CN110542784A - CVT secondary side remote monitoring device - Google Patents
CVT secondary side remote monitoring device Download PDFInfo
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- CN110542784A CN110542784A CN201810525726.5A CN201810525726A CN110542784A CN 110542784 A CN110542784 A CN 110542784A CN 201810525726 A CN201810525726 A CN 201810525726A CN 110542784 A CN110542784 A CN 110542784A
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- 238000012806 monitoring device Methods 0.000 title claims abstract description 21
- 238000012545 processing Methods 0.000 claims abstract description 15
- 230000009466 transformation Effects 0.000 claims abstract description 14
- 239000003990 capacitor Substances 0.000 claims description 20
- 238000004891 communication Methods 0.000 claims description 19
- 230000001681 protective effect Effects 0.000 claims description 10
- 238000010223 real-time analysis Methods 0.000 claims description 10
- 238000004458 analytical method Methods 0.000 abstract description 7
- 238000012544 monitoring process Methods 0.000 description 6
- 238000012360 testing method Methods 0.000 description 4
- 230000001052 transient effect Effects 0.000 description 3
- 230000002159 abnormal effect Effects 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 2
- 238000007405 data analysis Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000005259 measurement Methods 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 230000015556 catabolic process Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 230000005350 ferromagnetic resonance Effects 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000007726 management method Methods 0.000 description 1
- 230000000737 periodic effect Effects 0.000 description 1
- 230000003449 preventive effect Effects 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 230000004044 response Effects 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
- G01R19/25—Arrangements for measuring currents or voltages or for indicating presence or sign thereof using digital measurement techniques
- G01R19/2503—Arrangements for measuring currents or voltages or for indicating presence or sign thereof using digital measurement techniques for measuring voltage only, e.g. digital volt meters (DVM's)
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Abstract
The invention discloses a CVT secondary side remote monitoring device which comprises a microprocessor chip, a low-pass filter circuit, a voltage transformation module, a display module, a first data memory and a second data memory, wherein the input end of the low-pass filter circuit is electrically connected with a wiring terminal of the CVT secondary side; the output end of the low-pass filter circuit is electrically connected with the input end of the voltage transformation module; the output end of the voltage transformation module is electrically connected with the first input end of the micro-processing chip; the first output end of the micro-processing chip is electrically connected with the input end of the display module; the second output end of the micro-processing chip is electrically connected with the input end of the first data memory; and the third output end of the micro-processing chip is electrically connected with the input end of the second data memory. The invention detects and analyzes the voltage condition of the secondary side of the CVT in real time on the premise of not influencing the operation of a power grid, synchronously stores the voltage information and the analysis result, and ensures the safety of the CVT equipment.
Description
Technical Field
the invention relates to the field of CVT monitoring, in particular to a CVT secondary side remote monitoring device.
Background
a Capacitor Voltage Transformer (CVT) is widely used in power systems, is a power device for Voltage measurement, power measurement and control, automatic control, relay protection and also used as a power line carrier Capacitor, has small impact strength, small volume and light weight, can reliably damp ferromagnetic resonance, and has excellent transient response characteristics. The preventive test of the power equipment is a periodic power failure test and is an important link in the operation and maintenance work of the power equipment.
At present, CVT pre-test can diagnose the conditions of medium insulation performance, capacitance breakdown, oil shortage and the like of the CVT mainly by measuring capacitance and dielectric loss. In fact, the purpose can be achieved by monitoring the secondary voltage in real time, and even by analyzing the change trend of the secondary voltage of the CVT, the problem which cannot be found out by the traditional pretest can be found. The current CVT online monitoring system generally directly acquires CVT secondary voltage data from an EMS energy management system background, original voltage real-time data can be processed into an average effective value at the EMS system, and the average effective value is stored into a database once in 15 minutes. The number that can be retrieved from the EMS database is also 15 minutes. This frequency data is sufficient for steady state analysis of the CVT and also meets the basic requirements of the test, but cannot be captured by an online monitoring system if a transient or transient event occurs in the CVT.
Disclosure of Invention
The invention overcomes the defects of the existing CVT detection and provides a novel CVT secondary side remote monitoring device. The invention effectively detects the voltage condition of the secondary side of the CVT on the premise of not influencing the operation of a power grid, and ensures the safety of CVT equipment.
in order to solve the technical problems, the technical scheme of the invention is as follows:
A CVT secondary side remote monitoring device is characterized by comprising a microprocessor chip, a low-pass filter circuit, a voltage transformation module, a display module, a first data memory and a second data memory, wherein,
the input end of the low-pass filter circuit is electrically connected with a wiring terminal on the secondary side of the CVT;
the output end of the low-pass filter circuit is electrically connected with the input end of the voltage transformation module;
The output end of the voltage transformation module is electrically connected with the first input end of the micro-processing chip;
The first output end of the micro-processing chip is electrically connected with the input end of the display module;
The second output end of the micro-processing chip is electrically connected with the input end of the first data memory;
and the third output end of the micro-processing chip is electrically connected with the input end of the second data memory.
the working process of the invention is as follows:
Firstly, voltage signals are collected from the secondary side of the CVT, after the voltage signals are filtered through a low-pass filter circuit, the voltage signals (0-57V) are reduced to about 0V-3V through a voltage transformation module, then analog-to-digital conversion and data analysis are carried out through a micro-processing chip, and analysis results and signal waveforms are displayed through a display module. Meanwhile, abnormal data in the collected data are stored in the first data memory each time; and for normal data in the collected data, intermittently storing the normal data in the second data memory.
In a preferred embodiment, the low-pass filter circuit includes a first resistor, a second resistor, a third resistor, a first capacitor, a second capacitor, and an operational amplifier, wherein,
One end of the first resistor is used as the input end of the low-pass filter circuit, and the other end of the first resistor is electrically connected with one end of the second resistor;
The other end of the first resistor is electrically connected with one end of the first capacitor;
The other end of the first capacitor is electrically connected with the output end of the operational amplifier;
the other end of the second resistor is electrically connected with the non-inverting input end of the operational amplifier;
the other end of the second resistor is electrically connected with one end of the second capacitor;
The other end of the second capacitor is grounded;
the output end of the operational amplifier is electrically connected with the inverting input end of the output end of the operational amplifier;
The output end of the operational amplifier is electrically connected with one end of the third resistor, and the other end of the third resistor is used as the output end of the low-pass filter circuit.
In a preferred scheme, the CVT secondary side data real-time analysis and storage device further comprises a housing, the acquisition module, the microprocessor chip, the low-pass filter circuit, the voltage transformation module, the first data memory and the second data memory are all arranged on the inner side of the housing, and the input port of the low-pass filter circuit is arranged on the outer side of the housing; the display module is arranged on the outer side of the shell.
In a preferred scheme, the casing comprises a base, the base is provided with bolt holes, and the CVT secondary side data real-time analysis storage device is fixedly arranged on the CVT equipment through the bolts, the nuts and the bolt holes.
in a preferred scheme, the CVT secondary side data real-time analysis and storage device further comprises a wireless communication module, and the wireless communication module is electrically connected with the microprocessor chip.
in a preferred scheme, the wireless communication module comprises a 4G communication module, and an input end of the 4G communication module is connected with a fourth output end of the microprocessor chip.
In this preferred scheme, 4G communication module can send monitoring data to in the staff hand of distant place.
In a preferred scheme, the wireless communication module comprises a WIFI module, and an input end of the WIFI module and a fifth output end of the microprocessor chip are connected; a plurality of CVT secondary side remote real-time monitoring devices form a local area network through a WIFI module.
in the preferred scheme, a local area network is formed by the WIFI modules, and monitoring data of the CVT secondary side remote real-time monitoring device can circulate in the local area network.
in a preferred scheme, the CVT secondary side data real-time analysis storage device further comprises a standby power supply, and the standby power supply is used for sending power-off information through the 4G communication module by the microprocessor chip under the condition of power-off.
in a preferred scheme, the CVT secondary side data real-time analysis and storage device further comprises a power supply circuit, wherein the power supply circuit is directly connected to a mains socket and also charges a standby power supply.
in the preferred scheme, the power supply circuit ensures that the CVT secondary side data real-time analysis storage device can be directly supplied with power by commercial power and can also be supplied with power by a standby power supply.
in a preferred embodiment, the CVT secondary side remote monitoring device further comprises a fuse, wherein,
one end of the protective tube is electrically connected with the input end of the low-pass filter circuit;
the other end of the protective tube is electrically connected with the input end of the voltage transformation module.
In the preferred scheme, the protective tube ensures that the secondary side of the CVT cannot directly burn and damage equipment.
in a preferred embodiment, the fuse tube is a 0.1A fuse tube.
Compared with the prior art, the technical scheme of the invention has the beneficial effects that:
the invention detects and analyzes the voltage condition of the secondary side of the CVT in real time on the premise of not influencing the operation of a power grid, synchronously stores the voltage information and the analysis result, and ensures the safety of the CVT equipment.
Drawings
Fig. 1 is a module installation diagram of the embodiment.
Fig. 2 is a circuit diagram of a low-pass filter in an embodiment.
description of reference numerals: 1. an input end; 2. an output end; 3. an operational amplifier; .
Detailed Description
the drawings are for illustrative purposes only and are not to be construed as limiting the patent;
for the purpose of better illustrating the embodiments, certain features of the drawings may be omitted, enlarged or reduced, and do not represent the size of an actual product;
it will be understood by those skilled in the art that certain well-known structures in the drawings and descriptions thereof may be omitted.
the technical solution of the present invention is further described below with reference to the accompanying drawings and examples.
As shown in fig. 1, a CVT secondary side remote monitoring device comprises a low pass filter circuit, a fuse tube, a voltage transmitter, an enhanced STM32 chip, a WIFI module, a camera, a 4G communication module, a first TF card, a second TF card, a housing and an LCD display screen, wherein,
The input end of the low-pass filter circuit is electrically connected with a wiring terminal on the secondary side of the CVT;
The output end of the low-pass filter circuit is electrically connected with one end of the protective tube;
The other end of the protective tube is electrically connected with the input end of the voltage transmitter;
the output end of the voltage transmitter is electrically connected with the first input end of the enhanced STM32 chip;
The output end of the camera is electrically connected with the second input end of the enhanced STM32 chip;
a first output end of the enhanced STM32 chip is electrically connected with an input end of the WIFI module;
a second output end of the enhanced STM32 chip is electrically connected with an input end of the 4G communication module;
a third output end of the enhanced STM32 chip is electrically connected with an input end of the first TF card;
a fourth output end of the enhanced STM32 chip is electrically connected with an input end of the LCD screen;
A fifth output of the enhanced STM32 chip is electrically connected to an input of a second TF card.
As shown in fig. 2, the low-pass filter circuit includes a first resistor, a second resistor, a third resistor, a first capacitor, a second capacitor, and an operational amplifier,
one end of the first resistor is used as an input end 1 of the low-pass filter circuit, and the other end of the first resistor is electrically connected with one end of the second resistor;
the other end of the first resistor is electrically connected with one end of the first capacitor;
The other end of the first capacitor is electrically connected with the output end of the operational amplifier 3;
The other end of the second resistor is electrically connected with the non-inverting input end of the operational amplifier 3;
the other end of the second resistor is electrically connected with one end of the second capacitor;
the other end of the second capacitor is grounded;
The output end of the operational amplifier 3 is electrically connected with the inverting input end of the output end of the operational amplifier 3;
the output end of the operational amplifier 3 is electrically connected with one end of the third resistor, and the other end of the third resistor is used as the output end 2 of the low-pass filter circuit.
the low-pass filter circuit, the protective tube, the acquisition unit, the voltage transmitter, the enhanced STM32 chip, the WIFI module, the 4G communication module, the first TF card and the second TF card are all arranged on the inner side of the shell, and the input port of the low-pass filter circuit is arranged on the outer side of the shell; the camera and the LCD screen are arranged on the outer side of the shell. The shell includes the base, and the base is provided with the bolt hole, and the embodiment passes through the bolt, and nut and bolt hole are fixed to be set up on CVT equipment.
The working process of the embodiment is as follows:
Firstly, voltage signals (0-57V) are collected from the secondary side of the CVT, firstly, filtering is carried out through a low-pass filter circuit, then voltage reduction processing is carried out through a voltage transmitter, finally, analog-to-digital conversion and data analysis are carried out through an enhanced STM32 chip, and data and analysis results are stored through a TF card. Meanwhile, the analysis result of the enhanced STM32 chip is sent to the hands of workers through the 4G communication module, and the LCD display screen is used for displaying the analysis result. The WIFI module is used for carrying out data transmission in a local area network formed by the CVT. The camera collects waveform images of the LCD display screen and image data of the secondary side of the CVT, and the waveform images and the image data are sent to the hands of remote workers through the 4G communication module. If the current of the secondary side of the CVT exceeds the limit of the protective tube, the protective tube is automatically disconnected, and equipment is protected. Storing abnormal data in the collected data in the first TF card every time; and for normal data in the collected data, intermittently storing the data in the second TF card.
the same or similar reference numerals correspond to the same or similar parts;
the terms describing positional relationships in the drawings are for illustrative purposes only and are not to be construed as limiting the patent;
it should be understood that the above-described embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. Any modification, equivalent replacement, and improvement made within the spirit and principle of the present invention should be included in the protection scope of the claims of the present invention.
Claims (10)
1. a CVT secondary side remote monitoring device is characterized by comprising a microprocessor chip, a low-pass filter circuit, a voltage transformation module, a display module, a first data memory and a second data memory, wherein,
the input end of the low-pass filter circuit is electrically connected with a wiring terminal on the secondary side of the CVT;
The output end of the low-pass filter circuit is electrically connected with the input end of the voltage transformation module;
The output end of the voltage transformation module is electrically connected with the first input end of the micro-processing chip;
the first output end of the micro-processing chip is electrically connected with the input end of the display module;
the second output end of the micro-processing chip is electrically connected with the input end of the first data memory;
And the third output end of the micro-processing chip is electrically connected with the input end of the second data memory.
2. The CVT secondary side remote monitoring device of claim 1, wherein the low pass filter circuit includes a first resistor, a second resistor, a third resistor, a first capacitor, a second capacitor, an operational amplifier, wherein,
one end of the first resistor is used as the input end of the low-pass filter circuit, and the other end of the first resistor is electrically connected with one end of the second resistor;
The other end of the first resistor is electrically connected with one end of the first capacitor;
the other end of the first capacitor is electrically connected with the output end of the operational amplifier;
The other end of the second resistor is electrically connected with the non-inverting input end of the operational amplifier;
The other end of the second resistor is electrically connected with one end of the second capacitor;
The other end of the second capacitor is grounded;
the output end of the operational amplifier is electrically connected with the inverting input end of the output end of the operational amplifier;
The output end of the operational amplifier is electrically connected with one end of the third resistor, and the other end of the third resistor is used as the output end of the low-pass filter circuit.
3. the CVT secondary side remote monitoring device according to claim 1 or 2, characterized in that the CVT secondary side data real-time analysis storage device further comprises a housing, the acquisition module, the microprocessor chip, the low pass filter circuit, the voltage transformation module, the first data memory and the second data memory are all arranged on the inner side of the housing, and the input port of the low pass filter circuit is arranged on the outer side of the housing; the display module is arranged on the outer side of the shell.
4. the CVT secondary side remote monitoring device according to claim 3, wherein the housing comprises a base, the base is provided with bolt holes, and the CVT secondary side data real-time analysis storage device is fixedly arranged on the CVT equipment through the bolts, the nuts and the bolt holes.
5. the CVT secondary side remote monitoring device of claim 1, 2 or 4 further including a wireless communication module electrically connected to the microprocessor chip.
6. the CVT secondary side remote monitoring device according to claim 5, wherein the wireless communication module comprises a 4G communication module, and an input end of the 4G communication module is connected to the fourth output end of the microprocessor chip.
7. the CVT secondary side remote monitoring device according to claim 6, wherein the wireless communication module comprises a WIFI module, an input end of the WIFI module is connected to a fifth output end of the microprocessor chip; a plurality of CVT secondary side remote real-time monitoring devices form a local area network through a WIFI module.
8. The CVT secondary side remote monitoring device according to claim 6 or 7, characterized in that the CVT secondary side data real-time analysis storage device further comprises a standby power supply, and the standby power supply is used for sending power-off information through the 4G communication module by the micro-processing chip under the condition of power-off.
9. The CVT secondary side remote monitoring device according to claim 8, wherein the CVT secondary side data real-time analysis and storage device further comprises a power supply circuit, the power supply circuit is directly connected to a mains socket, and the power supply circuit further charges a backup power supply.
10. The CVT secondary side remote monitoring device of claim 1, 2, 4, 6, 7 or 9 further including a fuse, wherein,
One end of the protective tube is electrically connected with the input end of the low-pass filter circuit;
the other end of the protective tube is electrically connected with the input end of the voltage transformation module.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201810525726.5A CN110542784A (en) | 2018-05-28 | 2018-05-28 | CVT secondary side remote monitoring device |
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| CN201810525726.5A CN110542784A (en) | 2018-05-28 | 2018-05-28 | CVT secondary side remote monitoring device |
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| CN110542784A true CN110542784A (en) | 2019-12-06 |
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| CN201810525726.5A Pending CN110542784A (en) | 2018-05-28 | 2018-05-28 | CVT secondary side remote monitoring device |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112327034A (en) * | 2020-09-29 | 2021-02-05 | 国网山东省电力公司冠县供电公司 | Voltage stability monitoring method |
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-
2018
- 2018-05-28 CN CN201810525726.5A patent/CN110542784A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102129763A (en) * | 2011-01-10 | 2011-07-20 | 北京交通大学 | CVT (Capacitor Voltage Transformer) online monitoring system |
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