CN103956720A - Wireless transformer neutral point current monitoring device - Google Patents
Wireless transformer neutral point current monitoring device Download PDFInfo
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- CN103956720A CN103956720A CN201410200803.1A CN201410200803A CN103956720A CN 103956720 A CN103956720 A CN 103956720A CN 201410200803 A CN201410200803 A CN 201410200803A CN 103956720 A CN103956720 A CN 103956720A
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Abstract
The invention relates to a wireless transformer neutral point current monitoring device. The wireless transformer neutral point current monitoring device comprises a Hall sensor, a current processing unit and a wireless transmission unit, wherein the Hall sensor, the current processing unit and the wireless transmission unit are connected in sequence; the Hall sensor, the current processing unit and the wireless transmission unit are all encapsulated in a spherical shell, and the spherical shell is installed on a transformer. A current signal is sensed by the Hall sensor and transmitted to the current processing unit; processing including AD conversion, Fourier transformation and time correction processing is conducted on the received current signal by the current processing unit; the processed current signal is output by the wireless transmission unit according to the ZigBee PRO protocol and transmitted to an upper computer. Compared with the prior art, the wireless transformer neutral point current monitoring device has the advantages of being high in flexibility, convenient to install and the like.
Description
Technical field
The present invention relates to the monitoring technology of a kind of electric power system on-line monitoring and DC magnetic bias current, particularly a kind of transformer neutral point electric current wireless monitoring device.
Background technology
DC transmission system is in the situation that debugging, overhauling or break down, direct current transportation meeting adopts the operational mode of one pole ground return circuit, this will make the transformer in different DC potential form DC loop through transmission line, Transformer Winding, direct current, through transformer neutral point inflow transformer winding, causes transformer generation D.C. magnetic biasing.After transformer generation D.C. magnetic biasing, there will be noise to increase, the phenomenons such as vibration aggravation, serious also may cause that transformer is overheated, and causes the harmonic distortion of AC network to increase.
Neutral ground operating mode directly has influence on selection, the means of relay protection of system equipment insulation level, system overvoltage level, overvoltage protection element, operational reliability of system etc.One side is the operating mode of monitoring grounding resistance effectively, can provide basis for estimation for accident analysis on the other hand.
At present main transformer neutral ground current monitoring device adopts and lays telecommunication cable as signal transmission medium, but lay telecommunication cable in the ground connection ejectment of main transformer, on earth connection, on ground connection door frame, can bring hidden danger to the safe operation of primary equipment, maintenance repair.Therefore, in order to monitor transformer neutral point earth current, prevent transformer DC magnetic bias, reduce and lay the potential safety hazard that telecommunication cable brings, adopt a kind of transformer neutral point earth current wireless monitoring method based on ZigBee technology, can solve current device and adopt and lay telecommunication cable and carry out the potential safety hazard that transfer of data is brought.
ZigBee technology is a kind of short-distance wireless communication technology with uniform technical standards, is the low-power consumption territory fidonetFido based on IEEE802.15.4 standard, according to the technology of this agreement regulation, is the wireless communication technology of a kind of short distance, low-power consumption.ZigBee technology agreement layer is respectively physical layer (PHY), medium access layer (MAC), network layer (NWK), application layer (APL) etc. from top to bottom.Network layer is formulated by ZigBee alliance, and the Application and Development of application layer, according to user's application needs, develops and utilizes it, so this technology can provide motor-driven, networking mode flexibly for user.
Summary of the invention
Object of the present invention is exactly that a kind of easy for installation, transformer neutral point electric current wireless monitoring device that flexibility is strong is provided in order to overcome the defect that above-mentioned prior art exists.
Object of the present invention can be achieved through the following technical solutions:
A kind of transformer neutral point electric current wireless monitoring device, comprise the Hall element, current processing unit and the wireless transmission unit that connect successively, described Hall element, current processing unit and wireless transmission unit are all encapsulated in a spherical shell, and this spherical shell is arranged on transformer;
Hall element sensor current signal is transferred to current processing unit, current processing unit is processed the current signal receiving, comprise AD conversion, Fourier transform and time adjustment processing, wireless transmission unit is pressed ZigBeePRO agreement by the current signal output after processing, and is transferred to host computer.
Described current processing unit comprises DSP digital processing unit, microprocessor and timer, described microprocessor connects respectively DSP digital processing unit and timer, wherein, current signal is carried out to AD conversion with DSP digital processing unit and Fourier transform is processed, and microprocessor carries out time adjustment processing according to timer to current signal.
Described DSP digital processing unit is ADE7880 chip.
Described Hall element adopts lienar for Hall element, is fixed in spherical shell.
In a spherical shell, fix a Hall element.
Described spherical shell is fixed on the round conductor or rectangle busbar of transformer.
Described spherical shell is also provided with hardware watchdog chip, and this hardware watchdog chip is connected with microprocessor.
If transformer is three-phase integrated transformer, monitoring device is fixed on down conductor;
If transformer is three single-phase transformers, monitoring device is fixed on the earth connection between credit union's point and ground or is fixed on each single-phase transformer neutral lead between three-phase combination meeting point.
Compared with prior art, the present invention adopts ZigBee wireless communication module to carry out exchanges data through ISM2.4GHz DSSS (direct sequence spread spectrum) wireless channel and host computer, can avoid laying the potential safety hazard that telecommunication cable brings on electric power primary equipment, this device is easy for installation, and can obtain at different positions main transformer centre-point earth current information, therefore there is flexibility strong, convenient advantage of installing.
Accompanying drawing explanation
Fig. 1 is structural representation of the present invention;
Fig. 2 is a kind of scheme of installation of monitoring device of the present invention on transformer;
Fig. 3 is the another kind of scheme of installation of monitoring device of the present invention on transformer;
Fig. 4 is monitoring device of the present invention the third scheme of installation on transformer.
Embodiment
Below in conjunction with the drawings and specific embodiments, the present invention is described in detail.
As shown in Figure 1, a kind of transformer neutral point electric current wireless monitoring device, comprise the Hall element 3, current processing unit and the wireless transmission unit 7 that connect successively, described Hall element 3, current processing unit and wireless transmission unit 7 are all encapsulated in a spherical shell, and this spherical shell is arranged on transformer.
Described Hall element 3 adopts lienar for Hall element, is fixed in spherical shell, fixes a Hall element in a spherical shell, can measure direct current and alternating current, and sampled signal is analog signals.
Described spherical shell is fixed on the round conductor or rectangle busbar of transformer.If transformer is three-phase integrated transformer, monitoring device is fixed on down conductor, as shown in Figure 2; If transformer is three single-phase transformers, monitoring device is fixed on the earth connection between credit union's point and ground, as shown in Figure 3, or is fixed on each single-phase transformer neutral lead between three-phase combination meeting point, as shown in Figure 4.
Described current processing unit comprises DSP digital processing unit 2, microprocessor 4 and timer, and described microprocessor 4 connects respectively DSP digital processing unit 2 and timer, and DSP digital processing unit 2 adopts ADE7880 chip.Wherein, 2 pairs of current signals of DSP digital processing unit carry out AD conversion and Fourier transform is processed, and microprocessor 4 carries out time adjustment processing according to timer to current signal.DSP digital processing unit 2 receives the signal of Hall element 3 detections and carries out AD conversion and fast fourier transform processing, the effective value in picked up signal and each harmonic component value, and microprocessor (MCU) 4 reads the result of processing by SPI mouth.
In microprocessor 4, be provided with memory ROM5, preserve the program that microprocessor (MCU) needs operation, the relevant information such as correction parameter also leave in wherein, and its memory capacity can be 512M.
Microprocessor 4 receives the data after dsp chip is processed by SPI, according to data such as configuration information parameters, carries out data encoding, forms communication message, and by serial ports (UART1), communication message is delivered to wireless transmission unit 7.
Wireless transmission unit 7 is ZigBee telecommunication circuit, carry out communication with host computer, one end is connected on the UART1 (serial ports) of microprocessor (MCU), the other end connects antenna (2.4GHz frequency), and communicating circuit is responsible for the data in UART1 (serial ports) to send on the receiving equipment of far-end with wireless signal.
On microprocessor 4, be connected with a program and download (JTag) interface 6, as the online firmware program of device (BootLoad) maintenance function.
In this monitoring device, be provided with a power module 8, for generator power supply and power management.
Apparatus of the present invention are also provided with a hardware watchdog chip 1, and the level of on time sending variation by the IO mouth of microprocessor (MCU) 4 is to house dog.Once if device crashes, hardware watchdog can not receive corresponding level at the appointed time to be changed, and can provide reset signal to microprocessor (MCU), makes system can automatically recover normal.
In summary, it provides a kind of function of wireless measurement transformer neutral point earth current this device, solves and on transformer, lays the potential safety hazard that communication cable brings, and, easy construction flexible for installation with timer, ensured transformer safe and reliable operation.
Certainly, those skilled in the art in the art will be appreciated that, above-described embodiment is only for the present invention is described, and not as limitation of the invention, as long as within the scope of connotation of the present invention, the variation of above-described embodiment, modification etc. all will be dropped in the scope of the claims in the present invention.
Claims (8)
1. a transformer neutral point electric current wireless monitoring device, it is characterized in that, comprise the Hall element, current processing unit and the wireless transmission unit that connect successively, described Hall element, current processing unit and wireless transmission unit are all encapsulated in a spherical shell, and this spherical shell is arranged on transformer;
Hall element sensor current signal is transferred to current processing unit, current processing unit is processed the current signal receiving, comprise AD conversion, Fourier transform and time adjustment processing, wireless transmission unit is pressed ZigBeePRO agreement by the current signal output after processing, and is transferred to host computer.
2. a kind of transformer neutral point electric current wireless monitoring device according to claim 1, it is characterized in that, described current processing unit comprises DSP digital processing unit, microprocessor and timer, described microprocessor connects respectively DSP digital processing unit and timer, wherein, current signal is carried out to AD conversion with DSP digital processing unit and Fourier transform is processed, and microprocessor carries out time adjustment processing according to timer to current signal.
3. a kind of transformer neutral point electric current wireless monitoring device according to claim 2, is characterized in that, described DSP digital processing unit is ADE7880 chip.
4. a kind of transformer neutral point electric current wireless monitoring device according to claim 1, is characterized in that, described Hall element adopts lienar for Hall element, is fixed in spherical shell.
5. a kind of transformer neutral point electric current wireless monitoring device according to claim 4, is characterized in that, fixes a Hall element in a spherical shell.
6. a kind of transformer neutral point electric current wireless monitoring device according to claim 1, is characterized in that, described spherical shell is fixed on the round conductor or rectangle busbar of transformer.
7. a kind of transformer neutral point electric current wireless monitoring device according to claim 2, is characterized in that, described spherical shell is also provided with hardware watchdog chip, and this hardware watchdog chip is connected with microprocessor.
8. a kind of transformer neutral point electric current wireless monitoring device according to claim 1, is characterized in that, if transformer is three-phase integrated transformer, monitoring device is fixed on down conductor;
If transformer is three single-phase transformers, monitoring device is fixed on the earth connection between credit union's point and ground or is fixed on each single-phase transformer neutral lead between three-phase combination meeting point.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410200803.1A CN103956720A (en) | 2014-05-13 | 2014-05-13 | Wireless transformer neutral point current monitoring device |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410200803.1A CN103956720A (en) | 2014-05-13 | 2014-05-13 | Wireless transformer neutral point current monitoring device |
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| CN103956720A true CN103956720A (en) | 2014-07-30 |
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| CN201410200803.1A Pending CN103956720A (en) | 2014-05-13 | 2014-05-13 | Wireless transformer neutral point current monitoring device |
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20100305773A1 (en) * | 2007-12-26 | 2010-12-02 | Greenlet Technologies Ltd | Reducing power consumption in a network by detecting electrical signatures of appliances |
| CN202421318U (en) * | 2012-01-05 | 2012-09-05 | 山东电力研究院 | Large transformer bias current monitoring and early warning system |
| 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 |
-
2014
- 2014-05-13 CN CN201410200803.1A patent/CN103956720A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20100305773A1 (en) * | 2007-12-26 | 2010-12-02 | Greenlet Technologies Ltd | Reducing power consumption in a network by detecting electrical signatures of appliances |
| CN202421318U (en) * | 2012-01-05 | 2012-09-05 | 山东电力研究院 | Large transformer bias current monitoring and early warning system |
| 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 |
Non-Patent Citations (2)
| Title |
|---|
| 唐旸等: "基于AMI并采用DSP和zigbee的智能电表的设计", 《电子测试》, 31 May 2012 (2012-05-31) * |
| 完泾平等: "基于变压器中性点电流的在线监测***的研究", 《电力设备》, vol. 9, no. 11, 30 November 2008 (2008-11-30), pages 33 - 35 * |
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Application publication date: 20140730 |
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