CN110542780A - Chargeable CVT voltage live monitoring device - Google Patents
Chargeable CVT voltage live monitoring device Download PDFInfo
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- CN110542780A CN110542780A CN201810523756.2A CN201810523756A CN110542780A CN 110542780 A CN110542780 A CN 110542780A CN 201810523756 A CN201810523756 A CN 201810523756A CN 110542780 A CN110542780 A CN 110542780A
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- 238000012806 monitoring device Methods 0.000 title claims abstract description 24
- 238000012545 processing Methods 0.000 claims abstract description 17
- 230000009466 transformation Effects 0.000 claims abstract description 14
- 238000004891 communication Methods 0.000 claims description 17
- 230000001681 protective effect Effects 0.000 claims description 11
- 230000003321 amplification Effects 0.000 claims description 5
- 238000003199 nucleic acid amplification method Methods 0.000 claims description 5
- 238000004458 analytical method Methods 0.000 abstract description 7
- 239000003990 capacitor Substances 0.000 description 14
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 description 6
- 229910052744 lithium Inorganic materials 0.000 description 6
- 238000012544 monitoring process Methods 0.000 description 6
- 238000012360 testing method Methods 0.000 description 4
- 230000001052 transient effect Effects 0.000 description 3
- 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
- 230000002159 abnormal effect Effects 0.000 description 1
- 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
- 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
Classifications
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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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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Measurement Of Current Or Voltage (AREA)
Abstract
the invention discloses a chargeable CVT voltage live monitoring device, which comprises a micro-processing chip, a low-pass filter circuit, a voltage transformation module, a display module, a mobile power supply and a charging circuit, 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 mobile power supply provides a power supply function; the charging circuit is controlled by the micro-processing chip, and the output end of the charging circuit is electrically connected with the input end of the mobile power supply. 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 rechargeable CVT voltage electrification 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 real-time 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 chargeable CVT voltage electrification monitoring device comprises a microprocessor chip, a low-pass filter circuit, a voltage transformation module, a display module, a mobile power supply and a charging circuit, 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 mobile power supply provides a power supply function;
the charging circuit is controlled by the micro-processing chip, and the output end of the charging circuit is electrically connected with the input end of the mobile power supply.
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.
in a preferred scheme, the CVT voltage live-line monitoring device further comprises an LDO power chip, and an input end of the LDO power chip is electrically connected with an output end of the mobile power supply; and the output end of the LDO power supply chip is electrically connected with the second input end of the micro-processing chip.
in the preferred embodiment, since the electric quantity of the mobile power supply and the output voltage thereof have a certain relationship and can be approximately considered as a linear relationship in a limited range, the voltage of the mobile power supply can be tested by the microprocessor chip according to the relationship, so that the electric quantity of the battery can be judged.
in a preferred scheme, the charging circuit comprises a voltage amplifying circuit, a relay and a power supply adapting unit, wherein,
the input end of the voltage amplifying circuit is used as the control end of the charging circuit, and the input end of the voltage amplifying circuit is electrically connected with the second output end of the micro-processing chip;
The output end of the voltage amplifying circuit is electrically connected with the control end of the relay;
The switch side of the relay is arranged between the power supply adapting unit and the mobile power supply;
the input end of the power supply adapting unit is connected to a commercial power socket;
the output end of the power supply adapting unit is connected with one end of the switch side of the relay;
And the other end of the switch side of the relay is used as the output end of the charging circuit.
In this preferred scheme, when portable power source electric quantity is not enough, the high level signal of microprocessor chip output steps up through voltage amplification circuit, drives relay on-off side, realizes charging portable power source.
in a preferred scheme, the CVT voltage live-line monitoring device further comprises a housing, the microprocessor chip, the low-pass filter circuit, the voltage transformation module, the LDO power supply chip and the mobile power supply 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 input port of the charging circuit is arranged on the outer side of the shell; the display module is arranged on the outer side of the shell.
In a preferred embodiment, the housing includes a base, the base is provided with a bolt hole, and the CVT voltage electrification monitoring device is fixedly arranged on the CVT equipment through the bolt, the nut and the bolt hole.
in a preferred embodiment, the CVT voltage electrification monitoring 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.
The CVT secondary side remote monitoring device also comprises a protective tube, 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.
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 embodiment, the CVT voltage electrification monitoring device further comprises a GPS module, and an output end of the GPS module is electrically connected to the third input end of the microprocessor chip.
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 4G communication module, a 8873130 lithium battery, a relay, a power adapter unit, a voltage amplification circuit, an LDO power chip, 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;
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 end of the enhanced STM32 chip is electrically connected with an input end of a second TF card;
the input end of the voltage amplification circuit is electrically connected with the sixth output end of the enhancement type STM32 chip;
The output end of the voltage amplifying circuit is electrically connected with the control end of the relay;
the switch side of the relay is arranged between the power supply adapting unit and the 8873130 lithium battery;
The input end of the power supply adapting unit is connected to a commercial power socket;
the output end of the power supply adapting unit is connected with one end of the switch side of the relay;
The other end of the switch side of the relay is electrically connected with the input end of the 8873130 lithium battery;
8873130 the output end of the lithium battery is electrically connected with the input end of the LDO power chip;
and the output end of the LDO power supply chip is electrically connected with the second input end of the enhanced STM32 chip.
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. Secondly, when 8873130 lithium cell electric quantity is not enough, enhancement mode STM32 chip output high level signal steps up through voltage amplification circuit, drives the relay on-off side, realizes the charging to 8873130 lithium cell.
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 (9)
1. A chargeable CVT voltage electrification monitoring device is characterized by comprising a microprocessor chip, a low-pass filter circuit, a voltage transformation module, a display module, a mobile power supply and a charging circuit, 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 mobile power supply provides a power supply function;
the charging circuit is controlled by the micro-processing chip, and the output end of the charging circuit is electrically connected with the input end of the mobile power supply.
2. the CVT voltage charging monitoring device according to claim 1, further comprising an LDO power chip, wherein an input of the LDO power chip is electrically connected to an output of the mobile power supply; and the output end of the LDO power supply chip is electrically connected with the second input end of the micro-processing chip.
3. The CVT voltage presence monitor according to claim 2, wherein said charging circuit includes a voltage amplification circuit, a relay, a power adapter unit, wherein,
The input end of the voltage amplifying circuit is used as the control end of the charging circuit, and the input end of the voltage amplifying circuit is electrically connected with the second output end of the micro-processing chip;
The output end of the voltage amplifying circuit is electrically connected with the control end of the relay;
the switch side of the relay is arranged between the power supply adapting unit and the mobile power supply;
the input end of the power supply adapting unit is connected to a commercial power socket;
the output end of the power supply adapting unit is connected with one end of the switch side of the relay;
And the other end of the switch side of the relay is used as the output end of the charging circuit.
4. The CVT voltage presence monitoring device according to any one of claims 1 to 3, characterized in that the CVT voltage presence monitoring device further comprises a housing, the microprocessor chip, the low pass filter circuit, the voltage transformation module, the LDO power chip and the mobile power supply are all disposed inside the housing, and the input port of the low pass filter circuit is disposed outside the housing; the input port of the charging circuit is arranged on the outer side of the shell; the display module is arranged on the outer side of the shell.
5. The CVT voltage presence monitor device of claim 4, wherein said housing includes a base, said base having a bolt hole, said CVT voltage presence monitor device being fixedly attached to the CVT apparatus by means of a bolt, a nut and a bolt hole.
6. A CVT voltage electrification monitoring device according to claim 1, 2, 3 or 5 and further including a wireless communication module electrically connected to the microprocessor chip.
7. The CVT voltage electrification monitoring device of claim 6, wherein the wireless communication module includes a 4G communication module, and an input end of the 4G communication module is connected with a fourth output end of the micro-processing chip.
8. the CVT voltage electrification monitoring device of claim 7, wherein the wireless communication module includes a WIFI module, an input end of the WIFI module is connected with 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.
9. a CVT secondary side remote monitoring device according to claim 1, 2, 3, 5, 7 or 8 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 |
|---|---|---|---|
| CN201810523756.2A CN110542780A (en) | 2018-05-28 | 2018-05-28 | Chargeable CVT voltage live monitoring device |
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| CN201810523756.2A CN110542780A (en) | 2018-05-28 | 2018-05-28 | Chargeable CVT voltage live monitoring device |
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Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1549631A (en) * | 2003-05-15 | 2004-11-24 | ����������ͨѶ�ɷ�����˾�Ͼ��ֹ� | Encrypting and de-encrypting method for personal hand-held communication system cell phone identification information |
| CN102129763A (en) * | 2011-01-10 | 2011-07-20 | 北京交通大学 | CVT (Capacitor Voltage Transformer) online monitoring system |
| CN201936442U (en) * | 2011-02-25 | 2011-08-17 | 华北电力大学 | On-line monitoring system for capacitance voltage transformer |
| CN103454517A (en) * | 2013-06-26 | 2013-12-18 | 广东电网公司佛山供电局 | Method for online monitoring capacitive voltage transformers |
| CN203981862U (en) * | 2014-05-29 | 2014-12-03 | 国网山西省电力公司电力科学研究院 | Capacitance type potential transformer automated watch-keeping facility |
| CN206773171U (en) * | 2017-05-17 | 2017-12-19 | 广东电网有限责任公司佛山供电局 | A kind of capacitance type potential transformer real-time detection apparatus based on Android mobile phone platform |
| CN107607764A (en) * | 2017-05-17 | 2018-01-19 | 广东电网有限责任公司佛山供电局 | A kind of multichannel capacitance type potential transformer real-time detection method and device |
| CN207067378U (en) * | 2017-05-17 | 2018-03-02 | 广东电网有限责任公司佛山供电局 | A kind of capacitance type potential transformer real-time detection apparatus based on PC platforms |
-
2018
- 2018-05-28 CN CN201810523756.2A patent/CN110542780A/en active Pending
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1549631A (en) * | 2003-05-15 | 2004-11-24 | ����������ͨѶ�ɷ�����˾�Ͼ��ֹ� | Encrypting and de-encrypting method for personal hand-held communication system cell phone identification information |
| CN102129763A (en) * | 2011-01-10 | 2011-07-20 | 北京交通大学 | CVT (Capacitor Voltage Transformer) online monitoring system |
| CN201936442U (en) * | 2011-02-25 | 2011-08-17 | 华北电力大学 | On-line monitoring system for capacitance voltage transformer |
| CN103454517A (en) * | 2013-06-26 | 2013-12-18 | 广东电网公司佛山供电局 | Method for online monitoring capacitive voltage transformers |
| CN203981862U (en) * | 2014-05-29 | 2014-12-03 | 国网山西省电力公司电力科学研究院 | Capacitance type potential transformer automated watch-keeping facility |
| CN206773171U (en) * | 2017-05-17 | 2017-12-19 | 广东电网有限责任公司佛山供电局 | A kind of capacitance type potential transformer real-time detection apparatus based on Android mobile phone platform |
| CN107607764A (en) * | 2017-05-17 | 2018-01-19 | 广东电网有限责任公司佛山供电局 | A kind of multichannel capacitance type potential transformer real-time detection method and device |
| CN207067378U (en) * | 2017-05-17 | 2018-03-02 | 广东电网有限责任公司佛山供电局 | A kind of capacitance type potential transformer real-time detection apparatus based on PC platforms |
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Application publication date: 20191206 |