage transformer 1 can be collected without changing a wiring mode, and the data information is transmitted to the background diagnosis platform 7 to be subjected to comprehensive fault diagnosis and prejudgment, so that real-time fault early warning and diagnosis in the PT operation process are realized.
Further, temperature sensor 3 and the laminating of voltage transformer 1's insulating surface, specifically, in this embodiment, install the central point department of insulating surface at voltage transformer 1, can make temperature measurement result more even and accurate.
In this embodiment, the output end of the temperature sensor 3 is reliably connected with the input end of the local acquisition unit 6 through the temperature sensor signal line 4.
In this embodiment, the output end of the high-frequency current transformer 2 is reliably connected with the input end of the local acquisition unit 6 through the high-frequency current transformer signal line 5.
Preferably, the voltage transformer 1 is a dry voltage transformer, a cast insulation voltage transformer, an oil-immersed voltage transformer or a gas insulation voltage transformer.
In this embodiment, the output end of the local acquisition unit 6 is wirelessly connected with the input end of the background diagnosis platform 7.
Furthermore, the background diagnosis platform 7 comprises a data processing module and an alarm module, wherein the input end of the data processing module is connected with the output end of the local acquisition unit 6, the data processing module is used for receiving and analyzing data information, the output end of the data processing module is connected with the alarm module, and the alarm module is used for sending alarm information.
The utility model provides an in the embodiment insulating surface of 1 body of voltage transformer laminate with temperature sensor 3, temperature sensor 3 and collection unit 6 pass through temperature sensor signal line 4 reliably to be connected on the spot, form insulating overheated on-line monitoring return circuit. The high-frequency current transformer 2 is connected in series into a primary winding grounding wire of the voltage transformer 1, a signal wire 5 of the high-frequency current transformer is reliably connected with the local acquisition unit 6 to form a turn-to-turn short circuit and partial discharge monitoring loop of the voltage transformer 1, and the local acquisition unit 6 and the background diagnosis platform 7 perform real-time data transmission through wireless communication.
Implement the voltage transformer fault monitoring system during, concrete implementation process as follows:
1) carrying out installation preparation work of online fault monitoring of the voltage transformer 1, and entering the step 2 after all the early preparation work is finished);
2) and opening the N terminal of the grounding wire of the primary winding of the voltage transformer 1, and connecting the high-frequency current transformer 2 in series into the grounding wire. And then the terminal N of the primary winding grounding wire of the voltage transformer 1 is reliably grounded. Entering step 3);
3) the information transmission interface of the high-frequency current transformer 2 is connected to the local acquisition unit 6 through a double-shielded coaxial cable. Entering step 4);
4) the temperature sensor 3 is pasted on the central side of the insulating outer surface of the voltage transformer 1 body, and the temperature sensor signal wire 4 is connected to the local acquisition unit 6. Entering step 5);
5) and turning on a power switch of the local acquisition unit 6, turning on the background diagnosis platform 7, and debugging wireless transmission, so that the background diagnosis platform 7 can receive the temperature and the partial discharge signal, and the background diagnosis platform 7 finishes diagnosis and positioning of the partial discharge signal to generate a related discharge map and alarm information.
Other embodiments of the invention will be apparent to those skilled in the art from consideration of the specification and practice of the invention disclosed herein. This application is intended to cover any variations, uses, or adaptations of the invention following, in general, the principles of the invention and including such departures from the present disclosure as come within known or customary practice within the art to which the invention pertains. The embodiments described in this specification are to be considered exemplary only, with a true scope of the application being indicated by the following claims.
It will be understood that the invention is not limited to the precise arrangements that have been described above and shown in the drawings, and that various modifications and changes may be made without departing from the scope thereof. The scope of protection of the invention is defined by the claims.
Claims (8)
1. A voltage transformer fault monitoring system is characterized by comprising an on-site acquisition unit (6), a background diagnosis platform (7), a high-frequency current transformer (2) connected with a voltage transformer (1) in series and a temperature sensor (3) arranged on the voltage transformer (1);
the output end of the high-frequency current transformer (2) is connected with the input end of the local acquisition unit (6), the output end of the temperature sensor (3) is connected with the input end of the local acquisition unit (6), and the output end of the local acquisition unit (6) is connected with the input end of the background diagnosis platform (7).
2. A voltage transformer fault monitoring system according to claim 1, characterized in that the high frequency current transformer (2) is connected in series in the primary winding ground of the voltage transformer (1), and the N-terminal of the primary winding ground is reliably grounded.
3. The voltage transformer fault monitoring system of claim 1, characterized in that the temperature sensor (3) is attached to the insulating outer surface of the voltage transformer (1).
4. A voltage transformer fault monitoring system according to claim 1, characterized in that the output of the temperature sensor (3) is securely connected to the input of the local acquisition unit (6) via a temperature sensor signal line (4).
5. A voltage transformer fault monitoring system according to claim 1, characterized in that the output of the high frequency current transformer (2) is securely connected to the input of the local acquisition unit (6) via a high frequency current transformer signal line (5).
6. The voltage transformer fault monitoring system according to claim 1, characterized in that the voltage transformer (1) is a dry voltage transformer, a cast insulation voltage transformer, an oil-immersed voltage transformer or a gas insulation voltage transformer.
7. The voltage transformer fault monitoring system of claim 1, characterized in that the output end of the local acquisition unit (6) is wirelessly connected with the input end of a background diagnosis platform (7).
8. The voltage transformer fault monitoring system of claim 1, characterized in that the background diagnosis platform (7) comprises a data processing module and an alarm module, an input end of the data processing module is connected with an output end of the on-site acquisition unit (6), the data processing module is used for receiving and analyzing data information, an output end of the data processing module is connected with the alarm module, and the alarm module is used for sending alarm information.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202220350563.3U CN217060335U (en) | 2022-02-21 | 2022-02-21 | Voltage transformer fault monitoring system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202220350563.3U CN217060335U (en) | 2022-02-21 | 2022-02-21 | Voltage transformer fault monitoring system |
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| Publication Number | Publication Date |
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| CN217060335U true CN217060335U (en) | 2022-07-26 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202220350563.3U Active CN217060335U (en) | 2022-02-21 | 2022-02-21 | Voltage transformer fault monitoring system |
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- 2022-02-21 CN CN202220350563.3U patent/CN217060335U/en active Active
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