CN103513082A - Electronic type mutual inductor with error on-line monitoring function - Google Patents
Electronic type mutual inductor with error on-line monitoring function Download PDFInfo
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- CN103513082A CN103513082A CN201310407622.1A CN201310407622A CN103513082A CN 103513082 A CN103513082 A CN 103513082A CN 201310407622 A CN201310407622 A CN 201310407622A CN 103513082 A CN103513082 A CN 103513082A
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Abstract
Provided is an electronic type mutual inductor with the error on-line monitoring function. The electronic type mutual inductor with the error on-line monitoring function is composed of an electronic type mutual inductor high-voltage side and an electronic type mutual inductor low-voltage side, signals output by a sensing head are connected to a signal conditioning circuit, signals output by the signal conditioning circuit are divided into two paths, one path of signals enter a digital acquisition circuit, the other path of signals enter a pulse conversion module, signals output by the digital acquisition circuit and signals output by the pulse conversion module are respectively connected to a photovoltaic conversion module, the photovoltaic conversion module outputs and sends digitals of sampling values generated by the digital acquisition circuit to a merging unit through an optical fiber and outputs pulse signals output by the pulse conversion module to the electronic type mutual inductor low-voltage side through an optical fiber. According to the electronic type mutual inductor, the angular difference of the electronic type mutual inductor can be monitored by comparing the optical pulse signals, and on-line monitoring of errors of the electronic type mutual inductor can be achieved conveniently.
Description
Technical field
The present invention relates to a kind of electronic mutual inductor with error on-line monitoring function, belong to electronic mutual inductor error on-line monitoring field.
Background technology
Electronic mutual inductor is one of digitizing in intelligent grid, intelligentized key equipment, reliability and stability due to electronic mutual inductor need perfect at present, cause electronic mutual inductor run time fault rate higher, become the bottleneck that it applies in electric system.In order to address this problem, must find out in actual moving process, which factor can be influential to the error characteristics of electronic mutual inductor, so many experts and scholars have carried out the error characteristics research of the operation conditions of electronic mutual inductor, as patent " with the electronic mutual inductor of on-line condition monitoring " (application number: 201020690017.1), propose the real-time online status monitoring to the nucleus equipment key position of electronic mutual inductor, comprised the important states such as electronic mutual inductor humiture, analog to digital conversion reference level, light mouth state; The Wang Huan of the Central China University of Science and Technology has also proposed electronic mutual inductor on-line monitoring system in Master's thesis " research of electronic mutual inductor on-line monitoring system " in addition, mainly the parameters such as electronic mutual inductor temperature, air pressure, dielectric loss is carried out to status monitoring.
But above-described monitoring variable is all some physical quantitys and quantity of state, follow the error of electronic mutual inductor to be difficult to set up direct relation, cannot really realize the error on-line monitoring of electronic mutual inductor.
Patent " optics and the real-time comparison method of electromagnetic current transducer kinematic error and device " (application number: 201210429190.x) proposed a kind of optics and the real-time comparison method of electromagnetic current transducer kinematic error and device, this device is by gathering the secondary output (IEC61850 signal) of optical current mutual inductor and the secondary singal of electromagnetic current transducer, then by algorithm, calculate error, this method can effectively obtain electronic mutual inductor Real-time Error, but need to gather electronic mutual inductor and electromagnetic transformer secondary singal, calculate, process, process more complicated, also can introduce extra error.
Summary of the invention
The object of the invention is: for the defect of prior art, the invention provides a kind of electronic mutual inductor with error on-line monitoring function, as a kind of electronic mutual inductor, it is converted to pulse signal by electronic technology by a measured sub-high pressure (large electric current) signal of electronic mutual inductor, by the comparison of the pulse signal between different electronic mutual inductors, observe its variable quantity, can realize the on-line monitoring of electronic mutual inductor angular difference, thereby provide a kind of new method for the error on-line monitoring of electronic mutual inductor.
The technical solution adopted in the present invention is: a kind of electronic mutual inductor with error on-line monitoring function, by electronic type transformer high voltage side and electronic mutual inductor low-pressure side two parts, formed, it is characterized in that, electronic type transformer high voltage side comprises sensing head, signal conditioning circuit, digital acquisition circuit, photoelectric conversion module, pulses switch module, and electronic mutual inductor low-pressure side comprises merge cells; The signal of sensing head output is connected to signal conditioning circuit; The signal of signal conditioning circuit output is divided into two-way one tunnel and enters digital acquisition circuit ，Yi road and enter pulses switch module; The signal of the signal of digital acquisition circuit output and the output of pulses switch module is connected to respectively photoelectric conversion module; Merge cells is delivered in the sampled value numeral output that photoelectric conversion module produces digital acquisition circuit by optical fiber; The output of pulse signal that photoelectric conversion module is exported pulses switch module by optical fiber is to electronic mutual inductor low-pressure side.
The electronic mutual inductor with error on-line monitoring function as above, is characterized in that, light pulse signal is to produce after signal conditioning circuit, and pulses switch module and digital acquisition circuit common source.
The electronic mutual inductor with error on-line monitoring function as above, is characterized in that, electronic mutual inductor is exported with light pulse, and its rising edge of a pulse is consistent with the zero cross signal of a high-voltage signal with negative edge.
The invention has the beneficial effects as follows: the present invention proposes a kind of electronic mutual inductor with light pulse output, this light pulse signal is relevant to a sub-high pressure (large electric current) zero crossing, by comparing light pulse signal, just monitor out the angular difference of electronic mutual inductor, realized easily the on-line monitoring of electronic mutual inductor error.
Accompanying drawing explanation
Fig. 1 is principle of work block diagram of the present invention.
Fig. 2 is embodiment of the present invention principle of work block diagram.
Fig. 3 is the graph of a relation between pulse output and a signal in the present invention.
Embodiment
In order to understand better the present invention, below in conjunction with embodiment, further illustrate content of the present invention, but content of the present invention is not only confined to the following examples.Those skilled in the art can make various changes or modifications the present invention, and these equivalent form of values are equally within the listed claims limited range of the application.
Description of symbols in accompanying drawing: 1-electronic type transformer high voltage side, 2-sensing head, 3-signal conditioning circuit, 4-digital acquisition circuit, 5-photoelectric conversion module, 6-pulses switch module, 7-merge cells, 8-electronic mutual inductor low-pressure side, the output of 9-sampled value numeral, the output of 10-zero-crossing pulse signal, 11-IEC61850 digital frame.
A kind of electronic mutual inductor with error on-line monitoring function provided by the invention, as a kind of electronic mutual inductor, it is converted to pulse signal by electronic technology by a measured sub-high pressure (large electric current) signal of electronic mutual inductor, the rising edge of pulse signal and negative edge are corresponding with the zero crossing of a sub-high pressure (large electric current), if electronic mutual inductor angular difference is zero, the phase differential between the zero crossing of pulse signal and a sub-high pressure (large electric current) signal is also zero, it is the angular difference that phase relation between the zero crossing of pulse signal and a sub-high pressure (large electric current) can reflect electronic mutual inductor.
Owing to affecting the key component of electronic mutual inductor error, be on high-tension side electronic circuit, under actual operating mode, be subject to ambient temperature, humidity, the factor impacts such as electromagnetic field, the running status of electronic circuit can change, and causes electronic mutual inductor unstable properties.Pulse signal above-mentioned only produces after signal conditioning circuit, and pulse switching circuit and digital acquisition circuit common source, under normal circumstances, if it is stable that the running status of electronic circuit keeps, the phase relation between the zero crossing of pulse signal and a sub-high pressure (large electric current) should be stable.If the running status of electronic circuit changes, phase relation between the two also can change.
By the comparison of the pulse signal between different electronic mutual inductors, observe its variable quantity like this, can realize the on-line monitoring of electronic mutual inductor angular difference, thereby provide a kind of new method for the error on-line monitoring of electronic mutual inductor.
As shown in Figure 1, the electronic mutual inductor with error on-line monitoring function of the present invention comprises electronic type transformer high voltage side 1, sensing head 2, signal conditioning circuit 3, digital acquisition circuit 4, photoelectric conversion module 5, pulses switch module 6, merge cells 7, electronic mutual inductor low-pressure side 8.
This electronic mutual inductor with error on-line monitoring function is comprised of electronic type transformer high voltage side 1 and electronic mutual inductor low-pressure side 8 two parts.In electronic type transformer high voltage side 1, the signal of sensing head 2 outputs is connected to signal conditioning circuit 3; The signal of signal conditioning circuit 3 output is divided into two-way one tunnel and enters digital acquisition circuit 4 ，Yi roads and enter pulses switch module 6; The signal of digital acquisition circuit 4 output signals and 6 outputs of pulses switch module is connected to respectively photoelectric conversion module 5; Merge cells 7 is delivered in the sampled value numeral output that photoelectric conversion module 5 produces digital acquisition circuit 4 by optical fiber; The output of pulse signal that photoelectric conversion module 5 is exported pulses switch module 6 by optical fiber is to electronic mutual inductor low-pressure side 8.
Pulses switch module 6 and digital acquisition circuit 4 common sources wherein; Phase differential between its rising edge of pulse signal of pulses switch module 6 outputs and a sub-high pressure (large electric current) signal zero crossing is no more than 10 minutes.
This has the electronic mutual inductor of error on-line monitoring function, its principle of work is: high-pressure side part is converted to small-signal by a measured sub-high pressure (large electric current) signal of electronic mutual inductor by sensing head, then by signal condition, be converted into the sine voltage signal that is applicable to measurement, again this signal is transferred to digital acquisition circuit and be converted to digital signal, pass through pulse switching circuit simultaneously, sine voltage signal is transformed to pulse signal, finally by photoelectric switching circuit, digital signal and pulse signal are converted to light signal and arrive low-pressure side by Optical Fiber Transmission.It is characterized in that:
1, electronic mutual inductor is exported with light pulse, and its rising edge of a pulse is consistent with the zero cross signal of a sub-high pressure (large electric current) signal with negative edge;
2, light pulse signal is to produce after signal conditioning circuit, and pulse switching circuit and digital acquisition circuit common source.
During concrete enforcement, as shown in Figure 2, two electronic mutual inductors are installed on same bus, the sensing head of every electronic mutual inductor is converted into weak electric signal by a sub-high pressure (large electric current), then by signal condition, be converted into the sine voltage signal that is applicable to measurement, again this signal is transferred to digital acquisition circuit and be converted to digital signal, pass through pulse switching circuit simultaneously, sine voltage signal is transformed to pulse signal, finally by photoelectric switching circuit, digital signal and pulse signal is converted to light signal and arrives low-pressure side by Optical Fiber Transmission.The phase differential that phasometer is measured between two pulse signals can obtain two phase errors between electronic mutual inductor
.If two mutual inductors are all stable,
should be a stable value, if
significant change has occurred, and explanation wherein has at least a mutual inductor running status to occur problem, needs to be serviced maintenance, has so just realized easily the error on-line monitoring of electronic mutual inductor.
On different buses, also can further extend application, if in actual transformer station, an electronic mutual inductor is only housed on same bus, can use the not mutual inductor between homophase to compare.Such as the pulse signal between A phase and B phase mutual inductor is compared, if because generally substation operation mode does not change, the current-voltage correlation between each phase is a stationary value.So the comparer pulse signal of phase differential can to(for) out of phase electronic mutual inductor
if substation operation mode does not change, and
variation has occurred, and it is undesired that explanation has electronic mutual inductor operation.
The content not being described in detail in this instructions belongs to the known prior art of professional and technical personnel in the field.
Claims (3)
1. an electronic mutual inductor with error on-line monitoring function, by electronic type transformer high voltage side and electronic mutual inductor low-pressure side two parts, formed, it is characterized in that, electronic type transformer high voltage side comprises sensing head, signal conditioning circuit, digital acquisition circuit, photoelectric conversion module, pulses switch module, and electronic mutual inductor low-pressure side comprises merge cells; The signal of sensing head output is connected to signal conditioning circuit; The signal of signal conditioning circuit output is divided into two-way one tunnel and enters digital acquisition circuit ，Yi road and enter pulses switch module; The signal of the signal of digital acquisition circuit output and the output of pulses switch module is connected to respectively photoelectric conversion module; Merge cells is delivered in the sampled value numeral output that photoelectric conversion module produces digital acquisition circuit by optical fiber; The output of pulse signal that photoelectric conversion module is exported pulses switch module by optical fiber is to electronic mutual inductor low-pressure side.
2. the electronic mutual inductor with error on-line monitoring function according to claim 1, is characterized in that, light pulse signal is to produce after signal conditioning circuit, and pulses switch module and digital acquisition circuit common source.
3. the electronic mutual inductor with error on-line monitoring function according to claim 1, is characterized in that, electronic mutual inductor is exported with light pulse, and its rising edge of a pulse is consistent with the zero cross signal of a high-voltage signal with negative edge.
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| CN104502663A (en) * | 2014-12-15 | 2015-04-08 | 北京世维通科技发展有限公司 | Optical-fiber current transformer device |
| CN106526308A (en) * | 2016-07-01 | 2017-03-22 | 南京新联电力自动化有限公司 | 10kV distribution network high-voltage metering device based on electronic-type sensor |
| CN109814060A (en) * | 2019-01-03 | 2019-05-28 | 广西电网有限责任公司贵港供电局 | The verification system and its method of more high-tension current inductors |
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| CN109814060A (en) * | 2019-01-03 | 2019-05-28 | 广西电网有限责任公司贵港供电局 | The verification system and its method of more high-tension current inductors |
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