CN209881376U - Multifunctional PT protection device - Google Patents
Multifunctional PT protection device Download PDFInfo
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- CN209881376U CN209881376U CN201921171739.3U CN201921171739U CN209881376U CN 209881376 U CN209881376 U CN 209881376U CN 201921171739 U CN201921171739 U CN 201921171739U CN 209881376 U CN209881376 U CN 209881376U
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Abstract
The utility model discloses a multi-functional PT protection device, including be used for gathering the signal acquisition module of PT three-phase voltage and earthing voltage respectively, be used for enlargiing the voltage signal who gathers, rectification, filtering and steady voltage processing and AD conversion signal processing module, be used for clock module, central processing module and the power module to the time, signal acquisition module warp signal processing module with central processing module links to each other, central processing module still respectively with power module with clock module links to each other. The utility model adopts the above structure multi-functional PT protection device, carry out signal processing after the three-phase voltage through gathering PT (voltage transformer) and the earthing voltage, the rethread clock module carries out GPS to the time, can judge, report to the police and monitor information teletransmission through central processing module to PT's low-voltage, overvoltage, broken string or ferromagnetic fault, reduced various protective apparatus's the work load to the fault point has been reduced.
Description
Technical Field
The utility model relates to a PT protection technique especially relates to a multi-functional PT protection device.
Background
The present microcomputer PT (potential transformer) protection and measurement and control device is suitable for the neutral point of voltage class below 66kV, and is not grounded or grounded via resistor and arc suppression coil, and is used for monitoring the grounding condition of bus. The PT protection circuit has the advantages that various protection functions of PT, such as undervoltage, PT disconnection, grounding (zero sequence overvoltage) and the like, are realized, and various measurement and control functions of the PT, such as voltage measurement, are provided; a handcart position signal, a disconnecting link position signal and the like;
however, ferromagnetic resonance caused by PT overvoltage is not treated, PT ferromagnetic resonance is nonlinear resonance in resonance, and often appears as resonance overvoltage, which may destroy insulation of electrical equipment, even burn the electrical equipment, seriously threatens safe and stable operation of a power system, and at present, multiple sets of devices are required to cooperate to protect PT, more wiring is introduced, and difficulty in fault point and fault maintenance judgment is increased.
SUMMERY OF THE UTILITY MODEL
The utility model aims at providing a multi-functional PT protection device carries out signal processing after three-phase voltage and the grounding voltage through gathering PT (voltage transformer), and the rethread clock module carries out GPS to the time, can judge, report to the police and monitor information teletransmission through central processing module to PT's low-voltage, overvoltage, broken string or ferromagnetic trouble, has reduced various protective apparatus's the work load to the fault point has been reduced.
In order to realize the above object, the utility model provides a multi-functional PT protection device, including be used for gathering PT three-phase voltage respectively and the signal acquisition module who earths voltage, be used for with the voltage signal who gathers amplify, rectification, filtering and steady voltage processing and AD conversion the signal processing module, be used for clock module, central processing module and the power module to the time, the signal acquisition module warp signal processing module with central processing module links to each other, central processing module still respectively with power module with clock module links to each other.
Preferably, the utility model discloses still include communication module, central processing module warp communication module and human-computer interaction device communicate mutually, communication module includes ethernet communication unit and RS232/485 communication unit.
Preferably, the utility model discloses still include alarm module, alarm module with central processing module links to each other.
Preferably, the signal acquisition module comprises a sampling resistor and a current transformer which are respectively connected with the PT three-phase wire outlet end and the grounding wire in series, and the sampling resistor is connected with the current transformer in series.
Therefore, the utility model discloses an adopt multi-functional PT protection device of above-mentioned structure, carry out signal processing after the three-phase voltage through gathering PT (voltage transformer) and the earthing voltage, the rethread clock module carries out GPS to the time, can judge, report to the police and monitor information teletransmission through central processing module to PT's low-voltage, overvoltage, broken string or ferromagnetic trouble, reduced various protective apparatus's the amount of work a telephone switchboard to the fault point has been reduced.
The technical solution of the present invention is further described in detail by the accompanying drawings and examples.
Drawings
Fig. 1 is a block diagram of a multifunctional PT protection device according to an embodiment of the present invention;
fig. 2 is a schematic circuit diagram of a multifunctional PT protection device according to an embodiment of the present invention.
Detailed Description
The present invention will be further described with reference to the accompanying drawings, and it should be noted that the present embodiment is based on the technical solution, and the detailed embodiments and the specific operation processes are provided, but the protection scope of the present invention is not limited to the present embodiment.
Fig. 1 is a block diagram showing a structure of a multifunctional PT protection device according to an embodiment of the present invention, fig. 2 is a schematic circuit diagram showing a multifunctional PT protection device according to an embodiment of the present invention, as shown in fig. 1 and fig. 2, the structure of the present invention comprises a signal acquisition module for respectively acquiring PT three-phase voltage and grounding voltage, a signal processing module for amplifying, rectifying, filtering, voltage stabilizing and AD converting the acquired voltage signal, a clock module for timing, a central processing module and a power supply module, wherein the signal acquisition module comprises a sampling resistor and a current transformer which are respectively connected with the PT three-phase outlet terminal and the grounding wire in series, the sampling resistor is connected with the current transformer in series, the signal acquisition module is connected with the central processing module through the signal processing module, and the central processing module is also connected with the power module and the clock module respectively.
Preferably, the utility model discloses still include communication module, central processing module warp communication module and human-computer interaction device communicate mutually, communication module includes ethernet communication unit and RS232/485 communication unit.
Preferably, the utility model discloses still include alarm module, alarm module with central processing module links to each other.
It should be noted that, the present application can respectively give out alarm signals and display, automatically record and store related fault information, and report the information to the upper computer for various faults.
The working principle is as follows:
the method comprises the steps of obtaining neutral point grounding voltage of a primary winding and three-phase voltage of a secondary winding, saturated by a voltage transformer, through a signal acquisition module, calculating the three-phase voltages to obtain characteristic quantity of zero sequence voltage, and correspondingly determining fault reasons according to a judgment result after judging that the characteristic quantity of the zero sequence voltage and/or the neutral point grounding voltage meet alarm conditions.
For further convenience of understanding, the ferromagnetic resonance fault is taken as an example for explanation, voltage and frequency at three corners of an opening of a potential transformer PT are monitored in real time, and under the normal working condition, a high-power harmonic elimination element in the PT is in a blocking state and has no influence on a system; if the device is ferromagnetic resonance with a certain specific frequency, the device instantly starts a contactless resonance elimination element (high-power silicon controlled rectifier), a PT opening triangular winding is instantly short-circuited, the generated large damping can eliminate the ferromagnetic resonance, and the device is reset after overvoltage disappears without influencing the next use. Further, when the PT opening triangular voltage is larger than 30V, the system is in fault, the device carries out data acquisition and analysis on the opening triangular voltage of the voltage transformer, and judges the current fault state; if the voltage is over-voltage or grounded, the device gives corresponding alarm signals.
Therefore, the utility model discloses an adopt multi-functional PT protection device of above-mentioned structure, carry out signal processing after the three-phase voltage through gathering PT (voltage transformer) and the earthing voltage, the rethread clock module carries out GPS to the time, can judge, report to the police and monitor information teletransmission through central processing module to PT's low-voltage, overvoltage, broken string or ferromagnetic trouble, reduced various protective apparatus's the amount of work a telephone switchboard to the fault point has been reduced.
Finally, it should be noted that: the above embodiments are only for illustrating the technical solutions of the present invention and not for limiting the same, and although the present invention is described in detail with reference to the preferred embodiments, those skilled in the art should understand that: the technical solution of the present invention can still be modified or replaced by other equivalent means, and the modified technical solution can not be separated from the spirit and scope of the technical solution of the present invention.
Claims (4)
1. A multi-functional PT protection device which characterized in that: including the signal acquisition module that is used for gathering PT three-phase voltage and earthed voltage respectively, be used for with the voltage signal who gathers amplify, rectification, filtering and steady voltage processing and AD conversion's signal processing module, be used for clock module, central processing module and the power module to the time, signal acquisition module warp signal processing module with central processing module links to each other, central processing module still respectively with power module with clock module links to each other.
2. A multi-functional PT protection device as defined in claim 1 wherein: the communication module is used for communicating with the human-computer interaction equipment and comprises an Ethernet communication unit and an RS232/485 communication unit.
3. A multi-functional PT protection device as defined in claim 1 wherein: the alarm module is connected with the central processing module.
4. A multi-functional PT protection device as defined in claim 1 wherein: the signal acquisition module comprises a sampling resistor and a current transformer which are respectively connected with the PT three-phase wire outlet end and the grounding wire in series, and the sampling resistor is connected with the current transformer in series.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921171739.3U CN209881376U (en) | 2019-07-24 | 2019-07-24 | Multifunctional PT protection device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921171739.3U CN209881376U (en) | 2019-07-24 | 2019-07-24 | Multifunctional PT protection device |
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| Publication Number | Publication Date |
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| CN209881376U true CN209881376U (en) | 2019-12-31 |
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| CN201921171739.3U Active CN209881376U (en) | 2019-07-24 | 2019-07-24 | Multifunctional PT protection device |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111969559A (en) * | 2020-09-09 | 2020-11-20 | 广东电网有限责任公司 | Voltage transformer cabinet fault protection device and method |
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2019
- 2019-07-24 CN CN201921171739.3U patent/CN209881376U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111969559A (en) * | 2020-09-09 | 2020-11-20 | 广东电网有限责任公司 | Voltage transformer cabinet fault protection device and method |
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