CN221326742U - PT neutral point multipoint grounding real-time monitoring system based on fault wave recording - Google Patents
PT neutral point multipoint grounding real-time monitoring system based on fault wave recording Download PDFInfo
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- CN221326742U CN221326742U CN202322432624.8U CN202322432624U CN221326742U CN 221326742 U CN221326742 U CN 221326742U CN 202322432624 U CN202322432624 U CN 202322432624U CN 221326742 U CN221326742 U CN 221326742U
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Abstract
The utility model discloses a fault wave recording-based PT neutral point multipoint grounding real-time monitoring system, which is characterized in that PT neutral point current is connected to a fault wave recording processor, PT neutral point current is monitored in real time, whether multipoint grounding exists in the PT neutral point or not is judged through a preset value, and alarm wave recording is automatically carried out when the PT neutral point multipoint grounding occurs; the system utilizes fault wave recording equipment commonly installed in power plants and substations to carry out PT neutral point multipoint grounding real-time monitoring, carries out wave recording on current of a PT secondary neutral line, and transmits alarm information and wave recording waveforms to a remote intelligent data analysis platform for checking and analysis through an IEC61850 communication protocol. The system is convenient to install, low in operation complexity, and beneficial to safe and stable operation of the power system, and efficiency is greatly improved.
Description
Technical Field
The utility model belongs to the technical field of power monitoring, and relates to a PT neutral point multipoint grounding real-time monitoring system based on fault wave recording.
Background
In actual operation, due to design, construction, secondary equipment aging and insulation breakdown, the PT secondary neutral point is possibly grounded at two points, when a system fails, a large fault current flows through a ground network, at the moment, potential difference occurs at two ends of the PT secondary neutral point, voltage phase offset of the neutral point is caused, amplitude and phase of phase voltage and zero sequence voltage are affected, and distance protection, zero sequence direction protection refusal or misoperation can be caused.
The current technology is, for example, the system for detecting the grounding current of the secondary circuit N600 of the distributed voltage transformer of the China patent No. CN202111479926: the equipment to be installed is more, and the PT neutral point current cannot be recorded.
Disclosure of utility model
The utility model aims to provide a PT neutral point multipoint grounding real-time monitoring system, which comprehensively controls the point grounding condition of the PT neutral point in the jurisdiction by monitoring the PT neutral point grounding current condition in real time, can trigger relevant alarm information in time when the PT neutral point multipoint grounding occurs, can record the waveform of the grounding current, and can transmit the alarm information and the recorded waveform to a remote intelligent data analysis platform for checking and analysis through an IEC61850 communication protocol.
In order to achieve the above purpose, the utility model is realized by the following technical scheme:
The utility model relates to a PT neutral point multipoint grounding real-time monitoring system based on fault wave recording, which comprises: the system comprises a current transformer, a power supply mechanism, a fault wave recording signal collector, a fault wave recording signal processor and a fault wave recording display; wherein,
The power supply mechanism is connected with the current transformer for supplying power;
The secondary neutral line of the voltage transformer to be tested passes through the coil of the current transformer;
The output terminal of the current transformer is connected with the input end of the fault wave recording signal collector, and the neutral point current analog quantity of the voltage transformer to be tested is collected through the fault wave recording signal collector and is converted into data quantity;
the output end of the fault wave recording signal collector is connected with the input end of the fault wave recording signal processor, the neutral point current data quantity of the voltage transformer to be tested is input into the fault wave recording signal processor, and whether the PT neutral point multipoint grounding fault occurs or not is judged through the fault wave recording signal processor;
If so, the first output end of the fault wave recording signal processor is connected with the fault wave recording display to display fault information and current waveforms.
As a preferable technical scheme, a second output end of the fault wave recording signal processor is connected with a monitoring background signal alarm device, and when the voltage transformer to be tested is judged to have PT neutral point multipoint grounding faults, the monitoring background signal alarm device is controlled to start and send out alarm signals.
As a preferable technical scheme, the third output end of the fault wave recording signal processor is communicated with the remote intelligent data analysis platform through an IEC 61850 communication protocol.
As a preferable technical scheme, the current transformer adopts a through active current transformer, the measuring range is 0-100 mA of alternating current, and the electric output is 4-20 mA of direct current analog quantity.
As a preferable technical scheme, the current transformer is powered by a 24V direct current power supply; the power supply mechanism inputs 220V alternating current power supply and outputs 24V direct current power supply to supply power for the current transformer.
Compared with the prior art, the PT neutral point multipoint grounding real-time monitoring system based on fault wave recording is characterized in that PT neutral point current is connected into a fault wave recording signal processor, PT neutral point current is monitored in real time, whether multipoint grounding exists in the PT neutral point or not is judged through a preset value, and alarm wave recording is automatically carried out when the PT neutral point multipoint grounding occurs; the system utilizes fault wave recording equipment commonly installed in power plants and substations to carry out PT neutral point multipoint grounding real-time monitoring, carries out wave recording on current of a PT secondary neutral line, and transmits alarm information and wave recording waveforms to a remote intelligent data analysis platform for checking and analysis through an IEC61850 communication protocol. The system is convenient to install, low in operation complexity, and beneficial to safe and stable operation of the power system, and efficiency is greatly improved.
Drawings
The utility model and/or additional aspects and advantages will be apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings, in which:
Fig. 1 is a schematic structural diagram of a PT neutral point multipoint earthing real-time monitoring system based on fault wave recording.
Detailed Description
Embodiments of the present utility model are described in detail below, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to like or similar elements or elements having like or similar functions throughout. The embodiments described below by referring to the drawings are illustrative and intended to explain the present utility model and should not be construed as limiting the utility model.
Fig. 1 is a real-time monitoring system for PT neutral point multipoint earthing based on fault recording according to an embodiment of the present utility model, including: the fault recorder comprises a current transformer 1, a power supply mechanism 2, a fault wave recording signal collector 3, a fault wave recording signal processor 4 and a fault wave recording display 5; wherein,
The power supply mechanism 2 is connected with the current transformer 1 for supplying power;
The secondary neutral line of the voltage transformer to be tested passes through the coil of the current transformer 1;
The output terminal of the current transformer 1 is connected with the input end of the fault wave recording signal collector 3, and the neutral point current analog quantity of the voltage transformer to be tested is collected through the fault wave recording signal collector 3 and converted into data quantity;
The output end of the fault wave recording signal collector 3 is connected with the input end of the fault wave recording signal processor 4, the neutral point current data quantity of the voltage transformer to be tested is input into the fault wave recording signal processor 4, and whether the PT neutral point multipoint grounding fault occurs or not is judged through the fault wave recording signal processor 4;
If so, the fault record display 5 is connected to the first output terminal 41 of the fault record signal processor 4 to display fault information and current waveforms.
As a preferred technical scheme, the second output end 42 of the fault wave recording signal processor 4 is connected with the monitoring background signal alarm device 6, and when the voltage transformer to be tested is judged to have the PT neutral point multipoint grounding fault, the monitoring background signal alarm device 6 is controlled to start and send out an alarm signal.
As a preferred solution, the third output 43 of the fault-recording signal processor 4 communicates with the remote intelligent data analysis platform 7 via an IEC 61850 communication protocol.
As a preferable technical scheme, the current transformer 1 adopts a through active current transformer, the measuring range is 0-100 mA of alternating current, and 4-20 mA of direct current analog quantity is electrically output.
As a preferable technical scheme, the current transformer 1 is powered by a 24V direct current power supply; the power supply mechanism 2 inputs 220V alternating current power supply and outputs 24V direct current power supply to supply power for the current transformer 1.
Specifically, in the actual monitoring process, the system of the utility model is placed at a position near the voltage transformer to be tested. The system is started by passing a secondary neutral line of the voltage transformer to be tested through a coil of the current transformer 1, and after the current transformer 1 is electrified, a current induction signal is generated due to the existence of the secondary neutral line of the voltage transformer to be tested, and the current induction signal is output through the current transformer 1; the current induction signals are transmitted to the fault wave recording signal collector 3, and the fault wave recording signal collector 3 is used for collecting and analog-to-digital converting the current induction signals, so that analog quantity signals of the current induction signals are converted into digital quantity signals. After the digital quantity signal of the current induction signal is transmitted to the fault wave recording signal processor 4, the digital quantity signal is used as a current signal of the secondary neutral line of the voltage transformer to be tested, and the current signal is compared with a preset action alarm threshold value. When the current of the secondary neutral line of the voltage transformer to be tested is larger than the action alarm threshold value, the first output end 41 of the fault wave recording signal processor 4 is connected with the fault wave recording display 5, and fault current signals are sent to the fault wave recording display 5 for current waveform wave recording. Meanwhile, the second output end 42 of the fault wave recording signal processor 4 is connected to the monitoring background signal alarm device 6 to remind an operator on duty of carrying out fault processing.
For a power plant or a transformer station provided with the remote intelligent data analysis platform, the alarm information and the wave recording waveforms can be transmitted to the remote intelligent data analysis platform 7 through the third output end 43 of the fault wave recording signal processor 4 according to the IEC61850 communication protocol, and can be checked and analyzed remotely.
Compared with the prior art, the PT neutral point multipoint grounding real-time monitoring system based on fault wave recording is characterized in that PT neutral point current is connected into a fault wave recording signal processor, PT neutral point current is monitored in real time, whether multipoint grounding exists in the PT neutral point or not is judged through a preset value, and alarm wave recording is automatically carried out when the PT neutral point multipoint grounding occurs; the system utilizes fault wave recording equipment commonly installed in power plants and substations to carry out PT neutral point multipoint grounding real-time monitoring, carries out wave recording on current of a PT secondary neutral line, and transmits alarm information and wave recording waveforms to a remote intelligent data analysis platform for checking and analysis through an IEC61850 communication protocol. The system is convenient to install, low in operation complexity, and beneficial to safe and stable operation of the power system, and efficiency is greatly improved.
In the description of the present specification, a description referring to terms "one embodiment," "some embodiments," "examples," "specific examples," or "some examples," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present utility model. In this specification, schematic representations of the terms are not necessarily directed to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, the different embodiments or examples described in this specification and the features of the different embodiments or examples may be combined and combined by those skilled in the art without contradiction.
Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include at least one such feature. In the description of the present utility model, the meaning of "plurality" means at least two, for example, two, three, etc., unless specifically defined otherwise.
Any process or method descriptions in flow charts or otherwise described herein may be understood as representing modules, segments, or portions of code which include one or more executable instructions for implementing specific logical functions or steps of the process, and further implementations are included within the scope of the preferred embodiment of the present utility model in which functions may be executed out of order from that shown or discussed, including substantially concurrently or in reverse order from that shown or discussed, depending on the functionality involved, as would be understood by those reasonably skilled in the art of the embodiments of the present utility model.
Although embodiments of the present utility model have been shown and described above, it will be understood that the embodiments are illustrative and not to be construed as limiting the utility model, and that variations, modifications, alternatives and variations may be made to the embodiments by one of ordinary skill in the art within the scope of the utility model.
Claims (5)
1. PT neutral point multipoint earthing real-time monitoring system based on fault record wave, characterized by comprising: the system comprises a current transformer, a power supply mechanism, a fault wave recording signal collector, a fault wave recording signal processor and a fault wave recording display; wherein,
The power supply mechanism is connected with the current transformer for supplying power;
The secondary neutral line of the voltage transformer to be tested passes through the coil of the current transformer;
The output terminal of the current transformer is connected with the input end of the fault wave recording signal collector, and the neutral point current analog quantity of the voltage transformer to be tested is collected through the fault wave recording signal collector and is converted into data quantity;
the output end of the fault wave recording signal collector is connected with the input end of the fault wave recording signal processor, the neutral point current data quantity of the voltage transformer to be tested is input into the fault wave recording signal processor, and whether the PT neutral point multipoint grounding fault occurs or not is judged through the fault wave recording signal processor;
If so, the first output end of the fault wave recording signal processor is connected with the fault wave recording display to display fault information and current waveforms.
2. The fault-recording-based PT neutral point multipoint grounding real-time monitoring system according to claim 1, wherein a second output end of the fault-recording signal processor is connected with a monitoring background signal alarming device, and when the fact that the PT neutral point multipoint grounding fault occurs in the voltage transformer to be tested is judged, the monitoring background signal alarming device is controlled to be started and an alarm signal is sent out.
3. The fault-recording-based PT neutral point multi-point grounding real-time monitoring system of claim 1, wherein the third output of the fault-recording signal processor communicates with a remote intelligent data analysis platform via an IEC 61850 communication protocol.
4. The fault-recording-based PT neutral point multipoint grounding real-time monitoring system according to claim 1, wherein the current transformer is a through active current transformer, the measuring range is 0-100 mA alternating current, and the electric output is 4-20 mA direct current analog quantity.
5. The fault-recording-based PT neutral point multipoint grounding real-time monitoring system according to claim 1, wherein the current transformer is powered by a 24V direct current power supply; the power supply mechanism inputs 220V alternating current power supply and outputs 24V direct current power supply to supply power for the current transformer.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202322432624.8U CN221326742U (en) | 2023-09-07 | 2023-09-07 | PT neutral point multipoint grounding real-time monitoring system based on fault wave recording |
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| CN202322432624.8U CN221326742U (en) | 2023-09-07 | 2023-09-07 | PT neutral point multipoint grounding real-time monitoring system based on fault wave recording |
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