CN104808049A - Portable transformer neutral point current monitoring device - Google Patents
Portable transformer neutral point current monitoring device Download PDFInfo
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- CN104808049A CN104808049A CN201510239155.5A CN201510239155A CN104808049A CN 104808049 A CN104808049 A CN 104808049A CN 201510239155 A CN201510239155 A CN 201510239155A CN 104808049 A CN104808049 A CN 104808049A
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- neutral point
- transformer neutral
- point current
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Abstract
The invention provides a portable transformer neutral point current monitoring device, which comprises a power source module, a signal collection module, a data processing module, a storage module and a liquid crystal display module, wherein the signal collection module is unidirectionally connected with the data processing module; the data processing module is bidirectionally connected with the storage module and is unidirectionally connected with the display module; the power source module is bidirectionally connected with the signal collection module, the data processing module, the storage module and the liquid crystal display module. The invention provides the portable transformer neutral point current monitoring device, a direct current magnetic bias condition of a power transformer in a grid can be used for commonly measuring, effective values of direct current, alternating current and total current of an earthing wire at a power transformer neutral point can be measured, and an early warning signal can be provided for a fault condition of the system.
Description
Technical field
The present invention relates to a kind of monitoring device, be specifically related to a kind of portable transformer neutral point current monitoring device.
Background technology
The electric network composition of AC and DC mixed running make between AC and DC system influence each other also all the more obvious.When DC transmission system one pole ground connection or bipolar off-center operation, DC current will inject the earth by earthing pole, in ground, DC current invades AC system by transformer neutral point ground wire, has an impact to AC system, and wherein impact is exactly cause transformer DC magnetic bias phenomenon the most significantly.Make magnetization curve unshakable in one's determination asymmetric, aggravation iron core cutter, causes transformer noise to increase, can cause the overheated of the places such as transformer core, bolt, shell, even cause transformer damage.
Because DC magnetic bias current exists close correlation to the harm of transformer and size of current, for grasping DC magnetic bias current in the regularity of distribution of AC system and transformer degree of susceptibility, be necessary to monitor DC magnetic bias current.
Summary of the invention
In order to overcome above-mentioned the deficiencies in the prior art, the invention provides a kind of portable transformer neutral point current monitoring device, general survey can be carried out to the DC magnetic biasing situation of power transformer in electrical network, simultaneously can DC current, alternating current and total current effective value on Monitoring Power Transformer neutral ground line, and provide early warning signal for the failure condition in system.
In order to realize foregoing invention object, the present invention takes following technical scheme:
This law provides a kind of portable transformer neutral point current monitoring device, it is characterized in that: described monitoring device comprises power module, signal acquisition module, data processing module, memory module and LCD MODULE; Described signal acquisition module is connected with data processing module is unidirectional, described data processing module and memory module are bi-directionally connected, and be connected with LCD MODULE is unidirectional, described power module and signal acquisition module, data processing module, memory module, LCD MODULE are all bi-directionally connected.
Described power module comprises solar panel, charge control module, accumulator and DC-DC converter; Described charge control module receives the electric energy coming from solar panel, and accumulator is charged, the DC voltage that accumulator exports is converted into the rated operational voltage of other modules in described monitoring device by described DC-DC converter, is other module for power supply.
Described charge control module is charged to accumulator according to the corresponding charging modes of the condition selecting of accumulator, and charging modes comprises trickle charge, constant-current charge, constant-voltage charge and floating charge.
Described signal acquisition module adopts dismountable current sensor, and described dismountable current sensor is Hall type current sensor.
Power transformer neutral point current is converted to voltage signal corresponding with it by described signal acquisition module, and voltage signal is sent to described data processing module.
Described data processing module comprises signal pre processing circuit, band A/D changes microprocessor, data transmission interface circuit and time reference circuit.
Described signal pre processing circuit receives the voltage signal from signal acquisition module, and after carrying out pre-treatment to the voltage signal received, exports the voltage signal proportional with power transformer neutral point current effective value; Described pretreatment process comprises amplification, filtering and zero point correction.
Described microprocessor carries out A/D conversion to the voltage signal that signal pre processing circuit exports, and the digital signal be converted to is processed, obtain the power transformer neutral point current with digital representation, this electric current passes through data transmission interface circuit transmission to monitor supervision platform.
The power transformer neutral point current obtained through microprocessor processes is shown by described LCD MODULE, and the time reference circuit in described data processing module provides corresponding Measuring Time information for the power transformer neutral point current obtained through microprocessor processes.
Described memory module adopts nonvolatile memory; The power transformer neutral point current that microprocessor processes obtains and corresponding Measuring Time information are stored in nonvolatile memory.
Compared with prior art, beneficial effect of the present invention is:
1. can realize monitoring DC component, AC compounent and the total current on power transformer neutral ground line;
2. adopt solar panel and accumulator to be that monitoring device is powered, without the need to using power-supply system in transformer station;
3. adopt dismountable current sensor can reduce the necessary technical approval of in-site installation, and dismountable current sensor can be sleeved on transformer neutral point ground wire when not having a power failure, when not dismantling transformer neutral point ground wire;
4., for ensureing measuring accuracy, adopt high linearity Hall current sensor, to guarantee the linearity of test signal;
5. adopt gamut calibrating mode during calibration, ensure that high measuring accuracy;
6. adopt absolute time information to produce integrated circuit, for power transformer neutral point current provides Measuring Time information;
7. charge control module is for providing interface between solar panel and accumulator, controls the charging of accumulator and the course of work;
8. power transformer neutral point current directly can enter monitor supervision platform by data transmission interface circuit, in monitor supervision platform, carry out multianalysis to power transformer neutral point current;
9. volume normal operation that is little, easy for installation, not influential system, and Monitoring Data can be shown in real time, this device can be used as the powerful of transformer neutral line point current conditions generaI investigation in operation.
Accompanying drawing explanation
Fig. 1 is portable transformer neutral point current monitoring device structural drawing in the embodiment of the present invention.
Embodiment
Below in conjunction with accompanying drawing, the present invention is described in further detail.
As Fig. 1, this law provides a kind of portable transformer neutral point current monitoring device, it is characterized in that: described monitoring device comprises power module, signal acquisition module, data processing module, memory module and LCD MODULE; Described signal acquisition module is connected with data processing module is unidirectional, described data processing module and memory module are bi-directionally connected, and be connected with LCD MODULE is unidirectional, described power module and signal acquisition module, data processing module, memory module, LCD MODULE are all bi-directionally connected.
Described power module comprises solar panel, charge control module, accumulator and DC-DC converter; Described charge control module receives the electric energy coming from solar panel, and accumulator is charged, the DC voltage that accumulator exports is converted into the rated operational voltage of other modules in described monitoring device by described DC-DC converter, is other module for power supply.
Described charge control module is charged to accumulator according to the corresponding charging modes of the condition selecting of accumulator, and charging modes comprises trickle charge, constant-current charge, constant-voltage charge and floating charge.
Described signal acquisition module adopts dismountable current sensor, and described dismountable current sensor is Hall type current sensor.
Power transformer neutral point current is converted to voltage signal corresponding with it by described signal acquisition module, and voltage signal is sent to described data processing module.
Described data processing module comprises signal pre processing circuit, band A/D changes microprocessor, data transmission interface circuit and time reference circuit.
Described signal pre processing circuit receives the voltage signal from signal acquisition module, and after carrying out pre-treatment to the voltage signal received, exports the voltage signal proportional with power transformer neutral point current effective value; Described pretreatment process comprises amplification, filtering and zero point correction.
Described microprocessor carries out A/D conversion to the voltage signal that signal pre processing circuit exports, and the digital signal be converted to is processed, obtain the power transformer neutral point current with digital representation, this electric current passes through data transmission interface circuit transmission to monitor supervision platform.
The power transformer neutral point current obtained through microprocessor processes is shown by described LCD MODULE, and the time reference circuit in described data processing module provides corresponding Measuring Time information for the power transformer neutral point current obtained through microprocessor processes.
Described memory module adopts nonvolatile memory; The power transformer neutral point current that microprocessor processes obtains and corresponding Measuring Time information are stored in nonvolatile memory.
Finally should be noted that: above embodiment is only in order to illustrate that technical scheme of the present invention is not intended to limit; those of ordinary skill in the field still can modify to the specific embodiment of the present invention with reference to above-described embodiment or equivalent replacement; these do not depart from any amendment of spirit and scope of the invention or equivalent replacement, are all applying within the claims of the present invention awaited the reply.
Claims (10)
1. a portable transformer neutral point current monitoring device, is characterized in that: described monitoring device comprises power module, signal acquisition module, data processing module, memory module and LCD MODULE; Described signal acquisition module is connected with data processing module is unidirectional, described data processing module and memory module are bi-directionally connected, and be connected with LCD MODULE is unidirectional, described power module and signal acquisition module, data processing module, memory module, LCD MODULE are all bi-directionally connected.
2. portable transformer neutral point current monitoring device according to claim 1, is characterized in that: described power module comprises solar panel, charge control module, accumulator and DC-DC converter; Described charge control module receives the electric energy coming from solar panel, and accumulator is charged, the DC voltage that accumulator exports is converted into the rated operational voltage of other modules in described monitoring device by described DC-DC converter, is other module for power supply.
3. portable transformer neutral point current monitoring device according to claim 2, it is characterized in that: described charge control module is charged to accumulator according to the corresponding charging modes of the condition selecting of accumulator, and charging modes comprises trickle charge, constant-current charge, constant-voltage charge and floating charge.
4. portable transformer neutral point current monitoring device according to claim 1, is characterized in that: described signal acquisition module adopts dismountable current sensor, and described dismountable current sensor is Hall type current sensor.
5. the portable transformer neutral point current monitoring device according to claim 1 or 4, it is characterized in that: power transformer neutral point current is converted to voltage signal corresponding with it by described signal acquisition module, and voltage signal is sent to described data processing module.
6. portable transformer neutral point current monitoring device according to claim 1, is characterized in that: described data processing module comprises signal pre processing circuit, band A/D changes microprocessor, data transmission interface circuit and time reference circuit.
7. portable transformer neutral point current monitoring device according to claim 6, it is characterized in that: described signal pre processing circuit receives the voltage signal from signal acquisition module, and after pre-treatment is carried out to the voltage signal received, export the voltage signal proportional with power transformer neutral point current effective value; Described pretreatment process comprises amplification, filtering and zero point correction.
8. the portable transformer neutral point current monitoring device according to claim 6 or 7, it is characterized in that: described microprocessor carries out A/D conversion to the voltage signal that signal pre processing circuit exports, and the digital signal be converted to is processed, obtain the power transformer neutral point current with digital representation, this electric current passes through data transmission interface circuit transmission to monitor supervision platform.
9. portable transformer neutral point current monitoring device according to claim 8, it is characterized in that: the power transformer neutral point current obtained through microprocessor processes is shown by described LCD MODULE, the time reference circuit in described data processing module provides corresponding Measuring Time information for the power transformer neutral point current obtained through microprocessor processes.
10. portable transformer neutral point current monitoring device according to claim 8, is characterized in that: described memory module adopts nonvolatile memory; The power transformer neutral point current that microprocessor processes obtains and corresponding Measuring Time information are stored in nonvolatile memory.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510239155.5A CN104808049A (en) | 2015-05-12 | 2015-05-12 | Portable transformer neutral point current monitoring device |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510239155.5A CN104808049A (en) | 2015-05-12 | 2015-05-12 | Portable transformer neutral point current monitoring device |
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| CN104808049A true CN104808049A (en) | 2015-07-29 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201510239155.5A Pending CN104808049A (en) | 2015-05-12 | 2015-05-12 | Portable transformer neutral point current monitoring device |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN105353200A (en) * | 2015-12-10 | 2016-02-24 | 国网四川省电力公司电力科学研究院 | On-line monitoring system for DC magnetic bias current of transformer |
| CN108828379A (en) * | 2018-09-11 | 2018-11-16 | 国网新疆电力有限公司电力科学研究院 | Zeroing and the high transformer neutral point monitor of calibration accuracy |
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| CN102520240A (en) * | 2012-01-05 | 2012-06-27 | 山东电力研究院 | Magnetic bias current monitoring and early-warning system for large-scale transformer |
| CN202333893U (en) * | 2011-11-26 | 2012-07-11 | 中国华录集团有限公司 | Charger for solar energy portable equipment |
| CN103197178A (en) * | 2013-03-21 | 2013-07-10 | 辽宁省电力有限公司电力科学研究院 | Device and method of on-line monitoring of transformer direct current magnetic bias |
| CN104076260A (en) * | 2014-07-16 | 2014-10-01 | 胡小青 | High-accuracy equipment for detecting pollution flashover of insulator |
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| CN201527460U (en) * | 2009-09-28 | 2010-07-14 | 泉州科力电气有限公司 | Distribution feeder fault locating terminal unit |
| CN101963639A (en) * | 2010-09-25 | 2011-02-02 | 天津工业大学 | Monitoring system of power transformer |
| CN202333893U (en) * | 2011-11-26 | 2012-07-11 | 中国华录集团有限公司 | Charger for solar energy portable equipment |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN105353200A (en) * | 2015-12-10 | 2016-02-24 | 国网四川省电力公司电力科学研究院 | On-line monitoring system for DC magnetic bias current of transformer |
| CN108828379A (en) * | 2018-09-11 | 2018-11-16 | 国网新疆电力有限公司电力科学研究院 | Zeroing and the high transformer neutral point monitor of calibration accuracy |
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Inventor after: Li Jinzhong Inventor after: Liu Xueli Inventor after: Wu Chao Inventor after: Yu Xinru Inventor after: Wang Ke Inventor after: Wei Xinlao Inventor after: Sun Jiantao Inventor after: Wang Yonghong Inventor after: Zhang Shuqi Inventor after: Chen Qingguo Inventor after: Chou Yuzhou Inventor after: Cheng Huanchao Inventor after: Gao Fei Inventor before: Li Jinzhong Inventor before: Liu Xueli Inventor before: Wu Chao Inventor before: Yu Xinru Inventor before: Wang Ke Inventor before: Wei Xinlao Inventor before: Sun Jiantao Inventor before: Wang Yonghong Inventor before: Zhang Shuqi Inventor before: Chen Qingguo Inventor before: Chou Xuezhou Inventor before: Cheng Huanchao Inventor before: Gao Fei |
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Application publication date: 20150729 |